/* ========== Reset & Base ========== */
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.6;color:#0f172a;background:#f8fafc}
img{max-width:100%;height:auto}
a{color:#0ea5e9;text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1100px;margin:auto;padding:16px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ========== Header ========== */
.site-header{position:sticky;top:0;background:#ffffffcc;backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid #e2e8f0;z-index:20}
.site-header .container{display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:flex;align-items:center;gap:10px}
.brand-title{font-weight:800;font-size:1.1rem}
.nav{display:flex;gap:18px;list-style:none;margin:0;padding:0}
.nav a{padding:10px 12px;border-radius:10px}
.nav a:hover{background:#eff6ff}

/* ========== Hero ========== */
.hero{background:radial-gradient(80% 50% at 50% 0%, #e0f2fe 0%, #ffffff 60%);padding:60px 0}
.hero h1{font-size:clamp(1.8rem,3.5vw,2.6rem);margin:0 0 10px}
.hero p{max-width:60ch;margin:0 0 18px}
.search{display:flex;gap:8px;max-width:520px}
.search input{flex:1;padding:12px 14px;border:1px solid #cbd5e1;border-radius:12px}
.search button{padding:12px 16px;border:0;border-radius:12px;background:#0ea5e9;color:#fff;font-weight:700;cursor:pointer}
.search button:hover{filter:brightness(0.95)}

/* ========== Sections ========== */
section{padding:48px 0}
.grid-3{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:0;padding:0}
.card{border:1px solid #e2e8f0;border-radius:16px;padding:16px;background:#fff;box-shadow:0 4px 10px rgba(2,8,23,.03)}
.btn{display:inline-block;padding:10px 14px;border:1px solid #0ea5e9;border-radius:12px}
.btn.primary{background:#0ea5e9;color:#fff;border-color:#0ea5e9}

/* Keyword cloud */
.cloud{display:flex;flex-wrap:wrap;gap:10px;list-style:none;padding:0;margin:12px 0 0}
.cloud li{padding:.35rem .7rem;border-radius:999px;background:#f1f5f9;border:1px solid #e2e8f0;font-weight:600}
.cloud li[data-weight="5"]{transform:scale(1.1)}
.cloud li[data-weight="4"]{opacity:.95}
.cloud li[data-weight="3"]{opacity:.9}
.cloud li[data-weight="2"]{opacity:.85}

/* Footer */
.site-footer{border-top:1px solid #e2e8f0;background:#fff}
.site-footer nav{display:flex;gap:16px;margin-bottom:6px}
.site-footer p{margin:0}

/* ========== Responsive ========== */
@media (max-width: 900px){.grid-3{grid-template-columns:1fr 1fr}}
@media (max-width: 600px){.nav{display:none}.grid-3{grid-template-columns:1fr}.hero{padding:36px 0}}