/* ═══════════════════ DESIGN TOKENS — Demo B: Gradient SaaS ═══════════════════ */
:root {
  --bg-root: #f8fafc;
  --bg-surface: #ffffff;
  --bg-elevated: #f1f5f9;
  --accent-500: #6366f1;
  --accent-600: #4f46e5;
  --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --success: #10b981;
  --success-bg: #ecfdf5;
  --border-default: #e2e8f0;
  --border-strong: #cbd5e1;
  --border-accent: rgba(99,102,241,0.2);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', sans-serif;

  --text-xs: 14px;
  --text-sm: 15px;
  --text-base: 18px;
  --text-lg: 22px;
  --text-xl: 28px;
  --text-2xl: 36px;
  --text-3xl: 48px;
  --text-4xl: 56px;
  --text-5xl: 64px;

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Text', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
}

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg-root);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-lg); /* --text-base */
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}


.lang-selector{position:relative;margin-left:8px}
.lang-current{display:flex;align-items:center;gap:4px;padding:6px 10px;background:var(--bg-elevated);border:1px solid var(--border-default);border-radius:var(--radius-sm);font-size:var(--text-sm);font-weight:500;color:var(--text-secondary);cursor:pointer;font-family:var(--font-body);transition:all 150ms}
.lang-current:hover{border-color:var(--border-strong);color:var(--text-primary)}
.lang-current::after{content:'';display:inline-block;width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid var(--text-muted);margin-left:2px}
.lang-dropdown{display:none;position:absolute;top:calc(100% + 4px);right:0;background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);min-width:120px;z-index:1001;overflow:hidden}
.lang-dropdown.open{display:block}
.lang-dropdown a{display:block;padding:8px 14px;font-size:var(--text-sm);color:var(--text-secondary);text-decoration:none;transition:background 100ms;font-family:var(--font-body)}
.lang-dropdown a:hover{background:var(--bg-elevated);color:var(--text-primary)}
.lang-dropdown a.active{background:var(--accent-500);color:#fff}

/* ═══════════════════ NAV ═══════════════════ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-default);
}
.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}
.nav-logo span { background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-links { display: flex; align-items: center; gap: 24px; }
.nav-links a {
  font-size: var(--text-lg); /* --text-base */ font-weight: 500;
  color: var(--text-secondary); text-decoration: none;
  transition: color 150ms;
}
.nav-links a:hover { color: var(--text-primary); }

/* ═══════════════════ SECTIONS ═══════════════════ */
.section { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ═══════════════════ HERO ═══════════════════ */
.hero {
  padding: 140px 0 80px;
  text-align: center;
}
.hero-label {
  font-size: 15px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--accent-500); margin-bottom: 20px;
}
.hero-title {
  font-family: var(--font-display);
  font-size: var(--text-4xl); font-weight: 800;
  letter-spacing: -0.02em; line-height: 1.12;
  max-width: 680px; margin: 0 auto 16px;
}
.hero-title span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: var(--text-lg); color: var(--text-secondary);
  max-width: 500px; margin: 0 auto 24px;
  line-height: 1.6;
}
.hero-pain-points {
  display: flex; gap: 24px; justify-content: center;
  font-size: var(--text-lg); /* --text-base */ color: var(--text-muted); margin-bottom: 36px;
}
.hero-pain-points span {
  display: flex; align-items: center; gap: 6px;
}
.hero-pain-points span::before {
  content: ""; display: block;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent-gradient);
}

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 56px; padding: 0 36px;
  border-radius: var(--radius-md);
  font-family: var(--font-body); font-size: var(--text-lg); font-weight: 600;
  border: none; cursor: pointer;
  transition: all 150ms ease-out; text-decoration: none;
}
.btn-primary {
  background: var(--accent-gradient); color: #fff;
  box-shadow: 0 2px 8px rgba(99,102,241,0.25);
}
.btn-primary:hover {
  box-shadow: 0 6px 20px rgba(99,102,241,0.35);
  transform: translateY(-1px);
}
.btn-secondary {
  background: var(--bg-surface); color: var(--text-primary);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover { border-color: var(--border-accent); background: var(--bg-elevated); }
.btn-sm { height: 48px; padding: 0 24px; font-size: var(--text-lg); /* --text-base */ }

