/* ===== DESIGN TOKENS ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  /* DARK THEME (Default) */
  --bg-primary: #0a0a0f;
  --bg-secondary: #11111a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --glass-bg: rgba(10, 10, 15, 0.7);
  --glass-border: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent: #dc2626; /* Crimson Red */
  --accent-light: #ef4444;
  --accent-dark: #991b1b;
  --accent-glow: rgba(220, 38, 38, 0.25);
  --gradient-main: linear-gradient(135deg, #dc2626, #ef4444);
  --gradient-subtle: linear-gradient(135deg, rgba(220,38,38,0.15), rgba(239,68,68,0.05));
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
  --shadow-sm: 0 4px 12px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 30px var(--accent-glow);
  
  --font-body: 'Inter', sans-serif;
  --font-heading: 'Outfit', sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --glass-bg: rgba(255, 255, 255, 0.8);
  --glass-border: rgba(0, 0, 0, 0.08);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --shadow-sm: 0 4px 12px rgba(0,0,0,0.05);
  --shadow-md: 0 8px 30px rgba(0,0,0,0.08);
}

/* ===== RESET ===== */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}
a { text-decoration:none; color:inherit; }
ul { list-style:none; }
img { max-width:100%; display:block; }
button { cursor:pointer; border:none; background:none; font-family:inherit; }

/* ===== UTILITIES ===== */
.container { max-width:1200px; margin:0 auto; padding:0 24px; }
.section { padding:100px 0; position:relative; }
.gradient-text {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.badge {
  display:inline-flex; align-items:center; justify-content:center;
  padding:4px 12px; border-radius:var(--radius-full);
  font-size:0.75rem; font-weight:600; text-transform:uppercase; letter-spacing:0.5px;
}
.badge-admin { background:rgba(220,38,38,0.15); color:var(--accent-light); border:1px solid rgba(220,38,38,0.3); }
.badge-seller { background:rgba(59,130,246,0.15); color:#60a5fa; border:1px solid rgba(59,130,246,0.3); }
.badge-client { background:rgba(16,185,129,0.15); color:#34d399; border:1px solid rgba(16,185,129,0.3); }

/* Buttons */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:12px 24px; border-radius:var(--radius-full);
  font-weight:600; font-size:0.95rem; transition:var(--transition);
  cursor:pointer; text-align:center;
}
.btn-primary {
  background:var(--gradient-main); color:#fff;
}
.btn-primary:hover {
  transform:translateY(-2px); box-shadow:var(--shadow-glow);
}
.btn-secondary {
  background:var(--bg-card); border:1px solid var(--glass-border); color:var(--text-primary);
}
.btn-secondary:hover {
  border-color:var(--accent); background:rgba(220,38,38,0.05); transform:translateY(-2px);
}
.btn-sm { padding:8px 16px; font-size:0.85rem; }

/* Form Elements */
.form-group { margin-bottom: 20px; }
.form-group label { display:block; margin-bottom:8px; font-size:0.9rem; font-weight:500; color:var(--text-secondary); }
.form-control {
  width:100%; padding:12px 16px; border-radius:var(--radius-md);
  background:var(--bg-secondary); border:1px solid var(--glass-border);
  color:var(--text-primary); font-family:inherit; font-size:1rem;
  transition:var(--transition); outline:none;
}
.form-control:focus {
  border-color:var(--accent); box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ===== NAVBAR ===== */
.navbar {
  position:fixed; top:0; left:0; right:0; z-index:1000;
  padding:20px 0; transition:var(--transition);
}
.navbar.scrolled {
  padding:15px 0; background:var(--glass-bg);
  backdrop-filter:blur(16px); border-bottom:1px solid var(--glass-border);
}
.navbar-container {
  display:flex; justify-content:space-between; align-items:center;
}
.nav-brand {
  font-family:var(--font-heading); font-size:1.5rem; font-weight:800;
  color:var(--text-primary); display:flex; align-items:center; gap:8px;
}
.nav-menu { display:flex; gap:30px; align-items:center; }
.nav-menu a {
  font-weight:500; color:var(--text-secondary); transition:var(--transition);
}
.nav-menu a:hover, .nav-menu a.active { color:var(--text-primary); }
.nav-right { display:flex; gap:15px; align-items:center; }

.theme-toggle {
  width:40px; height:40px; border-radius:50%; display:flex; align-items:center; justify-content:center;
  background:var(--bg-card); border:1px solid var(--glass-border); color:var(--text-primary);
  transition:var(--transition);
}
.theme-toggle:hover { border-color:var(--accent); color:var(--accent); }

/* ===== HERO SECTION ===== */
.hero {
  min-height:90vh; display:flex; align-items:center; justify-content:center;
  text-align:center; position:relative; overflow:hidden; padding-top:80px;
}
.hero-bg {
  position:absolute; inset:0; z-index:-1;
  background: radial-gradient(ellipse 80% 60% at 50% -20%, rgba(220,38,38,0.15), transparent);
}
.hero-grid {
  position:absolute; inset:0; z-index:-1;
  background-image: linear-gradient(var(--glass-border) 1px, transparent 1px),
                    linear-gradient(90deg, var(--glass-border) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, black, transparent);
  -webkit-mask-image: radial-gradient(ellipse 60% 60% at 50% 50%, black, transparent);
  opacity:0.5;
}
.hero h1 {
  font-family:var(--font-heading); font-size:clamp(3rem, 6vw, 4.5rem);
  font-weight:800; line-height:1.1; margin-bottom:20px;
}
.hero p {
  font-size:1.1rem; color:var(--text-secondary); max-width:600px; margin:0 auto 40px;
}
.hero-actions { display:flex; gap:16px; justify-content:center; }

