/* ===== 全局重置与基础 ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #1a1a2e;
    --secondary: #16213e;
    --accent: #ffd700;
    --accent2: #e94560;
    --glass: rgba(255, 255, 255, 0.12);
    --glass-border: rgba(255, 255, 255, 0.18);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    --radius: 20px;
    --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --bg-gradient: linear-gradient(135deg, #0f0c29, #302b63, #24243e);
    --text: #f0f0f0;
    --text-dark: #1a1a2e;
    --card-bg: rgba(255, 255, 255, 0.06);
    --max-width: 1200px;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-gradient);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    transition: background 0.5s, color 0.5s;
}

/* 浅色模式 */
body.light-mode {
    --bg-gradient: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    --text: #1a1a2e;
    --card-bg: rgba(0, 0, 0, 0.04);
    --glass: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.8);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

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

a:hover {
    color: var(--accent2);
}

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

ul {
    list-style: none;
}

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

/* ===== 玻璃拟态通用 ===== */
.glass, .card, .banner-slide, .article-card, .faq-item, .team-card,
.partner-item, .testimonial-card, .news-card, .howto-step,
.product-card, .service-card, .solution-card, .case-card,
.milestone-item, .value-card {
    background: var(--glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s, background 0.3s;
}

.glass:hover, .card:hover, .banner-slide:hover, .article-card:hover,
.faq-item:hover, .team-card:hover, .partner-item:hover,
.testimonial-card:hover, .news-card:hover, .howto-step:hover,
.product-card:hover, .service-card:hover, .solution-card:hover,
.case-card:hover, .milestone-item:hover, .value-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

/* ===== 导航 ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(26, 26, 46, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transition: var(--transition);
}

body.light-mode header {
    background: rgba(255, 255, 255, 0.85);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    max-width: var(--max-width);
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--accent);
}

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

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav-links a {
    color: var(--text);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 6px 0;
    position: relative;
}

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

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

.nav-links a.active {
    color: var(--accent);
}

.nav-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.search-box {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 30px;
    padding: 4px 16px;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.search-box input {
    background: transparent;
    border: none;
    color: var(--text);
    padding: 8px 0;
    outline: none;
    width: 140px;
    font-size: 0.9rem;
}

.search-box input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.search-box button {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    font-size: 1.1rem;
}

.theme-toggle,
.menu-toggle {
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.3rem;
    cursor: pointer;
    padding: 4px;
    border-radius: 50%;
    transition: var(--transition);
}

.theme-toggle:hover,
.menu-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.menu-toggle {
    display: none;
}

/* 移动菜单 */
.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    height: calc(100vh - 70px);
    background: rgba(26, 26, 46, 0.98);
    backdrop-filter: blur(20px);
    z-index: 999;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 40px 20px;
    gap: 20px;
    overflow-y: auto;
}

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

.mobile-menu a {
    color: var(--text);
    font-size: 1.2rem;
    padding: 12px 0;
    width: 100%;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

/* ===== Banner ===== */
.banner-section {
    margin-top: 70px;
    position: relative;
    overflow: hidden;
    min-height: 70vh;
    display: flex;
    align-items: center;
}

.banner-slider {
    position: relative;
    width: 100%;
    height: 70vh;
    min-height: 500px;
}

.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;
    background: var(--glass);
    backdrop-filter: blur(8px);
}

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

.banner-content {
    max-width: 800px;
}

.banner-content h1 {
    font-size: 3.2rem;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.banner-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.banner-btn {
    display: inline-block;
    padding: 14px 40px;
    background: var(--accent);
    color: var(--text-dark);
    font-weight: 700;
    border-radius: 50px;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.banner-btn:hover {
    background: var(--accent2);
    color: #fff;
    transform: scale(1.04);
}

.banner-dots {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
}

.banner-dots span {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: var(--transition);
}

.banner-dots span.active {
    background: var(--accent);
    transform: scale(1.2);
}

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

.section-title {
    text-align: center;
    font-size: 2.4rem;
    font-weight: 700;
    margin-bottom: 16px;
    position: relative;
}

.section-title span {
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    opacity: 0.7;
    margin-bottom: 50px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.grid-2, .grid-3, .grid-4 {
    display: grid;
    gap: 30px;
}

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

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

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

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

/* ===== 品牌故事等卡片 ===== */
.story-content,
.about-content,
.culture-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.story-text h2,
.about-text h2,
.culture-text h2 {
    font-size: 2rem;
    margin-bottom: 20px;
}

.story-text p,
.about-text p,
.culture-text p {
    margin-bottom: 16px;
    opacity: 0.85;
}

/* ===== 数字增长 ===== */
.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;
    color: var(--accent);
}