/* ═══════════════════ PRICING (Hero) ═══════════════════ */
.pricing {
  padding: 0 0 80px;
}
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.pricing-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 250ms, border-color 250ms, transform 250ms;
}
.pricing-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-accent);
}
.pricing-card.featured {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-lg);
  transform: scale(1.02);
}
.pricing-card.featured:hover { box-shadow: 0 12px 32px rgba(99,102,241,0.12); }

.pricing-badge { margin-bottom: 12px; }
.pricing-badge span {
  display: inline-flex; align-items: center;
  height: 24px; padding: 0 10px;
  border-radius: 20px;
  font-size: 15px; font-weight: 600;
  background: rgba(99,102,241,0.08); color: var(--accent-600);
}
.pricing-name { font-weight: 700; font-size: var(--text-lg); margin-bottom: 4px; }
.pricing-desc { font-size: var(--text-lg); /* --text-base */ color: var(--text-muted); margin-bottom: 20px; }
.pricing-price {
  font-family: var(--font-display);
  font-size: 44px; font-weight: 800;
  letter-spacing: -0.02em; margin-bottom: 4px;
}
.pricing-price span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.pricing-unit { font-size: 15px; color: var(--text-muted); margin-bottom: 20px; }
.pricing-specs {
  list-style: none;
  font-size: var(--text-lg); /* --text-base */ color: var(--text-secondary);
  margin-bottom: 24px;
  display: flex; flex-direction: column; gap: 8px;
}
.pricing-specs li { line-height: 1.5; }
.pricing-cta { width: 100%; }

/* ═══════════════════ PAIN POINTS SECTION ═══════════════════ */
.why {
  padding: 80px 0;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-default);
  border-bottom: 1px solid var(--border-default);
}
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.why-card { text-align: center; }
.why-icon {
  width: 48px; height: 48px; border-radius: var(--radius-lg);
  background: rgba(99,102,241,0.06);
  display: inline-flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
  font-size: var(--text-lg);
}
.why-title { font-weight: 700; font-size: var(--text-lg); margin-bottom: 8px; }
.why-desc { font-size: var(--text-lg); /* --text-base */ color: var(--text-secondary); line-height: 1.6; }

/* ═══════════════════ SECTION HEADERS ═══════════════════ */
.section-header { text-align: center; margin-bottom: 48px; }
.section-label {
  font-size: 15px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--accent-500); margin-bottom: 12px;
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl); font-weight: 700;
  letter-spacing: -0.02em; line-height: 1.2;
  margin-bottom: 12px;
}
.section-desc { font-size: var(--text-lg); /* --text-base */ color: var(--text-secondary); max-width: 480px; margin: 0 auto; }

/* ═══════════════════ COMPARE ═══════════════════ */
.compare {
  padding: 80px 0;
}
.compare-table-wrap {
  max-width: 800px; margin: 0 auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.compare-table {
  width: 100%; border-collapse: collapse;
}
.compare-table th {
  text-align: left; padding: 16px 24px;
  border-bottom: 1px solid var(--border-default);
  font-size: 15px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: var(--text-muted); background: var(--bg-elevated);
}
.compare-table td {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-default);
  font-size: var(--text-lg); /* --text-base */
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table .us { color: var(--accent-600); font-weight: 600; }
.compare-table .better { color: var(--success); font-weight: 600; }

/* ═══════════════════ SDK ═══════════════════ */

.copy-btn{position:absolute;top:12px;right:12px;padding:6px 12px;background:rgba(255,255,255,0.08);border:1px solid rgba(255,255,255,0.12);border-radius:6px;color:rgba(255,255,255,0.5);font-size:13px;cursor:pointer;transition:all 150ms;font-family:var(--font-body);line-height:1}
.copy-btn:hover{background:rgba(255,255,255,0.14);color:rgba(255,255,255,0.85)}
.copy-btn.copied{background:var(--success);border-color:var(--success);color:#fff}

.sdk { padding: 80px 0; }
.sdk-content { max-width: 720px; margin: 0 auto; }
.sdk-tabs {
  display: inline-flex; gap: 4px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md); padding: 4px;
  margin-bottom: 20px;
}
.sdk-tab {
  padding: 6px 16px; border-radius: var(--radius-sm);
  font-size: var(--text-lg); /* --text-base */ font-weight: 500;
  color: var(--text-secondary);
  border: none; background: none; cursor: pointer;
  transition: all 150ms; font-family: var(--font-body);
}
.sdk-tab.active {
  background: var(--bg-surface); color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}
.sdk-code {
  background: #0f172a;
  border-radius: var(--radius-xl);
  padding: 24px 28px;
  font-family: var(--font-mono);
  font-size: var(--text-lg); /* --text-base */ line-height: 1.8;
  color: #e2e8f0; overflow-x: auto;
}
.sdk-code .cm { color: #64748b; }
.sdk-code .kw { color: #818cf8; }
.sdk-code .str { color: #34d399; }
.sdk-code .fn { color: #fbbf24; }

/* ═══════════════════ FAQ ═══════════════════ */
.faq { padding: 80px 0; }
.faq-grid { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
}
.faq-q { font-weight: 600; font-size: var(--text-lg); margin-bottom: 8px; }
.faq-a { font-size: var(--text-lg); /* --text-base */ color: var(--text-secondary); line-height: 1.6; }

/* ═══════════════════ CTA BANNER ═══════════════════ */
.cta-banner {
  padding: 80px 0;
  text-align: center;
}
.cta-banner-inner {
  background: var(--bg-surface);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-lg);
  max-width: 720px; margin: 0 auto;
}
.cta-banner h3 {
  font-family: var(--font-display);
  font-size: var(--text-2xl); font-weight: 700;
  letter-spacing: -0.01em; margin-bottom: 12px;
}
.cta-banner p {
  font-size: var(--text-lg); color: var(--text-secondary);
  margin-bottom: 24px;
}

/* ═══════════════════ FOOTER ═══════════════════ */
.footer {
  background: #0f172a; color: #e2e8f0; padding: 56px 0 32px;
}
.footer-inner { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer-brand {
  font-family: var(--font-display);
  font-size: var(--text-lg); /* --text-base */ font-weight: 700;
  letter-spacing: -0.01em; margin-bottom: 8px;
}
.footer-brand span {
  background: linear-gradient(135deg, #818cf8, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-desc { font-size: var(--text-lg); /* --text-base */ color: #94a3b8; line-height: 1.6; }
.footer-col-title {
  font-size: 15px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.06em;
  color: #64748b; margin-bottom: 12px;
}
.footer-col a {
  display: block; font-size: var(--text-lg); /* --text-base */ color: #94a3b8;
  text-decoration: none; padding: 4px 0; transition: color 150ms;
}
.footer-col a:hover { color: #e2e8f0; }
.footer-bottom {
  margin-top: 40px; padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex; justify-content: space-between;
  font-size: 15px; color: #64748b;
}

/* ═══════════════════ RESPONSIVE ═══════════════════ */
@media (max-width: 900px) {
  .hero { padding: 100px 0 60px; }
  .hero-title { font-size: var(--text-2xl); }
  .hero-subtitle { font-size: var(--text-lg); /* --text-base */ }
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .pricing-card.featured { transform: none; }
  .why-grid { grid-template-columns: 1fr; }
  .compare-table th, .compare-table td { padding: 12px 16px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  .hero-title { font-size: 28px; }
  .hero-pain-points { flex-direction: column; align-items: center; gap: 12px; }
  .footer-grid { grid-template-columns: 1fr; }
  .section-title { font-size: var(--text-lg); }
  .cta-banner-inner { padding: 32px 24px; }
}

@media(max-width:900px){
.nav-links{display:none}
.nav-links.open{display:flex;flex-direction:column;position:absolute;top:56px;left:0;right:0;background:var(--bg-surface);border-bottom:1px solid var(--border-default);padding:16px 24px;gap:12px;z-index:1000}
.hamburger{display:flex;flex-direction:column;gap:4px;background:none;border:none;cursor:pointer;padding:4px}
.hamburger span{display:block;width:20px;height:2px;background:var(--text-primary);border-radius:1px;transition:all 200ms}
}