@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&family=ZCOOL+XiaoWei&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #00838f;
    --secondary: #455a64;
    --bg-light: #e0f2f1;
    --text-dark: #263238;
    --white: #ffffff;
    --accent: #26c6da;
    --shadow: 0 4px 20px rgba(0, 131, 143, 0.15);
    --shadow-hover: 0 8px 30px rgba(0, 131, 143, 0.25);
    --radius: 12px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    color: var(--text-dark);
    background: var(--bg-light);
    line-height: 1.7;
    min-height: 100vh;
}

h1, h2, h3, h4 {
    font-family: 'ZCOOL XiaoWei', 'Noto Sans SC', serif;
    color: var(--text-dark);
    line-height: 1.3;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

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

header {
    background: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    font-family: 'ZCOOL XiaoWei', serif;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo span {
    background: var(--primary);
    color: var(--white);
    padding: 2px 10px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 400;
}

nav ul {
    display: flex;
    gap: 8px;
}

nav ul li a {
    padding: 8px 18px;
    border-radius: 8px;
    font-weight: 500;
    color: var(--text-dark);
    font-size: 0.95rem;
}

nav ul li a:hover,
nav ul li a.active {
    background: var(--primary);
    color: var(--white);
}

nav ul li a.active {
    background: var(--primary);
    color: var(--white);
}

.nav-toggle {
    display: none;
    font-size: 1.5rem;
    color: var(--primary);
    cursor: pointer;
    background: none;
    border: none;
}

.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    padding: 80px 0 100px;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    color: var(--white);
    margin-bottom: 20px;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    opacity: 0.95;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 12px 30px;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.3);
    margin-bottom: 20px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 30px;
}

.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--white);
    color: var(--primary);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

.btn-secondary:hover {
    background: var(--white);
    color: var(--primary);
    transform: translateY(-3px);
}

.btn-outline {
    background: var(--white);
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-lg {
    padding: 18px 48px;
    font-size: 1.1rem;
}

.features-bar {
    background: var(--white);
    padding: 40px 0;
    margin-top: -40px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    position: relative;
    z-index: 10;
}

.features-bar .container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 20px;
}

.feature-item .icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.feature-item h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--primary);
}

.feature-item p {
    color: var(--secondary);
    font-size: 0.9rem;
}

section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.2rem;
    color: var(--text-dark);
    margin-bottom: 12px;
}

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

.section-title .tag {
    display: inline-block;
    background: var(--primary);
    color: var(--white);
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 24px;
}

.card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
}

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

.card-img {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/9;
    background: var(--bg-light);
}

.card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.card:hover .card-img img {
    transform: scale(1.05);
}

.card-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    background: var(--primary);
    color: var(--white);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.card-score {
    position: absolute;
    top: 12px;
    right: 12px;
    background: rgba(0, 0, 0, 0.7);
    color: #ffd54f;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 700;
}

.card-body {
    padding: 16px;
}

.card-body h3 {
    font-size: 1.05rem;
    margin-bottom: 8px;
    color: var(--text-dark);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.card-meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    font-size: 0.85rem;
    color: var(--secondary);
}

.card-meta span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.filters {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.filter-btn {
    padding: 8px 24px;
    border: 2px solid var(--primary);
    background: transparent;
    color: var(--primary);
    border-radius: 50px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary);
    color: var(--white);
}

.category-section {
    background: var(--white);
    padding: 80px 0;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.category-card {
    background: linear-gradient(135deg, var(--bg-light) 0%, var(--white) 100%);
    border: 2px solid transparent;
    border-radius: var(--radius);
    padding: 30px 20px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.category-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.category-card .icon {
    font-size: 2.8rem;
    margin-bottom: 12px;
}

.category-card h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: var(--primary);
}

.category-card p {
    color: var(--secondary);
    font-size: 0.9rem;
}

.cta-section {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--white);
    padding: 80px 0;
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    color: var(--white);
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.95;
}

.feature-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.feature-detail:last-child {
    margin-bottom: 0;
}

.feature-detail.reverse {
    direction: rtl;
}

.feature-detail.reverse > * {
    direction: ltr;
}

.feature-detail-text h2 {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 20px;
}

.feature-detail-text p {
    font-size: 1.05rem;
    color: var(--secondary);
    margin-bottom: 16px;
    line-height: 1.8;
}

.feature-detail-text ul {
    margin: 20px 0;
}

.feature-detail-text ul li {
    padding: 8px 0;
    color: var(--text-dark);
    font-size: 1rem;
}

