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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --danger: #dc2626;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.7;
    color: var(--text);
    background: var(--bg);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    padding: 0.875rem 0;
    transition: box-shadow 0.3s ease;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
}

.brand-logo {
    color: var(--primary);
}

.brand-name {
    letter-spacing: -0.025em;
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color 0.2s ease;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
}

.nav-link:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.nav-link-primary {
    background: var(--primary);
    color: #ffffff;
}

.nav-link-primary:hover {
    background: var(--primary-dark);
    color: #ffffff;
}

/* Hero Section */
.hero {
    padding-top: 10rem;
    padding-bottom: 8rem;
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 6rem;
}

.hero-content {
    flex: 1;
}

.hero-title {
    font-size: 3.75rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
    color: var(--text);
}

.title-main {
    display: block;
}

.title-sub {
    display: block;
    font-size: 2.5rem;
    font-weight: 600;
    margin-top: 0.5rem;
    color: var(--primary);
}

.hero-slogan {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 580px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    border-radius: 0.625rem;
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
    letter-spacing: 0.01em;
}

.btn-icon {
    width: 20px;
    height: 20px;
}

.btn-large {
    font-size: 1rem;
    padding: 1rem 2.5rem;
}

.btn-primary {
    background: var(--primary);
    color: #ffffff;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: #ffffff;
    color: var(--text);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.hero-features {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.feature-tag {
    background: #ffffff;
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--text-muted);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-visual-content {
    width: 420px;
    height: 420px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(37, 99, 235, 0.05) 100%);
    border-radius: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-xl);
    animation: float 6s ease-in-out infinite;
}

.hero-icon {
    color: var(--primary);
    opacity: 0.8;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* 通用区块样式 */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text);
    letter-spacing: -0.025em;
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--text-muted);
}

/* 核心功能 */
.features {
    padding: 6rem 0;
    background: #ffffff;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-dark));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon-wrapper {
    width: 48px;
    height: 48px;
    background: var(--primary-light);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    transition: all 0.3s ease;
}

.feature-card:hover .feature-icon-wrapper {
    transform: scale(1.1);
    background: var(--primary);
}

.feature-icon-wrapper .feature-icon {
    color: var(--primary);
    transition: color 0.3s ease;
}

.feature-card:hover .feature-icon-wrapper .feature-icon {
    color: #ffffff;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.feature-desc {
    color: var(--text-muted);
    line-height: 1.7;
    font-size: 0.9375rem;
}

/* 下载区域 */
.download {
    padding: 6rem 0;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: #ffffff;
}

.download .section-title {
    color: #ffffff;
}

.download .section-subtitle {
    color: rgba(255, 255, 255, 0.9);
}

.download-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.info-card {
    background: rgba(255, 255, 255, 0.12);
    padding: 1.5rem;
    border-radius: 1rem;
    display: flex;
    gap: 1.25rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.info-card:hover {
    background: rgba(255, 255, 255, 0.18);
    transform: translateY(-2px);
}

.info-icon-wrapper {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.info-icon {
    color: #ffffff;
}

.info-title {
    font-size: 1.0625rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.info-text {
    font-size: 0.9375rem;
    opacity: 0.95;
    line-height: 1.6;
}

.download-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.download-link {
    flex: 1;
    min-width: 320px;
    max-width: 420px;
    background: #ffffff;
    padding: 2rem;
    border-radius: 1rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    text-decoration: none;
    color: var(--text);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    border: 2px solid transparent;
}

.download-link:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.download-link.quark {
    border-color: #ff6b6b;
}

.download-link.baidu {
    border-color: #2932e1;
}

.link-icon {
    color: var(--primary);
    flex-shrink: 0;
}

.link-content {
    flex: 1;
}

.link-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.link-desc {
    color: var(--text-muted);
    font-size: 0.9375rem;
}

.code-inline {
    background: var(--primary-light);
    padding: 0.125rem 0.5rem;
    border-radius: 0.25rem;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.875rem;
    color: var(--primary);
    font-weight: 600;
}

