/* ========== 基础重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ========== 变量定义 ========== */
:root {
    --primary-dark: #0a0a14;
    --primary-darker: #05050a;
    --secondary-dark: #11111a;
    --accent-blue: #00d4ff;
    --accent-purple: #7b2cbf;
    --accent-glow: rgba(0, 212, 255, 0.15);
    --text-white: #ffffff;
    --text-gray: #c4c4cc;
    --text-muted: #88889a;
    --border-dark: #1f1f2a;
    --card-bg: rgba(17, 17, 26, 0.8);
    --card-bg-solid: #11111a;
    --transition-fast: 0.3s ease;
    --transition-slow: 0.6s ease;
}

/* ========== 全局样式 ========== */
body {
    font-family: 'Inter', sans-serif;
    background-color: var(--primary-dark);
    color: var(--text-white);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== 导航栏与语言下拉框（对齐优化） ========== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(5, 5, 10, 0.95);
    backdrop-filter: blur(12px);
    z-index: 1000;
    border-bottom: 1px solid #1f1f2a;
    transition: all 0.3s ease;
    min-height: 70px;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    max-width: 1280px;
    margin: 0 auto;
    height: 70px;
}

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

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #ffffff, #00d4ff);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
    margin: 0;
    padding: 0;
    align-items: center;
}

.nav-links li a {
    text-decoration: none;
    color: #c4c4cc;
    font-weight: 500;
    transition: 0.3s;
    position: relative;
    white-space: nowrap;
}

.nav-links li a:hover,
.nav-links li a.active {
    color: #00d4ff;
}

.nav-links li a.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, #00d4ff, #7b2cbf);
}

.language-dropdown {
    display: flex;
    align-items: center;
}

.lang-select {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid #1f1f2a;
    color: #ffffff;
    padding: 8px 28px 8px 16px;
    border-radius: 30px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='white'><path d='M7 10l5 5 5-5z'/></svg>");
    background-repeat: no-repeat;
    background-position: right 12px center;
    transition: all 0.3s;
    line-height: 1.2;
}

.lang-select:hover {
    background-color: rgba(0, 212, 255, 0.15);
    border-color: #00d4ff;
    color: #00d4ff;
}

.lang-select option {
    background: #0a0a14;
    color: #fff;
}

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: #05050a;
        flex-direction: column;
        align-items: flex-start;
        padding: 32px;
        transition: 0.3s;
        z-index: 999;
        gap: 24px;
    }
    .nav-menu.active {
        left: 0;
    }
    .nav-links {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
        gap: 24px;
    }
    .language-dropdown {
        margin-left: 0;
        margin-top: 16px;
    }
}

/* ========== Hero 区块（科技感动效） ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding: 120px 0 80px;
}

#hero-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 30% 50%, rgba(5, 5, 10, 0.7), var(--primary-darker));
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    background: rgba(0, 212, 255, 0.1);
    backdrop-filter: blur(4px);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--accent-blue);
    letter-spacing: 1px;
    margin-bottom: 24px;
    border: 1px solid rgba(0, 212, 255, 0.2);
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--text-white) 0%, var(--accent-blue) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--accent-blue);
    margin-bottom: 16px;
    font-weight: 500;
}

.hero-description {
    color: var(--text-gray);
    margin-bottom: 24px;
    line-height: 1.8;
}

.hero-quote {
    font-size: 1.125rem;
    font-style: italic;
    color: var(--text-muted);
    margin-bottom: 32px;
    padding-left: 20px;
    border-left: 3px solid var(--accent-blue);
}

/* ========== 按钮样式 ========== */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: var(--primary-dark);
    padding: 14px 32px;
    border-radius: 40px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition-fast);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
    gap: 12px;
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    border: 1px solid var(--accent-blue);
    color: var(--accent-blue);
    padding: 12px 28px;
    border-radius: 40px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    cursor: pointer;
}

.btn-outline:hover {
    background: var(--accent-blue);
    color: var(--primary-dark);
    gap: 12px;
}

/* ========== 通用区块样式 ========== */
.section {
    padding: 100px 0;
    border-bottom: 1px solid var(--border-dark);
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    background: rgba(0, 212, 255, 0.08);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--accent-blue);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-white), var(--text-gray));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ========== 关于我们 ========== */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 48px;
    align-items: start;
}

