/* 全局重置与基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s, box-shadow 0.3s, transform 0.3s, opacity 0.3s;
}

:root {
    --primary: #1E3A5F;
    --primary-light: #2A5080;
    --accent: #FFD700;
    --accent-light: #FFE44D;
    --bg: #F8FAFC;
    --card-bg: #ffffff;
    --text: #1E293B;
    --text-light: #64748B;
    --border: #E2E8F0;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    --glass: rgba(255, 255, 255, 0.7);
    --radius: 20px;
    --radius-sm: 12px;
    --max-w: 1200px;
    --header-h: 70px;
}

.dark {
    --bg: #0F172A;
    --card-bg: #1E293B;
    --text: #E2E8F0;
    --text-light: #94A3B8;
    --border: #334155;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --glass: rgba(30, 41, 59, 0.8);
}

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

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

a {
    color: var(--primary-light);
    text-decoration: none;
}

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

/* 容器 */
.container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    height: var(--header-h);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: var(--max-w);
    margin: 0 auto;
    padding: 0 24px;
}

.logo {
    font-size: 1.6rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

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

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

nav a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
    position: relative;
    padding: 4px 0;
}

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

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

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

.dark-toggle {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text);
    box-shadow: var(--shadow);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text);
}

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    background: linear-gradient(135deg, var(--primary) 0%, #0F2A44 50%, var(--primary-light) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-content {
    text-align: center;
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 900;
    color: #ffffff;
    line-height: 1.2;
    margin-bottom: 20px;
    text-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.hero h1 span {
    background: linear-gradient(135deg, var(--accent), #FFA500);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 36px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: all 0.3s;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #FFA500);
    color: var(--primary);
    box-shadow: 0 8px 30px rgba(255, 215, 0, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(255, 215, 0, 0.4);
}

.btn-outline {
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.6);
    color: #fff;
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent);
    color: var(--accent);
}

.hero-stats {
    display: flex;
    gap: 40px;
    justify-content: center;
    margin-top: 60px;
    flex-wrap: wrap;
}

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

.hero-stat .num {
    font-size: 2.8rem;
    font-weight: 900;
    color: var(--accent);
    display: block;
}

.hero-stat .label {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    margin-top: 4px;
}

/* Section */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
}

.section-title h2 {
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 12px;
}

.section-title h2 span {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-title p {
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
    font-size: 1.1rem;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 32px 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    backdrop-filter: blur(4px);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.12);
}

.card-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    font-size: 1.8rem;
}

.card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text);
}

.card p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* About */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-content h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 20px;
}

.about-content h2 span {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.about-content p {
    color: var(--text-light);
    margin-bottom: 16px;
    font-size: 1.05rem;
}

.about-image {
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
    border-radius: var(--radius);
    padding: 40px;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.about-image svg {
    width: 100%;
    height: auto;
    max-width: 400px;
}

/* Timeline */
.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), var(--primary-light));
}

.timeline-item {
    position: relative;
    margin-bottom: 36px;
    padding-left: 20px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -28px;
    top: 6px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    border: 3px solid var(--card-bg);
    box-shadow: 0 0 0 2px var(--accent);
}

.timeline-item .year {
    font-weight: 800;
    color: var(--accent);
    font-size: 1.1rem;
}

.timeline-item h4 {
    font-size: 1.15rem;
    margin: 4px 0 6px;
    color: var(--text);
}

.timeline-item p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Products */
.product-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 28px;
}

.product-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    text-align: center;
}

.product-card .icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 16px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
}

.product-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.product-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.product-card .price {
    font-size: 1.6rem;
    font-weight: 900;
    color: var(--primary);
}

.product-card .price small {
    font-size: 0.8rem;
    font-weight: 400;
    color: var(--text-light);
}

/* Testimonials */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
}

.testimonial-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    position: relative;
}

.testimonial-card::before {
    content: '"';
    font-size: 4rem;
    position: absolute;
    top: 10px;
    right: 20px;
    color: var(--accent);
    opacity: 0.2;
    font-family: Georgia, serif;
}

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

.testimonial-card .author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.testimonial-card .author-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: #fff;
    font-size: 1.2rem;
}

.testimonial-card .author-info strong {
    display: block;
    font-size: 0.95rem;
}

.testimonial-card .author-info span {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* FAQ */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    margin-bottom: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 24px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    background: var(--card-bg);
    color: var(--text);
    border: none;
    width: 100%;
    text-align: left;
}

.faq-question .icon {
    font-size: 1.4rem;
    transition: transform 0.3s;
    color: var(--accent);
}

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

.faq-answer {
    padding: 0 24px 18px;
    color: var(--text-light);
    font-size: 0.95rem;
    display: none;
    line-height: 1.7;
}

.faq-item.active .faq-answer {
    display: block;
}

/* HowTo */
.howto-steps {
    max-width: 800px;
    margin: 0 auto;
    counter-reset: step;
}

.howto-step {
    display: flex;
    gap: 20px;
    margin-bottom: 28px;
    align-items: flex-start;
}

.howto-step .step-num {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #FFA500);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.2rem;
    counter-increment: step;
}

.howto-step .step-content h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.howto-step .step-content p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* News */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
}

.news-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.news-card .image {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.news-card .body {
    padding: 20px 24px 24px;
}

.news-card .date {
    font-size: 0.8rem;
    color: var(--text-light);
    margin-bottom: 6px;
}

.news-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.news-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.news-card .read-more {
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

/* Contact */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.contact-info h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.contact-info p {
    color: var(--text-light);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.contact-info .icon {
    width: 24px;
    text-align: center;
    color: var(--accent);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--card-bg);
    color: var(--text);
    font-size: 1rem;
    margin-bottom: 16px;
    transition: border-color 0.3s;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
footer {
    background: var(--primary);
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 8px;
    font-size: 0.9rem;
}

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

.footer-col p {
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 0.85rem;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.6);
}

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

/* Back to top */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #FFA500);
    color: var(--primary);
    border: none;
    cursor: pointer;
    font-size: 1.4rem;
    box-shadow: 0 8px 24px rgba(255, 215, 0, 0.3);
    z-index: 999;
    display: none;
    align-items: center;
    justify-content: center;
}

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

/* Search overlay */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
}

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

.search-box {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 40px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.3);
}

.search-box input {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1.1rem;
    background: var(--bg);
    color: var(--text);
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent);
}

.search-box .results {
    margin-top: 20px;
    max-height: 300px;
    overflow-y: auto;
}

.search-box .results a {
    display: block;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

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

/* Scroll anim */
.scroll-anim {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scroll-anim.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
    }

    .hero p {
        font-size: 1rem;
    }

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

    nav {
        display: none;
        position: fixed;
        top: var(--header-h);
        left: 0;
        right: 0;
        background: var(--card-bg);
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: var(--shadow);
        border-bottom: 1px solid var(--border);
    }

    nav.open {
        display: flex;
    }

    .mobile-menu-btn {
        display: block;
    }

    .section-title h2 {
        font-size: 1.8rem;
    }

    .hero-stats {
        gap: 24px;
    }

    .hero-stat .num {
        font-size: 2rem;
    }

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

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }

    .card-grid,
    .product-showcase,
    .testimonial-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }

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