/* ══════════════════════════════════════════════════════════════
   LeafTutor — app.css
   Component styles. Light theme, neutral surfaces + blue accent
   (LobeChat-inspired). All colors/radii/shadows come from
   tokens.css (--lt-*). Loaded after tokens.css.
   ══════════════════════════════════════════════════════════════ */

/* Alpine.js: hide elements with x-cloak until Alpine has initialized, so
   un-evaluated x-for / x-show markup doesn't flash before hydration. */
[x-cloak] { display: none !important; }

/* ─────────────────── 1. Legacy aliases → tokens ─────────────────
   Older rules (and the verbatim-moved blocks in §19–20) reference
   these names. Map them onto the token system so they recolor too.
   (Layout dimensions --nav-h/--g/--handle-w/--rail-gap live in tokens.css.) */
:root {
  --card:        var(--lt-bg-container);
  --muted:       var(--lt-text-tertiary);
  --green:       var(--lt-primary);
  --green-dark:  var(--lt-primary-active);
  --mint:        var(--lt-primary-border);
  --danger:      var(--lt-error);
  --border-soft: var(--lt-border-secondary);
}

/* ─────────────────── 2. Reset + Base ───────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html, body { height: 100%; overflow: hidden; }

body {
  margin: 0;
  font-family: var(--lt-font);
  font-size: var(--lt-fz);
  line-height: var(--lt-lh);
  background: var(--lt-bg-layout);
  color: var(--lt-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection      { background: var(--lt-primary-bg); color: var(--lt-text); }
::-moz-selection { background: var(--lt-primary-bg); color: var(--lt-text); }

a { color: var(--lt-primary); }
a:hover { color: var(--lt-primary-hover); }

/* Preflight-equivalent base reset (replaces the removed Tailwind CDN).
   Keeps the prior look: unstyled headings, zeroed list/heading margins. */
h1, h2, h3, h4, h5, h6 { font-size: inherit; font-weight: inherit; margin: 0; }
p, figure, blockquote, dl, dd, pre { margin: 0; }
ol, ul { list-style: none; margin: 0; padding: 0; }
img, svg, video, canvas { display: block; max-width: 100%; }
button, input, select, textarea { font-family: inherit; font-size: 100%; line-height: inherit; color: inherit; }
table { border-collapse: collapse; }

/* ─────────────────── 3. @keyframes ────────────────────────── */
@keyframes spin { to { transform: rotate(360deg); } }

@keyframes messageSlide {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes typingDot {
  0%, 60%, 100% { transform: translateY(0);     opacity: .5; }
  30%           { transform: translateY(-6px);   opacity: 1;  }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0);    }
  25%      { transform: translateX(-8px); }
  75%      { transform: translateX(8px);  }
}

/* ─────────── 4. Loading Overlay (JS-toggled .show) ─────────── */
.loading-overlay {
  position: fixed; inset: 0;
  display: none; opacity: 0;
  transition: opacity .15s ease;
  justify-content: center; align-items: center;
  z-index: 9999; pointer-events: none;
}
.loading-overlay.show {
  display: flex !important; opacity: 1; pointer-events: none;
}

.spinner {
  width: 44px; height: 44px;
  border: 3px solid var(--lt-primary-bg); border-top-color: var(--lt-primary);
  border-radius: 50%; animation: spin 1s linear infinite;
}
.loading-overlay .spinner {
  width: 40px; height: 40px; border-width: 3px;
  filter: drop-shadow(0 1px 3px rgba(0,0,0,.2));
}
/* Small spinner for inline use (e.g. the chat "thinking" bubble) */
.spinner-sm { display: inline-block; width: 20px; height: 20px; border-width: 2px; vertical-align: middle; }
.chat-thinking .message-content { padding: 8px 4px; }

/* ─────────── 5. Account Menu (JS-toggled .show) ────────────── */
.account-menu {
  position: fixed; top: var(--nav-h); right: 24px;
  width: 360px; max-width: 95vw;
  background: var(--lt-bg-elevated); color: var(--lt-text);
  border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius-xl);
  box-shadow: var(--lt-shadow);
  padding: 14px; z-index: 1000; display: none;
  font-family: inherit; max-height: min(70vh,600px); overflow: auto;
}
.account-menu.show { display: block; }
.account-menu .am-head { margin-bottom: 6px; }
.account-menu .am-title { font-weight: 600; color: var(--lt-text); }
.account-menu .am-sub { color: var(--lt-text-tertiary); font-size: 12px; margin-top: 2px; }
.account-menu .am-section {
  background: var(--lt-fill-quaternary); border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius-lg);
  padding: 12px; margin-top: 10px;
}
.account-menu .am-section-title { font-weight: 600; color: var(--lt-text); margin-bottom: 8px; }
.account-menu .am-row { display: grid; grid-template-columns: 1fr auto; gap: 8px; align-items: center; }
.account-menu input[type="text"] { border: 1px solid var(--lt-border); border-radius: var(--lt-radius); padding: 8px 12px; width: 100%; }
.account-menu .am-btn {
  padding: 8px 14px; border-radius: var(--lt-radius); border: none; cursor: pointer;
  color: var(--lt-text-on-primary); background: var(--lt-primary); font-weight: 600;
}
.account-menu .am-btn:hover { background: var(--lt-primary-hover); }
.account-menu .am-list { display: flex; flex-direction: column; gap: 8px; }
.account-menu .am-list .am-item {
  display: flex; align-items: center; gap: 10px;
  background: var(--lt-bg-container); border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius); padding: 8px;
}
.account-menu .am-item .am-grow { flex: 1; }
.account-menu .am-item .am-muted { color: var(--lt-text-tertiary); font-size: 12px; }
.account-menu .am-footer { margin-top: 10px; text-align: right; }
.account-menu .am-logout { color: var(--lt-error); font-weight: 600; text-decoration: none; }
.account-menu .am-logout:hover { color: var(--lt-error-active); }
@media (max-width: 900px) { .account-menu { right: 12px; left: 12px; width: auto; } }

/* ─────────── 6. Notification Toast (JS-toggled .show) ──────── */
.notification {
  position: fixed; top: 84px; right: 30px;
  padding: 12px 18px; border-radius: var(--lt-radius-lg);
  color: #fff; font-weight: 500; font-size: 14px;
  box-shadow: var(--lt-shadow);
  z-index: 10000; opacity: 0; transform: translateX(400px);
  transition: all 0.3s ease;
}
.notification.show    { opacity: 1; transform: translateX(0); }
.notification.success { background: var(--lt-success); }
.notification.error   { background: var(--lt-error); }

/* ─────────────────── 7. Navbar ─────────────────────────────── */
.navbar {
  background: var(--lt-bg-elevated); padding: 0 18px !important;
  color: var(--lt-text); box-shadow: none;
  position: sticky; top: 0; z-index: 100; overflow: hidden;
  border-bottom: 1px solid var(--lt-border-secondary);
  display: flex !important; justify-content: space-between;
  align-items: center !important;
  min-height: var(--nav-h); height: var(--nav-h) !important;
}
.navbar-left { display: flex; flex-direction: column; }
.navbar h1 { margin: 0; font-size: 20px; font-weight: 700; color: var(--lt-text); letter-spacing: -.01em; }
.navbar-subtitle { font-size: 12px; margin-top: 2px; font-weight: 400; color: var(--lt-text-tertiary); }
.navbar-right { display: flex; align-items: center; }

/* ─────────────────── 8. User Profile ───────────────────────── */
.user-profile {
  display: flex; align-items: center; gap: 10px;
  padding: 6px 10px; background: transparent;
  border-radius: var(--lt-radius-lg);
  transition: background 0.15s ease; cursor: pointer;
}
.user-profile:hover { background: var(--lt-fill-tertiary); }
.user-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--lt-primary);
  display: flex; align-items: center; justify-content: center;
  font-weight: 600; font-size: 14px; color: var(--lt-text-on-primary);
}
.user-info { display: flex; flex-direction: column; gap: 1px; }
.user-name  { font-weight: 600; font-size: 13px; color: var(--lt-text); }
.user-email { font-size: 12px; color: var(--lt-text-tertiary); }

/* ─────────────────── 9. Shared Sidebar ─────────────────────── */
.sidebar .sidebar-header { display: flex; align-items: center; gap: 8px; }
.sidebar:not(.collapsed) .sidebar-header {
  justify-content: space-between; padding: 16px;
  border-bottom: 1px solid var(--lt-border-secondary);
  background: transparent;
}
.sidebar.collapsed .sidebar-header {
  display: flex; justify-content: center; align-items: center;
  padding: 10px; border: 0; background: transparent;
}
.sidebar.collapsed .sidebar-header h3,
.sidebar.collapsed .add-project-btn { display: none !important; }
.sidebar .sidebar-controls { margin-left: auto; display: flex; gap: 8px; }
.sidebar.collapsed .project-info,
.sidebar.collapsed .project-list { display: none; }
.sidebar.collapsed .collapse-btn { width: 36px; height: 36px; }
.sidebar-header h3 {
  margin: 0; font-size: 15px; color: var(--lt-text); font-weight: 600;
  white-space: nowrap; overflow: hidden;
}
.sidebar-controls { display: flex; gap: 8px; align-items: center; }
.sidebar .collapse-btn {
  background: transparent;
  color: var(--lt-text-secondary); border: 1px solid var(--lt-border);
  border-radius: var(--lt-radius);
  width: 36px; height: 36px; padding: 0;
  font-size: 16px; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
  box-shadow: none;
  cursor: pointer; transition: background .15s ease, border-color .15s ease;
}
.sidebar .collapse-btn:hover {
  transform: none; box-shadow: none;
  background: var(--lt-fill-tertiary); border-color: var(--lt-border);
}

/* ─────────────────── 10. Project / Class Items ──────────────── */
.add-project-btn {
  width: 32px; height: 32px; padding: 0; font-size: 22px; line-height: 1;
  border-radius: var(--lt-radius); display: flex; align-items: center; justify-content: center;
  background: var(--lt-primary);
  box-shadow: none; border: none; color: var(--lt-text-on-primary);
  cursor: pointer; transition: background 0.15s ease;
}
.add-project-btn:hover { transform: none; box-shadow: none; background: var(--lt-primary-hover); }

.project-list { flex: 1; overflow-y: auto; padding: 8px; }
.project-list::-webkit-scrollbar       { width: 6px; }
.project-list::-webkit-scrollbar-track { background: transparent; }
.project-list::-webkit-scrollbar-thumb { background: var(--lt-fill); border-radius: 10px; }

