/* 全局变量 */
:root {
    --color-primary: #4f46e5;
    --color-primary-dark: #4338ca;
    --color-primary-light: #818cf8;
    --color-secondary: #10b981;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-background: #ffffff;
    --color-background-alt: #f9fafb;
    --color-border: #e5e7eb;
    --color-error: #ef4444;
    --color-success: #10b981;
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 5rem;
    
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
}

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    line-height: 1.5;
    background-color: var(--color-background);
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

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

/* 容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* 按钮 */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all 0.2s ease;
    cursor: pointer;
}

.button--primary {
    background-color: var(--color-primary);
    color: white;
    border: 1px solid var(--color-primary);
}

.button--primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

.button--outline {
    background-color: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.button--outline:hover {
    background-color: rgba(79, 70, 229, 0.05);
}

.button--large {
    padding: 0.75rem 1.5rem;
    font-size: 1.125rem;
}

/* 头部 */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
}

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

.logo {
    display: flex;
    align-items: center;
}

.logo a {
    display: flex;
    align-items: center;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-primary);
}

.logo img {
    height: 2rem;
    margin-right: var(--spacing-sm);
}

.nav__list {
    display: flex;
    gap: var(--spacing-lg);
}

.nav__link {
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.header__actions {
    display: flex;
    gap: var(--spacing-md);
}

/* 英雄区域 */
.hero {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-background-alt);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero__title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.hero__description {
    font-size: 1.25rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

.hero__actions {
    display: flex;
    gap: var(--spacing-md);
}

.hero__image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* 特性部分 */
.features {
    padding: var(--spacing-3xl) 0;
}

.section__title {
    text-align: center;
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-2xl);
}

.section__description {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto var(--spacing-2xl);
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.feature__card {
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-full);
    background-color: rgba(79, 70, 229, 0.1);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.feature__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.feature__description {
    color: var(--color-text-light);
}

/* 下载部分 */
.download {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-background-alt);
}

.installation__steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.download__platform {
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.download__platform:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.platform__icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.platform__version {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

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

.download__icon {
    margin-right: var(--spacing-xs);
}

.download__note {
    margin-top: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.installation__notes {
    background-color: var(--color-background);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    border: 1px solid var(--color-border);
}

.installation__notes h3 {
    margin-bottom: var(--spacing-md);
}

.installation__notes ul {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
    list-style-type: disc;
}

.installation__notes li {
    margin-bottom: var(--spacing-xs);
}

.installation__notes a {
    color: var(--color-primary);
    text-decoration: underline;
}

.installation__notes a:hover {
    color: var(--color-primary-dark);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .installation__steps {
        grid-template-columns: 1fr;
    }

    .download__buttons .button {
        max-width: 100%;
    }

    .installation__notes {
        padding: var(--spacing-lg);
    }
}

/* 文档部分 */
.documentation {
    padding: var(--spacing-3xl) 0;
}

.documentation__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.doc__card {
    display: block;
    padding: var(--spacing-xl);
    background-color: var(--color-background);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.doc__card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    color: var(--color-text);
}

.doc__card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.doc__card p {
    color: var(--color-text-light);
    margin-bottom: 0;
}

/* CTA部分 */
.cta {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-primary);
    color: white;
}

.cta__content {
    text-align: center;
}

.cta__content h2 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.cta__content p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
}

.cta .button--primary {
    background-color: white;
    color: var(--color-primary);
    border-color: white;
}

.cta .button--primary:hover {
    background-color: rgba(255, 255, 255, 0.9);
    border-color: rgba(255, 255, 255, 0.9);
}

/* 页脚 */
.footer {
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    background-color: var(--color-background-alt);
    border-top: 1px solid var(--color-border);
}

.footer__content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.footer__section h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer__section ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer__section a {
    color: var(--color-text-light);
    transition: color 0.2s ease;
}

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

.social__links {
    display: flex;
    gap: var(--spacing-md);
}

.social__link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-full);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    color: var(--color-text-light);
    transition: all 0.2s ease;
}

.social__link:hover {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: white;
}

.footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.footer__links {
    display: flex;
    gap: var(--spacing-lg);
}

/* 响应式调整 */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
    }

    .hero__image {
        order: -1;
    }

    .hero__title {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    .header__content {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav__list {
        flex-wrap: wrap;
        justify-content: center;
    }

    .footer__content {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer__bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero__title {
        font-size: 2rem;
    }

    .hero__actions {
        flex-direction: column;
    }

    .section__title {
        font-size: 1.75rem;
    }

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