/* ==========================================================================
   Party Sync — web client styles (implements UI_DESIGN_SPEC.md)
   1. Tokens (dark default, light via OS or [data-theme])   2. Base
   3. Controls   4. Top bar   5. Landing   6. Party (stage, SyncBar, panel)
   7. Ended   8. Modals & toasts   9. Motion   10. Breakpoints
   ========================================================================== */

/* ---------------------------------------------------------------- 1. tokens */
:root {
  --brand: #7c5cff;
  --brand-hover: #8f72ff;
  --brand-weak: #2a2350;
  --brand-ink: #ffffff;
  --accent: #36e0c0;

  --bg: #0e0e13;
  --surface-1: #16161f;
  --surface-2: #1e1e2a;
  --surface-3: #2a2a3a;
  --border: #2d2d3c;
  --text: #f2f2f7;
  --text-muted: #a0a0b2;
  --text-faint: #8a8a9e; /* lightened from spec #6b6b7e to keep 4.5:1 on surfaces */

  --success: #3ad686;
  --warning: #ffb24c;
  --danger: #ff5c6c;
  --info: #4da9ff;

  --shadow-1: none;
  --shadow-2: none;
  --overlay: rgb(8 8 12 / 0.86);
  --scrim: rgb(0 0 0 / 0.6);
  --topbar-bg: rgb(14 14 19 / 0.82);

  --font: 'Inter', -apple-system, system-ui, 'Segoe UI', Roboto, sans-serif;
  --mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --t-display: 700 1.75rem/2.125rem var(--font);
  --t-h1: 700 1.375rem/1.75rem var(--font);
  --t-h2: 600 1.125rem/1.5rem var(--font);
  --t-body: 400 0.9375rem/1.375rem var(--font);
  --t-label: 500 0.875rem/1.25rem var(--font);
  --t-caption: 500 0.75rem/1rem var(--font);

  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px; --s-5: 24px; --s-6: 32px; --s-8: 48px; --s-10: 64px;
  --r-sm: 8px; --r-md: 12px; --r-lg: 16px; --r-full: 999px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --d-fast: 120ms; --d-base: 200ms; --d-slow: 320ms;

  --topbar-h: 60px;
  --gutter: 16px;
  --rail-w: 360px;
  color-scheme: dark;
}

/* Light tokens: applied when the OS prefers light (unless forced dark) or when forced light. */
@media (prefers-color-scheme: light) {
  :root:not([data-theme='dark']) {
    --brand: #6a46f0; --brand-hover: #5b38d6; --brand-weak: #ece8ff; --accent: #0fb89b;
    --bg: #f7f7fb; --surface-1: #ffffff; --surface-2: #f0f0f6; --surface-3: #e4e4ee; --border: #e2e2ec;
    --text: #16161f; --text-muted: #5a5a6c; --text-faint: #6e6e80;
    --success: #13a866; --warning: #c77800; --danger: #d93345; --info: #2b7fd6;
    --shadow-1: 0 1px 2px rgb(0 0 0 / 0.06); --shadow-2: 0 8px 24px rgb(0 0 0 / 0.12);
    --overlay: rgb(247 247 251 / 0.9); --scrim: rgb(22 22 31 / 0.4); --topbar-bg: rgb(247 247 251 / 0.85);
    color-scheme: light;
  }
}
:root[data-theme='light'] {
  --brand: #6a46f0; --brand-hover: #5b38d6; --brand-weak: #ece8ff; --accent: #0fb89b;
  --bg: #f7f7fb; --surface-1: #ffffff; --surface-2: #f0f0f6; --surface-3: #e4e4ee; --border: #e2e2ec;
  --text: #16161f; --text-muted: #5a5a6c; --text-faint: #6e6e80;
  --success: #13a866; --warning: #c77800; --danger: #d93345; --info: #2b7fd6;
  --shadow-1: 0 1px 2px rgb(0 0 0 / 0.06); --shadow-2: 0 8px 24px rgb(0 0 0 / 0.12);
  --overlay: rgb(247 247 251 / 0.9); --scrim: rgb(22 22 31 / 0.4); --topbar-bg: rgb(247 247 251 / 0.85);
  color-scheme: light;
}

/* ---------------------------------------------------------------- 2. base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100dvh;
  font: var(--t-body);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.modal-open { overflow: hidden; }
h1, h2, h3, p, dl, dd { margin: 0; }
button, input, textarea { font: inherit; color: inherit; }
a { color: var(--brand); }
[hidden], .hidden { display: none !important; }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }
.sr-only {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.muted { color: var(--text-muted); }
.icon { flex: none; display: block; }
[data-icon] { display: inline-flex; }
code, kbd { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.stack { display: flex; flex-direction: column; gap: var(--s-4); }

