```css
:root {
    --primary: #e05a2b;
    --primary-dark: #b8431c;
    --primary-light: #ff8a5c;
    --secondary: #f5b342;
    --secondary-dark: #d99a2b;
    --accent: #ff6b6b;
    --bg: #fefcf9;
    --bg-alt: #faf6f0;
    --surface: #ffffff;
    --surface-glass: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(255, 255, 255, 0.5);
    --text: #2d2a24;
    --text-light: #6b6258;
    --text-muted: #9a9086;
    --border: #e8e0d8;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
    --shadow-primary: 0 8px 24px rgba(224, 90, 43, 0.28);
    --radius-sm: 10px;
    --radius: 16px;
    --radius-lg: 24px;
    --radius-full: 999px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    --gradient-primary: linear-gradient(135deg, #e05a2b 0%, #f5b342 100%);
    --gradient-warm: linear-gradient(135deg, #ff6b6b 0%, #e05a2b 50%, #f5b342 100%);
    --gradient-cool: linear-gradient(135deg, #e05a2b 0%, #ff8a5c 50%, #f5b342 100%);
    --gradient-mesh: radial-gradient(at 20% 30%, rgba(224, 90, 43, 0.18) 0%, transparent 50%),
                     radial-gradient(at 80% 70%, rgba(245, 179, 66, 0.18) 0%, transparent 50%),
                     radial-gradient(at 50% 50%, rgba(255, 107, 107, 0.1) 0%, transparent 60%);
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", "Fira Code", "JetBrains Mono", Consolas, monospace;
}

[data-theme="dark"] {
    --primary: #f07a4a;
    --primary-dark: #d45f30;
    --primary-light: #ff9a70;
    --secondary: #f5c542;
    --secondary-dark: #d9a82b;
    --accent: #ff7b7b;
    --bg: #1a1816;
    --bg-alt: #201e1b;
    --surface: #242220;
    --surface-glass: rgba(36, 34, 32, 0.78);
    --glass-border: rgba(255, 255, 255, 0.08);
    --text: #f0ece6;
    --text-light: #b5ada4;
    --text-muted: #7d746a;
    --border: #3d3834;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
    --shadow-primary: 0 8px 24px rgba(240, 122, 74, 0.3);
    --gradient-primary: linear-gradient(135deg, #f07a4a 0%, #f5c542 100%);
    --gradient-warm: linear-gradient(135deg, #ff7b7b 0%, #f07a4a 50%, #f5c542 100%);
    --gradient-cool: linear-gradient(135deg, #f07a4a 0%, #ff9a70 50%, #f5c542 100%);
    --gradient-mesh: radial-gradient(at 20% 30%, rgba(240, 122, 74, 0.15) 0%, transparent 50%),
                     radial-gradient(at 80% 70%, rgba(245, 197, 66, 0.12) 0%, transparent 50%),
                     radial-gradient(at 50% 50%, rgba(255, 123, 123, 0.08) 0%, transparent 60%);
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background var(--transition-slow), color var(--transition-slow);
    overflow-x: hidden;
    background-image: var(--gradient-mesh);
    background-attachment: fixed;
}

img,
svg {
    max-width: 100%;
    height: auto;
    display: block;
}

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

a:hover {
    color: var(--primary-dark);
}

ul,
ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

input {
    font-family: inherit;
}

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

/* ===== 滚动条美化 ===== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-alt);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg-alt);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* ===== 容器 ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* ===== 导航吸顶 ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--surface-glass);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    transition: background var(--transition-slow), border-color var(--transition-slow), box-shadow var(--transition);
}

.navbar::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition);
}

.navbar:hover::after {
    opacity: 1;
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    gap: 16px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.3rem;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: transform var(--transition), filter var(--transition);
    flex-shrink: 0;
}

.logo:hover {
    transform: scale(1.03);
    filter: drop-shadow(0 4px 12px rgba(224, 90, 43, 0.3));
}

.logo svg {
    width: 36px;
    height: 36px;
    transition: transform var(--transition-slow);
}

.logo:hover svg {
    transform: rotate(-8deg) scale(1.08);
}

.logo span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    white-space: nowrap;
}

/* 导航链接 */
.nav-links {
    display: flex;
    gap: 4px;
    list-style: none;
    align-items: center;
}

.nav-links a {
    display: block;
    text-decoration: none;
    color: var(--text);
    font-size: 0.92rem;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    position: relative;
    transition: color var(--transition), background var(--transition);
    white-space: nowrap;
}

.nav-links a::before {
    content: "";
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: transform var(--transition);
    transform-origin: center;
}

.nav-links a:hover {
    color: var(--primary);
    background: rgba(224, 90, 43, 0.06);
}

.nav-links a:hover::before {
    transform: translateX(-50%) scaleX(1);
}

/* 导航操作区 */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

/* 搜索框 */
.search-box {
    display: flex;
