/* E-Commerce Platform - Modern Design System with Dark/Light Mode */

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

/* CSS Variables - Light Theme (Default) */
:root[data-theme="light"] {
    /* Colors */
    --primary: hsl(260, 80%, 55%);
    --primary-dark: hsl(260, 80%, 45%);
    --primary-light: hsl(260, 80%, 65%);
    --secondary: hsl(200, 90%, 50%);
    --accent: hsl(330, 85%, 55%);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, hsl(260, 80%, 55%) 0%, hsl(290, 75%, 60%) 100%);
    --gradient-secondary: linear-gradient(135deg, hsl(200, 90%, 50%) 0%, hsl(230, 85%, 55%) 100%);
    --gradient-accent: linear-gradient(135deg, hsl(330, 85%, 55%) 0%, hsl(10, 80%, 60%) 100%);

    /* Neutral Colors - Light Mode */
    --bg-primary: hsl(0, 0%, 98%);
    --bg-secondary: hsl(0, 0%, 100%);
    --bg-tertiary: hsl(240, 20%, 96%);
    --text-primary: hsl(240, 15%, 10%);
    --text-secondary: hsl(240, 10%, 40%);
    --text-muted: hsl(240, 5%, 60%);
    --border: hsl(240, 10%, 90%);

    /* Semantic Colors */
    --success: hsl(140, 70%, 45%);
    --warning: hsl(40, 95%, 50%);
    --error: hsl(0, 75%, 50%);
    --info: hsl(200, 90%, 50%);

    /* Shadows - Light Mode */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --shadow-glow: 0 0 20px rgba(160, 100, 255, 0.2);
}

/* Dark Theme */
:root[data-theme="dark"],
:root {
    /* Colors */
    --primary: hsl(260, 80%, 60%);
    --primary-dark: hsl(260, 80%, 50%);
    --primary-light: hsl(260, 80%, 70%);
    --secondary: hsl(200, 90%, 55%);
    --accent: hsl(330, 85%, 60%);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, hsl(260, 80%, 60%) 0%, hsl(290, 75%, 65%) 100%);
    --gradient-secondary: linear-gradient(135deg, hsl(200, 90%, 55%) 0%, hsl(230, 85%, 60%) 100%);
    --gradient-accent: linear-gradient(135deg, hsl(330, 85%, 60%) 0%, hsl(10, 80%, 65%) 100%);

    /* Neutral Colors - Dark Mode */
    --bg-primary: hsl(240, 15%, 10%);
    --bg-secondary: hsl(240, 12%, 15%);
    --bg-tertiary: hsl(240, 10%, 20%);
    --text-primary: hsl(0, 0%, 95%);
    --text-secondary: hsl(0, 0%, 70%);
    --text-muted: hsl(0, 0%, 50%);
    --border: hsl(240, 10%, 25%);

    /* Semantic Colors */
    --success: hsl(140, 70%, 50%);
    --warning: hsl(40, 95%, 55%);
    --error: hsl(0, 75%, 55%);
    --info: hsl(200, 90%, 50%);

    /* Shadows - Dark Mode */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(160, 100, 255, 0.3);
}

/* Spacing */
:root {
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Smooth theme transition */
* {
    transition: background-color var(--transition-base),
        color var(--transition-base),
        border-color var(--transition-base);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 2rem;
}

h4 {
    font-size: 1.5rem;
}

h5 {
    font-size: 1.25rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
.header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

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

.logo {
    font-size: 1.75rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: none;
}

.nav {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-base);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.nav a:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.nav-icons {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

/* Theme Toggle Button */
.theme-toggle {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.theme-toggle:hover {
    background: var(--bg-primary);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.icon-btn {
    position: relative;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--gradient-accent);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: var(--radius-full);
    min-width: 20px;
    text-align: center;
    transition: none;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--primary);
}

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

.btn-danger {
    background: var(--error);
    color: white;
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
}

/* Cards */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.product-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-base);
    position: relative;
    box-shadow: var(--shadow-sm);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.product-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
    background: var(--bg-tertiary);
    transition: transform var(--transition-slow);
}

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

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

.product-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.product-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-price {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
    transition: none;
}

.product-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.wishlist-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-base);
    font-size: 1.25rem;
}

.wishlist-btn:hover {
    background: var(--gradient-accent);
    border-color: transparent;
    transform: scale(1.1);
}

.wishlist-btn.active {
    background: var(--gradient-accent);
    border-color: transparent;
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-primary);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(160, 100, 255, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

/* Grid */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* Hero Section */
.hero {
    padding: var(--spacing-2xl) 0;
    text-align: center;
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><circle cx="100" cy="100" r="100" fill="rgba(255,255,255,0.05)"/><circle cx="1000" cy="400" r="150" fill="rgba(255,255,255,0.05)"/></svg>');
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

