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

:root {
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-dark: #0f1724;
  --text: #111827;
  --text-secondary: #4b5563;
  --text-on-dark: #f1f5f9;
  --text-on-dark-secondary: #b0bec5;
  --accent: #2563eb;
  --accent-light: #3b82f6;
  --accent-soft: #60a5fa;
  --accent-glow: rgba(37, 99, 235, 0.08);
  --btn-gradient: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  --border: #e5e7eb;
  --border-light: #f3f4f6;
  --card-bg: #ffffff;
  --card-hover: #f9fafb;
  --radius: 16px;
  --radius-sm: 12px;
  --font: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --max-w: 1200px;
}

html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }

/* ==================== Nav ==================== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  background: rgba(15, 23, 36, 0.88);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 0 24px;
  height: 64px; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  font-size: 20px; font-weight: 700; letter-spacing: -0.02em;
  background: linear-gradient(135deg, #3b82f6, #38bdf8);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  display: flex; align-items: center; gap: 8px;
}
.nav-logo-icon { width: 28px; height: 28px; border-radius: 6px; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { font-size: 14px; color: var(--text-on-dark-secondary); transition: color 0.2s; }
.nav-links a:hover { color: #fff; text-decoration: underline; text-underline-offset: 4px; }
.nav-cta {
  background: var(--accent); color: #fff !important; padding: 8px 20px;
  border-radius: 8px; font-weight: 600; font-size: 14px; transition: all 0.2s;
}
.nav-cta:hover { background: var(--accent-light); transform: translateY(-1px); }

/* ==================== Hero ==================== */
.hero {
  position: relative; background: var(--bg-dark); overflow: hidden;
  padding: 160px 24px 120px; text-align: center; min-height: 100vh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.hero::before {
  content: ''; position: absolute; top: -40%; left: 50%; transform: translateX(-50%);
  width: 1000px; height: 1000px;
  background: radial-gradient(ellipse, rgba(37,99,235,0.15) 0%, rgba(56,189,248,0.05) 50%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(59,130,246,0.25), transparent);
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(37,99,235,0.1); border: 1px solid rgba(59,130,246,0.15);
  padding: 6px 16px; border-radius: 100px; font-size: 13px;
  color: var(--accent-soft); margin-bottom: 32px; font-weight: 500;
}
.hero-badge::before {
  content: ''; width: 6px; height: 6px; background: #22c55e;
  border-radius: 50%; animation: pulse 2s infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
.hero h1 {
  font-size: clamp(40px, 6vw, 68px); font-weight: 800; color: #fff;
  line-height: 1.1; letter-spacing: -0.03em; margin-bottom: 24px;
  max-width: 780px; margin-left: auto; margin-right: auto;
}
.hero h1 .gradient {
  background: linear-gradient(135deg, #1d4ed8 0%, #3b82f6 30%, #60a5fa 55%, #93c5fd 75%, #3b82f6 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  animation: gradientShift 6s ease infinite;
}
@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
.hero-sub {
  font-size: clamp(16px, 2vw, 19px); color: var(--text-on-dark-secondary);
  max-width: 580px; margin: 0 auto 40px; line-height: 1.7;
}
.hero-models {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 8px;
  max-width: 680px; margin: 0 auto 48px;
}
.hero-models span {
  padding: 6px 14px; border-radius: 100px; font-size: 13px; font-weight: 500;
  background: rgba(255,255,255,0.05); color: var(--text-on-dark-secondary);
  border: 1px solid rgba(255,255,255,0.08); transition: all 0.2s;
}
.hero-models span:hover {
  background: rgba(59,130,246,0.12); color: var(--accent-soft);
  border-color: rgba(59,130,246,0.25);
}
.hero-ctas { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--btn-gradient); color: #fff; padding: 14px 32px;
  border-radius: 12px; font-size: 16px; font-weight: 600;
  transition: all 0.2s; border: none; cursor: pointer;
}
.btn-primary:hover {
  background: linear-gradient(135deg, #3b82f6, #60a5fa);
  transform: translateY(-2px); box-shadow: 0 8px 32px rgba(37,99,235,0.3);
}
.btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,0.06); color: var(--text-on-dark-secondary);
  padding: 14px 32px; border-radius: 12px; font-size: 16px; font-weight: 500;
  transition: all 0.2s; border: 1px solid rgba(255,255,255,0.1); cursor: pointer;
}
.btn-secondary:hover { background: rgba(255,255,255,0.1); color: #fff; }

