/* ===== CSS Variables & Reset ===== */
:root {
    /* 70-20-10 色彩规则 - 温暖家居风格 */
    --primary: #2C3E50;        /* 深蓝灰 - 70% */
    --primary-light: #34495E;
    --secondary: #E8D5C4;      /* 温暖米色 - 20% */
    --secondary-light: #F5E6D3;
    --accent: #E67E22;         /* 活力橙 - 10% */
    --accent-hover: #D35400;
    
    --background: #FDF8F3;     /* 温暖的米白背景 */
    --background-alt: #FFFFFF;
    --text-primary: #2C3E50;
    --text-secondary: #5D6D7E;
    --text-muted: #95A5A6;
    
    --border: #E8D5C4;
    --shadow: rgba(44, 62, 80, 0.08);
    --shadow-hover: rgba(44, 62, 80, 0.15);
    
    /* 字体 */
    --font-display: 'Playfair Display', serif;
    --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

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

a {
    text-decoration: none;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(253, 248, 243, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: var(--transition-normal);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary);
}

.logo-icon {
    font-size: 1.75rem;
}

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

.nav-link {
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-fast);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition-normal);
}

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

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

.search-btn,
.cart-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: var(--transition-fast);
    position: relative;
}

.search-btn:hover,
.cart-btn:hover {
    background: var(--secondary);
}

.cart-count {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 18px;
    height: 18px;
    background: var(--accent);
    color: white;
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-menu-btn {
    display: none;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
}

/* Search Bar */
.search-bar {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--background-alt);
    padding: var(--spacing-sm) var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    border-bottom: 1px solid var(--border);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-normal);
}

.search-bar.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.search-bar input {
    flex: 1;
    padding: var(--spacing-sm);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    outline: none;
    transition: var(--transition-fast);
}

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

/* Mobile Menu */
.mobile-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--background-alt);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    border-bottom: 1px solid var(--border);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-normal);
    z-index: 999;
}

.mobile-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.mobile-menu a {
    padding: var(--spacing-sm);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.mobile-menu a:hover {
    background: var(--secondary);
}

/* Cart Sidebar */
.cart-sidebar {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    max-width: 100%;
    height: 100vh;
    background: var(--background-alt);
    box-shadow: -4px 0 20px var(--shadow);
    z-index: 1100;
    transition: var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.cart-sidebar.active {
    right: 0;
}

.cart-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.cart-header h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
}

.cart-header button {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: var(--transition-fast);
}

.cart-header button:hover {
    background: var(--secondary);
}

.cart-items {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.empty-cart {
    text-align: center;
    color: var(--text-muted);
    padding: var(--spacing-xl);
}

.cart-item {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    background: var(--background);
    margin-bottom: var(--spacing-sm);
}

.cart-item img {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: var(--radius-sm);
}

.cart-item-info {
    flex: 1;
}

.cart-item-name {
    font-weight: 500;
    margin-bottom: 4px;
}

.cart-item-price {
    color: var(--accent);
    font-weight: 600;
}

.cart-item-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
}

.cart-item-actions button {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    background: var(--background-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: var(--transition-fast);
}

.cart-item-actions button:hover {
    background: var(--secondary);
}

.cart-item-remove {
    color: #e74c3c;
    font-size: 0.875rem;
    margin-left: auto;
}

.cart-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border);
    background: var(--background);
}

.cart-total {
    display: flex;
    justify-content: space-between;
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

.cart-total span:last-child {
    font-weight: 700;
    color: var(--accent);
    font-size: 1.25rem;
}

.checkout-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--accent);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.checkout-btn:hover {
    background: var(--accent-hover);
}

.cart-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 1099;
}

.cart-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ===== Main Content ===== */
main {
    padding-top: 80px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--primary);
}

/* ===== Hero Section ===== */
.hero {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    min-height: calc(100vh - 80px);
}

.hero-content {
    padding: var(--spacing-xl);
}

.hero-title {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    color: var(--primary);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.hero-btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--accent);
    color: white;
    font-size: 1.125rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: var(--transition-fast);
    box-shadow: 0 4px 14px rgba(230, 126, 34, 0.4);
}

.hero-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(230, 126, 34, 0.5);
}

.hero-image {
    position: relative;
}

.hero-image img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border-radius: var(--radius-xl);
    box-shadow: 0 20px 60px var(--shadow);
}

.hero-image::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    right: 20px;
    bottom: 20px;
    background: var(--secondary);
    border-radius: var(--radius-xl);
    z-index: -1;
}

/* ===== Categories Section ===== */
.categories {
    padding: var(--spacing-2xl) var(--spacing-lg);
    background: linear-gradient(135deg, var(--background) 0%, var(--secondary-light) 100%);
}

.category-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--spacing-md);
}

.category-card {
    background: var(--background-alt);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    cursor: pointer;
    transition: var(--transition-normal);
    border: 2px solid transparent;
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: 0 8px 30px var(--shadow-hover);
}

