:root,:root[data-theme=dark]{--bg: #0d1117;--bg-hero: radial-gradient(1200px 400px at 80% -10%, #1b2330 0%, #0d1117 60%);--card: #161b22;--card-hover: #1c232d;--text: #e6edf3;--muted: #8b949e;--accent: #d62b2b;--accent-hover: #b62525;--success: #2ea043;--warning: #d29922;--info: #58a6ff;--border: #30363d;color-scheme:dark}:root[data-theme=light]{--bg: #f6f8fa;--bg-hero: radial-gradient(1200px 400px at 80% -10%, #fff 0%, #f6f8fa 60%);--card: #ffffff;--card-hover: #f0f3f6;--text: #1f2328;--muted: #57606a;--accent: #c92525;--accent-hover: #a91d1d;--success: #1a7f37;--warning: #9a6700;--info: #0969da;--border: #d0d7de;color-scheme:light}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}h1,h2,h3{font-weight:650}a{color:var(--info)}code{background:#7f7f7f26;padding:1px 6px;border-radius:5px;font-size:.88em}.topbar{border-bottom:1px solid var(--border);background:var(--card);position:sticky;top:0;z-index:20}.topbar-inner{max-width:1180px;margin:0 auto;padding:12px 22px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.brand{display:flex;align-items:center;gap:12px}.brand-mark{width:38px;height:38px;border-radius:10px;flex:0 0 auto;background:linear-gradient(135deg,var(--accent),#ff5a5a);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:18px;letter-spacing:-.5px;box-shadow:0 2px 10px #d62b2b59}.brand h1{margin:0;font-size:1.12rem;line-height:1.1}.brand .sub{margin:2px 0 0;color:var(--muted);font-size:.74rem;letter-spacing:.02em}.env-tag{font-weight:800;font-size:.82rem;letter-spacing:.06em;color:var(--accent);border:1.5px solid var(--accent);border-radius:6px;padding:1px 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var(--border);background:var(--card);color:var(--text);cursor:pointer;font-size:14px;font-weight:600}.tab:hover{background:var(--card-hover)}.tab.on{background:var(--accent);border-color:var(--accent);color:#fff}.container{max-width:1180px;margin:0 auto;padding:26px 22px 60px}.hero{background:var(--bg-hero)}.page-title{margin:0 0 4px;font-size:1.5rem}.page-sub{margin:0 0 22px;color:var(--muted)}.section-title{font-size:1.05rem;margin:0 0 12px}.muted{color:var(--muted)}.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:14px}.scenario{text-align:left;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:18px;cursor:pointer;transition:border-color .15s,transform .12s,background .15s,box-shadow .15s;color:var(--text);border-top:3px solid 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820px){.sv-wrap{grid-template-columns:1fr}}.chat-fab{position:fixed;bottom:22px;right:22px;z-index:1000;width:56px;height:56px;border-radius:50%;border:0;cursor:pointer;background:var(--accent);color:#fff;font-size:22px;box-shadow:0 6px 20px #d62b2b73;transition:transform .15s}.chat-fab:hover{transform:scale(1.07)}.chat-panel{position:fixed;bottom:88px;right:22px;z-index:1000;width:360px;max-width:calc(100vw - 32px);height:520px;max-height:calc(100vh - 130px);background:var(--card);border:1px solid var(--border);border-radius:16px;display:flex;flex-direction:column;overflow:hidden;box-shadow:0 12px 40px #00000059}.chat-head{padding:14px 16px;border-bottom:1px solid var(--border);display:flex;flex-direction:column;gap:2px}.chat-body{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:10px}.chat-msg{padding:9px 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solid;margin-bottom:10px}.howto-n{font-size:13px;color:var(--muted);font-weight:800}.howto-title{font-weight:800;font-size:1.12rem;margin:3px 0 7px}.howto-desc{font-size:13.5px;color:var(--muted);line-height:1.5}.howto-arrow{color:var(--accent);padding:0 6px;font-size:22px;flex:0 0 auto;opacity:0}.howto-flow.in .howto-arrow{animation:fadeArrow .45s ease forwards}@media (max-width: 720px){.howto-flow{flex-direction:column}.howto-step-wrap{flex-direction:column;width:100%}.howto-arrow{transform:rotate(90deg);padding:6px 0}.howto-flow.in .howto-arrow{animation:none;opacity:.55}}.uc-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}.uc-tab{padding:9px 16px;border-radius:999px;border:1px solid var(--border);background:var(--card);color:var(--text);cursor:pointer;font-weight:600;font-size:.9rem;transition:transform .12s,border-color .12s,background .12s}.uc-tab:hover{border-color:var(--accent);transform:translateY(-1px)}.uc-tab.on{background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:0 4px 14px #dc26264d}.uc-feature{max-width:560px;margin:0 auto;text-align:center;padding:30px 28px 34px;border:1px solid var(--border);border-radius:22px;background:var(--card);box-shadow:0 14px 40px #00000029;animation:fadeInUp .4s ease}.uc-photo{margin:0 auto 6px}.uc-name{font-size:1.7rem;font-weight:800;margin:14px 0 2px}.uc-scenario{color:var(--muted);font-weight:600;margin:0 0 16px}.uc-situation{font-size:1.02rem;line-height:1.6;margin:0 auto 24px;max-width:470px}.uc-start{font-size:1.15rem;padding:15px 42px;border-radius:999px;box-shadow:0 8px 22px #dc262652;transition:transform .12s}.uc-start:hover:not(:disabled){transform:translateY(-2px)}.uc-lang{font-size:12px;margin-top:16px}.tone-blue{color:#3b82f6;border-color:#3b82f666;background:#3b82f61a}.tone-slate{color:var(--muted);border-color:var(--border)}.tone-red{color:var(--accent);border-color:#dc262666;background:#dc26261a}.tone-amber{color:#d97706;border-color:#d9770666;background:#d977061f}.cost-table{width:100%;border-collapse:collapse;font-size:.85rem;margin-top:8px}.cost-table th{text-align:left;font-weight:600;color:var(--muted);border-bottom:1px solid var(--border);padding:4px 6px}.cost-table td{padding:5px 6px;border-bottom:1px solid var(--border)}.cost-table tr.cost-total td{border-top:2px solid var(--border);border-bottom:none}.chat-msg.assistant .chat-p{margin:0 0 7px}.chat-msg.assistant .chat-p:last-child{margin-bottom:0}.chat-msg.assistant .chat-ul{margin:4px 0 7px;padding-left:18px}.chat-msg.assistant .chat-ul li{margin:2px 0}.chat-msg.typing{display:flex;align-items:center;gap:9px}.typing-label{font-size:.8rem;color:var(--muted);font-style:italic}.typing-dots{display:inline-flex;gap:4px}.typing-dots span{width:7px;height:7px;border-radius:50%;background:var(--accent);opacity:.35;animation:typing-bounce 1.2s infinite ease-in-out}.typing-dots span:nth-child(2){animation-delay:.18s}.typing-dots span:nth-child(3){animation-delay:.36s}@keyframes typing-bounce{0%,80%,to{transform:translateY(0);opacity:.35}40%{transform:translateY(-5px);opacity:1}}.chat-quick{display:flex;flex-direction:column;gap:8px;margin-top:6px}.chat-chip{text-align:left;background:var(--bg);border:1px solid var(--border);color:var(--text);border-radius:10px;padding:9px 12px;cursor:pointer;font-size:.85rem}.chat-chip:hover{border-color:var(--accent)}.chat-input{display:flex;gap:8px;padding:12px;border-top:1px solid var(--border);align-items:flex-end}.chat-input input{flex:1}.ask-text{flex:1;min-height:64px;max-height:160px;resize:vertical;font-family:inherit;font-size:.92rem;line-height:1.4}.chat-head{cursor:move;-webkit-user-select:none;user-select:none}.chat-feedback{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column}.feedback-text{width:100%;min-height:160px;resize:vertical;font-size:.92rem;line-height:1.45}.credit{text-align:center;color:var(--muted);font-size:12px;padding:26px 16px 40px}.credit-row{display:flex;align-items:center;justify-content:center;gap:14px}.lobby{text-align:center;display:flex;flex-direction:column;align-items:center}.bot-avatar{width:184px;height:184px;border-radius:50%;display:grid;place-items:center;overflow:hidden;background:var(--card);border:3px solid var(--border);margin:0 auto 16px;transition:border-color .3s}.bot-avatar img{width:100%;height:100%;object-fit:cover;object-position:center 22%;border-radius:50%;display:block}.bot-avatar.waiting{border-color:var(--warning);animation:bob 2s ease-in-out infinite}.bot-avatar.joined{border-color:var(--success);box-shadow:0 0 0 6px #2ea04326}.bot-avatar.live{width:150px;height:150px;animation:pulsering 1.8s infinite}@keyframes bob{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}@keyframes pulsering{0%{box-shadow:0 0 #2ea04373}70%{box-shadow:0 0 0 14px #2ea04300}to{box-shadow:0 0 #2ea04300}}.join-alert{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:1.05rem;padding:10px 18px;border-radius:10px}.join-alert.joined{color:var(--success);background:#2ea0431f}.join-alert.waiting{color:var(--warning);background:#d299221f}.btn-lg{font-size:1.05rem;padding:12px 26px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:flex-start;justify-content:center;z-index:1500;padding:40px 16px;overflow-y:auto}.modal{position:relative;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:24px;width:min(960px,96vw);max-height:88vh;overflow-y:auto;box-shadow:0 20px 60px #0006}.modal-close{position:absolute;top:12px;right:12px;width:30px;height:30px;border-radius:8px;border:1px solid var(--border);background:var(--card);color:var(--text);cursor:pointer;font-size:14px}.modal-close:hover{background:var(--card-hover)}.spin{width:14px;height:14px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;display:inline-block;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.login-wrap{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;background:var(--bg-hero)}.login-card{width:360px;max-width:calc(100vw - 32px);background:var(--card);border:1px solid var(--border);border-radius:16px;padding:26px;display:flex;flex-direction:column;box-shadow:0 12px 40px #00000047}.login-card input{width:100%}.maint-banner{background:var(--warning);color:#1a1200;text-align:center;padding:9px 16px;font-weight:600;font-size:.9rem}.active-badge{display:inline-flex;align-items:center;gap:6px;font-size:.72rem;font-weight:700;color:var(--text);border:1px solid var(--border);border-radius:999px;padding:3px 10px}.active-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--muted)}.active-badge.live .dot{background:var(--success);box-shadow:0 0 #2ea04399;animation:pulse 1.6s infinite}.userchip{font-size:.78rem;color:var(--muted)}.userchip b{color:var(--text)}