/* =============================
   Pink Romantic Theme (CSS)
   ============================= */
:root {
  /* Pink palette */
  --pink-100: #fff0f6;
  --pink-200: #ffd6e9;
  --pink-300: #ffb3d1;
  --pink-400: #ff99cc; /* required */
  --pink-500: #ff70b8; /* required */
  --pink-600: #ff4da6; /* required */
  --pink-700: #e63d97;

  /* Neutrals */
  --bg: #fff7fb;
  --text: #401a2a;
  --muted: #6b3b51;
  --card: #ffffff;
  --shadow: 0 10px 30px rgba(255, 77, 166, 0.15);
  --ring: 0 0 0 3px rgba(255, 77, 166, 0.25);
}

/* Dark theme overrides */
body.dark {
  --bg: #160d13;
  --text: #ffe6f1;
  --muted: #f8c6dc;
  --card: #20121a;
  --shadow: 0 10px 30px rgba(255, 153, 204, 0.12);
  --ring: 0 0 0 3px rgba(255, 153, 204, 0.2);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Poppins', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.sacramento { font-family: 'Sacramento', cursive; }

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 6rem 0 5rem;
  background:
    radial-gradient(1200px 600px at 10% -10%, var(--pink-100), transparent 60%),
    radial-gradient(900px 500px at 100% 10%, var(--pink-200), transparent 60%),
    linear-gradient(180deg, var(--pink-100), transparent 60%);
}

.title {
  font-size: clamp(2.5rem, 6vw, 5rem);
  margin: 0 0 .25rem 0;
  color: var(--pink-700);
  text-shadow: 0 6px 20px rgba(255, 77, 166, .25);
}

.subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  color: var(--muted);
  margin: 0 0 1.25rem 0;
}

.actions { display: flex; gap: .75rem; flex-wrap: wrap; }

.btn {
  appearance: none;
  border: 0;
  background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
  color: white;
  padding: .7rem 1rem;
  border-radius: 12px;
  box-shadow: var(--shadow);
  font-weight: 600;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .2s ease, filter .2s ease;
}
.btn:hover { transform: translateY(-2px); filter: brightness(1.03); }
.btn:active { transform: translateY(0); }
.btn[aria-pressed="true"] { box-shadow: 0 0 0 4px rgba(255, 77, 166, .3), var(--shadow); }

/* Hearts */
#hearts-container {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.heart {
  position: absolute;
  bottom: -40px;
  width: 20px; height: 20px;
  background: var(--pink-500);
  transform: rotate(45deg);
  border-radius: 4px;
  box-shadow: 0 8px 20px rgba(255, 77, 166, .35);
  animation: floatUp linear forwards;
}
.heart::before, .heart::after {
  content: '';
  position: absolute;
  width: 100%; height: 100%;
  background: inherit;
  border-radius: 50%;
}
.heart::before { top: -50%; left: 0; }
.heart::after { left: -50%; top: 0; }

@keyframes floatUp {
  0% { transform: translateY(0) rotate(45deg) scale(0.9); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: .9; }
  100% { transform: translateY(-110vh) rotate(45deg) scale(1.1); opacity: 0; }
}

/* Gallery */
.gallery-section { padding: 3rem 0 2rem; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.1rem;
}
.card {
  background: var(--card);
  border-radius: 16px;
  box-shadow: var(--shadow);
  overflow: hidden;
  cursor: pointer;
  outline: none;
  transition: transform .2s ease, box-shadow .2s ease;
}
.card:hover, .card:focus { transform: translateY(-6px); box-shadow: 0 14px 40px rgba(255, 77, 166, .2); }
.card img { width: 100%; height: 220px; object-fit: cover; display: block; }
.card figcaption { padding: .75rem .9rem 1rem; font-weight: 600; color: var(--muted); }

/* Letter */
.letter-section { padding: 2rem 0 4rem; }
.letter-card {
  background: var(--card);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 1.5rem 1.2rem;
  border: 1px solid rgba(255, 77, 166, .12);
}
.letter-card .greeting { font-weight: 600; color: var(--muted); }
.letter-card .signature { margin-top: 1rem; color: var(--pink-700); font-size: 1.3rem; }

/* Lightbox */
.lightbox[hidden] { display: none; }
.lightbox {
  position: fixed; inset: 0;
  display: grid; place-items: center;
  z-index: 50;
}
.lightbox-backdrop {
  position: absolute; inset: 0; background: rgba(0,0,0,.5);
}
.lightbox-content {
  position: relative;
  background: var(--card);
  border-radius: 16px;
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
  max-width: min(92vw, 920px);
  width: 100%;
  padding: .75rem .75rem 1rem;
}
.lightbox-content img { width: 100%; height: auto; display: block; border-radius: 12px; }
.lightbox-content .caption { margin: .6rem .25rem 0; color: var(--muted); text-align: center; }
.lightbox-close {
  position: absolute; top: .4rem; right: .55rem;
  width: 36px; height: 36px; border-radius: 50%;
  border: 0; cursor: pointer;
  background: linear-gradient(135deg, var(--pink-500), var(--pink-600));
  color: #fff; font-size: 22px; line-height: 1;
  box-shadow: var(--shadow);
}

/* Footer */
.footer { padding: 2rem 0 3rem; text-align: center; color: var(--muted); }

/* Reveal animations */
.reveal { opacity: 0; transform: translateY(12px); animation: fadeUp .75s ease forwards; animation-delay: var(--delay, 0s); }
@keyframes fadeUp { to { opacity: 1; transform: translateY(0);} }

/* Visually hidden for a11y */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }