/* ============================================
   安徽足行机器人集团 - 全局样式
   ============================================ */

:root {
    --primary: #FF6B35;
    --primary-dark: #E55A28;
    --primary-light: #FF8C5A;
    --bg-dark: #0A0E27;
    --bg-dark-2: #121842;
    --bg-card: #1A1F4E;
    --bg-card-hover: #232A5E;
    --text-main: #FFFFFF;
    --text-muted: #A0A8D0;
    --text-dim: #6B73A0;
    --border: rgba(255,255,255,0.1);
    --border-glow: rgba(255,107,53,0.3);
    --gradient-hero: linear-gradient(135deg, #0A0E27 0%, #1A1F4E 50%, #2D1B69 100%);
    --gradient-accent: linear-gradient(135deg, #FF6B35 0%, #FF8C42 100%);
    --shadow-card: 0 10px 40px rgba(0,0,0,0.3);
    --shadow-glow: 0 0 40px rgba(255,107,53,0.15);
    --radius: 16px;
    --radius-small: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --font-main: 'Noto Sans SC', 'WenQuanYi Micro Hei', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

ul {
    list-style: none;
}

/* ============ 导航栏 ============ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(20px);
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 800;
}

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

.nav-logo .logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.nav-logo .logo-text small {
    font-size: 0.65rem;
    color: var(--primary);
    font-weight: 600;
    letter-spacing: 2px;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-menu a {
    padding: 8px 16px;
    border-radius: var(--radius-small);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: var(--transition);
}

.nav-menu a:hover {
    color: var(--text-main);
    background: rgba(255,255,255,0.08);
}

.nav-menu a.active {
    color: var(--primary);
    background: rgba(255,107,53,0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-main);
    border-radius: 2px;
    transition: var(--transition);
}

/* ============ 英雄区 ============ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    overflow: hidden;
    padding: 120px 24px 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    transform: perspective(500px) rotateX(60deg) scale(2);
    transform-origin: bottom;
    opacity: 0.5;
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
}

.hero-glow-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,107,53,0.15) 0%, transparent 70%);
    top: -100px;
    right: -100px;
}

.hero-glow-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(106,13,173,0.2) 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
    text-align: center;
    animation: fadeUp 1s ease-out;
}

.hero-badge {
    display: inline-block;
    padding: 8px 24px;
    background: rgba(255,107,53,0.15);
    border: 1px solid var(--border-glow);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--primary-light);
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

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

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-accent);
    color: #fff;
    box-shadow: 0 4px 20px rgba(255,107,53,0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(255,107,53,0.4);
}

.btn-outline {
    background: transparent;
    color: var(--text-main);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-large {
    padding: 16px 40px;
    font-size: 1.05rem;
}

/* 英雄区数据 */
.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 700px;
    margin: 0 auto;
}

.stat-item {
    text-align: center;
    padding: 20px 10px;
    background: rgba(255,255,255,0.03);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.stat-number {
    font-size: 2rem;
    font-weight: 900;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-dim);
    margin-top: 4px;
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
}

.mouse {
    width: 26px;
    height: 42px;
    border: 2px solid var(--text-dim);
    border-radius: 13px;
    position: relative;
}

.mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--primary);
    border-radius: 2px;
    animation: scrollMouse 2s infinite;
}

/* ============ 通用 Section ============ */
.section {
    padding: 100px 0;
    position: relative;
}

.section-light {
    background: var(--bg-dark-2);
}

.section-dark {
    background: var(--bg-dark);
}

.section-accent {
    background: linear-gradient(135deg, var(--bg-dark-2) 0%, var(--bg-card) 100%);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ============ 卡片网格 ============ */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

.card-large {
    grid-column: span 2;
}

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

.card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.card-list {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.card-list li {
    padding: 6px 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding-left: 20px;
    position: relative;
}

.card-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.card-accent {
    background: linear-gradient(135deg, rgba(255,107,53,0.1) 0%, var(--bg-card) 100%);
    border-color: var(--border-glow);
}

/* ============ 时间线 ============ */
.product-timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding-left: 30px;
}

.product-timeline::before {
    content: '';
    position: absolute;
    left: 7px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), transparent);
}