.project-item {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; margin-bottom: 4px; border-radius: var(--lt-radius);
  cursor: pointer; transition: background .15s ease;
  background: transparent; border: 1px solid transparent; user-select: none;
}
.project-item:hover       { background: var(--lt-fill-tertiary); border-color: transparent; transform: none; }
.project-item.active      { background: var(--lt-primary-bg); border-color: var(--lt-primary-border); box-shadow: none; }
.project-icon             { width: 34px; height: 34px; border-radius: var(--lt-radius); background: var(--lt-fill-secondary); color: var(--lt-text-secondary); display: flex; align-items: center; justify-content: center; font-weight: 600; font-size: 12px; flex-shrink: 0; }
.project-item.active .project-icon { background: var(--lt-primary); color: var(--lt-text-on-primary); }
.project-info { flex: 1; min-width: 0; }
.project-name { font-weight: 600; font-size: 14px; color: var(--lt-text); margin-bottom: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.project-course { font-size: 12px; color: var(--lt-text-secondary); font-weight: 500; margin-bottom: 1px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.project-meta { font-size: 12px; color: var(--lt-text-tertiary); }

.empty-state {
  padding: 20px; text-align: center; color: var(--lt-text-tertiary); font-size: 14px; line-height: 1.6;
  background: var(--lt-fill-quaternary); border-radius: var(--lt-radius-lg); border: 1px dashed var(--lt-border); margin: 10px;
}

/* ─────────────────── 11. Context Menu ──────────────────────── */
.context-menu, .ctx-menu {
  position: fixed; background: var(--lt-bg-elevated); border: 1px solid var(--lt-border-secondary);
  border-radius: var(--lt-radius-lg); box-shadow: var(--lt-shadow);
  padding: 6px; z-index: 4000; min-width: 160px;
}
.ctx-menu { min-width: 180px; color: var(--lt-text); }
.context-menu-item {
  display: block; width: 100%; padding: 8px 12px;
  border: none; background: transparent; text-align: left; cursor: pointer;
  font: 500 14px/1.2 var(--lt-font);
  color: var(--lt-text); border-radius: var(--lt-radius);
}
.context-menu-item:hover  { background: var(--lt-fill-tertiary); }
.context-menu-item:active { background: var(--lt-fill-secondary); }

/* ─────────────────── 12. Buttons ───────────────────────────── */
button {
  padding: 8px 16px;
  background: var(--lt-primary);
  color: var(--lt-text-on-primary); border: none; border-radius: var(--lt-radius);
  cursor: pointer; font-weight: 500; font-size: 14px;
  transition: background 0.15s ease; box-shadow: none;
  position: relative; overflow: hidden;
}
button:hover  { transform: none; box-shadow: none; background: var(--lt-primary-hover); }
button:active { transform: none; background: var(--lt-primary-active); }
.btn-text, .btn-icon { position: relative; z-index: 1; }
.btn-icon { margin-left: 5px; font-size: 18px; }

.clear-btn, .icon-btn, .collapse-btn {
  padding: 7px 14px; font-size: 13px;
  background: transparent; color: var(--lt-text-secondary);
  border: 1px solid var(--lt-border); box-shadow: none;
}
.collapse-btn { min-width: 32px; padding: 7px 12px; font-size: 16px; font-weight: bold; }
.clear-btn:hover, .icon-btn:hover, .collapse-btn:hover { background: var(--lt-fill-tertiary); color: var(--lt-text); transform: none; }

button.small, .btn.small {
  padding: 5px 12px; font-size: 12px; border-radius: var(--lt-radius);
  box-shadow: none;
}

.download-btn {
  border-radius: var(--lt-radius); width: auto; height: auto; padding: 6px 14px;
  font-size: 14px; font-weight: 500; background-color: var(--lt-primary); color: #fff;
  border: none; cursor: pointer; transition: background .15s;
}
.download-btn:hover { background-color: var(--lt-primary-hover); }

button:focus-visible, a:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--lt-primary); outline-offset: 1px;
}
button, input, select, .CodeMirror { transition: border-color .15s, box-shadow .15s; }

/* ─────────────────── 13. Chat & Editor Panels ───────────────── */
.chat, .editor {
  flex: 1; display: flex; flex-direction: column;
  background: var(--lt-bg-container); border-radius: var(--lt-radius-lg);
  border: 1px solid var(--lt-border-secondary);
  box-shadow: var(--lt-shadow-secondary); padding: 16px;
  overflow: hidden; transition: none; min-width: 0;
}
.chat.collapsed, .editor.collapsed { flex: 0 0 auto; min-width: 200px; }
.chat:hover, .editor:hover { transform: none; box-shadow: var(--lt-shadow-secondary); }

.section-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 14px; border-bottom: 1px solid var(--lt-border-secondary); padding-bottom: 10px;
}
.instructor-page .section-header { margin-bottom: 10px; }
.section-header h2 { margin: 0; font-size: 16px; color: var(--lt-text); font-weight: 600; }
.section-controls { display: flex; gap: 8px; align-items: center; }
.section-content  { display: flex; flex-direction: column; flex: 1; overflow: hidden; min-height: 0; position: relative; }
.chat h2, .editor h2 { margin: 0 0 14px; font-size: 16px; color: var(--lt-text); border-bottom: 1px solid var(--lt-border-secondary); padding-bottom: 10px; font-weight: 600; }

/* ─────────────────── Orphan conversation title bar ─────────────────── */
.orphan-title-bar {
  padding: 4px 2px 10px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--lt-border-secondary);
}
.orphan-title-display {
  display: inline-block; max-width: 100%;
  font-size: 14px; font-weight: 500; color: var(--lt-text-secondary);
  padding: 3px 7px; border-radius: var(--lt-radius-sm);
  border: 1px solid transparent;
  cursor: text; transition: border-color .15s, background .15s;
}
.orphan-title-display:hover { border-color: var(--lt-border); background: var(--lt-fill-tertiary); }
.orphan-title-input {
  width: 100%; max-width: 420px;
  font-size: 14px; font-weight: 500; color: var(--lt-text);
  padding: 3px 7px; border: 1px solid var(--lt-primary); border-radius: var(--lt-radius-sm);
  outline: none; box-shadow: 0 0 0 2px var(--lt-primary-bg);
}

/* ─────────────────── 14. Messages ──────────────────────────── */
#messages {
  flex: 1; overflow-y: auto; padding: 12px 4px;
  background: transparent;
  border-radius: 0; margin-bottom: 12px;
  display: flex; flex-direction: column; gap: 6px;
  border: none;
}
#messages::-webkit-scrollbar       { width: 8px; }
#messages::-webkit-scrollbar-track { background: transparent; border-radius: 10px; }
#messages::-webkit-scrollbar-thumb { background: var(--lt-fill); border-radius: 10px; }
#messages::-webkit-scrollbar-thumb:hover { background: var(--lt-fill-secondary); }

.message { display: flex; margin: 2px 0; animation: messageSlide 0.25s ease-out; }
.message-content {
  padding: 8px 12px; border-radius: var(--lt-radius-lg); max-width: 76%;
  word-wrap: break-word; line-height: 1.6; box-shadow: none;
}
.message.user                  { justify-content: flex-end; }
.message.user .message-content { background: var(--lt-fill-tertiary); color: var(--lt-text); }
.message.ai                    { justify-content: flex-start; }
.message.ai .message-content   { background: transparent; color: var(--lt-text); border: none; max-width: 100%; padding-left: 0; padding-right: 0; }
.message-content pre, .message-content code { white-space: pre-wrap; word-break: break-word; }
.typing .message-content { padding: 8px 4px; }
.typing-dots { display: inline-flex; gap: 4px; }
.typing-dots span {
  width: 7px; height: 7px; background: var(--lt-text-tertiary); border-radius: 50%;
  display: inline-block; animation: typingDot 1.4s infinite;
}
.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

/* ─────────────────── 15. Input Row ─────────────────────────── */
.input-row { display: flex; gap: 8px; margin-top: auto; align-items: center; }
.upload-inline-btn {
  width: 40px; height: 40px; padding: 0;
  background: transparent;
  color: var(--lt-text-secondary); border: 1px solid var(--lt-border); border-radius: var(--lt-radius-lg); cursor: pointer;
  font-size: 22px; font-weight: 500;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s ease; box-shadow: none; flex-shrink: 0;
}
.upload-inline-btn:hover  { transform: none; box-shadow: none; background: var(--lt-fill-tertiary); color: var(--lt-text); }
.upload-inline-btn:active { transform: none; }
#userInput {
  flex: 1; padding: 10px 14px; border: 1px solid var(--lt-border);
  border-radius: var(--lt-radius-lg); font-size: 14px; transition: all 0.15s ease; outline: none;
  background: var(--lt-bg-container); color: var(--lt-text);
}
#userInput:focus { border-color: var(--lt-primary); box-shadow: 0 0 0 2px var(--lt-primary-bg); }
/* Composer is a <textarea> that auto-grows (JS caps the height at 160px). */
#userInput {
  resize: none; line-height: 1.4; min-height: 42px; max-height: 160px;
  overflow-y: auto; font-family: inherit;
}

/* ─────────────────── 16. Editor / Code / Output ─────────────── */
.editor-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; flex-wrap: wrap; gap: 10px; }
.editor-header h2 { margin: 0; border: none; padding: 0; }
.editor-controls { display: flex; gap: 12px; align-items: center; font-size: 14px; flex-wrap: wrap; }
.editor-controls label  { font-weight: 500; color: var(--lt-text-secondary); }
.editor-controls select { padding: 6px 12px; border: 1px solid var(--lt-border); border-radius: var(--lt-radius); font-size: 14px; cursor: pointer; outline: none; background: var(--lt-bg-container); color: var(--lt-text); }
.editor-controls select:focus { border-color: var(--lt-primary); box-shadow: 0 0 0 2px var(--lt-primary-bg); }
.CodeMirror {
  flex: 1; border: 1px solid var(--lt-border); border-radius: var(--lt-radius-lg); font-size: 14px;
  font-family: var(--lt-font-mono);
  margin-bottom: 14px; overflow: auto; box-shadow: none; max-width: 100%;
}
.CodeMirror-focused { border-color: var(--lt-primary); box-shadow: 0 0 0 2px var(--lt-primary-bg); }
.run-btn { width: 100%; margin-bottom: 14px; padding: 12px; font-size: 15px; background: var(--lt-primary); box-shadow: none; }
.run-btn:hover { box-shadow: none; background: var(--lt-primary-hover); }
.output-header { font-weight: 600; color: var(--lt-text-secondary); margin-bottom: 8px; font-size: 14px; }
#output {
  background: #1e1e1e; color: #d4d4d4; padding: 14px; border-radius: var(--lt-radius-lg);
  min-height: 120px; max-height: 200px; overflow-y: auto;
  font-family: var(--lt-font-mono);
  font-size: 13px; line-height: 1.6; border: 1px solid #2b2b2b;
  box-shadow: none;
}
#output::-webkit-scrollbar       { width: 8px; }
#output::-webkit-scrollbar-track { background: #2d2d2d; border-radius: 10px; }
#output::-webkit-scrollbar-thumb { background: #4b4b4b; border-radius: 10px; }