.about-text {
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-text.highlight {
    font-size: 1.125rem;
    color: var(--text-white);
    border-left: 3px solid var(--accent-blue);
    padding-left: 20px;
    font-weight: 500;
}

.stat-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 24px;
    text-align: center;
    border: 1px solid var(--border-dark);
    transition: var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-blue);
    box-shadow: 0 10px 30px var(--accent-glow);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-blue);
    margin-bottom: 8px;
}

.stat-unit {
    font-size: 1.25rem;
    font-weight: 400;
}

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

/* ========== 地区分布（国家卡片） ========== */
.locations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.location-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 28px;
    border: 1px solid var(--border-dark);
    transition: var(--transition-fast);
    cursor: pointer;
}

.location-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-blue);
    box-shadow: 0 10px 30px var(--accent-glow);
}

.location-icon {
    width: 48px;
    height: 48px;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.location-icon i {
    font-size: 1.5rem;
    color: var(--accent-blue);
}

.location-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.location-detail {
    color: var(--text-muted);
    font-size: 0.875rem;
    line-height: 1.5;
}

/* ========== 职业发展 ========== */
.careers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.career-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 32px;
    text-align: center;
    border: 1px solid var(--border-dark);
    transition: var(--transition-fast);
}

.career-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-blue);
}

.career-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(123, 44, 191, 0.15));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.career-icon i {
    font-size: 1.75rem;
    color: var(--accent-blue);
}

.career-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.career-desc {
    color: var(--text-muted);
    font-size: 0.875rem;
    line-height: 1.6;
}

.careers-cta {
    text-align: center;
}

/* ========== 我们的团队（左右错开高级特效） ========== */
.team-alternating {
    display: flex;
    flex-direction: column;
    gap: 48px;
}

.team-row {
    background: rgba(17, 17, 26, 0.7);
    backdrop-filter: blur(12px);
    border-radius: 28px;
    padding: 32px;
    margin-bottom: 48px;
    border: 1px solid rgba(0, 212, 255, 0.2);
    transition: all 0.4s cubic-bezier(0.2, 0.9, 0.4, 1.1);
    position: relative;
    overflow: hidden;
}

.team-row::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.15), transparent);
    transition: left 0.6s;
}

.team-row:hover::before {
    left: 100%;
}

.team-row:hover {
    transform: translateY(-8px) scale(1.01);
    border-color: #00d4ff;
    box-shadow: 0 20px 40px rgba(0, 212, 255, 0.2), 0 0 0 1px rgba(0, 212, 255, 0.3);
    background: rgba(17, 17, 26, 0.9);
}

.team-row.left .team-photo {
    order: 1;
}

.team-row.left .team-info {
    order: 2;
}

.team-row.right .team-photo {
    order: 2;
}

.team-row.right .team-info {
    order: 1;
}

.team-photo {
    flex: 1;
    text-align: center;
}

.team-photo img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--accent-blue);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

.team-info {
    flex: 2;
}

.team-name {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.team-title {
    color: var(--accent-blue);
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 16px;
}

.team-bio {
    color: var(--text-gray);
    line-height: 1.6;
}

@media (max-width: 768px) {
    .team-row {
        flex-direction: column;
        text-align: center;
    }
    .team-row.left .team-photo,
    .team-row.right .team-photo {
        order: 1;
    }
    .team-photo img {
        width: 120px;
        height: 120px;
    }
}

/* 团队合影 */
.team-group-photo {
    margin: 40px auto;
    max-width: 800px;
    border-radius: 24px;
    overflow: hidden;
    text-align: center;
}

.team-group-photo img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* ========== 新闻 ========== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    margin-bottom: 48px;
}

.news-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 24px;
    border: 1px solid var(--border-dark);
    transition: var(--transition-fast);
    cursor: pointer;
}

.news-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-blue);
}

.news-date {
    color: var(--accent-blue);
    font-size: 0.75rem;
    margin-bottom: 12px;
    font-weight: 500;
}

.news-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
}

.news-excerpt {
    color: var(--text-muted);
    font-size: 0.875rem;
    line-height: 1.5;
}

