/* ==========================================================================
   Mahjong Web App — Shared Styles
   Dark theme, responsive, mobile-first
   ========================================================================== */

:root {
  --bg-primary: #0f1923;
  --bg-card: #1a2634;
  --bg-card-hover: #1f2f40;
  --bg-input: #0d1520;
  --border-color: #2a3a4a;
  --border-focus: #4a8bb5;
  --text-primary: #e8edf2;
  --text-secondary: #8a9bb0;
  --text-muted: #5a6b7a;
  --accent: #e9c46a;
  --accent-dim: #b89a3a;
  --success: #4caf50;
  --danger: #e63946;
  --info: #457b9d;

  --suit-m: #e63946;
  --suit-p: #457b9d;
  --suit-s: #2d9a5f;
  --suit-z: #9a8ac0;

  --tile-bg: #f5f0e8;
  --tile-border: #d4c8b0;
  --tile-shadow: rgba(0,0,0,0.3);

  --radius: 8px;
  --radius-sm: 4px;
  --radius-lg: 12px;
  --gap: 12px;
  --gap-sm: 6px;
  --gap-lg: 20px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 15px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
  overflow-x: hidden;
}

/* ---------- Layout ---------- */

.app-container {
  max-width: 680px;
  margin: 0 auto;
  padding: 12px;
}

.app-header {
  text-align: center;
  padding: 16px 0 8px;
}

.app-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 2px;
}

.app-header .subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.nav-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 8px;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.8rem;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  transition: all 0.2s;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--accent);
  border-color: var(--accent-dim);
  background: rgba(233, 196, 106, 0.08);
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px;
  margin-bottom: var(--gap);
}

.card-title {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
  font-weight: 600;
}

/* ---------- Inputs ---------- */

input[type="text"], input[type="number"], select {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  padding: 10px 14px;
  font-size: 1rem;
  font-family: 'SF Mono', 'Menlo', monospace;
  width: 100%;
  transition: border-color 0.2s;
  outline: none;
}

input:focus, select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 2px rgba(74, 139, 181, 0.2);
}

input::placeholder {
  color: var(--text-muted);
  font-family: inherit;
}

label {
  display: block;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
  font-weight: 500;
}

.input-row {
  display: flex;
  gap: var(--gap-sm);
  align-items: end;
}

.input-row > * {
  flex: 1;
}

.input-group {
  margin-bottom: var(--gap);
}

.count-badge {
  display: inline-block;
  font-size: 0.8rem;
  padding: 2px 10px;
  border-radius: 12px;
  font-weight: 600;
  margin-left: 8px;
  vertical-align: middle;
}

.count-badge.valid {
  background: rgba(76, 175, 80, 0.15);
  color: var(--success);
}

.count-badge.invalid {
  background: rgba(230, 57, 70, 0.15);
  color: var(--danger);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}

.btn:hover { background: var(--bg-card-hover); }
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--accent);
  color: #1a1a2e;
  border-color: var(--accent);
  font-weight: 600;
}

.btn-primary:hover { background: var(--accent-dim); }

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

.btn-danger { color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: rgba(230, 57, 70, 0.1); }

.btn-group {
  display: flex;
  gap: var(--gap-sm);
  flex-wrap: wrap;
}

/* ---------- Tile Grid ---------- */

.tile-grid {
  user-select: none;
  -webkit-user-select: none;
}

.tile-row {
  display: flex;
  align-items: center;
  gap: 3px;
  margin-bottom: 4px;
}

.tile-row-label {
  width: 26px;
  text-align: center;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}

.tile-display {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 48px;
  border-radius: 5px;
  border: 1.5px solid var(--tile-border);
  background: var(--tile-bg);
  font-size: 0.72rem;
  line-height: 1.1;
  position: relative;
  font-weight: 700;
  box-shadow: 0 2px 4px var(--tile-shadow);
  transition: transform 0.12s, box-shadow 0.12s;
}

.tile-display.tile-btn {
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.tile-display.tile-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px var(--tile-shadow);
}

.tile-display.tile-btn:active {
  transform: translateY(1px) scale(0.95);
  box-shadow: 0 1px 2px var(--tile-shadow);
}

