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

:root {
    /* 颜色系统 */
    --color-primary: #0071e3;
    --color-primary-hover: #0077ed;
    --color-text-primary: #1d1d1f;
    --color-text-secondary: #6e6e73;
    --color-bg-light: #ffffff;
    --color-bg-dark: #0f172a;
    --color-bg-dark-soft: #1e293b;
    --color-bg-gray: #f5f5f7;
    --color-border: #d2d2d7;
    
    /* 字体 */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    
    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;
    --spacing-xxl: 120px;
    
    /* 动画 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --shadow-xl: 0 18px 50px rgba(20, 26, 36, 0.14);
    --glass-border-light: rgba(255, 255, 255, 0.45);
    --glass-border-dark: rgba(255, 255, 255, 0.14);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    color: var(--color-text-primary);
    background-color: var(--color-bg-light);
    background-image: radial-gradient(circle at 0% 0%, rgba(0, 113, 227, 0.08), transparent 40%);
    line-height: 1.6;
    overflow-x: hidden;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: rgba(0, 113, 227, 0.16);
}

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 48px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text-primary);
    text-decoration: none;
}

.nav-logo img {
    width: 28px;
    height: 28px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
}

.nav-menu a {
    position: relative;
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: 14px;
    transition: color var(--transition-fast);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), #00a3ff);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-fast);
}

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

.nav-menu a:hover::after {
    transform: scaleX(1);
}

.nav-actions .btn-primary {
    padding: 6px 16px;
    background-color: var(--color-primary);
    color: white;
    text-decoration: none;
    border-radius: 20px;
    font-size: 14px;
    transition: all var(--transition-fast);
}

.nav-actions .btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: scale(1.02);
}

/* ==================== Hero 区域 ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-md);
    padding-top: calc(var(--spacing-xxl) + 48px);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(0, 113, 227, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: linear-gradient(rgba(255, 255, 255, 0.12) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.12) 1px, transparent 1px);
    background-size: 42px 42px;
    opacity: 0.18;
    mask-image: radial-gradient(circle at 50% 35%, black 20%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(255, 255, 255, 0.55);
    background: rgba(255, 255, 255, 0.52);
    backdrop-filter: blur(8px);
    color: #243244;
    border-radius: 999px;
    padding: 8px 14px;
    margin-bottom: var(--spacing-md);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.04em;
}

.hero-title {
    font-size: clamp(48px, 8vw, 96px);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(24px, 4vw, 48px);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: clamp(16px, 2vw, 21px);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.btn-hero-primary,
.btn-hero-secondary {
    padding: 14px 32px;
    border-radius: 24px;
    font-size: 17px;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-normal);
    display: inline-block;
}

.btn-hero-primary {
    background-color: var(--color-primary);
    color: white;
    box-shadow: 0 10px 24px rgba(0, 113, 227, 0.24);
}

.btn-hero-primary:hover {
    background-color: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-hero-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-hero-secondary:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.hero-image {
    margin-top: var(--spacing-xl);
    max-width: 900px;
    width: 100%;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--glass-border-light);
    filter: saturate(1.05) contrast(1.02);
}

/* ==================== 通用区块样式 ==================== */
.section {
    padding: clamp(72px, 9vw, 120px) var(--spacing-md);
    position: relative;
}

.section + .section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: min(92%, 1240px);
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.08), transparent);
}

.section-light {
    background-color: var(--color-bg-light);
}

.section-dark {
    background: linear-gradient(135deg, #0f172a 0%, #172554 48%, #1e293b 100%);
    color: white;
    overflow: hidden;
}

.section-dark::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 18% 22%, rgba(129, 140, 248, 0.16), transparent 42%), radial-gradient(circle at 82% 78%, rgba(56, 189, 248, 0.12), transparent 46%);
    pointer-events: none;
}

.section-dark > * {
    position: relative;
    z-index: 1;
}

.section-dark .section-title,
.section-dark .feature-title {
    color: white;
}

.section-dark .section-subtitle,
.section-dark .feature-description {
    color: rgba(241, 245, 249, 0.84);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(38px, 5.2vw, 62px);
    font-weight: 750;
    line-height: 1.12;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: clamp(18px, 2.2vw, 24px);
    color: #4b5563;
    text-align: center;
    max-width: 860px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.7;
}

