/* ===== 基础重置与全局变量 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #e94560;
    --primary-dark: #c23152;
    --primary-light: #ff6b6b;
    --bg-dark: #0f0f1a;
    --bg-light: #f5f5fa;
    --text-dark: #e0e0e0;
    --text-light: #1a1a2e;
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --gradient-1: #1a1a2e;
    --gradient-2: #16213e;
    --gradient-3: #0f3460;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --radius: 20px;
    --radius-sm: 15px;
    --radius-btn: 50px;
    --transition: all 0.3s ease;
    --font: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

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

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

body.light-mode {
    --card-bg: rgba(255, 255, 255, 0.8);
    --card-border: rgba(0, 0, 0, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
    --gradient-1: #e8e8f0;
    --gradient-2: #d0d0e0;
    --gradient-3: #b0b0d0;
}

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

/* ===== 毛玻璃效果 ===== */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
}

/* ===== 渐变背景 ===== */
.gradient-bg {
    background: linear-gradient(135deg, var(--gradient-1) 0%, var(--gradient-2) 50%, var(--gradient-3) 100%);
}

body.light-mode .gradient-bg {
    background: linear-gradient(135deg, var(--gradient-1) 0%, var(--gradient-2) 50%, var(--gradient-3) 100%);
}

/* ===== 按钮 ===== */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: var(--radius-btn);
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(233, 69, 96, 0.4);
}

.btn:active {
    transform: translateY(-1px);
}

/* ===== 区块通用 ===== */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

body.light-mode .section-title {
    -webkit-text-fill-color: var(--primary);
    background: none;
    color: var(--primary);
}

.section-sub {
    text-align: center;
    color: #aaa;
    margin-bottom: 60px;
    font-size: 1.1rem;
}

body.light-mode .section-sub {
    color: #555;
}

/* ===== 导航 ===== */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 15px 0;
    transition: var(--transition);
}

nav.scrolled {
    background: rgba(15, 15, 26, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

body.light-mode nav.scrolled {
    background: rgba(245, 245, 250, 0.95);
}

.nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.nav-links {
    display: flex;
    gap: 30px;
    list-style: none;
}

.nav-links a {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

body.light-mode .nav-links a {
    color: var(--text-light);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width 0.3s;
}

.nav-links a:hover::after {
    width: 100%;
}

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

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

.menu-toggle span {
    width: 30px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 3px;
    transition: var(--transition);
}

body.light-mode .menu-toggle span {
    background: var(--text-light);
}

.dark-toggle {
    background: none;
    border: none;
    color: var(--text-dark);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
    transition: transform 0.3s;
}

.dark-toggle:hover {
    transform: rotate(15deg);
}

body.light-mode .dark-toggle {
    color: var(--text-light);
}

/* ===== Hero 区域 ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background:
        radial-gradient(circle at 30% 50%, rgba(233, 69, 96, 0.1), transparent 60%),
        radial-gradient(circle at 70% 50%, rgba(15, 52, 96, 0.2), transparent 60%);
    animation: heroFloat 20s ease-in-out infinite;
}

@keyframes heroFloat {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(-5%, -5%); }
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-text h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-text h1 span {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

body.light-mode .hero-text h1 span {
    -webkit-text-fill-color: var(--primary);
    background: none;
    color: var(--primary);
}

.hero-text p {
    font-size: 1.2rem;
    color: #aaa;
    margin-bottom: 30px;
    max-width: 500px;
}

body.light-mode .hero-text p {
    color: #555;
}

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

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-card {
    width: 100%;
    max-width: 450px;
    padding: 40px;
    text-align: center;
    animation: cardFloat 6s ease-in-out infinite;
}

@keyframes cardFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.hero-card .card-icon {
    font-size: 6rem;
    margin-bottom: 20px;
}

.hero-card h3 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.hero-card p {
    color: #aaa;
}

body.light-mode .hero-card p {
    color: #555;
}

/* ===== Banner 轮播 ===== */
.banner-carousel {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius);
    margin: 40px 0;
    height: 400px;
}

.banner-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.8s ease;
    padding: 40px;
    text-align: center;
}

.banner-slide.active {
    opacity: 1;
}

.banner-slide h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.banner-slide p {
    font-size: 1.2rem;
    max-width: 600px;
    color: #ccc;
}

body.light-mode .banner-slide p {
    color: #444;
}

.banner-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
}

.banner-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: var(--transition);
}

.banner-dots span.active {
    background: var(--primary);
    transform: scale(1.3);
}

/* ===== 网格布局 ===== */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

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

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

/* ===== 卡片 ===== */
.card {
    padding: 30px;
    border-radius: var(--radius);
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

.card p {
    color: #aaa;
    font-size: 0.95rem;
}

body.light-mode .card p {
    color: #555;
}

/* ===== 统计数据 ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    text-align: center;
}

.stat-item .stat-number {
    font-size: 3rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

body.light-mode .stat-item .stat-number {
    -webkit-text-fill-color: var(--primary);
    background: none;
    color: var(--primary);
}

.stat-item p {
    color: #aaa;
    margin-top: 5px;
}

body.light-mode .stat-item p {
    color: #555;
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary), transparent);
}

.timeline-item {
    position: relative;
    padding: 20px 0;
    padding-left: 30px;
    opacity: 0;
    transform: translateX(-30px);
    transition: all 0.6s ease;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -27px;
    top: 25px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid var(--bg-dark);
}

body.light-mode .timeline-item::before {
    border-color: var(--bg-light);
}

.timeline-item .year {
    font-weight: 800;
    color: var(--primary);
    font-size: 1.2rem;
}