/* ==================== Section Common ==================== */
.section { padding: 100px 24px; max-width: var(--max-w); margin: 0 auto; }
.section-alt { background: var(--bg-alt); }
.section-alt > .section-inner { max-width: var(--max-w); margin: 0 auto; padding: 0 24px;}
.section-label {
  font-size: 13px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--accent); margin-bottom: 12px;
}
.section-title {
  font-size: clamp(28px, 4vw, 40px); font-weight: 800;
  letter-spacing: -0.02em; line-height: 1.2; margin-bottom: 12px;
}
.section-desc { font-size: 17px; color: var(--text-secondary); max-width: 560px; line-height: 1.7; }
.section-desc.centered { margin: 0 auto; }
.text-center { text-align: center; }

/* ==================== Value Props ==================== */
.values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 56px; }
.value-card {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 36px 28px; transition: all 0.3s;
  position: relative; overflow: hidden;
}
.value-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--accent); opacity: 0; transition: opacity 0.3s;
}
.value-card:hover {
  border-color: rgba(37,99,235,0.25); box-shadow: 0 4px 24px rgba(0,0,0,0.05);
  transform: translateY(-3px);
}
.value-card:hover::before { opacity: 1; }
.value-icon {
  width: 44px; height: 44px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; margin-bottom: 20px; background: var(--accent-glow);
}
.value-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.value-card p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ==================== Models Grid ==================== */
.models-section { background: var(--bg-dark); padding: 100px 24px; }
.models-section .section-title { color: #fff; }
.models-section .section-desc { color: var(--text-on-dark-secondary); }
.models-section .section-label { color: var(--accent-soft); }
.models-inner { max-width: var(--max-w); margin: 0 auto; }
.models-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 56px;
}
.model-group {
  background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius); padding: 24px 20px; transition: all 0.3s;
}
.model-group:hover {
  background: rgba(255,255,255,0.05); border-color: rgba(59,130,246,0.25);
}
.model-group-header {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 14px; padding-bottom: 14px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.model-provider-logo {
  width: 30px; height: 30px; border-radius: 7px;
  background: rgba(255,255,255,0.08); display: flex;
  align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; color: #fff;
}
.model-provider-name { font-size: 14px; font-weight: 600; color: #fff; }
.model-list { display: flex; flex-direction: column; gap: 5px; }
.model-item {
  font-size: 13px; color: var(--text-on-dark-secondary); padding: 3px 0;
  display: flex; align-items: center; gap: 6px;
}
.model-item .dot {
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--accent-soft); flex-shrink: 0;
}
.model-item.new { color: #34d399; }
.model-item.new::after {
  content: 'NEW'; font-size: 9px; font-weight: 700;
  background: rgba(52,211,153,0.12); color: #34d399;
  padding: 1px 5px; border-radius: 3px; letter-spacing: 0.05em;
}
.models-footer {
  text-align: center; margin-top: 40px;
  color: var(--text-on-dark-secondary); font-size: 14px;
}
.models-footer strong { color: var(--accent-soft); }