    align-items: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    padding: 4px 6px 4px 16px;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(224, 90, 43, 0.12);
    background: var(--surface);
}

.search-box input {
    border: none;
    background: transparent;
    outline: none;
    color: var(--text);
    font-size: 0.88rem;
    width: 140px;
    padding: 6px 0;
    transition: width var(--transition);
}

.search-box input:focus {
    width: 180px;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box button {
    background: var(--gradient-primary);
    border: none;
    cursor: pointer;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    transition: transform var(--transition), box-shadow var(--transition);
    flex-shrink: 0;
}

.search-box button:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-primary);
}

.search-box button:active {
    transform: scale(0.95);
}

/* 主题切换按钮 */
.theme-toggle {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--text);
    transition: transform var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition);
    flex-shrink: 0;
}

.theme-toggle:hover {
    transform: rotate(20deg) scale(1.08);
    border-color: var(--primary);
    box-shadow: var(--shadow-primary);
}

.theme-toggle:active {
    transform: rotate(20deg) scale(0.95);
}

/* 移动菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    width: 40px;
    height: 40px;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--text);
    align-items: center;
    justify-content: center;
    transition: background var(--transition), border-color var(--transition);
    flex-shrink: 0;
}

.mobile-menu-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* ===== 面包屑 ===== */
.breadcrumb {
    font-size: 0.85rem;
    color: var(--text-light);
    margin: 20px 0 0;
    display: flex;
    align-items: center;
    gap: 6px;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--text-light);
    text-decoration: none;
    transition: color var(--transition);
    padding: 2px 4px;
    border-radius: 4px;
}

.breadcrumb a:hover {
    color: var(--primary);
    background: rgba(224, 90, 43, 0.06);
}

.breadcrumb span {
    color: var(--text-muted);
}

/* ===== Banner轮播 ===== */
.banner {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    margin: 24px 0;
    height: 360px;
    background: var(--gradient-warm);
    box-shadow: var(--shadow-lg);
    isolation: isolate;
}

.banner::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 30% 40%, rgba(255, 255, 255, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 70% 60%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
    z-index: 1;
    pointer-events: none;
}

.banner::after {
    content: "";
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.04'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    z-index: 0;
    pointer-events: none;
}

.banner-slide {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.8s ease, transform 0.8s ease;
    padding: 40px;
    z-index: 2;
    transform: scale(1.05);
}

.banner-slide.active {
    opacity: 1;
    transform: scale(1);
}

.banner-content {
    text-align: center;
    color: #fff;
    max-width: 700px;
    position: relative;
    z-index: 3;
}

.banner-content h2 {
    font-size: 2.4rem;
    margin-bottom: 14px;
    text-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.banner-content p {
    font-size: 1.08rem;
    opacity: 0.95;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    line-height: 1.6;
}

.banner-dots {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 4;
}

.banner-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

.banner-dots span:hover {
    background: rgba(255, 255, 255, 0.8);
    transform: scale(1.2);
}

.banner-dots span.active {
    background: #fff;
    width: 28px;
    border-radius: var(--radius-full);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

/* ===== 数字统计 ===== */
.stats-row {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 40px 0;
}

.stat-item {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 30px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-slow);
}

.stat-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: rgba(224, 90, 43, 0.3);
}

.stat-item:hover::before {
    transform: scaleX(1);
}

.stat-number {
    font-size: 2.4rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
    letter-spacing: -0.02em;
    font-variant-numeric: tabular-nums;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: 8px;
    font-weight: 500;
}

/* ===== 通用区块 ===== */
section {
    margin: 56px 0;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--text);
    letter-spacing: -0.02em;
    line-height: 1.3;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 0;
    width: 48px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

.section-sub {
    color: var(--text-light);
    margin-bottom: 32px;
    margin-top: 14px;
    font-size: 0.95rem;
}

/* 标题层级 */
section h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 28px 0 12px;
    color: var(--text);
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    gap: 8px;
}

section h3::before {
    content: "";
