/* ========================================
   青禾计划官网 - 全新设计样式表
   现代简约 + 中国传统美学
   ======================================== */

/* ===== 1. CSS 变量定义 ===== */
:root {
    /* 主色调 - 水墨渐变 */
    --primary-dark: #1a1a1a;
    --primary-medium: #2d2d2d;
    --primary-light: #4a4a4a;
    
    /* 背景色 - 宣纸质感 */
    --bg-primary: #fafaf8;
    --bg-secondary: #f5f5f0;
    --bg-tertiary: #eeede8;
    
    /* 强调色 - 传统色彩 */
    --accent-green: #2e7d32;
    --accent-gold: #c9a961;
    --accent-jade: #4a9b8e;
    --accent-red: #d32f2f;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #2e7d32 0%, #4a9b8e 100%);
    --gradient-secondary: linear-gradient(135deg, #1a1a1a 0%, #4a4a4a 100%);
    --gradient-gold: linear-gradient(135deg, #c9a961 0%, #d4af37 100%);
    --gradient-hero: linear-gradient(135deg, rgba(46, 125, 50, 0.05) 0%, rgba(74, 155, 142, 0.05) 100%);
    
    /* 文字颜色 */
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-tertiary: #6b6b6b;
    --text-light: #8a8a8a;
    
    /* 边框颜色 */
    --border-light: #e8e8e0;
    --border-medium: #d1d1c8;
    --border-dark: #a8a89f;
    
    /* 间距系统 */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    --space-3xl: 6rem;
    --space-4xl: 8rem;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);
    
    /* 过渡动画 */
    --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 字体 */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Noto Serif SC', serif;
    
    /* Z-index */
    --z-base: 1;
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1050;
}

/* ===== 2. 基础重置 ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}

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

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

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

ul, ol {
    list-style: none;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ===== 3. 背景装饰元素 ===== */
.bg-decoration {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.ink-circle {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(46, 125, 50, 0.03) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

.ink-circle-1 {
    width: 600px;
    height: 600px;
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.ink-circle-2 {
    width: 800px;
    height: 800px;
    bottom: -300px;
    left: -300px;
    animation-delay: 5s;
    background: radial-gradient(circle, rgba(74, 155, 142, 0.03) 0%, transparent 70%);
}

.ink-circle-3 {
    width: 400px;
    height: 400px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 10s;
    background: radial-gradient(circle, rgba(201, 169, 97, 0.02) 0%, transparent 70%);
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

/* ===== 4. 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(250, 250, 248, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(250, 250, 248, 0.95);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: var(--space-xs) 0;
}

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

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

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

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

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--accent-green);
    transform: rotate(15deg);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 30px;
    height: 30px;
    cursor: pointer;
}

.mobile-toggle span {
    width: 100%;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* ===== 5. 首屏英雄区 ===== */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-hero);
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(46,125,50,0.03)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
}

.hero-content-wrapper {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    align-items: center;
}

.hero-content {
    animation: fadeInUp 1s ease-out;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    background: rgba(46, 125, 50, 0.1);
    border: 1px solid rgba(46, 125, 50, 0.2);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-lg);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

.badge-text {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--accent-green);
}

.hero-title {
    font-size: 4rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
}

.title-line {
    display: block;
}

.title-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--space-2xl);
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    margin-bottom: var(--space-3xl);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-primary i {
    transition: transform var(--transition-base);
}

.btn-primary:hover i {
    transform: translateX(4px);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-medium);
}

.btn-outline:hover {
    background: var(--bg-secondary);
    border-color: var(--accent-green);
    color: var(--accent-green);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.stat-icon {
    width: 50px;
    height: 50px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-green);
    font-size: 1.25rem;
}

.stat-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.stat-content p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

/* 英雄区视觉元素 */
.hero-visual {
    position: relative;
    height: 600px;
}

.visual-container {
    position: relative;
    width: 100%;
    height: 100%;
}

.floating-card {
    position: absolute;
    background: white;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    animation: floatCard 6s ease-in-out infinite;
}

.floating-card i {
    font-size: 2rem;
    color: var(--accent-green);
}

.floating-card span {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-1 {
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.card-2 {
    top: 50%;
    right: 10%;
    animation-delay: 2s;
}

.card-3 {
    bottom: 10%;
    left: 20%;
    animation-delay: 4s;
}

.center-graphic {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.graphic-circle {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid var(--accent-green);
    border-radius: 50%;
    opacity: 0.2;
    animation: rotate 20s linear infinite;
}

