:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-border: #bfdbfe;
    --bg: #f8fafc;
    --surface: #ffffff;
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.08), 0 4px 10px rgba(0,0,0,0.05);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-xs: 6px;
    --max-width: 1000px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}


header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background: rgba(255,255,255,0.92);
}

header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 18px;
}

.logo img {
    width: 32px;
    height: 32px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 6px 14px;
    border-radius: var(--radius-xs);
    transition: all 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
    background: var(--primary-light);
}

.gh-link {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
    margin-left: 8px;
    padding: 6px 10px;
    border-radius: var(--radius-xs);
}

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

.gh-link svg {
    width: 20px;
    height: 20px;
}


.hero {
    text-align: center;
    padding: 72px 0 56px;
    background: linear-gradient(180deg, var(--surface) 0%, var(--bg) 100%);
}

.hero-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 24px;
    border-radius: 20px;
    box-shadow: 0 8px 24px rgba(37,99,235,0.15);
}

.hero h1 {
    font-size: 44px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 12px;
    letter-spacing: -1px;
}

.hero .desc {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 28px;
    line-height: 1.8;
}

.hero .site-links {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.hero .site-links a {
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

.hero .site-links a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    font-family: inherit;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 16px rgba(37,99,235,0.35);
}

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

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


.version-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--primary-light);
    color: var(--primary);
    border: 1px solid var(--primary-border);
    border-radius: 999px;
    padding: 6px 18px;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s;
    text-decoration: none;
}

.version-badge:hover {
    background: #dbeafe;
    border-color: #93c5fd;
}

.version-badge .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #22c55e;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.version-badge.loading .dot {
    background: #f59e0b;
    animation: none;
}

.version-badge.error .dot {
    background: #ef4444;
    animation: none;
}


.section {
    padding: 64px 0;
}

.section-alt {
    background: var(--surface);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 12px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 40px;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}


.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.feature-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    text-align: center;
    transition: all 0.2s;
}

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

.feature-icon {
    font-size: 32px;
    margin-bottom: 12px;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
}

.feature-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}


.platform-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.platform-grid-3 {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.platform-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    transition: all 0.2s;
    overflow: hidden;
}

.platform-card:hover {
    box-shadow: var(--shadow-md);
}

.platform-card h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.platform-card p {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    line-height: 1.5;
}

.platform-card ul {
    list-style: none;
    padding: 0;
}

.platform-card li {
    font-size: 12px;
    color: var(--text-secondary);
    padding: 3px 0;
    padding-left: 18px;
    position: relative;
}

.platform-card li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 11px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--primary);
}


.code-block {
    background: #1e293b;
    border-radius: var(--radius-sm);
    padding: 20px 24px;
    overflow-x: auto;
    margin: 16px 0;
}

.code-block pre {
    color: #e2e8f0;
    font-family: "SF Mono", "Cascadia Code", "Consolas", "Fira Code", monospace;
    font-size: 13px;
    line-height: 1.8;
    margin: 0;
    white-space: pre;
}

.code-block .comment { color: #94a3b8; }
.code-block .cmd { color: #7dd3fc; }
.code-block .arg { color: #fde68a; }
.code-block .path { color: #a5b4fc; }
.code-block .opt { color: #c4b5fd; }


.tabs {
    display: flex;
    gap: 4px;
    background: var(--border);
    border-radius: var(--radius-sm);
    padding: 4px;
    margin-bottom: 16px;
    overflow-x: auto;
}

.tab-btn {
    padding: 8px 18px;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    color: var(--text-secondary);
    white-space: nowrap;
    transition: all 0.2s;
    font-family: inherit;
}

.tab-btn.active {
    background: var(--surface);
    color: var(--text);
    box-shadow: var(--shadow);
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}


.download-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.download-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 16px;
    text-align: center;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
}

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

.download-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 10px;
    font-size: 20px;
}

.download-icon img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.download-card h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
}

.download-card .file-name {
    font-size: 11px;
    color: var(--text-secondary);
    font-family: "SF Mono", "Cascadia Code", "Consolas", monospace;
    background: #f1f5f9;
    padding: 2px 8px;
    border-radius: 4px;
    margin-bottom: 6px;
    word-break: break-all;
}

