/* ============================================
   重置和全局样式
   ============================================ */

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

:root {
    --primary-color: #1e3a8a;
    --primary-light: #3b82f6;
    --secondary-color: #0f172a;
    --accent-color: #10b981;
    --text-color: #0f172a;
    --text-light: #64748b;
    --bg-color: #ffffff;
    --bg-light: #f8fafc;
    --border-color: #e2e8f0;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(255, 255, 255, 0.3);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ============================================
   加载动画
   ============================================ */

.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1e3a8a 0%, #0f172a 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    animation: fadeOut 0.8s ease-out 2s forwards;
}

.loading-content {
    text-align: center;
    color: white;
}

.loading-circle {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: #3b82f6;
    border-radius: 50%;
    margin: 0 auto 20px;
    animation: spin 1s linear infinite;
}

.loading-screen p {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: 2px;
}

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

@keyframes fadeOut {
    to {
        opacity: 0;
        visibility: hidden;
    }
}

/* ============================================
   导航栏
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
    display: flex;
    align-items: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.navbar.scrolled {
    height: 60px;
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: transform 0.3s ease;
}

.navbar-logo:hover {
    transform: scale(1.05);
}

.navbar-logo img {
    height: 40px;
    width: auto;
}

.navbar-menu {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    cursor: pointer;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-light);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        width: 0;
        left: 50%;
    }
    to {
        width: 100%;
        left: 0;
    }
}

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

.navbar-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-color);
    transition: all 0.3s ease;
}

/* ============================================
   首屏 HERO
   ============================================ */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    margin-top: 70px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.4) 0%, rgba(15, 23, 42, 0.6) 100%);
    z-index: 1;
}

.hero-container {
    position: relative;
    z-index: 2;
    max-width: 1400px;
    width: 100%;
    padding: 0 40px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    color: white;
    animation: fadeInUp 1s ease 0.3s both;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 30px;
    line-height: 1.8;
    max-width: 500px;
}

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

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

/* 按钮样式 */
.btn {
    padding: 12px 32px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* Hero 视觉部分 */
.hero-visual {
    position: relative;
    height: 500px;
    animation: fadeInRight 1s ease 0.5s both;
}

.phone-frame {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 280px;
    height: 560px;
    background: linear-gradient(135deg, #ffffff 0%, #f0f4ff 100%);
    border-radius: 40px;
    padding: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    z-index: 3;
    overflow: hidden;
}

.phone-frame img {
    width: 100%;
    height: 100%;
    border-radius: 30px;
    object-fit: cover;
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.floating-card {
    position: absolute;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    animation: float 3s ease-in-out infinite;
}

.card-asset {
    width: 200px;
    top: 50px;
    left: -20px;
    animation-delay: 0s;
}

.card-quote {
    width: 140px;
    top: 280px;
    left: 40px;
    animation-delay: 0.5s;
}

.card-nft {
    width: 130px;
    top: 180px;
    right: 80px;
    animation-delay: 1s;
}

.card-security {
    width: 120px;
    bottom: 100px;
    right: 40px;
    animation-delay: 1.5s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) scale(1);
    }
    50% {
        transform: translateY(-20px) scale(1.02);
    }
}

.card-header {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.card-value {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.card-change {
    font-size: 12px;
    color: var(--accent-color);
}

.card-label {
    font-size: 12px;
    color: var(--text-light);
    margin-bottom: 4px;
}

.card-price {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-color);
}

.card-percent {
    font-size: 12px;
    color: var(--accent-color);
    margin-top: 4px;
}

.card-count {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-color);
}

.card-icon {
    font-size: 24px;
    margin-bottom: 8px;
}

.card-text {
    font-size: 12px;
    color: var(--text-color);
    font-weight: 600;
    line-height: 1.4;
}

.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    z-index: 1;
}

.hero-particles::before,
.hero-particles::after {
    content: '';
    position: absolute;
    width: 2px;
    height: 2px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
}

/* ============================================
   通用章节样式
   ============================================ */

section {
    padding: 80px 0;
    position: relative;
}

.section-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
    animation: fadeInUp 0.8s ease;
}

.section-header h2 {
    font-size: 42px;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 15px;
}

.section-header p {
    font-size: 16px;
    color: var(--text-light);
}

/* ============================================
   产品能力模块
   ============================================ */

.products {
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.product-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
    z-index: 0;
}

.product-card:hover::before {
    left: 100%;
}

.product-card:hover {
    border-color: var(--primary-light);
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.1);
    transform: translateY(-8px);
}