.skip-link {
  position: absolute; left: var(--s-3); top: -48px; z-index: 100;
  padding: var(--s-2) var(--s-4); border-radius: var(--r-sm);
  background: var(--brand); color: var(--brand-ink); font: var(--t-label); text-decoration: none;
}
.skip-link:focus { top: var(--s-3); }

.app { min-height: 100dvh; display: flex; flex-direction: column; }
main { flex: 1; display: flex; flex-direction: column; outline: none; }

/* ---------------------------------------------------------------- 3. controls */
.btn {
  position: relative;
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
  min-height: 44px; padding: 0 var(--s-4);
  border-radius: var(--r-sm); border: 1px solid transparent;
  background: var(--brand); color: var(--brand-ink);
  font: var(--t-label); font-weight: 600; text-decoration: none; white-space: nowrap;
  cursor: pointer; user-select: none;
  transition: background var(--d-fast), border-color var(--d-fast), color var(--d-fast), transform var(--d-fast), opacity var(--d-fast);
}
.btn:hover { background: var(--brand-hover); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.6; pointer-events: none; }
.btn--secondary { background: transparent; border-color: var(--border); color: var(--text); }
.btn--secondary:hover { background: var(--surface-2); }
.btn--ghost { background: transparent; color: var(--text-muted); }
.btn--ghost:hover { background: var(--surface-2); color: var(--text); transform: none; }
.btn--danger-outline { background: transparent; border-color: color-mix(in srgb, var(--danger) 45%, transparent); color: var(--danger); }
.btn--danger-outline:hover { background: color-mix(in srgb, var(--danger) 12%, transparent); }
.btn--icon { width: 44px; padding: 0; flex: none; }
.btn--sm { min-height: 36px; padding: 0 var(--s-3); font-size: 0.8125rem; }
.btn--icon.btn--sm { width: 36px; padding: 0; }
.btn--block { width: 100%; }
.btn--lg { min-height: 50px; padding: 0 var(--s-5); font-size: 1rem; }
.btn--attention { border-color: var(--warning); color: var(--warning); }

/* Loading: spinner replaces the label, button keeps its width. */
.btn.is-busy > * { visibility: hidden; }
.btn.is-busy::after {
  content: ''; position: absolute; width: 18px; height: 18px; border-radius: 50%;
  border: 2px solid currentColor; border-right-color: transparent;
  animation: spin 0.7s linear infinite;
}

.field { display: flex; flex-direction: column; gap: 6px; }
.field__label { font: var(--t-label); color: var(--text-muted); }
.field__hint { font: var(--t-caption); font-weight: 400; color: var(--text-faint); }
.field__error { font: var(--t-label); font-weight: 400; color: var(--danger); }
.field__error:empty { display: none; }

.input {
  width: 100%; min-height: 44px; padding: 10px 14px;
  border-radius: var(--r-sm); border: 1px solid var(--border);
  background: var(--surface-2); font-size: 0.9375rem;
  transition: border-color var(--d-fast), box-shadow var(--d-fast);
}
.input::placeholder { color: var(--text-faint); }
.input:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 30%, transparent); }
.input[aria-invalid='true'] { border-color: var(--danger); }
.input[readonly] { color: var(--text-muted); }
.input:disabled { opacity: 0.6; }
.input--mono { font-family: var(--mono); font-size: 0.8125rem; }

/* Segmented control built from radios (native keyboard + screen-reader semantics). */
.seg {
  display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: var(--s-1);
  padding: var(--s-1); border-radius: var(--r-sm); background: var(--surface-2); border: 1px solid var(--border);
}
.seg__opt { position: relative; cursor: pointer; }
.seg__opt input { position: absolute; inset: 0; opacity: 0; cursor: pointer; margin: 0; }
.seg__opt span {
  display: block; padding: 7px 10px; border-radius: 6px; text-align: center;
  font: var(--t-label); font-weight: 600; color: var(--text-muted);
  transition: background var(--d-fast), color var(--d-fast);
}
.seg__opt input:checked + span { background: var(--surface-1); color: var(--text); box-shadow: var(--shadow-1); }
.seg__opt input:focus-visible + span { outline: 2px solid var(--brand); outline-offset: 1px; }

.check { display: inline-flex; align-items: center; gap: var(--s-2); font: var(--t-label); color: var(--text-muted); cursor: pointer; }
.check input { width: 18px; height: 18px; accent-color: var(--brand); margin: 0; }

.src-badge { display: flex; align-items: center; gap: 6px; font: var(--t-caption); color: var(--text-faint); min-height: 16px; }
.src-badge[data-kind='youtube'], .src-badge[data-kind='html5'] { color: var(--success); }
.src-badge[data-kind='invalid'] { color: var(--warning); }

