/* ===== CSS Variables ===== */
:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-light: #818cf8;
  --accent: #06b6d4;
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --surface: #1e293b;
  --surface-2: #334155;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --border: #334155;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.3), 0 2px 4px -2px rgba(0,0,0,0.2);
  --shadow-lg: 0 10px 30px -5px rgba(0,0,0,0.4);
  --transition: 0.2s ease;
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent); }
ul { list-style: none; }

/* ===== Container ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Navbar ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}
.nav-content {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 1.4rem; font-weight: 700; color: var(--text);
}
.logo-icon { font-size: 1.6rem; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { color: var(--text-muted); font-size: 0.9rem; font-weight: 500; }
.nav-links a:hover { color: var(--text); }
.menu-toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.menu-toggle span {
  width: 24px; height: 2px; background: var(--text);
  transition: var(--transition);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-size: 0.9rem; font-weight: 600; cursor: pointer;
  border: none; transition: all var(--transition);
  text-decoration: none;
}
.btn-primary {
  background: var(--primary); color: white;
}
.btn-primary:hover { background: var(--primary-dark); color: white; transform: translateY(-1px); }
.btn-outline {
  background: transparent; color: var(--text);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--primary-light); color: var(--primary-light); }
.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { color: var(--text); }
.btn-lg { padding: 14px 28px; font-size: 1rem; border-radius: var(--radius); }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ===== Hero ===== */
.hero {
  position: relative; padding: 160px 0 100px; overflow: hidden;
  min-height: 90vh; display: flex; align-items: center;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(79,70,229,0.25), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(6,182,212,0.12), transparent);
}
.hero-content { position: relative; text-align: center; max-width: 800px; margin: 0 auto; }
.hero-badge {
  display: inline-block; padding: 6px 16px;
  background: rgba(79,70,229,0.15); border: 1px solid rgba(79,70,229,0.3);
  border-radius: 100px; font-size: 0.8rem; font-weight: 600;
  color: var(--primary-light); margin-bottom: 24px;
  letter-spacing: 0.5px;
}
.hero h1 {
  font-size: 4rem; font-weight: 800; line-height: 1.1;
  letter-spacing: -0.03em; margin-bottom: 24px;
}
.gradient-text {
  background: linear-gradient(135deg, var(--primary-light), var(--accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.2rem; color: var(--text-muted);
  max-width: 600px; margin: 0 auto 40px; line-height: 1.7;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; margin-bottom: 60px; }
.hero-stats {
  display: flex; justify-content: center; gap: 48px;
  padding-top: 40px; border-top: 1px solid var(--border);
}
.stat { text-align: center; }
.stat-value { display: block; font-size: 1.8rem; font-weight: 800; color: var(--text); }
.stat-label { font-size: 0.8rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 1px; }

/* ===== Sections ===== */
.section-header { text-align: center; max-width: 600px; margin: 0 auto 60px; }
.section-header h2 { font-size: 2.5rem; font-weight: 800; margin-bottom: 16px; letter-spacing: -0.02em; }
.section-header p { color: var(--text-muted); font-size: 1.1rem; }

/* ===== Features ===== */
.features { padding: 120px 0; }
.features-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
  cursor: pointer; transition: all var(--transition);
  position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.3s ease;
}
.feature-card:hover {
  border-color: var(--primary); background: var(--bg-card-hover);
  transform: translateY(-4px); box-shadow: var(--shadow-lg);
}
.feature-card:hover::before { transform: scaleX(1); }
.feature-icon { font-size: 2.5rem; margin-bottom: 16px; }
.feature-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 16px; line-height: 1.6; }
.feature-endpoints {
  display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px;
}
.feature-endpoints code {
  font-family: var(--font-mono); font-size: 0.72rem;
  padding: 3px 8px; background: rgba(79,70,229,0.1);
  border: 1px solid rgba(79,70,229,0.2); border-radius: 4px;
  color: var(--primary-light);
}
.feature-link {
  font-size: 0.85rem; font-weight: 600; color: var(--primary-light);
  transition: color var(--transition);
}
.feature-card:hover .feature-link { color: var(--accent); }
.feature-card-ai {
  grid-column: span 3;
  background: linear-gradient(135deg, rgba(79,70,229,0.1), rgba(6,182,212,0.1));
  border-color: rgba(79,70,229,0.3);
}