.center-graphic i {
    font-size: 5rem;
    color: var(--accent-green);
    animation: pulse 3s ease-in-out infinite;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    color: var(--text-tertiary);
    font-size: 0.875rem;
    animation: bounce 2s ease-in-out infinite;
}

/* ===== 6. 通用区块样式 ===== */
section {
    position: relative;
    padding: var(--space-4xl) 0;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section-tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: rgba(46, 125, 50, 0.1);
    color: var(--accent-green);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===== 7. 关于我们区块 ===== */
.about-section {
    background: var(--bg-secondary);
}

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

.about-card {
    background: white;
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    margin-bottom: var(--space-lg);
}

.card-content h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
}

.card-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-secondary);
}

.feature-list i {
    color: var(--accent-green);
    font-size: 0.875rem;
}

/* 核心价值观 */
.core-values {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.value-item {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-xl);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.value-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(8px);
}

.value-number {
    font-size: 3rem;
    font-weight: 900;
    font-family: var(--font-serif);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.3;
}

.value-content h4 {
    font-size: 1.25rem;
    margin-bottom: var(--space-xs);
}

.value-content p {
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* ===== 8. 核心理念区块 ===== */
.philosophy-section {
    background: var(--bg-primary);
}

.philosophy-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-2xl);
}

.philosophy-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.philosophy-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.card-header {
    padding: var(--space-xl);
    background: var(--gradient-hero);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-icon-wrapper {
    width: 60px;
    height: 60px;
    background: white;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-green);
    font-size: 1.5rem;
}

.card-number {
    font-size: 2rem;
    font-weight: 900;
    font-family: var(--font-serif);
    color: var(--text-light);
}

.card-body {
    padding: var(--space-xl);
}

.card-body h3 {
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
}

.card-body p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.card-footer {
    padding: 0 var(--space-xl) var(--space-xl);
    display: flex;
    gap: var(--space-sm);
}

.card-tag {
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
}

/* ===== 9. 文化传承区块 ===== */
.culture-section {
    background: var(--bg-secondary);
}

.culture-timeline {
    max-width: 900px;
    margin: 0 auto;
}

.timeline-item {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: var(--space-2xl);
    margin-bottom: var(--space-3xl);
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.marker-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 2;
}

.marker-line {
    width: 3px;
    flex: 1;
    background: linear-gradient(to bottom, var(--accent-green), transparent);
    margin-top: var(--space-md);
}

.timeline-content {
    background: white;
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.timeline-content:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
}

.timeline-badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-md);
    background: rgba(46, 125, 50, 0.1);
    color: var(--accent-green);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.timeline-content h3 {
    font-size: 1.75rem;
    margin-bottom: var(--space-xs);
}

.timeline-subtitle {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    margin-bottom: var(--space-md);
}

.timeline-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

.timeline-tags {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.timeline-tags span {
    padding: var(--space-xs) var(--space-md);
    background: var(--bg-secondary);
    color: var(--text-secondary);
    font-size: 0.75rem;
    border-radius: var(--radius-full);
}

/* ===== 10. 联系我们区块 ===== */
.contact-section {
    background: var(--bg-primary);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--space-3xl);
}

.contact-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.info-card {
    background: white;
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

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

.info-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-hero);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-green);
    font-size: 1.25rem;
    margin-bottom: var(--space-md);
}

.info-content h4 {
    font-size: 1rem;
    margin-bottom: var(--space-sm);
}

.info-content p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    line-height: 1.6;
}

.contact-form-wrapper {
    background: white;
    padding: var(--space-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.form-header {
    margin-bottom: var(--space-xl);
}

.form-header h3 {
    font-size: 1.75rem;
    margin-bottom: var(--space-sm);
}

.form-header p {
    color: var(--text-secondary);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

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

.form-group label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    padding: var(--space-md);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== 11. 页脚 ===== */
.footer {
    background: var(--primary-dark);
    color: white;
}

.footer-top {
    padding: var(--space-4xl) 0 var(--space-3xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--space-3xl);
}

.footer-brand {
    max-width: 350px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.footer-logo .logo-icon {
    background: var(--gradient-primary);
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

.footer-social {
    display: flex;
    gap: var(--space-sm);
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--accent-green);
    transform: translateY(-2px);
}

.footer-col h4 {
    font-size: 1.125rem;
    margin-bottom: var(--space-lg);
    color: white;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    color: white;
    padding-left: var(--space-xs);
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
}

.footer-contact i {
    color: var(--accent-green);
    margin-top: 2px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--space-xl) 0;
}

.footer-bottom-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.5);
    transition: color var(--transition-fast);
}