.download-card .card-desc {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 14px;
    flex: 1;
    line-height: 1.5;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--primary);
    color: #fff;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    transition: all 0.2s;
    width: 100%;
    justify-content: center;
}

.download-btn:hover {
    background: var(--primary-hover);
    box-shadow: 0 4px 12px rgba(37,99,235,0.3);
}

.download-btn svg {
    width: 16px;
    height: 16px;
}

.backup-link {
    display: inline-block;
    margin-top: 8px;
    font-size: 12px;
    color: var(--primary);
    text-decoration: none;
    transition: color 0.2s;
}

.backup-link:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}


.usage-detail {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    margin-bottom: 24px;
}

.usage-detail h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 6px;
}

.usage-detail .detail-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    font-family: "SF Mono", "Cascadia Code", "Consolas", monospace;
    margin-bottom: 20px;
}

.usage-detail h4 {
    font-size: 15px;
    font-weight: 600;
    margin: 20px 0 10px;
    color: var(--text);
}

.usage-detail p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.usage-detail ul {
    list-style: none;
    padding: 0;
}

.usage-detail li {
    font-size: 14px;
    color: var(--text-secondary);
    padding: 3px 0;
    padding-left: 20px;
    position: relative;
}

.usage-detail li::before {
    content: "•";
    position: absolute;
    left: 4px;
    color: var(--primary);
    font-weight: bold;
}


.table-wrap {
    overflow-x: auto;
    margin: 16px 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

thead {
    background: #f1f5f9;
}

th {
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    color: var(--text);
    border: 1px solid var(--border);
    white-space: nowrap;
}

td {
    padding: 10px 14px;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

tbody tr:hover {
    background: #f8fafc;
}

td code {
    font-family: "SF Mono", "Cascadia Code", "Consolas", monospace;
    font-size: 12px;
    background: #f1f5f9;
    padding: 2px 6px;
    border-radius: 3px;
    color: var(--primary);
    white-space: nowrap;
}


.requirement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
}

.req-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 20px;
}

.req-card h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
}

.req-card p {
    font-size: 13px;
    color: var(--text-secondary);
}

.req-card .tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 500;
    padding: 2px 8px;
    border-radius: 4px;
    background: var(--primary-light);
    color: var(--primary);
    margin-right: 4px;
    margin-bottom: 4px;
}


footer {
    border-top: 1px solid var(--border);
    padding: 36px 0;
    text-align: center;
    background: var(--surface);
}

footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

footer .links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

footer .links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

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

footer .copyright {
    font-size: 13px;
    color: var(--text-muted);
}


.page-header {
    text-align: center;
    padding: 48px 0 12px;
}

.page-header h1 {
    font-size: 32px;
    font-weight: 800;
}

.page-header .section-subtitle {
    margin-bottom: 4px;
}

.page-header .version-row {
    margin-top: 16px;
}


.web-experience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
}

.web-exp-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    text-decoration: none;
    color: var(--text);
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
}

.web-exp-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
    border-color: var(--primary-border);
}

.web-exp-icon {
    font-size: 36px;
    margin-bottom: 12px;
}

.web-exp-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.web-exp-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    flex: 1;
    margin-bottom: 16px;
}

.web-exp-link {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
}

.web-exp-card:hover .web-exp-link {
    text-decoration: underline;
}


@media (max-width: 768px) {
    .hero { padding: 48px 0 36px; }
    .hero h1 { font-size: 30px; }
    .hero .desc { font-size: 15px; }
    .section-title { font-size: 22px; }
    .section { padding: 40px 0; }
    .download-grid { grid-template-columns: 1fr 1fr; }
    .platform-grid { grid-template-columns: 1fr 1fr; }
    .features { grid-template-columns: 1fr 1fr; }
    .usage-detail { padding: 20px; }

    header .container { height: auto; padding: 10px 24px; flex-wrap: wrap; justify-content: center; gap: 8px; }
}

@media (max-width: 480px) {
    .features { grid-template-columns: 1fr; }
    .platform-grid { grid-template-columns: 1fr; }
    .download-grid { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; align-items: center; }
    .btn { width: 100%; justify-content: center; }
}