@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: #1976d2;
    --primary-dark: #0d47a1;
    --accent: #ff5722;
    --bg-light: #e3f2fd;
    --bg-white: #ffffff;
    --text-dark: #0d47a1;
    --text-gray: #546e7a;
    --shadow: 0 4px 20px rgba(25, 118, 210, 0.12);
    --shadow-hover: 0 8px 30px rgba(25, 118, 210, 0.2);
    --radius: 12px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.7;
    font-weight: 400;
}

h1, h2, h3, h4, h5 {
    font-family: 'ZCOOL XiaoWei', serif;
    color: var(--primary-dark);
    line-height: 1.3;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

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

/* Header & Navigation */
.site-header {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: 'ZCOOL XiaoWei', serif;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-dark);
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 22px;
}

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

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 5px;
}

.main-nav a {
    display: block;
    padding: 10px 18px;
    color: var(--text-dark);
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
    font-size: 15px;
}

.main-nav a:hover,
.main-nav a.active {
    background: var(--bg-light);
    color: var(--primary);
}

.main-nav a.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 28px;
    color: var(--primary);
    cursor: pointer;
}

/* Browser Window Mockup */
.browser-window {
    background: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    border: 1px solid #e0e0e0;
}

.browser-bar {
    background: #f5f5f5;
    padding: 10px 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid #e0e0e0;
}

.browser-dots {
    display: flex;
    gap: 6px;
}

.browser-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.browser-dots span:nth-child(1) { background: #ff5f57; }
.browser-dots span:nth-child(2) { background: #febc2e; }
.browser-dots span:nth-child(3) { background: #28c840; }

.browser-url {
    flex: 1;
    background: white;
    border-radius: 20px;
    padding: 5px 15px;
    font-size: 13px;
    color: var(--text-gray);
    border: 1px solid #ddd;
}

.browser-content {
    padding: 40px;
    min-height: 300px;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--accent) 100%);
    color: white;
    padding: 80px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: rgba(255,255,255,0.08);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: rgba(255,255,255,0.05);
    border-radius: 50%;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 48px;
    color: white;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 18px;
    margin-bottom: 35px;
    opacity: 0.95;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 30px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 15px;
}

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

.btn-primary:hover {
    background: var(--bg-light);
    color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}

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

.btn-accent:hover {
    background: #e64a19;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.2);
}

.btn-outline {
    background: transparent;
    color: white;
    border: 2px solid white;
}

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

.btn-large {
    padding: 18px 40px;
    font-size: 17px;
}

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

.section-alt {
    background: var(--bg-white);
}

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

.section-header h2 {
    font-size: 36px;
    margin-bottom: 15px;
}

.section-header p {
    color: var(--text-gray);
    font-size: 17px;
    max-width: 600px;
    margin: 0 auto;
}

.section-title-bar {
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    margin: 15px auto 0;
    border-radius: 2px;
}

/* Feature Cards */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 25px;
}

.feature-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 35px 28px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border-top: 4px solid transparent;
    position: relative;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
    border-top-color: var(--primary);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--bg-light), var(--bg-white));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    margin-bottom: 20px;
    color: var(--primary);
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-gray);
    font-size: 14.5px;
    line-height: 1.7;
}

.feature-tag {
    display: inline-block;
    padding: 3px 10px;
    background: var(--bg-light);
    color: var(--primary);
    border-radius: 12px;
    font-size: 12px;
    margin-top: 15px;
    font-weight: 500;
}

/* Portal Cards */
.portal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.portal-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 25px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    display: block;
}

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

.portal-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 15px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 32px;
    transition: var(--transition);
}

.portal-card:hover .portal-icon {
    background: linear-gradient(135deg, var(--accent), #e64a19);
    transform: scale(1.1);
}

.portal-card h4 {
    font-size: 17px;
    margin-bottom: 6px;
}

.portal-card p {
    color: var(--text-gray);
    font-size: 13px;
}

.portal-category {
    margin-bottom: 40px;
}

.portal-category h3 {
    font-size: 22px;
    margin-bottom: 20px;
    padding-left: 15px;
    border-left: 4px solid var(--primary);
}

/* Tool Cards */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 22px;
}

.tool-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 30px 25px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    display: flex;
    gap: 18px;
    align-items: flex-start;
    border-left: 4px solid var(--primary);
}

.tool-card:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-hover);
    border-left-color: var(--accent);
}

.tool-icon {
    width: 50px;
    height: 50px;
    min-width: 50px;
    background: var(--bg-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--primary);
}

.tool-info h4 {
    font-size: 17px;
    margin-bottom: 6px;
}

.tool-info p {
    color: var(--text-gray);
    font-size: 13.5px;
}

.tool-filter {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 35px;
    flex-wrap: wrap;
}

.tool-filter button {
    padding: 8px 22px;
    background: var(--bg-white);
    border: 2px solid var(--bg-light);
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-dark);
    transition: var(--transition);
    font-family: 'Noto Sans SC', sans-serif;
}

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

/* Download Section */
.download-hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    color: white;
    padding: 70px 0;
    border-radius: var(--radius);
    margin: 40px 0;
    text-align: center;
}

.download-hero h2 {
    color: white;
    font-size: 36px;
    margin-bottom: 15px;
}

.download-hero p {
    font-size: 17px;
    margin-bottom: 30px;
    opacity: 0.95;
}

.download-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    background: white;
    color: var(--primary);
    border-radius: 30px;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 15px;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.25);
}

.download-btn .platform {
    font-size: 13px;
    color: var(--text-gray);
    display: block;
}

.system-requirements {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow);
    margin: 40px 0;
}

.system-requirements h3 {
    font-size: 24px;
    margin-bottom: 25px;
}

.req-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

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

.req-item strong {
    display: block;
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 14px;
}

.req-item span {
    color: var(--text-dark);
    font-size: 15px;
}

.install-steps {
    counter-reset: step;
    margin: 40px 0;
}

.install-step {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 30px 30px 30px 80px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    position: relative;
    counter-increment: step;
}

.install-step::before {
    content: counter(step);
    position: absolute;
    left: 25px;
    top: 50%;
    transform: translateY(-50%);
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
}

.install-step h4 {
    font-size: 19px;
    margin-bottom: 8px;
}

.install-step p {
    color: var(--text-gray);
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-image {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.about-image img {
    width: 100%;
    display: block;
}

.about-content h2 {
    font-size: 34px;
    margin-bottom: 20px;
}

.about-content p {
    color: var(--text-gray);
    margin-bottom: 15px;
    font-size: 16px;
}

.mission-section {
    background: var(--bg-white);
    padding: 60px 0;
}

.mission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.mission-card {
    text-align: center;
    padding: 40px 30px;
}

.mission-card .feature-icon {
    margin: 0 auto 20px;
}

.team-section {
    padding: 60px 0;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
}

.team-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 30px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

.team-avatar {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    margin: 0 auto 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 36px;
    font-weight: 700;
}

.team-card h4 {
    font-size: 18px;
    margin-bottom: 5px;
}

.team-role {
    color: var(--primary);
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 10px;
}

.team-card p {
    color: var(--text-gray);
    font-size: 13px;
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 40px;
}

.contact-info {
    background: var(--primary);
    color: white;
    border-radius: var(--radius);
    padding: 40px 35px;
}

.contact-info h3 {
    color: white;
    font-size: 24px;
    margin-bottom: 25px;
}

.contact-item {
    display: flex;
    gap: 15px;
    margin-bottom: 22px;
    align-items: flex-start;
}

.contact-icon {
    width: 42px;
    height: 42px;
    background: rgba(255,255,255,0.2);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.contact-item strong {
    display: block;
    margin-bottom: 4px;
    font-size: 15px;
}

