/* ============================================
   Homepage — Deck & Hero
   ============================================ */

.home-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 80px 24px;
  position: relative;
  overflow: hidden;
}

/* --- Background: interlacing horizontal red lines --- */
.home-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.28;
  background:
    /* Thin burgundy horizontals — varying intervals */
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 38px,
      rgba(var(--accent-rgb), 0.35) 38px,
      rgba(var(--accent-rgb), 0.35) 38.5px
    ),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 112px,
      rgba(var(--accent-rgb), 0.25) 112px,
      rgba(var(--accent-rgb), 0.25) 113px
    ),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 260px,
      rgba(var(--accent-rgb), 0.18) 260px,
      rgba(var(--accent-rgb), 0.18) 261px
    ),
    /* Occasional diagonal cross-lines */
    repeating-linear-gradient(
      82deg,
      transparent,
      transparent 180px,
      rgba(var(--accent-rgb), 0.12) 180px,
      rgba(var(--accent-rgb), 0.12) 180.5px
    );
  mask-image: radial-gradient(ellipse 65% 55% at 50% 42%, black 30%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse 65% 55% at 50% 42%, black 30%, transparent 72%);
  pointer-events: none;
}

/* --- Site Identity --- */
.site-identity {
  text-align: center;
  margin-bottom: 28px;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* brand-label, page-title-zh, page-subtitle-en, page-desc, page-desc-en
   are defined in common.css (Typography System) */

/* Homepage-specific overrides */
.site-identity .page-title-zh {
  font-size: 3.6rem;
  font-weight: 400;
  letter-spacing: 0.06em;
}

.site-identity .brand-label {
  margin-bottom: 24px;
  color: var(--accent-light);
  opacity: 0.7;
}

.site-identity .page-subtitle-en {
  margin-bottom: 0;
}

/* Descriptions below deck */
.home-desc {
  text-align: center;
  z-index: 2;
  margin-top: 36px;
  margin-bottom: 4px;
  font-size: 1rem;
}

.home-desc-en {
  text-align: center;
  z-index: 2;
  margin-bottom: 0;
  font-size: 0.85rem;
}

/* --- Deck Container --- */
.deck-container {
  position: relative;
  width: min(540px, 85vw);
  height: 460px;
  z-index: 2;
  perspective: 1200px;
  cursor: default;
}

/* Stacked cards (deck state) */
.deck-stack {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.deck-card {
  position: absolute;
  width: 140px;
  aspect-ratio: 2.5 / 3.5;
  background: var(--card-back);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-card);
  transition: transform 0.5s cubic-bezier(0.25, 0, 0, 1),
              opacity 0.5s ease,
              border-color var(--transition-slow),
              box-shadow var(--transition-slow);
  will-change: transform, opacity;
}

.deck-card:nth-child(1) { transform: rotate(-6deg) translateX(-8px) translateY(4px); }
.deck-card:nth-child(2) { transform: rotate(-2deg) translateX(-2px) translateY(1px); }
.deck-card:nth-child(3) { transform: rotate(2deg) translateX(2px) translateY(0px);  }
.deck-card:nth-child(4) { transform: rotate(6deg) translateX(8px) translateY(2px); }

.deck-card::before {
  content: '';
  position: absolute;
  inset: 6px;
  border-radius: calc(var(--radius-lg) - 2px);
  border: 1px solid rgba(255, 255, 255, 0.04);
  background:
    repeating-linear-gradient(
      45deg,
      transparent,
      transparent 3px,
      rgba(255, 255, 255, 0.015) 3px,
      rgba(255, 255, 255, 0.015) 4px
    ),
    repeating-linear-gradient(
      -45deg,
      transparent,
      transparent 3px,
      rgba(255, 255, 255, 0.015) 3px,
      rgba(255, 255, 255, 0.015) 4px
    );
  pointer-events: none;
}

.deck-card::after {
  content: '✦';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 1.4rem;
  color: rgba(255, 255, 255, 0.06);
  pointer-events: none;
}

/* --- Expanded Suits --- */
.suits-grid {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 520px;
  height: 420px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 24px;
  align-items: center;
  justify-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.5s cubic-bezier(0.33, 0, 0.67, 1);
}

.suits-grid.visible {
  opacity: 1;
  pointer-events: auto;
}

.suit-card-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 120px;
  aspect-ratio: 2.5 / 3.5;
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  transition: all var(--transition-medium);
  position: relative;
  will-change: transform;
}

.suit-card-wrapper:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(0, 0, 0, 0.5),
              0 0 0 1px rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.07);
  transition: transform 0.55s cubic-bezier(0.25, 0.1, 0.25, 1),
              box-shadow 0.55s ease,
              border-color 0.55s ease;
}

.suit-card-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.suit-card-symbol {
  font-size: 2.4rem;
  color: var(--text-primary);
  transition: all var(--transition-medium);
}

/* v1.29：♥♦ 用网站统一红（默认主题 --accent-light #8a2b3a）；蓝时/银沿用各自 accent-light，行为同前 */
.suit-card-wrapper[data-suit="hearts"] .suit-card-symbol,
.suit-card-wrapper[data-suit="diamonds"] .suit-card-symbol {
  color: var(--accent-light);
}

.suit-card-name {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--transition-gentle),
              transform var(--transition-gentle);
}

.suit-card-wrapper:hover .suit-card-name {
  opacity: 1;
  transform: translateY(0);
}

/* Mobile: show labels when suits grid is visible (no hover) */
.suits-grid.visible .suit-card-name {
  opacity: 1;
  transform: translateY(0);
}

/* --- Deck Hint --- */
.deck-hint {
  margin-top: 24px;
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-family: var(--font-sans);
  font-weight: 300;
  animation: hint-pulse 3.5s ease-in-out infinite;
  cursor: default;
  z-index: 2;
}

@keyframes hint-pulse {
  0%, 100% { opacity: 0.30; }
  50%      { opacity: 0.65;  }
}

.deck-hint.hidden {
  opacity: 0;
  animation: none;
  transition: opacity 0.6s ease;
}

/* --- Deck card hover glow — subtle, atmospheric --- */
.deck-stack:hover .deck-card {
  border-color: rgba(255, 255, 255, 0.07);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5),
              0 0 0 1px rgba(255, 255, 255, 0.02),
              0 0 32px rgba(var(--accent-rgb), 0.04);
  transition: border-color 0.8s ease,
              box-shadow 0.8s ease;
}

.deck-stack:hover .deck-card::after {
  color: rgba(255, 255, 255, 0.1);
  transition: color 0.6s ease;
}

/* --- Cursor Particle Canvas --- */
#particleCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}