/* ========================================
   扬州佳沃木业有限公司 - 官网样式
   Design System: Industrial Blue + Wood Tones + White
   ======================================== */

/* CSS Custom Properties */
:root {
    /* Primary Colors */
    --color-primary: #2C5282;
    --color-primary-dark: #1A365D;
    --color-primary-light: #4299E1;
    
    /* Wood Tones */
    --color-wood: #8B4513;
    --color-wood-light: #A0522D;
    --color-wood-dark: #654321;
    
    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-gray-50: #F7FAFC;
    --color-gray-100: #EDF2F7;
    --color-gray-200: #E2E8F0;
    --color-gray-300: #CBD5E0;
    --color-gray-600: #718096;
    --color-gray-800: #2D3748;
    --color-gray-900: #1A202C;
    
    /* Semantic Colors */
    --color-success: #48BB78;
    --color-error: #F56565;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --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: 300ms ease;
    
    /* Container */
    --container-max: 1200px;
    --header-height: 70px;
}

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

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
}

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

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

ul {
    list-style: none;
}

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

/* ========================================
   Header Styles
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo a {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-primary);
}

.nav-list {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    font-size: var(--font-size-base);
    color: var(--color-gray-800);
    padding: var(--spacing-sm) 0;
    position: relative;
}

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

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

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

.header-contact {
    display: flex;
    align-items: center;
}

.phone-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-primary);
    font-weight: 600;
}

.phone-link:hover {
    color: var(--color-primary-dark);
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    min-width: 44px;
    min-height: 44px;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-gray-800);
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--color-gray-800);
    left: 0;
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    top: 8px;
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    padding-top: var(--header-height);
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: url('../image/bg.jpeg') center/cover no-repeat;
    opacity: 0.15;
}

.hero-content {
    position: relative;
    text-align: center;
    color: var(--color-white);
    padding: var(--spacing-2xl) var(--spacing-md);
}

.hero-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
}

.feature-pill {
    background-color: rgba(255, 255, 255, 0.2);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 50px;
    font-size: var(--font-size-sm);
    backdrop-filter: blur(4px);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
    min-height: 44px;
    min-width: 44px;
}

.btn-primary {
    background-color: var(--color-wood);
    color: var(--color-white);
    border-color: var(--color-wood);
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
}

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

.btn-full {
    width: 100%;
}

/* ========================================
   Section Common Styles
   ======================================== */
section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
}

/* ========================================
   Products Section
   ======================================== */
.products {
    background-color: var(--color-gray-50);
}

.product-category {
    margin-bottom: var(--spacing-2xl);
}

.category-title {
    font-size: var(--font-size-2xl);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary);
    display: inline-block;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.product-card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.product-image {
    height: 280px;
    overflow: hidden;
    background-color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform var(--transition-normal);
}

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

.product-info {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-gray-200);
}

.product-name {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
}

.product-name-en {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
}

.product-features {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.feature-tag {
    background-color: var(--color-primary-light);
    color: var(--color-white);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.product-desc {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.product-usage {
    font-size: var(--font-size-sm);
    color: var(--color-gray-800);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-gray-200);
}

.product-usage strong {
    color: var(--color-wood);
}

/* ========================================
   Advantages Section
   ======================================== */
.advantages {
    background-color: var(--color-white);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.advantage-card {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--color-gray-50);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-normal);
}

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

.advantage-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.advantage-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
}

.advantage-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.advantage-desc {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    line-height: 1.7;
}

/* ========================================
   About Section
   ======================================== */
.about {
    background-color: var(--color-gray-50);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.about-text p {
    margin-bottom: var(--spacing-lg);
    color: var(--color-gray-600);
    line-height: 1.8;
}

.about-text p:first-child::first-letter {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-primary);
    float: left;
    margin-right: var(--spacing-sm);
    line-height: 1;
}

.about-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

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

/* ========================================
   Contact Section
   ======================================== */
.contact {
    background-color: var(--color-white);
}

.contact-content {
    max-width: 900px;
    margin: 0 auto;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    background-color: var(--color-gray-50);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-fast);
}

.contact-item:hover {
    transform: translateY(-2px);
}

/* 联系电话占2格 */
.contact-item-wide {
    grid-column: span 2;
}

/* 电话号码并排显示 */
.phone-numbers {
    display: flex;
    gap: var(--spacing-xl);
}

.contact-icon {
    font-size: 2rem;
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    border-radius: 50%;
    color: var(--color-white);
}

.contact-detail h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-xs);
}

.contact-detail p {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.contact-detail a {
    color: var(--color-primary);
}

.contact-detail a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

.contact-cta {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
    min-width: 200px;
}

/* Contact Form */
.contact-form-wrapper {
    background-color: var(--color-gray-50);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
}

.contact-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-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-gray-800);
}

.form-group input,
.form-group textarea {
    padding: var(--spacing-md);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    min-height: 44px;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(44, 82, 130, 0.1);
}

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

.form-feedback {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    display: none;
}

.form-feedback.success {
    display: block;
    background-color: rgba(72, 187, 120, 0.1);
    color: var(--color-success);
}

.form-feedback.error {
    display: block;
    background-color: rgba(245, 101, 101, 0.1);
    color: var(--color-error);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background-color: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--spacing-xl) 0;
}

.footer-content {
    text-align: center;
}

.copyright {
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-sm);
}

.footer-contact {
    font-size: var(--font-size-sm);
}

.footer-contact a {
    color: var(--color-gray-300);
}

.footer-contact a:hover {
    color: var(--color-white);
}

.footer-contact .divider {
    margin: 0 var(--spacing-md);
    opacity: 0.5;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 992px) {
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        order: -1;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }
    
    .nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--color-white);
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-list {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .nav-link {
        display: block;
        padding: var(--spacing-md);
        text-align: center;
    }
    
    .header-contact {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-base);
    }
    
    .section-title {
        font-size: var(--font-size-2xl);
    }
    
    .product-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-features {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .footer-contact .divider {
        display: none;
    }
    
    .footer-contact {
        display: flex;
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}