.stat-item .stat-label {
    font-size: 1rem;
    opacity: 0.7;
    margin-top: 8px;
}

/* ===== 团队 ===== */
.team-card {
    padding: 30px;
    text-align: center;
}

.team-card .avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 16px;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--text-dark);
    font-weight: 700;
}

.team-card h3 {
    font-size: 1.3rem;
    margin-bottom: 4px;
}

.team-card .role {
    color: var(--accent);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.team-card p {
    font-size: 0.95rem;
    opacity: 0.75;
}

/* ===== 产品/服务 ===== */
.product-card,
.service-card,
.solution-card,
.case-card {
    padding: 30px;
    text-align: center;
}

.product-card .icon,
.service-card .icon,
.solution-card .icon,
.case-card .icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.product-card h3,
.service-card h3,
.solution-card h3,
.case-card h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
}

.product-card p,
.service-card p,
.solution-card p,
.case-card p {
    opacity: 0.8;
    font-size: 0.95rem;
}

/* ===== 合作伙伴 ===== */
.partner-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 20px;
    align-items: center;
}

.partner-item {
    padding: 20px;
    text-align: center;
    font-weight: 600;
    font-size: 1rem;
}

/* ===== 客户评价 ===== */
.testimonial-card {
    padding: 30px;
    position: relative;
}

.testimonial-card .quote {
    font-style: italic;
    font-size: 1.05rem;
    margin-bottom: 16px;
    opacity: 0.85;
}

.testimonial-card .author {
    font-weight: 600;
    color: var(--accent);
}

/* ===== 新闻/文章 ===== */
.news-card,
.article-card {
    padding: 24px;
}

.news-card .date,
.article-card .date {
    font-size: 0.85rem;
    opacity: 0.5;
    margin-bottom: 8px;
}

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

.news-card p,
.article-card p {
    opacity: 0.75;
    font-size: 0.95rem;
    margin-bottom: 16px;
}

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

/* ===== FAQ ===== */
.faq-item {
    padding: 20px 24px;
    margin-bottom: 16px;
    cursor: pointer;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 1.1rem;
}

.faq-question .toggle {
    font-size: 1.4rem;
    transition: var(--transition);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s;
    padding-top: 0;
    opacity: 0;
}

.faq-item.open .faq-answer {
    max-height: 400px;
    padding-top: 16px;
    opacity: 1;
}

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

/* ===== HowTo ===== */
.howto-step {
    padding: 24px;
    margin-bottom: 20px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.howto-step .step-num {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--text-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    flex-shrink: 0;
}

.howto-step .step-content h4 {
    font-size: 1.2rem;
    margin-bottom: 6px;
}

.howto-step .step-content p {
    opacity: 0.8;
}

/* ===== 联系我们 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info p {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.contact-info .label {
    font-weight: 600;
    color: var(--accent);
}

.map-placeholder {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius);
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    opacity: 0.6;
}

/* ===== 面包屑 ===== */
.breadcrumb {
    padding: 16px 0;
    font-size: 0.9rem;
    opacity: 0.7;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

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

/* ===== 页脚 ===== */
footer {
    background: rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(12px);
    padding: 60px 0 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

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

.footer-col h4 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--accent);
}

.footer-col a,
.footer-col p {
    display: block;
    margin-bottom: 8px;
    opacity: 0.75;
    font-size: 0.95rem;
}

.footer-col a:hover {
    opacity: 1;
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.85rem;
    opacity: 0.6;
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent);
    color: var(--text-dark);
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--accent2);
    color: #fff;
    transform: scale(1.1);
}

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

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

/* ===== 搜索 ===== */
.search-results {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border-radius: var(--radius);
    padding: 16px;
    width: 300px;
    max-height: 400px;
    overflow-y: auto;
    box-shadow: var(--shadow);
    border: 1px solid var(--glass-border);
    z-index: 100;
}

.search-results.active {
    display: block;
}

.search-results a {
    display: block;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    color: var(--text);
}

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

.search-wrapper {
    position: relative;
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .story-content,
    .about-content,
    .culture-content {
        grid-template-columns: 1fr;
    }
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .partner-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .banner-content h1 {
        font-size: 2.4rem;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .menu-toggle {
        display: block;
    }
    .search-box input {
        width: 100px;
    }
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .partner-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
    .banner-content h1 {
        font-size: 2rem;
    }
    section {
        padding: 50px 0;
    }
    .section-title {
        font-size: 1.8rem;
    }
}

@media (max-width: 480px) {
    .banner-content h1 {
        font-size: 1.6rem;
    }
    .banner-content p {
        font-size: 1rem;
    }
    .search-box input {
        width: 80px;
    }
}