.contact-item span {
    font-size: 14px;
    opacity: 0.9;
}

.contact-form {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 40px 35px;
    box-shadow: var(--shadow);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-dark);
    font-size: 14px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 15px;
    font-family: 'Noto Sans SC', sans-serif;
    transition: var(--transition);
    background: #fafafa;
}

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

.form-group textarea {
    resize: vertical;
    min-height: 130px;
}

.contact-submit {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Noto Sans SC', sans-serif;
}

.contact-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(25, 118, 210, 0.3);
}

/* Scenario Cards */
.scenario-section {
    background: var(--bg-light);
    padding: 60px 0;
}

.scenario-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 25px;
}

.scenario-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 35px 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.scenario-card:hover {
    box-shadow: var(--shadow-hover);
}

.scenario-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--primary);
}

.scenario-card p {
    color: var(--text-gray);
}

.scenario-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent);
    color: white;
    border-radius: 12px;
    font-size: 12px;
    margin-bottom: 15px;
}

/* Featured Recommendations */
.featured-section {
    padding: 60px 0;
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

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

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

.featured-image {
    height: 180px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 60px;
    color: white;
}

.featured-body {
    padding: 25px;
}

.featured-body h3 {
    font-size: 19px;
    margin-bottom: 10px;
}

.featured-body p {
    color: var(--text-gray);
    font-size: 14px;
    margin-bottom: 15px;
}

.featured-link {
    color: var(--primary);
    font-weight: 600;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.featured-link:hover {
    color: var(--accent);
}

/* CTA Section */
.cta-section {
    background: linear-gradient(135deg, var(--primary-dark), var(--accent));
    padding: 70px 0;
    border-radius: var(--radius);
    color: white;
    text-align: center;
    margin: 40px 0;
}

.cta-section h2 {
    color: white;
    font-size: 32px;
    margin-bottom: 15px;
}

.cta-section p {
    font-size: 17px;
    margin-bottom: 30px;
    opacity: 0.95;
}

/* Footer */
.site-footer {
    background: var(--primary-dark);
    color: rgba(255,255,255,0.85);
    padding: 60px 0 0;
    margin-top: 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-col h4 {
    color: white;
    font-size: 17px;
    margin-bottom: 20px;
    font-family: 'ZCOOL XiaoWei', serif;
}

.footer-col p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 15px;
}

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

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

.footer-col ul li a {
    color: rgba(255,255,255,0.8);
    font-size: 14px;
    transition: var(--transition);
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    font-family: 'ZCOOL XiaoWei', serif;
    font-size: 20px;
    color: white;
}

.social-links {
    display: flex;
    gap: 12px;
    margin-top: 15px;
}

.social-links a {
    width: 38px;
    height: 38px;
    background: rgba(255,255,255,0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 16px;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--accent);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.15);
    padding: 20px 0;
    text-align: center;
    font-size: 13px;
}

/* Page Banner (inner pages) */
.page-banner {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: white;
    padding: 60px 0;
    text-align: center;
}

.page-banner h1 {
    color: white;
    font-size: 38px;
    margin-bottom: 12px;
}

.page-banner p {
    font-size: 17px;
    opacity: 0.95;
    max-width: 600px;
    margin: 0 auto;
}

/* Responsive Design */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 38px;
    }

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

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

    .section {
        padding: 60px 0;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-white);
        box-shadow: var(--shadow);
        padding: 20px;
    }

    .main-nav.open {
        display: block;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 5px;
    }

    .main-nav a {
        padding: 12px 18px;
    }

    .hero {
        padding: 60px 0 80px;
    }

    .hero h1 {
        font-size: 30px;
    }

    .hero p {
        font-size: 16px;
    }

    .page-banner h1 {
        font-size: 28px;
    }

    .section-header h2 {
        font-size: 28px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .browser-content {
        padding: 25px 20px;
    }

    .contact-form,
    .contact-info {
        padding: 30px 25px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 26px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 260px;
    }

    .feature-grid,
    .portal-grid,
    .tool-grid,
    .scenario-grid {
        grid-template-columns: 1fr;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
}