/* Shared visual tokens and accessible controls. */
:root {
    color-scheme: light;
    --page: #edf1f7;
    --surface: #ffffff;
    --surface-soft: #f6f8fc;
    --surface-hover: #edf2fa;
    --text: #19263d;
    --secondary: #566780;
    --muted: #64748b;
    --border: #e2e8f1;
    --brand: #315fd5;
    --brand-hover: #254fbe;
    --brand-soft: #edf2ff;
    --brand-text: #315fd5;
    --success: #148462;
    --success-soft: #eaf7f1;
    --danger: #c74650;
    --danger-soft: #fff0f1;
    --shadow: 0 10px 40px rgba(28, 47, 80, .06);
}
body.dark {
    color-scheme: dark;
    --page: #0c1422;
    --surface: #151f30;
    --surface-soft: #1a273c;
    --surface-hover: #21314b;
    --text: #e7eef9;
    --secondary: #b2c0d5;
    --muted: #95a5bd;
    --border: #2a3a53;
    --brand: #426bd4;
    --brand-hover: #4772db;
    --brand-soft: #223759;
    --brand-text: #a6c2ff;
    --success: #75d7b3;
    --success-soft: #193b35;
    --danger: #ff9ca4;
    --danger-soft: #412b38;
    --shadow: 0 10px 40px rgba(0, 0, 0, .2);
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--page);
    font-size: 14px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
button, input, textarea { font: inherit; }
button, a, input, textarea { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
button:disabled { cursor: wait; opacity: .65; }
button, input, textarea, a { outline-offset: 3px; }
:focus-visible { outline: 3px solid #92b3ff; }
button { transition: background .16s, border-color .16s, color .16s, box-shadow .16s; }
a { color: var(--brand-text); }
h1, h2, h3, h4, p { margin: 0; }
svg { display: block; flex-shrink: 0; }
[hidden] { display: none !important; }
::selection { background: #cddcff; color: #122b59; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; color: var(--text); }
.brand-mark {
    display: grid; place-items: center; width: 38px; height: 38px;
    background: var(--brand); color: white; border-radius: 11px; flex-shrink: 0;
}
.brand-mark svg { width: 23px; height: 23px; }
.brand-name { font-size: 17px; font-weight: 700; letter-spacing: .02em; line-height: 1.3; }
.brand-caption { display: block; color: var(--muted); font-size: 9px; font-weight: 600; letter-spacing: .12em; margin-top: 3px; }
.eyebrow { font-size: 11px; font-weight: 600; letter-spacing: .1em; color: var(--brand-text); }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--success); display: inline-block; flex-shrink: 0; }
.icon-button {
    display: inline-grid; place-items: center; width: 36px; height: 36px;
    border: 1px solid var(--border); border-radius: 9px; color: var(--secondary); background: var(--surface);
}
.icon-button:hover { color: var(--brand-text); background: var(--brand-soft); }
.text-button { border: 0; padding: 5px 0; background: transparent; color: var(--brand-text); font-size: 12px; }
.emoji-control { position: relative; flex-shrink: 0; }
.emoji-picker { position: absolute; bottom: calc(100% + 12px); left: 0; z-index: 20; display: grid; grid-template-columns: repeat(5, 1fr); width: 230px; padding: 10px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); box-shadow: var(--shadow); }
.emoji-picker button { border: 0; border-radius: 6px; background: transparent; font-size: 22px; padding: 6px; }
.emoji-picker button:hover { background: var(--surface-hover); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.empty-caption { color: var(--muted); font-size: 12px; line-height: 1.8; }
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-thumb { background: #b7c3d5; border-radius: 10px; }
::-webkit-scrollbar-track { background: transparent; }
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}