/* Layout: cheerful light "thank you" — pink + cyan-green, 3D waving characters in the hero,
   countdown, letter card, memories slideshow. Deliberately single light theme. */
:root {
  --pink-1: #ffe3ef;
  --pink-2: #ffd0e4;
  --mint-1: #d9fbf1;
  --mint-2: #bff3e6;
  --bg: #fff3f8;
  --surface: rgba(255, 255, 255, 0.72);
  --ink: #3b2a3a;
  --ink-soft: rgba(59, 42, 58, 0.72);
  --ink-faint: rgba(59, 42, 58, 0.5);
  --accent: #10b5a3;        /* cyan-green */
  --accent-deep: #0a8f80;
  --pink: #ff6fab;
  --gutter: 16px;
  --maxw: 640px;
  color-scheme: light;
  --serif: "Fredoka", "Cormorant Garamond", Georgia, serif;
  --sans: "Nunito", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Fixed soft gradient background */
.bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(90% 70% at 15% 0%, var(--pink-1), transparent 60%),
    radial-gradient(90% 70% at 90% 15%, var(--mint-1), transparent 55%),
    linear-gradient(170deg, var(--pink-2), var(--mint-2));
}

.kicker {
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-deep);
  font-weight: 700;
  margin: 0 0 0.9rem;
}

/* ---------- Landing / entry ---------- */
.landing {
  position: relative;
  z-index: 3;
  min-height: 100%;
  display: grid;
  place-items: center;
  text-align: center;
  padding-left: max(var(--gutter), env(safe-area-inset-left, 0px));
  padding-right: max(var(--gutter), env(safe-area-inset-right, 0px));
  padding-block: 2rem;
}
.landing.fade-out { animation: fadeOut 0.6s ease forwards; }
.landing-inner { max-width: var(--maxw); }

.title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.6rem, 11vw, 4.6rem);
  line-height: 1.02;
  margin: 0 0 1.8rem;
  letter-spacing: 0.005em;
  text-wrap: balance;
  color: var(--ink);
}
.title .amp { color: var(--pink); }

.enter-btn {
  appearance: none;
  border: none;
  background: var(--accent);
  color: #042e29;
  font-family: var(--sans);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  padding: 0.95rem 2.2rem;
  border-radius: 999px;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(16, 181, 163, 0.28);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.enter-btn:hover { background: var(--accent-deep); color: #fff; transform: translateY(-1px); }
.enter-btn:active { transform: scale(0.97); }
.enter-btn:focus-visible { outline: 3px solid var(--pink); outline-offset: 3px; }
.enter-btn.pulse { animation: pulse 2.6s ease-in-out infinite; }

.hint { color: var(--ink-faint); font-size: 0.85rem; margin: 1.1rem 0 0; }

/* ---------- Main content ---------- */
.content {
  position: relative;
  z-index: 3;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: max(var(--gutter), env(safe-area-inset-left, 0px));
  padding-right: max(var(--gutter), env(safe-area-inset-right, 0px));
  padding-bottom: calc(3rem + env(safe-area-inset-bottom, 0px));
}
.content.reveal { animation: fadeIn 1s ease both; }

.hero {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding-block: 2.2rem;
}

/* 3D stage */
.stage {
  position: relative;
  width: 100%;
  max-width: 520px;
  aspect-ratio: 1.3;
  isolation: isolate;
  margin-bottom: 0.8rem;
  background:
    radial-gradient(ellipse at 29% 45%, rgba(255, 221, 232, 0.65), transparent 48%),
    radial-gradient(ellipse at 73% 43%, rgba(218, 248, 237, 0.75), transparent 48%);
}
.stage canvas { position: absolute; inset: 0; display: block; width: 100% !important; height: 100% !important; }
.stage-fallback { position: absolute; inset: 0; display: none; font-size: 4rem; place-items: center; }
.stage.no-webgl .stage-fallback { display: grid; }

