/* ============================================
   Coinlio — Shared Design System
   Brand: Sunset Gold (#FF8A66 → #F5B042)
   ============================================ */

:root {
  --bg-primary: #0D1117;
  --bg-secondary: #161B22;
  --bg-tertiary: #21262D;
  --border: #30363D;
  --text-primary: #FFFFFF;
  --text-secondary: #8B949E;
  --text-tertiary: #6E7681;
  --brand-start: #FF8A66;
  --brand-end: #F5B042;
  --positive: #4F8A5B;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ── Typography ── */
.gradient-text {
  background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Buttons ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
  color: #111;
  font-weight: 700;
  font-size: 15px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.15s;
  white-space: nowrap;
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 15px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.2s, transform 0.15s;
  white-space: nowrap;
}
.btn-secondary:hover { border-color: var(--brand-start); transform: translateY(-1px); }

/* ── Navigation ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.nav-logo-text {
  font-size: 20px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text-primary); }

.nav-cta { display: flex; align-items: center; gap: 12px; }

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all 0.3s;
}

.mobile-menu {
  display: none;
  position: fixed;
  inset: 64px 0 0 0;
  background: var(--bg-primary);
  z-index: 99;
  padding: 32px 24px;
  flex-direction: column;
  gap: 24px;
  border-top: 1px solid var(--border);
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 18px;
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

/* ── Section layout ── */
.section {
  padding: 80px 24px;
}
.section-alt { background: var(--bg-secondary); }

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand-start);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.section-sub {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 560px;
}
.centered { text-align: center; margin-left: auto; margin-right: auto; }
.centered .section-sub { margin-left: auto; margin-right: auto; }

/* ── Cards ── */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(255,138,102,0.15), rgba(245,176,66,0.15));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 20px;
}
.card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ── Grid ── */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

/* ── Footer ── */
footer {
  background: #0A0A0A;
  border-top: 1px solid var(--border);
  padding: 60px 24px 32px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}
.footer-brand p {
  font-size: 14px;
  color: var(--text-tertiary);
  line-height: 1.6;
  margin-top: 12px;
  max-width: 220px;
}
.footer-col h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.footer-col a {
  display: block;
  font-size: 13px;
  color: var(--text-tertiary);
  text-decoration: none;
  margin-bottom: 10px;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--text-secondary); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: 12px; color: var(--text-tertiary); }
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a { font-size: 12px; color: var(--text-tertiary); text-decoration: none; }
.footer-bottom-links a:hover { color: var(--text-secondary); }

/* ── Page hero (for inner pages) ── */
.page-hero {
  padding: 60px 24px;
  border-bottom: 1px solid var(--border);
}
.page-hero h1 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  margin-bottom: 8px;
}
.page-hero p { color: var(--text-secondary); font-size: 15px; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .nav-links, .nav-cta .btn-secondary { display: none; }
  .nav-hamburger { display: flex; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .section { padding: 60px 20px; }
  .btn-primary, .btn-secondary { padding: 12px 20px; font-size: 14px; }
}

@media (max-width: 480px) {
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}