/* ─────────────────── 17. Status / Error text ───────────────── */
.success-text { color: var(--lt-success); background: var(--lt-success-bg); }
.error-text   { color: var(--lt-error); background: var(--lt-error-bg); }
.warning-text { color: var(--lt-warning-text); background: var(--lt-warning-bg); }
.info-text    { color: var(--lt-primary); background: var(--lt-primary-bg); }
.error-message {
  background: var(--lt-error-bg); color: var(--lt-error-text); padding: 12px; border-radius: var(--lt-radius);
  border-left: 3px solid var(--lt-error); margin: 10px 0;
  animation: messageSlide 0.25s ease-out;
}

/* ─────────────────── 18. Misc Shared Components ────────────── */
.scroll-bottom {
  position: absolute; bottom: 80px; right: 20px;
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--lt-bg-elevated); color: var(--lt-text-secondary); border: 1px solid var(--lt-border); cursor: pointer;
  box-shadow: var(--lt-shadow-secondary);
  display: none; align-items: center; justify-content: center;
  font-size: 18px; z-index: 10;
}
.scroll-bottom:hover { background: var(--lt-fill-tertiary); transform: none; }

.flashes { list-style: none; margin: 0 0 12px; padding: 0; }
.flash { margin: 10px 0; padding: 10px 14px; border-radius: var(--lt-radius); font-weight: 500; text-align: center; display: block; }
.flash.error   { background: var(--lt-error-bg); color: var(--lt-error-text); }
.flash.success { background: var(--lt-success-bg); color: #237804; }

.files-panel { margin-bottom: 12px; border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius-lg); padding: 10px; background: var(--lt-fill-quaternary); }
.files-panel-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; }
.files-panel-title { font-weight: 600; color: var(--lt-text); }
.files-list { display: flex; flex-direction: column; gap: 6px; max-height: 180px; overflow: auto; }
.files-row { display: grid; grid-template-columns: 1fr auto auto auto; gap: 6px; align-items: center; background: var(--lt-bg-container); border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius); padding: 8px 10px; }
.files-name  { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.files-scope { font-size: 12px; color: var(--lt-text-tertiary); }
.files-hint  { margin-top: 6px; font-size: 12px; color: var(--lt-text-tertiary); }

.item { display: flex; align-items: center; gap: 10px; padding: 10px 12px; background: var(--lt-bg-container); border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius); }
.item:hover  { box-shadow: var(--lt-shadow-secondary); }
.item.active { border-color: var(--lt-primary-border); box-shadow: none; background: var(--lt-primary-bg); }
.grow  { flex: 1 1 auto; min-width: 0; }
.grow .title { font-size: 14px; font-weight: 600; color: var(--lt-text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.grow .meta  { font-size: 12px; color: var(--lt-text-tertiary); margin-top: 2px; }
.empty { padding: 8px 10px; color: var(--lt-text-tertiary); font-size: 13px; }
.muted { color: var(--muted); font-size: 12px; }
#uploadStatus { margin-top: 8px; font-size: 13px; padding: 8px 12px; border-radius: var(--lt-radius); transition: all 0.3s; }

.section-content::-webkit-scrollbar       { width: 8px; }
.section-content::-webkit-scrollbar-thumb { background: var(--lt-fill); border-radius: 10px; }

/* ══════════════════════════════════════════════════════════════
   INSTRUCTOR-SPECIFIC
   ══════════════════════════════════════════════════════════════ */
body.instructor-page {
  margin: 0;
  background: var(--lt-bg-layout);
  color: var(--lt-text); display: flex; flex-direction: column; min-height: 100vh;
}

.main-layout {
  display: grid; grid-template-columns: auto minmax(0,1fr);
  /* Cap the single row at the container height. Without this the implicit row is
     auto-sized and GROWS with content once it exceeds one screen, so every height:100%
     descendant (container → split → sections → tab panels → audit/tutoring/file bodies)
     overgrows and the inner overflow:auto never gets a constrained height to scroll in —
     the excess is just clipped by overflow:hidden below. minmax(0,1fr) fixes the row to
     the container height so overflow happens inside the scroll panels instead. */
  grid-template-rows: minmax(0, 1fr);
  column-gap: var(--g); align-items: stretch;
  padding: var(--g); box-sizing: border-box;
  height: calc(100vh - var(--nav-h)); min-height: 0; overflow: hidden;
}

.instructor-page .sidebar {
  width: 280px; min-width: 280px; border-radius: var(--lt-radius-lg); background: var(--card);
  border: 1px solid var(--lt-border-secondary);
  display: flex; flex-direction: column; min-height: 0; box-sizing: border-box; overflow: hidden;
}
.instructor-page .sidebar.collapsed { width: 60px !important; min-width: 60px !important; overflow: hidden; }

.main-layout > .container { height: 100%; min-width: 0; box-sizing: border-box; padding: 0 var(--g) 0 0; }

#rosterAssignSplit.lt-split {
  padding-right: var(--g); display: flex; align-items: stretch;
  height: 100%; width: 100%; gap: 0; min-height: 0; box-sizing: border-box;
}
#rosterSection, #assignSection {
  display: flex; flex-direction: column; flex: 0 0 50%; min-width: 260px;
  height: 100%; overflow: auto; box-sizing: border-box;
  background: var(--card); border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius-lg); margin: 0;
}
#assignSection { overflow: hidden; margin-right: 0; max-width: 100%; }

#rosterAssignSplit .lt-handle {
  position: relative; width: var(--handle-w); min-width: var(--handle-w);
  margin: 0 8px; cursor: col-resize; border-radius: var(--lt-radius);
  background: var(--lt-fill-secondary);
  border: 1px solid var(--lt-border-secondary); box-shadow: none;
}
#rosterAssignSplit .lt-handle::before {
  content: ""; position: absolute; top: 8px; bottom: 8px; left: 5px; right: 5px;
  border-radius: 8px;
  background:
    linear-gradient(var(--lt-border),var(--lt-border)) left 5px / 2px 100% no-repeat,
    linear-gradient(var(--lt-border),var(--lt-border)) right 5px / 2px 100% no-repeat;
  opacity: .9;
}
#rosterAssignSplit .lt-handle::after {
  content: ""; position: absolute; top: -8px; bottom: -8px; left: -6px; right: -6px;
}
#rosterAssignSplit .lt-handle:hover {
  border-color: var(--lt-border);
  background: var(--lt-fill);
}

body.lt-dragging, body.lt-dragging * { user-select: none !important; cursor: col-resize !important; }

.card {
  background: var(--card); border-radius: var(--lt-radius-lg); border: 1px solid var(--lt-border-secondary);
  padding: 14px;
  transition: box-shadow .18s ease;
}
.card:hover { transform: none; box-shadow: var(--lt-shadow-secondary); }

.list { display: flex; flex-direction: column; gap: 10px; min-height: 0; }
.row  { display: grid; gap: 8px; align-items: center; }
.row input { border: 1px solid var(--lt-border); border-radius: var(--lt-radius); padding: 8px 12px; width: 100%; min-width: 0; }
.dropzone { border: 1px dashed var(--lt-border); background: var(--lt-fill-quaternary); border-radius: var(--lt-radius-lg); padding: 18px; text-align: center; color: var(--lt-text-secondary); }
.dropzone.dragover { background: var(--lt-primary-bg); border-color: var(--lt-primary); }
/* Compact variant — used in the assignment-files panel so the file list sits higher. */
.dropzone.compact { padding: 10px 12px; font-size: 13px; }

/* Visibility is managed by Alpine x-show (+ x-cloak guards the pre-init flash);
   the panel must NOT default to display:none, or x-show could never reveal it. */
#rosterBody { flex: 1 1 auto; min-height: 0; overflow: hidden; }
#studentList, #assignmentList { flex: 1 1 auto; min-height: 0; overflow: auto; }
#asnFilesCard { flex: 1 1 auto; min-height: 0; overflow: hidden; }
#asnFilesList { overflow-y: auto; min-height: 60px; }
/* Tutoring tab: let the threads + anonymous-links list scroll when taller than the panel
   (the section is overflow:hidden, so this body must own the scroll). */
#asnTutoringBody { flex: 1 1 auto; min-height: 0; overflow-y: auto; }
.hidden { display: none !important; }

/* Per-chat rows under an anonymous link: roomier vertical rhythm, slimmer action buttons.
   Layout/disabled state live here (not inline) so the row's :class toggle can't clobber it. */
.anon-chat-row { display: flex; align-items: center; gap: 6px; padding: 9px 6px; border-top: 1px solid #eef1f4; }
.anon-chat-row:first-child { border-top: none; }
.anon-chat-row.disabled { opacity: .55; }
.anon-chat-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.anon-chat-row .btn.small { padding: 3px 8px; font-size: 11px; }
.anon-chat-row .btn.small.icon { padding: 3px 6px; }