.hero-line {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.4rem, 6vw, 2rem);
  color: var(--ink);
  margin: 0 0 1.6rem;
}
.hero-sub {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.2rem, 5vw, 1.6rem);
  color: var(--ink-soft);
  margin: 0 0 1rem;
}

/* ---------- Countdown ---------- */
.countdown { display: flex; gap: clamp(0.5rem, 4vw, 1.4rem); justify-content: center; }
.unit {
  display: flex; flex-direction: column; align-items: center;
  min-width: 3.6rem;
  background: var(--surface);
  border-radius: 16px;
  padding: 0.7rem 0.6rem 0.55rem;
  box-shadow: 0 8px 20px rgba(59, 42, 58, 0.08);
}
.num {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2.2rem, 10vw, 3.4rem);
  line-height: 1;
  color: var(--accent-deep);
  font-variant-numeric: tabular-nums;
}
.lbl { font-size: 0.64rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-faint); margin-top: 0.45rem; font-weight: 700; }
.countdown-target { color: var(--ink-soft); margin-top: 1.5rem; font-size: 0.95rem; font-weight: 600; }
.countdown-done { font-family: var(--serif); font-size: clamp(1.5rem, 7vw, 2.3rem); margin: 0.5rem 0 0; color: var(--pink); }

/* ---------- Cards / letter ---------- */
.card {
  background: var(--surface);
  border-radius: 22px;
  padding: 1.8rem 1.4rem;
  box-shadow: 0 12px 30px rgba(59, 42, 58, 0.08);
}
.letter { margin-top: 1rem; }
.letter-heading {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.6rem, 7vw, 2.2rem);
  text-align: center;
  margin: 0 0 1.4rem;
  text-wrap: balance;
}
.letter-body { font-size: 1.05rem; color: var(--ink-soft); }
.letter-body p { margin: 0 0 1.1rem; }
.letter-body em { color: var(--ink-faint); }

/* ---------- Memories slideshow ---------- */
.memories { margin-top: 2rem; }
.memories h2 {
  font-family: var(--serif);
  font-weight: 600;
  text-align: center;
  font-size: clamp(1.4rem, 6vw, 1.9rem);
  margin: 0 0 1rem;
}
.slideshow {
  position: relative;
  width: 100%;
  height: clamp(220px, 46vw, 340px);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 12px 30px rgba(59, 42, 58, 0.12);
  background: var(--pink-2);
}
.slideshow .slide {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  opacity: 0; transition: opacity 1.4s ease-in-out;
}
.slideshow .slide.show { opacity: 1; }

.footer { text-align: center; color: var(--ink-faint); font-size: 0.92rem; padding-top: 2.2rem; }
.footer .heart { color: var(--pink); }

/* ---------- Sound toggle ---------- */
.sound-toggle {
  position: fixed;
  z-index: 5;
  right: calc(var(--gutter) + env(safe-area-inset-right, 0px));
  bottom: calc(var(--gutter) + env(safe-area-inset-bottom, 0px));
  width: 52px; height: 52px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #042e29;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(16, 181, 163, 0.35);
  display: grid; place-items: center;
  transition: transform 0.15s ease, background 0.2s ease;
}
.sound-toggle:hover { background: var(--accent-deep); color: #fff; }
.sound-toggle:active { transform: scale(0.92); }
.sound-toggle:focus-visible { outline: 3px solid var(--pink); outline-offset: 2px; }

/* ---------- Animations ---------- */
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; visibility: hidden; } }
@keyframes pulse { 0%,100% { box-shadow: 0 10px 24px rgba(16,181,163,0.28); } 50% { box-shadow: 0 10px 28px rgba(16,181,163,0.5); } }

@media (prefers-reduced-motion: reduce) {
  .slideshow .slide { transition: opacity 0.35s linear; }
  .enter-btn.pulse, .content.reveal, .landing.fade-out { animation: none; }
  .landing.fade-out { opacity: 0; }
}