/* 全局基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Segoe UI', 'PingFang SC', Roboto, 'Helvetica Neue', sans-serif;
    background: #0f0f1a;
    color: #e0e0e0;
    line-height: 1.7;
    transition: background 0.3s, color 0.3s;
}
body.light-mode {
    background: #f5f7fa;
    color: #1a1a2e;
}
a {
    text-decoration: none;
    color: inherit;
}
img, svg {
    display: block;
    max-width: 100%;
    height: auto;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
/* 玻璃拟态卡片 */
.glass-card {
    background: rgba(255,255,255,0.08);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 24px;
    border: 1px solid rgba(255,255,255,0.12);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    padding: 24px;
    transition: transform 0.3s, box-shadow 0.3s;
}
.glass-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}
body.light-mode .glass-card {
    background: rgba(255,255,255,0.7);
    border-color: rgba(0,0,0,0.08);
    box-shadow: 0 8px 32px rgba(0,0,0,0.08);
}
/* 按钮 */
.btn-primary {
    display: inline-block;
    background: linear-gradient(135deg, #ff6b35, #ff4a2e);
    color: #fff;
    padding: 14px 36px;
    border-radius: 50px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 20px rgba(255,107,53,0.4);
}
.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 30px rgba(255,107,53,0.6);
}
/* 导航 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15,15,26,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    transition: background 0.3s;
}
body.light-mode header {
    background: rgba(245,247,250,0.85);
    border-bottom-color: rgba(0,0,0,0.06);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    max-width: 1200px;
    margin: 0 auto;
}
.logo a {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: #ff6b35;
}
.logo svg {
    width: 40px;
    height: 40px;
}
nav ul {
    display: flex;
    list-style: none;
    gap: 28px;
}
nav ul li a {
    font-weight: 500;
    transition: color 0.2s;
    position: relative;
}
nav ul li a:hover, nav ul li a.active {
    color: #ff6b35;
}
nav ul li a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: #ff6b35;
    transition: width 0.3s;
}
nav ul li a:hover::after, nav ul li a.active::after {
    width: 100%;
}
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: #e0e0e0;
    font-size: 1.8rem;
    cursor: pointer;
}
body.light-mode .menu-toggle {
    color: #1a1a2e;
}
.dark-toggle {
    background: none;
    border: none;
    color: #e0e0e0;
    font-size: 1.4rem;
    cursor: pointer;
    margin-left: 16px;
}
body.light-mode .dark-toggle {
    color: #1a1a2e;
}
/* 移动端菜单 */
.mobile-nav {
    display: none;
    background: rgba(15,15,26,0.98);
    backdrop-filter: blur(20px);
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    padding: 20px;
    z-index: 999;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
body.light-mode .mobile-nav {
    background: rgba(245,247,250,0.98);
}
.mobile-nav ul {
    list-style: none;
}
.mobile-nav ul li {
    padding: 12px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.mobile-nav ul li a {
    font-size: 1.1rem;
    font-weight: 500;
}
/* Hero Banner */
.hero {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 50%, #0f0f1a 100%);
    position: relative;
    overflow: hidden;
}
body.light-mode .hero {
    background: linear-gradient(135deg, #e8ecf1 0%, #f5f7fa 50%, #e8ecf1 100%);
}
.hero::before {
    content: '';
    position: absolute;
    top: -30%;
    left: -20%;
    width: 70%;
    height: 140%;
    background: radial-gradient(circle, rgba(255,107,53,0.15) 0%, transparent 70%);
    pointer-events: none;
}
.hero::after {
    content: '';
    position: absolute;
    bottom: -20%;
    right: -10%;
    width: 60%;
    height: 100%;
    background: radial-gradient(circle, rgba(255,74,46,0.1) 0%, transparent 70%);
    pointer-events: none;
}
.hero .container {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
}
.hero-text {
    flex: 1 1 500px;
}
.hero-text h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #ff6b35, #ffb347);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-text p {
    font-size: 1.2rem;
    opacity: 0.8;
    margin-bottom: 30px;
    max-width: 600px;
}
.hero-visual {
    flex: 1 1 400px;
    display: flex;
    justify-content: center;
}
.hero-visual svg {
    width: 100%;
    max-width: 450px;
    height: auto;
}
/* 轮播指示器 */
.carousel-indicators {
    display: flex;
    gap: 10px;
    margin-top: 30px;
}
.carousel-indicators span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    cursor: pointer;
    transition: background 0.3s, transform 0.3s;
}
.carousel-indicators span.active {
    background: #ff6b35;
    transform: scale(1.2);
}
/* 通用区块 */
section {
    padding: 80px 0;
}
.section-title {
    text-align: center;
