/* American Family Meals - Minimal Gray Theme */

:root {
    /* 极简灰配色方案 - Minimal Gray Palette */
    --primary-color: #4a4a4a;
    --primary-dark: #2c2c2c;
    --primary-light: #e8e8e8;
    --secondary-color: #7d7d7d;
    --accent-color: #5c8a8a;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-dark: #2c2c2c;
    
    --text-primary: #2c2c2c;
    --text-secondary: #6b6b6b;
    --text-light: #ffffff;
    
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.08);
    
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    
    --border-radius: 4px;
    --border-radius-lg: 8px;
    --transition: all 0.25s ease;
}

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

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

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

/* Header */
.site-header {
    background: var(--bg-primary);
    box-shadow: 0 1px 3px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon {
    font-size: 1.8rem;
}

.logo h1 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    color: var(--text-primary);
    font-weight: 600;
    letter-spacing: -0.5px;
}

.main-nav {
    display: flex;
    gap: 35px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 400;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

.header-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn-search, .btn-login {
    padding: 8px 16px;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: var(--transition);
}

.btn-search {
    background: transparent;
    color: var(--text-secondary);
    font-size: 1.1rem;
    padding: 6px;
}

.btn-login {
    background: var(--primary-color);
    color: var(--text-light);
    font-weight: 500;
    padding: 8px 20px;
}

.btn-login:hover {
    background: var(--primary-dark);
}

/* Hero Section */
.hero {
    background: var(--bg-secondary);
    padding: 100px 0;
    text-align: center;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 2.8rem;
    color: var(--text-primary);
    margin-bottom: 16px;
    font-weight: 300;
    letter-spacing: -1px;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-weight: 400;
}

.hero-search {
    display: flex;
    max-width: 550px;
    margin: 0 auto 30px;
    gap: 0;
    box-shadow: 0 2px 8px var(--shadow-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.search-input {
    flex: 1;
    padding: 16px 20px;
    border: 1px solid var(--border-color);
    border-right: none;
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
    background: var(--bg-primary);
}

.search-input:focus {
    border-color: var(--secondary-color);
}

.btn-primary {
    padding: 16px 28px;
    background: var(--primary-color);
    color: var(--text-light);
    border: none;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.hero-tags {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.tag {
    padding: 8px 18px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.tag:hover {
    background: var(--primary-color);
    color: var(--text-light);
    border-color: var(--primary-color);
}

/* Categories Section */
.categories {
    padding: 70px 0;
    background: var(--bg-primary);
}

.section-title {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    text-align: center;
    margin-bottom: 40px;
    color: var(--text-primary);
    font-weight: 300;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 20px;
}

.category-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    padding: 35px 20px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}

.category-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-color);
    box-shadow: 0 4px 12px var(--shadow-color);
}

.category-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.category-card h4 {
    font-size: 0.95rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* Recipes Section */
.recipes {
    padding: 70px 0;
    background: var(--bg-secondary);
}

.recipe-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 25px;
}

.recipe-card {
    background: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: 0 2px 8px var(--shadow-color);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.recipe-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px var(--shadow-color);
}

.recipe-image {
    width: 100%;
    height: 180px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3.5rem;
}

.recipe-content {
    padding: 18px;
}

.recipe-title {
    font-size: 1.05rem;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-weight: 500;
}

.recipe-meta {
    display: flex;
    gap: 12px;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.recipe-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.recipe-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.recipe-tag {
    padding: 3px 8px;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border-radius: 3px;
    font-size: 0.75rem;
}

.load-more {
    text-align: center;
    margin-top: 40px;
}

.btn-secondary {
    padding: 12px 28px;
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 400;
}

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

/* Features Section */
.features {
    padding: 70px 0;
    background: var(--bg-primary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 25px;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.feature-item h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 500;
}

.feature-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Footer */
.site-footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 35px;
}

.footer-brand .logo-icon {
    font-size: 2rem;
}

.footer-brand h4 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    margin: 8px 0;
    color: var(--text-light);
    font-weight: 500;
}

.footer-brand p {
    color: #999;
    line-height: 1.6;
    font-size: 0.9rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.link-group h5 {
    font-size: 0.9rem;
    margin-bottom: 12px;
    color: var(--text-light);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.link-group a {
    display: block;
    color: #999;
    text-decoration: none;
    margin-bottom: 8px;
    transition: var(--transition);
    font-size: 0.9rem;
}

.link-group a:hover {
    color: var(--text-light);
}

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 20px;
    text-align: center;
    color: #777;
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
    .main-nav {
        display: none;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-search {
        flex-direction: column;
        border-radius: var(--border-radius);
    }
    
    .search-input {
        border-right: 1px solid var(--border-color);
        border-bottom: none;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .logo h1 {
        font-size: 1.2rem;
    }
}