:root{color-scheme:dark;--ink-0: #05080f;--ink-1: #0a1420;--ink-2: #101a2b;--ink-3: #15263e;--bone: #ece2cb;--bone-soft: #bcb299;--bone-dim: #8a836f;--ochre: #d4a257;--ochre-soft: #e8c286;--ember: #c8693d;--teal: #5e9ba0;--teal-soft: #8dc3c6;--plum: #8e73b7;--hairline: rgba(236, 226, 203, .1);--hairline-mid: rgba(236, 226, 203, .18);--hairline-strong: rgba(236, 226, 203, .28);--edge-top: inset 0 1px 0 rgba(236, 226, 203, .08);--edge-top-strong: inset 0 1px 0 rgba(236, 226, 203, .15);--edge-inset: inset 0 1px 2px rgba(0, 0, 0, .3);--shadow-1: 0 1px 2px rgba(0, 0, 0, .25), 0 2px 6px -2px rgba(0, 0, 0, .2);--shadow-2: 0 4px 10px -4px rgba(0, 0, 0, .5), 0 2px 4px -1px rgba(0, 0, 0, .25);--shadow-3: 0 12px 28px -10px rgba(0, 0, 0, .6), 0 4px 12px -3px rgba(0, 0, 0, .3);--shadow-4: 0 30px 70px -20px rgba(0, 0, 0, .75), 0 8px 24px -6px rgba(0, 0, 0, .4);--shadow-modal: 0 50px 100px -30px rgba(0, 0, 0, .95), 0 20px 40px -15px rgba(0, 0, 0, .6);--glow-ochre-soft: 0 0 0 1px rgba(212, 162, 87, .2), 0 8px 20px -8px rgba(212, 162, 87, .4);--glow-ochre: 0 0 0 1px rgba(212, 162, 87, .35), 0 10px 30px -10px rgba(212, 162, 87, .55);--glow-teal: 0 0 0 1px rgba(94, 155, 160, .25), 0 8px 20px -8px rgba(94, 155, 160, .4);--font-body: "Noto Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, sans-serif;--font-display: "Noto Serif SC", "Songti SC", "Source Han Serif SC", "STSong", Georgia, serif;--font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;--font-latin: "Manrope", var(--font-body);--fs-scale: 1;--fs-10: calc(10.5px * var(--fs-scale));--fs-11: calc(11.5px * var(--fs-scale));--fs-13: calc(13px * var(--fs-scale));--fs-14: calc(14.5px * var(--fs-scale));--fs-16: calc(16px * var(--fs-scale));--fs-20: calc(20px * var(--fs-scale));--fs-28: calc(28px * var(--fs-scale));--lh-body: 1.7;--lh-tight: 1.45;--ease-out-expo: cubic-bezier(.22, 1, .36, 1);--ease-soft: cubic-bezier(.4, 0, .2, 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minmax(0,1fr) var(--course-footer-height, 118px)}@media (min-width: 1280px) and (max-width: 1599px){.app-shell{padding:10px 14px;gap:8px}.main-grid{gap:10px}.main-grid{grid-template-columns:minmax(0,1fr) var(--chat-width, 400px)}}@media (min-width: 1600px) and (max-width: 2199px){.main-grid{grid-template-columns:minmax(0,1fr) var(--chat-width, 480px)}}@media (min-width: 2200px) and (max-width: 2799px){.app-shell{max-width:2000px;margin-left:auto;margin-right:auto;padding:18px 28px;gap:14px}.main-grid{grid-template-columns:minmax(0,1fr) var(--chat-width, 500px);gap:18px}}@media (min-width: 2800px){.app-shell{max-width:2100px;margin-left:auto;margin-right:auto;padding:22px 36px;gap:16px}.main-grid{grid-template-columns:minmax(0,1fr) var(--chat-width, 520px);gap:22px}}.chrome{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:18px;padding:0 6px;animation:fade-in .7s var(--ease-out-expo) 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rgba(212,162,87,.2);border-radius:10px}.chapter-summary-title{font-family:var(--font-display, "Noto Serif SC", serif);font-size:12.5px;font-weight:600;letter-spacing:.06em;color:var(--ochre, #d4a257);margin-bottom:8px;text-transform:none}.chapter-summary-list{margin:0;padding-left:18px;list-style:disc}.chapter-summary-list li{font-family:var(--font-body, sans-serif);font-size:13px;line-height:1.68;color:var(--bone-soft, #bcb299);padding:2px 0}.chapter-confirm-overlay{position:absolute;top:0;right:0;bottom:0;left:0;z-index:3400;display:flex;align-items:center;justify-content:center;background:#05080f99;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);pointer-events:auto}.chapter-confirm-box{background:#0a0e18f5;border:1px solid rgba(212,162,87,.35);border-radius:14px;padding:24px 28px 20px;box-shadow:0 24px 60px -12px #000000d9;display:flex;flex-direction:column;align-items:center;gap:18px;min-width:260px;max-width:320px}.chapter-confirm-msg{margin:0;font-family:var(--font-display, "Noto Serif SC", serif);font-size:15px;color:var(--bone, #ece2cb);text-align:center;line-height:1.65}.chapter-confirm-actions{display:flex;gap:10px;width:100%}.chapter-confirm-btn{flex:1;pointer-events:auto;padding:9px 0;border-radius:9px;border:1px solid rgba(212,162,87,.35);font-family:var(--font-body, sans-serif);font-size:14px;font-weight:600;cursor:pointer;transition:background .18s ease,transform .12s ease}.chapter-confirm-btn.stay{background:var(--ochre, #d4a257);color:var(--ink-0, #05080f);border-color:var(--ochre, #d4a257)}.chapter-confirm-btn.stay:hover{background:var(--ochre-soft, #e8c286)}.chapter-confirm-btn.leave{background:transparent;color:var(--bone-dim, rgba(188, 178, 153, .7));border-color:#bcb29940}.chapter-confirm-btn.leave:hover{background:#bcb29914;color:var(--bone-soft, #bcb299)}.chat-bypass-notice{position:absolute;left:50%;bottom:86px;transform:translate(-50%);z-index:40;max-width:min(420px,calc(100% - 32px));padding:9px 16px;border-radius:999px;border:1px solid rgba(212,162,87,.5);background:linear-gradient(180deg,#d4a25729,#d4a2570d),#0a1420eb;color:var(--ochre-soft, #e8c286);font-size:12.5px;line-height:1.5;text-align:center;box-shadow:var(--shadow-3, 0 12px 28px -10px rgba(0, 0, 0, .6));backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);animation:bypass-notice-in .22s var(--ease-soft, ease);pointer-events:none}@keyframes bypass-notice-in{0%{opacity:0;transform:translate(-50%,8px)}to{opacity:1;transform:translate(-50%)}}@media (prefers-reduced-motion: reduce){.chat-bypass-notice{animation:none}}