/* ===== API Explorer ===== */
.api-explorer { padding: 120px 0; background: var(--surface); }
.explorer-layout { display: grid; grid-template-columns: 280px 1fr; gap: 24px; }
.explorer-sidebar {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px; max-height: 600px;
  overflow-y: auto; display: flex; flex-direction: column; gap: 4px;
}
.explorer-group { margin-bottom: 16px; }
.explorer-group h4 {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 1.5px;
  color: var(--text-dim); margin-bottom: 8px; padding: 0 8px;
}
.explorer-btn {
  display: flex; align-items: center; gap: 10px;
  width: 100%; padding: 8px 12px; background: transparent;
  border: 1px solid transparent; border-radius: var(--radius-sm);
  color: var(--text-muted); font-size: 0.82rem; cursor: pointer;
  transition: all var(--transition); text-align: left;
  font-family: var(--font);
}
.explorer-btn:hover { background: var(--surface-2); color: var(--text); }
.explorer-btn.active { background: var(--primary); color: white; border-color: var(--primary); }
.method {
  font-size: 0.65rem; font-weight: 700; padding: 2px 6px;
  border-radius: 3px; font-family: var(--font-mono);
  min-width: 36px; text-align: center;
}
.method.get { background: rgba(34,197,94,0.15); color: var(--success); }
.method.post { background: rgba(79,70,229,0.15); color: var(--primary-light); }
.method.put { background: rgba(245,158,11,0.15); color: var(--warning); }
.method.delete { background: rgba(239,68,68,0.15); color: var(--danger); }
.explorer-auth-status {
  margin-top: auto; padding: 12px;
  background: var(--surface-2); border-radius: var(--radius-sm);
  font-size: 0.8rem; color: var(--text-muted);
  display: flex; align-items: center; gap: 8px;
}
.auth-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--danger);
}
.auth-dot.connected { background: var(--success); }

.explorer-main { display: flex; flex-direction: column; gap: 16px; }
.explorer-request {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
}
.request-header {
  display: flex; align-items: center; gap: 12px;
  padding: 16px; border-bottom: 1px solid var(--border);
}
.method-badge {
  font-size: 0.75rem; font-weight: 700; padding: 4px 10px;
  border-radius: 4px; font-family: var(--font-mono);
  background: rgba(34,197,94,0.15); color: var(--success);
}
.method-badge.post { background: rgba(79,70,229,0.15); color: var(--primary-light); }
.request-url {
  flex: 1; font-family: var(--font-mono); font-size: 0.9rem;
  color: var(--text); overflow-x: auto; white-space: nowrap;
}
.request-body-container { padding: 16px; }
.request-body-container label {
  display: block; font-size: 0.8rem; color: var(--text-dim);
  margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px;
}
.code-editor {
  width: 100%; padding: 12px; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); font-family: var(--font-mono); font-size: 0.85rem;
  resize: vertical; line-height: 1.5;
}
.code-editor:focus { outline: none; border-color: var(--primary); }
.explorer-response {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; flex: 1;
}
.response-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 16px; border-bottom: 1px solid var(--border);
  font-size: 0.85rem; font-weight: 600;
}
.response-status { font-family: var(--font-mono); font-size: 0.8rem; }
.response-status.ok { color: var(--success); }
.response-status.error { color: var(--danger); }
.response-body {
  padding: 16px; font-family: var(--font-mono); font-size: 0.82rem;
  color: var(--text-muted); max-height: 400px; overflow-y: auto;
  white-space: pre-wrap; word-break: break-word; line-height: 1.5;
  margin: 0;
}

/* ===== Pricing ===== */
.pricing { padding: 120px 0; }
.pricing-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px; align-items: start;
}
.pricing-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 40px 32px;
  text-align: center; position: relative; transition: all var(--transition);
}
.pricing-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.pricing-card.featured {
  border-color: var(--primary);
  background: linear-gradient(to bottom, rgba(79,70,229,0.08), var(--bg-card));
  transform: scale(1.05);
}
.pricing-card.featured:hover { transform: scale(1.05) translateY(-4px); }
.pricing-badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  padding: 4px 16px; background: var(--primary); color: white;
  border-radius: 100px; font-size: 0.75rem; font-weight: 700;
  white-space: nowrap;
}
.pricing-card h3 { font-size: 1.3rem; margin-bottom: 16px; }
.price { font-size: 3rem; font-weight: 800; margin-bottom: 4px; }
.price span { font-size: 1rem; font-weight: 400; color: var(--text-muted); }
.price-desc { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 32px; }
.pricing-card ul { text-align: left; margin-bottom: 32px; }
.pricing-card li {
  padding: 8px 0; font-size: 0.9rem; color: var(--text-muted);
  border-bottom: 1px solid rgba(51,65,85,0.5);
}
.pricing-card li::before {
  content: '\2713'; color: var(--success); font-weight: 700;
  margin-right: 10px;
}

