:root{--bg-app:#f7f8fa;--bg-sidebar:#f0f2f5;--bg-main:#fff;--bg-hover:#0f172a0a;--bg-active:#3b6fff14;--bg-composer:#fff;--border-subtle:#0f172a0f;--border-strong:#0f172a1a;--text-primary:#1f2329;--text-secondary:#646a73;--text-tertiary:#8f959e;--accent:#3b6fff;--accent-soft:#e8efff;--accent-hover:#2f5ef0;--danger:#e5484d;--shadow-composer:0 8px 28px #1f232914, 0 1px 2px #1f23290a;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:20px;--sidebar-width:260px;--header-height:56px;--font-sans:"DM Sans", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;--content-max:760px;--ease:cubic-bezier(.22, 1, .36, 1)}*,:before,:after{box-sizing:border-box}html,body{height:100%}body{font-family:var(--font-sans);color:var(--text-primary);background:var(--bg-app);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;margin:0}button,textarea{font:inherit}button{cursor:pointer;color:inherit;background:0 0;border:none}ul{margin:0;padding:0;list-style:none}.app{background:radial-gradient(1200px 600px at 10% -10%, #3b6fff14, transparent 55%), radial-gradient(900px 500px at 100% 0%, #78aaff0f, transparent 50%), var(--bg-app);height:100%;min-height:100vh;display:flex}.sidebar{width:var(--sidebar-width);background:var(--bg-sidebar);border-right:1px solid var(--border-subtle);transition:transform .28s var(--ease), opacity .28s var(--ease);z-index:20;flex-direction:column;flex-shrink:0;gap:16px;padding:14px 12px;display:flex}.sidebar__top{padding:4px 2px 0}.btn-new-chat{background:var(--bg-main);border:1px solid var(--border-strong);width:100%;height:42px;color:var(--text-primary);transition:background .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);border-radius:999px;justify-content:center;align-items:center;gap:8px;font-size:14px;font-weight:560;display:inline-flex}.btn-new-chat:hover{background:var(--accent-soft);border-color:#3b6fff59}.btn-new-chat:active{transform:scale(.98)}.btn-new-chat__icon{color:var(--accent);display:inline-flex}.sidebar__section{flex-direction:column;flex:1;gap:8px;min-height:0;display:flex;overflow:hidden}.sidebar__label{color:var(--text-tertiary);letter-spacing:.02em;padding:0 10px;font-size:12px}.session-list{flex-direction:column;gap:2px;padding:0 2px 8px;display:flex;overflow-y:auto}.session-item{text-align:left;border-radius:var(--radius-md);width:100%;color:var(--text-secondary);transition:background .18s var(--ease), color .18s var(--ease);align-items:center;gap:8px;padding:10px 12px;font-size:13.5px;line-height:1.35;display:flex}.session-item:hover{background:var(--bg-hover);color:var(--text-primary)}.session-item.is-active{background:var(--bg-active);color:var(--accent);font-weight:560}.session-item__title{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.sidebar__footer{border-top:1px solid var(--border-subtle);padding-top:8px}.user-chip{border-radius:var(--radius-md);align-items:center;gap:10px;padding:8px 10px;display:flex}.user-chip__avatar{color:#fff;background:linear-gradient(145deg,#6b8cff,#3b6fff);border-radius:50%;place-items:center;width:34px;height:34px;font-size:13px;font-weight:650;display:grid}.user-chip__name{text-overflow:ellipsis;white-space:nowrap;font-size:13.5px;font-weight:560;overflow:hidden}.user-chip__meta{flex:1;min-width:0}.user-chip__hint{color:var(--text-tertiary);margin-top:2px;font-size:11.5px}.user-chip__action{background:var(--accent);color:#fff;border-radius:999px;flex-shrink:0;height:28px;padding:0 10px;font-size:12px;font-weight:600}.user-chip__action:hover{background:var(--accent-hover)}.user-chip__action.is-quiet{color:var(--text-secondary);border:1px solid var(--border-strong);background:0 0}.user-chip__action.is-quiet:hover{background:var(--bg-hover);color:var(--text-primary)}.sidebar-toggle{z-index:30;background:var(--bg-main);border:1px solid var(--border-subtle);width:40px;height:40px;box-shadow:var(--shadow-composer);color:var(--text-secondary);border-radius:12px;display:none;position:fixed;top:12px;left:12px}.main{background:0 0;flex-direction:column;flex:1;min-width:0;display:flex;position:relative}.main__header{height:var(--header-height);border-bottom:1px solid #0000;justify-content:space-between;align-items:center;padding:0 24px;display:flex}.brand-inline{align-items:center;gap:8px;display:inline-flex}.brand-mark{background:linear-gradient(145deg,#7aa2ff 0%,#3b6fff 55%,#2a4fd6 100%);border-radius:6px;width:18px;height:18px;box-shadow:0 4px 10px #3b6fff59}.brand-name{letter-spacing:.02em;font-size:15px;font-weight:650}.icon-btn{width:36px;height:36px;color:var(--text-secondary);transition:background .18s var(--ease), color .18s var(--ease);border-radius:10px;place-items:center;display:grid}.icon-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.welcome{animation:fade-up .45s var(--ease) both;flex:1;place-items:center;padding:24px 24px 8px;display:grid}.welcome__inner{text-align:center;width:min(100%,720px)}.welcome__logo{align-items:center;gap:12px;margin-bottom:22px;display:inline-flex}.welcome__logo-orb{background:radial-gradient(circle at 30% 30%,#a8c0ff,#0000 45%),linear-gradient(145deg,#6b8cff,#3b6fff 60%,#2446c9);border-radius:14px;width:42px;height:42px;animation:4.5s ease-in-out infinite float-soft;box-shadow:0 10px 28px #3b6fff47}.welcome__logo-text{letter-spacing:.04em;background:linear-gradient(120deg,#1f2329 20%,#3b6fff 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#3b6fff14}.suggest-card__tag{color:var(--accent);font-size:12px;font-weight:600}.suggest-card__text{color:var(--text-secondary);font-size:13.5px;line-height:1.45}.chat{flex-direction:column;flex:1;min-height:0;display:flex}.chat__scroll{flex:1;padding:8px 24px 12px;overflow-y:auto}.chat__thread{width:min(100%, var(--content-max));flex-direction:column;gap:28px;margin:0 auto;padding:12px 0 24px;display:flex}.message{animation:fade-up .35s var(--ease) both;grid-template-columns:36px 1fr;align-items:start;gap:14px;display:grid}.message__avatar{border-radius:12px;flex-shrink:0;place-items:center;width:36px;height:36px;font-size:12px;font-weight:700;display:grid}.message--user .message__avatar{color:var(--text-secondary);background:#eef1f6}.message--assistant .message__avatar{color:#fff;background:linear-gradient(145deg,#6b8cff,#3b6fff);box-shadow:0 6px 14px #3b6fff40}.message__body{min-width:0;padding-top:6px}.message__role{color:var(--text-tertiary);margin-bottom:6px;font-size:12px;font-weight:550}.message__content{color:var(--text-primary);white-space:pre-wrap;word-break:break-word;font-size:15px;line-height:1.75}.message__content p{margin:0 0 .85em}.message__content p:last-child{margin-bottom:0}.message__content strong{font-weight:650}.message__content code{background:#f2f4f8;border-radius:5px;padding:.1em .35em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em}.message__content pre{color:#e2e8f0;background:#0f172a;border-radius:12px;margin:.75em 0;padding:14px 16px;font-size:13px;line-height:1.55;overflow-x:auto}.message__content pre code{color:inherit;background:0 0;padding:0}.message__content ul{margin:.4em 0 .8em;padding-left:1.2em;list-style:outside}.message__content li{margin:.25em 0}.typing{align-items:center;gap:5px;height:18px;display:inline-flex}.typing span{background:var(--accent);opacity:.45;border-radius:50%;width:6px;height:6px;animation:1.1s ease-in-out infinite blink}.typing span:nth-child(2){animation-delay:.15s}.typing span:nth-child(3){animation-delay:.3s}.composer-wrap{padding:0 24px 18px}.composer{width:min(100%, var(--content-max));margin:0 auto}.composer__box{background:var(--bg-composer);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);box-shadow:var(--shadow-composer);transition:border-color .2s var(--ease), box-shadow .2s var(--ease);padding:12px 14px 10px}.composer__box:focus-within{border-color:#3b6fff73;box-shadow:0 10px 30px #3b6fff1f,0 1px 2px #1f23290a}.composer__input{resize:none;width:100%;color:var(--text-primary);background:0 0;border:none;outline:none;min-height:44px;max-height:160px;padding:4px 4px 8px;font-size:15px;line-height:1.55}.composer__input::placeholder{color:var(--text-tertiary)}.composer__toolbar{justify-content:space-between;align-items:center;gap:12px;display:flex}.composer__hints{align-items:center;gap:10px;min-width:0;display:flex}.pill{color:var(--accent);background:var(--accent-soft);border-radius:999px;padding:3px 8px;font-size:11.5px;font-weight:600}.composer__count{color:var(--text-tertiary);font-size:12px}.composer__actions{align-items:center;gap:8px;display:flex}.btn-send{background:var(--accent);color:#fff;width:36px;height:36px;transition:background .18s var(--ease), opacity .18s var(--ease), transform .18s var(--ease);border-radius:50%;place-items:center;display:grid}.btn-send:hover:not(:disabled){background:var(--accent-hover)}.btn-send:active:not(:disabled){transform:scale(.96)}.btn-send:disabled{opacity:.35;cursor:not-allowed}.btn-stop{border:1px solid