.timeline-item {
    position: relative;
    padding: 0 0 40px 40px;
}

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

.timeline-dot {
    position: absolute;
    left: -30px;
    top: 4px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 0 4px rgba(255,107,53,0.2);
}

.timeline-content h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--primary-light);
}

.timeline-content p {
    color: var(--text-muted);
}

/* ============ 数据卡片 ============ */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.metric-card {
    text-align: center;
    padding: 40px 20px;
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.metric-card:hover {
    border-color: var(--border-glow);
    transform: translateY(-3px);
}

.metric-value {
    font-size: 3rem;
    font-weight: 900;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.metric-label {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* ============ CTA ============ */
.cta-section {
    background: var(--gradient-accent);
    padding: 80px 24px;
    text-align: center;
}

.cta-content h2 {
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    font-weight: 800;
    margin-bottom: 16px;
    color: #fff;
}

.cta-content p {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.9);
    max-width: 600px;
    margin: 0 auto 32px;
}

.cta-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.cta-section .btn-outline {
    color: #fff;
    border-color: rgba(255,255,255,0.5);
}

.cta-section .btn-outline:hover {
    border-color: #fff;
    background: rgba(255,255,255,0.1);
}

/* ============ 页脚 ============ */
.footer {
    background: var(--bg-dark);
    border-top: 1px solid var(--border);
    padding: 60px 0 20px;
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.footer-logo .logo-icon {
    font-size: 1.5rem;
}

.footer-logo .logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.footer-logo .logo-text small {
    font-size: 0.6rem;
    color: var(--primary);
    font-weight: 600;
    letter-spacing: 2px;
}

.footer-col h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-main);
}

.footer-col ul li {
    margin-bottom: 8px;
}

.footer-col ul li a {
    color: var(--text-muted);
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.footer-col p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 2;
}

.footer-bottom {
    text-align: center;
    padding: 24px 0 0;
    margin-top: 40px;
    border-top: 1px solid var(--border);
    color: var(--text-dim);
    font-size: 0.85rem;
}

/* ============ 动画 ============ */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scrollMouse {
    0% { transform: translateX(-50%) translateY(0); opacity: 1; }
    100% { transform: translateX(-50%) translateY(15px); opacity: 0; }
}

/* ============ 关于我们页面 ============ */
.about-hero {
    padding: 160px 0 80px;
    background: var(--gradient-hero);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.about-hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(255,107,53,0.1) 0%, transparent 50%);
}

.about-hero .container {
    position: relative;
    z-index: 1;
}

.about-hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    margin-bottom: 20px;
}

.about-hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto;
}

.about-content {
    padding: 80px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 24px;
}

.about-text p {
    color: var(--text-muted);
    margin-bottom: 16px;
    font-size: 1.05rem;
    line-height: 1.8;
}

.about-visual {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
}

.about-visual .big-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.about-visual h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.about-visual p {
    color: var(--text-muted);
}

/* 价值观 */
.values-section {
    padding: 80px 0;
    background: var(--bg-dark-2);
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.value-card {
    text-align: center;
    padding: 32px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.value-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-glow);
}

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

.value-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.value-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ============ 产品页面 ============ */
.product-hero {
    padding: 160px 0 80px;
    background: var(--gradient-hero);
    text-align: center;
}

.product-hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    margin-bottom: 16px;
}

.product-hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto;
}

.product-detail {
    padding: 60px 0;
}

.product-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    margin-bottom: 80px;
}

.product-item:nth-child(even) .product-visual {
    order: 2;
}

.product-visual {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 50px 30px;
    text-align: center;
    min-height: 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.product-visual .product-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.product-visual h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.product-visual p {
    color: var(--text-muted);
}

.product-info h2 {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.product-info .product-tag {
    display: inline-block;
    padding: 4px 16px;
    background: rgba(255,107,53,0.15);
    color: var(--primary-light);
    border-radius: 50px;
    font-size: 0.8rem;
    margin-bottom: 16px;
}

.product-info p {
    color: var(--text-muted);
    margin-bottom: 16px;
    line-height: 1.8;
}

