/* ========================================
   见引GEO 官方网站样式表
   设计风格：高端极简未来科技风
   ======================================== */

/* ---------- CSS 变量定义 ---------- */
:root {
    --color-primary: #367BFF;
    --color-primary-dark: #2548E6;
    --color-primary-light: #74B4FF;
    --color-bg: #111622;
    --color-bg-secondary: #161C2D;
    --color-bg-card: #1A2133;
    --color-text-white: #FFFFFF;
    --color-text-body: #C8CDD8;
    --color-text-muted: #8A93A6;
    --color-border: rgba(54, 123, 255, 0.15);
    --color-glow: rgba(54, 123, 255, 0.4);
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    --container-max: 1200px;
    --nav-height: 72px;
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-glow: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- 全局重置 ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text-body);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* ---------- 网格底纹背景 ---------- */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(54, 123, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(54, 123, 255, 0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
    z-index: 0;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { background-position: 0 0; }
    100% { background-position: 60px 60px; }
}

/* ---------- 粒子背景容器 ---------- */
.particles-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: var(--color-primary-light);
    box-shadow: 0 0 6px var(--color-primary), 0 0 12px rgba(54, 123, 255, 0.5);
    animation: particleFloat linear infinite, particleTwinkle ease-in-out infinite;
}

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

@keyframes particleTwinkle {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 0.8; }
}

/* 粒子连线画布 */
.particles-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

/* ---------- 通用容器 ---------- */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* ---------- 排版层级 ---------- */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-text-white);
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.03em;
}

h2 {
    font-size: clamp(1.8rem, 3.5vw, 2.5rem);
    margin-bottom: 1rem;
}

h3 {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    margin-bottom: 0.75rem;
}

p {
    color: var(--color-text-body);
    font-size: 1rem;
    line-height: 1.7;
}

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

/* ---------- 导航栏 ---------- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(17, 22, 34, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: var(--transition-smooth);
}

.navbar.scrolled {
    background: rgba(17, 22, 34, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.nav-logo img {
    height: 36px;
    width: auto;
}

.nav-logo span {
    color: var(--color-text-white);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 40px;
    list-style: none;
}

.nav-menu a {
    color: var(--color-text-body);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-smooth);
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-text-white);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    transition: var(--transition-smooth);
}

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

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text-white);
    transition: var(--transition-smooth);
    border-radius: 2px;
}

/* ---------- 按钮样式 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 8px;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: 0 4px 20px rgba(54, 123, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(54, 123, 255, 0.5);
}

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

.btn-secondary:hover {
    border-color: var(--color-primary);
    background: rgba(54, 123, 255, 0.1);
    transform: translateY(-2px);
}

/* ---------- Hero 区域 ---------- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--nav-height);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(54, 123, 255, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-content {
    max-width: 720px;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(54, 123, 255, 0.1);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--color-primary-light);
    margin-bottom: 24px;
}

.hero-badge::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

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

.hero h1 {
    margin-bottom: 20px;
    background: linear-gradient(135deg, #FFFFFF 0%, var(--color-primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-muted);
    margin-bottom: 40px;
    letter-spacing: 0.05em;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* ---------- 通用区块 ---------- */
.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 60px;
}

.section-header p {
    color: var(--color-text-muted);
    margin-top: 16px;
}

.section-label {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 16px;
}

/* ---------- 品牌简介 ---------- */
.about-intro {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

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

.about-intro-text p {
    margin-bottom: 20px;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.stat-item {
    text-align: center;
    padding: 32px 24px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: var(--transition-smooth);
}

.stat-item:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* ---------- 核心业务板块 ---------- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.service-card {
    padding: 40px 32px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
    opacity: 0;
    transition: var(--transition-smooth);
}

.service-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-primary);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, rgba(54, 123, 255, 0.2), rgba(37, 72, 230, 0.1));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 24px;
}

.service-card h3 {
    margin-bottom: 12px;
}

.service-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ---------- 合作优势 ---------- */
.advantages {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

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

.advantage-item {
    text-align: center;
    padding: 32px 20px;
}

.advantage-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: white;
}

.advantage-item h4 {
    color: var(--color-text-white);
    font-size: 1rem;
    margin-bottom: 8px;
}

.advantage-item p {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    line-height: 1.6;
}

/* ---------- 定价卡片 ---------- */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: stretch;
}

.pricing-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: 40px 32px;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: var(--transition-glow);
    overflow: hidden;
}

.pricing-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(54, 123, 255, 0.15) 0%, transparent 60%);
    opacity: 0;
    transition: var(--transition-glow);
    transform: scale(0.8);
}

.pricing-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-primary);
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.4),
        0 0 40px var(--color-glow),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.pricing-card:hover::before {
    opacity: 1;
    transform: scale(1);
    animation: glowRotate 3s infinite linear;
}

@keyframes glowRotate {
    0% { transform: scale(1) rotate(0deg); }
    100% { transform: scale(1) rotate(360deg); }
}

.pricing-card.featured {
    border-color: var(--color-primary);
    transform: scale(1.02);
}

.pricing-card.featured::after {
    content: '推荐';
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 4px 12px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 100px;
}

.pricing-tier {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}

.pricing-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-white);
    margin-bottom: 8px;
}

.pricing-desc {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 24px;
}

.pricing-price {
    margin-bottom: 24px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-border);
}

.price-amount {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-text-white);
}

.price-period {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
    flex-grow: 1;
}

