:root {
    /* 品牌色 */
    --primary:         #1a73e8;
    --primary-dark:    #0d5bbc;
    --primary-light:   rgba(26, 115, 232, 0.12);
    --primary-rgb:     26, 115, 232;
    --secondary:       #34a853;
    --secondary-rgb:   52, 168, 83;
    --accent:          #6e45e2;
    --accent-rgb:      110, 69, 226;

    /* 状态色 */
    --success: #34a853;
    --warning: #f9ab00;
    --danger:  #ea4335;

    /* 圆角 */
    --radius-sm:  6px;
    --radius-md:  10px;
    --radius-lg:  16px;
    --radius-xl:  24px;

    /* 动效 */
    --ease-fluent: cubic-bezier(0.33, 1, 0.68, 1);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --transition:  0.25s var(--ease-fluent);
}

/* 深色主题（默认） */
[data-theme="dark"] {
    --bg:             #111113;
    --bg-alt:         #0c0c0e;
    --bg-elevated:    #1a1a1e;
    --bg-glass:       rgba(18, 18, 22, 0.85);
    --surface:        #202024;
    --surface-hover:  #2a2a30;
    --border:         rgba(255, 255, 255, 0.08);
    --border-strong:  rgba(255, 255, 255, 0.14);
    --text-primary:   #f0f0f2;
    --text-secondary: #a0a0b0;
    --text-tertiary:  #60606e;
    --shadow-sm:      0 1px 4px rgba(0,0,0,0.3);
    --shadow-md:      0 4px 16px rgba(0,0,0,0.35);
    --shadow-lg:      0 12px 40px rgba(0,0,0,0.45);
}

/* 浅色主题 */
[data-theme="light"] {
    --bg:             #f5f5f7;
    --bg-alt:         #eaeaec;
    --bg-elevated:    #ffffff;
    --bg-glass:       rgba(245, 245, 247, 0.88);
    --surface:        #ffffff;
    --surface-hover:  #f0f0f4;
    --border:         rgba(0, 0, 0, 0.08);
    --border-strong:  rgba(0, 0, 0, 0.14);
    --text-primary:   #1a1a20;
    --text-secondary: #5a5a6e;
    --text-tertiary:  #9090a0;
    --shadow-sm:      0 1px 4px rgba(0,0,0,0.08);
    --shadow-md:      0 4px 16px rgba(0,0,0,0.10);
    --shadow-lg:      0 12px 40px rgba(0,0,0,0.14);
}

/* ==================== 重置 & 基础 ==================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

::-webkit-scrollbar { width: 6px; background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

body {
    font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg);
    color: var(--text-primary);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    transition: background-color 0.35s var(--ease-fluent), color 0.35s var(--ease-fluent);
}

.container {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 24px;
}

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

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

/* ==================== 加载动画 ==================== */
.page-load-animation {
    position: fixed;
    inset: 0;
    background: var(--bg);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeOut 0.5s 1.6s var(--ease-fluent) forwards;
}

.loader-inner {
    position: relative;
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loader-ring {
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 2.5px solid var(--border);
    border-top-color: var(--primary);
    animation: rotation 0.9s linear infinite;
}

.loader-logo {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: var(--bg-glass);
    backdrop-filter: blur(24px) saturate(180%);
    -webkit-backdrop-filter: blur(24px) saturate(180%);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: height var(--transition), background var(--transition);
}

.navbar.scrolled {
    height: 54px;
    background: var(--bg-glass);
}

.navbar-container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
    transition: opacity var(--transition);
}

.logo:hover { opacity: 0.8; }

.logo-icon {
    height: 30px;
    width: auto;
}

.logo-text {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

/* 导航链接 */
.nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition), background var(--transition);
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: var(--surface-hover);
}

/* 导航右侧操作区 */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

/* 主题切换按钮 */
.theme-toggle {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    transition: all var(--transition);
}

.theme-toggle:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
    border-color: var(--border-strong);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-secondary);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    transition: all var(--transition);
}