.tile-rank { font-size: 0.9rem; }
.tile-suit { font-size: 0.65rem; opacity: 0.7; }
.tile-honor { font-size: 1.05rem; }

.tile-badge {
  position: absolute;
  top: -6px;
  right: -6px;
  background: var(--accent);
  color: #1a1a2e;
  font-size: 0.6rem;
  font-weight: 700;
  padding: 1px 4px;
  border-radius: 8px;
  line-height: 1.2;
}

/* ---------- Hand Display ---------- */

.hand-display {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  min-height: 52px;
  padding: 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  align-items: center;
}

.hand-display .tile-display.hand-tile {
  width: 34px;
  height: 44px;
  font-size: 0.68rem;
  cursor: pointer;
}

.hand-display .tile-display.hand-tile:hover {
  opacity: 0.6;
  transform: translateY(-2px);
}

.hand-display .tile-display.hand-tile .tile-rank { font-size: 0.85rem; }

.hand-placeholder {
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 4px;
}

/* ---------- Mode Tabs ---------- */

.mode-tabs {
  display: flex;
  gap: 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: var(--gap);
}

.mode-tab {
  flex: 1;
  padding: 10px;
  text-align: center;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--bg-card);
  color: var(--text-secondary);
  border: none;
  transition: all 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.mode-tab:not(:last-child) {
  border-right: 1px solid var(--border-color);
}

.mode-tab.active {
  background: var(--accent);
  color: #1a1a2e;
}

.mode-tab:hover:not(.active) {
  background: var(--bg-card-hover);
}

/* ---------- Toggle / Radio ---------- */

.toggle-group {
  display: flex;
  gap: var(--gap);
  flex-wrap: wrap;
}

.toggle-item {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  -webkit-tap-highlight-color: transparent;
}

.toggle-item input[type="radio"],
.toggle-item input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
}

/* ---------- Results ---------- */

.results-section {
  min-height: 60px;
}

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--gap);
}

.shanten-display {
  font-size: 1.2rem;
  font-weight: 700;
}

.shanten-0 { color: var(--success); }
.shanten-neg { color: var(--accent); }

.result-empty {
  text-align: center;
  color: var(--text-muted);
  padding: 30px 0;
  font-size: 0.9rem;
}

/* ---------- Discard Table ---------- */

.discard-list {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.discard-item {
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 10px 12px;
  transition: background 0.2s;
}

.discard-item:first-child {
  border-color: var(--accent-dim);
  background: rgba(233, 196, 106, 0.05);
}

.discard-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.discard-stars {
  color: var(--accent);
  font-size: 0.9rem;
  min-width: 42px;
}

.discard-tile-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.discard-stats {
  display: flex;
  gap: var(--gap);
  font-size: 0.8rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.discard-stats .stat-label { color: var(--text-muted); }
.discard-stats .stat-value { font-weight: 600; color: var(--text-primary); }

.discard-acceptance {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  margin-top: 6px;
}

.discard-acceptance .tile-display {
  width: 30px;
  height: 38px;
  font-size: 0.6rem;
}

.discard-acceptance .tile-display .tile-rank { font-size: 0.75rem; }
.discard-acceptance .tile-display .tile-suit { font-size: 0.55rem; }
.discard-acceptance .tile-display .tile-honor { font-size: 0.85rem; }

/* ---------- Fan Table ---------- */

.fan-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.fan-table th {
  text-align: left;
  padding: 6px 8px;
  border-bottom: 2px solid var(--border-color);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.8rem;
}

.fan-table td {
  padding: 5px 8px;
  border-bottom: 1px solid var(--border-color);
}

.fan-table tr:last-child td {
  border-bottom: none;
}

.fan-table .fan-total {
  font-weight: 700;
  border-top: 2px solid var(--accent-dim);
  color: var(--accent);
}

.fan-valid { color: var(--success); font-weight: 600; }
.fan-invalid { color: var(--danger); font-weight: 600; }

/* ---------- Acceptance Display ---------- */

.acceptance-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.acceptance-tile {
  position: relative;
}