var(--border-strong);height:32px;color:var(--text-secondary);background:#fff;border-radius:999px;padding:0 12px;font-size:13px}.btn-stop:hover{color:var(--danger);border-color:#e5484d73}.composer__disclaimer{text-align:center;color:var(--text-tertiary);margin:10px 0 0;font-size:12px}.toast{color:#fff;z-index:50;animation:fade-up .25s var(--ease);background:#1f2329eb;border-radius:999px;padding:10px 16px;font-size:13px;position:fixed;bottom:28px;left:50%;transform:translate(-50%)}@keyframes fade-up{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes float-soft{0%,to{transform:translateY(0)}50%{transform:translateY(-4px)}}@keyframes blink{0%,to{opacity:.3;transform:translateY(0)}50%{opacity:1;transform:translateY(-2px)}}@media (width<=860px){.sidebar{height:100%;position:fixed;inset:0 auto 0 0;transform:translate(-105%);box-shadow:8px 0 30px #0f172a14}.app.sidebar-open .sidebar{transform:translate(0)}.sidebar-toggle{place-items:center;display:grid}.main__header{padding-left:64px}.suggest-grid{grid-template-columns:1fr}.welcome__desc{font-size:14px}}@media (width<=480px){.composer-wrap,.chat__scroll,.welcome{padding-left:14px;padding-right:14px}.message{grid-template-columns:30px 1fr;gap:10px}.message__avatar{border-radius:10px;width:30px;height:30px}}.session-item__actions{gap:2px;margin-left:auto;display:none}.session-item:hover .session-item__actions{display:inline-flex}.session-action{width:20px;height:20px;color:var(--text-tertiary);border-radius:6px;place-items:center;font-size:13px;line-height:1;display:inline-grid}.session-action:hover{background:var(--bg-hover);color:var(--text-primary)}.message__refs{border-top:1px dashed #0f172a1f;margin-top:10px;padding-top:8px}.message__refs-title{color:var(--text-tertiary);margin-bottom:4px;font-size:12px}.message__refs ol{margin:0;padding-left:1.1em}.message__refs li{color:var(--text-secondary);margin:2px 0;font-size:12.5px}.message__refs a{color:var(--accent);text-decoration:none}.message__refs a:hover{text-decoration:underline}.message--error .message__content{color:var(--danger)}.auth-modal{z-index:40;place-items:center;padding:24px;display:grid;position:fixed;inset:0}.auth-modal[hidden]{display:none}.auth-modal__backdrop{background:#0f172a59;position:absolute;inset:0}.auth-modal__panel{border-radius:var(--radius-xl);background:var(--bg-main);width:min(400px,100%);box-shadow:var(--shadow-composer);padding:22px 22px 20px;position:relative}.auth-modal__close{width:32px;height:32px;color:var(--text-tertiary);border-radius:10px;font-size:20px;line-height:1;position:absolute;top:12px;right:12px}.auth-modal__close:hover{background:var(--bg-hover);color:var(--text-primary)}.auth-modal__tabs{background:var(--bg-sidebar);border-radius:999px;gap:4px;padding:3px;display:inline-flex}.auth-tab{height:30px;color:var(--text-secondary);border-radius:999px;padding:0 14px;font-size:13px}.auth-tab.is-active{background:var(--bg-main);color:var(--text-primary);font-weight:600;box-shadow:0 1px 2px #1f23290f}.auth-modal__title{margin:18px 0 6px;font-size:20px;font-weight:650}.auth-modal__hint{color:var(--text-tertiary);margin:0 0 16px;font-size:12.5px;line-height:1.5}.auth-form{flex-direction:column;gap:12px;display:flex}.auth-field{color:var(--text-secondary);flex-direction:column;gap:6px;font-size:13px;display:flex}.auth-field[hidden]{display:none}.auth-field input{border:1px solid var(--border-strong);border-radius:var(--radius-md);background:var(--bg-main);height:40px;color:var(--text-primary);font:inherit;padding:0 12px}.auth-field input:focus{box-shadow:0 0 0 3px var(--accent-soft);border-color:#3b6fff8c;outline:none}.auth-form__error{color:var(--danger);margin:0;font-size:12.5px}.auth-form__error[hidden]{display:none}.auth-code-row{gap:8px;display:flex}.auth-code-row input{flex:1}.auth-send-code{border-radius:var(--radius-md);border:1px solid var(--border-strong);background:var(--bg-main);height:40px;color:var(--text-primary);white-space:nowrap;font:inherit;padding:0 12px}.auth-send-code:disabled{opacity:.65}altcha-widget{color:var(--text-secondary);align-items:center;gap:8px;font-size:13px;display:flex}.auth-captcha-btn{border-radius:var(--radius-md);border:1px solid var(--border-strong);background:var(--bg-main);height:36px;color:var(--text-primary);font:inherit;padding:0 12px}.auth-submit{background:var(--accent);color:#fff;border-radius:999px;height:40px;margin-top:4px;font-weight:600}.auth-submit:hover{background:var(--accent-hover)}