.dropzone {
  position: relative; display: flex; align-items: center; gap: var(--s-3);
  min-height: 72px; padding: var(--s-3) var(--s-4);
  border-radius: var(--r-md); border: 1.5px dashed var(--border); background: var(--surface-2);
  color: var(--text-muted); cursor: pointer; transition: border-color var(--d-fast), background var(--d-fast);
}
.dropzone:hover, .dropzone.is-over { border-color: var(--brand); background: var(--brand-weak); }
.dropzone:focus-within { border-color: var(--brand); outline: 2px solid var(--brand); outline-offset: 2px; }
.dropzone input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.dropzone__icon { color: var(--brand); }
.dropzone__text { min-width: 0; overflow: hidden; text-overflow: ellipsis; }

.avatar {
  --avatar-color: var(--surface-3);
  flex: none; display: inline-grid; place-items: center;
  width: 36px; height: 36px; border-radius: var(--r-full);
  background: var(--avatar-color); color: #14141c;
  font: var(--t-caption); font-weight: 700; user-select: none;
}
.avatar--sm { width: 28px; height: 28px; font-size: 0.6875rem; }

.badge {
  display: inline-grid; place-items: center; min-width: 20px; height: 20px; padding: 0 6px;
  border-radius: var(--r-full); background: var(--brand); color: var(--brand-ink);
  font: var(--t-caption); font-weight: 700; font-variant-numeric: tabular-nums;
}
.badge--muted { background: var(--surface-3); color: var(--text-muted); }

.tag {
  display: inline-flex; align-items: center; gap: 3px; flex: none; padding: 1px 7px;
  border-radius: var(--r-full); background: var(--surface-3); color: var(--text-muted);
  font: var(--t-caption); font-size: 0.6875rem; text-transform: uppercase; letter-spacing: 0.03em;
}
.tag--host { background: var(--brand-weak); color: var(--brand); }

.live-dot {
  flex: none; width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent); animation: ping 1.8s ease-out infinite;
}

/* ---------------------------------------------------------------- 4. top bar */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: var(--s-3);
  min-height: var(--topbar-h); padding: env(safe-area-inset-top) var(--gutter) 0;
  background: var(--topbar-bg); backdrop-filter: blur(14px) saturate(150%);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex; align-items: center; gap: 10px; flex: none;
  color: var(--text); text-decoration: none; font: var(--t-h2); font-weight: 700; letter-spacing: -0.01em;
  border-radius: var(--r-sm);
}
.brand__mark {
  width: 30px; height: 30px; border-radius: 9px;
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'%3E%3Cpath d='M10 9l9 7-9 7z' fill='%23fff'/%3E%3Cpath d='M16 9l9 7-9 7z' fill='%23fff' opacity='.55'/%3E%3C/svg%3E") center / 100% no-repeat,
    var(--brand);
}
.session-pill {
  display: inline-flex; align-items: center; gap: var(--s-2); min-height: 36px; min-width: 0;
  padding: 0 var(--s-3); border-radius: var(--r-full);
  border: 1px solid var(--border); background: var(--surface-1); color: var(--text-muted);
  font: var(--t-label); cursor: pointer; transition: background var(--d-fast), border-color var(--d-fast);
}
.session-pill:hover { background: var(--surface-2); color: var(--text); }
.session-pill code { color: var(--text); }
.topbar__actions { display: flex; align-items: center; gap: var(--s-2); margin-left: auto; min-width: 0; }
.topbar__actions > * { flex: none; }

.conn {
  display: inline-flex; align-items: center; gap: var(--s-2);
  padding: 6px var(--s-3); border-radius: var(--r-full);
  font: var(--t-caption); color: var(--text-muted); white-space: nowrap;
}
.conn__dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-faint); }
.conn[data-state='good'] .conn__dot, .conn[data-state='open'] .conn__dot { background: var(--success); }
.conn[data-state='fair'] .conn__dot { background: var(--warning); }
.conn[data-state='poor'] .conn__dot { background: var(--danger); }
.conn[data-state='connecting'] .conn__dot, .conn[data-state='reconnecting'] .conn__dot { background: var(--warning); animation: pulse 1.2s ease-in-out infinite; }
.conn[data-state='offline'] .conn__dot, .conn[data-state='closed'] .conn__dot { background: var(--danger); }
/* Connected is quiet: dot only on small screens, subtle label otherwise. */
.conn[data-state='good'] .conn__text, .conn[data-state='fair'] .conn__text { color: var(--text-faint); }