    width: 4px;
    height: 18px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

section p {
    color: var(--text-light);
    margin-bottom: 14px;
    line-height: 1.8;
}

section p strong {
    color: var(--text);
    font-weight: 600;
}

section ul {
    padding-left: 0;
    margin: 14px 0;
}

section ul li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 10px;
    color: var(--text-light);
    line-height: 1.7;
}

section ul li::before {
    content: "";
    position: absolute;
    left: 6px;
    top: 11px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gradient-primary);
}

section ul li strong {
    color: var(--text);
    font-weight: 600;
}

/* 首屏H1 */
section h1 {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.35;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--text) 0%, var(--primary) 120%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ===== 信息条 ===== */
.info-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 28px;
    background: var(--surface-glass);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 20px 26px;
    margin: 24px 0;
    font-size: 0.88rem;
    color: var(--text-light);
    box-shadow: var(--shadow);
    transition: box-shadow var(--transition), border-color var(--transition);
}

.info-bar:hover {
    box-shadow: var(--shadow-md);
    border-color: rgba(224, 90, 43, 0.2);
}

.info-bar span {
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

.info-bar strong {
    color: var(--text);
    font-weight: 600;
}

/* ===== 卡片网格 ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.card {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    position: relative;
    display: flex;
    flex-direction: column;
}

.card::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    pointer-events: none;
    box-shadow: inset 0 0 0 1px transparent;
    transition: box-shadow var(--transition);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(224, 90, 43, 0.25);
}

.card:hover::after {
    box-shadow: inset 0 0 0 1px rgba(224, 90, 43, 0.15);
}

.card-img {
    width: 100%;
    height: 180px;
    background: var(--gradient-mesh), var(--bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    transition: background var(--transition-slow);
}

.card-img::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.card:hover .card-img::before {
    opacity: 0.08;
}

.card-img svg {
    width: 80px;
    height: 80px;
    transition: transform var(--transition-slow);
    position: relative;
    z-index: 1;
}

.card:hover .card-img svg {
    transform: scale(1.12) rotate(-4deg);
}

.card-body {
    padding: 22px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-body h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    margin-top: 0;
    color: var(--text);
    font-weight: 700;
    line-height: 1.4;
}

.card-body h3::before {
    display: none;
}

.card-body p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 14px;
    line-height: 1.7;
    flex: 1;
}

.card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    gap: 8px;
    flex-wrap: wrap;
}

/* 标签 */
.tag {
    display: inline-block;
    background: rgba(224, 90, 43, 0.08);
    border: 1px solid rgba(224, 90, 43, 0.18);
    border-radius: var(--radius-full);
    padding: 3px 12px;
    font-size: 0.75rem;
    color: var(--primary);
    font-weight: 600;
    margin-right: 6px;
    transition: background var(--transition), color var(--transition), transform var(--transition);
    white-space: nowrap;
}

.tag:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-1px);
}

/* ===== FAQ ===== */
.faq-item {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.faq-item:hover {
    border-color: rgba(224, 90, 43, 0.3);
    box-shadow: var(--shadow-sm);
}

.faq-item.open {
    border-color: rgba(224, 90, 43, 0.35);
    box-shadow: var(--shadow);
    background: var(--surface);
}

.faq-question {
    padding: 18px 22px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1rem;
    color: var(--text);
    gap: 16px;
    transition: color var(--transition), background var(--transition);
    user-select: none;
    position: relative;
}

.faq-question:hover {
    color: var(--primary);
    background: rgba(224, 90, 43, 0.03);
}

.faq-question::after {
    content: "＋";
    font-size: 1.3rem;
    color: var(--primary);
    transition: transform var(--transition), color var(--transition);
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(224, 90, 43, 0.08);
    line-height: 1;
    font-weight: 400;
}

.faq-item.open .faq-question::after {
    content: "－";
    transform: rotate(180deg);
    background: var(--primary);
    color: #fff;
}

.faq-item.open .faq-question {
    color: var(--primary);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s;
    padding: 0 22px;
    color: var(--text-light);
    font-size: 0.92rem;
    line-height: 1.8;
    opacity: 0;
}

.faq-item.open .faq-answer {
    max-height: 400px;
    padding: 0 22px 20px;
    opacity: 1;
}

/* ===== HowTo 步骤 ===== */
