/* =========================================================
   视觉层 v2 —— 「深墨 · 精工」
   只做外观，不改结构；全部在本层覆盖，便于回滚。
   ========================================================= */

/* 代码字体：JetBrains Mono（本地内置）+ 系统等宽回退
   中文注释回退到雅黑，避免缺字 */
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/vendor/fonts/jetbrains-mono-400.woff2") format("woff2");
}
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("/vendor/fonts/jetbrains-mono-500.woff2") format("woff2");
}
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("/vendor/fonts/jetbrains-mono-700.woff2") format("woff2");
}

:root {
  --font-ui: -apple-system, "Segoe UI Variable", "Segoe UI", "PingFang SC", "Microsoft YaHei UI", system-ui, sans-serif;
  --font-code: "JetBrains Mono", "Cascadia Code", Consolas, "Microsoft YaHei Mono", "Microsoft YaHei", monospace;
  --font-mono: var(--font-code);
  --r-sm: 6px; --r-md: 10px; --r-lg: 14px; --r-xl: 18px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: 160ms;
  --shadow-1: 0 1px 2px rgba(0, 0, 0, .38);
  --shadow-2: 0 10px 28px rgba(0, 0, 0, .46);
  --shadow-3: 0 28px 72px rgba(0, 0, 0, .58);
}

html[data-theme="black"] {
  --app-bg: #07080a;
  --chrome: #101216;
  --chrome-2: #15181d;
  --chrome-3: #0c0e12;
  --chrome-deep: #080a0d;
  --border: #1e2228;
  --border-2: #2a2f37;
  --text: #eef0f3;
  --text-dim: #b3bcc6;
  --text-mute: #808a95;
  --text-faint: #626c77;
  --accent: #6ee7b7;
  --accent-ink: #04231a;
  --accent-soft: #123129;
}

html[data-theme="green"] {
  --app-bg: #08120f;
  --chrome: #0f1b17;
  --chrome-2: #13221d;
  --chrome-3: #0b1512;
  --chrome-deep: #070f0d;
  --border: #1c2d26;
  --border-2: #273d34;
  --text: #e9efec;
  --text-dim: #b6c9bf;
  --text-mute: #82998e;
  --text-faint: #64786e;
  --accent: #59d99b;
  --accent-soft: #123026;
}

body {
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ---------- 顶栏 ---------- */
#topbar {
  height: 38px; padding: 0 12px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--chrome) 96%, transparent), color-mix(in srgb, var(--chrome-3) 92%, transparent));
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .03) inset;
}
#topbar .brand { font-weight: 600; letter-spacing: .3px; }
#topbar .dot-logo { box-shadow: 0 0 12px color-mix(in srgb, var(--accent) 55%, transparent); }

#boardTabs .btab {
  height: 24px; padding: 0 12px; border-radius: 999px;
  background: color-mix(in srgb, var(--chrome-2) 80%, transparent);
  border: 1px solid var(--border);
  transition: all var(--dur) var(--ease);
}
#boardTabs .btab:hover { border-color: var(--border-2); color: var(--text); }
#boardTabs .btab.on {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 8%, transparent);
}

/* ---------- 工具条 ---------- */
#tools {
  width: 48px; padding: 8px 6px; border-radius: var(--r-lg);
  background: color-mix(in srgb, var(--chrome) 88%, transparent);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-2), 0 1px 0 rgba(255, 255, 255, .04) inset;
}
.tbtn { width: 36px; height: 36px; border-radius: 9px; transition: all var(--dur) var(--ease); }
.tbtn:hover { transform: translateY(-1px); }
.tbtn.on {
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  border-color: color-mix(in srgb, var(--accent) 40%, transparent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 8%, transparent);
}

/* ---------- 面板 ---------- */
#panel {
  border-radius: var(--r-lg);
  background: linear-gradient(180deg, color-mix(in srgb, var(--chrome) 96%, transparent), color-mix(in srgb, var(--chrome-3) 98%, transparent));
  border: 1px solid var(--border);
  box-shadow: var(--shadow-3);
  backdrop-filter: blur(16px);
}
#panel h3 {
  margin: 14px 0 7px; padding-bottom: 5px;
  font-size: 11px; font-weight: 600; letter-spacing: .7px;
  color: var(--text-faint); text-transform: uppercase;
  border-bottom: 1px solid var(--border);
}
#panel h3:first-child { margin-top: 2px; }
#panelResize { width: 10px; left: -5px; border-radius: 6px; transition: background var(--dur) var(--ease); }
#panelResize:hover { background: color-mix(in srgb, var(--accent) 22%, transparent); }

/* ---------- 按钮 ---------- */
button {
  font-family: inherit;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
    border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), color var(--dur) var(--ease);
}
button:active { transform: translateY(1px) scale(.995); }
button:focus-visible, .ipt:focus-visible, select:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 1px;
}
button.primary {
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 92%, #ffffff 8%), var(--accent));
  color: var(--accent-ink); border: 1px solid color-mix(in srgb, var(--accent) 70%, #000);
  box-shadow: 0 6px 16px color-mix(in srgb, var(--accent) 22%, transparent), 0 1px 0 rgba(255, 255, 255, .25) inset;
  font-weight: 600;
}
button.primary:hover { filter: brightness(1.05); transform: translateY(-1px); }
button:not(.primary):not(.tbtn):not(.mini):not(.chip):not(.swatch):not(.wd) {
  background: var(--chrome-2); border: 1px solid var(--border-2); color: var(--text-dim);
}
button:not(.primary):not(.tbtn):not(.mini):not(.chip):not(.swatch):not(.wd):hover {
  color: var(--text); border-color: color-mix(in srgb, var(--accent) 35%, var(--border-2));
  background: color-mix(in srgb, var(--chrome-2) 70%, var(--accent) 6%);
}

/* ---------- 输入 ---------- */
.ipt, .lesson-select, select, input[type="number"], input[type="text"] {
  background: var(--chrome-deep); color: var(--text);
  border: 1px solid var(--border-2); border-radius: var(--r-sm);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.ipt:focus, select:focus, input:focus {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border-2));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 10%, transparent);
  outline: none;
}

/* ---------- 列表项 / 卡片 ---------- */
.row-item, .lcard, .cw-item, .pcard {
  border-radius: var(--r-md);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.row-item:hover, .lcard:hover, .cw-item:hover, .pcard:hover { transform: translateY(-1px); }

/* ---------- 浮窗 ---------- */
.win, .card {
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-3);
  background: var(--chrome-3);
}
.win-head, .card-head {
  height: 32px;
  background: linear-gradient(180deg, var(--chrome-2), color-mix(in srgb, var(--chrome-2) 88%, #000));
  border-bottom: 1px solid var(--border);
}

/* ---------- 状态栏 ---------- */
#statusbar {
  height: 26px;
  background: color-mix(in srgb, var(--chrome-3) 94%, transparent);
  border-top: 1px solid var(--border);
  backdrop-filter: blur(10px);
  letter-spacing: .2px;
}

/* ---------- 滚动条 ---------- */
* { scrollbar-width: thin; scrollbar-color: color-mix(in srgb, var(--border-2) 80%, transparent) transparent; }
*::-webkit-scrollbar { width: 9px; height: 9px; }
*::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--border-2) 85%, transparent);
  border-radius: 99px; border: 2px solid transparent; background-clip: content-box;
}
*::-webkit-scrollbar-thumb:hover { background: color-mix(in srgb, var(--accent) 45%, var(--border-2)); background-clip: content-box; }
*::-webkit-scrollbar-track { background: transparent; }

/* =========================================================
   代码编辑器（复刻参考站点的窗口外壳）
   ========================================================= */
.ide {
  border-radius: var(--r-lg); overflow: hidden;
  border: 1px solid var(--border);
  background: #0a0e11;
  box-shadow: var(--shadow-2);
}
.ide-bar {
  display: flex; align-items: center; flex-wrap: wrap; gap: 5px;
  min-height: 38px; padding: 5px 7px; row-gap: 4px;
  background: linear-gradient(180deg, #141a1e, #0f1417);
  border-bottom: 1px solid #1b2329;
  color: #8b9aa4; font-size: 11.5px; user-select: none;
}
.ide-dots { display: flex; gap: 5px; margin-right: 2px; }
.ide-dots i { width: 8px; height: 8px; border-radius: 50%; display: block; }
.ide-dots i:nth-child(1) { background: #e0605c; }
.ide-dots i:nth-child(2) { background: #d8b45c; }
.ide-dots i:nth-child(3) { background: #6fae6b; }
.ide-file { font-family: var(--font-code); font-size: 11.5px; color: #b9c7cf; display: none; }
body.ide-focus .ide-file { display: inline; }
.ide-state {
  font-size: 10px; padding: 1px 6px; white-space: nowrap; display: none; border-radius: 999px;
  border: 1px solid transparent; color: transparent;
}
.ide-state.on { color: #9fd8ff; border-color: rgba(120, 180, 255, .35); background: rgba(120, 180, 255, .08); }
.ide-state.ok { color: #7ee2b8; border-color: rgba(126, 226, 184, .35); background: rgba(126, 226, 184, .08); }
.ide-state.err { color: #ff9b9b; border-color: rgba(255, 120, 120, .35); background: rgba(255, 120, 120, .08); }
.ide-tools { display: flex; gap: 2px; }
.mini {
  height: 24px; padding: 0 5px; border-radius: 6px; cursor: pointer;
  border: 1px solid transparent; background: transparent; color: #8b9aa4;
  font-size: 11px; font-family: inherit;
}
.mini:hover { background: #1b242a; color: var(--accent); }
.ide-lang {
  font-family: var(--font-mono); font-size: 10.5px; padding: 2px 10px;
  border-radius: 999px; border: 1px solid #24313a; color: #9fb3bf;
  background: #0f1417;
  display: none;
}
.ide-lang i { font-style: normal; opacity: .6; margin-left: 3px; }
body.ide-focus .ide-lang { display: inline-flex; }
body.ide-focus .ide-state { display: inline-block; }
#editor { height: clamp(220px, 34vh, 400px); }

