/* ============================================================
   3×3 ANS DE RELATION — Feuille de styles
   ============================================================ */

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --gold:        #c9a84c;
  --gold-light:  #e8c97a;
  --gold-dim:    #7a5f28;
  --cream:       #f5efe6;
  --bg:          #0d0a06;
  --bg-2:        #14100b;
  --bg-card:     #1a1410;
  --text:        #e8dcc8;
  --text-dim:    #8a7a60;
  --border:      rgba(201, 168, 76, 0.3);

  --card-radius: 18px;
  --flip-speed:  0.75s;

  --font-display: 'Playfair Display', Georgia, serif;
  --font-body:    'Cormorant Garamond', 'Garamond', Georgia, serif;
}

/* ── Reset & Base ───────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Particules de fond ─────────────────────────────────────── */
.particles {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: var(--gold);
  opacity: 0;
  animation: floatUp var(--dur, 8s) ease-in infinite;
  animation-delay: var(--delay, 0s);
}

@keyframes floatUp {
  0%   { transform: translateY(100vh) scale(0); opacity: 0; }
  10%  { opacity: 0.6; }
  90%  { opacity: 0.2; }
  100% { transform: translateY(-10vh) scale(1.5); opacity: 0; }
}

/* ── Hero ───────────────────────────────────────────────────── */
.hero {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 80px 24px 60px;
}

.hero__subtitle {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 1rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--gold-dim);
  margin-bottom: 16px;
  animation: fadeDown 1s ease both;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cream);
  letter-spacing: -0.01em;
  animation: fadeDown 1s 0.2s ease both;
  text-shadow: 0 0 60px rgba(201, 168, 76, 0.25);
}

.hero__title em {
  font-style: italic;
  color: var(--gold);
  display: block;
  font-size: 0.85em;
}

.hero__tagline {
  margin-top: 20px;
  font-size: 1.05rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  animation: fadeDown 1s 0.4s ease both;
}

.hero__ornament {
  font-size: 0.75rem;
  letter-spacing: 0.5em;
  color: var(--gold-dim);
  animation: fadeDown 1s 0.6s ease both;
}

.hero__ornament--top  { margin-bottom: 24px; }
.hero__ornament--bottom { margin-top: 24px; }

/* ── Section cartes ─────────────────────────────────────────── */
.cards-section {
  position: relative;
  z-index: 1;
  padding: 0 24px 80px;
  text-align: center;
}

.cards-hint {
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 48px;
  animation: fadeDown 1s 0.8s ease both;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1100px;
  margin: 0 auto;
}

/* ── Carte ──────────────────────────────────────────────────── */
.card {
  perspective: 1200px;
  cursor: pointer;
  height: 400px;
  animation: fadeUp 0.8s ease both;
}

.card:nth-child(1) { animation-delay: 1s; }
.card:nth-child(2) { animation-delay: 1.2s; }
.card:nth-child(3) { animation-delay: 1.4s; }

.card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform var(--flip-speed) cubic-bezier(0.45, 0.05, 0.55, 0.95);
  border-radius: var(--card-radius);
}

.card.flipped .card__inner {
  transform: rotateY(180deg);
}

/* Faces commune */
.card__face {
  position: absolute;
  inset: 0;
  border-radius: var(--card-radius);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 36px 28px;
  overflow: hidden;
  border: 1px solid var(--border);
}

/* ── Face recto ─────────────────────────────────────────────── */
.card__face--front {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(201,168,76,0.12) 0%, transparent 60%),
    var(--bg-card);
  gap: 12px;
  transition: box-shadow 0.3s, transform 0.3s;
}

.card:hover:not(.flipped) .card__face--front {
  box-shadow:
    0 20px 60px rgba(0,0,0,0.6),
    0 0 40px rgba(201,168,76,0.15),
    inset 0 1px 0 rgba(201,168,76,0.2);
  transform: translateY(-6px);
}

.card__number {
  font-family: var(--font-display);
  font-size: 0.9rem;
  letter-spacing: 0.4em;
  color: var(--gold-dim);
  text-transform: uppercase;
}

.card__icon {
  font-size: 2.8rem;
  margin: 8px 0;
  filter: drop-shadow(0 0 12px rgba(201,168,76,0.5));
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50%       { transform: scale(1.08); }
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--cream);
  letter-spacing: 0.05em;
  text-align: center;
}

.card__hint {
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold-dim);
  margin-top: 4px;
}

/* Effet shimmer */
.card__shimmer {
  position: absolute;
  inset: -50%;
  background: linear-gradient(
    105deg,
    transparent 40%,
    rgba(201,168,76,0.08) 50%,
    transparent 60%
  );
  transform: translateX(-150%);
  pointer-events: none;
}

.card:hover:not(.flipped) .card__shimmer {
  animation: shimmer 1.4s ease;
}

@keyframes shimmer {
  to { transform: translateX(150%); }
}

/* Ligne décorative sur les bords */
.card__face--front::before {
  content: '';
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(201,168,76,0.1);
  border-radius: calc(var(--card-radius) - 4px);
  pointer-events: none;
}

/* ── Face verso ─────────────────────────────────────────────── */
.card__face--back {
  background:
    radial-gradient(ellipse at 50% 100%, rgba(201,168,76,0.1) 0%, transparent 60%),
    linear-gradient(160deg, #1f1810 0%, #100d08 100%);
  transform: rotateY(180deg);
  gap: 16px;
  text-align: center;
  box-shadow:
    0 20px 60px rgba(0,0,0,0.7),
    0 0 40px rgba(201,168,76,0.1);
}

.card__back-title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: 0.04em;
}

.card__back-text {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text);
  font-style: italic;
  max-width: 280px;
}

.card__back-ornament {
  font-size: 0.7rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--gold-dim);
  margin-top: 4px;
}

.card__face--back::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-dim), transparent);
  margin-bottom: 16px;
}

/* ── Footer ─────────────────────────────────────────────────── */
.footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 32px 24px 48px;
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.footer__heart {
  color: var(--gold);
  font-size: 1rem;
  animation: heartbeat 1.6s ease-in-out infinite;
}

@keyframes heartbeat {
  0%, 100% { transform: scale(1); }
  30%       { transform: scale(1.25); }
  50%       { transform: scale(1); }
  70%       { transform: scale(1.15); }
}

/* ── Animations d'entrée ────────────────────────────────────── */
@keyframes fadeDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 900px) {
  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
    max-width: 640px;
  }

  .card:nth-child(3) {
    grid-column: 1 / -1;
    max-width: 300px;
    margin: 0 auto;
    width: 100%;
  }
}

@media (max-width: 560px) {
  .hero {
    padding: 60px 20px 48px;
  }

  .cards-grid {
    grid-template-columns: 1fr;
    max-width: 320px;
    gap: 24px;
  }

  .card:nth-child(3) {
    grid-column: auto;
    max-width: none;
  }

  .card {
    height: 360px;
  }

  .card__back-text {
    font-size: 0.88rem;
  }
}