/* 
   Electronics Store Design System 
   Theme: Modern, Tech, Clean
*/

:root {
    /* Colors */
    --color-primary: #0B1F3B; /* Dark Blue / Navy */
    --color-accent: #0A65FF;  /* Electric Blue */
    --color-accent-hover: #0056d6;
    --color-bg: #F4F6F9;      /* Light Grey */
    --color-white: #FFFFFF;
    --color-text-dark: #1a1a1a;
    --color-text-gray: #666666;
    --color-border: #e1e1e1;
    --color-success: #28a745;
    --color-danger: #dc3545;

    /* Typography */
    --font-heading: 'Poppins', 'Montserrat', sans-serif;
    --font-body: 'Inter', 'Open Sans', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-hover: 0 10px 25px rgba(10, 101, 255, 0.15);

    /* Transitions */
    --transition: all 0.3s ease;
    
    /* Container */
    --container-width: 1200px;
    --header-height: 80px;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Utilities */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.section {
    padding: var(--spacing-lg) 0;
}

.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: 600;
    font-family: var(--font-heading);
    cursor: pointer;
    border: none;
    transition: var(--transition);
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--color-accent);
    color: var(--color-accent);
}

.btn-outline:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
}

/* Header & Navigation */
.header {
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--header-height);
    display: flex;
    align-items: center;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    font-weight: 500;
    color: var(--color-primary);
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--color-accent);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: var(--transition);
}

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

.mobile-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-primary);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #0B1F3B 0%, #1a3a63 100%);
    color: var(--color-white);
    padding: 8rem 0 6rem;
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 600px;
    position: relative;
    z-index: 2;
}

.hero h1 {
    color: var(--color-white);
    font-size: 3.5rem;
    margin-bottom: var(--spacing-sm);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

/* Product Cards */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.product-card {
    background: var(--color-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.product-image {
    height: 200px;
    background-color: #f0f0f0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-info {
    padding: var(--spacing-sm);
}

.product-category {
    font-size: 0.8rem;
    color: var(--color-text-gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.25rem;
}

.product-title {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--color-primary);
}

.product-price {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.product-specs {
    font-size: 0.9rem;
    color: var(--color-text-gray);
    margin-bottom: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
    padding-top: 0.5rem;
}

/* Categories */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.category-card {
    background: var(--color-white);
    padding: var(--spacing-md);
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid transparent;
}

.category-card:hover {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-md);
}

.category-icon {
    font-size: 3rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

/* Features / Why Us */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.feature-item {
    text-align: center;
    padding: var(--spacing-md);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background-color: rgba(10, 101, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-sm);
    color: var(--color-accent);
    font-size: 1.5rem;
}

/* Footer */
.footer {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer h3 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255,255,255,0.7);
}

.footer-links a:hover {
    color: var(--color-accent);
    padding-left: 5px;
}

.copyright {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.5);
    font-size: 0.9rem;
}

/* Contact Form */
.contact-form {
    background: var(--color-white);
    padding: var(--spacing-md);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.form-group {
    margin-bottom: var(--spacing-sm);
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-family: var(--font-body);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(10, 101, 255, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .mobile-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--color-white);
        flex-direction: column;
        padding: var(--spacing-md);
        transition: var(--transition);
        box-shadow: var(--shadow-md);
    }

    .nav-links.active {
        left: 0;
    }

    .hero-buttons {
        flex-direction: column;
    }
}