*,
*::before,
*::after { box-sizing: border-box; }

:root {
  color-scheme: light;

  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 22px;

  --ease-spring: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);

  --bg: #f5f5f7;
  --surface: #ffffff;
  --surface-2: #f2f2f4;
  --surface-sunken: #ebebef;
  --text: #1d1d1f;
  --text-secondary: #515154;
  --text-tertiary: #86868b;
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.14);
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --accent-pressed: #006edb;
  --accent-on: #ffffff;
  --accent-faint: rgba(0, 113, 227, 0.10);
  --success: #248a3d;
  --success-faint: rgba(36, 138, 61, 0.12);
  --success-glow: rgba(36, 138, 61, 0.28);
  --danger: #d70015;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.10);
}

[data-theme="dark"] {
  color-scheme: dark;

  --bg: #000000;
  --surface: #1c1c1e;
  --surface-2: #2c2c2e;
  --surface-3: #3a3a3c;
  --surface-sunken: #0d0d0f;
  --text: #f5f5f7;
  --text-secondary: #c7c7cc;
  --text-tertiary: #8e8e93;
  --border: rgba(255, 255, 255, 0.12);
  --border-strong: rgba(255, 255, 255, 0.22);
  --accent: #0a84ff;
  --accent-hover: #409cff;
  --accent-pressed: #0971e0;
  --accent-on: #ffffff;
  --accent-faint: rgba(10, 132, 255, 0.22);
  --success: #30d158;
  --success-faint: rgba(48, 209, 88, 0.22);
  --success-glow: rgba(48, 209, 88, 0.40);
  --danger: #ff453a;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] .vote-card-front {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-strong);
}
[data-theme="dark"] .card-btn:hover:not(:disabled) {
  background: var(--surface-3);
}

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Segoe UI", Roboto, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s var(--ease-standard), color 0.3s var(--ease-standard);
}

h1, h2 {
  margin: 0 0 var(--s-2);
  font-weight: 600;
  letter-spacing: -0.022em;
}
h1 { font-size: 1.6rem; letter-spacing: -0.028em; }
h2 {
  font-size: 0.82rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  margin-bottom: var(--s-4);
}

p { margin: 0 0 var(--s-3); line-height: 1.5; color: var(--text-secondary); }
.muted { color: var(--text-tertiary); font-size: 0.9rem; }
.error { color: var(--danger); }
.hidden { display: none !important; }

.centered {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--s-5);
}

.card {
  background: var(--surface);
  padding: var(--s-6);
  border-radius: var(--r-xl);
  max-width: 460px;
  width: 100%;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

label {
  display: block;
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: var(--s-4);
  font-weight: 500;
}

input[type="text"] {
  display: block;
  width: 100%;
  margin-top: var(--s-2);
  padding: 0.7rem 0.85rem;
  border-radius: var(--r-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface-sunken);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.15s var(--ease-standard), box-shadow 0.15s var(--ease-standard), background 0.15s var(--ease-standard);
}
input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-faint);
  background: var(--surface);
}

button {
  cursor: pointer;
  border: none;
  border-radius: 980px;
  padding: 0.6rem 1.1rem;
  font-size: 0.95rem;
  background: var(--accent);
  color: var(--accent-on);
  font-weight: 500;
  font-family: inherit;
  letter-spacing: -0.01em;
  transition: background 0.15s var(--ease-standard), transform 0.15s var(--ease-spring), opacity 0.15s var(--ease-standard);
}
button:hover:not(:disabled) { background: var(--accent-hover); }
button:active:not(:disabled) { background: var(--accent-pressed); transform: scale(0.97); }
button:disabled { opacity: 0.4; cursor: not-allowed; }

button.secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}
button.secondary:hover:not(:disabled) { background: var(--surface-sunken); }

.link-btn {
  background: transparent;
  color: var(--accent);
  padding: 0.4rem 0;
  font-size: 0.88rem;
  border-radius: 0;
  font-weight: 500;
}
.link-btn:hover:not(:disabled) { background: transparent; opacity: 0.75; }