.timeline-item h3 {
    margin: 5px 0;
}

.timeline-item p {
    color: #aaa;
    font-size: 0.95rem;
}

body.light-mode .timeline-item p {
    color: #555;
}

/* ===== FAQ 手风琴 ===== */
.faq-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 15px 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;
    padding: 10px 0;
    user-select: none;
}

.faq-question .icon {
    font-size: 1.5rem;
    transition: transform 0.3s;
    color: var(--primary);
}

.faq-item.open .faq-question .icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    color: #aaa;
    padding-left: 10px;
}

body.light-mode .faq-answer {
    color: #555;
}

.faq-item.open .faq-answer {
    max-height: 300px;
    padding-bottom: 15px;
}

/* ===== HowTo 步骤 ===== */
.howto-steps {
    counter-reset: step;
}

.howto-step {
    display: flex;
    gap: 20px;
    padding: 20px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    align-items: flex-start;
}

body.light-mode .howto-step {
    border-color: rgba(0, 0, 0, 0.1);
}

.howto-step::before {
    counter-increment: step;
    content: counter(step);
    min-width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.2rem;
    color: #fff;
    flex-shrink: 0;
}

.howto-step h3 {
    margin-bottom: 5px;
}

.howto-step p {
    color: #aaa;
    font-size: 0.95rem;
}

body.light-mode .howto-step p {
    color: #555;
}

/* ===== 联系方式 ===== */
.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px;
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform 0.3s;
}

.contact-item:hover {
    transform: translateY(-5px);
}

body.light-mode .contact-item {
    background: rgba(255, 255, 255, 0.8);
}

.contact-item .icon {
    font-size: 2rem;
    color: var(--primary);
}

/* ===== 页脚 ===== */
footer {
    background: rgba(0, 0, 0, 0.3);
    padding: 60px 0 30px;
    margin-top: 40px;
}

body.light-mode footer {
    background: rgba(0, 0, 0, 0.05);
}

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

.footer-col h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--primary);
}

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

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    color: #aaa;
    text-decoration: none;
    transition: color 0.3s;
}

body.light-mode .footer-col ul li a {
    color: #555;
}

.footer-col ul li a:hover {
    color: var(--primary);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    margin-top: 40px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 15px;
    font-size: 0.9rem;
    color: #aaa;
}

body.light-mode .footer-bottom {
    border-color: rgba(0, 0, 0, 0.1);
    color: #555;
}

.footer-bottom a {
    color: var(--primary);
    text-decoration: none;
}

/* ===== 返回顶部 ===== */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

#backToTop.visible {
    opacity: 1;
    visibility: visible;
}

#backToTop:hover {
    transform: scale(1.1);
}

/* ===== 搜索框 ===== */
.search-box {
    display: flex;
    gap: 10px;
    max-width: 400px;
    margin: 0 auto;
}

.search-box input {
    flex: 1;
    padding: 12px 20px;
    border-radius: var(--radius-btn);
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-dark);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s;
}

body.light-mode .search-box input {
    background: rgba(255, 255, 255, 0.8);
    border-color: rgba(0, 0, 0, 0.2);
    color: var(--text-light);
}

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

.search-box button {
    padding: 12px 25px;
    border-radius: var(--radius-btn);
    background: var(--primary);
    color: #fff;
    border: none;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s;
}

.search-box button:hover {
    background: var(--primary-dark);
}

/* ===== 新闻卡片 ===== */
.news-card .date {
    color: var(--primary);
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.news-card h3 {
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.news-card a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    margin-top: 10px;
    transition: color 0.3s;
}

.news-card a:hover {
    color: var(--primary-light);
}

/* ===== 合作伙伴 ===== */
.partner-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}

.partner-item {
    padding: 20px 30px;
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    font-weight: 600;
    font-size: 1.1rem;
    border: 1px solid var(--card-border);
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

body.light-mode .partner-item {
    background: rgba(255, 255, 255, 0.8);
    border-color: rgba(0, 0, 0, 0.1);
}

.partner-item:hover {
    transform: scale(1.05);
    border-color: var(--primary);
}

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

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

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

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

body.light-mode ::-webkit-scrollbar-track {
    background: var(--bg-light);
}

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

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

/* ===== 无障碍 ===== */
:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text p {
        margin: 0 auto 30px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-card {
        max-width: 350px;
        margin: 0 auto;
    }

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        flex-direction: column;
        background: rgba(15, 15, 26, 0.98);
        padding: 20px;
        gap: 15px;
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
    }

    body.light-mode .nav-links {
        background: rgba(245, 245, 250, 0.98);
    }

    .nav-links.active {
        display: flex;
    }

    .menu-toggle {
        display: flex;
    }

    .grid-2,
    .grid-3,
    .grid-4,
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .banner-carousel {
        height: 300px;
    }

    .banner-slide h2 {
        font-size: 1.8rem;
    }

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

    .hero-text h1 {
        font-size: 2.2rem;
    }
}

@media (max-width: 480px) {
    .hero-text h1 {
        font-size: 2rem;
    }

    .btn {
        padding: 10px 24px;
        font-size: 0.9rem;
    }

    .section {
        padding: 50px 0;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .hero-card {
        padding: 25px;
    }

    .hero-card .card-icon {
        font-size: 4rem;
    }

    .banner-carousel {
        height: 250px;
    }

    .banner-slide h2 {
        font-size: 1.5rem;
    }

    .banner-slide p {
        font-size: 1rem;
    }

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