/* CastnFish.com Core Design System */
:root {
    /* Brand Colors */
    --primary: #0d2f4f;
    --secondary: #1a75bb;
    --accent: #f4a261;
    --success: #2ecc71;
    --warning: #f1c40f;
    --danger: #e74c3c;
    
    /* Typography Colors */
    --text-primary: #2c3e50;
    --text-secondary: #34495e;
    --text-light: #7f8c8d;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #e9ecef;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Container Widths */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    
    /* Z-index layers */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-tooltip: 400;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
}

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

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

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2vw, 1.75rem); }
h5 { font-size: clamp(1.125rem, 1.5vw, 1.5rem); }
h6 { font-size: clamp(1rem, 1.25vw, 1.25rem); }

p { margin-bottom: var(--spacing-md); }

/* Layout */
.container {
    width: 100%;
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

/* Grid System */
.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); }

@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 768px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    z-index: var(--z-sticky);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 4rem;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--secondary);
}

/* Mobile Navigation */
.nav-toggle {
    display: none;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        padding: var(--spacing-md);
        box-shadow: var(--shadow-md);
    }
    
    .nav-menu.active {
        display: flex;
        flex-direction: column;
    }
}

/* Search Bar */
.search-container {
    position: relative;
    max-width: var(--container-md);
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--secondary);
}

.search-button {
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
}

/* Hero Section */
.hero {
    padding: calc(4rem + var(--spacing-xxl)) 0 var(--spacing-xxl);
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--bg-primary);
    text-align: center;
}

.hero-content {
    max-width: var(--container-md);
    margin: 0 auto;
}

.hero h1 {
    color: var(--bg-primary);
    margin-bottom: var(--spacing-lg);
}

/* Quick Navigation */
.quick-nav {
    background: var(--bg-secondary);
    padding: var(--spacing-xl) 0;
}

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

.quick-nav-item {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal);
}

.quick-nav-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Featured Products */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.product-card {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: transform var(--transition-normal);
}

.product-card:hover {
    transform: translateY(-4px);
}

.product-image {
    aspect-ratio: 16/9;
    object-fit: cover;
}

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

.product-title {
    margin-bottom: var(--spacing-xs);
}

.product-price {
    color: var(--secondary);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

/* Newsletter */
.newsletter {
    background: var(--primary);
    color: var(--bg-primary);
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.newsletter-form {
    max-width: var(--container-sm);
    margin: var(--spacing-lg) auto 0;
    display: flex;
    gap: var(--spacing-sm);
}

.newsletter-input {
    flex: 1;
    padding: var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
}

.newsletter-button {
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--accent);
    color: var(--primary);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: opacity var(--transition-fast);
}

.newsletter-button:hover {
    opacity: 0.9;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: var(--spacing-xxl) 0;
}

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

.footer-title {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
}

.footer-link {
    color: var(--text-light);
    text-decoration: none;
    display: block;
    padding: var(--spacing-xs) 0;
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--secondary);
}

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

.mt-1 { margin-top: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-lg); }
.mt-3 { margin-top: var(--spacing-xl); }
.mt-4 { margin-top: var(--spacing-xxl); }

.mb-1 { margin-bottom: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-lg); }
.mb-3 { margin-bottom: var(--spacing-xl); }
.mb-4 { margin-bottom: var(--spacing-xxl); }

.hidden { display: none; }

@media (max-width: 768px) {
    .md\:hidden { display: none; }
}

@media (max-width: 640px) {
    .sm\:hidden { display: none; }
}