:root {
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --text: #1c1f26;
  --muted: #6b7280;
  --border: #e3e5ea;
  --accent: #2f6fed;
  --accent-dark: #1f4fbb;
  --success: #1a9e5c;
  --error: #d0342c;
  --radius: 12px;
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
}

.wrap {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
}

a { color: var(--accent); }

.site-header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
}
.site-header .wrap { display: flex; align-items: center; }
.brand {
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
  color: var(--text);
}

main.wrap { padding: 32px 20px 60px; }

.intro { max-width: 640px; margin-bottom: 32px; }
.intro h1 { font-size: 1.9rem; margin-bottom: 8px; }
.intro p { color: var(--muted); }

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

.image-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  display: block;
  transition: transform .15s ease, box-shadow .15s ease;
}
.image-card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(20,20,40,.08); }
.image-card-thumb { aspect-ratio: 4 / 3; overflow: hidden; background: #eee; }
.image-card-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.image-card-body { padding: 16px; }
.image-card-body h2 { font-size: 1.05rem; margin: 0 0 10px; }
.image-card-meta { color: var(--muted); font-size: .9rem; margin: 8px 0 4px; }
.image-card-price { font-weight: 600; margin: 4px 0 0; }

.progress-bar {
  background: #e7e9ee;
  border-radius: 999px;
  height: 8px;
  overflow: hidden;
}
.progress-bar-fill {
  background: linear-gradient(90deg, var(--accent), #6fa1ff);
  height: 100%;
  transition: width .4s ease;
}

.empty-state { color: var(--muted); }

.back-link { display: inline-block; margin-bottom: 20px; text-decoration: none; }

.image-detail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
}

.reveal-frame {
  background: #eee;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  width: 100%;
}
.reveal-frame img { width: 100%; height: auto; display: block; }

.buy-panel {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  width: 100%;
  max-width: 640px;
}
.buy-panel h1 { font-size: 1.4rem; margin: 0 0 16px; text-align: center; }
.price-info { color: var(--muted); margin: 14px 0 18px; text-align: center; }

fieldset { border: none; padding: 0; margin: 0 0 20px; }
legend { font-weight: 600; margin-bottom: 10px; padding: 0; }

.option-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}
.option {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  cursor: pointer;
  position: relative;
}
.option input { position: absolute; top: 10px; right: 10px; }
.option span { font-weight: 600; }
.option small { color: var(--muted); }
.option:has(input:checked) { border-color: var(--accent); background: #eef3ff; }
.option-disabled { opacity: .4; cursor: not-allowed; }

.buyer-fields {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}
.buyer-fields label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: .88rem;
  font-weight: 600;
}
.buyer-fields input {
  font-weight: 400;
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .95rem;
}
.optional-tag { color: var(--muted); font-weight: 400; }
.buyer-fields-hint { color: var(--muted); font-size: .8rem; }

.consent-check {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 16px;
  cursor: pointer;
}
.consent-check input {
  margin-top: 3px;
  flex-shrink: 0;
}
.consent-check span {
  font-size: .85rem;
  color: var(--muted);
  font-weight: 400;
  line-height: 1.4;
}
.consent-check a { color: var(--accent); }

.leaderboard { width: 100%; max-width: 640px; }
.leaderboard h2 { text-align: center; font-size: 1.15rem; margin-bottom: 14px; }
.leaderboard-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
@media (max-width: 520px) {
  .leaderboard-grid { grid-template-columns: 1fr; }
}
.leaderboard-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  text-align: center;
}
.leaderboard-card h3 { margin: 0 0 8px; font-size: .85rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .02em; }
.leaderboard-name { font-size: 1.2rem; font-weight: 700; margin: 0; }
.leaderboard-meta { color: var(--muted); margin: 4px 0 0; font-size: .9rem; }
.leaderboard-empty { color: var(--muted); font-size: .9rem; margin: 8px 0 0; }

.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 13px 20px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  text-align: center;
  text-decoration: none;
}
.btn-primary:hover { background: var(--accent-dark); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; }

.error-text { color: var(--error); margin-top: 12px; font-size: .9rem; }

.result-page { max-width: 560px; margin: 40px auto; text-align: center; }
.result-page h1 { margin-bottom: 12px; }
.result-page p { color: var(--muted); margin-bottom: 24px; }

.legal-page { max-width: 720px; margin: 0 auto 40px; }
.legal-page h1 { font-size: 1.7rem; margin-bottom: 8px; }
.legal-page > p { color: var(--muted); }
.legal-page h2 { font-size: 1.3rem; margin: 40px 0 12px; padding-top: 8px; border-top: 1px solid var(--border); }
.legal-page section:first-of-type h2 { border-top: none; padding-top: 0; }
.legal-page h3 { font-size: 1.05rem; margin: 22px 0 8px; }
.legal-page h4 { font-size: .95rem; margin: 16px 0 6px; color: var(--muted); }
.legal-page p, .legal-page li { line-height: 1.6; }
.legal-page ul { padding-left: 22px; margin: 8px 0; }
.legal-page li { margin-bottom: 4px; }
.legal-toc {
  display: flex;
  gap: 16px;
  margin: 16px 0 24px;
  padding: 12px 16px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  color: var(--muted);
  font-size: .85rem;
}