.section-tag {
    display: table;
    margin: 0 auto 12px;
    padding: 6px 12px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #0f3f75;
    background: linear-gradient(135deg, rgba(0, 113, 227, 0.18), rgba(0, 163, 255, 0.2));
    border: 1px solid rgba(0, 113, 227, 0.32);
}

.section-dark .section-tag {
    color: rgba(241, 245, 249, 0.94);
    background: rgba(148, 163, 184, 0.12);
    border-color: rgba(226, 232, 240, 0.3);
}

/* ==================== 特性网格 ==================== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

#overview .feature-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-card {
    padding: var(--spacing-lg);
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    text-align: center;
    border: 1px solid rgba(226, 232, 240, 0.16);
    backdrop-filter: blur(6px);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
    transition: all var(--transition-normal);
}

.section-light .feature-card {
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    border-color: rgba(15, 23, 42, 0.08);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: auto;
    height: auto;
    line-height: 1;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    background: transparent;
    box-shadow: none;
}

.feature-icon i {
    display: inline-block;
    font-size: 46px;
    background: var(--icon-gradient, linear-gradient(135deg, #667eea 0%, #764ba2 100%));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.feature-icon.stat-number {
    display: block;
    font-size: clamp(52px, 8vw, 72px);
    font-weight: 800;
    line-height: 0.95;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #7c3aed 0%, #2563eb 52%, #0ea5e9 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
    text-shadow: 0 8px 20px rgba(37, 99, 235, 0.22);
}

.icon-indigo {
    --icon-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.icon-pink {
    --icon-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.icon-cyan {
    --icon-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.icon-amber {
    --icon-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
}

.icon-mint {
    --icon-gradient: linear-gradient(135deg, #00b09b 0%, #96c93d 100%);
}

.icon-peach {
    --icon-gradient: linear-gradient(135deg, #ff9a8b 0%, #ff6a88 100%);
}

.icon-python {
    --icon-gradient: linear-gradient(135deg, #3776ab 0%, #ffd343 100%);
}

.icon-java {
    --icon-gradient: linear-gradient(135deg, #007396 0%, #ea2d2e 100%);
}

.icon-tools {
    --icon-gradient: linear-gradient(135deg, #6f42c1 0%, #00c6ff 100%);
}

.feature-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

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

.section-dark .feature-card p {
    color: rgba(226, 232, 240, 0.8);
}

/* ==================== 分栏布局 ==================== */
.split-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.split-content.reverse {
    direction: rtl;
}

.split-content.reverse > * {
    direction: ltr;
}

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

.feature-title {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.feature-description {
    font-size: clamp(16px, 2vw, 19px);
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.feature-list {
    list-style: none;
    font-size: 17px;
}

.feature-list li {
    padding: var(--spacing-xs) 0;
    color: var(--color-text-secondary);
}

.section-dark .feature-list li {
    color: rgba(226, 232, 240, 0.84);
}

.split-image img {
    width: 100%;
    height: auto;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

.arch-diagram {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
    border-radius: 30px;
    padding: 4rem 3rem;
    margin-top: 3rem;
    position: relative;
    overflow: hidden;
}

.arch-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.arch-box {
    background: white;
    padding: 1.75rem 1.5rem;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    min-width: 160px;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.arch-box:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.arch-box.mini {
    border-color: #f59e0b;
    background: linear-gradient(135deg, #fffbeb 0%, #fff 100%);
}

.arch-box.adapter {
    border-color: #6366f1;
    background: linear-gradient(135deg, #eef2ff 0%, #fff 100%);
}

.arch-box.mc {
    border-color: #10b981;
    background: linear-gradient(135deg, #ecfdf5 0%, #fff 100%);
}

.arch-box strong {
    display: block;
    font-size: 1rem;
    margin-bottom: 0.35rem;
    color: #0f172a;
}

.arch-box small {
    color: #64748b;
    font-size: 0.8rem;
}

.arch-arrow {
    font-size: 1.5rem;
    color: #6366f1;
    animation: pulse 2s infinite;
}

/* ==================== 主题网格 ==================== */
.theme-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.theme-card {
    background-color: var(--color-bg-gray);
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid rgba(0, 0, 0, 0.08);
    transition: all var(--transition-normal);
}

.theme-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.theme-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.theme-card h3 {
    font-size: 20px;
    font-weight: 600;
    padding: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
}

.theme-card p {
    color: var(--color-text-secondary);
    padding: 0 var(--spacing-md) var(--spacing-md);
}