.link-arrow {
    color: var(--primary);
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.download-link:hover .link-arrow {
    transform: translateX(4px);
}

.download-notice {
    background: rgba(255, 255, 255, 0.15);
    padding: 1.25rem 1.5rem;
    border-radius: 0.75rem;
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.notice-icon {
    color: #ffffff;
    flex-shrink: 0;
    margin-top: 0.125rem;
}

.notice-text {
    font-size: 0.9375rem;
    opacity: 0.95;
    line-height: 1.6;
    margin: 0;
}

/* 使用教程 */
.tutorial {
    padding: 6rem 0;
    background: var(--bg);
}

.tutorial-steps {
    margin-bottom: 4rem;
}

.tutorial-step {
    display: flex;
    gap: 2rem;
    margin-bottom: 2.5rem;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.tutorial-step:hover {
    box-shadow: var(--shadow-md);
}

.step-number {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #ffffff;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 800;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
}

.step-content {
    flex: 1;
}

.step-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text);
}

.step-text {
    color: var(--text-muted);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.step-list {
    list-style: none;
    padding: 0;
}

.step-list li {
    padding: 0.5rem 0;
    color: var(--text-muted);
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.9375rem;
}

.step-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 700;
    font-size: 1.25rem;
    line-height: 1.5;
}

.step-code {
    background: #1e293b;
    border-radius: 0.625rem;
    padding: 1.25rem;
    overflow-x: auto;
    margin-top: 1.25rem;
    box-shadow: var(--shadow-sm);
}

.step-code pre {
    margin: 0;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.875rem;
    line-height: 1.7;
    color: #e5e7eb;
}

.step-code code {
    color: #d1d5db;
}

.tutorial-tips {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
}

.tips-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.tips-icon {
    color: var(--primary);
}

.tips-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    margin: 0;
}

.tips-list {
    list-style: none;
    padding: 0;
}

.tips-list li {
    padding: 0.75rem 0;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    font-size: 0.9375rem;
    line-height: 1.7;
}

.tips-list li:last-child {
    border-bottom: none;
}

/* 常见问题 */
.faq {
    padding: 6rem 0;
    background: #ffffff;
}

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

.faq-item {
    margin-bottom: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
    transition: all 0.3s ease;
    background: var(--card-bg);
}

.faq-item.active {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.faq-question {
    width: 100%;
    padding: 1.5rem;
    background: var(--card-bg);
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text);
    text-align: left;
    transition: all 0.2s ease;
}

.faq-question:hover {
    background: var(--bg);
}

.question-icon {
    color: var(--primary);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

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

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

.faq-answer p {
    padding: 0 1.5rem 1.5rem;
    color: var(--text-muted);
    line-height: 1.8;
    margin: 0;
    font-size: 0.9375rem;
}

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

/* 页脚 */
.footer {
    background: #1e293b;
    color: #ffffff;
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-text {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
    font-size: 0.9375rem;
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.2s ease;
    font-size: 0.9375rem;
}

.footer-links a:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
}

.copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }

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

    .hero-buttons {
        justify-content: center;
    }

    .hero-features {
        justify-content: center;
    }

    .hero-visual-content {
        width: 350px;
        height: 350px;
    }

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

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

    .hero-title {
        font-size: 2.5rem;
    }

    .title-sub {
        font-size: 2rem;
    }

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

    .section-title {
        font-size: 2rem;
    }

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

    .tutorial-step {
        flex-direction: column;
    }

    .step-number {
        margin: 0 auto;
    }

    .download-links {
        flex-direction: column;
    }

    .download-link {
        max-width: 100%;
        min-width: 100%;
    }

    .hero-visual {
        display: none;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero {
        padding-top: 7rem;
        padding-bottom: 5rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .title-sub {
        font-size: 1.5rem;
    }

    .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.875rem;
    }

    .feature-card,
    .tutorial-step,
    .info-card {
        padding: 1.5rem;
    }
}