/* ── Reset & Base ─────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:#1a1a2e;background:#fff;line-height:1.7;overflow-x:hidden}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}

/* ── Nav ─────────────────────────────────────────────── */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;backdrop-filter:blur(16px);background:rgba(255,255,255,.82);border-bottom:1px solid rgba(0,0,0,.06);transition:box-shadow .3s}
.nav.scrolled{box-shadow:0 2px 20px rgba(0,0,0,.08)}
.nav-inner{max-width:1100px;margin:0 auto;padding:0 24px;display:flex;align-items:center;height:64px}
.nav-logo{font-size:18px;font-weight:800;display:flex;align-items:center;gap:8px}
.nav-logo span{background:linear-gradient(135deg,#e63946,#ff6b35);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.nav-links{margin-left:auto;display:flex;gap:28px;align-items:center}
.nav-links a{font-size:14px;font-weight:500;color:#555;transition:color .2s}
.nav-links a:hover{color:#e63946}
.nav-cta{background:linear-gradient(135deg,#e63946,#ff6b35);color:#fff !important;padding:8px 20px;border-radius:8px;font-weight:600;font-size:13px}
.nav-cta:hover{opacity:.9}

/* ── Hero ────────────────────────────────────────────── */
.hero{min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:100px 24px 60px;background:linear-gradient(160deg,#fdf2f0 0%,#fff 40%,#f0f4ff 100%)}
.hero-content{max-width:720px}
.hero-badge{display:inline-flex;align-items:center;gap:6px;background:rgba(230,57,70,.08);color:#e63946;padding:6px 16px;border-radius:20px;font-size:13px;font-weight:600;margin-bottom:24px}
.hero h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;line-height:1.25;margin-bottom:16px}
.hero h1 em{font-style:normal;background:linear-gradient(135deg,#e63946,#ff6b35);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero p{font-size:1.1rem;color:#555;max-width:540px;margin:0 auto 32px}
.hero-buttons{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn-primary{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,#e63946,#ff6b35);color:#fff;padding:14px 32px;border-radius:12px;font-size:16px;font-weight:700;transition:transform .2s,box-shadow .2s;box-shadow:0 4px 20px rgba(230,57,70,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(230,57,70,.4)}
.btn-secondary{display:inline-flex;align-items:center;gap:8px;background:#fff;color:#333;padding:14px 32px;border-radius:12px;font-size:16px;font-weight:600;border:1.5px solid #ddd;transition:border-color .2s}
.btn-secondary:hover{border-color:#e63946;color:#e63946}

/* ── Stats Banner ────────────────────────────────────── */
.stats{background:#1a1a2e;padding:48px 24px}
.stats-inner{max-width:900px;margin:0 auto;display:grid;grid-template-columns:repeat(3,1fr);gap:24px;text-align:center}
.stat-item h3{font-size:clamp(1.8rem,4vw,2.8rem);font-weight:800;color:#fff}
.stat-item h3 .counter{color:#ff6b35}
.stat-item p{font-size:14px;color:rgba(255,255,255,.6);margin-top:4px}

/* ── Section common ──────────────────────────────────── */
.section{padding:80px 24px}
.section-title{text-align:center;margin-bottom:48px}
.section-title h2{font-size:clamp(1.5rem,3vw,2.2rem);font-weight:800}
.section-title p{color:#777;margin-top:8px;font-size:1rem}

/* ── AI Models ───────────────────────────────────────── */
.models-grid{max-width:1000px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.model-card{background:#fff;border:1px solid #eee;border-radius:16px;padding:32px 24px;text-align:center;transition:transform .25s,box-shadow .25s}
.model-card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(0,0,0,.08)}
.model-icon{width:60px;height:60px;border-radius:16px;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;font-size:28px;color:#fff}
.model-icon.gpt{background:linear-gradient(135deg,#10a37f,#0d8c6d)}
.model-icon.claude{background:linear-gradient(135deg,#7c3aed,#a855f7)}
.model-icon.gemini{background:linear-gradient(135deg,#4285f4,#34a853)}
.model-card h3{font-size:1.2rem;font-weight:700;margin-bottom:6px}
.model-card .model-id{font-size:12px;color:#999;font-family:monospace;margin-bottom:12px}
.model-card p{font-size:14px;color:#666;line-height:1.6}

/* ── Features ────────────────────────────────────────── */
.features-grid{max-width:1000px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.feature-card{background:#f8f9fc;border-radius:14px;padding:28px 22px;transition:background .2s}
.feature-card:hover{background:#f0f2fa}
.feature-card .icon{font-size:32px;margin-bottom:12px}
.feature-card h3{font-size:1rem;font-weight:700;margin-bottom:6px}
.feature-card p{font-size:14px;color:#666;line-height:1.6}

/* ── Pricing ─────────────────────────────────────────── */
.pricing{background:#f8f9fc}
.pricing-grid{max-width:1000px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.price-card{background:#fff;border:1.5px solid #eee;border-radius:16px;padding:32px 24px;text-align:center;position:relative;transition:transform .25s,box-shadow .25s}
.price-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(0,0,0,.06)}
.price-card.popular{border-color:#ff6b35}
.price-card .badge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:linear-gradient(135deg,#ff6b35,#e63946);color:#fff;padding:4px 16px;border-radius:12px;font-size:12px;font-weight:700}
.price-card h3{font-size:1.3rem;font-weight:700;margin-bottom:4px}
.price-card .price{font-size:2.4rem;font-weight:800;margin:16px 0 4px}
.price-card .price span{font-size:14px;font-weight:400;color:#999}
.price-card .yearly{font-size:13px;color:#999;margin-bottom:20px}
.price-card ul{list-style:none;text-align:left;margin-bottom:24px}
.price-card ul li{font-size:14px;padding:6px 0;display:flex;align-items:center;gap:8px}
.price-card ul li::before{content:"✓";color:#22c55e;font-weight:700;font-size:14px}
.price-card ul li.disabled{color:#bbb}
.price-card ul li.disabled::before{content:"—";color:#ddd}
.price-btn{display:block;width:100%;padding:12px;border-radius:10px;font-size:15px;font-weight:700;border:none;cursor:pointer;transition:opacity .2s}
.price-btn.primary{background:linear-gradient(135deg,#e63946,#ff6b35);color:#fff}
.price-btn.outline{background:#fff;color:#333;border:1.5px solid #ddd}

/* ── CTA ─────────────────────────────────────────────── */
.cta{background:linear-gradient(135deg,#1a1a2e,#16213e);padding:80px 24px;text-align:center;color:#fff}
.cta h2{font-size:clamp(1.5rem,3vw,2rem);font-weight:800;margin-bottom:12px}
.cta p{color:rgba(255,255,255,.65);margin-bottom:32px;font-size:1rem}

/* ── Footer ──────────────────────────────────────────── */
.footer{background:#111;color:rgba(255,255,255,.5);text-align:center;padding:32px 24px;font-size:13px}
.footer a{color:rgba(255,255,255,.6);margin:0 8px}
.footer a:hover{color:#fff}
.footer .links{margin-bottom:12px}

/* ── Responsive ──────────────────────────────────────── */
@media(max-width:768px){
  .nav-links a:not(.nav-cta){display:none}
  .stats-inner{grid-template-columns:1fr;gap:16px}
  .hero{padding:100px 20px 40px}
  .hero h1{font-size:1.8rem}
}