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

:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #111638;
    --bg-card: rgba(255, 255, 255, 0.05);
    --text-primary: #ffffff;
    --text-secondary: #b0b8d1;
    --accent: #ff6b35;
    --accent-hover: #ff8555;
    --glass-bg: rgba(255, 255, 255, 0.08);
    --glass-border: rgba(255, 255, 255, 0.12);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --radius: 16px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-card: rgba(0, 0, 0, 0.03);
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a6a;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.08);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background var(--transition), color var(--transition);
}

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

a:hover {
    color: var(--accent-hover);
}

img, svg {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 头部导航 */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 14, 39, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    transition: background var(--transition), box-shadow var(--transition);
}

[data-theme="light"] header {
    background: rgba(255, 255, 255, 0.85);
}

header.scrolled {
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
}

.logo svg {
    width: 40px;
    height: 40px;
}

.logo span {
    background: linear-gradient(135deg, var(--accent), #ff9a56);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

nav a {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    position: relative;
    padding: 4px 0;
}

nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition);
}

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.theme-toggle, .menu-toggle, .search-toggle {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
    font-size: 18px;
}

.theme-toggle:hover, .menu-toggle:hover, .search-toggle:hover {
    background: var(--glass-border);
    transform: scale(1.05);
}

.menu-toggle {
    display: none;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--glass-border);
    padding: 20px 24px;
    flex-direction: column;
    gap: 16px;
    z-index: 999;
    backdrop-filter: blur(20px);
}

.mobile-menu.open {
    display: flex;
}

.mobile-menu a {
    color: var(--text-secondary);
    font-size: 16px;
    padding: 8px 0;
}

/* 搜索覆盖层 */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.search-overlay.open {
    display: flex;
}

.search-box {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 24px;
    width: 100%;
    max-width: 600px;
    box-shadow: var(--shadow);
}

.search-box input {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid var(--glass-border);
    border-radius: 12px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 16px;
    outline: none;
    transition: border-color var(--transition);
}

.search-box input:focus {
    border-color: var(--accent);
}

.search-box .search-results {
    margin-top: 16px;
    max-height: 300px;
    overflow-y: auto;
}

.search-box .search-results div {
    padding: 12px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: background var(--transition);
    color: var(--text-secondary);
}

.search-box .search-results div:hover {
    background: var(--glass-bg);
    color: var(--text-primary);
}

.search-close {
    position: absolute;
    top: 24px;
    right: 24px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 英雄横幅 */
.hero {
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
    min-height: 80vh;
    display: flex;
    align-items: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 80%;
    height: 120%;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.15), transparent 70%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    right: -10%;
    width: 60%;
    height: 80%;
    background: radial-gradient(circle, rgba(255, 154, 86, 0.1), transparent 70%);
    pointer-events: none;
}

.hero-slider {
    position: relative;
    width: 100%;
}

.hero-slide {
    display: none;
    animation: fadeSlide 0.6s ease;
}

.hero-slide.active {
    display: flex;
    align-items: center;
    gap: 48px;
    flex-wrap: wrap;
}

@keyframes fadeSlide {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-content {
    flex: 1 1 500px;
}

.hero-content h1 {
    font-size: clamp(32px, 5vw, 56px);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #fff, #b0b8d1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

[data-theme="light"] .hero-content h1 {
    background: linear-gradient(135deg, #1a1a2e, #4a4a6a);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 600px;
}

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

.btn {
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #ff9a56);
    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-secondary {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--glass-border);
    transform: translateY(-2px);
}

.hero-visual {
    flex: 1 1 400px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-visual svg {
    width: 100%;
    max-width: 500px;
    filter: drop-shadow(0 20px 60px rgba(255, 107, 53, 0.2));
}

.slider-controls {
    display: flex;
    gap: 12px;
    margin-top: 32px;
}

.slider-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--glass-border);
    border: none;
    cursor: pointer;
    transition: background var(--transition), transform var(--transition);
}

.slider-dot.active {
    background: var(--accent);
    transform: scale(1.3);
}

/* 通用区块 */
section {
    padding: 80px 0;
    position: relative;
}

.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 700;
    margin-bottom: 16px;
    text-align: center;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 700px;
    margin: 0 auto 48px;
}

.section-divider {
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--accent), #ff9a56);
    margin: 12px auto 24px;
    border-radius: 4px;
}

/* 卡片网格 */
.grid-2, .grid-3, .grid-4 {
    display: grid;
    gap: 24px;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 28px 24px;
    backdrop-filter: blur(10px);
    transition: all var(--transition);
    cursor: default;
    position: relative;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow);
    border-color: var(--accent);
}