.class-sidebar-item {
  margin: 6px 10px; border-radius: var(--lt-radius-lg);
  border: 1px solid var(--lt-border-secondary); background: var(--lt-bg-container); overflow: hidden; transition: box-shadow .15s ease;
}
.class-sidebar-item:hover  { box-shadow: var(--lt-shadow-secondary); }
.class-sidebar-item.active { border-color: var(--lt-primary-border); box-shadow: 0 0 0 2px var(--lt-primary-bg); }
.class-sidebar-item.class-deactivated { border-color: var(--lt-border-secondary); background: var(--lt-fill-quaternary); opacity: .85; }
.class-sidebar-item.class-deactivated:hover { box-shadow: var(--lt-shadow-tertiary); }
.class-item-header { display: flex; align-items: center; gap: 10px; padding: 10px 12px; cursor: pointer; }
.class-item-header:hover { background: var(--lt-fill-tertiary); }
.class-btn-group { display: flex; flex-direction: column; align-items: center; gap: 4px; flex-shrink: 0; }
.asn-toggle-btn {
  background: none; border: none; cursor: pointer; color: var(--lt-text-tertiary);
  font-size: 11px; padding: 4px 6px; border-radius: var(--lt-radius); line-height: 1; flex-shrink: 0;
  transition: background .1s, color .1s;
}
.asn-toggle-btn:hover { background: var(--lt-primary-bg); color: var(--lt-primary); }
.class-disable-btn {
  background: none; border: 1px solid var(--lt-border); cursor: pointer; color: var(--lt-text-tertiary);
  font-size: 10px; padding: 2px 6px; border-radius: var(--lt-radius-sm); line-height: 1.4; flex-shrink: 0;
  transition: background .1s, color .1s, border-color .1s; white-space: nowrap;
}
.class-disable-btn:hover { background: var(--lt-error-bg); color: var(--lt-error-text); border-color: var(--lt-error-border); }
.class-activate-btn {
  background: none; border: 1px solid var(--lt-success-border); cursor: pointer; color: #237804;
  font-size: 10px; padding: 2px 6px; border-radius: var(--lt-radius-sm); line-height: 1.4; flex-shrink: 0;
  transition: background .1s, color .1s; white-space: nowrap;
}
.class-activate-btn:hover { background: var(--lt-success-bg); }
.class-deactivated-badge {
  display: inline-block; font-size: 10px; color: var(--lt-text-tertiary);
  background: var(--lt-fill-secondary); border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius-sm);
  padding: 1px 5px; font-weight: 500; letter-spacing: .02em;
}
.class-asn-dropdown { border-top: 1px solid var(--lt-border-secondary); background: var(--lt-fill-quaternary); padding: 8px 10px; }
.sidebar-asn-list  { display: flex; flex-direction: column; gap: 4px; margin-bottom: 6px; }
.sidebar-asn-row   { display: flex; align-items: center; gap: 6px; padding: 5px 8px; border-radius: var(--lt-radius); background: var(--lt-bg-container); border: 1px solid var(--lt-border-secondary); font-size: 12px; }
.sidebar-asn-row:hover { background: var(--lt-fill-tertiary); }
.sidebar-asn-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--lt-text); }

.rename-btn { background: none; border: none; cursor: pointer; color: var(--lt-text-tertiary); font-size: 13px; padding: 2px 4px; border-radius: var(--lt-radius-sm); line-height: 1; flex-shrink: 0; opacity: 1; transition: color .1s; }
.rename-btn:hover { color: var(--lt-primary); }
.class-rename-btn, .term-rename-btn, .assignment-rename-btn {
  display: inline-flex; align-items: center; justify-content: center; min-width: 20px; min-height: 20px;
}
.class-term-row { width: 100%; }
.assignment-rename-btn {
  margin-left: 2px; color: var(--lt-primary); background: var(--lt-primary-bg);
  border: 1px solid var(--lt-primary-border); border-radius: var(--lt-radius);
  padding: 3px 8px; font-size: 11px; font-weight: 600; white-space: nowrap;
}
.assignment-rename-btn:hover { background: var(--lt-primary-bg-hover); color: var(--lt-primary-active); }

.inline-rename-input {
  font: inherit; font-size: inherit; color: inherit;
  background: transparent; border: none; border-bottom: 2px solid var(--lt-primary);
  outline: none; width: 100%; padding: 0; margin: 0; box-sizing: border-box;
}

.sidebar-asn-check { display: flex; align-items: center; flex-shrink: 0; cursor: pointer; }
.sidebar-asn-check input[type="checkbox"] { width: 14px; height: 14px; margin: 0; accent-color: var(--lt-primary); cursor: pointer; }
.sidebar-asn-add-row { display: flex; gap: 6px; align-items: center; }
.sidebar-asn-input { flex: 1; min-width: 0; border: 1px solid var(--lt-border); border-radius: var(--lt-radius); padding: 5px 8px; font-size: 12px; background: var(--lt-bg-container); }
.sidebar-asn-input:focus { outline: none; border-color: var(--lt-primary); box-shadow: 0 0 0 2px var(--lt-primary-bg); }

.instructor-page .btn-icon {
  display: flex; align-items: center; justify-content: center;
  width: 24px; height: 24px; flex-shrink: 0;
  border-radius: var(--lt-radius); border: 1px solid var(--lt-primary-border); background: var(--lt-primary-bg);
  color: var(--lt-primary); font-size: 16px; font-weight: 700; line-height: 1;
  cursor: pointer; transition: background .1s;
}
.instructor-page .btn-icon:hover { background: var(--lt-primary-bg-hover); }
.asn-rm-btn { background: var(--lt-error-bg); border-color: var(--lt-error-border); color: var(--lt-error); }
.asn-rm-btn:hover { background: var(--lt-error-border); }

.tip {
  display: inline-flex; align-items: center; justify-content: center;
  width: 18px; height: 18px; font: 700 12px/1 var(--lt-font);
  border-radius: 50%; background: var(--lt-fill-secondary); color: var(--lt-text-secondary); border: 1px solid var(--lt-border-secondary);
  cursor: default; position: relative; margin-left: 6px; user-select: none;
  pointer-events: auto; z-index: 1;
}
.tip .tip-pop { display: none !important; }
#uiTip {
  position: fixed; left: -9999px; top: -9999px;
  background: var(--lt-bg-spotlight); color: #fff; border: none; border-radius: var(--lt-radius-lg);
  padding: 8px 12px; font-size: 12px; white-space: nowrap;
  box-shadow: var(--lt-shadow);
  z-index: 9999; opacity: 0; visibility: hidden;
  transition: opacity .12s ease, visibility .12s ease;
}
#uiTip.show { opacity: 1; visibility: visible; }
#uiTip::before {
  content: ""; position: absolute; top: -6px; left: 50%; transform: translateX(-50%);
  border-width: 6px; border-style: solid;
  border-color: transparent transparent var(--lt-bg-spotlight) transparent;
}

/* ══════════════════════════════════════════════════════════════
   STUDENT-SPECIFIC
   ══════════════════════════════════════════════════════════════ */
.student-page .container {
  display: flex; align-items: stretch !important;
  height: calc(100svh - var(--nav-h)) !important;
  gap: var(--g); padding: var(--g) !important;
  box-sizing: border-box; max-width: none; margin: 0;
  background: transparent; overflow: hidden; min-height: 0;
}

.student-page .sidebar {
  flex: 0 0 280px; min-width: 280px; margin-right: 20px;
  background: var(--lt-bg-container); border: 1px solid var(--lt-border-secondary);
  display: flex; flex-direction: column;
  box-shadow: none;
  transition: flex-basis .25s ease, margin-right .25s ease;
  border-radius: var(--lt-radius-lg); overflow: hidden; margin-top: 0;
}
.student-page .sidebar.collapsed {
  flex: 0 0 52px; min-width: 52px; margin-right: 12px;
  padding: 0; border-right: 0; overflow: hidden;
}

.student-page #chatEditorSplit.lt-split {
  display: flex; align-items: stretch;
  height: 100% !important; width: 100% !important; flex: 1 1 auto;
  gap: calc(var(--g) - var(--handle-w)); min-height: 0;
  padding-right: calc(var(--g) + var(--handle-w) / 2) !important;
  box-sizing: border-box;
}
.student-page #chatSection,
.student-page #editorSection,
.student-page .sidebar { margin: 0 !important; max-width: 100% !important; }
.student-page .sidebar,
.student-page #chatEditorSplit.lt-split { height: 100% !important; margin-bottom: 0 !important; min-height: 0 !important; }
.student-page .sidebar,
.student-page #chatEditorSplit.lt-split,
.student-page #chatSection,
.student-page #editorSection { min-height: 0 !important; }

.student-page .splitter {
  position: relative; width: var(--handle-w); min-width: var(--handle-w);
  margin: 0; cursor: col-resize; border-radius: var(--lt-radius);
  background: var(--lt-fill-secondary);
  border: 1px solid var(--lt-border-secondary); box-shadow: none;
  margin-inline: calc(var(--rail-gap) / 2);
}
.student-page .splitter::before {
  content: ""; position: absolute; top: 8px; bottom: 8px; left: 5px; right: 5px;
  border-radius: 8px;
  background:
    linear-gradient(var(--lt-border),var(--lt-border)) left 5px / 2px 100% no-repeat,
    linear-gradient(var(--lt-border),var(--lt-border)) right 5px / 2px 100% no-repeat;
  opacity: .9;
}
.student-page .splitter:hover {
  border-color: var(--lt-border);
  background: var(--lt-fill);
}

.drag-drop-overlay {
  display: none; position: absolute; inset: 0;
  background: var(--lt-primary-bg); border: 2px dashed var(--lt-primary);
  border-radius: var(--lt-radius-lg); z-index: 20;
  align-items: center; justify-content: center; pointer-events: none;
  opacity: .85;
}
.drag-drop-overlay.active { display: flex; }
.drag-drop-hint {
  background: var(--lt-bg-elevated); color: var(--lt-primary); font-size: 15px; font-weight: 600;
  padding: 14px 26px; border-radius: var(--lt-radius-lg); box-shadow: var(--lt-shadow-secondary);
}
.option-link {
  display: inline-block; padding: 8px 12px; border-radius: var(--lt-radius);
  background: var(--lt-fill-tertiary);
  color: var(--lt-primary); text-decoration: none;
  cursor: pointer; transition: background 0.15s ease; border: none; margin-bottom: 5px;
}
.option-link:hover { background: var(--lt-fill-secondary); transform: none; color: var(--lt-primary-hover); }

/* ══════════════════════════════════════════════════════════════
   LOGIN / AUTH PAGES
   ══════════════════════════════════════════════════════════════ */
body.login-page {
  background: var(--lt-bg-layout);
  min-height: 100vh; overflow: auto;
  display: flex; align-items: center; justify-content: center; position: relative;
}

.login-container { position: relative; z-index: 1; width: 100%; max-width: 420px; padding: 20px; }
.login-card { background: var(--lt-bg-container); border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius-xl); box-shadow: var(--lt-shadow); padding: 36px; animation: slideUp 0.4s ease-out; }
.logo-section { text-align: center; margin-bottom: 28px; padding-bottom: 22px; border-bottom: 1px solid var(--lt-border-secondary); }
.logo-section h1 { font-size: 28px; color: var(--lt-text); margin-bottom: 6px; font-weight: 700; letter-spacing: -.01em; }
.subtitle { font-size: 15px; color: var(--lt-text-tertiary); font-weight: 400; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; color: var(--lt-text-secondary); font-size: 14px; }
.form-group input, .form-group select {
  width: 100%; padding: 10px 14px; border: 1px solid var(--lt-border);
  border-radius: var(--lt-radius); font-size: 14px; transition: all 0.15s ease; background: var(--lt-bg-container); color: var(--lt-text); outline: none;
}
.form-group input:focus, .form-group select:focus { border-color: var(--lt-primary); box-shadow: 0 0 0 2px var(--lt-primary-bg); }
.form-group select {
  cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23737373' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 12px center; padding-right: 40px;
}
.login-btn {
  width: 100%; padding: 11px 24px;
  background: var(--lt-primary);
  color: var(--lt-text-on-primary); border: none; border-radius: var(--lt-radius);
  font-size: 15px; font-weight: 500; cursor: pointer;
  transition: background 0.15s ease; box-shadow: none;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  position: relative; overflow: hidden;
}
.login-btn:hover  { transform: none; box-shadow: none; background: var(--lt-primary-hover); }
.login-btn:active { transform: none; background: var(--lt-primary-active); }
.login-btn .btn-icon { font-size: 18px; transition: transform 0.15s ease; }
.login-btn:hover .btn-icon { transform: translateX(3px); }