.ed-status {
  display: flex; align-items: center; flex-wrap: wrap; gap: 4px 8px; padding: 3px 9px;
  row-gap: 2px;
  font-family: var(--font-code); font-size: 10.5px; color: var(--text-faint);
  background: #0d1215; border-top: 1px solid #1b2329;
}
.ed-status .ed-dim { opacity: .8; display: none; }
body.ide-focus .ed-status .ed-dim { display: inline; }
.ed-status .ed-sel { color: var(--accent); }

/* 专注模式 */
body.ide-focus::before {
  content: ""; position: fixed; inset: 0; z-index: 790;
  background: rgba(3, 5, 7, .74); backdrop-filter: blur(4px);
}
/* 面板的 backdrop-filter 会给 fixed 子元素造包含块，专注模式下必须去掉，
   否则编辑器"全屏"只会铺满面板那一小块（看起来像没生效）。 */
body.ide-focus #panel {
  backdrop-filter: none; -webkit-backdrop-filter: none;
  z-index: 810;
}
body.ide-focus .ide {
  position: fixed; inset: 28px; z-index: 820;
  box-shadow: var(--shadow-3);
}
body.ide-focus #editor { height: calc(100vh - 28px * 2 - 40px - 26px); }

/* =========================================================
   评测面板
   ========================================================= */
.verdict {
  margin-top: 8px; border-radius: var(--r-md); overflow: hidden;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, color-mix(in srgb, var(--chrome-2) 92%, transparent), var(--chrome-3));
}
.verdict[hidden] { display: none; }
.vd-head { display: flex; align-items: center; gap: 8px; padding: 10px 12px 8px; }
.vd-badge {
  font-size: 12px; font-weight: 700; letter-spacing: .6px;
  padding: 3px 10px; border-radius: 6px; font-family: var(--font-mono);
}
.vd-badge.ac { color: #7ee2b8; background: rgba(126, 226, 184, .12); border: 1px solid rgba(126, 226, 184, .35); }
.vd-badge.wa { color: #ffb27a; background: rgba(255, 178, 122, .12); border: 1px solid rgba(255, 178, 122, .35); }
.vd-badge.ce { color: #ff9b9b; background: rgba(255, 155, 155, .12); border: 1px solid rgba(255, 155, 155, .35); }
.vd-badge.info { color: #9fd8ff; background: rgba(159, 216, 255, .12); border: 1px solid rgba(159, 216, 255, .35); }
.vd-note { font-size: 12px; color: var(--text-dim); }
.vd-stats { font-size: 11px; color: var(--text-faint); font-family: var(--font-mono); }

.vd-track { height: 3px; background: #171f24; }
.vd-track i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, #7ee2b8, #3ecf8e); transition: width 320ms var(--ease); }
.vd-track i.wa { background: linear-gradient(90deg, #ffb27a, #e5484d); }

.vd-cases { display: flex; flex-direction: column; gap: 4px; padding: 10px 12px 12px; max-height: 190px; overflow: auto; }
.vd-case {
  display: flex; align-items: center; gap: 8px;
  font-size: 11.5px; padding: 5px 9px; border-radius: 6px;
  background: #10171b; border: 1px solid #1d262b;
  font-family: var(--font-mono);
}
.vd-case.pass { border-color: rgba(126, 226, 184, .22); }
.vd-case.fail { border-color: rgba(255, 155, 155, .28); }
.vd-case .vd-name { color: var(--text-mute); }
.vd-case .vd-res { margin-left: auto; }
.vd-case.pass .vd-res { color: #7ee2b8; }
.vd-case.fail .vd-res { color: #ff9b9b; }
.vd-case .vd-io { color: var(--text-faint); }

.vd-ce { border-top: 1px solid var(--border); }
.vd-ce-head { display: flex; align-items: center; gap: 8px; padding: 8px 12px; font-size: 11.5px; color: var(--text-dim); }
.vd-ce pre {
  margin: 0; padding: 8px 12px 12px; max-height: 180px; overflow: auto;
  font-family: var(--font-mono); font-size: 11px; line-height: 1.55;
  color: #ffb4b4; white-space: pre-wrap;
}

.raw-out { margin-top: 8px; font-size: 11.5px; color: var(--text-faint); }
.raw-out summary { cursor: pointer; padding: 3px 0; }
.raw-out .out { max-height: 180px; }

/* =========================================================
   快捷键弹窗
   ========================================================= */
.modal {
  position: fixed; inset: 0; z-index: 2000;
  display: flex; align-items: center; justify-content: center;
  background: rgba(3, 5, 7, .72); backdrop-filter: blur(4px);
}
.modal[hidden] { display: none; }
.modal-card {
  width: min(460px, 92vw); max-height: 86vh; display: flex; flex-direction: column;
  border-radius: var(--r-lg); overflow: hidden;
  background: var(--chrome-3); border: 1px solid var(--border-2);
  box-shadow: var(--shadow-3);
}
.modal-card header { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 12.5px; }
.kbd-grid {
  display: flex; flex-direction: column; gap: 2px;
  padding: 10px 14px 14px; overflow: auto;
  font-size: 12px; color: var(--text-dim);
}
.kbd-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 6px 0; border-bottom: 1px dashed color-mix(in srgb, var(--border) 60%, transparent); }
.kbd-row:last-child { border-bottom: 0; }
.kbd-keys { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; justify-content: flex-end; }
kbd {
  font-family: var(--font-mono); font-size: 10.5px; padding: 2px 7px;
  border-radius: 5px; background: #151d22; border: 1px solid #26333b;
  border-bottom-width: 2px; color: #cfdbe2;
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0ms !important; animation-duration: 0ms !important; }
}

/* ---------- 分段控件（布局） ---------- */
.layouts { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.layouts button {
  height: 30px; border-radius: 8px; font-size: 12px;
  background: var(--chrome-deep); border: 1px solid var(--border); color: var(--text-mute);
}
.layouts button:hover { color: var(--text); border-color: var(--border-2); }
.layouts button.on {
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  border-color: color-mix(in srgb, var(--accent) 42%, transparent);
  color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 7%, transparent);
}

/* ---------- 面板里的选择与卡片间距 ---------- */
#panel .lesson-select, #panel select { width: 100%; height: 28px; padding: 0 8px; font-size: 12px; }
#panel .row { gap: 6px; }
#panel .row > button { flex: 1 1 0; min-width: 0; }

/* ---------- 课包卡片更紧凑 ---------- */
.lcard { padding: 7px 9px; }
.lcard.on { box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 8%, transparent); }
/* ---------- 顶栏胶囊 ---------- */
#topbar .tag {
  height: 22px; display: inline-flex; align-items: center;
  padding: 0 10px; border-radius: 999px;
  background: color-mix(in srgb, var(--chrome-2) 70%, transparent);
  border: 1px solid var(--border);
  color: var(--text-mute); font-size: 11.5px;
}
#topbar .tag.ghost { background: transparent; border-color: transparent; color: var(--text-faint); }
#topbar .tag.timer {
  font-family: var(--font-mono); font-variant-numeric: tabular-nums;
  color: var(--accent); border-color: color-mix(in srgb, var(--accent) 30%, var(--border));
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  letter-spacing: .5px;
}
#topbar .theme-switch { display: flex; gap: 5px; align-items: center; padding: 0 4px; }
#topbar .theme-switch .sw {
  width: 16px; height: 16px; border-radius: 50%; padding: 0; cursor: pointer;
  border: 1px solid var(--border-2); background: #101418;
}
#topbar .theme-switch .sw[data-theme-set="green"] { background: #16352b; }
#topbar .theme-switch .sw.on {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent);
}

/* ---------- 面板小标题前的点 ---------- */
#panel h3::before {
  content: ""; display: inline-block; width: 5px; height: 5px; margin-right: 7px;
  border-radius: 50%; background: color-mix(in srgb, var(--accent) 70%, transparent);
  vertical-align: middle; transform: translateY(-1px);
}

/* ---------- 黑板暗角（更沉、更有屏幕感） ---------- */
#board::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(120% 90% at 50% 40%, transparent 55%, rgba(0, 0, 0, .45) 100%);
  z-index: 1;
}

/* ---------- 编辑器：版本胶囊 / 居中工具 / 历史提交 / 操作行 ---------- */
.ide-compiler {
  font-family: var(--font-mono); font-size: 10.5px;
  padding: 2px 9px; border-radius: 999px;
  border: 1px solid #3a3020; background: #171309; color: #d9c9a4;
  white-space: nowrap;
}
.ide-tools { margin-left: auto; display: flex; align-items: center; gap: 2px; flex-wrap: nowrap; }

.solve-actions {
  display: flex; align-items: center; gap: 8px; margin-top: 8px;
  flex-wrap: wrap;
}
.solve-actions .status { color: var(--text-mute); font-size: 11.5px; }
.solve-actions .kbd-hint {
  margin-left: auto; font-size: 10.5px; color: var(--text-faint);
  font-family: var(--font-mono);
}
.solve-actions button.ghost {
  background: var(--chrome-deep); border: 1px solid var(--border-2); color: var(--text-dim);
}
.solve-actions button.ghost:hover { color: var(--text); border-color: color-mix(in srgb, var(--accent) 45%, var(--border-2)); }
button.primary.gold {
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 92%, #ffffff 8%), var(--accent)) !important;
  color: var(--accent-ink) !important;
  border-color: color-mix(in srgb, var(--accent) 70%, #000) !important;
  box-shadow: 0 6px 16px color-mix(in srgb, var(--accent) 22%, transparent), 0 1px 0 rgba(255, 255, 255, .25) inset;
}