.category-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.category-card span {
    font-weight: 500;
    color: var(--text-primary);
}

/* ===== Products Section ===== */
.products {
    padding: var(--spacing-2xl) var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.products-header {
    margin-bottom: var(--spacing-xl);
}

.filter-tags {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-top: var(--spacing-lg);
}

.filter-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--background);
    border: 2px solid var(--border);
    transition: var(--transition-fast);
}

.filter-tag:hover,
.filter-tag.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.product-card {
    background: var(--background-alt);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-normal);
    border: 1px solid var(--border);
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px var(--shadow-hover);
}

.product-image {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
}

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

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

.product-badge {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    padding: 4px 12px;
    background: var(--accent);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
}

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

.product-category {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.product-name {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.product-price {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

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

.price-original {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-decoration: line-through;
}

.add-to-cart {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--primary);
    color: white;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.add-to-cart:hover {
    background: var(--primary-light);
}

/* ===== About Section ===== */
.about {
    padding: var(--spacing-2xl) var(--spacing-lg);
    background: var(--primary);
    color: white;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about .section-title {
    color: white;
}

.about p {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-xl);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.stat {
    text-align: center;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent);
    display: block;
}

.stat-label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.7);
}

/* ===== Footer ===== */
.footer {
    background: var(--primary);
    color: white;
    padding: var(--spacing-2xl) var(--spacing-lg) var(--spacing-lg);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
}

.footer-section a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-xs);
    transition: var(--transition-fast);
}

.footer-section a:hover {
    color: var(--accent);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
}

/* ===== Product Modal ===== */
.product-modal,
.checkout-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 1200;
}

.product-modal.active,
.checkout-modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--background-alt);
    border-radius: var(--radius-xl);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    position: relative;
    transform: scale(0.95);
    transition: var(--transition-normal);
}

.product-modal.active .modal-content,
.checkout-modal.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--background);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    z-index: 10;
    transition: var(--transition-fast);
}

.modal-close:hover {
    background: var(--secondary);
}

.modal-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-image {
    aspect-ratio: 1;
}

.modal-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.modal-info {
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
}

.modal-category {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

.modal-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.modal-price {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: var(--spacing-md);
}

.modal-description {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    flex: 1;
}

.modal-features {
    margin-bottom: var(--spacing-lg);
}

.modal-features h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.modal-features ul {
    list-style: none;
}

.modal-features li {
    padding: 4px 0;
    color: var(--text-secondary);
}

.modal-features li::before {
    content: '✓';
    color: var(--accent);
    font-weight: bold;
    margin-right: var(--spacing-xs);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.quantity-selector {
    display: flex;
    align-items: center;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
}

.quantity-selector button {
    width: 44px;
    height: 44px;
    font-size: 1.25rem;
    transition: var(--transition-fast);
}

.quantity-selector button:hover {
    background: var(--secondary);
}

.quantity-selector span {
    width: 50px;
    text-align: center;
    font-weight: 600;
}

.modal-add-cart {
    flex: 1;
    padding: var(--spacing-md);
    background: var(--accent);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.modal-add-cart:hover {
    background: var(--accent-hover);
}

/* Checkout Modal */
.checkout-content {
    padding: var(--spacing-xl);
    max-height: 90vh;
    overflow-y: auto;
}

.checkout-content h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    margin-bottom: var(--spacing-lg);
}

.checkout-summary {
    background: var(--background);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.checkout-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--border);
}

.checkout-item:last-child {
    border-bottom: none;
    font-weight: 700;
    font-size: 1.125rem;
    padding-top: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    border-top: 2px solid var(--border);
}

.checkout-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    padding: var(--spacing-sm);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
}

.submit-order-btn {
    padding: var(--spacing-md);
    background: var(--accent);
    color: white;
    font-size: 1.125rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    margin-top: var(--spacing-sm);
    transition: var(--transition-fast);
}

.submit-order-btn:hover {
    background: var(--accent-hover);
}

/* ===== Responsive Design ===== */
@media (max-width: 1200px) {
    .product-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .category-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 992px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        order: 2;
    }
    
    .hero-image {
        order: 1;
    }
    
    .hero-image img {
        height: 350px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .modal-body {
        grid-template-columns: 1fr;
    }
    
    .modal-image {
        aspect-ratio: 16/9;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .cart-sidebar {
        width: 100%;
        right: -100%;
    }
}

@media (max-width: 480px) {
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-tags {
        gap: var(--spacing-xs);
    }
    
    .filter-tag {
        padding: 6px 12px;
        font-size: 0.875rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-image img {
        height: 280px;
    }
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.product-card {
    animation: fadeIn 0.5s ease forwards;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-weight: 500;
    opacity: 0;
    transition: var(--transition-normal);
    z-index: 1300;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}