:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --accent: #f59e0b;
  --accent-dark: #d97706;
  --surface: #ffffff;
  --bg: #f8fafc;
  --text: #0f172a;
  --text-secondary: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.06);
  --shadow-lg: 0 10px 30px rgba(0,0,0,.12);
  --radius-full: 9999px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none}
button{cursor:pointer;font-family:inherit;border:none;background:none}
input{font-family:inherit;outline:none}

/* ── Utilities ── */
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 24px;border-radius:var(--radius-full);font-weight:600;font-size:14px;transition:.2s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-1px)}
.btn-outline{border:2px solid var(--border);color:var(--text)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}
.btn-ghost{color:var(--text-secondary)}
.btn-ghost:hover{color:var(--primary);background:var(--primary-light)}
.btn-sm{padding:6px 16px;font-size:13px}
.btn-lg{padding:14px 32px;font-size:16px}

/* ── Navigation ── */
.navbar{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.navbar .container{display:flex;align-items:center;gap:16px;height:64px}
.nav-logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--text);flex-shrink:0}
.nav-logo img{height:32px}
.nav-search{flex:1;max-width:480px;position:relative}
.nav-search input{width:100%;padding:10px 16px 10px 40px;border:2px solid var(--border);border-radius:var(--radius-full);font-size:14px;background:var(--bg);transition:.2s}
.nav-search input:focus{border-color:var(--primary);background:#fff}
.nav-search i{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--text-secondary)}
.nav-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}
.nav-actions .profile-badge{display:flex;align-items:center;gap:8px;padding:6px 12px;border-radius:var(--radius-full);background:var(--primary-light);font-size:13px;font-weight:600;color:var(--primary)}

/* ── Hero Section ── */
.hero{background:linear-gradient(135deg,#1e293b 0%,#0f172a 100%);color:#fff;padding:60px 0 80px;overflow:hidden}
.hero .container{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;background:rgba(255,255,255,.1);border-radius:var(--radius-full);font-size:13px;font-weight:500;margin-bottom:20px}
.hero h1{font-size:48px;font-weight:800;line-height:1.15;margin-bottom:16px}
.hero h1 span{background:linear-gradient(135deg,var(--accent),#f97316);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero p{font-size:18px;color:#94a3b8;margin-bottom:32px;max-width:500px}
.hero-stats{display:flex;gap:40px;margin-top:40px}
.hero-stat span{display:block}
.hero-stat-num{font-size:28px;font-weight:800}
.hero-stat-label{font-size:14px;color:#94a3b8}
.hero-visual{position:relative}
.hero-visual img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow-lg)}

/* ── Section Common ── */
.section{padding:60px 0}
.section-header{text-align:center;margin-bottom:40px}
.section-badge{display:inline-flex;align-items:center;gap:6px;padding:4px 14px;background:var(--primary-light);color:var(--primary);border-radius:var(--radius-full);font-size:13px;font-weight:600;margin-bottom:12px}
.section h2{font-size:32px;font-weight:700}
.section p{color:var(--text-secondary);margin-top:8px}

/* ── Category Grid ── */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(100px,1fr));gap:16px}
.cat-card{display:flex;flex-direction:column;align-items:center;gap:8px;padding:20px 12px;background:#fff;border:1px solid var(--border);border-radius:var(--radius);transition:.2s;cursor:pointer}
.cat-card:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:var(--shadow)}
.cat-card i{font-size:28px;color:var(--primary)}
.cat-card span{font-size:13px;font-weight:600;text-align:center}

/* ── Product Grid & Cards ── */
.product-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px}
.product-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:.2s}
.product-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.product-card-img{height:180px;background:var(--bg);display:flex;align-items:center;justify-content:center;font-size:48px;color:var(--border);position:relative}
.product-card-img .sale-badge{position:absolute;top:12px;left:12px;background:var(--accent);color:#fff;padding:4px 10px;border-radius:var(--radius-full);font-size:12px;font-weight:700}
.product-card-body{padding:16px}
.product-card-body .shop{font-size:12px;color:var(--text-secondary);margin-bottom:4px}
.product-card-body h3{font-size:15px;font-weight:600;margin-bottom:8px}
.product-card-body .price{display:flex;align-items:center;gap:8px}
.product-card-body .price .current{font-size:18px;font-weight:700;color:var(--primary)}
.product-card-body .price .original{font-size:14px;color:var(--text-secondary);text-decoration:line-through}
.product-card-body .price .discount{font-size:12px;font-weight:600;color:#16a34a}
.product-card-body .add-btn{width:100%;margin-top:12px}

/* ── Store Grid ── */
.store-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.store-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;transition:.2s}
.store-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.store-card-header{display:flex;align-items:center;gap:16px;margin-bottom:16px}
.store-card-header .store-avatar{width:48px;height:48px;border-radius:50%;background:var(--primary-light);display:flex;align-items:center;justify-content:center;font-size:20px;color:var(--primary);flex-shrink:0}
.store-card-header h3{font-size:16px;font-weight:600}
.store-card .store-meta{display:flex;gap:16px;font-size:13px;color:var(--text-secondary)}
.store-card .store-meta i{margin-right:4px}

/* ── How It Works ── */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.step-card{text-align:center;padding:32px 20px;background:#fff;border:1px solid var(--border);border-radius:var(--radius)}
.step-num{width:40px;height:40px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:18px;margin:0 auto 16px}
.step-card i{font-size:32px;color:var(--primary);margin-bottom:12px}
.step-card h3{font-size:16px;font-weight:600;margin-bottom:8px}
.step-card p{font-size:14px;color:var(--text-secondary)}

/* ── CTA Section ── */
.cta-section{background:linear-gradient(135deg,var(--primary),#7c3aed);color:#fff;text-align:center;padding:80px 0}
.cta-section h2{font-size:36px;font-weight:800;margin-bottom:12px}
.cta-section p{font-size:18px;opacity:.9;margin-bottom:32px}
.cta-section .btn-outline{border-color:#fff;color:#fff}
.cta-section .btn-outline:hover{background:#fff;color:var(--primary)}
.cta-cards{display:grid;grid-template-columns:1fr 1fr;gap:24px;max-width:700px;margin:0 auto}
.cta-card{background:rgba(255,255,255,.1);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.2);border-radius:var(--radius);padding:32px;text-align:left}
.cta-card i{font-size:40px;margin-bottom:16px}
.cta-card h3{font-size:20px;font-weight:700;margin-bottom:8px}
.cta-card p{font-size:14px;opacity:.8;margin-bottom:20px}

/* ── Footer ── */
.footer{background:#0f172a;color:#94a3b8;padding:60px 0 30px}
.footer .container{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px}
.footer-brand img{height:32px;margin-bottom:16px}
.footer-brand p{font-size:14px;line-height:1.7}
.footer h4{color:#fff;font-weight:600;margin-bottom:16px;font-size:14px;text-transform:uppercase;letter-spacing:1px}
.footer a{display:block;color:#94a3b8;font-size:14px;margin-bottom:10px;transition:.2s}
.footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid #1e293b;margin-top:40px;padding-top:24px;display:flex;justify-content:space-between;align-items:center;font-size:13px}

/* ── Auth Panel ── */
.overlay{position:fixed;inset:0;z-index:200;background:rgba(0,0,0,.5);display:none;align-items:center;justify-content:center;padding:20px}
.overlay.show{display:flex}
.auth-card{background:#fff;border-radius:16px;padding:40px;width:100%;max-width:420px;position:relative;animation:slideUp .3s}
@keyframes slideUp{from{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}
.auth-card .close-btn{position:absolute;top:16px;right:16px;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--text-secondary)}
.auth-card .close-btn:hover{background:var(--bg)}
.auth-card h2{font-size:24px;font-weight:700;margin-bottom:4px}
.auth-card p{color:var(--text-secondary);font-size:14px;margin-bottom:24px}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:13px;font-weight:600;margin-bottom:6px}
.form-group input,.form-group select{width:100%;padding:12px 16px;border:2px solid var(--border);border-radius:8px;font-size:14px;transition:.2s}
.form-group input:focus{border-color:var(--primary)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.auth-card .btn-primary{width:100%;padding:14px;margin-top:8px}
.auth-card .auth-toggle{text-align:center;margin-top:16px;font-size:14px}
.auth-card .auth-toggle button{color:var(--primary);font-weight:600}

/* ── Toast ── */
.toast-container{position:fixed;top:20px;right:20px;z-index:300;display:flex;flex-direction:column;gap:8px}
.toast{padding:14px 20px;border-radius:8px;font-size:14px;font-weight:500;animation:slideIn .3s;max-width:360px}
.toast.success{background:#16a34a;color:#fff}
.toast.error{background:#dc2626;color:#fff}
.toast.info{background:var(--primary);color:#fff}
@keyframes slideIn{from{transform:translateX(100%);opacity:0}to{transform:translateX(0);opacity:1}}

/* ── Loading ── */
.loading{display:flex;align-items:center;justify-content:center;padding:60px;color:var(--text-secondary)}
.spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .6s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── Responsive ── */
@media(max-width:768px){
  .navbar .container{height:56px;gap:8px}
  .nav-search{display:none}
  .hero .container{grid-template-columns:1fr;gap:32px;text-align:center}
  .hero h1{font-size:32px}
  .hero p{font-size:16px;max-width:none}
  .hero-stats{justify-content:center}
  .hero-visual{display:none}
  .steps{grid-template-columns:1fr 1fr}
  .cat-grid{grid-template-columns:repeat(auto-fill,minmax(80px,1fr))}
  .product-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}
  .cta-cards{grid-template-columns:1fr}
  .footer .container{grid-template-columns:1fr 1fr}
  .footer-bottom{flex-direction:column;gap:12px;text-align:center}
}
@media(max-width:480px){
  .hero h1{font-size:28px}
  .steps{grid-template-columns:1fr}
  .cat-grid{grid-template-columns:repeat(auto-fill,minmax(72px,1fr))}
  .product-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
}