/* ========================================
   浙江安闳技术有限公司 - 企业官网样式
   ======================================== */

/* CSS变量 */
:root {
    --primary-color: #1a5fb4;
    --primary-dark: #154a8c;
    --primary-light: #3584e4;
    --secondary-color: #26a269;
    --accent-color: #ff7800;
    --text-dark: #1c1c1c;
    --text-medium: #5e5e5e;
    --text-light: #8c8c8c;
    --bg-white: #ffffff;
    --bg-light: #f6f8fc;
    --bg-dark: #1a1a2e;
    --border-color: #e0e4e8;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.15);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-padding {
    padding: 100px 0;
}

.bg-light {
    background-color: var(--bg-light);
}

/* ========================================
   按钮样式
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--bg-white);
    box-shadow: 0 4px 15px rgba(26, 95, 180, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 95, 180, 0.45);
}

.btn-secondary {
    background: transparent;
    color: var(--bg-white);
    border: 2px solid rgba(255,255,255,0.4);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.7);
}

.btn-full {
    width: 100%;
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 15px 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
    padding: 10px 0;
}

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

.logo {
    display: flex;
    align-items: center;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-cn {
    font-size: 18px;
    font-weight: 700;
    color: var(--bg-white);
    transition: var(--transition);
}

.logo-en {
    font-size: 11px;
    color: rgba(255,255,255,0.7);
    letter-spacing: 0.5px;
    transition: var(--transition);
}

.navbar.scrolled .logo-cn {
    color: var(--text-dark);
}

.navbar.scrolled .logo-en {
    color: var(--text-medium);
}

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-size: 15px;
    font-weight: 500;
    color: rgba(255,255,255,0.85);
    position: relative;
    padding: 5px 0;
    transition: var(--transition);
}

.navbar.scrolled .nav-link {
    color: var(--text-dark);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transition: var(--transition);
}

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

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

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

.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    background-color: var(--bg-white);
    border-radius: 3px;
    transition: var(--transition);
}

.navbar.scrolled .bar {
    background-color: var(--text-dark);
}

/* ========================================
   英雄区
   ======================================== */
.hero {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(26, 95, 180, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(38, 162, 105, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(255, 120, 0, 0.05) 0%, transparent 60%);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--bg-white);
}

.hero-title {
    font-size: 64px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 8px;
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--primary-light), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 24px;
    font-weight: 300;
    margin-bottom: 15px;
    opacity: 0.95;
}

.hero-desc {
    font-size: 16px;
    color: rgba(255,255,255,0.7);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: rgba(255,255,255,0.5);
    font-size: 12px;
    letter-spacing: 2px;
}

.mouse {
    width: 26px;
    height: 40px;
    border: 2px solid rgba(255,255,255,0.4);
    border-radius: 13px;
    margin: 0 auto 10px;
    position: relative;
}

.wheel {
    width: 4px;
    height: 8px;
    background: rgba(255,255,255,0.6);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollWheel 2s infinite;
}

@keyframes scrollWheel {
    0% { top: 8px; opacity: 1; }
    100% { top: 20px; opacity: 0; }
}

/* ========================================
   章节标题
   ======================================== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 13px;
    font-weight: 600;
    color: var(--primary-color);
    letter-spacing: 3px;
    margin-bottom: 10px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 15px;
}

.section-line {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    margin: 0 auto;
    border-radius: 2px;
}

/* ========================================
   关于我们
   ======================================== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h3 {
    font-size: 28px;
    color: var(--text-dark);
    margin-bottom: 5px;
}

.about-subtitle {
    font-size: 14px;
    color: var(--primary-color);
    margin-bottom: 25px;
    letter-spacing: 1px;
}

.about-desc {
    font-size: 16px;
    color: var(--text-medium);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-features {
    display: flex;
    gap: 30px;
    margin-top: 30px;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px 25px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.feature-item i {
    font-size: 28px;
    color: var(--primary-color);
}

.feature-item span {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
}

.about-visual {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.about-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    padding: 40px;
    border-radius: var(--radius-lg);
    color: var(--bg-white);
    text-align: center;
}

.card-icon {
    width: 70px;
    height: 70px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 30px;
}

.about-card h4 {
    font-size: 22px;
    margin-bottom: 10px;
}

.about-card p {
    opacity: 0.9;
    font-size: 15px;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.stat-item {
    background: var(--bg-white);
    padding: 30px;
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-medium);
}

/* ========================================
   业务领域
   ======================================== */
.business-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.business-card {
    background: var(--bg-white);
    padding: 35px 25px;
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.business-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.business-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, rgba(26, 95, 180, 0.1), rgba(53, 132, 228, 0.1));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 28px;
    color: var(--primary-color);
    transition: var(--transition);
}

.business-card:hover .business-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--bg-white);
}

.business-card h3 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.business-card p {
    font-size: 14px;
    color: var(--text-medium);
    line-height: 1.7;
    margin-bottom: 20px;
}

.business-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary-color);
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.business-link:hover {
    gap: 10px;
}

/* ========================================
   产品中心
   ======================================== */
.products-intro {
    text-align: center;
    margin-bottom: 50px;
}

.products-intro p {
    font-size: 16px;
    color: var(--text-medium);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.product-image-container {
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, var(--bg-light), #e8ecf1);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

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

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

.product-image {
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, var(--bg-light), #e8ecf1);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-placeholder {
    width: 80px;
    height: 80px;
    background: var(--bg-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--primary-color);
    box-shadow: var(--shadow-sm);
}

.product-info {
    padding: 25px;
}

.product-info h4 {
    font-size: 17px;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.product-info p {
    font-size: 14px;
    color: var(--text-medium);
}

/* ========================================
   CSS产品图形
   ======================================== */
.product-visual {
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, #e8ecf1, #f0f4f8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

/* 监控摄像头 */
.product-visual.camera .device-body {
    width: 80px;
    height: 50px;
    background: linear-gradient(145deg, #2c3e50, #34495e);
    border-radius: 8px;
    position: relative;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.product-visual.camera .lens {
    width: 35px;
    height: 35px;
    background: radial-gradient(circle at 30% 30%, #5dade2, #1a5276);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 3px solid #1c2833;
}

.product-visual.camera .led {
    width: 6px;
    height: 6px;
    background: #e74c3c;
    border-radius: 50%;
    position: absolute;
    top: 8px;
    right: 10px;
    animation: blink 2s infinite;
}

.product-visual.camera .mount {
    width: 20px;
    height: 25px;
    background: #7f8c8d;
    margin-top: -5px;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* 网络录像机 */
.product-visual.nvr .server-box {
    width: 100px;
    height: 70px;
    background: linear-gradient(145deg, #34495e, #2c3e50);
    border-radius: 4px;
    padding: 10px;
    position: relative;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.product-visual.nvr .drive-row {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
}

.product-visual.nvr .drive-row span {
    width: 15px;
    height: 4px;
    background: #5d6d7e;
    border-radius: 1px;
}

.product-visual.nvr .indicator {
    width: 8px;
    height: 8px;
    background: #2ecc71;
    border-radius: 50%;
    position: absolute;
    bottom: 10px;
    right: 10px;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(46, 204, 113, 0.7); }
    50% { box-shadow: 0 0 0 6px rgba(46, 204, 113, 0); }
}

/* 智能门禁 */
.product-visual.access .access-panel {
    width: 70px;
    height: 90px;
    background: linear-gradient(145deg, #ecf0f1, #bdc3c7);
    border-radius: 8px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
}

.product-visual.access .screen {
    width: 50px;
    height: 35px;
    background: #1a252f;
    border-radius: 4px;
    margin-bottom: 8px;
}

.product-visual.access .keypad {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4px;
}

.product-visual.access .keypad span {
    width: 12px;
    height: 8px;
    background: #5d6d7e;
    border-radius: 1px;
}