/* 操作行：窄面板下按钮一行放下，状态单独一行 */
.solve-actions { flex-wrap: wrap; row-gap: 6px; }
.solve-actions .kbd-hint { display: none; }
.solve-actions .status { order: 9; width: 100%; }
.solve-actions button[data-testid="submit"] { margin-left: auto; }
body.ide-focus .solve-actions .kbd-hint { display: inline; margin-left: auto; }
body.ide-focus .solve-actions .status { width: auto; order: 0; }

/* ---------- 课包：两份课件的切换 ---------- */
.doc-switch { display: inline-flex; gap: 2px; margin-right: 4px; }
.doc-switch[hidden] { display: none; }
.doc-btn {
  height: 20px; padding: 0 8px; border-radius: 5px; cursor: pointer;
  background: transparent; border: 1px solid var(--border-2);
  color: var(--text-mute); font-size: 10.5px;
}
.doc-btn.on {
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  color: var(--accent);
}
.field-label {
  display: block; margin: 6px 0 3px;
  font-size: 10.5px; color: var(--text-faint); letter-spacing: .3px;
}

/* ---------- 课件窗口：支持纵向滚动（适应宽度） ---------- */
#cwWin .win-body { overflow: auto; align-items: flex-start; justify-content: center; }
#cwWin .page-wrap { flex: 0 0 auto; margin: 0 auto; }

/* =========================================================
   代码编译器（独立浮层）
   ========================================================= */
.ide-sheet {
  position: fixed; top: 76px; right: 340px;
  width: min(720px, 56vw); height: min(720px, 80vh);
  z-index: 700; display: flex; flex-direction: column;
  padding: 0 12px 10px;
  background: linear-gradient(180deg, color-mix(in srgb, var(--chrome) 97%, transparent), var(--chrome-3));
  border: 1px solid var(--border-2); border-radius: var(--r-lg);
  box-shadow: var(--shadow-3);
  backdrop-filter: blur(18px);
  resize: both; overflow: hidden;
  min-width: 520px; min-height: 380px;
}
.ide-sheet.t-ide { top: 96px; right: 360px; z-index: 710; }
.ide-sheet.demo-win { top: auto; left: 24px; right: auto; bottom: 46px; z-index: 705; width: min(520px, 40vw); height: min(460px, 54vh); }
.ide-grip { color: var(--text-faint); cursor: move; letter-spacing: 1px; }
.ide-sheet-head { cursor: move; }
.ide-sheet-head .chk { cursor: pointer; }
.ide-sheet[hidden] { display: none; }
.ide-sheet-head {
  display: flex; align-items: center; gap: 9px;
  padding: 9px 2px; border-bottom: 1px solid var(--border);
  font-size: 12.5px; user-select: none;
}
.ide-sheet-sub { font-size: 11px; color: var(--text-faint); }
.ide-sheet-body { flex: 1 1 auto; overflow: auto; padding: 10px 2px 18px; }
.ide-sheet #editor, .ide-sheet #t-editor, .ide-sheet #demoCode { flex: 1 1 auto; min-height: 160px; }
.ide-sheet .run-out { max-height: 150px; }
.ide-sheet .ide { flex: 1 1 auto; display: flex; flex-direction: column; min-height: 0; }
.ide-sheet .verdict { margin-top: 6px; }

.t-out {
  margin: 6px 0 0; padding: 8px 10px; max-height: 160px; overflow: auto;
  border-radius: var(--r-sm); border: 1px solid var(--border);
  background: var(--chrome-deep); color: var(--text-dim);
  font-family: var(--font-mono); font-size: 11.5px; white-space: pre-wrap;
}
.t-out[hidden] { display: none; }


/* 教师编译器 / 演示窗：内容撑满窗口 */
.t-ide .ide-sheet-body,
.demo-win .ide-sheet-body { display: flex; flex-direction: column; min-height: 0; }
.t-ide .ide-sheet-body > .ide,
.demo-win .ide-sheet-body > .ide { flex: 1 1 auto; min-height: 0; }
.t-ide .solve-actions, .t-ide .t-out { flex: 0 0 auto; }

/* ---------- 编译器专注模式（任意一侧窗口） ---------- */
.ide-sheet.win-focus {
  top: 24px !important; left: 24px !important; right: 24px !important; bottom: 24px !important;
  width: auto !important; height: auto !important; z-index: 860;
}
body.sheet-focus::before {
  content: ""; position: fixed; inset: 0; z-index: 850;
  background: rgba(3, 5, 7, .74); backdrop-filter: blur(4px);
}

/* 教师窗口里的 IDE 也铺满 */
.t-ide.win-focus .ide-sheet-body { padding: 12px 4px 6px; }

/* ---------- 标准输入（cin） ---------- */
.stdin-box { margin-top: 8px; border-top: 1px solid var(--border); padding-top: 6px; }
.stdin-box > summary {
  cursor: pointer; font-size: 11px; color: var(--text-mute);
  padding: 2px 0; user-select: none;
}
.stdin-box > summary::marker { color: var(--text-faint); }
.stdin {
  width: 100%; margin-top: 5px; padding: 6px 8px; resize: vertical;
  min-height: 46px; max-height: 140px;
  font-family: var(--font-code); font-size: 12px; line-height: 1.5;
  color: var(--text); background: var(--chrome-deep);
  border: 1px solid var(--border-2); border-radius: var(--r-sm);
}
.stdin:focus { outline: none; border-color: color-mix(in srgb, var(--accent) 55%, var(--border-2)); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 10%, transparent); }

/* ---------- 白板垂直滚动条（一页 = 50 屏） ---------- */
.scroll-rail {
  position: fixed; width: 8px; z-index: 505;
  border-radius: 99px;
  background: color-mix(in srgb, var(--chrome-2) 45%, transparent);
  opacity: .5; transition: opacity 160ms var(--ease);
  border: 1px solid color-mix(in srgb, var(--border) 60%, transparent);
}
.scroll-rail:hover { opacity: 1; }
.scroll-rail.off { display: none; }
.scroll-thumb {
  width: 100%; border-radius: 99px;
  background: color-mix(in srgb, var(--text-faint) 65%, transparent);
  cursor: grab;
}
.scroll-thumb:hover { background: var(--accent); }
.scroll-thumb:active { cursor: grabbing; }

/* ---------- 课件窗口：底栏重排 + 连续滚动 ---------- */
.cw-foot { gap: 3px; padding: 4px 6px; }
.cw-foot .ico.big {
  width: 30px; height: 26px; font-size: 13px;
  display: inline-flex; align-items: center; justify-content: center;
}
.cw-foot .ico.big.play { color: var(--accent); }
.cw-foot .ico.big.play.on {
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
}
.cw-foot .pager { margin-left: 4px; }

.pdf-stack {
  position: absolute; inset: 0; overflow-y: auto; overflow-x: hidden;
  padding: 10px 8px; display: flex; flex-direction: column; gap: 10px;
  scroll-behavior: smooth;
  background: #0b0d10;
}
.pdf-stack[hidden] { display: none; }
.pdf-page-item { position: relative; flex: 0 0 auto; }
.pdf-page-item > canvas:first-child {
  display: block; width: 100%; height: auto;
  border-radius: 4px; background: #fff;
}
.pdf-page-item #pageInk {
  position: absolute; left: 0; top: 0;
  background: transparent;   /* 批注层必须透明，否则会盖住 PDF */
}

/* 连续滚动层不能盖住底栏：让 win-body 成为定位容器，底栏提升层级 */
#cwWin .win-body { position: relative; }
#cwWin .cw-foot { position: relative; z-index: 3; }

/* ---------- 课件页缩略图 ---------- */
.cw-thumbs {
  position: absolute; inset: 0; z-index: 6;
  display: flex; flex-direction: column;
  background: color-mix(in srgb, var(--chrome) 94%, transparent);
  backdrop-filter: blur(10px);
}
.cw-thumbs[hidden] { display: none !important; }
.cw-thumbs-head {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 10px; border-bottom: 1px solid var(--border);
  font-size: 12px; flex: 0 0 auto;
}
.cw-thumb-grid {
  flex: 1; overflow: auto; padding: 10px;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr));
  gap: 8px; align-content: start;
}
.cw-thumb {
  position: relative; padding: 3px; border-radius: 6px; cursor: pointer;
  border: 1px solid var(--border); background: #0d1215;
}
.cw-thumb canvas { display: block; width: 100%; height: auto; border-radius: 3px; background: #fff; }
.cw-thumb .n { position: absolute; right: 5px; bottom: 4px; font-size: 10px; color: #dbe7ee; text-shadow: 0 1px 2px #000; font-family: var(--font-mono); }
.cw-thumb.on { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.cw-thumb:hover { border-color: color-mix(in srgb, var(--accent) 60%, var(--border)); }

/* ---------- 原始输出（stdout / stderr / 报错 / 栈） ---------- */
.run-out-head { display: flex; align-items: baseline; gap: 8px; margin-top: 10px; font-size: 12px; }
.run-out-head b { font-size: 12.5px; color: var(--text); }
.run-out {
  margin: 6px 0 0; padding: 8px 10px; max-height: 240px; overflow: auto;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--chrome-deep); color: var(--text-dim);
  font-family: var(--font-mono); font-size: 11.5px; line-height: 1.5;
  white-space: pre-wrap; word-break: break-word;
}
.t-ide .run-out { max-height: 170px; }

/* ---------- 浮窗缩放把手（八向） ---------- */
.rz { position: absolute; z-index: 40; }
.rz-n { top: -3px; left: 10px; right: 10px; height: 7px; cursor: ns-resize; }
.rz-s { bottom: -3px; left: 10px; right: 10px; height: 7px; cursor: ns-resize; }
.rz-e { right: -3px; top: 10px; bottom: 10px; width: 7px; cursor: ew-resize; }
.rz-w { left: -3px; top: 10px; bottom: 10px; width: 7px; cursor: ew-resize; }
.rz-ne { right: -4px; top: -4px; width: 14px; height: 14px; cursor: nesw-resize; }
.rz-nw { left: -4px; top: -4px; width: 14px; height: 14px; cursor: nwse-resize; }
.rz-se { right: -4px; bottom: -4px; width: 15px; height: 15px; cursor: nwse-resize; }
.rz-sw { left: -4px; bottom: -4px; width: 14px; height: 14px; cursor: nesw-resize; }
.rz-se::after {
  content: ""; position: absolute; right: 3px; bottom: 3px; width: 6px; height: 6px;
  border-right: 2px solid var(--text-faint); border-bottom: 2px solid var(--text-faint);
  border-radius: 1px; opacity: .7;
}
body.resizing { user-select: none; }
body.resizing iframe, body.resizing canvas { pointer-events: none; }

