/* Sharing · shared tokens and chat page. System fonts only, no external assets. */
:root{
  --bg:#f5f4fb;--bg-grad:radial-gradient(1200px 600px at 100% -10%,#e6ecff 0,transparent 60%),radial-gradient(900px 500px at -10% 110%,#efe8ff 0,transparent 55%);
  --surface:#ffffff;--surface-2:#f8f7fd;--ink:#1c1a2e;--muted:#6a6782;--faint:#9a97b0;--line:#e5e2f0;--line-strong:#d4d0e6;
  --accent:#6a5cff;--accent-ink:#ffffff;--accent-soft:#eeebff;--accent-2:#3d9bff;
  --user:#6a5cff;--user-ink:#fff;
  --danger:#cf3f4f;--danger-soft:#fdecee;--success:#1d936a;--success-soft:#e5f6ef;--warn:#b7791f;--warn-soft:#fdf3e1;
  --radius:18px;--radius-sm:12px;--shadow:0 1px 2px rgba(28,26,46,.05),0 8px 24px rgba(28,26,46,.06);
  --font:system-ui,-apple-system,"Segoe UI","PingFang TC","Microsoft JhengHei","Noto Sans TC",sans-serif;
  --mono:ui-monospace,"Cascadia Code",Consolas,"SF Mono",monospace;
  --app-h:100dvh;color-scheme:light;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#11111c;--bg-grad:radial-gradient(1200px 600px at 100% -10%,#1d2147 0,transparent 60%),radial-gradient(900px 500px at -10% 110%,#241b45 0,transparent 55%);
  --surface:#1a1a29;--surface-2:#202032;--ink:#ecebf6;--muted:#a3a0bb;--faint:#77748f;--line:#2b2a40;--line-strong:#3a3854;
  --accent:#8b80ff;--accent-ink:#13121f;--accent-soft:#25223f;--accent-2:#62b0ff;--user:#7466ff;--user-ink:#fff;
  --danger:#ff7b88;--danger-soft:#3a1e27;--success:#4fd1a1;--success-soft:#173229;--warn:#f1b65a;--warn-soft:#352a17;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.25);color-scheme:dark;
}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
html,body{margin:0;min-height:100%}
body{font:16px/1.6 var(--font);color:var(--ink);background:var(--bg);background-image:var(--bg-grad);background-attachment:fixed;-webkit-font-smoothing:antialiased}
button,input,select,textarea{font:inherit;color:inherit}
button,a,input,select,textarea{touch-action:manipulation}
button{cursor:pointer;-webkit-tap-highlight-color:transparent}
button:disabled{cursor:not-allowed;opacity:.5}
a{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
[hidden]{display:none!important}
.sprite{position:absolute;width:0;height:0;overflow:hidden}

/* Brand */
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.01em;color:var(--ink);text-decoration:none;font-size:17px}
.brand-mark{width:30px;height:30px;border-radius:9px;background:url(/icon.svg?v=4) center/cover;flex:none;box-shadow:0 4px 12px rgba(106,92,255,.3)}
.eyebrow{font-size:12px;font-weight:600;letter-spacing:.08em;color:var(--accent);text-transform:uppercase}
.muted{color:var(--muted)}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;padding:0 14px;border-radius:12px;border:1px solid var(--line-strong);background:var(--surface);font-size:14px;font-weight:600;white-space:nowrap;text-decoration:none;color:var(--ink);transition:background .15s,border-color .15s,transform .1s}
.btn:hover:not(:disabled){background:var(--surface-2);border-color:var(--faint)}
.btn:active:not(:disabled){transform:scale(.97)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn.primary:hover:not(:disabled){filter:brightness(1.07);background:var(--accent)}
.btn.ghost{border-color:transparent;background:transparent}
.btn.ghost:hover:not(:disabled){background:var(--accent-soft)}
.btn.danger{color:var(--danger)}
.icon{width:18px;height:18px;flex:none;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* ---------- Chat page ---------- */
.chat-page{overflow:hidden;overscroll-behavior:none;height:100%}
.app{position:fixed;inset:0 0 auto 0;height:var(--app-h);display:flex;flex-direction:column}
.topbar{flex:none;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;padding-top:max(10px,env(safe-area-inset-top));padding-left:max(16px,env(safe-area-inset-left));padding-right:max(16px,env(safe-area-inset-right));border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--surface) 82%,transparent);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);z-index:5}
.topbar-left{display:flex;align-items:center;gap:12px;min-width:0}
.title-block{display:flex;flex-direction:column;min-width:0;line-height:1.25}
.title-block strong{font-size:15px}
.status{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:46vw}
.status::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--faint);flex:none}
.status[data-state="ok"]::before{background:var(--success)}
.status[data-state="busy"]::before{background:var(--accent);animation:pulse 1.2s ease-in-out infinite}
.status[data-state="error"]::before{background:var(--danger)}
.topbar-actions{display:flex;align-items:center;gap:6px;flex:none}

.panel{position:relative;flex:1;min-height:0;display:flex;flex-direction:column}
.messages{flex:1;min-height:0;overflow-y:auto;overscroll-behavior:contain;-webkit-overflow-scrolling:touch;padding:20px 16px 12px}
.thread{max-width:780px;margin:0 auto;display:flex;flex-direction:column;gap:18px}

/* Mascot: decorative. Large in the empty state, peeking from the panel corner on wide screens. */
.mascot-peek{position:absolute;right:max(8px,calc((100% - 780px)/2 - 260px));bottom:0;width:240px;max-height:64%;object-fit:contain;object-position:bottom;pointer-events:none;user-select:none;z-index:0;filter:drop-shadow(0 10px 30px rgba(106,92,255,.18));display:none}
.has-messages .mascot-peek{display:block}
@media (max-width:1279px){.has-messages .mascot-peek{display:none}}
.messages,.composer-wrap{position:relative;z-index:1}

/* Welcome / empty state */
.welcome{display:grid;grid-template-columns:1fr auto;align-items:end;gap:8px 24px;padding:8px 0 4px}
.welcome-copy{padding-bottom:12px}
.welcome h1{font-size:clamp(26px,4.6vw,38px);line-height:1.2;letter-spacing:-.02em;margin:8px 0 10px}
.welcome p{margin:0;color:var(--muted)}
.welcome-mascot{width:clamp(150px,24vw,250px);height:auto;max-height:44vh;object-fit:contain;filter:drop-shadow(0 12px 30px rgba(106,92,255,.22));pointer-events:none;user-select:none}
.suggestions{grid-column:1/-1;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px;margin-top:8px}
.suggestions button{display:flex;flex-direction:column;align-items:flex-start;gap:2px;text-align:left;padding:14px 16px;border-radius:var(--radius-sm);border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow);transition:border-color .15s,transform .1s}
.suggestions button:hover:not(:disabled){border-color:var(--accent)}
.suggestions button:active:not(:disabled){transform:scale(.98)}
.suggestions strong{font-size:14px}
.suggestions span{font-size:13px;color:var(--muted)}
.privacy-note{grid-column:1/-1;display:flex;gap:8px;align-items:flex-start;margin-top:6px;padding:12px 14px;border-radius:var(--radius-sm);background:var(--accent-soft);font-size:13px;color:var(--muted)}
.privacy-note .icon{color:var(--accent);margin-top:2px}

/* Messages */
.message{display:flex;gap:10px;animation:rise .22s ease-out}
.message.user{flex-direction:column;align-items:flex-end;gap:0}
.avatar{width:30px;height:30px;border-radius:50%;flex:none;background:linear-gradient(135deg,var(--accent-2),var(--accent));display:grid;place-items:center;color:#fff;font-size:11px;font-weight:700;margin-top:2px}
.message.user .bubble{background:var(--user);color:var(--user-ink);padding:10px 14px;border-radius:18px 18px 6px 18px;white-space:pre-wrap;overflow-wrap:anywhere;max-width:min(85%,600px)}
.message.assistant .bubble{flex:1;min-width:0}
.meta{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--faint);margin-bottom:2px}
.content{overflow-wrap:anywhere}
.content>:first-child{margin-top:0}.content>:last-child{margin-bottom:0}
.content p{margin:0 0 .7em}
.content h3,.content h4{margin:1em 0 .4em;font-size:1.02em}
.content ul,.content ol{margin:0 0 .7em;padding-left:1.4em}
.content li{margin:.2em 0}
.content code{font-family:var(--mono);font-size:.88em;background:var(--surface-2);border:1px solid var(--line);padding:.1em .35em;border-radius:6px}
.content pre{margin:.6em 0 .9em;background:#16152a;color:#e9e7ff;border-radius:12px;padding:14px;overflow-x:auto;font-size:13.5px;line-height:1.55}
.content pre code{background:none;border:0;padding:0;color:inherit;font-size:inherit}
.content blockquote{margin:0 0 .7em;padding:.2em 0 .2em 12px;border-left:3px solid var(--line-strong);color:var(--muted)}
.files{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px;justify-content:flex-end}
.file-chip{display:inline-flex;align-items:center;gap:6px;max-width:100%;padding:4px 6px 4px 10px;border-radius:999px;font-size:12.5px;background:var(--surface);border:1px solid var(--line);color:var(--muted)}
.file-chip .icon{width:14px;height:14px}
.file-chip span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:190px}
.file-chip small{color:var(--faint)}
.file-chip button{border:0;background:none;width:24px;height:24px;border-radius:50%;color:var(--faint);font-size:16px;line-height:1;display:grid;place-items:center}
.file-chip button:hover{background:var(--accent-soft);color:var(--accent)}
.msg-actions{display:flex;gap:4px;margin-top:4px}
.msg-actions button{border:0;background:none;color:var(--faint);font-size:12px;padding:4px 8px;border-radius:8px;min-height:28px}
.msg-actions button:hover{background:var(--accent-soft);color:var(--accent)}

/* Waiting */
.typing{display:inline-flex;align-items:center;gap:10px;padding:10px 14px;border-radius:16px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);font-size:14px;color:var(--muted)}
.dots{display:inline-flex;gap:4px}
.dots i{width:7px;height:7px;border-radius:50%;background:var(--accent);opacity:.35;animation:blink 1.2s infinite}
.dots i:nth-child(2){animation-delay:.2s}.dots i:nth-child(3){animation-delay:.4s}

/* Inline notices (error / offline / disabled) */
.notice-card{display:flex;gap:12px;align-items:flex-start;padding:14px 16px;border-radius:var(--radius-sm);border:1px solid var(--line);background:var(--surface);box-shadow:var(--shadow)}
.notice-card.error{border-color:color-mix(in srgb,var(--danger) 40%,var(--line));background:var(--danger-soft)}
.notice-card.warn{border-color:color-mix(in srgb,var(--warn) 40%,var(--line));background:var(--warn-soft)}
.notice-card .icon{margin-top:3px}
.notice-card.error .icon{color:var(--danger)}.notice-card.warn .icon{color:var(--warn)}
.notice-card strong{display:block;font-size:14.5px}
.notice-card p{margin:2px 0 0;font-size:14px;color:var(--muted)}
.notice-card .btn{margin-top:10px}