.card-icon {
    font-size: 40px;
    margin-bottom: 16px;
    display: inline-block;
}

.product-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color);
}

.product-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ============================================
   APP展示模块
   ============================================ */

.app-showcase {
    background: white;
    position: relative;
}

.app-carousel {
    position: relative;
    max-width: 400px;
    margin: 0 auto;
}

.carousel-container {
    position: relative;
    overflow: hidden;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.carousel-track {
    display: flex;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.carousel-item {
    min-width: 100%;
    position: relative;
}

.carousel-item img {
    width: 100%;
    height: auto;
    display: block;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(30, 58, 138, 0.8);
    color: white;
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 10;
}

.carousel-prev {
    left: -70px;
}

.carousel-next {
    right: -70px;
}

.carousel-btn:hover {
    background: var(--primary-light);
    transform: translateY(-50%) scale(1.1);
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 30px;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot.active {
    background: var(--primary-light);
    width: 28px;
    border-radius: 4px;
}

/* ============================================
   安全体系模块
   ============================================ */

.security {
    background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
}

.security-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 60px;
}

.security-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    position: relative;
    transition: all 0.3s ease;
}

.security-item:hover {
    border-color: var(--primary-light);
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.1);
    transform: translateY(-8px);
}

.security-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-light);
    margin-bottom: 16px;
}

.security-item h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color);
}

.security-item p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 16px;
}

.security-feature {
    font-size: 12px;
    color: var(--accent-color);
    font-weight: 600;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.security-banner {
    margin-top: 60px;
}

.security-banner img {
    width: 100%;
    height: auto;
    border-radius: 16px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
}

/* ============================================
   下载中心模块
   ============================================ */

.download {
    background: white;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.download-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: all 0.3s ease;
}

.download-card:hover {
    border-color: var(--primary-light);
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.1);
    transform: translateY(-8px);
}

.download-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.download-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color);
}

.download-card p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 20px;
}

.version-info {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 20px 0;
    padding: 16px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.version-number,
.version-date {
    font-size: 12px;
}

.version-number {
    color: var(--primary-light);
    font-weight: 600;
}

.version-date {
    color: var(--text-light);
}

.download-banner {
    margin-top: 60px;
}

.download-banner img {
    width: 100%;
    height: auto;
    border-radius: 16px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
}

/* ============================================
   使用流程模块
   ============================================ */

.guide {
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.timeline {
    max-width: 900px;
    margin: 0 auto 60px;
}

.timeline-item {
    display: flex;
    gap: 30px;
    margin-bottom: 40px;
    position: relative;
    animation: fadeInUp 0.8s ease;
}

.timeline-item:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 25px;
    top: 80px;
    width: 2px;
    height: 60px;
    background: linear-gradient(180deg, var(--primary-light) 0%, transparent 100%);
}

.timeline-dot {
    flex-shrink: 0;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    position: relative;
    z-index: 2;
}

.timeline-content h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 8px;
}

.timeline-content p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

.guide-banner {
    margin-top: 60px;
}

.guide-banner img {
    width: 100%;
    height: auto;
    border-radius: 16px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
}

/* ============================================
   生态服务模块
   ============================================ */

.ecosystem {
    background: white;
}

.ecosystem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.ecosystem-card {
    background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.ecosystem-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary-light), transparent);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.ecosystem-card:hover::before {
    transform: scaleX(1);
}

.ecosystem-card:hover {
    border-color: var(--primary-light);
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.1);
    transform: translateY(-8px);
}

.ecosystem-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.ecosystem-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-color);
}

.ecosystem-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* ============================================
   资讯中心模块
   ============================================ */

.news {
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.news-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.news-card:hover {
    border-color: var(--primary-light);
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.15);
    transform: translateY(-8px);
}

.news-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: var(--bg-light);
}

.news-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.news-content {
    padding: 24px;
}

.news-content h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 12px;
    line-height: 1.4;
}

.news-content p {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 16px;
}

.read-more {
    color: var(--primary-light);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
}

.read-more:hover {
    gap: 4px;
}

/* ============================================
   FAQ模块
   ============================================ */

.faq {
    background: white;
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: var(--primary-light);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.1);
}

.faq-question {
    width: 100%;
    padding: 20px;
    background: white;
    border: none;
    text-align: left;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.faq-question::after {
    content: '▼';
    font-size: 12px;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question {
    background: linear-gradient(135deg, #f8fafc 0%, #ffffff 100%);
    color: var(--primary-light);
}

.faq-item.active .faq-question::after {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background: var(--bg-light);
}

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

.faq-answer p {
    padding: 0 20px 20px;
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

/* ============================================
   联系我们模块
   ============================================ */

.contact {
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.contact-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s ease;
}

.contact-card:hover {
    border-color: var(--primary-light);
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.1);
    transform: translateY(-8px);
}

.contact-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-color);
}

.contact-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

.contact-banner {
    margin-top: 60px;
}

.contact-banner img {
    width: 100%;
    height: auto;
    border-radius: 16px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
}

/* ============================================
   页脚
   ============================================ */

.footer {
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
    color: white;
    padding: 60px 0 0;
    margin-top: 80px;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    padding-bottom: 40px;
}

.footer-section h4 {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 20px;
    color: white;
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

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

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.3s ease;
}

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

.social-links {
    display: flex;
    gap: 15px;
}

.footer-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 40px 0;
}

.footer-bottom {
    padding-bottom: 40px;
}

.footer-text p {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 16px;
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 16px;
}

.copyright a {
    color: rgba(255, 255, 255, 0.7);
}

.copyright a:hover {
    color: white;
}

/* ============================================
   返回顶部按钮
   ============================================ */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-color) 100%);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 500;
}

.back-to-top.show {
    display: flex;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

/* ============================================
   响应式设计
   ============================================ */

@media (max-width: 1440px) {
    .section-container {
        padding: 0 30px;
    }

    .navbar-container {
        padding: 0 30px;
    }

    .hero-container {
        padding: 0 30px;
        gap: 40px;
    }

    .hero-title {
        font-size: 40px;
    }

    .section-header h2 {
        font-size: 36px;
    }
}

@media (max-width: 1024px) {
    .navbar-menu {
        gap: 20px;
    }

    .nav-link {
        font-size: 13px;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 14px;
    }

    .hero-visual {
        height: 400px;
    }

    .phone-frame {
        width: 240px;
        height: 480px;
    }

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

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

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

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

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

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

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

    section {
        padding: 60px 0;
    }
}

@media (max-width: 768px) {
    .navbar-menu {
        display: none;
    }

    .navbar-toggle {
        display: flex;
    }

    .navbar-container {
        padding: 0 20px;
    }

    .navbar.active .navbar-menu {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        padding: 20px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        gap: 0;
    }

    .navbar.active .nav-link {
        padding: 12px 0;
        border-bottom: 1px solid var(--border-color);
    }

    .section-container {
        padding: 0 20px;
    }

    .hero-container {
        padding: 0 20px;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 13px;
    }

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

    .btn {
        padding: 10px 24px;
        font-size: 13px;
    }

    .hero-visual {
        display: none;
    }

    .products-grid,
    .security-grid,
    .download-grid,
    .ecosystem-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }

    .section-header h2 {
        font-size: 28px;
    }

    .section-header p {
        font-size: 14px;
    }

    .product-card,
    .security-item,
    .download-card,
    .ecosystem-card {
        padding: 24px 16px;
    }

    .carousel-prev,
    .carousel-next {
        left: 10px;
        right: auto;
    }

    .carousel-next {
        right: 10px;
        left: auto;
    }

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

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

    .timeline-item {
        gap: 20px;
    }

    .timeline-dot {
        width: 44px;
        height: 44px;
        font-size: 16px;
    }

    section {
        padding: 50px 0;
    }

    .back-to-top {
        width: 40px;
        height: 40px;
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 390px) {
    .navbar-logo {
        gap: 8px;
        font-size: 16px;
    }

    .navbar-logo img {
        height: 32px;
    }

    .hero-title {
        font-size: 24px;
        margin-bottom: 15px;
    }

    .hero-subtitle {
        font-size: 12px;
    }

    .section-header h2 {
        font-size: 24px;
    }

    .section-header p {
        font-size: 13px;
    }

    .product-card,
    .security-item,
    .download-card,
    .ecosystem-card {
        padding: 16px 12px;
    }

    .product-card h3,
    .security-item h3,
    .ecosystem-card h3 {
        font-size: 16px;
    }

    .card-icon {
        font-size: 32px;
    }

    .ecosystem-icon {
        font-size: 40px;
    }

    .timeline-item {
        gap: 16px;
    }

    .faq-question {
        font-size: 14px;
        padding: 16px;
    }

    section {
        padding: 40px 0;
    }
}

/* ============================================
   打印样式
   ============================================ */

@media print {
    .navbar,
    .back-to-top {
        display: none;
    }
}