/* ---------- 课堂文件夹 ---------- */
.folder-hint { font-size: 11px; line-height: 1.5; margin: 2px 0 6px; }
.folder-list { display: flex; flex-direction: column; gap: 4px; margin-bottom: 6px; }
.folder-item {
  position: relative; display: flex; align-items: center; gap: 7px;
  padding: 6px 8px; border-radius: var(--r-sm); cursor: pointer;
  background: var(--chrome-deep); border: 1px solid var(--border);
  transition: border-color 140ms, background 140ms;
}
.folder-item:hover { border-color: var(--border-2); background: var(--chrome-2); }
.folder-item.on { border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.folder-item .kind {
  flex: 0 0 auto; font-size: 9.5px; font-weight: 700; letter-spacing: .04em;
  padding: 1px 5px; border-radius: 4px; font-family: var(--font-code);
}
.folder-item .kind { background: rgba(108,182,255,.16); color: #8cc9ff; }
.folder-item.ppt .kind { background: rgba(255,155,92,.16); color: #ffb37a; }
.folder-item b {
  flex: 1 1 auto; min-width: 0; font-weight: 500; font-size: 12px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.folder-item .lmeta { flex: 0 0 auto; font-size: 10.5px; color: var(--text-faint); font-family: var(--font-code); }
.cw-del {
  flex: 0 0 auto; width: 18px; height: 18px; padding: 0; line-height: 1;
  border-radius: 5px; background: transparent; border: 1px solid transparent;
  color: var(--text-faint); cursor: pointer; opacity: 0;
}
.folder-item:hover .cw-del { opacity: 1; }
.cw-del:hover { color: var(--danger); border-color: var(--danger); }
.folder-upload { gap: 6px; }
.folder-upload button { flex: 1; }

/* 课包高级设置折叠 */
.pack-details { margin-top: 4px; }
.pack-details > summary {
  cursor: pointer; font-size: 11.5px; color: var(--text-mute); padding: 4px 0;
}
.pack-details[open] > summary { color: var(--text); margin-bottom: 4px; }

/* ---------- 课堂文件夹（云盘式窗口） ---------- */
.files-win { width: 760px; height: 520px; left: 220px; top: 120px; z-index: 780; }
.files-body { display: flex; min-height: 0; flex: 1; }
.files-side {
  flex: 0 0 150px; display: flex; flex-direction: column; gap: 2px;
  padding: 8px 6px; border-right: 1px solid var(--border); background: var(--chrome-deep);
}
.fside {
  text-align: left; padding: 7px 9px; border-radius: var(--r-sm); font-size: 12px;
  background: transparent; border: 1px solid transparent; color: var(--text-mute); cursor: pointer;
}
.fside:hover { background: var(--chrome-2); color: var(--text); }
.fside.on { background: color-mix(in srgb, var(--accent) 10%, transparent); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }
.fside-sep { height: 1px; background: var(--border); margin: 6px 2px; }
.files-usage { margin-top: auto; font-size: 10.5px; color: var(--text-faint); padding: 4px 9px; font-family: var(--font-code); }

.files-main { flex: 1; min-width: 0; display: flex; flex-direction: column; padding: 8px 10px; }
.files-tools { display: flex; align-items: center; gap: 6px; margin-bottom: 8px; }
.files-tools .primary { padding: 5px 10px; }
.files-status {
  margin: 0 0 8px; padding: 5px 8px; border-radius: var(--r-sm);
  font-size: 11px; line-height: 1.4;
  color: var(--text-dim); background: color-mix(in srgb, var(--accent) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
}
.files-status[data-state="error"] {
  color: #ffb4b4; background: rgba(255, 80, 80, .10); border-color: rgba(255, 80, 80, .35);
}
.files-head-row {
  display: grid; grid-template-columns: 1fr 78px 108px 28px;
  gap: 6px; padding: 4px 8px; font-size: 10.5px; color: var(--text-faint);
  border-bottom: 1px solid var(--border);
}
.files-list { flex: 1; min-height: 0; overflow-y: auto; }
.file-row {
  display: grid; grid-template-columns: 26px 1fr 78px 108px 28px;
  align-items: center; gap: 6px; padding: 7px 8px; border-radius: var(--r-sm);
  cursor: pointer; border: 1px solid transparent;
}
.file-row:hover { background: var(--chrome-2); }
.file-row.on { background: color-mix(in srgb, var(--accent) 9%, transparent); border-color: color-mix(in srgb, var(--accent) 35%, transparent); }
.file-row .fico {
  width: 20px; height: 20px; border-radius: 5px; display: inline-flex;
  align-items: center; justify-content: center; font-size: 11px; font-family: var(--font-code);
}
.file-row .fico.pdf { background: rgba(108,182,255,.16); color: #8cc9ff; }
.file-row .fico.ppt { background: rgba(255,155,92,.16); color: #ffb37a; }
.file-row .fname {
  min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12.5px;
}
.file-row .fsize, .file-row .fdate { font-size: 10.5px; color: var(--text-faint); font-family: var(--font-code); }
.file-row .fmore {
  width: 20px; height: 20px; padding: 0; border-radius: 5px; line-height: 1;
  background: transparent; border: 1px solid transparent; color: var(--text-faint);
  cursor: pointer; opacity: 0;
}
.file-row:hover .fmore { opacity: 1; }
.file-row .fmore:hover { color: var(--danger); border-color: var(--danger); }
.files-empty { padding: 26px 10px; text-align: center; font-size: 12px; }
.files-drop {
  margin-top: 6px; padding: 8px; text-align: center; font-size: 11px;
  border: 1px dashed var(--border-2); border-radius: var(--r-sm); color: var(--text-faint);
}
.files-win.drop { outline: 2px dashed color-mix(in srgb, var(--accent) 60%, transparent); outline-offset: -3px; }
.files-win.drop .files-drop { color: var(--accent); border-color: var(--accent); }

/* ---------- 浮窗折叠坞 ---------- */
.win-dock { position: fixed; right: 18px; bottom: 54px; z-index: 900; }
.dock-bubble {
  position: relative; width: 46px; height: 46px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: color-mix(in srgb, var(--chrome) 92%, transparent);
  border: 1px solid var(--border-2); color: var(--text-mute);
  cursor: pointer; box-shadow: 0 6px 20px rgba(0,0,0,.35); backdrop-filter: blur(8px);
}
.dock-bubble:hover { color: var(--accent); border-color: var(--accent); }
.dock-ico { font-size: 16px; }
.dock-count {
  position: absolute; top: -3px; right: -3px; min-width: 17px; height: 17px;
  border-radius: 9px; background: var(--accent); color: #07251a;
  font-size: 10px; font-weight: 700; display: flex; align-items: center; justify-content: center;
  padding: 0 4px;
}
.dock-menu {
  position: absolute; right: 0; bottom: 56px; width: 210px;
  background: var(--chrome); border: 1px solid var(--border-2); border-radius: 10px;
  padding: 6px; box-shadow: 0 12px 32px rgba(0,0,0,.45);
}
.dock-items { display: flex; flex-direction: column; gap: 2px; max-height: 220px; overflow-y: auto; }
.dock-item {
  display: flex; align-items: center; gap: 8px; width: 100%; text-align: left;
  padding: 7px 8px; border-radius: 6px; background: transparent; border: 1px solid transparent;
  color: var(--text); font-size: 12px; cursor: pointer;
}
.dock-item:hover { background: var(--chrome-2); border-color: var(--border-2); }
.di-ico { width: 16px; text-align: center; opacity: .8; }
.di-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dock-sep { height: 1px; background: var(--border); margin: 5px 2px; }
.dock-act {
  display: block; width: 100%; text-align: left; padding: 7px 8px; border-radius: 6px;
  background: transparent; border: 1px solid transparent; color: var(--text-mute);
  font-size: 12px; cursor: pointer;
}
.dock-act:hover { background: var(--chrome-2); color: var(--text); }
.dock-btn { font-size: 11px; opacity: .55; }
.dock-btn:hover { opacity: 1; }

/* hidden 必须压过 .win 的 display:flex */
.win[hidden], .files-win[hidden], .win-dock[hidden], .dock-menu[hidden] { display: none !important; }

/* ---------- 顶栏用户头像 ---------- */
.user-chip { display: flex; align-items: center; gap: 8px; padding: 3px 8px 3px 3px; border-radius: 999px; margin-left: 4px; }
.user-chip:hover { background: var(--chrome-2); }
.avatar {
  width: 26px; height: 26px; border-radius: 50%; display: inline-flex;
  align-items: center; justify-content: center; font-size: 12px; font-weight: 600;
  color: #0b1f18; background: linear-gradient(135deg, #6ee7b7, #38bdf8);
  border: 1px solid rgba(255,255,255,.25);
}
.user-meta { display: flex; flex-direction: column; line-height: 1.15; }
.user-meta b { font-size: 12px; font-weight: 600; color: var(--text); }
.user-meta i { font-style: normal; font-size: 10px; color: var(--text-faint); }

/* ---------- 媒体浮窗 ---------- */
.media-win { width: 480px; height: 154px; left: 260px; top: 160px; z-index: 785; }
.media-win[hidden] { display: none !important; }
.media-body { flex: 1; display: flex; align-items: center; justify-content: center; padding: 8px 12px; min-height: 0; }
.media-body audio { width: 100%; height: 54px; }
.media-body video { width: 100%; max-height: 100%; border-radius: 6px; background: #000; }
.file-row .fico.audio { background: rgba(199,125,255,.16); color: #d5a4ff; }
.file-row .fico.video { background: rgba(99,230,168,.16); color: #7fe3bb; }
.files-tools .primary { white-space: nowrap; }

/* 橡皮大小（仅橡皮工具显示） */
.teraser { display: none; flex-direction: column; align-items: center; gap: 6px; padding: 4px 0; }
body.tool-eraser .teraser { display: flex; }
.teraser .er {
  width: calc(var(--e) + 6px); height: calc(var(--e) + 6px);
  max-width: 38px; max-height: 38px; min-width: 18px; min-height: 18px;
  border-radius: 50%; padding: 0; cursor: pointer;
  border: 1px solid var(--border-2); background: rgba(255,255,255,.10);
}
.teraser .er:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); }
.teraser .er.on { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); background: color-mix(in srgb, var(--accent) 22%, transparent); }

/* ---------- 橡皮自定义光标 ---------- */
#eraserRing {
  position: fixed; z-index: 1300; width: 36px; height: 36px;
  margin: -18px 0 0 -18px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,.92);
  box-shadow: 0 0 0 1px rgba(0,0,0,.55), inset 0 0 0 1px rgba(0,0,0,.35);
  background: radial-gradient(circle, rgba(255,255,255,.10) 0 55%, rgba(255,255,255,.02) 56% 100%);
  pointer-events: none; display: none;
}
#eraserRing.on { display: block; }
#eraserRing.erase { width: 30px; height: 30px; margin: -15px 0 0 -15px; border-color: var(--accent); background: rgba(255,255,255,.18); }

/* ---------- 课堂公告条 ---------- */
#announceBar {
  position: fixed; top: 64px; left: 50%; transform: translateX(-50%);
  z-index: 1400; max-width: min(720px, 86vw);
  padding: 9px 18px; border-radius: 999px;
  background: linear-gradient(135deg, rgba(56,189,248,.95), rgba(99,230,168,.95));
  color: #06222b; font-size: 15px; font-weight: 700; letter-spacing: .02em;
  box-shadow: 0 10px 30px rgba(0,0,0,.35);
  animation: announce-in .18s ease-out;
}
#announceBar[hidden] { display: none !important; }
@keyframes announce-in { from { opacity: 0; transform: translate(-50%, -8px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ---------- 工具箱 ---------- */
.toolbox-win { width: 560px; height: 430px; left: 220px; top: 90px; z-index: 790; }
.toolbox-win[hidden] { display: none !important; }
.toolbox-grid {
  flex: 1; display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 10px; padding: 14px; overflow-y: auto; align-content: start;
}
.tb-tile {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 7px; min-height: 82px; padding: 10px 6px;
  border-radius: 12px; border: 1px solid var(--border);
  background: color-mix(in srgb, var(--panel) 88%, #fff 4%);
  color: var(--text); cursor: pointer; transition: .12s ease;
}
.tb-tile:hover { border-color: var(--accent); transform: translateY(-1px); background: color-mix(in srgb, var(--panel) 80%, var(--accent) 10%); }
.tb-tile:active { transform: translateY(0); }
.tb-tile.disabled { opacity: .38; cursor: not-allowed; }
.tb-tile.disabled:hover { border-color: var(--border); transform: none; background: color-mix(in srgb, var(--panel) 88%, #fff 4%); }
.tb-ico { font-size: 26px; line-height: 1; filter: saturate(1.05); }
.tb-name { font-size: 11.5px; color: var(--text-dim); text-align: center; line-height: 1.2; }
.toolbox-toast {
  margin: 0 14px 12px; padding: 8px 12px; border-radius: 8px;
  font-size: 12px; color: var(--text); background: color-mix(in srgb, var(--accent) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
}
.toolbox-toast[hidden] { display: none !important; }

/* ---------- 定时器 ---------- */
.timer-win { width: 330px; height: 230px; left: 320px; top: 140px; z-index: 786; }
.timer-win[hidden] { display: none !important; }
.timer-body { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; padding: 12px; }
.timer-display { font-family: var(--font-code); font-size: 46px; font-weight: 700; letter-spacing: .04em; color: var(--text); }
.timer-display.over { color: #ff8080; }
.timer-presets, .timer-actions { display: flex; gap: 6px; }
.timer-presets button, .timer-actions button {
  padding: 5px 10px; border-radius: 7px; border: 1px solid var(--border);
  background: transparent; color: var(--text-dim); font-size: 11.5px; cursor: pointer;
}
.timer-presets button.on { border-color: var(--accent); color: var(--accent); }
.timer-actions .primary { background: var(--accent); border-color: var(--accent); color: #06222b; font-weight: 700; }

/* ---------- 浏览器 ---------- */
.web-win { width: 760px; height: 520px; left: 180px; top: 70px; z-index: 792; }
.web-win[hidden] { display: none !important; }
.web-bar { display: flex; gap: 6px; padding: 8px 10px; }
.web-bar .ipt { flex: 1; }
.web-win iframe { flex: 1; width: 100%; border: 0; background: #fff; }
.web-hint { padding: 4px 10px 8px; font-size: 10.5px; color: var(--text-faint); }

/* ---------- 屏幕共享 ---------- */
.share-win { width: 620px; height: 420px; left: 220px; top: 110px; z-index: 788; }
.share-win[hidden] { display: none !important; }
.share-body { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; padding: 12px; min-height: 0; }
.share-body video { width: 100%; flex: 1; min-height: 0; object-fit: contain; background: #000; border-radius: 8px; }
.share-hint { font-size: 11px; color: var(--text-faint); text-align: center; }

/* ---------- 排行榜 ---------- */
.leader-win { width: 420px; height: 460px; left: 300px; top: 100px; z-index: 786; }
.leader-win[hidden] { display: none !important; }
.leader-body { flex: 1; overflow-y: auto; padding: 8px 12px 12px; }
.leader-row {
  display: flex; align-items: center; gap: 10px; padding: 9px 10px;
  border-bottom: 1px solid var(--border); font-size: 12.5px;
}
.leader-row .rank { width: 26px; color: var(--text-faint); font-family: var(--font-code); }
.leader-row.top .rank { color: #ffd166; font-weight: 700; }
.leader-row .lname { flex: 1; }
.leader-row .lmeta { color: var(--text-faint); font-size: 11px; }

/* =========================================================
   2026-10 收口：学生竖排菜单 / 发题器 / 顶栏 / 尺度自适应
   ========================================================= */

/* 仅供读屏与既有断言使用，视觉隐藏但可被 textContent 读取 */
.sr-only {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------- 顶栏：只留有用的信息 ---------- */
#topbar { gap: 8px; }
/* .tag 的 display 会覆盖 hidden 的 UA 样式，必须显式压回去 */
#topbar .tag[hidden] { display: none !important; }
#topbar .tag { max-width: 34vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#topbar .tag.room { background: color-mix(in srgb, var(--accent) 10%, transparent); border-color: color-mix(in srgb, var(--accent) 26%, var(--border)); color: var(--text-dim); }
#topbar .tag.conn { display: inline-flex; align-items: center; gap: 6px; }
#topbar .tag.conn::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--text-faint); box-shadow: none;
}
#topbar .tag.conn[data-state="open"]::before { background: var(--accent); box-shadow: 0 0 6px var(--accent); }
#topbar .tag.conn[data-state="closed"]::before { background: var(--danger); }
#topbar .tag.online { color: var(--text-mute); }
#topbar .user-chip { min-width: 0; }
#topbar .user-meta b { max-width: 12vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
@media (max-width: 900px) {
  #topbar .tag.online, #topbar .tag.ghost:not(.conn) { display: none; }
  #topbar .user-meta i { display: none; }
}

/* ---------- 右侧竖排菜单：教师/学生共用一套尺寸 ---------- */
#tools, #studTools {
  max-height: calc(100vh - 84px);
  overflow-y: auto; overflow-x: hidden;
  scrollbar-width: none; overscroll-behavior: contain;
}
#tools::-webkit-scrollbar, #studTools::-webkit-scrollbar { display: none; }
#studTools {
  position: fixed; right: 12px; top: 50%; transform: translateY(-50%);
  width: 48px; padding: 8px 6px;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  background: color-mix(in srgb, var(--chrome) 86%, transparent);
  border: 1px solid var(--border-2); border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,.45), 0 1px 0 rgba(255,255,255,.05) inset;
  backdrop-filter: blur(10px); z-index: 510;
}
#studTools[hidden] { display: none; }
#studTools .tbtn { width: 34px; height: 34px; }
#studTools .tsep { width: 22px; height: 1px; background: var(--border-2); margin: 3px 0; }
#studTools .mic.granted { color: var(--accent); background: color-mix(in srgb, var(--accent) 16%, transparent); }
#studTools .mic.muted { color: #ffb4a2; }
.rail-badge {
  position: absolute; top: 3px; right: 3px; min-width: 12px; height: 12px;
  border-radius: 7px; background: var(--accent); color: #06231a;
  font-size: 8.5px; font-weight: 700; line-height: 12px; padding: 0 3px;
}
#studTools .tbtn { position: relative; }
#hand.on, #problem-open.has-problem { color: var(--accent); }
#hand.on { background: color-mix(in srgb, var(--accent) 22%, transparent); border-color: color-mix(in srgb, var(--accent) 55%, transparent); }

/* 面板让开工具条，避免互相压住 */
#panel { right: 68px; top: 42px; width: min(322px, calc(100vw - 96px)); max-height: calc(100vh - 66px); overscroll-behavior: contain; }
#panel .me-bar.slim { padding: 2px 0 8px; line-height: 1.6; }

/* 多板翻页条已移入黑板内，跟随黑板上沿，不会盖住顶栏/警示条 */
#boardTabs { top: 6px; }
@media (max-height: 560px) {
  #boardTabs { top: 4px; }
}

