/* ============================================
   DADAring Landing Page
   Brand colors: Primary #43C67A, Dark #35A866
   ============================================ */

:root {
  --primary: #43C67A;
  --primary-dark: #35A866;
  --primary-surface: #EAF8F0;
  --bg: #F5FFF9;
  --card: #FFFFFF;
  --text-primary: #2D3436;
  --text-secondary: #8E9AAB;
  --text-tertiary: #B8C5D0;
  --divider: #D8F0E3;
  --bronze: #D97706;
  --error: #EF4444;
  --font-kr: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-kr);
  color: var(--text-primary);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
  overflow-wrap: break-word;
}

a { color: var(--primary-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Nav ── */
.nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--divider);
  z-index: 100;
}
.nav-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 22px;
  font-weight: 800;
  color: var(--primary-dark);
  letter-spacing: -0.5px;
}
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--primary-dark); text-decoration: none; }

/* ── Hero ── */
.hero {
  padding: 140px 24px 80px;
  text-align: center;
  background: linear-gradient(180deg, var(--card) 0%, var(--bg) 100%);
}
.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--primary-surface);
  color: var(--primary-dark);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
}
.hero h1 {
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 16px;
}
.hero h1 .accent { color: var(--primary); }
.hero .subtitle {
  font-size: clamp(16px, 2.5vw, 20px);
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.6;
}
.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  background: var(--primary);
  color: white;
  border-radius: 14px;
  font-size: 16px;
  font-weight: 700;
  transition: background 0.2s, transform 0.1s;
  box-shadow: 0 4px 16px rgba(67, 198, 122, 0.3);
}
.hero-cta:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  text-decoration: none;
}

/* ── Features ── */
.features {
  max-width: 1080px;
  margin: 0 auto;
  padding: 80px 24px;
}
.features h2 {
  text-align: center;
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 12px;
}
.features .section-sub {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 48px;
  font-size: 15px;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.feature-card {
  background: var(--card);
  border: 1px solid var(--divider);
  border-radius: 16px;
  padding: 28px;
  transition: box-shadow 0.2s, transform 0.2s;
}
.feature-card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}
.feature-icon {
  font-size: 32px;
  margin-bottom: 16px;
}
.feature-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}
.feature-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ── Use Cases ── */
.usecases {
  background: var(--card);
  border-top: 1px solid var(--divider);
  padding: 80px 24px;
}
.usecases-inner {
  max-width: 1080px;
  margin: 0 auto;
}
.usecases h2 {
  text-align: center;
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 12px;
}
.usecases .section-sub {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 48px;
  font-size: 15px;
}
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}
.usecase-card {
  background: var(--bg);
  border-radius: 16px;
  padding: 28px;
}
.usecase-emoji {
  font-size: 32px;
  margin-bottom: 14px;
}
.usecase-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
}
.usecase-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  font-style: italic;
}

/* ── Stats ── */
.stats {
  background: var(--card);
  border-top: 1px solid var(--divider);
  border-bottom: 1px solid var(--divider);
  padding: 60px 24px;
}
.stats-inner {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  justify-content: space-around;
  text-align: center;
  flex-wrap: wrap;
  gap: 32px;
}
.stat-item .stat-value {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
}
.stat-item .stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 6px;
}

/* ── About ── */
.about {
  max-width: 720px;
  margin: 0 auto;
  padding: 80px 24px;
  text-align: center;
}
.about h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 16px;
}
.about p {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
}
.about p .accent {
  color: var(--primary-dark);
}
.about .about-vision {
  margin-top: 24px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.6;
}

/* ── CTA Banner ── */
.cta-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: 60px 24px;
  text-align: center;
  color: white;
}
.cta-banner h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 12px;
}
.cta-banner p {
  font-size: 15px;
  opacity: 0.9;
  margin-bottom: 28px;
}
.cta-banner .hero-cta {
  background: white;
  color: var(--primary-dark);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
.cta-banner .hero-cta:hover { background: #f0f0f0; }

/* ── Footer ── */
.footer {
  background: var(--text-primary);
  color: rgba(255,255,255,0.7);
  padding: 48px 24px;
}
.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 32px;
}
.footer-brand .footer-logo {
  font-size: 20px;
  font-weight: 800;
  color: white;
  margin-bottom: 8px;
}
.footer-brand p { font-size: 13px; line-height: 1.6; }
.footer-links h4 {
  color: white;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 12px;
}
.footer-links ul { list-style: none; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { color: rgba(255,255,255,0.7); font-size: 13px; }
.footer-links a:hover { color: white; }
.footer-bottom {
  max-width: 1080px;
  margin: 32px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 12px;
  text-align: center;
}

/* ── Legal Pages ── */
.legal {
  max-width: 720px;
  margin: 0 auto;
  padding: 120px 24px 80px;
}
.legal h1 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 8px;
}
.legal .legal-date {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 40px;
}
.legal h2 {
  font-size: 18px;
  font-weight: 700;
  margin-top: 32px;
  margin-bottom: 12px;
}
.legal p, .legal li {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 12px;
}
.legal ul { padding-left: 20px; }

/* ── Responsive ── */
@media (max-width: 640px) {
  .nav-links { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .stats-inner { flex-direction: column; }
  .footer-inner { flex-direction: column; }
}