:root {
  --bg-1: #031126;
  --bg-2: #062a59;
  --cyan: #2cc8ff;
  --blue: #1686ff;
  --text: #f7fbff;
  --muted: #b9d4ee;
  --panel: rgba(255,255,255,.08);
  --border: rgba(255,255,255,.14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 15%, rgba(44,200,255,.18), transparent 28%),
    radial-gradient(circle at 85% 20%, rgba(22,134,255,.18), transparent 30%),
    linear-gradient(145deg, var(--bg-1), var(--bg-2));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.55), transparent 80%);
}

.page-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px 18px 36px;
}

.hero {
  width: min(1120px, 100%);
  text-align: center;
}

.brand-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  margin-bottom: 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  backdrop-filter: blur(8px);
  color: #dff6ff;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  font-size: .78rem;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.05;
}

.subtitle,
.hint {
  color: var(--muted);
}

.subtitle {
  margin: 10px 0 24px;
  font-size: clamp(1rem, 2vw, 1.15rem);
}

.card-stage {
  perspective: 1600px;
  width: min(980px, 100%);
  margin: 0 auto;
  padding: 8px;
}

.card {
  --rx: 0deg;
  --ry: 0deg;
  --turn: 0deg;
  position: relative;
  width: 100%;
  aspect-ratio: 1750 / 1000;
  transform-style: preserve-3d;
  transform: rotateX(var(--rx)) rotateY(calc(var(--turn) + var(--ry)));
  transition: transform .34s cubic-bezier(.3,.7,.2,1), filter .25s ease;
  cursor: pointer;
  filter: drop-shadow(0 28px 40px rgba(0,0,0,.38));
  outline: none;
}

.card:hover { filter: drop-shadow(0 34px 48px rgba(0,0,0,.44)); }
.card:focus-visible { box-shadow: 0 0 0 4px rgba(44,200,255,.45); border-radius: 28px; }
.card-face {
  position: absolute;
  inset: 0;
  border-radius: 28px;
  overflow: hidden;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: #fff;
}

.card-face img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  user-select: none;
  -webkit-user-drag: none;
}

.actions {
  margin: 28px auto 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.action-btn {
  color: #fff;
  text-decoration: none;
  padding: 12px 16px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,.16);
  background: linear-gradient(180deg, rgba(255,255,255,.12), rgba(255,255,255,.07));
  box-shadow: inset 0 1px 0 rgba(255,255,255,.12);
  backdrop-filter: blur(10px);
  transition: transform .2s ease, background .2s ease, border-color .2s ease;
  font-weight: 650;
}

.action-btn:hover,
.action-btn:focus-visible {
  transform: translateY(-2px);
  background: linear-gradient(180deg, rgba(44,200,255,.20), rgba(22,134,255,.16));
  border-color: rgba(44,200,255,.45);
}

.hint {
  margin-top: 16px;
  font-size: .9rem;
}

@media (max-width: 900px) {
  .page-shell {
    padding: 22px 14px 30px;
  }

  .hero {
    width: min(100%, 860px);
  }

  .card-stage {
    width: 100%;
    padding: 4px;
  }

  .actions {
    margin-top: 22px;
  }
}

@media (max-width: 700px) {
  .page-shell {
    min-height: 100svh;
    padding:
      max(16px, env(safe-area-inset-top))
      max(10px, env(safe-area-inset-right))
      max(22px, env(safe-area-inset-bottom))
      max(10px, env(safe-area-inset-left));
  }

  .brand-kicker {
    margin-bottom: 8px;
    padding: 7px 12px;
    font-size: .72rem;
  }

  h1 {
    font-size: clamp(1.7rem, 8vw, 2.35rem);
  }

  .subtitle {
    margin: 8px 0 18px;
    font-size: .98rem;
  }

  .card-stage {
    padding: 0;
  }

  .card {
    filter: drop-shadow(0 18px 28px rgba(0,0,0,.34));
  }

  .card-face {
    border-radius: clamp(12px, 3.5vw, 20px);
  }

  .actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: min(100%, 620px);
    gap: 10px;
    margin-top: 20px;
  }

  .action-btn {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 11px 12px;
    text-align: center;
    line-height: 1.2;
  }

  .hint {
    margin-top: 13px;
    font-size: .82rem;
  }
}

@media (max-width: 460px) {
  .page-shell {
    padding-left: 8px;
    padding-right: 8px;
  }

  .subtitle {
    margin-bottom: 14px;
  }

  .actions {
    grid-template-columns: 1fr;
    width: min(100%, 360px);
  }

  .hint {
    display: none;
  }
}

@media (max-height: 560px) and (orientation: landscape) {
  .page-shell {
    display: block;
    padding: 10px 14px 14px;
  }

  .hero {
    margin: 0 auto;
  }

  .brand-kicker,
  h1,
  .subtitle,
  .hint {
    display: none;
  }

  .card-stage {
    width: min(72vw, 780px);
  }

  .actions {
    margin-top: 10px;
  }

  .action-btn {
    padding: 9px 12px;
    min-height: 42px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}