/* ==================== Use Cases ==================== */
.usecases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 56px; }
.usecase-card {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 28px;
  display: flex; gap: 20px; transition: all 0.3s;
}
.usecase-card:hover { box-shadow: 0 4px 24px rgba(0,0,0,0.05); transform: translateY(-2px); }
.usecase-emoji {
  font-size: 28px; flex-shrink: 0; width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent-glow); border-radius: 12px;
}
.usecase-content h3 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.usecase-content p { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ==================== Pricing ==================== */
.pricing-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 20px; margin-top: 56px;
}
.pricing-card {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 24px;
  transition: all 0.3s; position: relative; display: flex; flex-direction: column;
}
.pricing-card:hover { box-shadow: 0 4px 24px rgba(0,0,0,0.06); transform: translateY(-3px); }
.pricing-card.popular {
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 8px 32px rgba(37,99,235,0.1);
}
.pricing-card.ultimate { border-color: #ca8a04; }
.pricing-badge {
  position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
  background: var(--accent); color: #fff; font-size: 11px; font-weight: 700;
  padding: 3px 14px; border-radius: 100px; white-space: nowrap;
}
.pricing-header { margin-bottom: 24px; }
.pricing-header h3 { font-size: 18px; font-weight: 700; margin-bottom: 2px; }
.pricing-tagline { font-size: 13px; color: var(--text-secondary); margin-bottom: 16px; }
.pricing-price {
  font-size: 44px; font-weight: 800; letter-spacing: -0.03em;
  line-height: 1; margin-bottom: 8px;
}
.pricing-price .currency {
  font-size: 22px; font-weight: 600; vertical-align: top;
  margin-right: 2px; position: relative; top: 6px;
}
.pricing-price .period { font-size: 15px; font-weight: 500; color: var(--text-secondary); }
.pricing-credits {
  font-size: 13px; font-weight: 600; color: var(--accent);
  background: var(--accent-glow); display: inline-block;
  padding: 3px 10px; border-radius: 6px;
}
.pricing-card.ultimate .pricing-credits { color: #ca8a04; background: rgba(202,138,4,0.08); }
.pricing-features {
  list-style: none; display: flex; flex-direction: column;
  gap: 10px; margin-bottom: 28px; flex-grow: 1;
}
.pricing-features li {
  font-size: 13px; color: var(--text-secondary);
  padding-left: 22px; position: relative; line-height: 1.5;
}
.pricing-features li::before {
  content: '✓'; position: absolute; left: 0;
  color: #22c55e; font-weight: 700; font-size: 13px;
}
.pricing-features li strong { color: var(--accent); font-weight: 600; }
.pricing-card.ultimate .pricing-features li strong { color: #ca8a04; }
.pricing-btn {
  display: block; text-align: center; padding: 11px 20px;
  border-radius: 10px; font-size: 14px; font-weight: 600;
  border: 1px solid var(--border); color: var(--text);
  transition: all 0.2s; background: var(--card-bg);
}
.pricing-btn:hover { background: var(--card-hover); border-color: #d1d5db; }
.pricing-btn-primary {
  background: var(--accent); color: #fff; border-color: var(--accent);
}
.pricing-btn-primary:hover { background: var(--accent-light); border-color: var(--accent-light); }
.pricing-btn-gold {
  background: linear-gradient(135deg, #ca8a04, #a16207);
  color: #fff; border-color: #ca8a04;
}
.pricing-btn-gold:hover {
  background: linear-gradient(135deg, #a16207, #854d0e);
  border-color: #a16207;
}
.pricing-note { margin-top: 32px; font-size: 13px; color: var(--text-secondary); }

