:root{--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "HarmonyOS Sans SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;--font-mono: ui-monospace, SFMono-Regular, "SF Mono", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;--s1: 4px;--s2: 8px;--s3: 12px;--s4: 16px;--s5: 20px;--s6: 24px;--s8: 32px;--s10: 40px;--s12: 48px;--r-sm: 8px;--r-md: 12px;--r-lg: 16px;--r-xl: 22px;--tap: 44px;--ease: cubic-bezier(.22, .61, .36, 1);--ease-out: cubic-bezier(.16, 1, .3, 1);--dur-1: .16s;--dur-2: .26s;--dur-3: .42s;--topbar-h: 62px;--safe-b: env(safe-area-inset-bottom, 0px);--safe-t: env(safe-area-inset-top, 0px)}:root,html[data-theme=dark]{color-scheme:dark;--bg: #060910;--bg-2: #0a1020;--bg-glow-1: rgba(34, 211, 238, .16);--bg-glow-2: rgba(129, 140, 248, .14);--panel: rgba(13, 20, 35, .74);--panel-solid: #0c1424;--panel-2: rgba(23, 33, 53, .72);--panel-hi: rgba(148, 163, 184, .06);--line: rgba(148, 163, 184, .16);--line-strong: rgba(148, 163, 184, .28);--fg: #e8eefb;--fg-1: #b8c5d9;--fg-2: #8494ad;--fg-3: #5d6b83;--accent: #22d3ee;--accent-soft: rgba(34, 211, 238, .14);--accent-ink: #03212a;--accent-2: #818cf8;--accent-2-soft: rgba(129, 140, 248, .14);--energy: #f5a623;--energy-soft: rgba(245, 166, 35, .14);--ok: #34d399;--ok-soft: rgba(52, 211, 153, .14);--bad: #f87171;--bad-soft: rgba(248, 113, 113, .14);--warn: #fbbf24;--warn-soft: rgba(251, 191, 36, .14);--shadow-1: 0 1px 2px rgba(0, 0, 0, .4);--shadow-2: 0 12px 32px -12px rgba(0, 0, 0, .7);--shadow-3: 0 32px 64px -24px rgba(0, 0, 0, .8);--glass-blur: 18px;--grid-line: rgba(148, 163, 184, .09);--stage-bg: radial-gradient(120% 100% at 50% 0%, #0d1424 0%, #070b16 55%, #04060d 100%);--scrim: rgba(3, 6, 12, .66)}html[data-theme=light]{color-scheme:light;--bg: #f3f6fb;--bg-2: #e9eef7;--bg-glow-1: rgba(14, 116, 144, .1);--bg-glow-2: rgba(67, 56, 202, .08);--panel: rgba(255, 255, 255, .9);--panel-solid: #ffffff;--panel-2: rgba(243, 246, 251, .9);--panel-hi: rgba(15, 23, 42, .03);--line: rgba(15, 23, 42, .1);--line-strong: rgba(15, 23, 42, .18);--fg: #0d1526;--fg-1: #33415c;--fg-2: #5a6779;--fg-3: #8a96a8;--accent: #0e7490;--accent-soft: rgba(14, 116, 144, .1);--accent-ink: #ffffff;--accent-2: #4338ca;--accent-2-soft: rgba(67, 56, 202, .1);--energy: #b45309;--energy-soft: rgba(180, 83, 9, .1);--ok: #059669;--ok-soft: rgba(5, 150, 105, .1);--bad: #dc2626;--bad-soft: rgba(220, 38, 38, .09);--warn: #b45309;--warn-soft: rgba(180, 83, 9, .1);--shadow-1: 0 1px 2px rgba(15, 23, 42, .06);--shadow-2: 0 10px 28px -14px rgba(15, 23, 42, .28);--shadow-3: 0 28px 56px -24px rgba(15, 23, 42, .3);--glass-blur: 14px;--grid-line: rgba(15, 23, 42, .07);--stage-bg: radial-gradient(120% 100% at 50% 0%, #ffffff 0%, #eef3fa 60%, #e6edf7 100%);--scrim: rgba(15, 23, 42, 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i{background:#0000002e;border-color:transparent;color:var(--accent-ink)}.top-actions{display:flex;align-items:center;gap:var(--s2);flex:none}.icon-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:var(--tap);height:38px;padding:0 10px;border-radius:var(--r-md);border:1px solid var(--line);background:var(--panel-2);color:var(--fg-1);font-size:12.5px;transition:all var(--dur-1) var(--ease)}.icon-btn svg{width:17px;height:17px}.icon-btn:hover{color:var(--fg);border-color:var(--line-strong);background:var(--panel)}.icon-btn:active{transform:scale(.96)}.icon-btn[aria-pressed=true]{color:var(--accent);border-color:var(--accent);background:var(--accent-soft)}.icon-btn.sm{min-width:34px;height:34px;padding:0}#btn-theme .ico-sun{display:none}#btn-theme .ico-moon,html[data-theme=light] #btn-theme .ico-sun{display:block}html[data-theme=light] #btn-theme .ico-moon{display:none}@media (max-width: 860px){.brand-txt i,#btn-teacher span{display:none}}@media 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