.account {
  display: inline-flex; align-items: center; gap: var(--s-2); max-width: 180px; min-height: 44px;
  padding: 0 var(--s-3) 0 var(--s-1); border-radius: var(--r-full);
  border: 1px solid var(--border); background: var(--surface-1); cursor: pointer;
  transition: background var(--d-fast);
}
.account:hover { background: var(--surface-2); }
.account__label { font: var(--t-label); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------------------------------------------------------------- 5. landing */
.landing {
  width: 100%; max-width: 1100px; margin: 0 auto;
  padding: var(--s-10) var(--gutter) var(--s-8);
  display: grid; grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr); gap: var(--s-8); align-items: start;
  animation: rise var(--d-slow) var(--ease);
}
.landing__hero { display: flex; flex-direction: column; gap: var(--s-4); position: sticky; top: calc(var(--topbar-h) + var(--s-6)); }
.landing__title { font: var(--t-display); font-size: clamp(1.75rem, 4.5vw, 2.75rem); line-height: 1.1; letter-spacing: -0.025em; }
.grad { background: linear-gradient(135deg, #7c5cff, #b14bff); -webkit-background-clip: text; background-clip: text; color: transparent; }
.landing__sub { color: var(--text-muted); font-size: 1rem; line-height: 1.6; max-width: 46ch; }
.landing__name { margin-top: var(--s-2); max-width: 360px; }
.landing__cards { display: flex; flex-direction: column; gap: var(--s-4); }
#createForm { order: 1; }
#joinForm { order: 2; }
.landing--invited #joinForm { order: 0; border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 25%, transparent); }

.card {
  display: flex; flex-direction: column; gap: var(--s-4);
  padding: var(--s-5); border-radius: var(--r-md);
  background: var(--surface-1); border: 1px solid var(--border); box-shadow: var(--shadow-2);
}
.card__head { display: flex; gap: var(--s-3); align-items: flex-start; }
.card__icon {
  display: grid; place-items: center; flex: none; width: 40px; height: 40px;
  border-radius: 10px; background: var(--brand-weak); color: var(--brand);
}
.card__title { font: var(--t-h2); }
.card__sub { margin-top: 2px; font: var(--t-label); font-weight: 400; color: var(--text-muted); }

.invite-preview {
  display: flex; align-items: center; gap: var(--s-3); padding: var(--s-3) var(--s-4);
  border-radius: var(--r-sm); background: var(--surface-2); border: 1px solid var(--border);
  font: var(--t-label); font-weight: 400;
}
.invite-preview .muted { font: var(--t-caption); font-weight: 400; word-break: break-all; }
.invite-preview[data-state='missing'] { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, transparent); }

/* ---------------------------------------------------------------- 6. party */
.party {
  flex: 1; position: relative;
  display: grid; grid-template-columns: minmax(0, 1fr) var(--rail-w); gap: var(--s-4);
  padding: var(--s-4) var(--gutter);
  height: calc(100dvh - var(--topbar-h));
  animation: rise var(--d-slow) var(--ease);
}
.stage { display: flex; flex-direction: column; gap: var(--s-3); min-width: 0; min-height: 0; }

.banner {
  display: flex; align-items: center; gap: var(--s-3); padding: var(--s-2) var(--s-2) var(--s-2) var(--s-4);
  border-radius: var(--r-md); border: 1px solid color-mix(in srgb, var(--warning) 45%, transparent);
  background: color-mix(in srgb, var(--warning) 12%, var(--surface-1)); color: var(--text); font: var(--t-label);
}
.banner [data-icon] { color: var(--warning); }
.banner__text { flex: 1; }

.player {
  position: relative; flex: 1; min-height: 0;
  display: grid; place-items: center;
  border-radius: var(--r-md); background: #000; overflow: hidden; outline: none;
}
.player video, .yt-host {
  width: 100%; height: 100%; max-width: 100%; max-height: 100%;
  aspect-ratio: 16 / 9; object-fit: contain; background: #000; display: block;
}
.yt-host iframe { width: 100%; height: 100%; border: 0; display: block; }
.player:fullscreen { border-radius: 0; }

.player__spinner {
  position: absolute; width: 44px; height: 44px; border-radius: 50%; pointer-events: none; z-index: 2;
  border: 3px solid rgb(255 255 255 / 0.25); border-top-color: #fff; animation: spin 0.8s linear infinite;
}

.player__overlay {
  position: absolute; inset: 0; z-index: 3;
  display: grid; place-items: center; padding: var(--s-5);
  background: var(--overlay); backdrop-filter: blur(6px); color: var(--text);
  animation: fade var(--d-base) ease;
}
.overlay-card { max-width: 420px; display: flex; flex-direction: column; align-items: center; gap: var(--s-2); text-align: center; }
.overlay-card__icon {
  display: grid; place-items: center; width: 60px; height: 60px; margin-bottom: var(--s-1);
  border-radius: 50%; background: var(--brand-weak); color: var(--brand);
}
.overlay-card__title { font: var(--t-h1); }
.overlay-card__text { color: var(--text-muted); word-break: break-word; }
.overlay-card__actions { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--s-2); margin-top: var(--s-3); }