/* ==================== API Section ==================== */
.api-section { background: var(--bg-alt); padding: 100px 24px; }
.api-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center;
}
.api-code {
  background: var(--bg-dark); border-radius: var(--radius); padding: 28px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: 13px; line-height: 1.8; overflow-x: auto;
  border: 1px solid rgba(255,255,255,0.06);
  box-shadow: 0 16px 48px rgba(0,0,0,0.2);
}
.api-code .comment { color: #9da2ab; }
.api-code .keyword { color: #60a5fa; }
.api-code .string { color: #34d399; }
.api-code .func { color: #60a5fa; }
.api-code .prop { color: #93c5fd; }
.api-code .var { color: #fbbf24; }
.api-code .plain { color: #d1d5db; }
.api-features { display: flex; flex-direction: column; gap: 20px; margin-top: 36px; }
.api-feature { display: flex; align-items: flex-start; gap: 14px; }
.api-feature-icon {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--accent-glow); display: flex;
  align-items: center; justify-content: center;
  font-size: 15px; flex-shrink: 0; margin-top: 2px;
}
.api-feature-text h4 { font-size: 14px; font-weight: 600; margin-bottom: 2px; }
.api-feature-text p { font-size: 13px; color: var(--text-secondary); }

/* ==================== FAQ ==================== */
.faq-list {
  max-width: 680px; margin: 48px auto 0;
  display: flex; flex-direction: column; gap: 10px;
}
.faq-item {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: var(--radius-sm); overflow: hidden; transition: border-color 0.2s;
}
.faq-item:hover { border-color: #d1d5db; }
.faq-item.open { border-color: rgba(37,99,235,0.3); }
.faq-question {
  width: 100%; display: flex; align-items: center;
  justify-content: space-between; padding: 18px 20px;
  background: none; border: none; cursor: pointer;
  font-family: var(--font); font-size: 15px; font-weight: 600;
  color: var(--text); text-align: left; gap: 16px;
}
.faq-question:hover { color: var(--accent); }
.faq-chevron {
  flex-shrink: 0; transition: transform 0.2s; color: var(--text-secondary);
}
.faq-item.open .faq-chevron { transform: rotate(180deg); }
.faq-answer {
  max-height: 0; overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 20px; font-size: 14px; color: var(--text-secondary); line-height: 1.7;
}
.faq-item.open .faq-answer { max-height: 200px; padding: 0 20px 18px; }

/* ==================== CTA Section ==================== */
.cta-section {
  background: var(--bg-dark); padding: 100px 24px;
  text-align: center; position: relative; overflow: hidden;
}
.cta-section::before {
  content: ''; position: absolute; bottom: -200px; left: 50%;
  transform: translateX(-50%); width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(37,99,235,0.08) 0%, transparent 70%);
  pointer-events: none;
}
.cta-section h2 {
  font-size: clamp(28px, 4vw, 42px); font-weight: 800;
  color: #fff; letter-spacing: -0.02em; margin-bottom: 12px;
}
.cta-section p { font-size: 17px; color: var(--text-on-dark-secondary); margin-bottom: 36px; }

/* ==================== Footer ==================== */
.footer {
  background: var(--bg-dark);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 40px 24px;
}
.footer-inner {
  max-width: var(--max-w); margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
}
.footer-left { font-size: 13px; color: var(--text-on-dark-secondary); }
.footer-links { display: flex; gap: 24px; }
.footer-links a { font-size: 13px; color: var(--text-on-dark-secondary); transition: color 0.2s; text-decoration: underline; text-underline-offset: 2px; }
.footer-links a:hover { color: #fff; }

/* ==================== API Pricing Grid ==================== */
.api-pricing-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
}
.api-pack-card {
  padding: 24px 16px;
}

/* ==================== Responsive ==================== */
@media (max-width: 900px) {
  .values-grid { grid-template-columns: 1fr; }
  .models-grid { grid-template-columns: repeat(2, 1fr); }
  .usecases-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .api-pricing-grid { grid-template-columns: repeat(3, 1fr); }
  .api-inner { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .hero { padding: 120px 24px 80px; }
  .section { padding: 72px 24px; }
}
@media (max-width: 600px) {
  .models-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .api-pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { flex-direction: column; gap: 20px; text-align: center; }
}

/* ==================== Animations ==================== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate { opacity: 0; animation: fadeUp 0.6s ease-out forwards; }
.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }