/* ====================================
   南京零信科技有限公司 - 官网样式
   主题：浅色清新风，传达信任与专业
   ==================================== */

/* CSS 变量 */
:root {
    /* 主色调 - 采用蓝绿色系，象征信任与科技 */
    --primary-50: #ecfeff;
    --primary-100: #cffafe;
    --primary-200: #a5f3fc;
    --primary-300: #67e8f9;
    --primary-400: #22d3ee;
    --primary-500: #06b6d4;
    --primary-600: #0891b2;
    --primary-700: #0e7490;
    --primary-800: #155e75;
    --primary-900: #164e63;
    
    /* 强调色 - 珊瑚橙色，温暖而有活力 */
    --accent-100: #ffedd5;
    --accent-200: #fed7aa;
    --accent-300: #fdba74;
    --accent-400: #fb923c;
    --accent-500: #f97316;
    --accent-600: #ea580c;
    
    /* 中性色 */
    --neutral-50: #fafafa;
    --neutral-100: #f5f5f5;
    --neutral-200: #e5e5e5;
    --neutral-300: #d4d4d4;
    --neutral-400: #a3a3a3;
    --neutral-500: #737373;
    --neutral-600: #525252;
    --neutral-700: #404040;
    --neutral-800: #262626;
    --neutral-900: #171717;
    
    /* 背景色 - 浅色系 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    
    /* 文字色 */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    /* 边框色 */
    --border-color: #e2e8f0;
    --border-hover: #cbd5e1;
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-700) 100%);
    --gradient-accent: linear-gradient(135deg, var(--accent-400) 0%, var(--accent-600) 100%);
    --gradient-light: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    --gradient-hero: linear-gradient(135deg, #ecfeff 0%, #f0fdfa 50%, #f0fdf4 100%);
    
    /* 字体 */
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Outfit', 'Noto Sans SC', sans-serif;
    
    /* 间距 */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 阴影 - 浅色主题适配 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 40px rgba(6, 182, 212, 0.12);
    --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    
    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* 重置样式 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul, ol {
    list-style: none;
}

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

/* 容器 */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* ====================================
   导航栏
   ==================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-4) 0;
    transition: all var(--transition-base);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-3) 0;
    box-shadow: var(--shadow-sm);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.brand-text {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.02em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-links a {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    transition: color var(--transition-fast);
    position: relative;
    font-weight: 500;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-500);
    transition: width var(--transition-base);
}

.nav-links a:hover {
    color: var(--primary-600);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ====================================
   英雄区域
   ==================================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    padding: var(--space-24) 0;
    overflow: hidden;
    background: var(--gradient-hero);
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.grid-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(6, 182, 212, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(6, 182, 212, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 70%, transparent 100%);
}

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.3;
}

.glow-1 {
    width: 600px;
    height: 600px;
    background: var(--primary-300);
    top: -200px;
    right: -100px;
    animation: float 15s ease-in-out infinite;
}

.glow-2 {
    width: 400px;
    height: 400px;
    background: var(--accent-300);
    bottom: -100px;
    left: -100px;
    animation: float 12s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: var(--primary-700);
    margin-bottom: var(--space-8);
    animation: fadeInUp 0.6s ease both;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--primary-500);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-6);
    color: var(--text-primary);
}

.title-line {
    display: block;
    animation: fadeInUp 0.6s ease both;
}

.title-line:nth-child(1) {
    animation-delay: 0.1s;
}

.title-line:nth-child(2) {
    animation-delay: 0.2s;
}

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

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-10);
    animation: fadeInUp 0.6s ease 0.3s both;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-16);
    animation: fadeInUp 0.6s ease 0.4s both;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-lg), 0 0 30px rgba(6, 182, 212, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl), 0 0 40px rgba(6, 182, 212, 0.3);
}

.btn-primary svg {
    transition: transform var(--transition-fast);
}

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

.btn-secondary {
    background: white;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

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

.hero-stats {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    animation: fadeInUp 0.6s ease 0.5s both;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-600);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-8);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    color: var(--text-muted);
    font-size: 0.75rem;
    animation: fadeIn 1s ease 1s both;
}

.scroll-arrow {
    width: 20px;
    height: 30px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 2px;
    animation: scrollDown 1.5s infinite;
}

@keyframes scrollDown {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(10px); }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* ====================================
   核心使命
   ==================================== */
.mission {
    padding: var(--space-20) 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.mission-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.mission-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: var(--primary-50);
    border-radius: var(--radius-xl);
    margin-bottom: var(--space-6);
    color: var(--primary-600);
}

.mission-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-4);
    letter-spacing: 0.1em;
    color: var(--text-primary);
}

.mission-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* ====================================
   产品展示
   ==================================== */
.products {
    padding: var(--space-24) 0;
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-16);
}

.section-tag {
    display: inline-block;
    padding: var(--space-1) var(--space-4);
    background: var(--primary-50);
    border: 1px solid var(--primary-100);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    color: var(--primary-700);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-4);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--space-4);
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.section-desc {
    font-size: 1.0625rem;
    color: var(--text-secondary);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
}

.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-2xl);
    padding: var(--space-8);
    position: relative;
    transition: all var(--transition-base);
    opacity: 0;
    transform: translateY(20px);
    box-shadow: var(--shadow-card);
}

.product-card.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.product-card:hover {
    border-color: var(--primary-200);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.product-featured {
    grid-column: span 2;
    background: linear-gradient(135deg, var(--primary-50) 0%, #ffffff 100%);
    border-color: var(--primary-200);
}

.product-coming {
    opacity: 0.9;
}

.product-badge {
    position: absolute;
    top: var(--space-6);
    right: var(--space-6);
    padding: var(--space-1) var(--space-3);
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
}

.badge-shield {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.badge-ai {
    background: var(--gradient-accent);
    color: white;
}

.badge-privacy {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

.badge-dev {
    background: linear-gradient(135deg, #64748b 0%, #475569 100%);
}

.product-header {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.product-logo {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

.product-logo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.product-info {
    flex: 1;
}

.product-name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-1);
    color: var(--text-primary);
}

.product-tagline {
    font-size: 0.9375rem;
    color: var(--primary-600);
}

.product-desc {
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    line-height: 1.7;
}

.product-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.product-features li {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 0.875rem;
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
}

.product-features svg {
    color: var(--primary-500);
    flex-shrink: 0;
}

.product-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--primary-600);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.product-link:hover {
    color: var(--primary-700);
    gap: var(--space-3);
}

.product-qr {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    width: fit-content;
}

.product-qr img {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.product-qr span {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* ====================================
   关于我们
   ==================================== */
.about {
    padding: var(--space-24) 0;
    background: var(--bg-primary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.about-content {
    opacity: 0;
    transform: translateX(-20px);
}

.about-content.animate-in {
    opacity: 1;
    transform: translateX(0);
    transition: all 0.6s ease;
}

.about-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin: var(--space-4) 0 var(--space-8);
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.about-story p {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    line-height: 1.8;
}

.about-story strong {
    color: var(--primary-600);
}

.about-visual {
    opacity: 0;
    transform: translateX(20px);
}

.about-visual.animate-in {
    opacity: 1;
    transform: translateX(0);
    transition: all 0.6s ease 0.2s;
}

.timeline {
    position: relative;
    padding-left: var(--space-10);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary-500) 0%, var(--border-color) 100%);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-10);
    opacity: 0;
    transform: translateY(10px);
}

.timeline-item.animate-in {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.4s ease;
}

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

.timeline-dot {
    position: absolute;
    left: calc(-1 * var(--space-10) + 8px);
    top: 4px;
    width: 16px;
    height: 16px;
    background: white;
    border: 3px solid var(--primary-500);
    border-radius: 50%;
}

.timeline-dot.active {
    background: var(--primary-500);
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.4);
}

.timeline-year {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-600);
    display: block;
    margin-bottom: var(--space-2);
}

.timeline-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ====================================
   价值观
   ==================================== */
.values {
    padding: var(--space-24) 0;
    background: var(--bg-secondary);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
}

.value-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    text-align: center;
    transition: all var(--transition-base);
    opacity: 0;
    transform: translateY(20px);
    box-shadow: var(--shadow-card);
}

.value-card.animate-in {
    opacity: 1;
    transform: translateY(0);
}

.value-card:hover {
    border-color: var(--primary-200);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.value-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--primary-50);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-6);
    color: var(--primary-600);
}

.value-card h3 {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.value-card p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ====================================
   联系我们
   ==================================== */
.contact {
    padding: var(--space-24) 0;
    background: var(--bg-primary);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--space-16);
    align-items: center;
}

.contact-title {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin: var(--space-4) 0 var(--space-6);
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.contact-desc {
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    max-width: 500px;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    color: var(--text-secondary);
}

.contact-item svg {
    color: var(--primary-500);
    flex-shrink: 0;
}

.contact-item strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.contact-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-2xl);
    padding: var(--space-10);
}

.contact-qr {
    text-align: center;
}

.contact-qr img {
    width: 180px;
    height: 180px;
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
    border: 1px solid var(--border-color);
}

.contact-qr p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* ====================================
   页脚
   ==================================== */
.footer {
    padding: var(--space-16) 0 var(--space-8);
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: var(--space-16);
    padding-bottom: var(--space-12);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--space-8);
}

.footer-brand p {
    color: var(--text-muted);
    margin-top: var(--space-4);
    font-size: 0.9375rem;
}

.footer-links {
    display: flex;
    gap: var(--space-16);
}

.footer-col h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: var(--space-4);
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-col a {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    transition: color var(--transition-fast);
}

.footer-col a:hover {
    color: var(--primary-600);
}

.footer-bottom {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ====================================
   响应式设计
   ==================================== */
@media (max-width: 1024px) {
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .product-featured {
        grid-column: span 1;
    }
    
    .values-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--space-12);
    }
    
    .contact-wrapper {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .contact-desc {
        margin-left: auto;
        margin-right: auto;
    }
    
    .contact-details {
        align-items: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: var(--space-24) var(--space-8);
        gap: var(--space-6);
        transition: right var(--transition-base);
        border-left: 1px solid var(--border-color);
        box-shadow: var(--shadow-xl);
    }
    
    .nav-links.active {
        right: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: var(--space-4);
    }
    
    .stat-divider {
        display: none;
    }
    
    .values-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-10);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-2);
        text-align: center;
    }
    
    .hero-subtitle br {
        display: none;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    :root {
        font-size: 14px;
    }
    
    .container {
        padding: 0 var(--space-4);
    }
    
    .product-card {
        padding: var(--space-6);
    }
    
    .product-logo {
        width: 48px;
        height: 48px;
    }
    
    .product-name {
        font-size: 1.25rem;
    }
}

/* 动画延迟 */
.product-card:nth-child(1) { transition-delay: 0s; }
.product-card:nth-child(2) { transition-delay: 0.1s; }
.product-card:nth-child(3) { transition-delay: 0.2s; }
.product-card:nth-child(4) { transition-delay: 0.3s; }
.product-card:nth-child(5) { transition-delay: 0.4s; }

.value-card:nth-child(1) { transition-delay: 0s; }
.value-card:nth-child(2) { transition-delay: 0.1s; }
.value-card:nth-child(3) { transition-delay: 0.2s; }
.value-card:nth-child(4) { transition-delay: 0.3s; }

.timeline-item:nth-child(1) { transition-delay: 0s; }
.timeline-item:nth-child(2) { transition-delay: 0.15s; }
.timeline-item:nth-child(3) { transition-delay: 0.3s; }