.unmute {
  position: absolute; top: var(--s-3); left: var(--s-3); z-index: 4;
  display: inline-flex; align-items: center; gap: var(--s-2); min-height: 40px; padding: 0 var(--s-4);
  border: 0; border-radius: var(--r-full); background: var(--brand); color: var(--brand-ink);
  font: var(--t-label); font-weight: 600; cursor: pointer; animation: rise var(--d-base) var(--ease);
}

/* Floating reactions */
.reaction-layer { position: absolute; inset: 0; z-index: 2; pointer-events: none; overflow: hidden; }
.floater {
  position: absolute; bottom: 12%;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  animation: float-up 2.6s var(--ease) forwards;
}
.floater__emoji { font-size: 40px; line-height: 1; filter: drop-shadow(0 4px 10px rgb(0 0 0 / 0.5)); }
.floater__name {
  --tint: #fff;
  padding: 1px 8px; border-radius: var(--r-full);
  background: rgb(0 0 0 / 0.65); color: var(--tint);
  font: var(--t-caption); white-space: nowrap;
}

/* SyncBar */
.syncbar {
  display: flex; align-items: center; flex-wrap: wrap; gap: var(--s-2) var(--s-3);
  padding: var(--s-2) var(--s-2) var(--s-2) var(--s-4);
  border-radius: var(--r-md); background: var(--surface-1); border: 1px solid var(--border);
}
.sync { display: inline-flex; align-items: center; gap: 10px; min-width: 0; flex: 1 1 200px; font: var(--t-label); }
.sync__text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; animation: fade var(--d-base) ease; }
.sync__dot { flex: none; width: 10px; height: 10px; border-radius: 50%; background: var(--text-faint); transition: background var(--d-base); }
.sync[data-state='playing'] .sync__dot, .sync[data-state='paused'] .sync__dot { background: var(--success); }
.sync[data-state='playing'] .sync__dot { animation: ping-green 2s ease-out infinite; }
.sync[data-state='info'] .sync__dot { background: var(--info); }
.sync[data-state='loading'] .sync__dot,
.sync[data-state='syncing'] .sync__dot,
.sync[data-state='buffering'] .sync__dot,
.sync[data-state='waiting'] .sync__dot,
.sync[data-state='offline'] .sync__dot { background: var(--warning); animation: pulse 1s ease-in-out infinite; }
.sync[data-state='drift'] .sync__dot, .sync[data-state='blocked'] .sync__dot { background: var(--warning); }
.sync[data-state='error'] .sync__dot { background: var(--danger); }
.sync[data-state='drift'], .sync[data-state='offline'] { color: var(--warning); }

.reactions { display: flex; gap: 2px; padding: 2px; border-radius: var(--r-full); background: var(--surface-2); }
.reaction {
  width: 44px; height: 44px; border: 0; border-radius: 50%; background: transparent;
  font-size: 20px; line-height: 1; cursor: pointer;
  transition: transform var(--d-fast) var(--ease), background var(--d-fast);
}
.reaction:hover { background: var(--surface-3); transform: scale(1.15); }
.reaction:active { transform: scale(0.92); }
.reactions-off { font: var(--t-caption); color: var(--text-faint); }

/* Side panel: rail (desktop) / drawer (tablet) / sheet (mobile) */
.sidebar {
  display: flex; flex-direction: column; min-height: 0; overflow: hidden;
  border-radius: var(--r-md); background: var(--surface-1); border: 1px solid var(--border); box-shadow: var(--shadow-2);
}
.sidebar__head { display: flex; align-items: center; gap: var(--s-2); padding: var(--s-2); border-bottom: 1px solid var(--border); }
.drawer-close { display: none; }
.tabs { flex: 1; display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-1); }
.tab {
  position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 44px; border: 0; border-radius: var(--r-sm); background: transparent;
  color: var(--text-muted); font: var(--t-label); font-weight: 600; cursor: pointer;
  transition: color var(--d-fast), background var(--d-fast);
}
.tab:hover { color: var(--text); background: var(--surface-2); }
.tab::after {
  content: ''; position: absolute; left: 20%; right: 20%; bottom: 2px; height: 2px; border-radius: 2px;
  background: var(--brand); transform: scaleX(0); transition: transform var(--d-base) var(--ease);
}
.tab[aria-selected='true'] { color: var(--text); }
.tab[aria-selected='true']::after { transform: scaleX(1); }

.panel { position: relative; flex: 1; min-height: 0; display: flex; flex-direction: column; overflow-y: auto; }
.panel--chat { overflow: hidden; }

/* Chat */
.chat-log {
  flex: 1; min-height: 0; margin: 0; padding: var(--s-4) var(--s-3) var(--s-1); list-style: none;
  overflow-y: auto; overscroll-behavior: contain;
  display: flex; flex-direction: column; gap: var(--s-3);
}
.chat-empty {
  margin: auto; padding: var(--s-6) 0; text-align: center; color: var(--text-faint);
  display: flex; flex-direction: column; align-items: center; gap: var(--s-2);
}
.chat-empty__emoji { font-size: 32px; opacity: 0.8; }

