:root{
  --bg:#ffffff; --surface:#f6f9fc; --muted:#eef3f8; --text:#0f1f33; --sub:#5b6b80;
  --primary:#2b8ad6; --primary-700:#1f6fae; --accent:#e8f3fb; --border:#dbe5ef;
  --shadow:0 4px 16px rgba(15,31,51,.08); --radius:14px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.55;}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-700)}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px;gap:16px}
.logo{font-weight:800;font-size:22px;color:var(--text)}
.logo span{color:var(--primary)}
.main-nav{display:flex;gap:22px}
.main-nav a{color:var(--text);font-weight:500}
.main-nav a:hover{color:var(--primary)}
.cart-link{background:var(--primary);color:#fff;padding:10px 16px;border-radius:999px;font-weight:600;transition:.2s}
.cart-link:hover{background:var(--primary-700);color:#fff}
.cart-link .badge{background:#fff;color:var(--primary);border-radius:999px;padding:2px 8px;margin-left:6px;font-size:13px;font-weight:700}

/* Hero */
.hero{background:linear-gradient(135deg,var(--accent),#fff);padding:80px 0;text-align:center}
.hero h1{font-size:clamp(32px,5vw,52px);margin:0 0 16px;letter-spacing:-.02em}
.hero p{font-size:18px;color:var(--sub);max-width:680px;margin:0 auto 28px}
.btn{display:inline-block;background:var(--primary);color:#fff;padding:14px 28px;border-radius:10px;font-weight:600;border:none;cursor:pointer;transition:.2s;font-size:16px}
.btn:hover{background:var(--primary-700);color:#fff;transform:translateY(-1px)}
.btn-outline{background:transparent;color:var(--primary);border:1.5px solid var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}

/* Sections */
section{padding:64px 0}
section h2{font-size:32px;margin:0 0 8px;text-align:center}
section .lead{text-align:center;color:var(--sub);margin:0 auto 36px;max-width:640px}

/* Product grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:24px}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:.25s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--primary)}
.card .thumb{aspect-ratio:1/1;background:var(--surface);overflow:hidden}
.card .thumb img{width:100%;height:100%;object-fit:cover;transition:.4s}
.card:hover .thumb img{transform:scale(1.05)}
.card .body{padding:18px;display:flex;flex-direction:column;gap:8px;flex:1}
.card h3{margin:0;font-size:17px}
.card .desc{color:var(--sub);font-size:14px;margin:0;flex:1}
.card .row{display:flex;align-items:center;justify-content:space-between;margin-top:10px}
.price{font-size:20px;font-weight:700;color:var(--primary)}

/* Features */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;margin-top:24px}
.feature{background:var(--surface);padding:24px;border-radius:var(--radius);text-align:center}
.feature .ico{width:48px;height:48px;border-radius:50%;background:var(--accent);color:var(--primary);display:flex;align-items:center;justify-content:center;margin:0 auto 12px;font-size:22px;font-weight:700}

/* Forms */
form .field{margin-bottom:16px}
label{display:block;font-weight:600;margin-bottom:6px;font-size:14px}
input,textarea,select{width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:10px;font:inherit;background:#fff}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--accent)}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:640px){.form-grid{grid-template-columns:1fr}}

/* Cart */
.cart-table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.cart-table th,.cart-table td{padding:14px;border-bottom:1px solid var(--border);text-align:left;vertical-align:middle}
.cart-table th{background:var(--surface);font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--sub)}
.cart-table img{width:64px;height:64px;object-fit:cover;border-radius:8px}
.qty{display:inline-flex;align-items:center;border:1px solid var(--border);border-radius:8px;overflow:hidden}
.qty button{width:32px;height:36px;border:0;background:var(--surface);cursor:pointer;font-size:16px}
.qty input{width:48px;text-align:center;border:0;border-left:1px solid var(--border);border-right:1px solid var(--border);height:36px;border-radius:0}
.summary{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.summary .line{display:flex;justify-content:space-between;padding:8px 0;color:var(--sub)}
.summary .total{display:flex;justify-content:space-between;padding-top:14px;border-top:1px solid var(--border);font-size:20px;font-weight:700;color:var(--text);margin-top:8px}

/* Steps */
.steps{display:flex;justify-content:center;gap:8px;margin-bottom:32px}
.step{padding:8px 18px;border-radius:999px;background:var(--surface);color:var(--sub);font-weight:600;font-size:14px}
.step.active{background:var(--primary);color:#fff}
.step.done{background:#22c55e;color:#fff}

/* Blog */
.blog-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}
.post{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:.25s}
.post:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.post .thumb{aspect-ratio:16/10;background:var(--surface);overflow:hidden}
.post .thumb img{width:100%;height:100%;object-fit:cover}
.post .body{padding:18px}
.post .cat{font-size:12px;color:var(--primary);font-weight:700;text-transform:uppercase;letter-spacing:.05em}
.post h3{margin:6px 0 8px;font-size:18px}
.post p{color:var(--sub);font-size:14px;margin:0}

/* Footer */
.site-footer{background:#0f1f33;color:#cdd9e6;padding:48px 0 20px;margin-top:80px}
.site-footer h4{color:#fff;margin:0 0 12px;font-size:16px}
.site-footer a{color:#cdd9e6}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:32px;padding-bottom:32px;border-bottom:1px solid #1e3450}
.socials a{display:inline-block;width:36px;height:36px;line-height:36px;text-align:center;background:#1e3450;border-radius:50%;margin-right:8px;font-size:13px;font-weight:700}
.copy{padding-top:20px;font-size:13px;color:#7a8ba0;text-align:center}

/* Alerts */
.alert{padding:14px 18px;border-radius:10px;margin-bottom:20px}
.alert.success{background:#dcfce7;color:#166534;border:1px solid #86efac}
.alert.error{background:#fee2e2;color:#991b1b;border:1px solid #fca5a5}
.alert.info{background:var(--accent);color:var(--primary-700);border:1px solid #b7dcf2}

/* Two-column checkout */
.checkout-layout{display:grid;grid-template-columns:1.6fr 1fr;gap:32px}
@media(max-width:900px){.checkout-layout{grid-template-columns:1fr}}

/* Animations */
.fade-in{animation:fade .5s ease both}
@keyframes fade{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

/* Admin */
.admin-layout{display:grid;grid-template-columns:240px 1fr;min-height:100vh}
.admin-sidebar{background:#0f1f33;color:#cdd9e6;padding:24px 0}
.admin-sidebar .brand{padding:0 24px 24px;font-weight:800;font-size:20px;color:#fff;border-bottom:1px solid #1e3450;margin-bottom:16px}
.admin-sidebar a{display:block;padding:12px 24px;color:#cdd9e6;border-left:3px solid transparent}
.admin-sidebar a:hover,.admin-sidebar a.active{background:#1e3450;color:#fff;border-left-color:var(--primary)}
.admin-main{padding:32px;background:var(--surface)}
.admin-main h1{margin-top:0}
.admin-table{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.admin-table th,.admin-table td{padding:12px;border-bottom:1px solid var(--border);text-align:left;font-size:14px}
.admin-table th{background:var(--surface);text-transform:uppercase;font-size:12px;color:var(--sub);letter-spacing:.05em}
.admin-card{background:#fff;border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);margin-bottom:24px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:24px}
.stat{background:#fff;border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.stat .v{font-size:28px;font-weight:700;color:var(--primary)}
.stat .l{font-size:13px;color:var(--sub);text-transform:uppercase;letter-spacing:.05em}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.btn-sm{padding:6px 12px;font-size:13px;border-radius:8px}
.btn-danger{background:#dc2626}
.btn-danger:hover{background:#991b1b}
.btn-secondary{background:#64748b}
.btn-secondary:hover{background:#475569}
.tabs{display:flex;gap:4px;border-bottom:2px solid var(--border);margin-bottom:24px}
.tabs a{padding:10px 18px;color:var(--sub);font-weight:600;border-bottom:2px solid transparent;margin-bottom:-2px}
.tabs a.active{color:var(--primary);border-bottom-color:var(--primary)}

/* Mobile nav */
@media(max-width:720px){
  .main-nav{display:none}
  .nav{flex-wrap:wrap}
}