/* Composer */
.composer-wrap{flex:none;padding:8px 12px calc(10px + env(safe-area-inset-bottom));padding-left:max(12px,env(safe-area-inset-left));padding-right:max(12px,env(safe-area-inset-right))}
.composer-inner{max-width:780px;margin:0 auto}
.banner{display:flex;align-items:center;gap:10px;margin:0 0 8px;padding:10px 12px;border-radius:12px;font-size:14px;line-height:1.45;background:var(--danger-soft);color:var(--danger);border:1px solid color-mix(in srgb,var(--danger) 30%,transparent)}
.banner.warn{background:var(--warn-soft);color:var(--warn);border-color:color-mix(in srgb,var(--warn) 30%,transparent)}
.banner .grow{flex:1;min-width:0}
.banner .btn{min-height:34px;padding:0 12px;font-size:13px}
.error:empty{display:none}
#composer{border:1px solid var(--line-strong);border-radius:22px;background:var(--surface);box-shadow:var(--shadow);padding:8px 8px 8px 14px;transition:border-color .15s,box-shadow .15s}
#composer:focus-within{border-color:var(--accent);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent) 16%,transparent),var(--shadow)}
#composer.dragging{border-style:dashed;border-color:var(--accent);background:var(--accent-soft)}
#composer.locked{background:var(--surface-2)}
.pending-files{display:flex;flex-wrap:wrap;gap:6px;padding:4px 0 6px}
.pending-files:empty{display:none}
#input{display:block;width:100%;border:0;outline:0;background:transparent;resize:none;padding:6px 4px 4px 0;min-height:28px;max-height:38vh;font-size:16px;line-height:1.5}
#input::placeholder{color:var(--faint)}
.composer-bottom{display:flex;align-items:center;gap:6px;margin-top:4px}
.tool-btn{width:38px;height:38px;border-radius:12px;border:0;background:transparent;color:var(--muted);display:grid;place-items:center;flex:none}
.tool-btn:hover:not(:disabled){background:var(--accent-soft);color:var(--accent)}
.model-picker{position:relative;min-width:0;flex:0 1 auto}
.model-picker select{appearance:none;-webkit-appearance:none;width:100%;max-width:min(52vw,280px);height:34px;padding:0 28px 0 12px;border-radius:999px;border:1px solid var(--line);background:var(--surface-2);font-size:13px;font-weight:600;color:var(--ink);text-overflow:ellipsis;cursor:pointer}
.model-picker::after{content:"";position:absolute;right:12px;top:50%;width:6px;height:6px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:translateY(-70%) rotate(45deg);pointer-events:none}
.hint{font-size:12px;color:var(--faint);margin-left:auto;white-space:nowrap}
.send-btn{width:40px;height:40px;border-radius:14px;border:0;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;flex:none;margin-left:auto;transition:transform .1s,filter .15s}
.hint+.send-btn,.hint+.send-btn+.send-btn{margin-left:4px}
.send-btn:hover:not(:disabled){filter:brightness(1.08)}
.send-btn:active:not(:disabled){transform:scale(.94)}
.send-btn.stop{background:var(--ink);color:var(--surface)}
.footnote{text-align:center;font-size:11.5px;color:var(--faint);margin:6px 0 0}

@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
@keyframes blink{0%,80%,100%{opacity:.25}40%{opacity:1}}
@keyframes pulse{50%{opacity:.35}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* Mobile */
@media (max-width:640px){
  .topbar{padding-top:max(8px,env(safe-area-inset-top));padding-bottom:8px}
  .btn-label{display:none}
  .topbar .btn{min-width:40px;padding:0 10px}
  .messages{padding:14px 12px 8px}
  .welcome{grid-template-columns:1fr;justify-items:center;text-align:center}
  .welcome-mascot{grid-row:1;width:min(44vw,180px);max-height:28vh}
  .welcome-copy{padding-bottom:0}
  .suggestions{grid-template-columns:1fr;width:100%}
  .suggestions button{flex-direction:row;justify-content:space-between;align-items:center;padding:12px 14px}
  .suggestions span{display:none}
  .privacy-note{text-align:left}
  .hint{display:none}
  .avatar{width:26px;height:26px}
  .message.user .bubble{max-width:88%}
  .footnote{display:none}
  .keyboard-open .welcome-mascot,.keyboard-open .privacy-note{display:none}
}
@media (max-height:520px){.welcome-mascot{display:none}.welcome{grid-template-columns:1fr}}