.msg { display: flex; gap: var(--s-2); align-items: flex-start; max-width: 100%; animation: rise var(--d-base) var(--ease); }
.msg__main { min-width: 0; display: flex; flex-direction: column; gap: 3px; max-width: calc(100% - 36px); }
.msg__meta { display: flex; align-items: baseline; gap: var(--s-2); padding: 0 4px; }
.msg__name { font: var(--t-label); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.msg time, .chat-system time { font: var(--t-caption); font-weight: 400; color: var(--text-faint); font-variant-numeric: tabular-nums; flex: none; }
.msg__bodies { display: flex; flex-direction: column; align-items: flex-start; gap: 3px; }
.msg__bubble {
  max-width: 100%; padding: 7px 12px; border-radius: 14px 14px 14px 4px;
  background: var(--surface-2); transition: opacity var(--d-base);
}
.msg__body { overflow-wrap: anywhere; white-space: pre-wrap; }
.msg__body a { color: var(--brand); text-decoration: underline; text-underline-offset: 2px; }
.msg__gif { display: block; max-width: 100%; max-height: 220px; border-radius: 10px; }
.msg__bubble:has(.msg__gif) { padding: 4px; }

.msg--mine { align-self: flex-end; justify-content: flex-end; }
.msg--mine .msg__main { max-width: 85%; align-items: flex-end; }
.msg--mine .msg__meta { justify-content: flex-end; }
.msg--mine .msg__name { color: var(--text-muted); }
.msg--mine .msg__bodies { align-items: flex-end; }
.msg--mine .msg__bubble { background: var(--brand-weak); border-radius: 14px 14px 4px 14px; }
.msg__bubble.is-pending { opacity: 0.6; }
.msg__bubble.is-failed { outline: 1px solid var(--danger); }
.msg__retry {
  display: flex; align-items: center; gap: 4px; margin-top: 4px; padding: 0;
  border: 0; background: none; color: var(--danger); font: var(--t-caption); cursor: pointer;
}
.msg__retry:hover { text-decoration: underline; }

.chat-system {
  display: flex; justify-content: center; align-items: baseline; flex-wrap: wrap; gap: 6px;
  font: var(--t-caption); font-weight: 400; color: var(--text-faint); text-align: center;
}
.chat-system strong { color: var(--text-muted); font-weight: 600; }

.new-msgs {
  position: absolute; left: 50%; bottom: 92px; z-index: 2; transform: translateX(-50%);
  display: inline-flex; align-items: center; gap: 6px; min-height: 36px; padding: 0 var(--s-4);
  border: 0; border-radius: var(--r-full); background: var(--brand); color: var(--brand-ink);
  font: var(--t-caption); font-weight: 600; cursor: pointer; box-shadow: 0 8px 20px -6px rgb(0 0 0 / 0.5);
}

.typing { display: flex; align-items: center; gap: 6px; min-height: 22px; padding: 0 var(--s-4); font: var(--t-caption); font-weight: 400; color: var(--text-faint); }
.typing__dots { display: inline-flex; gap: 3px; }
.typing__dots i { width: 5px; height: 5px; border-radius: 50%; background: currentColor; animation: bounce 1.2s infinite ease-in-out; }
.typing__dots i:nth-child(2) { animation-delay: 0.15s; }
.typing__dots i:nth-child(3) { animation-delay: 0.3s; }

.composer {
  display: flex; align-items: flex-end; gap: var(--s-2);
  padding: var(--s-2) var(--s-3) max(var(--s-3), env(safe-area-inset-bottom));
}
.composer__input { resize: none; line-height: 1.375rem; overflow-y: auto; }

/* People */
.people { list-style: none; margin: 0; padding: var(--s-2); }
.person { display: flex; align-items: center; gap: var(--s-3); padding: 10px; border-radius: var(--r-sm); }
.person:hover { background: var(--surface-2); }
.person__main { min-width: 0; flex: 1; }
.person__name { display: flex; align-items: center; gap: 6px; font: var(--t-label); font-weight: 600; }
.person__label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.person__status { display: flex; align-items: center; gap: 6px; font: var(--t-caption); font-weight: 400; color: var(--text-faint); }
.person__dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); }
.person[data-state='buffering'] .person__dot { background: var(--warning); animation: pulse 1s ease-in-out infinite; }
.person[data-state='typing'] .person__dot { background: var(--info); }
.people-empty {
  display: flex; flex-direction: column; align-items: center; gap: var(--s-3);
  margin-top: var(--s-4); padding: var(--s-5) var(--s-4);
  border: 1px dashed var(--border); border-radius: var(--r-md);
  text-align: center; color: var(--text-muted); font: var(--t-label); font-weight: 400;
}

