:root {
    --primary-color: #0ea5e9; /* Sky blue */
    --secondary-color: #0284c7; /* Darker blue */
    --accent-color: #38bdf8;
    --background-start: #f8fafc;
    --background-end: #e2e8f0;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --card-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, var(--background-start) 0%, var(--background-end) 100%);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Glassmorphism Header */
header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 1rem 0;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: -0.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo span {
    color: var(--text-main);
}

.nav-links {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    padding: 80px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 30px;
    line-height: 1.6;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 10px 20px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 25px rgba(14, 165, 233, 0.4);
}

/* Product Section & Filter */
.products-section {
    padding: 60px 0;
    display: flex;
    gap: 30px;
}

.sidebar {
    width: 280px;
    flex-shrink: 0;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 25px;
    box-shadow: var(--glass-shadow);
    height: fit-content;
    position: sticky;
    top: 100px;
}

.filter-group {
    margin-bottom: 25px;
}

.filter-group h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--text-main);
    border-bottom: 2px solid rgba(14, 165, 233, 0.1);
    padding-bottom: 8px;
}

.filter-label {
    display: block;
    margin-bottom: 10px;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: color 0.2s;
}

.filter-label:hover {
    color: var(--primary-color);
}

.products-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.product-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 20px;
    box-shadow: var(--glass-shadow);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(31, 38, 135, 0.15);
}

.product-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 15px;
    margin-bottom: 20px;
    background-color: #f1f5f9;
}

.product-category {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--primary-color);
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 5px;
}

.product-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-main);
}

.product-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.badge {
    background: rgba(14, 165, 233, 0.1);
    color: var(--primary-color);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.product-bottom {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid rgba(0,0,0,0.05);
    padding-top: 15px;
}

.product-price {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-main);
}

/* Footer */
footer {
    margin-top: auto;
    background: #0f172a;
    color: #f8fafc;
    padding: 40px 0;
    text-align: center;
}

/* Utilities */
.text-center { text-align: center; }
.mt-4 { margin-top: 2rem; }

/* Loader */
.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 40px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}