.product-features {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.product-features span {
    padding: 6px 14px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============ 平台架构页面 ============ */
.platform-hero {
    padding: 160px 0 80px;
    background: var(--gradient-hero);
    text-align: center;
}

.platform-hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    margin-bottom: 16px;
}

.platform-hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto;
}

.platform-layer {
    padding: 60px 0;
    text-align: center;
}

.layer-badge {
    display: inline-block;
    padding: 6px 20px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 30px;
    letter-spacing: 1px;
}

.layer-badge.hardware {
    background: rgba(255,107,53,0.15);
    color: var(--primary-light);
}

.layer-badge.platform {
    background: rgba(106,13,173,0.2);
    color: #B388FF;
}

.layer-badge.eco {
    background: rgba(0,200,150,0.15);
    color: #4ECDC4;
}

.layer-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.layer-desc {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
}

.layer-modules {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.layer-module {
    padding: 24px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.layer-module:hover {
    transform: translateY(-3px);
    border-color: var(--border-glow);
}

.layer-module .module-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.layer-module h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.layer-module p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============ 团队页面 ============ */
.team-hero {
    padding: 160px 0 60px;
    background: var(--gradient-hero);
    text-align: center;
}

.team-hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    margin-bottom: 16px;
}

.team-hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.team-grid {
    padding: 60px 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.team-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px;
    transition: var(--transition);
}

.team-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

.team-card .team-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 20px;
}

.team-card h3 {
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.team-card .team-role {
    color: var(--primary);
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.team-card .team-bio {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.8;
}

/* ============ 合作单位页面 ============ */
.partners-hero {
    padding: 160px 0 60px;
    background: var(--gradient-hero);
    text-align: center;
}

.partners-hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    margin-bottom: 16px;
}

.partners-grid {
    padding: 60px 0;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.partner-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 20px;
    text-align: center;
    transition: var(--transition);
}

.partner-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

.partner-logo {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 12px;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.partner-card h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.partner-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============ 联系页面 ============ */
.contact-hero {
    padding: 160px 0 80px;
    background: var(--gradient-hero);
    text-align: center;
}

.contact-hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 900;
    margin-bottom: 16px;
}

.contact-hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.contact-section {
    padding: 60px 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px;
}

.contact-info h2 {
    font-size: 1.5rem;
    margin-bottom: 24px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin-bottom: 24px;
}

.contact-item .contact-icon {
    font-size: 1.5rem;
    min-width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255,107,53,0.1);
    border-radius: 10px;
}

.contact-item h4 {
    font-size: 0.95rem;
    margin-bottom: 4px;
    color: var(--text-muted);
}

.contact-item p {
    color: var(--text-main);
    font-weight: 500;
}

.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px;
}

.contact-form h2 {
    font-size: 1.5rem;
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: var(--radius-small);
    color: var(--text-main);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(255,107,53,0.1);
}

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

/* ============ 响应式 ============ */
@media (max-width: 900px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--bg-dark-2);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        padding: 20px 0;
        border-bottom: 1px solid var(--border);
    }
    .nav-menu.active {
        left: 0;
    }
    .nav-toggle {
        display: flex;
    }
    .cards-grid {
        grid-template-columns: 1fr;
    }
    .card-large {
        grid-column: span 1;
    }
    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .values-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .product-item {
        grid-template-columns: 1fr;
    }
    .product-item:nth-child(even) .product-visual {
        order: 0;
    }
    .layer-modules {
        grid-template-columns: repeat(2, 1fr);
    }
    .team-grid {
        grid-template-columns: 1fr;
    }
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .footer-container {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 600px) {
    .section {
        padding: 60px 0;
    }
    .hero-stats {
        grid-template-columns: 1fr 1fr;
    }
    .metrics-grid {
        grid-template-columns: 1fr 1fr;
    }
    .values-grid {
        grid-template-columns: 1fr;
    }
    .layer-modules {
        grid-template-columns: 1fr;
    }
    .partners-grid {
        grid-template-columns: 1fr 1fr;
    }
    .footer-container {
        grid-template-columns: 1fr;
    }
    .hero-actions {
        flex-direction: column;
    }
}