.news-cta {
    text-align: center;
}

/* ========== 新闻模态框 ========== */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--card-bg);
    margin: 10% auto;
    padding: 32px;
    border-radius: 24px;
    width: 80%;
    max-width: 700px;
    border: 1px solid var(--accent-blue);
    position: relative;
}

.modal-close {
    position: absolute;
    right: 20px;
    top: 15px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    color: var(--text-gray);
}

.modal-close:hover {
    color: var(--accent-blue);
}

.modal-date {
    color: var(--accent-blue);
    margin: 10px 0 20px;
}

.modal-body {
    line-height: 1.8;
    color: var(--text-gray);
}

/* ========== location-detail.html 数据中心详情页样式 ========== */
/* 数据中心主卡片 */
.data-center-card {
    background: rgba(17, 17, 26, 0.7);
    backdrop-filter: blur(12px);
    border-radius: 32px;
    padding: 32px;
    margin-bottom: 48px;
    border: 1px solid rgba(0, 212, 255, 0.2);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.data-center-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.4s;
}

.data-center-card:hover::after {
    opacity: 1;
}

.data-center-card:hover {
    transform: translateY(-8px);
    border-color: #00d4ff;
    box-shadow: 0 25px 45px rgba(0, 212, 255, 0.25);
    background: rgba(17, 17, 26, 0.9);
}

.dc-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff, #00d4ff);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.dc-description {
    color: #c4c4cc;
    line-height: 1.6;
    margin-bottom: 24px;
    font-size: 1rem;
}

/* 规格卡片网格 */
.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

/* ===== 优化规格卡片 spec-card（科技感+扫光+动画） ===== */
.spec-card {
    background: rgba(0, 212, 255, 0.03);
    border-radius: 20px;
    padding: 20px;
    border: 1px solid rgba(0, 212, 255, 0.15);
    transition: all 0.35s cubic-bezier(0.2, 0.9, 0.4, 1.1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(4px);
}

.spec-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.15), transparent);
    transition: left 0.5s;
}

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

.spec-card:hover {
    transform: translateY(-6px);
    background: rgba(0, 212, 255, 0.1);
    border-color: #00d4ff;
    box-shadow: 0 12px 25px rgba(0, 212, 255, 0.2);
}

.spec-icon {
    font-size: 2rem;
    color: #00d4ff;
    margin-bottom: 16px;
    transition: transform 0.3s;
}

.spec-card:hover .spec-icon {
    transform: scale(1.1);
}

.spec-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: #00d4ff;
    font-weight: 600;
    margin-bottom: 8px;
}

.spec-value {
    font-size: 0.95rem;
    color: #f0f0f0;
    line-height: 1.5;
    font-weight: 500;
}

/* 轮播图样式 */
.carousel-container {
    position: relative;
    max-width: 800px;
    margin: 2rem auto;
    overflow: hidden;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.carousel-slides {
    display: flex;
    transition: transform 0.5s ease;
}

.carousel-slide {
    min-width: 100%;
    box-sizing: border-box;
}

.carousel-slide img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    background: #1a1a2e;
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.6);
    color: white;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    padding: 0 12px;
    border-radius: 50%;
    z-index: 10;
    transition: all 0.3s;
}

.carousel-btn:hover {
    background: #00d4ff;
    color: #05050a;
}

.carousel-btn.prev {
    left: 10px;
}

.carousel-btn.next {
    right: 10px;
}

.carousel-dots {
    text-align: center;
    margin-top: 10px;
}

.dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    background: #888;
    border-radius: 50%;
    margin: 0 5px;
    cursor: pointer;
    transition: all 0.3s;
}

.dot:hover {
    background: #00d4ff;
    transform: scale(1.2);
}

.dot.active {
    background: #00d4ff;
}

/* 返回地图链接 */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin: 30px 0 20px;
    color: #00d4ff;
    text-decoration: none;
    font-weight: 500;
    background: rgba(0, 212, 255, 0.1);
    padding: 8px 20px;
    border-radius: 40px;
    transition: 0.3s;
}

.back-link:hover {
    background: #00d4ff;
    color: #05050a;
    gap: 12px;
}

/* ========== 页脚 ========== */
.footer {
    background: var(--primary-darker);
    padding: 64px 0 32px;
    border-top: 1px solid var(--border-dark);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-white), var(--accent-blue));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.footer-tagline {
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-top: 8px;
}