/* Theme toggle */
.theme-toggle {
  position: fixed;
  top: var(--s-4);
  right: var(--s-4);
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: 50%;
  background: var(--surface);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-sm);
  z-index: 100;
}
.theme-toggle:hover:not(:disabled) {
  background: var(--surface-2);
  color: var(--text);
}
.theme-toggle svg { width: 16px; height: 16px; display: block; }
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* Room layout */
.room {
  max-width: 880px;
  margin: 0 auto;
  padding: var(--s-5);
}

.room-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--s-4);
  padding-bottom: var(--s-4);
  padding-right: 52px;
  margin-bottom: var(--s-4);
  flex-wrap: wrap;
}
.room-header h1 { margin-bottom: var(--s-1); }
.room-header .muted { font-size: 0.88rem; }

.invite-bar {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: var(--s-2) var(--s-3);
  margin-bottom: var(--s-4);
  box-shadow: var(--shadow-sm);
}
.invite-label {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  padding: 0 var(--s-1);
}
.invite-bar input {
  flex: 1;
  min-width: 0;
  margin: 0;
  padding: 0.4rem 0.55rem;
  font-size: 0.85rem;
  background: var(--surface-sunken);
  color: var(--text-secondary);
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.invite-bar input:focus { background: var(--surface-sunken); }
.invite-bar button {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
}

/* Sections */
.table-section,
.deck-section {
  background: var(--surface);
  padding: var(--s-6) var(--s-5);
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  margin-bottom: var(--s-4);
}

/* Table layout */
.table-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--s-4);
}

.seats {
  display: flex;
  gap: var(--s-5);
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-end;
  width: 100%;
  min-height: 100px;
}
.seats-bottom { align-items: flex-start; }

.seat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--s-2);
  min-width: 68px;
  max-width: 120px;
  transition: opacity 0.3s var(--ease-standard);
}
.seats-bottom .seat { flex-direction: column-reverse; }
.seat.offline { opacity: 0.5; }

.seat-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 120px;
}
.seat.me .seat-name { color: var(--accent); }
.seat.offline .seat-name::after {
  content: ' · reconnecting';
  color: var(--text-tertiary);
  font-weight: 400;
  font-size: 0.78rem;
}
.seat-admin {
  display: inline-block;
  font-size: 0.7rem;
  color: var(--text-tertiary);
  font-weight: 500;
  margin-left: var(--s-1);
}

/* Table centerpiece */
.table {
  background: var(--accent-faint);
  border-radius: 60px;
  width: min(100%, 520px);
  min-height: 110px;
  display: grid;
  place-items: center;
  padding: var(--s-5) var(--s-6);
  transition: background 0.3s var(--ease-standard);
}
.table.revealed { background: var(--success-faint); }

.table-action {
  font-size: 0.95rem;
  padding: 0.65rem 1.4rem;
  background: var(--text);
  color: var(--bg);
}
.table-action:hover:not(:disabled) { background: var(--text); opacity: 0.85; }
.table-action:active:not(:disabled) { background: var(--text); }

.table-status {
  margin: 0;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
}

/* Flip card for participant vote */
.vote-card {
  position: relative;
  width: 52px;
  height: 74px;
  flex-shrink: 0;
  perspective: 800px;
}
.vote-card-inner {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  transition: transform 0.75s var(--ease-spring);
  transition-delay: var(--flip-delay, 0ms);
}
.vote-card.revealed .vote-card-inner {
  transform: rotateY(180deg);
}
.vote-card-face {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  border-radius: var(--r-md);
  font-weight: 600;
  font-size: 1.1rem;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
.vote-card-front {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-tertiary);
}
.vote-card-front.voted {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-on);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.10);
}
.vote-card-back {
  transform: rotateY(180deg);
  background: var(--surface);
  color: var(--accent);
  border: 1.5px solid var(--accent);
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
}
.vote-card-back.no-vote {
  background: var(--surface-2);
  color: var(--text-tertiary);
  border: 1px dashed var(--border-strong);
  box-shadow: none;
}
.vote-card.consensus .vote-card-back:not(.no-vote) {
  border-color: var(--success);
  color: var(--success);
  box-shadow: 0 0 0 3px var(--success-glow);
}