.hero p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-lg);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    margin-top: var(--spacing-2xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    margin-bottom: var(--spacing-sm);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border);
    color: var(--text-muted);
}

/* Alert Messages */
.alert {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
    border-left: 4px solid;
}

.alert-success {
    background: rgba(74, 222, 128, 0.1);
    border-color: var(--success);
    color: var(--success);
}

.alert-error {
    background: rgba(248, 113, 113, 0.1);
    border-color: var(--error);
    color: var(--error);
}

.alert-info {
    background: rgba(96, 165, 250, 0.1);
    border-color: var(--info);
    color: var(--info);
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    z-index: 9999;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Loading Spinner */
.spinner {
    border: 3px solid var(--bg-tertiary);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

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

    100% {
        transform: rotate(360deg);
    }
}

/* Responsive Design */

/* Tablet and below (768px) */
@media (max-width: 768px) {

    /* Grid adjustments */
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    /* Header mobile layout */
    .header {
        padding: var(--spacing-sm) 0;
    }

    .header-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .logo {
        font-size: 1.5rem;
    }

    /* Navigation mobile */
    .nav {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-xs);
    }

    .nav a {
        font-size: 0.875rem;
        padding: var(--spacing-xs);
    }

    .nav-icons {
        flex-wrap: wrap;
        justify-content: center;
    }

    /* Hero section mobile */
    .hero {
        padding: var(--spacing-xl) 0;
    }

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

    .hero p {
        font-size: 1rem;
    }

    /* Typography mobile */
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    h3 {
        font-size: 1.5rem;
    }

    h4 {
        font-size: 1.25rem;
    }

    /* Cards mobile */
    .card {
        padding: var(--spacing-sm);
    }

    /* Product cards mobile */
    .product-card {
        max-width: 100%;
    }

    .product-image {
        height: 200px;
    }

    /* Buttons mobile - larger touch targets */
    .btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1rem;
        min-height: 44px;
        /* iOS recommended touch target */
    }

    .btn-small {
        padding: var(--spacing-xs) var(--spacing-sm);
        min-height: 36px;
    }

    /* Icon buttons - larger for touch */
    .icon-btn,
    .theme-toggle {
        min-width: 44px;
        min-height: 44px;
        font-size: 1.1rem;
    }

    /* Forms mobile */
    .form-input,
    .form-textarea,
    .form-select {
        font-size: 16px;
        /* Prevents zoom on iOS */
        padding: var(--spacing-sm);
    }

    /* Container mobile */
    .container {
        padding: 0 var(--spacing-sm);
    }

    /* Footer mobile */
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    /* Toast mobile */
    .toast {
        left: var(--spacing-sm);
        right: var(--spacing-sm);
        bottom: var(--spacing-sm);
    }
}

/* Mobile phones (480px) */
@media (max-width: 480px) {

    /* Even smaller typography */
    .hero h1 {
        font-size: 2rem;
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    /* Compact spacing */
    .hero {
        padding: var(--spacing-lg) 0;
    }

    /* Product grid - 1 column on very small screens */
    .grid-4 {
        grid-template-columns: 1fr;
    }

    /* Smaller product images */
    .product-image {
        height: 180px;
    }

    /* Stack buttons vertically */
    .product-actions {
        flex-direction: column;
    }

    .product-actions .btn {
        width: 100%;
    }

    /* Navigation full width */
    .nav {
        width: 100%;
    }

    .nav a {
        flex: 1;
        text-align: center;
    }

    /* Icon buttons smaller spacing */
    .nav-icons {
        gap: var(--spacing-xs);
    }
}

/* Landscape mobile (max height 500px) */
@media (max-height: 500px) and (orientation: landscape) {
    .hero {
        padding: var(--spacing-md) 0;
    }

    .hero h1 {
        font-size: 1.75rem;
    }

    .header {
        position: relative;
        /* Don't stick on landscape */
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {

    /* Larger touch targets */
    .btn,
    .icon-btn,
    .theme-toggle,
    .wishlist-btn {
        min-width: 44px;
        min-height: 44px;
    }

    /* Remove hover effects on touch devices */
    .card:hover,
    .product-card:hover {
        transform: none;
    }

    /* Tap highlight color */
    * {
        -webkit-tap-highlight-color: rgba(160, 100, 255, 0.2);
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.mt-1 {
    margin-top: var(--spacing-sm);
}

.mt-2 {
    margin-top: var(--spacing-md);
}

.mt-3 {
    margin-top: var(--spacing-lg);
}

.mb-1 {
    margin-bottom: var(--spacing-sm);
}

.mb-2 {
    margin-bottom: var(--spacing-md);
}

.mb-3 {
    margin-bottom: var(--spacing-lg);
}

.flex {
    display: flex;
}

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

.gap-1 {
    gap: var(--spacing-sm);
}

.gap-2 {
    gap: var(--spacing-md);
}