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

.community-card {
    text-align: center;
    padding: 2.5rem;
    border-radius: 22px;
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid rgba(15, 23, 42, 0.08);
    transition: all var(--transition-normal);
    text-decoration: none;
    color: var(--color-text-primary);
}

.community-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    background: white;
}

.community-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: auto;
    height: auto;
    font-size: 2.2rem;
    margin: 0 auto 1.5rem;
    color: var(--color-primary);
}

.community-icon i {
    background: var(--community-gradient, linear-gradient(135deg, #667eea 0%, #764ba2 100%));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.community-card:nth-child(1) .community-icon {
    --community-gradient: linear-gradient(135deg, #111827 0%, #4b5563 100%);
}

.community-card:nth-child(2) .community-icon {
    --community-gradient: linear-gradient(135deg, #5865f2 0%, #8b5cf6 100%);
}

.community-card:nth-child(3) .community-icon {
    --community-gradient: linear-gradient(135deg, #0ea5e9 0%, #3b82f6 100%);
}

.community-card:nth-child(4) .community-icon {
    --community-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.community-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.community-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

/* ==================== 状态网格 ==================== */
.status-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.status-item {
    text-align: center;
    padding: var(--spacing-lg);
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(14, 165, 233, 0.12));
    border: 1px solid rgba(99, 102, 241, 0.18);
    transition: all var(--transition-normal);
}

.status-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

.status-number {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
    color: #1d4ed8;
}

.status-label {
    color: #334155;
    font-weight: 600;
    font-size: 15px;
}

/* ==================== 技术栈网格 ==================== */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.tech-card {
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.06);
    border-radius: 22px;
    border: 1px solid rgba(226, 232, 240, 0.2);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
    transition: all var(--transition-normal);
}

.tech-card:hover {
    transform: translateY(-6px);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-lg);
}

.tech-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: var(--spacing-md);
}

.tech-header h3 {
    font-size: 22px;
    font-weight: 700;
    margin: 0;
    color: #f8fafc;
}

.tech-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: white;
}

.tech-card:nth-child(1) .tech-icon {
    background: #3776ab;
}

.tech-card:nth-child(2) .tech-icon {
    background: #007396;
}

.tech-card:nth-child(3) .tech-icon {
    background: #6f42c1;
}

.tech-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.tech-list li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    color: rgba(226, 232, 240, 0.9);
    font-size: 15px;
    line-height: 1.6;
    margin-bottom: 10px;
}

.tech-list li i {
    color: #67e8f9;
    margin-top: 5px;
    font-size: 12px;
}

/* ==================== CTA 区域 ==================== */
.section-cta {
    background: linear-gradient(135deg, #4f46e5 0%, #6366f1 45%, #0ea5e9 100%);
    color: white;
    text-align: center;
    overflow: hidden;
}

.section-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 16% 18%, rgba(255, 255, 255, 0.22), transparent 42%), radial-gradient(circle at 86% 76%, rgba(255, 255, 255, 0.16), transparent 44%);
    pointer-events: none;
}

.section-cta > * {
    position: relative;
    z-index: 1;
}

.section-cta .section-tag {
    color: rgba(255, 255, 255, 0.95);
    background: rgba(255, 255, 255, 0.14);
    border-color: rgba(255, 255, 255, 0.35);
}

.cta-title {
    font-size: clamp(36px, 5vw, 56px);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: white;
}

.cta-subtitle {
    font-size: clamp(18px, 2.5vw, 24px);
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.9);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.download-card {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.24);
    border-radius: 22px;
    padding: var(--spacing-lg);
    text-align: left;
    transition: all var(--transition-normal);
}

.download-card:hover {
    transform: translateY(-6px);
    background: rgba(255, 255, 255, 0.16);
    box-shadow: var(--shadow-lg);
}

.download-card h3 {
    font-size: 24px;
    margin-bottom: 8px;
    color: white;
}

.download-card .version {
    color: rgba(255, 255, 255, 0.95);
    font-weight: 600;
    margin-bottom: 10px;
}

.download-card p {
    color: rgba(255, 255, 255, 0.86);
    margin-bottom: 16px;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    padding: 10px 16px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.5);
    color: white;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.btn-download:hover {
    background: rgba(255, 255, 255, 0.16);
    border-color: rgba(255, 255, 255, 0.75);
}

