/* =============================================
   KyudoChecker — Vercel Static Site Styles
   ============================================= */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --accent: #007AFF;
  --accent-dark: #0056b3;
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --text: #1d1d1f;
  --text-secondary: #6e6e73;
  --border: #d2d2d7;
  --green: #34C759;
  --radius: 16px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Hero ── */
.hero {
  background: linear-gradient(160deg, #f0f7ff 0%, #e8f4fd 60%, #f5f5f7 100%);
  text-align: center;
  padding: 80px 0 60px;
}

.hero-icon {
  font-size: 72px;
  margin-bottom: 16px;
  line-height: 1;
}

.hero-title {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 8px;
}

.hero-subtitle {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 20px;
  letter-spacing: 0.01em;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto 28px;
  line-height: 1.7;
}

.hero-badge {
  margin-bottom: 28px;
}

.badge-note {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: rgba(0,0,0,0.05);
  border-radius: 20px;
  padding: 6px 16px;
}

.btn-appstore {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--text);
  color: white;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 28px;
  border-radius: 14px;
  transition: background 0.2s, transform 0.15s;
  margin-bottom: 12px;
}

.btn-appstore:hover {
  background: #333;
  transform: translateY(-1px);
}

.appstore-note {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ── Sections ── */
.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: 40px;
  color: var(--text);
}

/* ── Concept ── */
.section-concept { padding: 60px 0; }

.concept-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

.concept-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.concept-card h2 {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 16px;
  color: var(--text);
}

.concept-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── Features ── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
}

.feature-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Metrics ── */
.metrics-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
  max-width: 700px;
  margin: 0 auto;
}

.metric-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: white;
  border-radius: 12px;
  padding: 14px 20px;
  font-size: 0.95rem;
  border: 1px solid var(--border);
}

.phase-tag {
  display: inline-block;
  background: var(--accent);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 20px;
  white-space: nowrap;
  min-width: 60px;
  text-align: center;
}

/* ── How to ── */
.how-to-list {
  list-style: none;
  counter-reset: steps;
  max-width: 620px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.how-to-list li {
  counter-increment: steps;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  font-size: 0.95rem;
  color: var(--text);
  line-height: 1.6;
}

.how-to-list li::before {
  content: counter(steps);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

.how-to-list li strong {
  color: var(--accent);
  margin-right: 6px;
}

/* ── Privacy summary ── */
.section-privacy-summary {
  text-align: center;
}

.privacy-box {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 580px;
  margin: 0 auto 28px;
  text-align: left;
}

.privacy-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: white;
  border-radius: 12px;
  padding: 18px 20px;
  border: 1px solid var(--border);
}

.privacy-icon {
  font-size: 1.4rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.privacy-item strong {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.privacy-item p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
}

.link-privacy {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
}

.link-privacy:hover { text-decoration: underline; }

/* ── Footer ── */
.footer {
  background: var(--text);
  color: white;
  padding: 40px 0;
  text-align: center;
}

.footer-app {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}

.footer-nav a {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s;
}

.footer-nav a:hover { color: white; }

.footer-copy {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.4);
}

/* ── Privacy Policy page ── */
.policy-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 24px;
}

.policy-page h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.policy-page .updated {
  color: var(--text-secondary);
  font-size: 0.875rem;
  margin-bottom: 40px;
}

.policy-page h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 32px 0 12px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--accent);
}

.policy-page p, .policy-page li {
  font-size: 0.95rem;
  color: #333;
  line-height: 1.75;
  margin-bottom: 12px;
}

.policy-page ul { padding-left: 20px; }

.policy-lang-divider {
  border: none;
  border-top: 2px solid var(--border);
  margin: 48px 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 32px;
}

.back-link:hover { text-decoration: underline; }

/* ── Responsive ── */
@media (max-width: 600px) {
  .hero { padding: 60px 0 48px; }
  .section { padding: 52px 0; }
  .concept-card { padding: 28px 20px; }
  .metrics-list { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
}