.mobile-menu-btn:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

/* 移动端菜单 */
.mobile-nav {
    display: none;
    flex-direction: column;
    background: var(--bg-glass);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-top: 1px solid var(--border);
    padding: 12px 0;
}

.mobile-nav.open { display: flex; }

.mobile-nav-link {
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color var(--transition), background var(--transition);
}

.mobile-nav-link:hover {
    color: var(--text-primary);
    background: var(--surface-hover);
}

/* ==================== 按钮 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
    font-family: inherit;
}

.btn i { font-size: 1.05rem; }

.btn-primary {
    background: var(--primary);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.btn-primary::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0);
    transition: background var(--transition);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-primary:active { transform: translateY(0); }

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

.btn-ghost:hover {
    background: var(--surface-hover);
    border-color: var(--border-strong);
    transform: translateY(-1px);
}

.btn-lg {
    padding: 14px 32px;
    font-size: 1rem;
    border-radius: var(--radius-md);
}

/* ==================== Hero ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: 60px;
    background: var(--bg);
}

.hero-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0.5;
    pointer-events: none;
}

.hero-glow {
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    width: 700px;
    height: 500px;
    background: radial-gradient(ellipse, rgba(var(--primary-rgb), 0.10) 0%, rgba(var(--secondary-rgb), 0.06) 50%, transparent 70%);
    pointer-events: none;
    filter: blur(40px);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 680px;
    padding: 60px 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 100px;
    border: 1px solid var(--border-strong);
    background: var(--surface);
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 28px;
    backdrop-filter: blur(8px);
}

.hero-badge i { color: var(--secondary); font-size: 0.9rem; }

.hero-title {
    font-size: clamp(3rem, 7vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 40px;
    max-width: 560px;
}

.hero-cta {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 32px;
}

.hero-meta {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.hero-meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.hero-meta-item i { color: var(--secondary); }

.hero-scroll-hint {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-tertiary);
    font-size: 1.2rem;
    animation: float 2.5s ease-in-out infinite;
    z-index: 2;
}

/* ==================== 统计数据 ==================== */
.stats-section {
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 48px 0;
}

.stats-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
}

.stat-item {
    flex: 1;
    text-align: center;
    padding: 16px 24px;
}

.stat-divider {
    width: 1px;
    height: 48px;
    background: var(--border);
    flex-shrink: 0;
}

.stat-number {
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 6px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ==================== 通用 Section ==================== */
.section {
    padding: 100px 0;
    background: var(--bg);
}

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

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 100px;
    border: 1px solid var(--border);
    background: var(--surface);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ==================== 特性卡片 ==================== */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.feature-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s var(--ease-fluent);
}

.feature-card:hover {
    border-color: var(--border-strong);
    transform: translateY(-4px);
    background: var(--surface-hover);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon-wrap {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 20px;
    transition: all var(--transition);
}

.feature-card:hover .feature-icon-wrap {
    background: var(--primary);
    color: #fff;
    transform: scale(1.05);
}

/* 兼容动态生成的图标 */
.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 20px;
    transition: all var(--transition);
}

.feature-icon i { font-size: 1.4rem; }

.feature-card:hover .feature-icon {
    background: var(--primary);
    color: #fff;
    transform: scale(1.05);
    animation: none;
}

.feature-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.feature-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.feature-desc + .feature-desc {
    margin-top: 8px;
    font-size: 0.82rem;
    color: var(--text-tertiary);
    font-style: italic;
}

/* ==================== 架构 ==================== */
.architecture-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
}

.architecture-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.architecture-feature {
    position: relative;
    padding: 20px 0 20px 28px;
    border-left: 2px solid var(--border);
    transition: border-color var(--transition);
}

.architecture-feature:hover {
    border-left-color: var(--primary);
}

.architecture-feature::before {
    content: '';
    position: absolute;
    left: -5px;
    top: 24px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border-strong);
    transition: background var(--transition), transform var(--transition);
}

.architecture-feature:hover::before {
    background: var(--primary);
    transform: scale(1.4);
}

.architecture-feature-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
    letter-spacing: -0.01em;
}

.architecture-feature-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.architecture-image {
    position: sticky;
    top: 80px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
}

.architecture-image img {
    width: 100%;
    transition: transform 0.6s var(--ease-fluent);
}

.architecture-image:hover img {
    transform: scale(1.02);
}

/* ==================== 演示区域 ==================== */
.demo-section { background: var(--bg); padding-bottom: 0; }

.demo-blocks {
    margin-top: 64px;
    display: flex;
    flex-direction: column;
    gap: 0;
}

.demo-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    padding: 80px 24px;
    max-width: 1160px;
    margin: 0 auto;
}

.demo-container--reverse { }

.demo-container:nth-child(even) {
    background: var(--bg-alt);
}

.demo-heading {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.demo-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.demo-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--surface);
    transition: transform 0.4s var(--ease-fluent), border-color var(--transition);
}

.demo-image:hover {
    transform: translateY(-6px);
    border-color: var(--border-strong);
}

.demo-image img {
    width: 100%;
    height: auto;
}

/* ==================== 更新日志 ==================== */
.changelog-wrap {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 40px;
    overflow: hidden;
}

.changelog-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 6px 16px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.88rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

.tab-btn:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

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

.changelog-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.version-card {
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--bg);
    overflow: hidden;
    transition: border-color var(--transition);
}

.version-card:hover {
    border-color: var(--border-strong);
}

.version-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.version-num {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.version-date {
    font-size: 0.82rem;
    color: var(--text-tertiary);
}

.version-type {
    margin-left: auto;
    padding: 2px 10px;
    border-radius: 100px;
    font-size: 0.78rem;
    font-weight: 600;
}

.type-major { background: rgba(var(--primary-rgb),0.12); color: var(--primary); }
.type-minor { background: rgba(var(--secondary-rgb),0.12); color: var(--secondary); }
.type-patch { background: rgba(234,67,53,0.10); color: var(--danger); }

.version-body {
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.change-item {
    display: flex;
    align-items: baseline;
    gap: 10px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.change-tag {
    flex-shrink: 0;
    padding: 1px 8px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
}

.change-added   .change-tag { background: rgba(var(--secondary-rgb),0.12); color: var(--secondary); }
.change-fixed   .change-tag { background: rgba(var(--primary-rgb),0.12); color: var(--primary); }
.change-improved .change-tag { background: rgba(249,171,0,0.12); color: var(--warning); }
.change-removed .change-tag { background: rgba(234,67,53,0.10); color: var(--danger); }

/* ==================== 社区 ==================== */
.community-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.community-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 32px;
    transition: all var(--transition);
    display: flex;
    flex-direction: column;
}

.community-card:hover {
    border-color: var(--border-strong);
    transform: translateY(-4px);
}

.community-card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 20px;
    transition: all var(--transition);
}

.community-card:hover .community-card-icon {
    background: var(--primary);
    color: #fff;
}

.community-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.community-card-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
    flex: 1;
    margin-bottom: 20px;
}

.community-card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--primary);
    transition: gap var(--transition);
}

.community-card-link i { font-size: 0.9rem; }

.community-card-link:hover { gap: 10px; }

/* ==================== 下载区域 ==================== */
.download-section {
    position: relative;
    padding: 120px 0;
    background: var(--bg-alt);
    border-top: 1px solid var(--border);
    overflow: hidden;
    text-align: center;
}

.download-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.5;
}

.download-container {
    position: relative;
    z-index: 2;
}

.download-content {
    max-width: 640px;
    margin: 0 auto;
}

.download-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 800;
    letter-spacing: -0.025em;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.download-title span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.download-subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 48px;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 28px;
    flex-wrap: wrap;
}

.download-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    flex-wrap: wrap;
    font-size: 0.85rem;
    color: var(--text-tertiary);
}

.download-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.download-meta i { color: var(--secondary); }

/* ==================== QQ 提示框 ==================== */
.qq-alert-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 1100;
    animation: slideIn 0.35s var(--ease-fluent) forwards;
}

.fluent-alert {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 16px;
    background: var(--surface);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    min-width: 280px;
    max-width: 340px;
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}

