/* =========================
   中發白 PWA 樣式
   ========================= */

:root {
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-zhong: #c0392b;   /* 中 - 紅 */
  --color-fa: #16a34a;      /* 發 - 綠 */
  --color-bai: #f3f4f6;     /* 白 - 淺灰白 */
  --color-bg: #ffffff;
  --color-surface: #f9fafb;
  --color-border: #e5e7eb;
  --color-text: #111827;
  --color-muted: #6b7280;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-border: #334155;
    --color-text: #f1f5f9;
    --color-muted: #94a3b8;
  }
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC",
    "Microsoft JhengHei", "Noto Sans TC", Roboto, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* ===== Header ===== */
.app-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 2px;
}

/* 麻將牌風格的中發白 */
.tile {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 44px;
  border: 2px solid #d1d5db;
  border-radius: 6px;
  background: #fafafa;
  color: #111;
  font-size: 1.1rem;
  font-weight: 800;
  box-shadow: inset 0 -3px 0 rgba(0,0,0,0.08);
}
.tile-zhong { color: var(--color-zhong); }
.tile-fa    { color: var(--color-fa); }
.tile-bai   { color: #94a3b8; background: #fff; }

/* ===== Main ===== */
.app-main {
  padding: 2rem 1rem 4rem;
}

.hero {
  margin-bottom: 2rem;
}

.hero h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
}

/* ===== Cards ===== */
.card-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
}

.card p {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0.55rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  font-family: inherit;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-primary-dark);
}

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
}
.btn-ghost:hover {
  border-color: var(--color-primary);
}

/* ===== Misc ===== */
.muted { color: var(--color-muted); }
.small { font-size: 0.85rem; }

.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: var(--color-border);
  color: var(--color-text);
  font-size: 0.8rem;
  font-weight: 600;
}
.badge.online   { background: #dcfce7; color: #166534; }
.badge.offline  { background: #fee2e2; color: #991b1b; }

/* ===== Footer ===== */
.app-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 0;
  margin-top: 2rem;
}

/* ===== Safe area (iOS notch) ===== */
@supports (padding: max(0px)) {
  .app-header { padding-top: env(safe-area-inset-top); }
  .app-footer { padding-bottom: max(1.5rem, env(safe-area-inset-bottom)); }
}