/* ===== 全局样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-dark: #0A0E1A;
    --bg-light: #121824;
    --text-primary: #FFFFFF;
    --text-secondary: #A8B2D1;
    --accent: #C9A961;
    --accent-blue: #5B8DEE;
    --border: #1E2738;
    --card-bg: #151B2D;
    --gold-gradient: linear-gradient(135deg, #C9A961 0%, #E8D5A3 100%);
    --blue-gradient: linear-gradient(135deg, #5B8DEE 0%, #4A7FD9 100%);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    padding: 20px 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.btn-nav {
    background: var(--gold-gradient);
    color: var(--bg-dark);
    padding: 10px 24px;
    border-radius: 24px;
    font-weight: 600;
}

.btn-nav:hover {
    box-shadow: 0 4px 16px rgba(201, 169, 97, 0.4);
    color: var(--bg-dark);
}

.lang-selector {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    cursor: pointer;
    transition: border-color 0.3s;
}

.lang-selector:hover {
    border-color: var(--text-secondary);
}

.lang-selector option {
    background: var(--bg-dark);
    color: var(--text-primary);
}

/* ===== Hero 区域 ===== */
.hero {
    padding: 160px 0 120px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.hero-title {
    font-size: 64px;
    font-weight: 600;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -2px;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-cta {
    margin-bottom: 60px;
}

.btn-primary {
    background: var(--gold-gradient);
    color: var(--bg-dark);
    padding: 16px 40px;
    border-radius: 30px;
    text-decoration: none;
    display: inline-block;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(201, 169, 97, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(201, 169, 97, 0.5);
}

.btn-large {
    padding: 18px 48px;
    font-size: 18px;
}

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-frame {
    width: 300px;
    height: 600px;
    background: linear-gradient(135deg, #1E2738 0%, #151B2D 100%);
    border-radius: 40px;
    border: 3px solid var(--accent);
    padding: 12px;
    box-shadow: 0 20px 60px rgba(201, 169, 97, 0.3);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 30%, rgba(201, 169, 97, 0.15) 0%, transparent 60%);
    border-radius: 32px;
}

/* ===== 功能区域 ===== */
.features {
    padding: 120px 0;
    background: var(--bg-light);
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-header h2 {
    font-size: 48px;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: -1px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
}

.feature-showcase {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 48px;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--accent);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(201, 169, 97, 0.2);
}

.feature-icon {
    color: var(--accent);
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 16px;
}

/* ===== 科学区域 ===== */
.science {
    padding: 120px 0;
    background: var(--bg-dark);
}

.science-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.science-text h2 {
    font-size: 48px;
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.science-text > p {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
}

.science-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.science-list li {
    display: flex;
    gap: 16px;
}

.check {
    color: var(--accent);
    font-size: 20px;
    flex-shrink: 0;
}

.science-list strong {
    display: block;
    font-size: 18px;
    margin-bottom: 4px;
}

.science-list p {
    color: var(--text-secondary);
    font-size: 15px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.stat-box {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 32px;
    text-align: center;
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 8px;
    background: var(--gold-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-text {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.5;
}

/* ===== 用户评价 ===== */
.testimonials {
    padding: 120px 0;
    background: var(--bg-light);
}

.section-title {
    font-size: 48px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 80px;
    letter-spacing: -1px;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.testimonial {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 40px;
}

.testimonial-rating {
    color: var(--accent);
    font-size: 20px;
    margin-bottom: 20px;
}

.testimonial-text {
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.testimonial-author {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.testimonial-author strong {
    color: var(--text-primary);
    font-size: 16px;
}

.testimonial-author span {
    color: var(--text-secondary);
    font-size: 14px;
}

/* ===== 定价 ===== */
.pricing {
    padding: 120px 0;
    background: var(--bg-dark);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.pricing-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 40px;
    position: relative;
    transition: all 0.3s;
}

.pricing-card:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 24px rgba(201, 169, 97, 0.15);
}

.pricing-card.featured {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent), 0 8px 32px rgba(201, 169, 97, 0.25);
}

.badge {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gold-gradient);
    color: var(--bg-dark);
    padding: 6px 20px;
    border-radius: 16px;
    font-size: 13px;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 32px;
}

.pricing-header h3 {
    font-size: 24px;
    margin-bottom: 24px;
}

.price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.currency {
    font-size: 24px;
    color: var(--text-secondary);
}

.amount {
    font-size: 56px;
    font-weight: 700;
}

.period {
    font-size: 16px;
    color: var(--text-secondary);
}

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
}

.pricing-features li {
    padding: 12px 0;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.pricing-features .icon {
    color: var(--accent);
    font-weight: 700;
}

.pricing-features li.disabled {
    color: var(--text-secondary);
    opacity: 0.5;
}

.btn-pricing {
    display: block;
    width: 100%;
    text-align: center;
    padding: 14px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: 24px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-pricing:hover {
    border-color: var(--accent);
    background: rgba(201, 169, 97, 0.1);
}

.btn-pricing.btn-primary {
    background: var(--gold-gradient);
    color: var(--bg-dark);
    border: none;
}

.btn-pricing.btn-primary:hover {
    box-shadow: 0 8px 24px rgba(201, 169, 97, 0.3);
}

/* ===== CTA ===== */
.cta {
    padding: 120px 0;
    background: var(--bg-light);
}

.cta-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 56px;
    font-weight: 600;
    margin-bottom: 24px;
    letter-spacing: -1.5px;
}

.cta-content p {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.cta-note {
    display: flex;
    gap: 32px;
    justify-content: center;
    margin-top: 32px;
    color: var(--text-secondary);
    font-size: 14px;
}

/* ===== 页脚 ===== */
.footer {
    padding: 80px 0 40px;
    background: var(--bg-dark);
    border-top: 1px solid var(--border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand .logo {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    display: block;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 15px;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    margin-bottom: 12px;
    transition: color 0.3s;
}

.footer-column a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 14px;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 60px;
    }

    .hero-visual {
        order: -1;
    }

    .feature-showcase {
        grid-template-columns: 1fr;
    }

    .science-content {
        grid-template-columns: 1fr;
        gap: 60px;
    }

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

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

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero-title {
        font-size: 40px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .section-header h2,
    .section-title {
        font-size: 36px;
    }

    .science-text h2 {
        font-size: 36px;
    }

    .cta-content h2 {
        font-size: 36px;
    }

    .cta-note {
        flex-direction: column;
        gap: 12px;
    }

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

/* ===== 滚动动画 ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.8s ease-out;
}