.howto-steps {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.howto-step {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 26px 22px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    position: relative;
    overflow: hidden;
}

.howto-step::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-slow);
}

.howto-step:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(224, 90, 43, 0.25);
}

.howto-step:hover::before {
    transform: scaleX(1);
}

.howto-step .step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #fff;
    font-weight: 700;
    margin-bottom: 14px;
    font-size: 0.95rem;
    box-shadow: var(--shadow-primary);
    transition: transform var(--transition);
}

.howto-step:hover .step-num {
    transform: scale(1.1) rotate(-6deg);
}

.howto-step h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--text);
    font-weight: 700;
}

.howto-step p {
    font-size: 0.88rem;
    color: var(--text-light);
    margin: 0;
    line-height: 1.7;
}

/* ===== 文章列表 ===== */
.article-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}

.article-item {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 26px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.article-item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-primary);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--transition-slow);
}

.article-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(224, 90, 43, 0.25);
}

.article-item:hover::before {
    transform: scaleY(1);
}

.article-item h3 {
    font-size: 1.05rem;
    margin-bottom: 8px;
    margin-top: 0;
    color: var(--text);
    font-weight: 700;
    line-height: 1.45;
    transition: color var(--transition);
}

.article-item h3::before {
    display: none;
}

.article-item:hover h3 {
    color: var(--primary);
}

.article-item .meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 12px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
}

.article-item p {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.75;
    flex: 1;
}

.read-more {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.88rem;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--transition), color var(--transition);
    align-self: flex-start;
}

.read-more:hover {
    color: var(--primary-dark);
    gap: 8px;
}

/* ===== 引用块 ===== */
blockquote {
    background: var(--surface);
    border-left: 4px solid var(--primary);
    padding: 18px 22px;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin-bottom: 14px;
    color: var(--text-light);
    font-style: italic;
    line-height: 1.75;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    box-shadow: var(--shadow-sm);
}

blockquote:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow);
    border-left-color: var(--secondary);
}

/* ===== 页脚 ===== */
footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 48px 0 24px;
    margin-top: 60px;
    position: relative;
}

footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.footer-col h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--text);
    font-weight: 700;
    position: relative;
    padding-bottom: 10px;
}

.footer-col h4::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 28px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

.footer-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-col li {
    margin-bottom: 10px;
    padding: 0;
}

.footer-col li::before {
    display: none;
}

.footer-col a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 0.88rem;
    transition: color var(--transition), padding-left var(--transition);
    display: inline-block;
    position: relative;
}

.footer-col a:hover {
    color: var(--primary);
    padding-left: 6px;
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    text-align: center;
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.8;
}

.footer-bottom p {
    margin-bottom: 6px;
    color: var(--text-muted);
}

/* ===== 返回顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 1.3rem;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-primary);
    z-index: 999;
    transition: transform var(--transition), opacity var(--transition), box-shadow var(--transition);
    opacity: 0;
}

.back-to-top.show {
    display: flex;
    opacity: 1;
    animation: fadeInUp 0.3s ease;
}

.back-to-top:hover {
    transform: translateY(-4px) scale(1.08);
    box-shadow: 0 12px 32px rgba(224, 90, 43, 0.4);
}

.back-to-top:active {
    transform: translateY(-2px) scale(0.95);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== 滚动动画 ===== */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 响应式设计 ===== */

/* 平板 - 860px */
@media (max-width: 860px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 68px;
        left: 0;
        right: 0;
        background: var(--surface-glass);
        backdrop-filter: blur(20px) saturate(180%);
        -webkit-backdrop-filter: blur(20px) saturate(180%);
        flex-direction: column;
        padding: 20px;
        gap: 6px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        animation: slideDown 0.3s ease;
    }

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

    .nav-links a {
        padding: 12px 16px;
        font-size: 1rem;
        border-radius: var(--radius-sm);
    }

    .nav-links a::before {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .search-box {
        display: none;
    }

    .stats-row {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .banner {
        height: 280px;
        border-radius: var(--radius);
    }

    .banner-content h2 {
        font-size: 1.6rem;
    }

    .banner-content p {
        font-size: 0.95rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    section h1 {
        font-size: 1.6rem;
    }

    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 18px;
    }

    .article-list {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 16px;
    }

    .howto-steps {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 16px;
    }

    .info-bar {
        padding: 16px 20px;
        gap: 10px 20px;
    }

    .info-bar span {
        font-size: 0.84rem;
    }

    .footer-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 24px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 手机 - 480px */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .nav-inner {
        height: 60px;
    }

    .logo {
        font-size: 1.15rem;
    }

    .logo svg {
        width: 30px;
        height: 30px;
    }

    .theme-toggle,
    .mobile-menu-btn {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }

    .nav-links {
        top: 60px;
        padding: 16px;
    }

    .stats-row {
        grid-template-columns: 1fr;
        gap: 12px;
        margin: 28px 0;
    }

    .stat-item {
        padding: 22px 16px;
    }

    .stat-number {
        font-size: 2rem;
    }

    .banner {
        height: 240px;
        margin: 16px 0;
        border-radius: var(--radius);
    }

    .banner-slide {
        padding: 24px 20px;
    }

    .banner-content h2 {
        font-size: 1.3rem;
        margin-bottom: 8px;
    }

    .banner-content p {
        font-size: 0.86rem;
    }

    .banner-dots {
        bottom: 14px;
    }

    .banner-dots span {
        width: 8px;
        height: 8px;
    }

    .banner-dots span.active {
        width: 22px;
    }

    section {
        margin: 40px 0;
    }

    .section-title {
        font-size: 1.3rem;
    }

    .section-title::after {
        width: 36px;
        height: 3px;
    }

    .section-sub {
        font-size: 0.88rem;
        margin-bottom: 24px;
    }

    section h1 {
        font-size: 1.35rem;
        line-height: 1.4;
    }

    section h3 {
        font-size: 1.1rem;
        margin: 22px 0 10px;
    }

    section p {
        font-size: 0.92rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .card-img {
        height: 160px;
    }

    .card-body {
        padding: 18px;
    }

    .article-list {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .article-item {
        padding: 20px;
    }

    .howto-steps {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .howto-step {
        padding: 20px 18px;
    }

    .info-bar {
        flex-direction: column;
        gap: 10px;
        padding: 16px 18px;
        font-size: 0.84rem;
    }

    .info-bar span {
        white-space: normal;
    }

    .faq-question {
        padding: 16px 18px;
        font-size: 0.94rem;
    }

    .faq-answer {
        padding: 0 18px;
        font-size: 0.88rem;
    }

    .faq-item.open .faq-answer {
        padding: 0 18px 18px;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .footer-col h4 {
        font-size: 0.92rem;
    }

    .footer-col a {
        font-size: 0.82rem;
    }

    .footer-bottom {
        font-size: 0.76rem;
    }

    .back-to-top {
        bottom: 16px;
        right: 16px;
        width: 40px;
        height: 40px;
        font-size: 1.1rem;
    }
}

/* 超小屏 - 360px */
@media (max-width: 360px) {
    .container {
        padding: 0 12px;
    }

    .logo span {
        font-size: 1rem;
    }

    .banner-content h2 {
        font-size: 1.15rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ===== 打印样式 ===== */
@media print {
    .navbar,
    .back-to-top,
    .theme-toggle,
    .mobile-menu-btn,
    .search-box,
    .banner-dots {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
        font-size: 12pt;
    }

    .card,
    .article-item,
    .faq-item,
    .howto-step {
        box-shadow: none;
        border: 1px solid #ccc;
        break-inside: avoid;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* ===== 无障碍与减少动画 ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* 焦点可见性 */
:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
    border-radius: 4px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
    outline: 3px solid var(--primary);
    outline-offset: 2px;
}

/* ===== 加载动画 ===== */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

/* ===== 悬停动效增强 ===== */
.card,
.article-item,
.howto-step,
.stat-item,
.faq-item {
    will-change: transform, box-shadow;
}

/* ===== 文本选择 ===== */
::selection {
    background: rgba(224, 90, 43, 0.2);
    color: var(--primary-dark);
}

[data-theme="dark"] ::selection {
    background: rgba(240, 122, 74, 0.3);
    color: var(--text);
}
```