.feature-detail-text ul li::before {
    content: "✓";
    color: var(--primary);
    font-weight: 700;
    margin-right: 10px;
}

.feature-detail-image {
    background: var(--bg-light);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    aspect-ratio: 16/9;
}

.feature-detail-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.download-section {
    text-align: center;
    padding: 60px 0;
}

.download-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.download-card h3 {
    color: var(--primary);
    margin-bottom: 16px;
    font-size: 1.4rem;
}

.system-requirements {
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
}

.system-requirements h3 {
    color: var(--primary);
    margin-bottom: 20px;
    font-size: 1.4rem;
}

.req-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.req-item {
    background: var(--bg-light);
    padding: 20px;
    border-radius: 10px;
}

.req-item h4 {
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 1rem;
}

.req-item p {
    color: var(--secondary);
    font-size: 0.95rem;
}

.steps-list {
    counter-reset: steps;
    list-style: none;
    padding: 0;
}

.steps-list li {
    counter-increment: steps;
    position: relative;
    padding: 20px 20px 20px 70px;
    margin-bottom: 20px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.steps-list li::before {
    content: counter(steps);
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
}

.steps-list li h4 {
    color: var(--primary);
    margin-bottom: 6px;
}

.steps-list li p {
    color: var(--secondary);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.team-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
}

.team-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.team-card img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin: 30px auto 16px;
    object-fit: cover;
    border: 4px solid var(--bg-light);
}

.team-card h3 {
    color: var(--primary);
    margin-bottom: 6px;
}

.team-card .role {
    color: var(--secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.team-card p {
    padding: 0 20px 30px;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.contact-form {
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
    max-width: 700px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--bg-light);
    border-radius: 10px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    margin-bottom: 50px;
}

.info-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-5px);
}

.info-card .icon {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

.info-card h3 {
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.info-card p {
    color: var(--secondary);
    font-size: 0.95rem;
}

.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.legal-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 30px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}

.legal-card h3 {
    color: var(--primary);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--bg-light);
}

.legal-card p {
    color: var(--secondary);
    margin-bottom: 12px;
    line-height: 1.8;
}

footer {
    background: var(--text-dark);
    color: var(--white);
    padding: 60px 0 0;
}

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

.footer-col h4 {
    color: var(--white);
    font-size: 1.1rem;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 10px;
}

.footer-col h4::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--primary);
    border-radius: 2px;
}

.footer-col p {
    opacity: 0.85;
    margin-bottom: 16px;
    line-height: 1.8;
}

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

.footer-col ul li a {
    opacity: 0.85;
    font-size: 0.95rem;
}

.footer-col ul li a:hover {
    opacity: 1;
    color: var(--accent);
    padding-left: 5px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px 0;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.7;
}

.breadcrumb {
    background: var(--white);
    padding: 16px 0;
    border-bottom: 1px solid var(--bg-light);
}

.breadcrumb ul {
    display: flex;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--secondary);
}

.breadcrumb ul li a {
    color: var(--primary);
}

.breadcrumb ul li a:hover {
    text-decoration: underline;
}

.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
}

.pagination a,
.pagination span {
    padding: 8px 16px;
    border-radius: 8px;
    background: var(--white);
    box-shadow: var(--shadow);
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
}

.pagination a:hover,
.pagination .active {
    background: var(--primary);
    color: var(--white);
}

.banner-ad {
    background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
    color: var(--white);
    padding: 60px 0;
    text-align: center;
    border-radius: var(--radius);
    margin: 40px 0;
}

.banner-ad h2 {
    color: var(--white);
    font-size: 2rem;
    margin-bottom: 12px;
}

.banner-ad p {
    font-size: 1.1rem;
    opacity: 0.95;
}

@media (max-width: 900px) {
    .hero h1 {
        font-size: 2.2rem;
    }

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

    .features-bar .container {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .feature-detail,
    .feature-detail.reverse {
        grid-template-columns: 1fr;
        gap: 30px;
        direction: ltr;
    }

    .two-col {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }

    nav ul {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        box-shadow: var(--shadow);
    }

    nav ul.open {
        display: flex;
    }

    nav ul li {
        width: 100%;
    }

    nav ul li a {
        display: block;
        padding: 12px 18px;
    }

    .nav-toggle {
        display: block;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

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

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

@media (max-width: 600px) {
    .hero {
        padding: 50px 0 70px;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .features-bar .container {
        grid-template-columns: 1fr;
    }

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

    section {
        padding: 50px 0;
    }

    .container {
        padding: 0 16px;
    }

    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 16px;
    }

    .card-body h3 {
        font-size: 0.95rem;
    }
}