/* ===== PRODUCTS GRID ===== */
.products-grid {
  display:grid; grid-template-columns:repeat(auto-fill, minmax(300px, 1fr)); gap:24px;
}
.product-card {
  background:var(--bg-card); border:1px solid var(--glass-border);
  border-radius:var(--radius-lg); overflow:hidden;
  transition:var(--transition);
  display:flex; flex-direction:column;
}
.product-card:hover {
  transform:translateY(-5px); border-color:var(--accent);
  box-shadow:var(--shadow-md), var(--shadow-glow);
}
.product-image {
  width:100%; aspect-ratio:16/9; background:var(--bg-secondary);
  position:relative; overflow:hidden;
}
.product-image img { width:100%; height:100%; object-fit:cover; transition:transform 0.5s ease; }
.product-card:hover .product-image img { transform:scale(1.05); }
.product-badge {
  position:absolute; top:12px; right:12px;
  background:rgba(0,0,0,0.6); backdrop-filter:blur(4px);
  color:#fff; padding:4px 12px; border-radius:var(--radius-full);
  font-size:0.75rem; font-weight:600;
}
.product-content { padding:24px; display:flex; flex-direction:column; flex-grow:1; }
.product-category { font-size:0.8rem; color:var(--accent); font-weight:600; text-transform:uppercase; margin-bottom:8px; }
.product-title { font-family:var(--font-heading); font-size:1.2rem; font-weight:700; margin-bottom:8px; }
.product-desc { color:var(--text-secondary); font-size:0.9rem; margin-bottom:20px; flex-grow:1; }
.product-footer {
  display:flex; justify-content:space-between; align-items:center;
  padding-top:16px; border-top:1px solid var(--glass-border);
}
.product-price { font-weight:700; font-size:1.2rem; color:var(--text-primary); }

/* ===== ADMIN DASHBOARD ===== */
.admin-grid { display:grid; grid-template-columns:250px 1fr; gap:30px; min-height:80vh; padding-top:100px; }
.admin-sidebar {
  background:var(--bg-card); border-right:1px solid var(--glass-border);
  border-radius:var(--radius-md); padding:20px;
}
.admin-nav { display:flex; flex-direction:column; gap:10px; }
.admin-nav a {
  padding:12px 16px; border-radius:var(--radius-sm); color:var(--text-secondary);
  transition:var(--transition); font-weight:500;
}
.admin-nav a:hover, .admin-nav a.active {
  background:var(--gradient-subtle); color:var(--accent-light);
}
.admin-content { padding-bottom:40px; }
.stat-cards { display:grid; grid-template-columns:repeat(auto-fit, minmax(200px,1fr)); gap:20px; margin-bottom:30px; }
.stat-card {
  background:var(--bg-card); border:1px solid var(--glass-border);
  padding:24px; border-radius:var(--radius-md); display:flex; align-items:center; gap:20px;
}
.stat-icon {
  width:50px; height:50px; border-radius:var(--radius-sm);
  background:var(--gradient-subtle); color:var(--accent-light);
  display:flex; align-items:center; justify-content:center; font-size:1.5rem;
}
.stat-info h3 { font-size:1.8rem; font-weight:700; margin-bottom:4px; font-family:var(--font-heading); }
.stat-info p { color:var(--text-secondary); font-size:0.9rem; }

/* Tables */
.table-wrap { overflow-x:auto; background:var(--bg-card); border:1px solid var(--glass-border); border-radius:var(--radius-md); }
.table { width:100%; border-collapse:collapse; }
.table th, .table td { padding:16px 20px; text-align:left; border-bottom:1px solid var(--glass-border); }
.table th { font-weight:600; color:var(--text-muted); font-size:0.85rem; text-transform:uppercase; }
.table tbody tr:hover { background:var(--bg-card-hover); }
.table td { font-size:0.95rem; }

/* Alerts */
.alert { padding:16px 20px; border-radius:var(--radius-md); margin-bottom:20px; font-weight:500; }
.alert-success { background:rgba(16,185,129,0.1); border:1px solid rgba(16,185,129,0.3); color:#34d399; }
.alert-error { background:rgba(239,68,68,0.1); border:1px solid rgba(239,68,68,0.3); color:#f87171; }

/* Footer */
.footer { border-top:1px solid var(--glass-border); padding:40px 0; text-align:center; color:var(--text-secondary); }

/* Auth Card */
.auth-container { display:flex; justify-content:center; align-items:center; min-height:80vh; padding-top:80px; }
.auth-card {
  background:var(--bg-card); border:1px solid var(--glass-border);
  padding:40px; border-radius:var(--radius-lg); width:100%; max-width:480px;
  box-shadow:var(--shadow-md);
}
.auth-card h2 { font-family:var(--font-heading); font-size:2rem; font-weight:700; margin-bottom:8px; text-align:center; }
.auth-card p { text-align:center; color:var(--text-secondary); margin-bottom:30px; }