/* 所有浮窗都不许超出视口 */
.win { max-width: calc(100vw - 20px); max-height: calc(100vh - 76px); }
.win-body, .ide-sheet-body { overscroll-behavior: contain; }

/* 窄屏：编译器贴右侧、宽度自适应，给竖排菜单让位 */
@media (max-width: 980px) {
  .ide-sheet {
    right: 70px; left: auto; top: 40px;
    width: calc(100vw - 150px); height: calc(100vh - 96px);
    max-width: calc(100vw - 150px); max-height: calc(100vh - 96px);
  }
  .ide-sheet.win-focus { left: 8px; right: 8px; width: auto; }
}

/* ---------- 发题器 ---------- */
.assign-win { width: 360px; height: 430px; left: 80px; top: 80px; z-index: 788; }
.assign-win[hidden] { display: none !important; }
.assign-body { flex: 1; min-height: 0; overflow-y: auto; padding: 10px 12px 12px; display: flex; flex-direction: column; gap: 8px; }
.assign-drop {
  border: 1px dashed var(--border-2); border-radius: var(--r-md);
  padding: 12px; text-align: center; display: flex; flex-direction: column; gap: 6px; align-items: center;
  background: color-mix(in srgb, var(--chrome-deep) 70%, transparent);
}
.assign-drop.drop { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.assign-drop .muted { font-size: 11px; line-height: 1.5; margin: 0; }
.assign-preview { border: 1px solid var(--border); border-radius: var(--r-md); overflow: hidden; height: 150px; flex: 0 0 auto; display: flex; align-items: center; justify-content: center; background: var(--chrome-deep); }
.assign-preview img { max-width: 100%; max-height: 100%; object-fit: contain; }
.assign-preview iframe { width: 100%; height: 100%; border: 0; background: #fff; }
.assign-actions { display: flex; align-items: center; gap: 6px; }
.assign-actions .muted { font-size: 11px; margin-left: auto; text-align: right; }
.assign-docs-head { font-size: 11px; color: var(--text-faint); letter-spacing: .4px; margin-top: 2px; }
.assign-docs { display: flex; flex-direction: column; gap: 4px; max-height: 120px; overflow-y: auto; }
.assign-doc {
  display: flex; align-items: center; gap: 8px; text-align: left; padding: 6px 8px;
  border-radius: 7px; background: var(--chrome-2); border: 1px solid var(--border); color: var(--text-dim); font-size: 12px;
}
.assign-doc:hover { color: var(--text); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.assign-doc .ad-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.assign-doc .ad-kind { font-size: 10px; color: var(--text-faint); }

/* ---------- 题目浮窗 ---------- */
.problem-win { width: 520px; height: 560px; left: 90px; top: 70px; z-index: 786; }
.problem-win[hidden] { display: none !important; }
.problem-body { flex: 1; min-height: 0; background: #0b0f12; display: flex; align-items: center; justify-content: center; overflow: auto; }
.problem-body img { max-width: 100%; max-height: 100%; object-fit: contain; }
.problem-body iframe { width: 100%; height: 100%; border: 0; background: #fff; }

/* ---------- 题面 Markdown（洛谷 B 题库风格） ---------- */
.problem-md {
  flex: 1 1 auto; align-self: stretch; min-width: 0;
  overflow: auto; background: #141414; color: #dcdcdc;
}
.assign-preview.md { height: 230px; display: block; overflow: auto; padding: 0; align-items: stretch; }
.md-problem { max-width: 880px; margin: 0 auto; padding: 18px 22px 34px; font: 14px/1.85 var(--font-ui, system-ui), "Microsoft YaHei", sans-serif; }
.assign-preview .md-problem { padding: 12px 14px 18px; font-size: 12px; }
.md-problem-head { padding-bottom: 12px; border-bottom: 1px solid #2c2c2c; margin-bottom: 4px; }
.md-crumb { display: flex; align-items: center; flex-wrap: wrap; gap: 7px; margin-bottom: 10px; }
.md-pid { font-family: var(--font-mono, ui-monospace, monospace); font-size: 12px; color: #8b8b8b; letter-spacing: .4px; }
.md-chip {
  font-size: 11px; line-height: 18px; padding: 0 8px; border-radius: 4px;
  color: #e3b566; border: 1px solid #5a4620; background: #241d10;
}
.md-chip.ghost { color: #9a9a9a; border-color: #3a3a3a; background: transparent; }
.md-problem h1 { margin: 2px 0 8px; font-size: 25px; line-height: 1.35; font-weight: 600; color: #f2f2f2; letter-spacing: .5px; }
.assign-preview .md-problem h1 { font-size: 18px; }
.md-facts { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; font-size: 12px; color: #8f8f8f; }
.md-facts b { color: #cfcfcf; font-weight: 500; }
.md-facts i { font-style: normal; opacity: .45; margin: 0 2px; }
.md-facts a { color: #e3b566; text-decoration: none; }
.md-facts a:hover { text-decoration: underline; }
.md-sec { margin-top: 22px; }
.md-sec h2 {
  display: flex; align-items: baseline; gap: 8px; margin: 0 0 8px;
  font-size: 15px; font-weight: 600; color: #f0f0f0; letter-spacing: .3px;
}
.md-sec h2 i { display: inline-block; width: 3px; height: 14px; border-radius: 2px; background: #d9a441; transform: translateY(1px); }
.md-sec h2 em { font-style: normal; font-size: 10px; letter-spacing: 1.4px; color: #6f6f6f; font-weight: 400; }
.md-sec-body { color: #d6d6d6; }
.md-sec-body p { margin: 7px 0; }
.md-sec-body strong { color: #f2f2f2; font-weight: 600; }
.md-sec-body code {
  font-family: var(--font-mono, ui-monospace, Consolas, monospace); font-size: .92em;
  padding: 1px 5px; border-radius: 4px; background: #262626; border: 1px solid #333; color: #e8c98a;
}
.md-sec-body a { color: #6cb6ff; text-decoration: none; }
.md-math { font-style: italic; color: #e8d3a0; padding: 0 1px; }
.md-ul { margin: 6px 0; padding-left: 20px; }
.md-ul li { margin: 3px 0; }
.md-pre {
  margin: 6px 0; padding: 10px 12px; border-radius: 7px; overflow: auto;
  background: #0f0f0f; border: 1px solid #2e2e2e;
  font: 12.5px/1.65 var(--font-mono, ui-monospace, Consolas, monospace); color: #d9d9d9;
}
.md-samples { display: flex; flex-direction: column; gap: 8px; }
.md-sample-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.md-sample { border: 1px solid #2e2e2e; border-radius: 8px; overflow: hidden; background: #101010; min-width: 0; }
.md-sample-head {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 5px 10px; font-size: 11px; color: #8a8a8a;
  background: #191919; border-bottom: 1px solid #2a2a2a;
}
.md-sample .md-pre { margin: 0; border: 0; border-radius: 0; background: #0d0d0d; min-height: 40px; }
.md-copy {
  padding: 1px 8px; font-size: 10.5px; line-height: 17px; border-radius: 4px;
  background: transparent; border: 1px solid #3a3a3a; color: #9a9a9a; cursor: pointer;
}
.md-copy:hover { color: #e3b566; border-color: #5a4620; }
@media (max-width: 640px) {
  .md-sample-row { grid-template-columns: 1fr; }
  .md-problem { padding: 14px 14px 26px; }
  .md-problem h1 { font-size: 21px; }
}

/* =========================================================
   方案 A：macOS Sequoia 毛玻璃窗口（2026-10-22 选定）
   ========================================================= */
.win, .ide-sheet {
  background: color-mix(in srgb, var(--chrome-3) 62%, transparent);
  -webkit-backdrop-filter: blur(34px) saturate(190%);
  backdrop-filter: blur(34px) saturate(190%);
  border: 1px solid rgba(255, 255, 255, .13);
  border-radius: 16px;
  box-shadow:
    0 32px 80px rgba(0, 0, 0, .55),
    0 2px 10px rgba(0, 0, 0, .35),
    inset 0 1px 0 rgba(255, 255, 255, .10);
}
.win .win-head {
  position: relative;
  height: 46px;
  background: linear-gradient(180deg, rgba(255, 255, 255, .075), rgba(255, 255, 255, .02));
  border-bottom: 1px solid rgba(255, 255, 255, .07);
  cursor: move;
}
.win .win-head .win-ico { display: none; }
.win .win-head .win-title {
  position: absolute; left: 50%; transform: translateX(-50%);
  max-width: 58%; text-align: center; margin: 0;
  font-size: 13px; font-weight: 500; color: rgba(255, 255, 255, .88); letter-spacing: .1px;
}
.win .win-head .ico {
  width: 26px; height: 26px; padding: 0; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .10);
  color: rgba(255, 255, 255, .62); font-size: 12px;
  opacity: 0; transition: opacity .15s ease, background .15s ease;
}
.win .win-head:hover .ico,
.win .win-head:focus-within .ico { opacity: .85; }
.win .win-head .ico:hover { opacity: 1; background: rgba(255, 255, 255, .13); color: #fff; }
.win .win-head .ico:focus-visible { opacity: 1; }

/* 红绿灯 */
.traffic { display: flex; align-items: center; gap: 8px; margin-right: 12px; flex: 0 0 auto; position: relative; z-index: 3; }
.traffic span {
  width: 12px; height: 12px; border-radius: 50%; cursor: pointer;
  box-shadow: inset 0 0 0 .5px rgba(0, 0, 0, .28);
  display: inline-flex; align-items: center; justify-content: center;
  font: 700 8px/1 -apple-system, "Segoe UI", sans-serif;
  color: rgba(0, 0, 0, 0); transition: filter .12s ease;
}
.traffic:hover span { color: rgba(0, 0, 0, .55); }
.traffic span:hover { filter: brightness(1.12); }
.traffic .t-red { background: #ff5f57; }
.traffic .t-yellow { background: #febc2e; }
.traffic .t-green { background: #28c840; }
.traffic .t-red::after { content: "×"; }
.traffic .t-yellow::after { content: "−"; }
.traffic .t-green::after { content: "+"; }

/* 工具栏/标题栏内的控件不要触发拖拽 */
.win .win-head button, .ide-sheet-head button { -webkit-app-region: no-drag; }

/* 最大化（绿色按钮 / 双击标题栏） */
.win.win-max, .ide-sheet.win-max {
  left: 8px !important; top: 38px !important;
  width: calc(100vw - 16px) !important; height: calc(100vh - 72px) !important;
  max-width: none !important; max-height: none !important;
  border-radius: 14px;
}

/* 编译器浮层沿用同一材质，但标题保持左对齐（避免压住快捷键提示） */
.ide-sheet {
  background: color-mix(in srgb, var(--chrome-3) 66%, transparent);
  border-radius: 16px;
}
.ide-sheet .ide-sheet-head {
  position: relative; height: 46px;
  background: linear-gradient(180deg, rgba(255, 255, 255, .075), rgba(255, 255, 255, .02));
  border-bottom: 1px solid rgba(255, 255, 255, .07);
}
.ide-sheet .ide-sheet-head .ico {
  border-radius: 50%; opacity: .55;
}
.ide-sheet .ide-sheet-head .ico:hover { opacity: 1; }

/* 降级：系统要求减少透明度 / 低性能设备 */
@media (prefers-reduced-transparency: reduce) {
  .win, .ide-sheet {
    background: var(--chrome-3);
    -webkit-backdrop-filter: none; backdrop-filter: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  .traffic span, .win .win-head .ico { transition: none; }
}





/* ---------- 学生入口（顶栏按钮 + 弹层） ---------- */
.join-entry { display: inline-flex; align-items: center; justify-content: center; }
.join-entry svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.join-pop {
  position: fixed; top: 44px; right: 14px; z-index: 920;
  width: min(320px, calc(100vw - 28px));
  display: flex; flex-direction: column; gap: 8px;
  padding: 12px 14px 14px; border-radius: 14px;
  background: color-mix(in srgb, var(--chrome-3) 78%, transparent);
  -webkit-backdrop-filter: blur(26px) saturate(180%);
  backdrop-filter: blur(26px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, .12);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .5), inset 0 1px 0 rgba(255, 255, 255, .08);
}
.join-pop[hidden] { display: none !important; }
.jp-head { display: flex; align-items: baseline; gap: 8px; }
.jp-head b { font-size: 13px; font-weight: 600; }
.jp-head span { font-size: 11px; color: var(--text-faint); }
.jp-room { font-size: 12px; color: var(--text-dim); }
.jp-room b { font-size: 15px; color: var(--text); letter-spacing: .5px; }
.join-pop .join-url { font-size: 11px; line-height: 1.5; word-break: break-all; user-select: text; }

/* =========================================================
   课件查看器 v2：左侧页栏 + 主舞台 + 底部控制条
   ========================================================= */
#cwWin .cw-body {
  display: flex; align-items: stretch; justify-content: flex-start;
  padding: 0; overflow: hidden; background: #0a0c0f;
}
#cwWin .cw-stage {
  position: relative; flex: 1 1 auto; min-width: 0;
  display: flex; align-items: center; justify-content: center;
  overflow: auto; padding: 14px;
  background: radial-gradient(120% 90% at 50% 0%, rgba(255,255,255,.03), transparent 60%), #0a0c0f;
}
#cwWin .page-wrap {
  margin: 0; flex: 0 0 auto; overflow: hidden; border-radius: 4px; background: #fff;
  box-shadow: 0 18px 50px rgba(0, 0, 0, .55), 0 1px 0 rgba(255,255,255,.06);
}
#cwWin .page-wrap canvas { display: block; max-width: 100%; }

#cwWin .cw-thumbs {
  position: static; width: 198px; flex: 0 0 198px; z-index: auto;
  border-right: 1px solid rgba(255, 255, 255, .08);
  background: rgba(14, 16, 19, .72);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  backdrop-filter: blur(20px) saturate(150%);
}
#cwWin .cw-thumbs[hidden] { display: none !important; }
#cwWin .cw-thumbs-head {
  height: 34px; padding: 0 8px 0 10px; gap: 6px;
  border-bottom: 1px solid rgba(255, 255, 255, .06);
}
#cwWin .cw-thumbs-head b { font-size: 11px; font-weight: 600; letter-spacing: .4px; color: var(--text-dim); }
#cwWin .cw-thumbs-head .ico { width: 22px; height: 22px; border-radius: 6px; }
#cwWin .cw-thumb-grid {
  display: flex; flex-direction: column; gap: 4px; padding: 8px;
  align-content: stretch; overflow: auto;
}
#cwWin .cw-thumb {
  display: flex; align-items: center; gap: 8px; padding: 4px 6px;
  border-radius: 7px; border: 1px solid transparent; background: transparent; text-align: left;
}
#cwWin .cw-thumb .n {
  position: static; order: 0; width: 18px; flex: 0 0 18px;
  text-align: right; font-size: 11px; color: var(--text-faint); text-shadow: none;
}
#cwWin .cw-thumb canvas {
  order: 1; width: 132px; max-width: calc(100% - 26px);
  border-radius: 3px; border: 1px solid rgba(255, 255, 255, .08);
}
#cwWin .cw-thumb.on { border-color: rgba(217, 164, 65, .65); background: rgba(217, 164, 65, .08); box-shadow: none; }
#cwWin .cw-thumb.on .n { color: #e3b566; }
#cwWin .cw-thumb:hover { background: rgba(255, 255, 255, .05); border-color: rgba(255, 255, 255, .12); }

#cwWin .cw-foot {
  position: relative; height: 46px; padding: 0 10px; gap: 8px;
  display: flex; align-items: center;
  background: rgba(17, 19, 23, .78);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  backdrop-filter: blur(20px) saturate(160%);
  border-top: 1px solid rgba(255, 255, 255, .07);
}
#cwWin .cw-foot .cw-group { display: flex; align-items: center; gap: 4px; }
#cwWin .cw-foot .cw-transport { position: absolute; left: 50%; transform: translateX(-50%); gap: 2px; }
#cwWin .cw-foot .cw-tail { margin-left: auto; gap: 8px; }
#cwWin .cw-foot .ico {
  width: 28px; height: 26px; border-radius: 7px; border: 0; background: transparent;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--text-dim); font-size: 13px;
}
#cwWin .cw-foot .ico:hover { background: rgba(255, 255, 255, .08); color: #fff; }
#cwWin .cw-foot .ico.play { width: 34px; color: #e3b566; }
#cwWin .cw-foot .ico.play.on { background: rgba(217, 164, 65, .16); color: #f0c67a; }
#cwWin .cw-foot .pager-input { width: 46px; height: 24px; }
#cwWin .cw-foot .pager { min-width: 52px; text-align: right; font: 12px var(--font-mono); color: var(--text-dim); }
#cwWin .cw-sync { font-size: 11px; color: var(--text-dim); display: inline-flex; align-items: center; gap: 5px; white-space: nowrap; }
#cwWin .cw-sync input { accent-color: #d9a441; }

@media (max-width: 900px) {
  #cwWin .cw-thumbs { width: 150px; flex-basis: 150px; }
  #cwWin .cw-thumb canvas { width: 96px; }
  #cwWin .cw-foot .cw-transport { position: static; transform: none; margin: 0 auto; }
  #cwWin .cw-sync { display: none; }
}

/* 底栏三列布局：避免绝对定位在窄窗口下与左右按钮重叠 */
#cwWin .cw-foot {
  display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center; column-gap: 8px;
}
#cwWin .cw-foot .cw-group { justify-self: start; }
#cwWin .cw-foot .cw-transport { position: static; transform: none; justify-self: center; }
#cwWin .cw-foot .cw-tail { justify-self: end; margin-left: 0; }

/* ---------- 讲解投屏（巡看 → 全班） ---------- */
.showcase-win { width: 820px; height: 580px; left: 110px; top: 72px; z-index: 812; }
.showcase-win[hidden] { display: none !important; }
.showcase-body { flex: 1; min-height: 0; display: flex; flex-direction: column; padding: 0; background: #0b0d10; }
#showcaseEditor { flex: 1 1 auto; min-height: 0; width: 100%; overflow: hidden; }
.showcase-bar {
  flex: 0 0 40px; display: flex; align-items: center; gap: 8px; padding: 0 10px;
  border-top: 1px solid rgba(255, 255, 255, .07);
  background: rgba(17, 19, 23, .72);
  -webkit-backdrop-filter: blur(18px); backdrop-filter: blur(18px);
}
.showcase-bar .primary { height: 26px; padding: 0 12px; font-size: 11.5px; border-radius: 7px; }
.showcase-bar .muted { font-size: 11px; }


/* ---------- 巡看：编译错因看板 ---------- */
.pdiags { flex: 1 1 auto; min-height: 0; overflow: auto; display: flex; flex-direction: column; gap: 8px; }
.pdiags[hidden] { display: none !important; }
.pdiag-head { display: flex; align-items: center; gap: 8px; font-size: 12px; }
.pdiag-head b { font-size: 12.5px; }
.pdiag-list { display: flex; flex-direction: column; gap: 8px; }
.pdiag-card { border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; background: rgba(255, 255, 255, .02); }
.pdiag-top { display: flex; justify-content: space-between; gap: 10px; font-size: 12.5px; }
.pdiag-top span { color: var(--text-faint); font-size: 11px; white-space: nowrap; }
.pdiag-hint { margin: 6px 0 4px; font-size: 12px; line-height: 1.6; color: var(--text-dim); }
.pdiag-names { font-size: 11px; color: var(--text-faint); }
.diag-badge { display: inline-block; min-width: 16px; padding: 0 5px; margin-left: 4px; border-radius: 8px; background: #d9a441; color: #1b1408; font-size: 10px; line-height: 16px; text-align: center; }
.pgrid[hidden] { display: none !important; }

