:root {
    --primary-color: #6366f1;
    --primary-gradient: linear-gradient(135deg, #a855f7 0%, #6366f1 100%);
    --background-color: #f8fafc;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(255, 255, 255, 0.6);
    --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.04);
    --img-placeholder-bg: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
    --radius-lg: 24px;
    --radius-md: 16px;
    --radius-sm: 12px;
    --transition-fast: 0.2s ease;

    --win-color: #0078d4;
    --mac-color: #000000;
    --and-color: #3ddc84;
    --ios-color: #af52de;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-main);
    line-height: 1.7;
    padding-top: 70px;
    background-image: radial-gradient(circle at 80% 20%, rgba(168, 85, 247, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 10% 70%, rgba(99, 102, 241, 0.05) 0%, transparent 40%);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: #4f46e5;
}

/* 导航栏 - 与首页完全一致 */
.navbar-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
}

.navbar {
    max-width: 1200px;
    height: 100%;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-logo img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.nav-logo span {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.75rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-main);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 0;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition-fast), color var(--transition-fast);
}

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

.nav-github-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #1e293b;
    color: #fff !important;
    padding: 0.4rem 1rem !important;
    border-radius: 50px !important;
    border-bottom: none !important;
    font-size: 0.85rem !important;
    font-weight: 600 !important;
    transition: background 0.25s ease, transform 0.2s ease !important;
}

.nav-github-link:hover {
    background: #0f172a !important;
    color: #fff !important;
    transform: translateY(-1px);
    border-bottom: none !important;
}

/* 主布局 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 2rem;
}

@media (max-width: 968px) {
    .container {
        grid-template-columns: 1fr;
    }
    .sidebar {
        display: none;
    }
}

/* 下载卡片网格 */
.download-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

@media (max-width: 640px) {
    .download-grid {
        grid-template-columns: 1fr;
    }
}

.download-card {
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.download-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px 0 rgba(31, 38, 135, 0.08);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1rem;
}

.card-header svg {
    width: 36px;
    height: 36px;
}

.card-header h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: #0f172a;
    border: none;
    padding: 0;
    margin: 0;
}

.card-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.75rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 0.95rem;
    color: #ffffff !important;
    transition: filter 0.2s ease;
    cursor: pointer;
    text-align: center;
    margin-top: auto;
}

.download-btn:hover {
    filter: brightness(0.95);
}

.btn-windows { background: linear-gradient(135deg, #00a4ef 0%, var(--win-color) 100%); }
.btn-macos { background: linear-gradient(135deg, #444444 0%, var(--mac-color) 100%); }
.btn-android { background: linear-gradient(135deg, #a4c639 0%, #29b266 100%); }
.btn-ios { background: linear-gradient(135deg, #f74f78 0%, var(--ios-color) 100%); }

/* 内容主体 */
.content-body {
    background: #ffffff;
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--card-shadow);
}

.content-body h2 {
    font-size: 1.55rem;
    margin: 2.25rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #f1f5f9;
    color: #0f172a;
    display: flex;
    align-items: center;
    gap: 10px;
}

.content-body h2:first-of-type {
    margin-top: 0;
}

.content-body p {
    margin-bottom: 1.25rem;
    color: #475569;
    text-align: justify;
}

.inline-code {
    background: #f1f5f9;
    color: #ef4444;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-family: "SF Mono", "Fira Code", monospace;
    font-size: 0.9em;
}

/* 图片占位 */
.post-img-placeholder {
    display: block;
    width: 100%;
    height: auto;
    min-height: 240px;
    max-height: 380px;
    background: var(--img-placeholder-bg);
    border-radius: var(--radius-md);
    margin: 1.5rem 0;
    border: 1px dashed #cbd5e1;
    object-fit: cover;
}

/* 版本时间轴创意版块 */
.version-timeline {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1.5rem 0 2rem;
    padding-left: 1.5rem;
    border-left: 2px solid #e2e8f0;
}

.timeline-item {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.75rem;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -1.65rem;
    top: 0.45rem;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #fff;
    border: 2px solid #cbd5e1;
}

.timeline-badge {
    font-size: 0.8rem;
    font-weight: 700;
    padding: 0.2rem 0.65rem;
    border-radius: 50px;
    color: #fff;
    white-space: nowrap;
}

.timeline-badge.stable { background: #10b981; }
.timeline-badge.feature { background: #6366f1; }
.timeline-badge.pre { background: #f59e0b; color: #0f172a; }

.timeline-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.timeline-desc {
    width: 100%;
    font-size: 0.9rem;
    color: #475569;
    margin-top: 0.2rem;
}

/* 代码块 */
.code-block {
    background: #1e293b;
    color: #e2e8f0;
    padding: 1.25rem;
    border-radius: var(--radius-sm);
    font-family: "SF Mono", "Fira Code", monospace;
    font-size: 0.9rem;
    line-height: 1.8;
    margin: 1.25rem 0;
    overflow-x: auto;
}

.code-block code {
    display: block;
    color: #cbd5e1;
}

/* 安全透明承诺卡片 */
.security-callout {
    display: flex;
    gap: 1rem;
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-radius: var(--radius-sm);
    padding: 1.25rem;
    margin: 1.5rem 0;
    align-items: flex-start;
}

.security-icon {
    font-size: 2rem;
    line-height: 1;
}

.security-text strong {
    display: block;
    margin-bottom: 0.25rem;
    color: #166534;
}

.security-text p {
    margin: 0;
    font-size: 0.9rem;
    color: #475569;
}

/* 移动端流程条 */
.mobile-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    background: #f8fafc;
    border-radius: var(--radius-sm);
    padding: 1.5rem 1rem;
    margin: 1.5rem 0;
    font-weight: 600;
}

.flow-step {
    background: #fff;
    padding: 0.6rem 1rem;
    border-radius: 50px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    font-size: 0.9rem;
    color: #1e293b;
}

.flow-arrow {
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* 侧边栏 */
.sidebar {
    position: sticky;
    top: 94px;
    height: fit-content;
}

.widget {
    background: var(--glass-bg);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    box-shadow: var(--card-shadow);
    margin-bottom: 1.5rem;
}

.widget-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #0f172a;
    border-bottom: 1px solid #e2e8f0;
    padding-bottom: 0.5rem;
}

.toc-list {
    list-style: none;
}

.toc-list li {
    margin-bottom: 0.7rem;
    font-size: 0.9rem;
}

.toc-list a {
    color: var(--text-muted);
    transition: color var(--transition-fast), padding-left 0.2s ease;
    display: inline-block;
}

.toc-list a:hover {
    color: var(--primary-color);
    padding-left: 4px;
}

/* 页脚 - 与首页完全一致 */
footer {
    margin-top: 4rem;
    background: #0f172a;
    color: #94a3b8;
    padding: 3rem 1.5rem 2rem;
    font-size: 0.9rem;
}

.footer-grid {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

@media (max-width: 640px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}

.footer-col h4 {
    color: #e2e8f0;
    font-size: 1rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 0.6rem;
}

.footer-col ul li a {
    color: #94a3b8;
    font-size: 0.88rem;
    transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
    color: #ffffff;
}

.footer-bottom {
    max-width: 1100px;
    margin: 0 auto;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(148, 163, 184, 0.15);
    text-align: center;
    font-size: 0.82rem;
    color: #64748b;
}