.footer-column h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-white);
}

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

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

.footer-column ul li a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition-fast);
    font-size: 0.875rem;
}

.footer-column ul li a:hover {
    color: var(--accent-blue);
}

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-gray);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-social a:hover {
    background: var(--accent-blue);
    color: var(--primary-dark);
}

.footer-bottom {
    text-align: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-dark);
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* ========== 响应式增强 ========== */
@media (max-width: 992px) {
    .hero-title {
        font-size: 3rem;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .about-stats {
        display: flex;
        gap: 20px;
        justify-content: center;
    }
    .stat-card {
        flex: 1;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    .section-title {
        font-size: 2rem;
    }
    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
        text-align: center;
    }
    .footer-social {
        justify-content: center;
    }
    .carousel-slide img {
        height: 250px;
    }
    .specs-grid {
        grid-template-columns: 1fr;
    }
    .data-center-card {
        padding: 20px;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 16px;
    }
    .section {
        padding: 60px 0;
    }
    .hero-title {
        font-size: 1.75rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .locations-grid,
    .careers-grid,
    .team-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== 辅助工具类 ========== */
.text-accent {
    color: var(--accent-blue);
}

.bg-glow {
    box-shadow: 0 0 20px var(--accent-glow);
}

.rounded-full {
    border-radius: 9999px;
}

/* ========== 历史时间轴样式 ========== */
.timeline-section {
    padding: 60px 0;
    background: transparent;
}

.timeline {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 0;
}

/* 中间连线 */
.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, transparent, var(--accent-blue), transparent);
    transform: translateX(-50%);
}

/* 时间轴卡片通用样式 */
.timeline-item {
    display: flex;
    justify-content: flex-end;
    padding-right: 30px;
    margin-bottom: 60px;
    position: relative;
    width: 50%;
}

.timeline-item:nth-child(even) {
    align-self: flex-end;
    justify-content: flex-start;
    padding-right: 0;
    padding-left: 30px;
    margin-left: auto;
}

/* 年份圆点 */
.timeline-dot {
    position: absolute;
    right: -11px;
    top: 20px;
    width: 20px;
    height: 20px;
    background: var(--accent-blue);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.2);
    z-index: 2;
}

.timeline-item:nth-child(even) .timeline-dot {
    right: auto;
    left: -11px;
}

/* 年份标签 */
.timeline-year {
    position: absolute;
    top: 12px;
    right: -80px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-blue);
    background: rgba(0, 212, 255, 0.1);
    padding: 4px 12px;
    border-radius: 30px;
    white-space: nowrap;
}

.timeline-item:nth-child(even) .timeline-year {
    right: auto;
    left: -80px;
}

/* 卡片内容 */
.timeline-card {
    background: rgba(17, 17, 26, 0.7);
    backdrop-filter: blur(12px);
    border-radius: 24px;
    padding: 24px;
    width: 100%;
    border: 1px solid rgba(0, 212, 255, 0.2);
    transition: all 0.4s cubic-bezier(0.2, 0.9, 0.4, 1.1);
    position: relative;
    overflow: hidden;
}

.timeline-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.1), transparent);
    transition: left 0.5s;
}

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

.timeline-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-blue);
    box-shadow: 0 15px 30px rgba(0, 212, 255, 0.15);
    background: rgba(17, 17, 26, 0.85);
}

.timeline-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-white);
    line-height: 1.4;
}

.timeline-description {
    font-size: 0.9rem;
    color: var(--text-gray);
    line-height: 1.6;
}

/* 响应式：手机端改为垂直排列 */
@media (max-width: 768px) {
    .timeline::before {
        left: 20px;
    }
    .timeline-item,
    .timeline-item:nth-child(even) {
        width: 100%;
        padding-left: 50px;
        padding-right: 0;
        justify-content: flex-start;
    }
    .timeline-dot {
        left: 9px !important;
        right: auto !important;
    }
    .timeline-year {
        left: auto !important;
        right: auto !important;
        position: relative;
        display: inline-block;
        margin-bottom: 12px;
        top: 0;
    }
    .timeline-card {
        width: 100%;
    }
}