/* 物联网网关 */
.product-visual.gateway .gateway-box {
    width: 90px;
    height: 60px;
    background: linear-gradient(145deg, #f39c12, #d68910);
    border-radius: 6px;
    padding: 10px;
    position: relative;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.product-visual.gateway .port-row {
    display: flex;
    gap: 6px;
    margin-top: 25px;
}

.product-visual.gateway .port-row span {
    width: 14px;
    height: 10px;
    background: #2c3e50;
    border-radius: 2px;
}

.product-visual.gateway .antenna {
    width: 3px;
    height: 20px;
    background: #5d6d7e;
    position: absolute;
    top: -15px;
    right: 15px;
}

.product-visual.gateway .antenna::before {
    content: '';
    width: 3px;
    height: 15px;
    background: #5d6d7e;
    position: absolute;
    top: 5px;
    left: -8px;
}

.product-visual.gateway .signal {
    position: absolute;
    top: 5px;
    right: 8px;
    color: #fff;
    font-size: 12px;
}

.products-more {
    text-align: center;
    margin-top: 50px;
}

.products-more p {
    font-size: 15px;
    color: var(--text-light);
    font-style: italic;
}

/* ========================================
   解决方案
   ======================================== */
.solutions-intro {
    text-align: center;
    margin-bottom: 50px;
}

.solutions-intro p {
    font-size: 16px;
    color: var(--text-medium);
}

.solutions-placeholder {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
    margin-bottom: 40px;
}

.solution-item {
    background: var(--bg-white);
    padding: 40px 30px;
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.solution-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.solution-item i {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 15px;
    display: block;
}

.solution-item span {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-dark);
}

.coming-soon {
    text-align: center;
    padding: 30px;
    background: rgba(26, 95, 180, 0.05);
    border-radius: var(--radius-md);
    border: 2px dashed var(--border-color);
}

.coming-soon p {
    font-size: 15px;
    color: var(--text-light);
}

/* ========================================
   联系我们
   ======================================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.contact-card {
    background: var(--bg-white);
    padding: 30px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 55px;
    height: 55px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-white);
    font-size: 22px;
    margin-bottom: 15px;
}

.contact-card h3 {
    font-size: 16px;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.contact-detail {
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.contact-detail a {
    color: inherit;
}

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

.contact-note {
    font-size: 13px;
    color: var(--text-light);
}

.contact-form-wrapper {
    background: var(--bg-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.contact-form-wrapper h3 {
    font-size: 22px;
    color: var(--text-dark);
    margin-bottom: 25px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    font-size: 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-light);
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-white);
    box-shadow: 0 0 0 3px rgba(26, 95, 180, 0.1);
}

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

/* ========================================
   页脚
   ======================================== */
.footer {
    background: var(--bg-dark);
    color: var(--bg-white);
    padding: 70px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 50px;
    margin-bottom: 50px;
}

.footer-logo {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 15px;
}

.footer-desc {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    line-height: 1.7;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--bg-white);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
}

.footer-links a:hover {
    color: var(--primary-light);
}

.footer-contact p {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-contact i {
    color: var(--primary-light);
    width: 16px;
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

/* ========================================
   返回顶部
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--bg-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .business-grid,
    .products-grid,
    .solutions-placeholder {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-visual {
        order: -1;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--bg-white);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: var(--shadow-md);
        padding: 30px 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-link {
        color: var(--text-dark) !important;
        padding: 15px 0;
    }
    
    .hamburger {
        display: block;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }
    
    .hero-title {
        font-size: 36px;
        letter-spacing: 4px;
    }
    
    .hero-subtitle {
        font-size: 18px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .section-padding {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .business-grid,
    .products-grid,
    .solutions-placeholder {
        grid-template-columns: 1fr;
    }
    
    .about-features {
        flex-direction: column;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .contact-form-wrapper {
        order: -1;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 30px;
    }
    
    .footer-logo {
        justify-content: center;
    }
    
    .footer-contact p {
        justify-content: center;
    }
}

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

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease-out forwards;
}

/* 滚动显示动画 */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}