/* Floating chat button (tablet drawer mode only) */
.chat-fab {
  display: none;
  position: fixed; right: var(--s-5); bottom: max(var(--s-5), env(safe-area-inset-bottom)); z-index: 15;
  width: 56px; height: 56px; border: 0; border-radius: 50%;
  background: var(--brand); color: var(--brand-ink); cursor: pointer;
  place-items: center; box-shadow: 0 12px 28px -8px rgb(0 0 0 / 0.55);
  transition: transform var(--d-fast) var(--ease), background var(--d-fast);
}
.chat-fab:hover { background: var(--brand-hover); transform: scale(1.05); }
.chat-fab .badge { position: absolute; top: -2px; right: -2px; background: var(--danger); color: #fff; }

/* Share sheet */
.invite__row { display: flex; gap: var(--s-2); }
.invite__meta {
  display: grid; gap: var(--s-3); padding: var(--s-4);
  border-radius: var(--r-sm); background: var(--surface-2); border: 1px solid var(--border);
}
.invite__meta dt { font: var(--t-caption); color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.04em; }
.invite__meta dd { margin-top: 2px; overflow-wrap: anywhere; }
.invite__meta code { font-size: 0.9375rem; color: var(--brand); }

/* ---------------------------------------------------------------- 7. ended */
.ended { flex: 1; display: grid; place-items: center; padding: var(--s-8) var(--gutter); animation: rise var(--d-slow) var(--ease); }
.ended__card { max-width: 440px; align-items: center; text-align: center; padding: var(--s-6) var(--s-5); }
.ended__icon { display: grid; place-items: center; width: 64px; height: 64px; border-radius: 50%; background: var(--brand-weak); color: var(--brand); }
.ended__title { font: var(--t-h1); }
.ended__text { color: var(--text-muted); }
.ended__actions { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--s-2); margin-top: var(--s-2); }

/* ---------------------------------------------------------------- 8. modals & toasts */
.modal { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; padding: var(--s-4); }
.modal__backdrop { position: absolute; inset: 0; background: var(--scrim); backdrop-filter: blur(4px); animation: fade var(--d-fast) ease; }
.modal__panel {
  position: relative; width: 100%; max-width: 420px; max-height: calc(100dvh - 32px); overflow-y: auto;
  display: flex; flex-direction: column; gap: var(--s-4); padding: var(--s-5);
  border-radius: var(--r-lg); background: var(--surface-1); border: 1px solid var(--border);
  box-shadow: 0 30px 70px -20px rgb(0 0 0 / 0.6); animation: pop var(--d-base) var(--ease);
}
.modal__head { display: flex; align-items: center; justify-content: space-between; margin: -8px -10px -6px 0; }
.modal__title { font: var(--t-h2); font-size: 1.1875rem; }
.modal__text { color: var(--text-muted); }

.shortcuts summary { display: flex; align-items: center; gap: var(--s-2); cursor: pointer; font: var(--t-label); color: var(--text-muted); border-radius: var(--r-sm); }
.shortcuts dl { display: grid; gap: var(--s-2); margin-top: var(--s-3); }
.shortcuts dl div { display: flex; justify-content: space-between; gap: var(--s-3); font: var(--t-label); font-weight: 400; }
.shortcuts dd { color: var(--text-muted); }
kbd { display: inline-block; min-width: 24px; padding: 1px 6px; border-radius: 5px; border: 1px solid var(--border); border-bottom-width: 2px; background: var(--surface-2); font-size: 0.75rem; text-align: center; }

.toasts {
  position: fixed; right: var(--s-4); bottom: max(var(--s-4), env(safe-area-inset-bottom)); z-index: 60;
  display: flex; flex-direction: column; gap: var(--s-2); width: min(380px, calc(100vw - 32px)); pointer-events: none;
}
/* In a party, keep toasts clear of the chat composer in the bottom-right rail. */
body[data-view='party'] .toasts { bottom: max(88px, env(safe-area-inset-bottom)); }
.toast {
  pointer-events: auto; display: flex; align-items: center; gap: 10px; padding: var(--s-3) 10px var(--s-3) 14px;
  border-radius: var(--r-md); background: var(--surface-1); border: 1px solid var(--border);
  box-shadow: 0 16px 40px -12px rgb(0 0 0 / 0.5); font: var(--t-label); font-weight: 400;
  animation: toast-in var(--d-base) var(--ease);
}
.toast.is-leaving { animation: toast-out var(--d-base) ease forwards; }
.toast__text { flex: 1; }
.toast--success .icon { color: var(--success); }
.toast--error .icon { color: var(--danger); }
.toast--warn .icon { color: var(--warning); }
.toast--info .icon { color: var(--info); }
.toast--error { border-color: color-mix(in srgb, var(--danger) 45%, transparent); }
.toast__close {
  display: grid; place-items: center; width: 32px; height: 32px; flex: none;
  border: 0; border-radius: 6px; background: transparent; color: var(--text-faint); cursor: pointer;
}
.toast__close:hover { background: var(--surface-2); color: var(--text); }