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

.card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

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

/* 统计数字 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 24px;
    background: var(--glass-bg);
    border-radius: var(--radius);
    border: 1px solid var(--glass-border);
}

.stat-number {
    font-size: 48px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), #ff9a56);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 8px;
}

/* 时间线 */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 16px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--accent), transparent);
}

.timeline-item {
    position: relative;
    margin-bottom: 32px;
    padding: 20px 24px;
    background: var(--glass-bg);
    border-radius: var(--radius);
    border: 1px solid var(--glass-border);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -28px;
    top: 24px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid var(--bg-primary);
}

.timeline-year {
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 4px;
}

/* 推荐卡片 */
.testimonial-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 28px;
    position: relative;
}

.testimonial-card::before {
    content: '"';
    font-size: 60px;
    color: var(--accent);
    opacity: 0.3;
    position: absolute;
    top: 8px;
    left: 16px;
    font-family: serif;
}

.testimonial-card p {
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 16px;
}

.testimonial-author {
    font-weight: 600;
    color: var(--text-primary);
}

/* FAQ */
.faq-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
    transition: border-color var(--transition);
}

.faq-item:hover {
    border-color: var(--accent);
}

.faq-question {
    padding: 20px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 16px;
    user-select: none;
}

.faq-question .faq-icon {
    transition: transform var(--transition);
    font-size: 20px;
}

.faq-item.open .faq-question .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    padding: 0 24px;
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

.faq-item.open .faq-answer {
    max-height: 400px;
    padding: 0 24px 20px;
}

/* 操作步骤 */
.howto-steps {
    counter-reset: step;
}

.howto-step {
    display: flex;
    gap: 20px;
    margin-bottom: 24px;
    padding: 20px 24px;
    background: var(--glass-bg);
    border-radius: var(--radius);
    border: 1px solid var(--glass-border);
    align-items: flex-start;
}

.howto-step::before {
    counter-increment: step;
    content: counter(step);
    background: var(--accent);
    color: #fff;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

/* 联系 */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.contact-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
}

.contact-item .icon {
    font-size: 36px;
    margin-bottom: 12px;
}

/* 页脚 */
footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--glass-border);
    padding: 48px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.footer-col h4 {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.footer-col a, .footer-col p {
    display: block;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 8px;
    transition: color var(--transition);
}

.footer-col a:hover {
    color: var(--accent);
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-size: 13px;
}

.footer-bottom a {
    color: var(--text-secondary);
}

.footer-bottom a:hover {
    color: var(--accent);
}

/* 回到顶部 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    border: none;
    font-size: 24px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(255, 107, 53, 0.3);
    transition: all var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(255, 107, 53, 0.4);
}

/* 文章卡片 */
.article-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 24px;
    transition: all var(--transition);
}

.article-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.article-card .date {
    color: var(--accent);
    font-size: 13px;
    margin-bottom: 8px;
}

.article-card h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.article-card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 12px;
}

.article-card .read-more {
    font-weight: 600;
    font-size: 14px;
    color: var(--accent);
    cursor: pointer;
    display: inline-block;
}

/* 响应式 */
@media (max-width: 768px) {
    .header-inner {
        padding: 12px 16px;
    }
    nav {
        display: none;
    }
    .menu-toggle {
        display: flex;
    }
    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }
    .hero-slide.active {
        flex-direction: column;
        gap: 32px;
    }
    .hero-content {
        text-align: center;
    }
    .hero-content p {
        margin-left: auto;
        margin-right: auto;
    }
    .hero-buttons {
        justify-content: center;
    }
    .slider-controls {
        justify-content: center;
    }
    section {
        padding: 60px 0;
    }
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
    .timeline {
        padding-left: 24px;
    }
    .timeline::before {
        left: 8px;
    }
    .timeline-item::before {
        left: -16px;
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .hero-content h1 {
        font-size: 28px;
    }
    .btn {
        padding: 12px 24px;
        font-size: 14px;
    }
    .stat-number {
        font-size: 36px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* 淡入动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 面包屑 */
.breadcrumb {
    display: flex;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    padding: 16px 0;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--text-secondary);
}

.breadcrumb a:hover {
    color: var(--accent);
}

.breadcrumb span {
    color: var(--text-secondary);
}

/* 合作伙伴 */
.partner-logos {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    justify-content: center;
    align-items: center;
}

.partner-logos svg {
    width: 120px;
    height: 60px;
    opacity: 0.6;
    transition: opacity var(--transition);
}

.partner-logos svg:hover {
    opacity: 1;
}

/* 地图占位 */
.map-placeholder {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 18px;
}

/* 滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}