.demo-info { margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--lt-border-secondary); text-align: center; }
.demo-info p { font-size: 13px; color: var(--lt-text-tertiary); margin-bottom: 6px; }
.demo-info a { color: var(--lt-primary); font-weight: 500; text-decoration: none; }
.demo-info a:hover { color: var(--lt-primary-hover); }
.demo-info code { background: var(--lt-fill-secondary); padding: 2px 8px; border-radius: var(--lt-radius-sm); font-family: var(--lt-font-mono); color: var(--lt-text); font-size: 12px; }

@media (max-width: 480px) {
  .login-card { padding: 28px 22px; }
  .logo-section h1 { font-size: 24px; }
  .subtitle { font-size: 14px; }
}

/* ══════════════════════════════════════════════════════════════
   DRAG / RESIZE STATE
   ══════════════════════════════════════════════════════════════ */
body.resizing, body.resizing * {
  user-select: none !important; cursor: col-resize !important; overflow: hidden;
}

/* ──────────────────── Accessibility ────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ══════════════════════════════════════════════════════════════
   ROSTER / AUDIT TABS  (right panel of instructor page)
   ══════════════════════════════════════════════════════════════ */
.roster-tab-bar, .asn-tab-bar {
  display: flex; align-items: center; gap: 4px;
  border-bottom: 1px solid var(--lt-border-secondary); margin: -14px -14px 12px;
  padding: 0 14px; background: var(--lt-fill-quaternary); border-radius: var(--lt-radius-lg) var(--lt-radius-lg) 0 0; flex-shrink: 0;
}
.roster-tab, .asn-tab {
  background: none; border: none; cursor: pointer;
  font-size: 13px; font-weight: 500; color: var(--lt-text-tertiary);
  padding: 10px 14px; border-bottom: 2px solid transparent; margin-bottom: -1px;
  transition: color .15s, border-color .15s; white-space: nowrap;
}
.roster-tab:hover, .asn-tab:hover { color: var(--lt-text); }
.roster-tab.active, .asn-tab.active { color: var(--lt-primary); border-bottom-color: var(--lt-primary); font-weight: 600; }

/* Right-oriented collapse toggle for the roster/audit panel */
.roster-collapse-btn {
  margin-left: 8px; flex-shrink: 0;
  background: transparent; color: var(--lt-text-secondary);
  border: 1px solid var(--lt-border); border-radius: var(--lt-radius);
  width: 28px; height: 28px; padding: 0;
  font-size: 14px; font-weight: 600; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: background .15s ease, border-color .15s ease;
}
.roster-collapse-btn:hover { background: var(--lt-fill-tertiary); color: var(--lt-text); }

.roster-collapsed-label { display: none; }

/* Collapsed state: panel shrinks to a thin strip, assignments panel grows */
#rosterSection.collapsed {
  flex: 0 0 48px !important; min-width: 48px !important;
  padding: 0 !important; overflow: hidden;
}
#rosterSection.collapsed .roster-tab,
#rosterSection.collapsed #rosterClassHint,
#rosterSection.collapsed .roster-tab-panel { display: none !important; }
#rosterSection.collapsed .roster-tab-bar {
  margin: 0; padding: 8px 0; justify-content: center;
  border-bottom: 1px solid var(--lt-border-secondary);
  border-radius: var(--lt-radius-lg) var(--lt-radius-lg) 0 0;
}
#rosterSection.collapsed .roster-collapse-btn { margin-left: 0; }
#rosterSection.collapsed .roster-collapsed-label {
  display: block; writing-mode: vertical-rl; text-orientation: mixed;
  margin: 14px auto 0; color: var(--lt-text-tertiary);
  font-size: 12px; font-weight: 600; letter-spacing: .04em;
  white-space: nowrap; cursor: pointer; user-select: none;
}
#rosterSection.collapsed .roster-collapsed-label:hover { color: var(--lt-text); }

.roster-tab-panel, .asn-tab-panel { display: flex; flex-direction: column; min-height: 0; flex: 1 1 auto; overflow: auto; }

/* Audit tabs (assignment + class): the body fills the panel and owns the vertical scroll
   when there are too many chats to fit on one screen. This mirrors #asnTutoringBody (a
   proven scroll panel): flex:1 in a definite-height flex column + min-height:0 + overflow.
   The sticky <th> keeps the column labels visible while the list scrolls. */
#asnAuditBody, #instAuditBody { min-height: 0; flex: 1 1 auto; overflow-y: auto; }
.inst-audit-table-wrap { overflow-x: auto; }

/* "Needs attention" strip: help-flagged threads + latest failing runs, above the audit table */
.inst-issues {
  margin: 0 0 12px; border: 1px solid var(--lt-border); border-radius: 8px;
  background: var(--lt-bg-container); overflow: hidden;
}
.inst-issues-head {
  padding: 6px 10px; font-size: 11px; font-weight: 700; letter-spacing: .02em;
  text-transform: uppercase; color: var(--lt-text-tertiary);
  border-bottom: 1px solid var(--lt-border);
}
.inst-issue {
  display: flex; align-items: center; gap: 10px; padding: 6px 10px; cursor: pointer;
  font-size: 12px; border-bottom: 1px solid var(--lt-border-secondary);
}
.inst-issue:last-child { border-bottom: none; }
.inst-issue:hover { background: var(--lt-fill-secondary); }
.inst-issue.flagged { background: var(--lt-warning-bg, #fef9ec); }
.inst-issue-who { white-space: nowrap; flex-shrink: 0; }
.inst-issue-who code { font-size: 11px; }
.inst-issue-err {
  flex: 1 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  color: var(--lt-text-secondary); font-family: var(--lt-font-mono, monospace); font-size: 11px;
}
.inst-issue-when { white-space: nowrap; font-size: 11px; color: var(--lt-text-tertiary); flex-shrink: 0; }
/* flagged row highlight in the sessions table */
.inst-audit-table tr.help-flagged td { background: var(--lt-warning-bg, #fef9ec); }

/* Assignment pills */
.inst-audit-pills { display: flex; flex-wrap: wrap; gap: 6px; }
.inst-audit-pill {
  background: var(--lt-fill-secondary); border: 1px solid var(--lt-border-secondary); border-radius: 20px;
  padding: 4px 12px; font-size: 12px; color: var(--lt-text-secondary); cursor: pointer;
  transition: background .12s, border-color .12s, color .12s; white-space: nowrap;
  max-width: 180px; overflow: hidden; text-overflow: ellipsis;
}
.inst-audit-pill:hover { background: var(--lt-primary-bg); border-color: var(--lt-primary-border); color: var(--lt-primary); }
.inst-audit-pill.active { background: var(--lt-primary); border-color: var(--lt-primary); color: #fff; }

/* Sessions table */
.inst-audit-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.inst-audit-table th {
  text-align: left; padding: 6px 8px; font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: .04em; color: var(--lt-text-tertiary);
  border-bottom: 1px solid var(--lt-border-secondary); background: var(--lt-fill-quaternary);
  position: sticky; top: 0; z-index: 1;
}
.inst-audit-table td { padding: 7px 8px; border-bottom: 1px solid var(--lt-border-secondary); vertical-align: middle; }
.inst-audit-table tr.audit-row { cursor: pointer; }
.inst-audit-table th.sortable { cursor: pointer; user-select: none; white-space: nowrap; }
.inst-audit-table th.sortable:hover { color: var(--lt-text-secondary); }
.inst-audit-table tr:last-child td { border-bottom: none; }
.inst-audit-table tr:hover td { background: var(--lt-fill-tertiary); }
.inst-audit-empty { text-align: center; color: var(--lt-text-tertiary); padding: 20px 0 !important; font-style: italic; }

/* Conversation modal */
.inst-audit-modal-overlay {
  position: fixed; inset: 0; background: var(--lt-bg-mask);
  display: flex; align-items: center; justify-content: center; z-index: 1200;
}
.inst-audit-modal {
  background: var(--lt-bg-elevated); border-radius: var(--lt-radius-xl); box-shadow: var(--lt-shadow);
  width: min(680px, 94vw); max-height: 82vh; display: flex; flex-direction: column; overflow: hidden;
}
.inst-audit-modal-header {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
  padding: 16px 20px; border-bottom: 1px solid var(--lt-border-secondary); flex-shrink: 0;
}
.inst-audit-modal-title { font-size: 16px; font-weight: 600; color: var(--lt-text); }
.inst-audit-modal-sub   { font-size: 12px; color: var(--lt-text-tertiary); margin-top: 2px; }
.inst-audit-messages    { flex: 1 1 auto; overflow-y: auto; padding: 16px 20px; display: flex; flex-direction: column; gap: 12px; }

.inst-audit-msg { display: flex; flex-direction: column; gap: 3px; max-width: 90%; }
.inst-audit-msg-user { align-self: flex-end; align-items: flex-end; }
.inst-audit-msg-ai   { align-self: flex-start; }
.inst-audit-msg-label { font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; color: var(--lt-text-tertiary); }
.inst-audit-msg-bubble {
  padding: 9px 13px; border-radius: var(--lt-radius-lg); font-size: 13px; line-height: 1.5;
  white-space: pre-wrap; word-break: break-word;
}
.inst-audit-msg-user .inst-audit-msg-bubble { background: var(--lt-primary-bg); color: var(--lt-text); }
.inst-audit-msg-ai   .inst-audit-msg-bubble { background: var(--lt-fill-tertiary); color: var(--lt-text); }

/* Uploaded-file links: top list + inline-in-thread */
.inst-audit-files {
  flex-shrink: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  padding: 10px 20px; border-bottom: 1px solid var(--lt-border-secondary); background: var(--lt-fill-quaternary);
}
.inst-audit-files-label {
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; color: var(--lt-text-tertiary);
}
.inst-audit-file-chip {
  display: inline-flex; align-items: center; gap: 4px;
  border: 1px solid var(--lt-primary-border); background: var(--lt-primary-bg); color: var(--lt-primary);
  border-radius: 999px; padding: 4px 12px; font-size: 12px; text-decoration: none; white-space: nowrap;
}
.inst-audit-file-chip:hover { background: var(--lt-primary-bg-hover); }
.inst-audit-fileline { align-self: stretch; font-size: 12px; color: var(--lt-text-secondary); }
.inst-audit-fileline a { color: var(--lt-primary); font-weight: 600; }


/* ==============================================================
   19. STUDENT PAGE — threads, pending files, chat code blocks, compile UI
   ============================================================== */
  .thread-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    padding: 8px 16px;
    border-bottom: 1px solid var(--lt-border-secondary);
    background: var(--lt-fill-quaternary);
  }
  .thread-bar-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--muted);
  }
  .thread-pills {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    flex: 1;
    min-width: 0;
  }
  .thread-pill {
    border: 1px solid var(--lt-border-secondary);
    background: var(--lt-fill-secondary);
    color: var(--lt-text-secondary);
    border-radius: 999px;
    padding: 4px 12px;
    font-size: 12px;
    cursor: pointer;
    white-space: nowrap;
    transition: background .15s, border-color .15s, color .15s;
  }
  .thread-pill:hover { background: var(--lt-fill-tertiary); }
  .thread-pill.active { background: var(--lt-primary); color: #fff; border-color: var(--lt-primary); }

  /* Pending (staged) file chips above the input row */
  .pending-files {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 8px 0 0;
  }
  .pending-file {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--lt-fill-tertiary);
    border: 1px solid var(--lt-border-secondary);
    border-radius: var(--lt-radius);
    padding: 4px 6px 4px 10px;
    font-size: 12px;
    color: var(--lt-text-secondary);
    max-width: 260px;
  }
  .pending-file .pf-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .pending-file .pf-size { color: var(--muted); font-size: 11px; flex-shrink: 0; }
  .pending-file .pf-remove {
    border: none; background: transparent; color: var(--muted);
    cursor: pointer; font-size: 15px; line-height: 1; padding: 0 2px; flex-shrink: 0;
  }
  .pending-file .pf-remove:hover { color: var(--lt-error); }
  .message .msg-attachments { margin-top: 6px; display: flex; flex-wrap: wrap; gap: 4px; }
  .message .msg-attachment { font-size: 11px; background: var(--lt-fill-secondary); border-radius: var(--lt-radius-sm); padding: 2px 6px; }

  /* Code blocks rendered inside chat messages (dark, paired with highlight.js) */
  .code-wrap {
    margin: 8px 0;
    border: 1px solid #1f2937;
    border-radius: var(--lt-radius-lg);
    overflow: hidden;
    background: #282c34;
  }
  .code-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 4px 10px;
    background: #21252b;
    color: #9aa4b2;
    font-size: 11px;
  }
  .code-lang { text-transform: uppercase; letter-spacing: .05em; font-weight: 600; }
  .code-copy {
    background: transparent;
    border: 1px solid #3a4150;
    color: #cbd5e1;
    border-radius: var(--lt-radius);
    padding: 2px 8px;
    font-size: 11px;
    cursor: pointer;
  }
  .code-copy:hover { background: #3a4150; color: #fff; }
  .message-content pre.code-block {
    margin: 0;
    padding: 12px 14px;
    overflow-x: auto;
    font-family: var(--lt-font-mono);
    font-size: 12.5px;
    line-height: 1.5;
    background: #282c34;
  }
  .message-content pre.code-block code,
  .message-content pre.code-block code.hljs {
    background: transparent;
    padding: 0;
    font-family: inherit;
    white-space: pre;
  }
  .message-content code.inline-code {
    background: var(--lt-fill-secondary);
    color: var(--lt-text);
    padding: 1px 5px;
    border-radius: var(--lt-radius-sm);
    font-family: var(--lt-font-mono);
    font-size: .92em;
  }

  /* Compile/run result card — terminal-style status bar + monospace output. Shown for
     chat turns reloaded from history on the student/anon chat and the Deep Coding IDE
     (renderMessageHtml in student/render.js). Global, not scoped to .message-content,
     so it renders identically inside .ide-msg-content as well. */
  .run-result {
    margin: 8px 0;
    border: 1px solid #1f2937;
    border-radius: var(--lt-radius-lg);
    overflow: hidden;
    background: #282c34;
  }
  .run-result-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 4px 10px;
    background: #21252b;
    font-size: 11px;
  }
  .run-result-status { font-weight: 600; letter-spacing: .02em; }
  .run-result.run-ok   .run-result-status { color: #4ade80; }
  .run-result.run-fail .run-result-status { color: #f87171; }
  .run-result-meta { color: #9aa4b2; text-transform: uppercase; letter-spacing: .05em; }
  .run-result-body {
    margin: 0;
    padding: 12px 14px;
    overflow-x: auto;
    font-family: var(--lt-font-mono);
    font-size: 12.5px;
    line-height: 1.5;
    color: #e6e6e6;
    background: #282c34;
    white-space: pre-wrap;
    word-break: break-word;
  }

  /* ── Auto-repair colored diff ─────────────────────────────────
     Shown under run output when the code was auto-fixed: removed lines red,
     added lines green. Rendered by autoRepairDiffHtml() (common.js). */
  .ar-diff { margin-top: 8px; border: 1px solid var(--lt-border); border-radius: var(--lt-radius); overflow: hidden; }
  .ar-diff-head {
    padding: 5px 10px; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .03em;
    color: var(--lt-text-tertiary); background: var(--lt-bg-elevated); border-bottom: 1px solid var(--lt-border);
  }
  .ar-diff-body {
    margin: 0; padding: 8px 10px; overflow: auto; max-height: 260px;
    font-family: var(--lt-font-mono); font-size: 12px; line-height: 1.45; white-space: pre;
  }
  .ar-diff-body .d-del { display: block; color: var(--lt-error-text); background: var(--lt-error-bg); }
  .ar-diff-body .d-ins { display: block; color: #237804; background: var(--lt-success-bg); }
  .ar-diff-body .d-ctx { display: block; color: var(--lt-text-secondary); }
  .ar-diff-body .d-gap { display: block; color: var(--lt-text-tertiary); text-align: center; }

  /* ── Compile offer bar ────────────────────────────────────── */
  .compile-offer {
    margin-top: 10px;
    padding: 8px 12px;
    background: var(--lt-primary-bg);
    border: 1px solid var(--lt-primary-border);
    border-radius: var(--lt-radius);
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
  }
  .compile-offer-label { font-size: 13px; color: var(--lt-text-secondary); flex: 1; }
  .compile-run-btn {
    background: var(--lt-primary); color: #fff; border: none;
    border-radius: var(--lt-radius); padding: 5px 14px;
    font-size: 13px; cursor: pointer; font-weight: 500;
  }
  .compile-run-btn:hover { background: var(--lt-primary-hover); }

  /* ── Compile form (stdin input) ───────────────────────────── */
  .compile-form {
    background: var(--lt-fill-quaternary); border: 1px solid var(--lt-border-secondary);
    border-radius: var(--lt-radius-lg); padding: 14px;
  }
  .compile-form-header {
    font-weight: 700; font-size: 12px; color: var(--lt-text-secondary);
    margin-bottom: 10px; text-transform: uppercase; letter-spacing: .04em;
  }
  .compile-form label {
    font-size: 12px; font-weight: 600; color: var(--lt-text-secondary);
    display: block; margin-bottom: 4px;
  }
  .compile-stdin {
    width: 100%; min-height: 72px; font-family: var(--lt-font-mono);
    font-size: 12px; padding: 7px; border: 1px solid var(--lt-border);
    border-radius: var(--lt-radius); resize: vertical; box-sizing: border-box;
    margin-bottom: 6px; background: var(--lt-bg-container);
  }
  .compile-form-actions { display: flex; gap: 8px; margin-top: 4px; flex-wrap: wrap; }
  .compile-suggest-btn {
    background: transparent; border: 1px solid var(--lt-border);
    color: var(--lt-text-secondary); border-radius: var(--lt-radius); padding: 4px 10px;
    font-size: 12px; cursor: pointer;
  }
  .compile-suggest-btn:hover { background: var(--lt-fill-tertiary); }
  .compile-suggest-btn:disabled { opacity: .55; cursor: default; }
  .compile-go-btn {
    background: var(--lt-primary); color: #fff; border: none;
    border-radius: var(--lt-radius); padding: 5px 16px;
    font-size: 13px; cursor: pointer; font-weight: 500;
  }
  .compile-go-btn:hover { background: var(--lt-primary-hover); }
  .compile-cancel-btn {
    background: transparent; border: 1px solid var(--lt-border);
    color: var(--muted); border-radius: var(--lt-radius); padding: 5px 12px;
    font-size: 13px; cursor: pointer;
  }
  .compile-cancel-btn:hover { background: var(--lt-fill-tertiary); }

  /* ── Security-rejected compile block ─────────────────────────── */
  .compile-security-notice {
    background: var(--lt-warning-bg); border: 1px solid var(--lt-warning-border);
    border-radius: var(--lt-radius); padding: 10px 14px;
    margin-bottom: 10px; font-size: 13px; color: var(--lt-warning-text);
  }
  .compile-security-notice strong { display: block; margin-bottom: 4px; }
  .compile-security-reasons {
    list-style: disc; padding-left: 18px; margin: 6px 0 0;
    font-size: 12px; color: var(--lt-warning-text);
  }
  /* Failed assistant message + retry control */
  .message.ai.message-failed .message-content {
    border-left: 3px solid var(--lt-warning); background: var(--lt-warning-bg); padding-left: 12px;
  }
  .msg-retry-bar { margin-top: 8px; }
  .msg-retry-btn {
    font-size: 12px; font-weight: 600; cursor: pointer;
    color: var(--lt-warning-text); background: var(--lt-bg-container); border: 1px solid var(--lt-warning-border);
    border-radius: var(--lt-radius); padding: 4px 12px; transition: background .15s;
  }
  .msg-retry-btn:hover { background: var(--lt-warning-bg); }
  .msg-retry-btn:disabled { opacity: .55; cursor: default; }

  /* ---- Per-session uploaded-files bar (below the Sessions switcher) ---- */
  .session-files-bar {
    display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
    padding: 7px 16px;
    border-bottom: 1px solid var(--lt-border-secondary);
    background: var(--lt-bg-container);
  }
  .session-files-label {
    font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em;
    color: var(--muted); flex-shrink: 0;
  }
  .session-files-list { display: flex; gap: 8px; flex-wrap: wrap; flex: 1; min-width: 0; align-items: center; }
  .session-files-group { display: inline-flex; align-items: center; gap: 6px; flex-wrap: wrap; }
  .session-files-folder {
    display: inline-flex; align-items: center; gap: 4px;
    font-size: 11px; color: var(--muted); font-family: monospace;
    padding: 2px 7px; background: var(--lt-fill-secondary);
    border: 1px solid var(--lt-border-secondary); border-radius: 6px; white-space: nowrap;
  }
  .session-file-chip {
    display: inline-flex; align-items: center; gap: 6px;
    border: 1px solid var(--lt-border-secondary); background: var(--lt-fill-secondary);
    color: var(--lt-text-secondary); border-radius: 999px;
    padding: 4px 12px; font-size: 12px; cursor: pointer; max-width: 240px;
    transition: background .15s, border-color .15s;
  }
  .session-file-chip:hover { background: var(--lt-fill-tertiary); border-color: var(--lt-primary-border); }
  .session-file-chip.code { border-color: var(--lt-primary-border); color: var(--lt-primary); }
  .session-file-chip.missing { opacity: .5; }
  .session-file-chip .sfc-icon { font-size: 11px; font-family: monospace; flex-shrink: 0; }
  .session-file-chip .sfc-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

  /* Clickable attachment chip in the student's own turn */
  .message .msg-attachment.clickable { cursor: pointer; }
  .message .msg-attachment.clickable:hover { background: var(--lt-fill-tertiary); }

  /* In-thread file marker (reloaded threads) */
  .file-marker { background: none; padding: 0; margin: 4px 0; display: block; }
  .thread-file-chip {
    display: inline-flex; align-items: center; gap: 6px;
    border: 1px dashed var(--lt-border-secondary); background: var(--lt-fill-secondary);
    color: var(--lt-text-secondary); border-radius: var(--lt-radius);
    padding: 4px 10px; font-size: 12px; cursor: pointer; max-width: 320px;
  }
  .thread-file-chip:hover { background: var(--lt-fill-tertiary); border-color: var(--lt-primary-border); }
  .thread-file-chip.code { color: var(--lt-primary); border-color: var(--lt-primary-border); }
  .thread-file-chip.disabled { cursor: default; opacity: .6; }
  .thread-file-chip .tfc-icon { font-family: monospace; font-size: 11px; flex-shrink: 0; }
  .thread-file-chip .tfc-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

  /* ---- File compile/edit window (modal) ---- */
  .sf-modal {
    display: none; position: fixed; inset: 0; z-index: 9500;
    background: var(--lt-bg-mask); align-items: center; justify-content: center; padding: 24px;
  }
  .sf-modal.open { display: flex; }
  .sf-box {
    background: var(--lt-bg-elevated); border-radius: var(--lt-radius-xl);
    width: min(760px, 96vw); max-height: 90vh; display: flex; flex-direction: column;
    box-shadow: var(--lt-shadow); overflow: hidden;
  }
  .sf-header {
    display: flex; align-items: center; justify-content: space-between; gap: 12px;
    padding: 14px 18px; border-bottom: 1px solid var(--lt-border-secondary); flex-shrink: 0;
  }
  .sf-title { font-size: 15px; font-weight: 600; color: var(--lt-text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .sf-title.clickable { cursor: pointer; }
  .sf-title.clickable:hover { color: var(--lt-primary); text-decoration: underline dotted; text-underline-offset: 2px; }
  /* inline file rename in the modal header */
  .sf-rename-wrap { display: inline-flex; align-items: center; gap: 8px; min-width: 0; flex: 1; }
  .sf-rename-input {
    font: inherit; font-size: 15px; font-weight: 600; color: var(--lt-text);
    background: var(--lt-bg-container); border: 1px solid var(--lt-primary);
    border-radius: var(--lt-radius-sm); padding: 4px 8px; min-width: 180px; max-width: 420px; outline: none;
  }
  .sf-rename-err { font-size: 12px; color: var(--lt-error-text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
  .sf-header-actions { display: flex; gap: 8px; flex-shrink: 0; }
  .sf-body { padding: 16px 18px; overflow-y: auto; display: flex; flex-direction: column; gap: 14px; }
  .sf-loading { color: var(--muted); text-align: center; padding: 24px 0; }
  .sf-meta { font-size: 12px; color: var(--muted); }
  .sf-section { display: flex; flex-direction: column; gap: 8px; }
  .sf-section-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
  .sf-label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
  .sf-muted { font-size: 12px; color: var(--muted); font-weight: 400; text-transform: none; letter-spacing: 0; }
  .sf-editor {
    width: 100%; box-sizing: border-box; min-height: 220px; max-height: 42vh; resize: vertical;
    font-family: monospace; font-size: 13px; line-height: 1.5; padding: 10px;
    border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius);
    background: var(--lt-bg-container); color: var(--lt-text);
  }
  .sf-stdin {
    width: 100%; box-sizing: border-box; resize: vertical;
    font-family: monospace; font-size: 13px; padding: 8px;
    border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius);
    background: var(--lt-bg-container); color: var(--lt-text);
  }
  .sf-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
  .sf-output {
    margin: 0; padding: 12px; border-radius: var(--lt-radius);
    background: var(--lt-fill-secondary); color: var(--lt-text);
    font-size: 12px; white-space: pre-wrap; word-break: break-word; max-height: 280px; overflow-y: auto;
  }
  .sf-summary { font-size: 13px; color: var(--lt-text-secondary); line-height: 1.5; white-space: pre-wrap; max-height: 320px; overflow-y: auto; }
  .sf-analysis { font-size: 13px; color: var(--lt-text-secondary); line-height: 1.5; }
  .sf-analysis .sf-desc { margin: 0 0 8px; color: var(--lt-text); }
  .sf-note { font-size: 12px; margin-top: 6px; color: var(--lt-text-secondary); }
  .sf-note-warn { background: var(--lt-warning-bg); color: var(--lt-warning-text); border-radius: var(--lt-radius); padding: 6px 10px; }
  .sf-stale { font-size: 12px; color: var(--lt-warning-text); background: var(--lt-warning-bg); border-radius: var(--lt-radius); padding: 6px 10px; margin-bottom: 8px; }

/* ==============================================================
   20. INSTRUCTOR PAGE — files header, compile modal, hints, failed-task queue
   ============================================================== */
.files-section-hdr {
  font-size: 11px; font-weight: 600; text-transform: uppercase;
  letter-spacing: .05em; color: var(--muted); padding: 8px 2px 2px; margin-top: 4px;
}
/* Star toggle that pins a file to the top of its file-type group */
.file-star {
  flex-shrink: 0; margin-top: 1px; padding: 0 2px;
  background: none; border: none; cursor: pointer;
  font-size: 15px; line-height: 1; color: var(--lt-text-quaternary);
  transition: color .12s, transform .12s;
}
.file-star:hover { color: var(--lt-warning); transform: scale(1.15); }
.file-star.on { color: var(--lt-warning); }
/* Compact file row (name-only list; details open in the modal) */
/* cursor lives here (not inline): the row's :style string-binding replaces the
   style attribute on render, so an inline cursor:pointer would be wiped. */
.file-row { cursor: pointer; }
.file-row-name {
  min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-size: 13px; color: var(--lt-text);
}
.file-row:hover { filter: brightness(0.97); }
.file-row:hover .file-row-name { text-decoration: underline; }
/* Download glyph on non-text (download-on-click) rows */
.file-dl {
  flex-shrink: 0; padding: 0 4px; background: none; border: none; cursor: pointer;
  font-size: 15px; line-height: 1; color: var(--lt-text-tertiary);
  transition: color .12s, transform .12s;
}
.file-dl:hover { color: var(--lt-primary); transform: translateY(1px); }
.fd-header-actions { display: flex; gap: 8px; flex-shrink: 0; }