.cta-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.btn-cta-primary,
.btn-cta-secondary {
    padding: 14px 32px;
    border-radius: 24px;
    font-size: 17px;
    font-weight: 500;
    text-decoration: none;
    transition: all var(--transition-normal);
    display: inline-block;
}

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

.btn-cta-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-cta-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.btn-cta-secondary:hover {
    background-color: white;
    color: var(--color-primary);
}

.cta-note {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
}

/* ==================== 页脚 ==================== */
.footer {
    background-color: var(--color-bg-gray);
    padding: var(--spacing-xl) var(--spacing-md) var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 20px;
    font-weight: 600;
}

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

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

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

.footer-column a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 14px;
    line-height: 2;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 14px;
}

.footer-bottom p {
    margin: var(--spacing-xs) 0;
}

/* ==================== 动画 ==================== */
/* 动画元素初始状态 */
.fade-in,
.fade-in-up,
.fade-in-left,
.fade-in-right {
    opacity: 0;
    transform: none;
    transition: opacity 0.45s ease;
}

/* 动画触发后保持最终状态 */
.fade-in.visible {
    opacity: 1;
}

.fade-in-up.visible {
    opacity: 1;
}

.fade-in-left.visible {
    opacity: 1;
}

.fade-in-right.visible {
    opacity: 1;
}

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

/* ==================== 响应式设计 ==================== */
@media (max-width: 1024px) {
    .split-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .split-content.reverse {
        direction: ltr;
    }
    
    .nav-menu {
        display: none;
    }

    .arch-flow {
        flex-direction: column;
    }

    .arch-arrow {
        transform: rotate(90deg);
    }

    #overview .feature-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-lg: 32px;
        --spacing-xl: 48px;
        --spacing-xxl: 64px;
    }
    
    .hero {
        min-height: 80vh;
        padding: var(--spacing-xl) var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-xl) var(--spacing-sm);
    }
    
    .feature-grid,
    .theme-grid,
    .tech-grid,
    .status-grid,
    .download-grid,
    .community-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    #overview .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 var(--spacing-sm);
    }
    
    .nav-logo span {
        display: none;
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-hero-primary,
    .btn-hero-secondary {
        width: 100%;
        text-align: center;
    }
    
    .cta-actions {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-cta-primary,
    .btn-cta-secondary {
        width: 100%;
        text-align: center;
    }
}

/* ==================== 打印样式 ==================== */
@media print {
    .navbar,
    .hero-actions,
    .cta-actions,
    .footer {
        display: none;
    }
}

/* ==================== 性能优化 ==================== */
/* 减少重绘 */
.navbar,
.feature-card,
.theme-card,
.tech-card {
    will-change: transform;
}

/* 硬件加速 */
.hero-image,
.split-image img {
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* ==================== 无障碍优化 ==================== */
/* 跳过导航链接 */
.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: 8px;
    text-decoration: none;
    z-index: 10000;
}

.skip-to-content:focus {
    top: 0;
}

/* 焦点可见性 */
a:focus,
button:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ==================== 加载动画 ==================== */
.loading {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-light);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    opacity: 1;
    transition: opacity 0.5s ease;
}

.loading.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ==================== 额外的动画效果 ==================== */
@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

.hero-image img {
    animation: none;
}

/* ==================== 暗色模式支持（可选） ==================== */
@media (prefers-color-scheme: dark) {
    /* 如果需要自动暗色模式，可以在这里添加样式 */
    /* 目前保持手动控制 */
}

/* ==================== 减少动画（辅助功能） ==================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .hero-image img {
        animation: none;
    }
}

/* ==================== 高对比度模式 ==================== */
@media (prefers-contrast: high) {
    :root {
        --color-text-primary: #000000;
        --color-text-secondary: #333333;
        --color-border: #000000;
    }
    
    .btn-primary,
    .btn-hero-primary,
    .btn-cta-primary {
        border: 2px solid currentColor;
    }
}

/* ==================== 关键修复 ==================== */
/* 确保动画后元素保持可见 */
.visible {
    opacity: 1 !important;
}

/* 确保 Hero 区域元素始终可见 */
.hero-title,
.hero-subtitle,
.hero-description,
.hero-actions {
    opacity: 1;
}

/* 确保图片加载后可见 */
img {
    opacity: 1;
}

/* 修复卡片在某些情况下的显示问题 */
.feature-card,
.theme-card,
.tech-card {
    opacity: 1;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

/* 确保分栏内容可见 */
.split-text,
.split-image {
    opacity: 1;
}