/* OpenClaw Installer - 官网样式 */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-card: #21262d;
    --border: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --accent-hover: #79b8ff;
    --accent-muted: #388bfd;
    --success: #3fb950;
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
    --radius: 12px;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(13, 17, 23, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 1.125rem;
    color: var(--text-primary);
}

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

.logo-icon {
    font-size: 1.5rem;
    color: var(--accent);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
}

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

/* Language selector */
.lang-wrap {
    margin-left: 0.5rem;
}

.lang-select {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    padding: 0.35rem 0.6rem;
    font-size: 0.875rem;
    font-family: inherit;
    cursor: pointer;
}

.lang-select:hover,
.lang-select:focus {
    border-color: var(--accent);
    outline: none;
}

/* RTL support for Arabic */
[dir="rtl"] .openclaw-features,
[dir="rtl"] .req-card ul {
    padding-left: 0;
    padding-right: 1.5rem;
}

[dir="rtl"] .steps-list li {
    padding-left: 0;
    padding-right: 3rem;
}

[dir="rtl"] .steps-list li::before {
    left: auto;
    right: 0;
}

/* Hero */
.hero {
    padding: 4rem 2rem 5rem;
    text-align: center;
}

.hero-content {
    max-width: 720px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.hero-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--radius);
    transition: all 0.2s;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border: none;
}

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

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

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

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* Sections */
section {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

section h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 2rem;
    text-align: center;
}

/* Features */
.features {
    padding-top: 2rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* Platforms */
.platform-list {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.platform-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    font-weight: 500;
}

.platform-icon {
    font-size: 2rem;
}

/* Requirements */
.req-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.req-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.req-card h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.req-card ul {
    list-style: none;
    color: var(--text-secondary);
}

.req-card li {
    padding: 0.25rem 0;
    padding-left: 1.25rem;
    position: relative;
}

.req-card li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent);
}

/* About OpenClaw */
.about-openclaw {
    background: var(--bg-secondary);
    border-radius: var(--radius);
}

.openclaw-features {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.openclaw-features li {
    margin: 0.5rem 0;
}

/* CTA */
.cta {
    text-align: center;
    padding: 4rem 2rem;
}

.cta h2 {
    margin-bottom: 0.5rem;
}

.cta p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--border);
    padding: 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-content p {
    margin: 0.25rem 0;
}

/* Download Page */
.page-header {
    text-align: center;
    padding: 3rem 2rem 2rem;
}

.page-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--text-secondary);
}

.download-section {
    padding-top: 1rem;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.download-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.download-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.download-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.download-card h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.download-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.download-card .btn {
    margin-bottom: 1rem;
}

.download-note {
    font-size: 0.8125rem;
}

.download-note code {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background: var(--bg-secondary);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
}

/* Command Install */
.command-install {
    padding-top: 1rem;
}

.command-install p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    text-align: center;
}

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

.command-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
}

.command-card h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.command-card .code-block {
    font-size: 0.8125rem;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Install Steps */
.install-steps {
    background: var(--bg-secondary);
    border-radius: var(--radius);
}

.steps-list {
    list-style: none;
    counter-reset: step;
}

.steps-list li {
    counter-increment: step;
    padding: 1.5rem 0;
    padding-left: 3rem;
    position: relative;
    border-bottom: 1px solid var(--border);
}

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

.steps-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    width: 2rem;
    height: 2rem;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.steps-list li strong {
    display: block;
    margin-bottom: 0.5rem;
}

.steps-list li p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin: 0.25rem 0;
}

.steps-list code {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    background: var(--bg-primary);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
}

/* Code Block */
.build-from-source pre {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    overflow-x: auto;
}

.code-block {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
}

.code-block code {
    color: var(--text-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

    .hero {
        padding: 3rem 1rem 4rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
    }

    section {
        padding: 2rem 1rem;
    }
}