.footer-bottom a:hover {
    color: white;
}

/* ===== 12. 返回顶部按钮 ===== */
.back-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-fixed);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* ===== 13. 动画定义 ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.1);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-10px);
    }
}

@keyframes floatCard {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* AOS 动画效果 */
[data-aos] {
    opacity: 0;
    transition: all 0.8s ease-out;
}

[data-aos="fade-up"] {
    transform: translateY(30px);
}

[data-aos="fade-down"] {
    transform: translateY(-30px);
}

[data-aos="fade-left"] {
    transform: translateX(30px);
}

[data-aos="fade-right"] {
    transform: translateX(-30px);
}

[data-aos="zoom-in"] {
    transform: scale(0.9);
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translate(0) scale(1);
}

/* ===== 14. 响应式设计 ===== */

/* 大屏幕 (1440px+) */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }

    .hero-title {
        font-size: 4.5rem;
    }

    .section-title {
        font-size: 3.5rem;
    }
}

/* 平板横屏 (1024px - 1439px) */
@media (max-width: 1439px) {
    .hero-title {
        font-size: 3.5rem;
    }

    .section-title {
        font-size: 2.5rem;
    }
}

/* 平板竖屏 (768px - 1023px) */
@media (max-width: 1023px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: var(--space-lg);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }

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

    .mobile-toggle {
        display: flex;
    }

    .hero-content-wrapper {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

    .hero-visual {
        height: 400px;
    }

    .hero-title {
        font-size: 3rem;
    }

    .about-grid,
    .philosophy-grid {
        grid-template-columns: 1fr;
    }

    .core-values {
        grid-template-columns: 1fr;
    }

    .contact-wrapper {
        grid-template-columns: 1fr;
    }

    .contact-info-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 手机 (< 768px) */
@media (max-width: 767px) {
    .container {
        padding: 0 var(--space-md);
    }

    .nav-container {
        padding: 0 var(--space-md);
        height: 70px;
    }

    .nav-logo {
        font-size: 1.25rem;
    }

    .logo-icon {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }

    .hero-section {
        min-height: auto;
        padding: var(--space-4xl) 0;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .hero-stats {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        display: none;
    }

    .section-title {
        font-size: 2rem;
    }

    .section-subtitle {
        font-size: 1rem;
    }

    .timeline-item {
        grid-template-columns: 60px 1fr;
        gap: var(--space-lg);
    }

    .marker-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    .contact-info-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .footer-bottom-content {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
}

/* ===== 15. 深色模式 ===== */
body.dark-mode {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #fafaf8;
    --text-secondary: #d1d1c8;
    --text-tertiary: #a8a89f;
    --text-light: #808077;
    --border-light: #3a3a3a;
    --border-medium: #4a4a4a;
    --border-dark: #5e5e56;
}

body.dark-mode .navbar {
    background: rgba(26, 26, 26, 0.8);
    border-bottom-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .navbar.scrolled {
    background: rgba(26, 26, 26, 0.95);
}

body.dark-mode .hero-background {
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 100%);
}

body.dark-mode .about-card,
body.dark-mode .philosophy-card,
body.dark-mode .timeline-content,
body.dark-mode .info-card,
body.dark-mode .contact-form-wrapper,
body.dark-mode .value-item {
    background: var(--bg-secondary);
}

body.dark-mode .theme-toggle {
    background: var(--bg-tertiary);
}

body.dark-mode .theme-toggle i::before {
    content: "\f185"; /* sun icon */
}

/* ===== 16. 打印样式 ===== */
@media print {
    .navbar,
    .hero-visual,
    .back-to-top,
    .theme-toggle,
    .mobile-toggle,
    .footer-social {
        display: none !important;
    }

    body {
        background: white;
        color: black;
    }

    section {
        page-break-inside: avoid;
    }
}

/* ===== 17. 辅助功能 ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* 聚焦样式 */
*:focus-visible {
    outline: 2px solid var(--accent-green);
    outline-offset: 2px;
}

/* 减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===== 18. 实用工具类 ===== */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.pt-sm { padding-top: var(--space-sm); }
.pt-md { padding-top: var(--space-md); }
.pt-lg { padding-top: var(--space-lg); }
.pt-xl { padding-top: var(--space-xl); }

.pb-sm { padding-bottom: var(--space-sm); }
.pb-md { padding-bottom: var(--space-md); }
.pb-lg { padding-bottom: var(--space-lg); }
.pb-xl { padding-bottom: var(--space-xl); }

.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

/* ===== 结束 ===== */