/* 错因卡片：展开后的学生明细 / 档案 / AI */
.pdiag-top { cursor: pointer; }
.pdiag-card.open { border-color: rgba(217, 164, 65, .45); }
.pdiag-body { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; border-top: 1px solid var(--border); padding-top: 8px; }
.pdiag-stu { border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; background: rgba(0, 0, 0, .18); }
.pdiag-stu-head { display: flex; align-items: center; gap: 8px; font-size: 12px; }
.pdiag-stu-head span { color: var(--text-faint); font-size: 11px; }
.pdiag-errs { margin: 6px 0 0; padding-left: 0; list-style: none; display: flex; flex-direction: column; gap: 4px; }
.pdiag-errs li { font: 11px/1.5 var(--font-mono); color: var(--text-dim); word-break: break-word; }
.pdiag-errs li i { font-style: normal; color: #d9a441; margin-right: 6px; }
.pdiag-profile { margin-top: 6px; font-size: 11px; color: var(--text-dim); }
.pdiag-ai { margin-top: 6px; border-top: 1px dashed var(--border); padding-top: 6px; }
.pdiag-ai pre { margin: 0; white-space: pre-wrap; word-break: break-word; font: 11.5px/1.6 var(--font-mono); color: var(--text); max-height: 220px; overflow: auto; }
.pdiag-ai .err { color: #e38a8a; font-size: 11px; }

/* ---------- 成长档案（教师端） ---------- */
.profile-win { width: 680px; height: 700px; left: 170px; top: 60px; z-index: 814; }
.profile-win[hidden] { display: none !important; }
.profile-body {
  flex: 1 1 auto; min-height: 0; overflow: auto; display: flex; flex-direction: column; justify-content: flex-start; align-items: stretch; gap: 14px;
  padding: 16px 18px 20px; background: #0b0d10;
}
.pf-top { display: flex; flex-direction: column; gap: 4px; }
.pf-name { font-size: 18px; font-weight: 600; letter-spacing: .3px; }
.pf-meta { font-size: 11.5px; color: var(--text-faint); }
.pf-note { font-size: 11.5px; color: #d9a441; background: rgba(217, 164, 65, .08); border: 1px solid rgba(217, 164, 65, .25); border-radius: 8px; padding: 7px 10px; }
.pf-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.pf-stat { border: 1px solid var(--border); border-radius: 10px; padding: 8px 10px; background: rgba(255, 255, 255, .02); display: flex; flex-direction: column; gap: 4px; }
.pf-stat span { font-size: 11px; color: var(--text-faint); }
.pf-stat b { font-size: 18px; font-weight: 600; font-family: var(--font-mono); }
.pf-stat b i { font-style: normal; font-size: 10px; color: var(--text-faint); margin-left: 2px; }
.pf-section { display: flex; flex-direction: column; gap: 8px; }
.pf-section h4 { margin: 0; font-size: 12px; color: var(--text-dim); font-weight: 600; letter-spacing: .4px; }
.pf-bar { display: grid; grid-template-columns: 88px 1fr 92px; align-items: center; gap: 10px; font-size: 11.5px; }
.pf-bar-name { color: var(--text); }
.pf-bar-track { height: 8px; border-radius: 4px; background: rgba(255, 255, 255, .13); overflow: hidden; }
.pf-bar-track i { display: block; height: 100%; border-radius: 4px; background: linear-gradient(90deg, #b8862f, #e3b566); }
.pf-bar-num { text-align: right; color: var(--text-faint); font-family: var(--font-mono); font-size: 10.5px; }
.pf-events { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.pf-events li { display: grid; grid-template-columns: 92px 1fr; gap: 10px; font-size: 11.5px; padding: 5px 0; border-bottom: 1px dashed rgba(255, 255, 255, .06); }
.pf-events time { color: var(--text-faint); font-family: var(--font-mono); font-size: 10.5px; }
.pf-tips { margin: 0; padding-left: 18px; display: flex; flex-direction: column; gap: 5px; font-size: 11.5px; color: var(--text-dim); }
@media (max-width: 900px) { .pf-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }



/* ---------- 班级学情画像（V1） ---------- */
.class-win { width: 820px; height: 620px; left: 130px; top: 64px; z-index: 816; }
.class-win[hidden] { display: none !important; }
.class-body { flex: 1 1 auto; min-height: 0; overflow: auto; display: flex; flex-direction: column; align-items: stretch; justify-content: flex-start; gap: 14px;
  padding: 16px 18px 18px; background: #0b0d10; }
.cf-top { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
.cf-top > div { border: 1px solid var(--border); border-radius: 10px; padding: 8px 10px; background: rgba(255,255,255,.02); }
.cf-top b { display: block; font: 18px/1.3 var(--font-mono); font-weight: 600; }
.cf-top span { font-size: 10.5px; color: var(--text-faint); }
.cf-section { display: flex; flex-direction: column; gap: 7px; }
.cf-section h4 { margin: 0; font-size: 12px; color: var(--text-dim); font-weight: 600; letter-spacing: .4px; }
.cf-bar { display: grid; grid-template-columns: 150px 1fr 64px; gap: 9px; align-items: center; font-size: 11.5px; }
.cf-bar i { display: block; height: 8px; border-radius: 4px; background: rgba(255,255,255,.11); overflow: hidden; }
.cf-bar i em { display: block; height: 100%; border-radius: 4px; background: linear-gradient(90deg,#b8862f,#e3b566); }
.cf-bar b { text-align: right; font: 10.5px var(--font-mono); color: var(--text-faint); font-weight: 400; }
.cf-cats { display: flex; flex-wrap: wrap; gap: 6px; }
.cf-cat { font-size: 11px; color: var(--text-dim); border: 1px solid var(--border); border-radius: 20px; padding: 3px 9px; }
.cf-attn { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 5px; }
.cf-attn li { display: flex; gap: 8px; font-size: 11.5px; padding: 4px 0; border-bottom: 1px dashed rgba(255,255,255,.06); }
.cf-attn b { min-width: 64px; font-weight: 500; }
.cf-attn span { color: var(--text-dim); }
.cf-tip { font-size: 11.5px; color: #cbb27c; background: rgba(217,164,65,.07); border: 1px solid rgba(217,164,65,.22); border-radius: 9px; padding: 9px 11px; line-height: 1.65; }
.cf-tip b { color: #f0c67a; font-weight: 600; }
.cf-foot { display: flex; gap: 8px; margin-top: auto; }



/* V2 个人画像：过程信号 / 教学处方 */
.pf-signals { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.pf-signals > div { border: 1px solid var(--border); border-radius: 9px; padding: 7px 9px; background: rgba(255,255,255,.02); }
.pf-signals b { display: block; font: 16px/1.3 var(--font-mono); font-weight: 600; }
.pf-signals span { font-size: 10.5px; color: var(--text-faint); }
.pf-rx { display: flex; flex-direction: column; gap: 8px; }
.pf-rx-card { border: 1px solid var(--border); border-radius: 9px; padding: 9px 11px; background: rgba(217,164,65,.05); }
.pf-rx-card b { display: block; font-size: 12px; margin-bottom: 4px; color: #e6c47f; }
.pf-rx-card p { margin: 0; font-size: 11.5px; color: var(--text-dim); line-height: 1.6; }

/* 班级画像：错因 × GESP 级别热力图 */
.cf-heat { display: grid; grid-template-columns: 110px repeat(8, 1fr); gap: 3px; align-items: center; }
.cf-heat .cf-h { font: 9.5px var(--font-mono); color: var(--text-faint); text-align: center; }
.cf-heat .cf-rh { font-size: 11px; color: var(--text-dim); padding-right: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cf-heat .cf-cell { height: 24px; border-radius: 5px; display: flex; align-items: center; justify-content: center;
  font: 10px var(--font-mono); color: var(--text-faint); background: rgba(255,255,255,.025); }
.cf-heat .cf-cell.c1 { background: rgba(217,164,65,.13); color: #d9b26a; }
.cf-heat .cf-cell.c2 { background: rgba(217,164,65,.28); color: #f0c67a; }
.cf-heat .cf-cell.c3 { background: rgba(224,96,96,.30); color: #ffb3b3; }


/* V2 检查表 / 推断 / 处方证据；班级洞察卡 */
.pf-check { display: flex; flex-direction: column; gap: 6px; }
.pf-check-row { display: grid; grid-template-columns: 10px 120px 1fr; gap: 8px; align-items: center; font-size: 11.5px; }
.pf-check-row b { font-weight: 500; color: var(--text-dim); }
.pf-check-row .dot { width: 7px; height: 7px; border-radius: 50%; background: #39414c; display: inline-block; }
.pf-check-row .dot.red { background: var(--red); } .pf-check-row .dot.gold { background: var(--gold); }
.pf-check-chips { display: flex; flex-wrap: wrap; gap: 4px; }
.pf-infer { display: flex; flex-direction: column; gap: 7px; }
.pf-infer-card { border: 1px solid rgba(217,164,65,.22); background: rgba(217,164,65,.05); border-radius: 9px; padding: 8px 10px; }
.pf-infer-card b { display: block; font-size: 12px; color: #e6c47f; margin-bottom: 3px; }
.pf-infer-card p { margin: 0 0 3px; font-size: 11.5px; color: var(--text-dim); line-height: 1.55; }
.pf-infer-card span { font-size: 10.5px; color: var(--text-faint); }
.pf-rx-ev { display: block; margin-top: 4px; font-size: 10.5px; color: var(--text-faint); }
.cf-insights { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.cf-insight { border: 1px solid var(--border); border-radius: 10px; padding: 9px 10px; background: rgba(255,255,255,.02); }
.cf-insight b { display: block; font-size: 11.5px; margin-bottom: 4px; color: #d9b26a; }
.cf-insight p { margin: 0; font-size: 10.8px; line-height: 1.55; color: var(--text-dim); }