/* =========================================
   1. CSS VARIABLES & THEME SETUP
   ========================================= */
:root {
    /* Brand Colors */
    --color-primary: #3b82f6;       /* Vibrant Blue */
    --color-primary-dark: #2563eb;  /* Darker Blue */
    --color-secondary: #10b981;     /* Success Green */
    --color-accent: #f59e0b;        /* Warning/Accent Orange */
    --color-danger: #ef4444;        /* Danger Red */

    /* Neutral Colors (Light Mode Default) */
    --color-bg-body: #f8fafc;       /* Light Blue-Grey Background */
    --color-bg-card: #ffffff;       /* White Card Background */
    --color-text-main: #1e293b;     /* Dark Slate Text */
    --color-text-muted: #64748b;    /* Muted Slate Text */
    --color-border: #e2e8f0;        /* Light Border */

    /* Dark Mode Overrides (Class-based or System pref) */
    --color-dark-bg-body: #0f172a;
    --color-dark-bg-card: #1e293b;
    --color-dark-text-main: #f1f5f9;
    --color-dark-text-muted: #94a3b8;
    --color-dark-border: #334155;

    /* Typography */
    --font-main: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;

    /* Spacing & Layout */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 4rem;
    
    --container-width: 1280px;
    --border-radius: 8px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

/* =========================================
   2. RESET & BASE STYLES
   ========================================= */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg-body);
    color: var(--color-text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text-main);
    margin-bottom: var(--spacing-md);
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
    border-radius: var(--border-radius);
}

/* =========================================
   3. UTILITY CLASSES
   ========================================= */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

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

.d-flex { display: flex; }
.flex-col { flex-direction: column; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.items-center { align-items: center; }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.d-grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    font-family: var(--font-main);
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}
.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-bg-card);
    color: var(--color-text-main);
    border: 1px solid var(--color-border);
}
.btn-secondary:hover {
    background-color: #f1f5f9;
    border-color: var(--color-text-muted);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-block {
    display: flex;
    width: 100%;
}

/* Badges */
.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}
.badge-new { background-color: #dbeafe; color: var(--color-primary); }
.badge-hot { background-color: #fee2e2; color: var(--color-danger); }
.badge-free { background-color: #d1fae5; color: var(--color-secondary); }

/* Cards */
.card {
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition-normal);
}
.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.card-img {
    height: 200px;
    width: 100%;
    object-fit: cover;
    background-color: #e2e8f0; /* Placeholder color */
}

.card-body {
    padding: var(--spacing-lg);
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-main);
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.card-price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

/* Navbar */
.navbar {
    background-color: var(--color-bg-card);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: var(--spacing-md) 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
    font-family: var(--font-heading);
}

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

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    font-weight: 500;
    color: var(--color-text-muted);
}
.nav-link:hover, .nav-link.active {
    color: var(--color-primary);
}

.mobile-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Footer */
.footer {
    background-color: #1e293b;
    color: #f8fafc;
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-xxl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
}

.footer-col h4 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: #94a3b8;
}
.footer-links a:hover {
    color: white;
}

/* =========================================
   4. RESPONSIVE QUERIES
   ========================================= */
@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
    
    .grid-cols-4 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .grid-cols-4, .grid-cols-3 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    
    .mobile-toggle { display: block; }
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--color-bg-card);
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
    }
    .nav-menu.active { display: flex; }
}

@media (max-width: 480px) {
    .grid-cols-2 { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
}