.fluent-alert-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: rgba(var(--primary-rgb), 0.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.fluent-alert-content { flex: 1; min-width: 0; }

.fluent-alert-title {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.fluent-alert-desc {
    font-size: 0.82rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.fluent-alert-desc strong { color: var(--text-primary); }

.fluent-alert-close {
    width: 24px;
    height: 24px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    transition: all var(--transition);
    flex-shrink: 0;
}

.fluent-alert-close:hover {
    background: var(--surface-hover);
    color: var(--text-primary);
}

.copy-btn {
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface-hover);
    color: var(--primary);
    font-size: 0.78rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

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

/* ==================== 页脚 ==================== */
footer {
    background: var(--bg-elevated);
    border-top: 1px solid var(--border);
    padding: 80px 0 36px;
}

.footer-container {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-logo {
    display: inline-block;
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 24px;
    max-width: 320px;
}

.footer-social {
    display: flex;
    gap: 8px;
}

.footer-social a {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.95rem;
    transition: all var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    transform: translateY(-2px);
}

.footer-links h3 {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 20px;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.88rem;
    color: var(--text-secondary);
    transition: color var(--transition), gap var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
    gap: 8px;
}

.footer-links a i { font-size: 0.85rem; }

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 28px;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
    gap: 12px;
}

.copyright-text {
    font-size: 0.82rem;
    color: var(--text-tertiary);
}

.footer-version-tag {
    font-size: 0.78rem;
    padding: 2px 10px;
    border-radius: 100px;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-tertiary);
    font-family: 'SF Mono', 'Cascadia Code', Consolas, monospace;
}

/* ==================== 回到顶部 ==================== */
.back-to-top {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--surface);
    border: 1px solid var(--border-strong);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    z-index: 800;
    opacity: 0;
    transform: translateY(12px);
    pointer-events: none;
    transition: all var(--transition);
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* ==================== 动画 ==================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeOut {
    to { opacity: 0; visibility: hidden; pointer-events: none; }
}

@keyframes float {
    0%, 100% { transform: translateY(0) translateX(-50%); }
    50%       { transform: translateY(-10px) translateX(-50%); }
}

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

@keyframes slideIn {
    from { transform: translateX(110%); opacity: 0; }
    to   { transform: translateX(0);    opacity: 1; }
}

@keyframes slideOut {
    from { transform: translateX(0);    opacity: 1; }
    to   { transform: translateX(110%); opacity: 0; }
}

.animate-fadeIn {
    animation: fadeIn 0.7s var(--ease-fluent) both;
}

.delay-1 { animation-delay: 0.12s; }
.delay-2 { animation-delay: 0.24s; }
.delay-3 { animation-delay: 0.36s; }

/* ==================== 响应式 ==================== */
@media (max-width: 1024px) {
    .architecture-container {
        grid-template-columns: 1fr;
    }
    .architecture-image {
        position: static;
        max-width: 560px;
        margin: 0 auto;
    }
    .footer-container {
        grid-template-columns: 1fr 1fr;
    }
    .footer-brand {
        grid-column: 1 / -1;
    }
    .footer-desc { max-width: 100%; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .mobile-menu-btn { display: flex; }

    .stats-container {
        display: grid;
        grid-template-columns: 1fr 1fr;
    }
    .stat-divider { display: none; }

    .demo-container {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 60px 24px;
    }
    .demo-container--reverse .demo-image { order: -1; }

    .changelog-wrap { padding: 24px 20px; }

    .footer-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-cta { flex-direction: column; align-items: flex-start; }
    .hero-meta { flex-direction: column; gap: 8px; }

    .qq-alert-container {
        top: auto;
        bottom: 80px;
        left: 16px;
        right: 16px;
    }
    .fluent-alert { min-width: unset; max-width: 100%; }
}

@media (max-width: 480px) {
    .section { padding: 72px 0; }
    .stats-container { grid-template-columns: 1fr; }
    .stat-divider { width: 40px; height: 1px; margin: 0 auto; display: block; }
    .features { grid-template-columns: 1fr; }
    .community-cards { grid-template-columns: 1fr; }
    .download-section { padding: 80px 0; }
}