/* ── File-detail / edit modal ─────────────────────────────────── */
#fileDetailModal {
  display: none; position: fixed; inset: 0; background: var(--lt-bg-mask);
  align-items: center; justify-content: center; z-index: 1280;
}
#fileDetailModal.open { display: flex; }
#fileDetailBox {
  background: var(--lt-bg-elevated); border-radius: var(--lt-radius-xl); box-shadow: var(--lt-shadow);
  width: min(900px, 95vw); max-height: 90vh; display: flex; flex-direction: column; overflow: hidden;
}
.fd-header {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px 18px; border-bottom: 1px solid var(--lt-border-secondary); flex-shrink: 0;
}
.fd-title-wrap { display: flex; align-items: center; gap: 8px; min-width: 0; }
.fd-title {
  font-size: 15px; font-weight: 600; color: var(--lt-text);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.fd-body { padding: 16px 18px; overflow-y: auto; display: flex; flex-direction: column; gap: 14px; }
.fd-loading { text-align: center; color: var(--lt-text-tertiary); padding: 24px 0; }
.fd-active { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--lt-text-secondary); cursor: pointer; }
.fd-section { display: flex; flex-direction: column; gap: 6px; }
.fd-label {
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em;
  color: var(--lt-text-tertiary);
}
.fd-muted { font-size: 12px; color: var(--lt-text-tertiary); font-weight: 400; text-transform: none; letter-spacing: 0; }
.fd-summary { font-size: 13px; color: var(--lt-text-secondary); line-height: 1.5; }
.fd-remarks {
  font-size: 13px; color: var(--lt-text-secondary); line-height: 1.5; white-space: pre-wrap;
  padding: 8px 10px; background: var(--lt-fill-quaternary); border-radius: var(--lt-radius);
}
.fd-editor {
  width: 100%; box-sizing: border-box; min-height: 280px; max-height: 55vh; resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px; line-height: 1.55; padding: 10px 12px; tab-size: 4;
  border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius);
  color: var(--lt-text); background: var(--lt-bg-container); white-space: pre; overflow: auto;
}
.fd-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.fd-tags { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.fd-tag-chip {
  display: inline-flex; align-items: center; gap: 5px;
  border: 1px solid var(--lt-primary-border); background: var(--lt-primary-bg); color: var(--lt-primary);
  border-radius: 999px; padding: 3px 6px 3px 10px; font-size: 12px; white-space: nowrap;
}
.fd-tag-chip.fd-tag-private {
  border-color: var(--lt-border-secondary); background: var(--lt-fill-secondary); color: var(--lt-text-secondary);
}
.fd-tag-x {
  border: none; background: transparent; cursor: pointer; color: inherit; opacity: .7;
  font-size: 11px; line-height: 1; padding: 2px; border-radius: 999px;
}
.fd-tag-x:hover { opacity: 1; }
.fd-tag-add {
  font-size: 12px; padding: 3px 8px; border-radius: 999px;
  border: 1px dashed var(--lt-border-secondary); background: var(--lt-bg-container); color: var(--lt-text-secondary);
  cursor: pointer;
}
.fd-risk {
  padding: 10px 12px; background: var(--lt-warning-bg);
  border: 1px solid var(--lt-warning-border); border-left: 3px solid var(--lt-warning);
  border-radius: var(--lt-radius); font-size: 12.5px; color: var(--lt-warning-text);
}
.fd-risk-hdr { font-weight: 600; margin-bottom: 4px; }
.fd-risk ul { margin: 4px 0 8px 18px; }
.btn.danger { background: var(--lt-error, #d4380d); color: #fff; border-color: transparent; }
#compileModal { display: none; position: fixed; inset: 0; background: var(--lt-bg-mask);
  align-items: center; justify-content: center; z-index: 1300; }
#compileModal.open { display: flex; }
#compileModalBox {
  background: var(--lt-bg-elevated); border-radius: var(--lt-radius-xl); box-shadow: var(--lt-shadow);
  width: min(640px, 94vw); max-height: 88vh; display: flex; flex-direction: column; overflow: hidden;
}
/* ── Generate-hints review/regenerate overlay ─────────────────── */
#genHintsModal { display: none; position: fixed; inset: 0; background: var(--lt-bg-mask);
  align-items: center; justify-content: center; z-index: 1300; }
#genHintsModal.open { display: flex; }
#genHintsModalBox {
  background: var(--lt-bg-elevated); border-radius: var(--lt-radius-xl); box-shadow: var(--lt-shadow);
  width: min(640px, 94vw); max-height: 88vh; display: flex; flex-direction: column; overflow: hidden;
}
.gh-hdr {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
  padding: 16px 20px; border-bottom: 1px solid var(--lt-border-secondary); flex-shrink: 0;
}
.gh-title { font-size: 16px; font-weight: 600; color: var(--lt-text); }
.gh-sub { font-size: 12px; color: var(--lt-text-tertiary); margin-top: 2px; }
.gh-body { flex: 1; overflow-y: auto; padding: 16px 20px; display: flex; flex-direction: column; gap: 12px; }
.gh-item {
  border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius-lg);
  background: var(--lt-fill-quaternary); overflow: hidden;
}
.gh-item-file {
  font-size: 12px; font-weight: 600; color: var(--lt-text-secondary);
  padding: 6px 10px; border-bottom: 1px solid var(--lt-border-secondary);
  display: flex; align-items: center; gap: 8px;
}
.gh-item-text {
  margin: 0; padding: 8px 10px; font-family: var(--lt-font-mono); font-size: 12px;
  line-height: 1.5; color: var(--lt-text); white-space: pre-wrap; word-break: break-word;
  max-height: 220px; overflow-y: auto;
}
.gh-regen {
  border-top: 1px solid var(--lt-border-secondary); padding-top: 12px;
  display: flex; flex-direction: column; gap: 6px;
}
.gh-regen-label {
  font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: .04em;
  color: var(--lt-text-secondary);
}
.gh-regen textarea {
  width: 100%; box-sizing: border-box; resize: vertical; font-family: inherit;
  font-size: 13px; padding: 8px; border: 1px solid var(--lt-border); border-radius: var(--lt-radius);
  background: var(--lt-bg-container); color: var(--lt-text);
}
.gh-regen-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
/* ── Compilation hint panel ──────────────────────────────────── */
.hint-panel {
  margin-top: 6px; padding: 10px 12px;
  background: var(--lt-fill-quaternary); border: 1px solid var(--lt-border-secondary); border-radius: var(--lt-radius-lg);
  font-size: 12px;
}
.hint-panel-hdr {
  display: flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 11px; color: var(--lt-text-secondary);
  text-transform: uppercase; letter-spacing: .04em;
  cursor: pointer; user-select: none;
}
.hint-panel-hdr:hover { color: var(--lt-text); }
.hint-chevron { margin-left: auto; font-size: 10px; color: var(--lt-text-tertiary); transition: transform .15s; }
.hint-body { margin-top: 8px; }
.hint-badge {
  font-size: 10px; padding: 1px 6px; border-radius: var(--lt-radius-sm); font-weight: 600;
  letter-spacing: .02em; text-transform: uppercase;
}
.hint-badge-auto  { background: var(--lt-primary-bg); color: var(--lt-primary-active); }
.hint-badge-cust  { background: var(--lt-warning-bg); color: var(--lt-warning-text); }
.hint-badge-stale { background: var(--lt-error-bg); color: var(--lt-error-text); }
.hint-textarea {
  width: 100%; min-height: 90px; font-family: var(--lt-font-mono);
  font-size: 12px; padding: 6px 8px; border: 1px solid var(--lt-border);
  border-radius: var(--lt-radius); resize: vertical; box-sizing: border-box;
  background: var(--lt-bg-container); margin-bottom: 6px;
}
.hint-actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.hint-save-btn {
  background: var(--lt-primary); color: #fff; border: none;
  border-radius: var(--lt-radius); padding: 4px 12px; font-size: 12px;
  cursor: pointer; font-weight: 500;
}
.hint-save-btn:hover  { background: var(--lt-primary-hover); }
.hint-save-btn:disabled { opacity: .55; cursor: default; }
.hint-regen-btn {
  background: transparent; border: 1px solid var(--lt-border); color: var(--lt-text-secondary);
  border-radius: var(--lt-radius); padding: 4px 10px; font-size: 12px; cursor: pointer;
}
.hint-regen-btn:hover { background: var(--lt-fill-tertiary); }
.hint-status { font-size: 11px; color: var(--muted); }
.hint-stale-warn {
  background: var(--lt-warning-bg); border: 1px solid var(--lt-warning-border); border-radius: var(--lt-radius);
  padding: 6px 10px; margin-bottom: 6px; font-size: 12px; color: var(--lt-warning-text);
}
/* Failed AI tasks (retry queue) in the assignment panel */
.asn-failed-tasks {
  margin-top: 10px; border: 1px solid var(--lt-error-border); background: var(--lt-error-bg);
  border-radius: var(--lt-radius-lg); padding: 8px 10px;
}
.aft-head { font-size: 12px; font-weight: 600; color: var(--lt-error-text); margin-bottom: 6px; }
.aft-row {
  display: flex; align-items: center; gap: 10px; padding: 5px 0;
  border-top: 1px solid var(--lt-error-border);
}
.aft-row:first-of-type { border-top: none; }
.aft-info { flex: 1; min-width: 0; display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px; }
.aft-kind {
  font-size: 11px; font-weight: 600; color: var(--lt-error-text); background: var(--lt-error-border);
  border-radius: var(--lt-radius-sm); padding: 1px 6px; text-transform: uppercase; letter-spacing: .03em;
}
.aft-title { font-size: 13px; color: var(--lt-text-secondary); }
.aft-err { font-size: 11px; color: var(--lt-error-text); font-family: var(--lt-font-mono); }
.btn.small.aft-retry { background: var(--lt-bg-container); border: 1px solid var(--lt-error-border); color: var(--lt-error-text); flex-shrink: 0; }
.btn.small.aft-retry:hover { background: var(--lt-error-bg); }
.btn.small.aft-retry:disabled { opacity: .55; cursor: default; }

/* ── Source-file editor with syntax highlighting ──────────────────────────
 * Overlay technique: a highlighted <pre> sits behind a transparent <textarea>
 * (see core/alpine.js → x-code-editor). The textarea keeps its size, border and
 * caret; its text is made transparent so the coloured code underneath shows
 * through. Typography/padding/border-width are copied from the textarea onto the
 * <pre> at runtime so every editor (.sf-editor, .fd-editor, #tutFileContent)
 * aligns exactly. Colours stay in the app's light theme. */
.code-editor { position: relative; }
.code-editor-input {
  position: relative; z-index: 1;
  background: transparent !important;
  color: transparent !important;
  caret-color: var(--lt-text);
  white-space: pre;
}
/* The selection is painted on the (transparent-text) textarea, which sits ON TOP
 * of the coloured <pre>. The tint MUST be translucent so the highlighted code
 * shows through; an opaque background (e.g. --lt-primary-bg) would hide the very
 * text being selected. Text stays transparent so the <pre>'s syntax colours remain
 * the visible glyphs. */
.code-editor-input::selection      { background: rgba(22,119,255,.30); color: transparent; }
.code-editor-input::-moz-selection { background: rgba(22,119,255,.30); color: transparent; }
.code-editor-pre {
  position: absolute; inset: 0; margin: 0; z-index: 0;
  overflow: hidden; pointer-events: none; box-sizing: border-box;
  background: var(--lt-bg-container); color: var(--lt-text);
  border: 1px solid transparent; border-radius: var(--lt-radius);
  white-space: pre;
}
.code-editor-pre code,
.code-editor-pre code.hljs {
  display: block; font: inherit; background: none; padding: 0;
  white-space: inherit; color: inherit;
}
/* Light syntax theme — scoped to the editor only, so chat code blocks keep
 * their own (dark) highlight.js theme. */
.code-editor-pre .hljs-comment,
.code-editor-pre .hljs-quote            { color: #6a737d; font-style: italic; }
.code-editor-pre .hljs-keyword,
.code-editor-pre .hljs-meta-keyword,
.code-editor-pre .hljs-doctag,
.code-editor-pre .hljs-meta             { color: #d73a49; }
.code-editor-pre .hljs-string,
.code-editor-pre .hljs-regexp,
.code-editor-pre .hljs-meta .hljs-string,
.code-editor-pre .hljs-char.escape_     { color: #032f62; }
.code-editor-pre .hljs-number,
.code-editor-pre .hljs-literal,
.code-editor-pre .hljs-symbol,
.code-editor-pre .hljs-bullet,
.code-editor-pre .hljs-link             { color: #005cc5; }
.code-editor-pre .hljs-title,
.code-editor-pre .hljs-title.function_,
.code-editor-pre .hljs-section,
.code-editor-pre .hljs-name             { color: #6f42c1; }
.code-editor-pre .hljs-type,
.code-editor-pre .hljs-built_in,
.code-editor-pre .hljs-title.class_,
.code-editor-pre .hljs-class .hljs-title { color: #005cc5; }
.code-editor-pre .hljs-attr,
.code-editor-pre .hljs-attribute,
.code-editor-pre .hljs-variable,
.code-editor-pre .hljs-template-variable,
.code-editor-pre .hljs-params           { color: var(--lt-text); }
.code-editor-pre .hljs-deletion         { color: #b31d28; background: #ffeef0; }
.code-editor-pre .hljs-addition         { color: #22863a; background: #f0fff4; }