.pricing-features li {
    padding: 10px 0;
    color: var(--color-text-body);
    font-size: 0.9rem;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.pricing-features li::before {
    content: '✓';
    color: var(--color-primary);
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
}

.pricing-card .btn {
    width: 100%;
}

/* ---------- FAQ 折叠组件 ---------- */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    margin-bottom: 16px;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.faq-item:hover {
    border-color: rgba(54, 123, 255, 0.3);
}

.faq-item.active {
    border-color: var(--color-primary);
}

.faq-question {
    width: 100%;
    padding: 24px 28px;
    background: none;
    border: none;
    color: var(--color-text-white);
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: inherit;
    transition: var(--transition-smooth);
}

.faq-question:hover {
    color: var(--color-primary-light);
}

.faq-icon {
    width: 24px;
    height: 24px;
    position: relative;
    flex-shrink: 0;
    margin-left: 20px;
}

.faq-icon::before,
.faq-icon::after {
    content: '';
    position: absolute;
    background: var(--color-primary);
    transition: var(--transition-smooth);
}

.faq-icon::before {
    top: 50%;
    left: 0;
    right: 0;
    height: 2px;
    transform: translateY(-50%);
}

.faq-icon::after {
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    transform: translateX(-50%);
}

.faq-item.active .faq-icon::after {
    transform: translateX(-50%) rotate(90deg);
    opacity: 0;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer-content {
    padding: 0 28px 24px;
    color: var(--color-text-muted);
    line-height: 1.8;
    font-size: 0.95rem;
}

/* ---------- 关于我们页面 ---------- */
.about-hero {
    padding: 160px 0 80px;
    text-align: center;
}

.about-hero h1 {
    margin-bottom: 20px;
}

.about-hero p {
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.1rem;
}

.about-section {
    padding: 80px 0;
    border-top: 1px solid var(--color-border);
}

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

.about-info-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 40px;
}

.info-item {
    padding: 20px 0;
    border-bottom: 1px solid var(--color-border);
}

.info-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.info-item:first-child {
    padding-top: 0;
}

.info-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-value {
    color: var(--color-text-white);
    font-size: 1rem;
    font-weight: 500;
}

.philosophy-list {
    list-style: none;
    margin-top: 24px;
}

.philosophy-list li {
    padding: 16px 0;
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.philosophy-list li::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 50%;
    margin-top: 8px;
    flex-shrink: 0;
}

/* ---------- 联系我们页面 ---------- */
.contact-hero {
    padding: 160px 0 80px;
    text-align: center;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    padding-bottom: 100px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 32px;
}

.contact-card h3 {
    margin-bottom: 16px;
    font-size: 1.2rem;
}

.qr-code-container {
    text-align: center;
    padding: 20px 0;
}

.qr-code-container img {
    width: 200px;
    height: 200px;
    border-radius: 12px;
    background: white;
    padding: 12px;
}

.qr-code-container p {
    margin-top: 16px;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

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

/* 表单样式 */
.contact-form {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 40px;
}

.contact-form h3 {
    margin-bottom: 24px;
}

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

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    color: var(--color-text-white);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(54, 123, 255, 0.1);
}

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

.contact-form .btn {
    width: 100%;
}

/* ---------- 页脚 ---------- */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 60px 0 30px;
    position: relative;
    z-index: 1;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand img {
    height: 36px;
    margin-bottom: 16px;
}

.footer-brand p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    line-height: 1.7;
    max-width: 300px;
}

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

.footer-qr img {
    width: 120px;
    height: 120px;
    border-radius: 8px;
    background: white;
    padding: 8px;
    margin-bottom: 12px;
}

.footer-qr p {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.footer-column h4 {
    color: var(--color-text-white);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 12px;
}

.footer-column a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition-smooth);
}

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

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

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

/* ---------- 页面标题区（内页通用） ---------- */
.page-header {
    padding: 160px 0 80px;
    text-align: center;
    position: relative;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    border-radius: 2px;
}

.page-header h1 {
    margin-bottom: 16px;
}

.page-header p {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    max-width: 500px;
    margin: 0 auto;
}

/* ---------- 响应式适配 ---------- */

/* 平板端 */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .pricing-card.featured {
        transform: scale(1);
    }
    
    .about-intro-content,
    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

/* 手机端 */
@media (max-width: 768px) {
    :root {
        --nav-height: 64px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: rgba(17, 22, 34, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition-smooth);
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .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);
    }
    
    .hero {
        min-height: auto;
        padding: 120px 0 80px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-buttons .btn {
        width: 100%;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
    
    .stat-item {
        padding: 24px 16px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .page-header {
        padding: 120px 0 60px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-brand p {
        max-width: 100%;
    }
    
    .contact-form,
    .contact-card,
    .about-info-card {
        padding: 28px 24px;
    }
    
    .faq-question {
        padding: 20px;
        font-size: 0.95rem;
    }
    
    .faq-answer-content {
        padding: 0 20px 20px;
    }
}

/* 小屏手机 */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-card {
        padding: 32px 24px;
    }
    
    .price-amount {
        font-size: 2rem;
    }
}

/* ---------- 视差滚动动画 ---------- */
.parallax-element {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.parallax-element.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- 工具类 ---------- */
.text-center {
    text-align: center;
}

.mt-4 { margin-top: 1rem; }
.mt-8 { margin-top: 2rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-8 { margin-bottom: 2rem; }