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 16px;
}
.section-subtitle {
    text-align: center;
    opacity: 0.7;
    margin-bottom: 50px;
    font-size: 1.1rem;
}
.grid-2, .grid-3, .grid-4 {
    display: grid;
    gap: 30px;
}
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
/* 数字增长 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 30px;
    text-align: center;
}
.stat-item .number {
    font-size: 3rem;
    font-weight: 800;
    color: #ff6b35;
}
.stat-item .label {
    font-size: 1rem;
    opacity: 0.7;
    margin-top: 8px;
}
/* 合作伙伴logo墙 */
.partner-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
    align-items: center;
}
.partner-grid svg {
    width: 100px;
    height: 60px;
    opacity: 0.6;
    transition: opacity 0.3s;
}
.partner-grid svg:hover {
    opacity: 1;
}
/* 时间轴 */
.timeline {
    position: relative;
    padding-left: 40px;
    border-left: 2px solid #ff6b35;
}
.timeline-item {
    margin-bottom: 40px;
    position: relative;
}
.timeline-item::before {
    content: '';
    position: absolute;
    left: -46px;
    top: 6px;
    width: 14px;
    height: 14px;
    background: #ff6b35;
    border-radius: 50%;
    border: 3px solid #0f0f1a;
}
body.light-mode .timeline-item::before {
    border-color: #f5f7fa;
}
.timeline-item .year {
    font-weight: 700;
    color: #ff6b35;
    font-size: 1.2rem;
}
/* FAQ */
.faq-item {
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding: 16px 0;
}
body.light-mode .faq-item {
    border-color: rgba(0,0,0,0.1);
}
.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.1rem;
}
.faq-question span {
    transition: transform 0.3s;
}
.faq-question.open span {
    transform: rotate(45deg);
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s;
    padding-top: 0;
    opacity: 0.8;
}
.faq-answer.open {
    max-height: 600px;
    padding-top: 16px;
}
/* HowTo步骤 */
.step-list {
    counter-reset: step;
}
.step-item {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
    align-items: flex-start;
}
.step-number {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    background: #ff6b35;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.3rem;
    color: #fff;
}
/* 搜索框 */
.search-box {
    display: flex;
    gap: 10px;
    max-width: 400px;
    margin: 20px auto;
}
.search-box input {
    flex: 1;
    padding: 12px 20px;
    border-radius: 50px;
    border: 1px solid rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.05);
    color: #e0e0e0;
    font-size: 1rem;
    outline: none;
}
body.light-mode .search-box input {
    background: rgba(0,0,0,0.03);
    border-color: rgba(0,0,0,0.15);
    color: #1a1a2e;
}
.search-box button {
    padding: 12px 24px;
    border-radius: 50px;
    border: none;
    background: #ff6b35;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}
.search-box button:hover {
    background: #ff4a2e;
}
/* 面包屑 */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 16px 0;
    font-size: 0.9rem;
    opacity: 0.7;
}
.breadcrumb a:hover {
    color: #ff6b35;
}
/* 文章卡片 */
.article-card {
    padding: 20px;
}
.article-card h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}
.article-card .date {
    font-size: 0.85rem;
    opacity: 0.6;
    margin-bottom: 10px;
}
.article-card p {
    margin-bottom: 16px;
}
.article-card .read-more {
    color: #ff6b35;
    font-weight: 600;
    cursor: pointer;
}
/* 页脚 */
footer {
    background: rgba(0,0,0,0.3);
    padding: 60px 0 30px;
    border-top: 1px solid rgba(255,255,255,0.05);
}
body.light-mode footer {
    background: rgba(0,0,0,0.02);
    border-color: rgba(0,0,0,0.05);
}
.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}
.footer-col h4 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: #ff6b35;
}
.footer-col ul {
    list-style: none;
}
.footer-col ul li {
    margin-bottom: 8px;
    opacity: 0.7;
    transition: opacity 0.2s;
}
.footer-col ul li:hover {
    opacity: 1;
}
.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255,255,255,0.05);
    font-size: 0.85rem;
    opacity: 0.6;
}
/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: #ff6b35;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s, transform 0.3s;
    box-shadow: 0 4px 20px rgba(255,107,53,0.4);
    z-index: 999;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}
.back-to-top:hover {
    transform: scale(1.1);
}
/* 动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}
/* 响应式 */
@media (max-width: 768px) {
    nav ul { display: none; }
    .menu-toggle { display: block; }
    .mobile-nav.open { display: block; }
    .hero-text h1 { font-size: 2.2rem; }
    .hero { padding: 120px 0 60px; }
    .section-title { font-size: 1.8rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
    .hero-text h1 { font-size: 1.8rem; }
    .btn-primary { padding: 12px 28px; }
}