:root{--bg:#fafaf9;--fg:#1c1917;--muted:#78716c;--muted-2:#a8a29e;--muted-bg:#f5f5f4;--muted-bg-2:#efeeec;--border:#e7e5e4;--border-strong:#d6d3d1;--primary:#1d6fe0;--primary-hover:#1559c2;--primary-soft:#e3eeff;--primary-soft-hover:#d4e6ff;--primary-fg:#fff;--warn-bg:#fef3c7;--warn-fg:#78350f;--warn-bd:#f59e0b;--warn-bd-soft:#fcd34d;--err-bg:#fee2e2;--err-fg:#7f1d1d;--err-bd:#dc2626;--info-bg:#ecfeff;--info-bd:#67e8f9;--font-sans:"Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, system-ui, sans-serif;--font-serif:"Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;--font-mono:"JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;--r-card:12px;--r-chip:6px;--r-btn:8px;--shadow-drawer:-8px 0 24px #1c19170f;--shadow-card:0 1px 0 #1c191705}*{box-sizing:border-box}:root{--font-scale:1.15;--fs:var(--font-scale)}html[data-font-scale=sm]{--font-scale:1;--fs:1}html[data-font-scale=md]{--font-scale:1.15;--fs:1.15}html[data-font-scale=lg]{--font-scale:1.3;--fs:1.3}html,body{background:var(--bg);color:var(--fg);font-family:var(--font-sans);font-size:calc(15px * var(--font-scale));-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-feature-settings:"palt";margin:0;padding:0;line-height:1.6}button{font-family:inherit;font-size:inherit;color:inherit;cursor:pointer;background:0 0;border:none;padding:0}input,textarea{font-family:inherit;font-size:inherit;color:inherit;background:0 0;border:none;outline:none;padding:0}a{color:inherit;text-decoration:none}::selection{background:var(--primary-soft);color:var(--fg)}.proto-nav{z-index:100;color:#fafaf9;font-size:calc(12px * var(--font-scale));font-family:var(--font-mono);background:#1c1917;border-bottom:1px solid #292524;align-items:center;gap:12px;padding:8px 16px;display:flex;position:sticky;top:0}.proto-nav__label{color:#a8a29e;letter-spacing:.06em;text-transform:uppercase;font-size:calc(10px * var(--font-scale));border-right:1px solid #44403c;padding-right:8px}.proto-nav__tabs{flex-wrap:wrap;flex:1;gap:4px;display:flex}.proto-nav__tab{color:#d6d3d1;white-space:nowrap;border:1px solid #0000;border-radius:4px;padding:5px 10px;transition:background .12s,color .12s}.proto-nav__tab:hover{color:#fafaf9;background:#292524}.proto-nav__tab--active,.proto-nav__tab--active:hover{color:#1c1917;background:#fafaf9}.proto-nav__meta{color:#78716c;font-size:calc(10px * var(--font-scale));letter-spacing:.04em}.app-shell{background:var(--bg);flex-direction:column;height:100vh;display:flex}.topbar{border-bottom:1px solid var(--border);background:#fff;flex-shrink:0;align-items:center;gap:16px;height:56px;padding:0 20px;display:flex}.topbar__menu{width:34px;height:34px;color:var(--fg);border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;display:none}.topbar__menu:hover{background:var(--muted-bg)}.sidebar__scrim{display:none}.topbar__brand{cursor:pointer;align-items:baseline;gap:10px;display:flex}.topbar__brand-mark{font-weight:700;font-size:calc(16px * var(--font-scale));letter-spacing:.01em;color:var(--fg)}.topbar__brand-mark .dot{background:var(--primary);vertical-align:middle;border-radius:50%;width:6px;height:6px;margin-right:8px;display:inline-block;transform:translateY(-1px)}.topbar__brand-course{font-size:calc(13px * var(--font-scale));color:var(--muted)}.topbar__week{font-size:calc(13px * var(--font-scale));color:var(--fg);border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:6px;align-items:center;gap:6px;padding:5px 10px;display:inline-flex}.topbar__week:hover{border-color:var(--border-strong)}.topbar__week svg{color:var(--muted)}.topbar__mode{font-size:calc(13px * var(--font-scale));background:var(--muted-bg);color:var(--fg);cursor:pointer;border-radius:6px;align-items:center;gap:6px;padding:5px 10px;display:inline-flex}.topbar__mode:hover{background:var(--border)}.topbar__mode svg{color:var(--muted)}.topbar__mode-wrap{position:relative}.topbar__mode-menu{border:1px solid var(--border);z-index:50;background:#fff;border-radius:10px;width:300px;padding:6px;position:absolute;top:calc(100% + 8px);left:0;box-shadow:0 12px 32px #0000001f}.topbar__mode-menu-head{font-size:calc(11px * var(--font-scale));color:var(--muted);padding:6px 8px 8px}.topbar__mode-item{text-align:left;width:100%;font:inherit;cursor:pointer;background:0 0;border:0;border-radius:8px;align-items:center;gap:10px;padding:8px;display:flex}.topbar__mode-item:not(.topbar__mode-item--soon):hover,.topbar__mode-item--current{background:var(--muted-bg)}.topbar__mode-item--soon{opacity:.5;cursor:default}.topbar__mode-item__icon{font-size:calc(16px * var(--font-scale));line-height:1}.topbar__mode-item__text{flex-direction:column;flex:1;gap:2px;display:flex}.topbar__mode-item__name{font-size:calc(13px * var(--font-scale));color:var(--fg);font-weight:500}.topbar__mode-item__desc{font-size:calc(11px * var(--font-scale));color:var(--muted)}.topbar__mode-tag{font-size:calc(10px * var(--font-scale));color:var(--muted);border:1px solid var(--border);white-space:nowrap;border-radius:4px;padding:2px 6px}.topbar__mode-item--current .topbar__mode-tag{color:var(--primary);border-color:var(--primary)}.topbar__brand-gap{flex-shrink:0;width:24px}.topbar__spacer{flex:1;min-width:0}.topbar__user{font-size:calc(13px * 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