/* 基础样式 - 浅色主题 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #1a1a1a;
    --primary-light: #404040;
    --primary-dark: #000000;
    --accent: #d4a853;
    --accent-light: #e8c77b;
    --dark: #1a1a1a;
    --gray-900: #111827;
    --gray-800: #1f2937;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50: #faf9f7;
    --white: #ffffff;
    --cream: #f5f3ef;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--white);
    color: var(--gray-900);
    line-height: 1.6;
}

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

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
}

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

.btn-lg {
    padding: 14px 28px;
    font-size: 15px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: #ffffff !important;
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid #e5e7eb;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: #111827;
    flex-shrink: 0;
}

.logo-img {
    width: 24px;
    height: 24px;
    border-radius: 6px;
}

.logo-icon {
    width: 24px;
    height: 24px;
    background: var(--primary);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 12px;
    color: white;
}

.logo-text {
    font-weight: 600;
    font-size: 15px;
}

.nav-links {
    display: flex;
    gap: 32px;
    flex: 1;
    justify-content: center;
}

.nav-links a {
    color: #4b5563;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: #111827;
}

.nav-actions {
    display: flex;
    gap: 12px;
    flex-shrink: 0;
}

.mobile-menu-btn {
    display: none;
}

/* 英雄区域 */
.hero {
    padding: 140px 0 80px;
    background: var(--gray-50);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--gray-900);
}

.hero-desc {
    font-size: 16px;
    color: var(--gray-600);
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 12px;
}

/* 视频/图片区域 */
.hero-media {
    position: relative;
}

.hero-video {
    width: 100%;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.browser-mockup {
    background: var(--gray-900);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.browser-header {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background: var(--gray-800);
}

.browser-dots {
    display: flex;
    gap: 8px;
}

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

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

.browser-content {
    padding: 0;
}

.browser-content img,
.browser-content video {
    width: 100%;
    display: block;
}


/* 功能区域 */
.features {
    padding: 100px 0;
    background: var(--white);
}

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

.section-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(212, 168, 83, 0.15);
    color: var(--accent);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 16px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--gray-900);
}

.section-desc {
    font-size: 16px;
    color: var(--gray-500);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s;
    position: relative;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 16px;
    padding: 2px;
    background: linear-gradient(135deg, transparent, transparent);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s;
}

.feature-card:hover {
    border-color: transparent;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
    transform: translateY(-8px);
}

.feature-card:hover::before {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    opacity: 1;
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(212, 168, 83, 0.15);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--accent);
}

.feature-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--gray-900);
}

.feature-desc {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
}

/* 下载区域 */
.download {
    padding: 100px 0;
    background: var(--gray-50);
}

.download-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.download-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 16px;
    padding: 40px 32px;
    text-align: center;
    transition: all 0.3s;
}

.download-card:hover {
    border-color: var(--accent);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
}

.download-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 24px;
}

.download-icon svg {
    width: 100%;
    height: 100%;
    fill: var(--gray-600);
}

.download-card h3 {
    font-size: 20px;
    margin-bottom: 8px;
    color: var(--gray-900);
}

.download-card p {
    color: var(--gray-500);
    margin-bottom: 24px;
    font-size: 14px;
}

.download-btns {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* 价格区域 */
.pricing {
    padding: 100px 0;
    background: var(--white);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.pricing-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 16px;
    padding: 40px 32px;
    position: relative;
}

.pricing-card.featured {
    border-color: var(--accent);
    box-shadow: 0 10px 40px rgba(212, 168, 83, 0.2);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: white;
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    margin-bottom: 32px;
}

.pricing-header h3 {
    font-size: 18px;
    margin-bottom: 16px;
    color: var(--gray-900);
}

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

.price-value {
    font-size: 42px;
    font-weight: 700;
    color: var(--gray-900);
}

.price-period {
    color: var(--gray-500);
}

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

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-100);
    font-size: 14px;
    color: var(--gray-600);
}

.pricing-features svg {
    width: 20px;
    height: 20px;
    stroke: #10b981;
    fill: none;
    stroke-width: 2;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* FAQ 常见问题 */
.faq {
    padding: 100px 0;
    background: var(--gray-50);
}

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

.faq-item {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    background: none;
    border: none;
    color: var(--gray-900);
    font-size: 15px;
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s;
}

.faq-question:hover {
    color: var(--primary);
}

.faq-icon {
    width: 20px;
    height: 20px;
    stroke: var(--accent);
    flex-shrink: 0;
    transition: transform 0.3s;
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 24px 20px;
    color: var(--gray-600);
    line-height: 1.8;
    font-size: 14px;
}


/* 页脚 */
.footer {
    padding: 60px 0 40px;
    background: var(--white);
    border-top: 1px solid var(--gray-200);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand p {
    color: var(--gray-500);
    margin-top: 16px;
    font-size: 14px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--gray-900);
}

.footer-logo .logo-img {
    width: 24px;
    height: 24px;
}

.footer-links h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--gray-900);
}

.footer-links a {
    display: block;
    color: var(--gray-500);
    text-decoration: none;
    font-size: 14px;
    margin-bottom: 12px;
    transition: color 0.2s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid var(--gray-200);
    color: var(--gray-500);
    font-size: 14px;
}

/* 响应式 */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content h1 {
        font-size: 36px;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-media {
        max-width: 600px;
        margin: 0 auto;
    }
    
    .features-grid,
    .download-cards,
    .pricing-cards {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-links,
    .nav-actions {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
        flex-direction: column;
        gap: 5px;
        background: none;
        border: none;
        cursor: pointer;
        padding: 8px;
    }
    
    .mobile-menu-btn span {
        width: 24px;
        height: 2px;
        background: var(--gray-600);
    }
    
    .hero-content h1 {
        font-size: 28px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .features-grid,
    .download-cards,
    .pricing-cards {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}


/* 两列下载卡片 */
.download-cards.two-cols {
    grid-template-columns: repeat(2, 1fr);
    max-width: 800px;
    margin: 0 auto;
}

/* CTA 区域 */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, #1a1a1a 0%, #333333 100%);
    text-align: center;
    color: white;
}

.cta h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 8px;
}

.cta .cta-sub {
    font-size: 14px;
    opacity: 0.7;
    margin-bottom: 32px;
}

.cta-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
}

.btn-white {
    background: white;
    color: #1a1a1a;
    border: 1px solid white;
}

.btn-white:hover {
    background: rgba(255, 255, 255, 0.9);
}

.btn-outline-white {
    background: transparent;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.5);
}

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

/* 响应式两列 */
@media (max-width: 768px) {
    .download-cards.two-cols {
        grid-template-columns: 1fr;
    }
    
    .cta h2 {
        font-size: 28px;
    }
    
    .cta-actions {
        flex-direction: column;
        align-items: center;
    }
}


/* 使用方法区域 */
.how-it-works {
    padding: 100px 0;
    background: var(--white);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    max-width: 900px;
    margin: 0 auto;
}

.step-card {
    text-align: center;
    padding: 32px 24px;
}

.step-number {
    width: 56px;
    height: 56px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    margin: 0 auto 20px;
}

.step-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--gray-900);
}

.step-card p {
    font-size: 14px;
    color: var(--gray-500);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .steps-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}