/* ---------------------------------------------------------------- 9. motion */
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 50% { opacity: 0.35; } }
@keyframes fade { from { opacity: 0; } }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } }
@keyframes pop { from { opacity: 0; transform: translateY(10px) scale(0.97); } }
@keyframes toast-in { from { opacity: 0; transform: translateY(12px); } }
@keyframes toast-out { to { opacity: 0; transform: translateY(8px); } }
@keyframes bounce { 0%, 80%, 100% { transform: translateY(0); opacity: 0.5; } 40% { transform: translateY(-4px); opacity: 1; } }
@keyframes ping {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 60%, transparent); }
  80%, 100% { box-shadow: 0 0 0 7px transparent; }
}
@keyframes ping-green {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--success) 55%, transparent); }
  80%, 100% { box-shadow: 0 0 0 6px transparent; }
}
@keyframes float-up {
  0% { opacity: 0; transform: translate(0, 20px) scale(0.6); }
  12% { opacity: 1; transform: translate(0, 0) scale(1.1); }
  100% { opacity: 0; transform: translate(var(--drift, 0), -220px) scale(1); }
}
@keyframes fade-in-place { 0% { opacity: 0; } 20% { opacity: 1; } 100% { opacity: 0; } }

/* Reduced motion: no transforms/float/scale; opacity fades only. */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .btn:hover, .reaction:hover, .chat-fab:hover { transform: none; }
  .floater { animation: fade-in-place 1.8s ease forwards !important; }
  .live-dot, .sync__dot, .conn__dot, .typing__dots i { animation: none !important; }
}

/* ---------------------------------------------------------------- 10. breakpoints */
/* Tablet 768–1119: player full width; panel becomes an overlay drawer opened by the FAB. */
@media (max-width: 1119.98px) {
  .party { grid-template-columns: minmax(0, 1fr); }
  .landing { grid-template-columns: 1fr; gap: var(--s-6); padding-top: var(--s-8); }
  .landing__hero { position: static; }
}

@media (min-width: 768px) and (max-width: 1119.98px) {
  .sidebar {
    position: fixed; top: calc(var(--topbar-h) + var(--s-3)); right: var(--s-3); bottom: var(--s-3); z-index: 30;
    width: min(var(--rail-w), calc(100vw - 2 * var(--s-3)));
    transform: translateX(calc(100% + var(--s-4))); visibility: hidden;
    transition: transform var(--d-slow) var(--ease), visibility 0s linear var(--d-slow);
    box-shadow: 0 30px 80px -20px rgb(0 0 0 / 0.6);
  }
  .party[data-drawer='open'] .sidebar { transform: none; visibility: visible; transition: transform var(--d-slow) var(--ease); }
  .drawer-close { display: inline-flex; }
  .chat-fab { display: grid; }
  .syncbar { margin-right: 76px; } /* keep the reaction dock clear of the FAB */
  .party[data-drawer='open'] .chat-fab { display: none; }
}

/* Mobile < 768: single column; player pinned on top, chat/people sheet fills the rest. */
@media (max-width: 767.98px) {
  :root { --topbar-h: 56px; }
  .brand__name, .conn__text, .account__label, .session-pill__label, #leaveBtn .btn__label { display: none; }
  .account { padding: 0 var(--s-1); }
  body[data-view='party'] .account { display: none; } /* account isn't needed mid-party; frees the bar */
  #leaveBtn { width: 44px; padding: 0; }
  .topbar { gap: var(--s-2); }
  .topbar__actions { gap: var(--s-1); }

  .landing { padding-top: var(--s-6); }
  .card { padding: var(--s-4); }

  .party {
    display: flex; flex-direction: column; gap: 0; padding: 0;
    height: calc(100dvh - var(--topbar-h));
  }
  .stage { flex: none; gap: 0; position: sticky; top: var(--topbar-h); z-index: 5; background: var(--bg); }
  .banner { border-radius: 0; border-left: 0; border-right: 0; }
  .player { flex: none; border-radius: 0; aspect-ratio: 16 / 9; }
  .syncbar { border-radius: 0; border-left: 0; border-right: 0; border-top: 0; padding: 6px var(--s-2) 6px var(--s-4); }
  .reactions { order: 3; width: 100%; justify-content: space-between; background: transparent; }
  .sidebar { flex: 1; border-radius: 0; border: 0; box-shadow: none; }
  .toasts { left: 50%; right: auto; transform: translateX(-50%); bottom: max(76px, env(safe-area-inset-bottom)); }
  .floater__emoji { font-size: 32px; }
}