.acceptance-tile .tile-display {
  width: 36px;
  height: 46px;
}

.win-badge {
  position: absolute;
  bottom: -4px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.55rem;
  font-weight: 700;
  padding: 1px 4px;
  border-radius: 6px;
  white-space: nowrap;
}

.win-badge.valid {
  background: rgba(76, 175, 80, 0.2);
  color: var(--success);
}

.win-badge.invalid {
  background: rgba(230, 57, 70, 0.2);
  color: var(--danger);
}

/* ---------- Wait Tiles ---------- */

.wait-list {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
}

.wait-item {
  display: flex;
  align-items: center;
  gap: var(--gap);
  padding: 8px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}

.wait-item.valid { border-color: var(--success); }
.wait-item.invalid { border-color: var(--danger); opacity: 0.7; }

.wait-info {
  flex: 1;
  font-size: 0.85rem;
}

.wait-info .tile-name { font-weight: 600; }

/* ---------- Riichi Panel ---------- */

.riichi-panel {
  display: none;
}

.riichi-panel.visible {
  display: block;
}

.score-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap-sm);
}

/* ---------- Strategy ---------- */

.strategy-section {
  border-top: 1px solid var(--border-color);
  padding-top: var(--gap);
  margin-top: var(--gap);
}

.strategy-suggestion {
  padding: 6px 0;
  font-size: 0.88rem;
  line-height: 1.4;
}

.yaku-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 6px;
}

.yaku-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 0.78rem;
  font-weight: 600;
}

.yaku-tag.confirmed {
  background: rgba(76, 175, 80, 0.15);
  color: var(--success);
}

.yaku-tag.likely {
  background: rgba(233, 196, 106, 0.15);
  color: var(--accent);
}

.yaku-tag.possible {
  background: rgba(138, 155, 176, 0.15);
  color: var(--text-secondary);
}

/* ---------- Meld Display ---------- */

.meld-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
  margin-top: 6px;
}

.meld-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
}

.meld-tag .remove-meld {
  cursor: pointer;
  color: var(--danger);
  font-weight: 700;
  margin-left: 4px;
}

/* ---------- Collapsible ---------- */

.collapsible-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: 4px 0;
  -webkit-tap-highlight-color: transparent;
}

.collapsible-header::after {
  content: '▾';
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: transform 0.2s;
}

.collapsible-header.collapsed::after {
  transform: rotate(-90deg);
}

.collapsible-content {
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.collapsible-content.collapsed {
  max-height: 0 !important;
  padding: 0;
}

/* ---------- Animations ---------- */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-in {
  animation: fadeIn 0.2s ease;
}

/* ---------- Responsive ---------- */

@media (max-width: 480px) {
  html { font-size: 14px; }

  .app-container { padding: 8px; }

  .tile-display {
    width: 34px;
    height: 44px;
    font-size: 0.68rem;
  }

  .tile-display .tile-rank { font-size: 0.82rem; }
  .tile-display .tile-honor { font-size: 0.95rem; }

  .tile-row { gap: 2px; }
  .tile-row-label { width: 22px; font-size: 0.72rem; }

  .hand-display .tile-display.hand-tile {
    width: 30px;
    height: 40px;
    font-size: 0.62rem;
  }

  .card { padding: 12px; }

  .score-grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 700px) {
  .app-container { padding: 20px; }

  .tile-display {
    width: 42px;
    height: 54px;
    font-size: 0.78rem;
  }

  .tile-display .tile-rank { font-size: 1rem; }
  .tile-display .tile-honor { font-size: 1.15rem; }
}

/* ---------- Scrollbar ---------- */

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

/* ---------- Loading ---------- */

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 20px;
  color: var(--text-muted);
}

.loading-spinner {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-color);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------- Utility ---------- */

.hidden { display: none !important; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-accent { color: var(--accent); }
.mt-sm { margin-top: var(--gap-sm); }
.mt { margin-top: var(--gap); }
.mb { margin-bottom: var(--gap); }
.fw-bold { font-weight: 700; }
.fs-sm { font-size: 0.82rem; }