/* Result panel */
.result-panel {
  margin-top: var(--s-5);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--s-6);
  align-items: end;
  padding-top: var(--s-5);
  border-top: 1px solid var(--border);
}

.distribution {
  display: flex;
  gap: var(--s-4);
  align-items: flex-end;
  justify-content: flex-start;
  flex-wrap: wrap;
}
.distribution-empty {
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

.dist-bar {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--s-2);
  min-width: 48px;
}
.dist-fill-wrap {
  height: 80px;
  display: flex;
  align-items: flex-end;
}
.dist-fill {
  width: 8px;
  border-radius: 4px;
  background: var(--text-tertiary);
  min-height: 8px;
  transition: height 0.4s var(--ease-spring);
}
.dist-bar.top .dist-fill { background: var(--text); }
.dist-value {
  display: grid;
  place-items: center;
  min-width: 42px;
  height: 42px;
  padding: 0 10px;
  border: 1px solid var(--border-strong);
  border-radius: var(--r-sm);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-secondary);
  background: var(--surface);
}
.dist-bar.top .dist-value {
  border-color: var(--text);
  color: var(--text);
}
.dist-count {
  font-size: 0.78rem;
  color: var(--text-tertiary);
}
.dist-bar.top .dist-count { color: var(--text); font-weight: 600; }

.result-summary {
  display: flex;
  flex-direction: column;
  gap: var(--s-4);
  text-align: right;
  justify-self: end;
}
.result-metric-label {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 2px;
}
.result-metric-value {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}
.result-agreement {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.3rem 0.75rem;
  border-radius: 980px;
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--surface-2);
  color: var(--text-secondary);
  letter-spacing: 0.01em;
}
.result-agreement.consensus {
  background: var(--success-faint);
  color: var(--success);
}

/* Voting deck */
.deck {
  display: flex;
  gap: var(--s-3);
  flex-wrap: wrap;
}

.card-btn {
  min-width: 3.75rem;
  height: 5.25rem;
  padding: 0;
  border-radius: var(--r-md);
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border-strong);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: transform 0.2s var(--ease-spring), border-color 0.15s var(--ease-standard), background 0.15s var(--ease-standard), box-shadow 0.2s var(--ease-standard);
}
.card-btn:hover:not(:disabled) {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  background: var(--surface);
}
.card-btn:active:not(:disabled) { transform: translateY(-1px) scale(0.98); }
.card-btn.selected {
  background: var(--accent);
  color: var(--accent-on);
  border-color: var(--accent);
  box-shadow: 0 6px 16px var(--accent-faint);
}
.card-btn:disabled { opacity: 0.45; cursor: not-allowed; }

.deck-footer {
  margin-top: var(--s-3);
  min-height: 1.5rem;
}

@media (max-width: 640px) {
  .room { padding: var(--s-4); }
  .table-section,
  .deck-section { padding: var(--s-4); }
  .table { border-radius: 32px; padding: var(--s-4); min-height: 88px; }
  .table-action { padding: 0.55rem 1.1rem; font-size: 0.9rem; }
  .seats { gap: var(--s-3); min-height: 80px; }
  .seat { min-width: 56px; }
  .vote-card { width: 44px; height: 62px; }
  .result-panel {
    grid-template-columns: 1fr;
    gap: var(--s-4);
    padding-top: var(--s-4);
  }
  .distribution { justify-content: center; }
  .result-summary { flex-direction: row; justify-self: center; align-items: center; gap: var(--s-5); text-align: left; }
  .card-btn { min-width: 3rem; height: 4.5rem; font-size: 1.05rem; }
}