/* ===== Footer ===== */
.footer {
  padding: 80px 0 40px; border-top: 1px solid var(--border);
  background: var(--bg);
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px; margin-bottom: 48px;
}
.footer-brand p { color: var(--text-muted); font-size: 0.9rem; margin-top: 12px; line-height: 1.6; }
.footer-links h4 {
  font-size: 0.8rem; text-transform: uppercase; letter-spacing: 1px;
  color: var(--text-dim); margin-bottom: 16px;
}
.footer-links a {
  display: block; padding: 4px 0; color: var(--text-muted);
  font-size: 0.9rem; transition: color var(--transition);
}
.footer-links a:hover { color: var(--text); }
.footer-bottom {
  padding-top: 32px; border-top: 1px solid var(--border);
  text-align: center; color: var(--text-dim); font-size: 0.85rem;
}

/* ===== Modals ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px); z-index: 2000;
  display: none; align-items: center; justify-content: center;
  padding: 24px;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 40px;
  max-width: 440px; width: 100%; position: relative;
  animation: modalIn 0.2s ease;
}
.modal-lg { max-width: 700px; max-height: 85vh; overflow-y: auto; }
@keyframes modalIn {
  from { opacity: 0; transform: translateY(16px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.modal-close {
  position: absolute; top: 16px; right: 16px;
  background: none; border: none; color: var(--text-dim);
  font-size: 1.8rem; cursor: pointer; line-height: 1;
  transition: color var(--transition);
}
.modal-close:hover { color: var(--text); }
.modal h2 { font-size: 1.5rem; margin-bottom: 8px; }
.modal > p { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 28px; }
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block; font-size: 0.85rem; font-weight: 600;
  margin-bottom: 6px; color: var(--text);
}
.form-group input, .form-group select {
  width: 100%; padding: 10px 14px; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  color: var(--text); font-size: 0.9rem; font-family: var(--font);
  transition: border-color var(--transition);
}
.form-group input:focus, .form-group select:focus {
  outline: none; border-color: var(--primary);
}
.form-group select { cursor: pointer; }
.form-group select option { background: var(--bg-card); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-message {
  margin-top: 16px; padding: 10px 14px; border-radius: var(--radius-sm);
  font-size: 0.85rem; display: none;
}
.form-message.success { display: block; background: rgba(34,197,94,0.1); color: var(--success); border: 1px solid rgba(34,197,94,0.2); }
.form-message.error { display: block; background: rgba(239,68,68,0.1); color: var(--danger); border: 1px solid rgba(239,68,68,0.2); }
.modal-switch {
  text-align: center; margin-top: 20px; font-size: 0.85rem; color: var(--text-muted);
}

/* ===== Feature Detail Modal ===== */
.feature-detail h2 { margin-bottom: 12px; }
.feature-detail p.desc { color: var(--text-muted); margin-bottom: 24px; font-size: 0.95rem; }
.endpoint-list { display: flex; flex-direction: column; gap: 10px; }
.endpoint-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; background: var(--surface-2);
  border-radius: var(--radius-sm); cursor: pointer;
  transition: all var(--transition); border: 1px solid transparent;
}
.endpoint-item:hover {
  border-color: var(--primary); background: rgba(79,70,229,0.1);
}
.endpoint-item .method {
  font-size: 0.7rem; min-width: 48px;
}
.endpoint-item .path {
  font-family: var(--font-mono); font-size: 0.85rem; flex: 1;
}
.endpoint-item .arrow { color: var(--text-dim); font-size: 0.9rem; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-card-ai { grid-column: span 2; }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .pricing-card.featured { transform: scale(1); }
  .pricing-card.featured:hover { transform: translateY(-4px); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}
@media (max-width: 768px) {
  .hero h1 { font-size: 2.5rem; }
  .hero-subtitle { font-size: 1rem; }
  .hero-stats { flex-wrap: wrap; gap: 24px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .features-grid { grid-template-columns: 1fr; }
  .feature-card-ai { grid-column: span 1; }
  .section-header h2 { font-size: 1.8rem; }
  .explorer-layout { grid-template-columns: 1fr; }
  .explorer-sidebar { max-height: 300px; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: var(--bg); flex-direction: column; padding: 24px;
    border-bottom: 1px solid var(--border); gap: 16px;
  }
  .nav-links.open { display: flex; }
  .menu-toggle { display: flex; }
  .modal { padding: 28px; }
  .form-row { grid-template-columns: 1fr; }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--surface-2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }