:root {
    --brand-primary: #0a1e3c;
    --brand-secondary: #e63946;
    --brand-accent: #f4a261;
    --brand-light: #f8f9fa;
    --brand-dark: #1d3557;
    --text-main: #212529;
    --text-muted: #6c757d;
    --bg-body: #ffffff;
    --bg-card: #f8f9fa;
    --border-color: #dee2e6;
    --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 12px 40px rgba(0, 0, 0, 0.18);
    --radius: 8px;
    --radius-lg: 16px;
    --transition: 0.3s ease;
    --glass-bg: rgba(255, 255, 255, 0.12);
    --glass-border: rgba(255, 255, 255, 0.18);
    --gradient-hero: linear-gradient(135deg, #0a1e3c 0%, #1d3557 45%, #2a4a7f 100%);
    --gradient-accent: linear-gradient(135deg, #e63946 0%, #f4a261 100%);
    --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.9), rgba(248, 249, 250, 0.7));
}

body.dark-mode {
    --brand-primary: #1a2a44;
    --brand-secondary: #ff6b6b;
    --brand-accent: #ffd166;
    --brand-light: #1e1e2f;
    --brand-dark: #0f0f1a;
    --text-main: #e9ecef;
    --text-muted: #adb5bd;
    --bg-body: #12121c;
    --bg-card: #1e1e2f;
    --border-color: #2c2c3e;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
    --glass-bg: rgba(255, 255, 255, 0.06);
    --glass-border: rgba(255, 255, 255, 0.1);
    --gradient-hero: linear-gradient(135deg, #0f0f1a 0%, #1a2a44 45%, #2a3a5f 100%);
    --gradient-card: linear-gradient(145deg, rgba(30, 30, 47, 0.9), rgba(18, 18, 28, 0.7));
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.8;
    color: var(--text-main);
    background-color: var(--bg-body);
    transition: background-color var(--transition), color var(--transition);
    font-size: 16px;
    overflow-x: hidden;
}

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

a:hover {
    color: var(--brand-accent);
}

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

ul,
ol {
    list-style: none;
}

button {
    font-family: inherit;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* 导航栏 */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--gradient-hero);
    color: #fff;
    box-shadow: var(--shadow-sm);
    transition: background var(--transition), box-shadow var(--transition);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}

.logo svg {
    width: 40px;
    height: 40px;
    transition: transform var(--transition);
}

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

.logo span {
    background: linear-gradient(135deg, #ffffff 0%, #f4a261 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 24px;
    align-items: center;
}

.nav-links a {
    color: #f0f0f0;
    font-weight: 500;
    padding: 6px 0;
    position: relative;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition), color var(--transition);
}

.nav-links a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    transition: width var(--transition);
    border-radius: 2px;
}

.nav-links a:hover {
    color: var(--brand-accent);
}

.nav-links a:hover::after {
    width: 100%;
}

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

.search-box {
    display: flex;
    align-items: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 4px 14px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.search-box:focus-within {
    background: rgba(255, 255, 255, 0.22);
    border-color: var(--brand-accent);
    box-shadow: 0 0 0 3px rgba(244, 162, 97, 0.2);
}

.search-box input {
    background: transparent;
    border: none;
    color: #fff;
    padding: 6px 8px;
    outline: none;
    width: 140px;
    font-size: 0.9rem;
}

.search-box input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.search-box button {
    background: transparent;
    border: none;
    color: #fff;
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    transition: color var(--transition), transform var(--transition);
}

.search-box button:hover {
    color: var(--brand-accent);
    transform: scale(1.1);
}

.theme-toggle,
.menu-toggle {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: #fff;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition), transform var(--transition), border-color var(--transition);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    flex-shrink: 0;
}

.theme-toggle:hover,
.menu-toggle:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
    border-color: var(--brand-accent);
}

.menu-toggle {
    display: none;
}

/* 面包屑 */
.breadcrumb {
    padding: 14px 0;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.breadcrumb ol {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
}

.breadcrumb li {
    display: flex;
    align-items: center;
}

.breadcrumb li:not(:last-child)::after {
    content: "›";
    margin-left: 6px;
    color: var(--text-muted);
    font-size: 1.1rem;
}

.breadcrumb a {
    color: var(--brand-secondary);
    transition: color var(--transition);
}

.breadcrumb a:hover {
    color: var(--brand-accent);
}

/* 首屏 Hero */
.hero {
    background: var(--gradient-hero);
    color: #fff;
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: -50%;
    right: -20%;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(244, 162, 97, 0.18) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: floatGlow 8s ease-in-out infinite;
}

.hero::after {
    content: "";
    position: absolute;
    bottom: -40%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(230, 57, 70, 0.15) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    animation: floatGlow 10s ease-in-out infinite reverse;
}

@keyframes floatGlow {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    50% {
        transform: translate(30px, -30px) scale(1.1);
    }
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 2.6rem;
    line-height: 1.3;
    margin-bottom: 20px;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.hero-content h1 span {
    background: linear-gradient(135deg, #f4a261 0%, #ffd166 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-content p {
    font-size: 1.08rem;
    margin-bottom: 28px;
    opacity: 0.95;
    line-height: 1.9;
}

.hero-cta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 13px 30px;
    border-radius: 30px;
    font-weight: 600;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-accent);
    color: #fff;
    box-shadow: 0 4px 15px rgba(230, 57, 70, 0.35);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(230, 57, 70, 0.5);
    color: #fff;
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255, 255, 255, 0.7);
}

.btn-outline:hover {
    background: #fff;
    color: var(--brand-primary);
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(255, 255, 255, 0.25);
    border-color: #fff;
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-visual svg {
    width: 100%;
    max-width: 440px;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.35));
    animation: heroFloat 6s ease-in-out infinite;
}

@keyframes heroFloat {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-14px);
    }
}

/* Banner轮播 */
.banner-carousel {
    background: linear-gradient(90deg, #0f0f1a 0%, #1d3557 50%, #0f0f1a 100%);
    padding: 16px 0;
    color: #fff;
    overflow: hidden;
    position: relative;
}

.banner-carousel::before,
.banner-carousel::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    width: 60px;
    z-index: 2;
    pointer-events: none;
}

.banner-carousel::before {
    left: 0;
    background: linear-gradient(90deg, #0f0f1a, transparent);
}

.banner-carousel::after {
    right: 0;
    background: linear-gradient(270deg, #0f0f1a, transparent);
}

.carousel-track {
    display: flex;
    transition: transform 0.6s cubic-bezier(0.65, 0, 0.35, 1);
}

.carousel-slide {
    min-width: 100%;
    text-align: center;
    padding: 8px 20px;
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    opacity: 0.95;
}

.carousel-slide svg {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.7;
        transform: scale(1.15);
    }
}

/* 章节通用 */
section {
    padding: 70px 0;
    position: relative;
}

section:nth-child(even) {
    background: var(--bg-card);
    transition: background var(--transition);
}

.section-title {
    text-align: center;
    margin-bottom: 48px;
}

.section-title h2 {
    font-size: 2rem;
    color: var(--brand-primary);
    margin-bottom: 12px;
    position: relative;
    display: inline-block;
    font-weight: 800;
    letter-spacing: -0.3px;
}

body.dark-mode .section-title h2 {
    color: var(--brand-accent);
}

.section-title h2::after {
    content: "";
    display: block;
    width: 64px;
    height: 4px;
    background: var(--gradient-accent);
    margin: 12px auto 0;
    border-radius: 2px;
}

.section-title p {
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto;
    font-size: 1rem;
}

/* 品牌介绍 */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-text h3 {
    font-size: 1.5rem;
    color: var(--brand-primary);
    margin-bottom: 16px;
    margin-top: 20px;
    font-weight: 700;
}

.about-text h3:first-child {
    margin-top: 0;
}

body.dark-mode .about-text h3 {
    color: var(--brand-accent);
}

.about-text p {
    margin-bottom: 16px;
    color: var(--text-main);
    line-height: 1.9;
}

.about-visual {
    position: relative;
}

.about-visual::before {
    content: "";
    position: absolute;
    inset: -12px;
    background: var(--gradient-accent);
    border-radius: var(--radius-lg);
    opacity: 0.15;
    filter: blur(24px);
    z-index: -1;
}

.about-visual svg {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition);
}

.about-visual:hover svg {
    transform: scale(1.02) rotate(0.5deg);
}

/* 产品优势卡片 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-body);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px 26px;
    text-align: center;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition);
}

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

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-card svg {
    width: 56px;
    height: 56px;
    margin: 0 auto 18px;
    transition: transform var(--transition);
}

.feature-card:hover svg {
    transform: scale(1.15) rotate(-5deg);
}

.feature-card h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--brand-primary);
    font-weight: 700;
}

body.dark-mode .feature-card h3 {
    color: var(--brand-accent);
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* 数字统计 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 32px 24px;
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.stat-item:hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow: var(--shadow-md);
}

.stat-number {
    font-size: 2.4rem;
    font-weight: 800;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: block;
    line-height: 1.2;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 8px;
}

/* 解决方案 */
.solution-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.solution-card {
    background: var(--bg-body);
    border-left: 4px solid var(--brand-secondary);
    border-radius: var(--radius);
    padding: 26px;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
    position: relative;
}

.solution-card::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    background: var(--gradient-accent);
    opacity: 0;
    transition: opacity var(--transition);
    z-index: -1;
}

.solution-card:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
    border-left-color: var(--brand-accent);
}

.solution-card h3 {
    font-size: 1.15rem;
    margin-bottom: 10px;
    color: var(--brand-primary);
    font-weight: 700;
}

body.dark-mode .solution-card h3 {
    color: var(--brand-accent);
}

.solution-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* 文章列表 */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.article-card {
    background: var(--bg-body);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
}

.article-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.article-thumb {
    height: 170px;
    background: var(--gradient-hero);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.article-thumb::after {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 70% 30%, rgba(244, 162, 97, 0.25), transparent 60%);
    opacity: 0;
    transition: opacity var(--transition);
}

.article-card:hover .article-thumb::after {
    opacity: 1;
}

.article-thumb svg {
    width: 64px;
    height: 64px;
    opacity: 0.9;
    transition: transform var(--transition);
    position: relative;
    z-index: 1;
}

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

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

.article-meta {
    display: flex;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    align-items: center;
}

.article-meta span {
    background: var(--bg-card);
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
    border: 1px solid var(--border-color);
}

.article-body h3 {
    font-size: 1.08rem;
    margin-bottom: 10px;
    color: var(--brand-primary);
    line-height: 1.5;
    font-weight: 700;
    transition: color var(--transition);
}

body.dark-mode .article-body h3 {
    color: var(--brand-accent);
}

.article-card:hover .article-body h3 {
    color: var(--brand-secondary);
}

.article-body p {
    color: var(--text-muted);
    font-size: 0.9rem;
    flex: 1;
    margin-bottom: 16px;
    line-height: 1.8;
}

.read-more {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--brand-secondary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--transition), color var(--transition);
}

.read-more:hover {
    gap: 10px;
    color: var(--brand-accent);
}

/* FAQ */
.faq-list {
    max-width: 860px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg-body);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    transition: box-shadow var(--transition), border-color var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow-sm);
}

.faq-item.active {
    border-color: var(--brand-secondary);
    box-shadow: var(--shadow-md);
}

.faq-question {
    padding: 20px 24px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--brand-primary);
    transition: background var(--transition), color var(--transition);
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    font-size: 1rem;
    font-family: inherit;
    gap: 12px;
}

body.dark-mode .faq-question {
    color: var(--brand-accent);
}

.faq-question:hover {
    background: var(--bg-card);
}

.faq-question svg {
    width: 20px;
    height: 20px;
    transition: transform var(--transition);
    flex-shrink: 0;
    color: var(--brand-secondary);
}

.faq-item.active .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1), padding var(--transition);
    padding: 0 24px;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.9;
}

.faq-item.active .faq-answer {
    max-height: 800px;
    padding: 0 24px 22px;
}

/* HowTo */
.howto-steps {
    max-width: 860px;
    margin: 0 auto;
    counter-reset: step;
}

.howto-step {
    background: var(--bg-body);
    border-radius: var(--radius-lg);
    padding: 26px 26px 26px 76px;
    margin-bottom: 18px;
    position: relative;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: transform var(--transition), box-shadow var(--transition);
}

.howto-step:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-md);
}

.howto-step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 22px;
    top: 26px;
    width: 38px;
    height: 38px;
    background: var(--gradient-accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    box-shadow: 0 4px 12px rgba(230, 57, 70, 0.35);
}

.howto-step h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--brand-primary);
    font-weight: 700;
}

body.dark-mode .howto-step h3 {
    color: var(--brand-accent);
}

.howto-step p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.85;
}

/* 客户评价 */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.testimonial-card {
    background: var(--bg-body);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    box-shadow: var(--shadow-sm);
    position: relative;
    border: 1px solid var(--border-color);
    transition: transform var(--transition), box-shadow var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.testimonial-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.testimonial-card::before {
    content: "\201C";
    position: absolute;
    top: 10px;
    left: 22px;
    font-size: 4.5rem;
    color: var(--brand-secondary);
    opacity: 0.18;
    line-height: 1;
    font-family: Georgia, serif;
}

.testimonial-text {
    font-style: italic;
    margin-bottom: 20px;
    color: var(--text-main);
    font-size: 0.95rem;
    line-height: 1.9;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 14px;
}

.author-avatar {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(230, 57, 70, 0.3);
}

.author-info strong {
    display: block;
    color: var(--brand-primary);
    font-size: 0.95rem;
}

body.dark-mode .author-info strong {
    color: var(--brand-accent);
}

.author-info span {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* 联系我们 */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}

.contact-info h3 {
    font-size: 1.3rem;
    margin-bottom: 18px;
    color: var(--brand-primary);
    font-weight: 700;
}

body.dark-mode .contact-info h3 {
    color: var(--brand-accent);
}

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

.contact-list li {
    display: flex;
    gap: 14px;
    margin-bottom: 16px;
    align-items: flex-start;
    color: var(--text-muted);
    font-size: 0.95rem;
    transition: transform var(--transition), color var(--transition);
}

.contact-list li:hover {
    transform: translateX(4px);
    color: var(--text-main);
}

.contact-list svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    margin-top: 4px;
}

.contact-form {
    background: var(--gradient-card);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: box-shadow var(--transition);
}

.contact-form:hover {
    box-shadow: var(--shadow-lg);
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-main);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-body);
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--brand-secondary);
    box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.15);
}

.form-group textarea {
    resize: vertical;
    min-height: 110px;
}

/* 页脚 */
footer {
    background: var(--gradient-hero);
    color: #e0e0e0;
    padding: 56px 0 24px;
    position: relative;
    overflow: hidden;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 36px;
    margin-bottom: 36px;
}

.footer-col h4 {
    color: #fff;
    margin-bottom: 18px;
    font-size: 1.05rem;
    font-weight: 700;
    position: relative;
    padding-bottom: 10px;
}

.footer-col h4::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 30px;
    height: 2px;
    background: var(--gradient-accent);
    border-radius: 2px;
}

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

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

.footer-col a {
    color: #c0c0c0;
    font-size: 0.9rem;
    transition: color var(--transition), padding-left var(--transition);
    display: inline-block;
}

.footer-col a:hover {
    color: var(--brand-accent);
    padding-left: 5px;
}

.footer-col p {
    font-size: 0.9rem;
    color: #c0c0c0;
    line-height: 1.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 22px;
    text-align: center;
    font-size: 0.85rem;
    color: #a0a0a0;
    line-height: 1.8;
}

.footer-bottom a {
    color: #c0c0c0;
    transition: color var(--transition);
}

.footer-bottom a:hover {
    color: var(--brand-accent);
}

/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--gradient-accent);
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6px 20px rgba(230, 57, 70, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px) scale(1.08);
    box-shadow: 0 12px 30px rgba(230, 57, 70, 0.55);
}

/* 滚动动画 */
.fade-in {
    opacity: 0;
    transform: translateY(36px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式 */
@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 2.1rem;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-visual {
        order: -1;
    }

    .hero-visual svg {
        max-width: 320px;
    }

    .about-grid,
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 0;
        padding: 16px 0;
        order: 3;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        margin-top: 8px;
    }

    .nav-links.active {
        display: flex;
        animation: slideDown 0.35s ease;
    }

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

    .nav-links a {
        padding: 12px 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        width: 100%;
        text-align: center;
        font-size: 1rem;
    }

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

    .menu-toggle {
        display: flex;
    }
}

@media (max-width: 768px) {
    section {
        padding: 50px 0;
    }

    .section-title {
        margin-bottom: 36px;
    }

    .section-title h2 {
        font-size: 1.6rem;
    }

    .hero {
        padding: 56px 0;
    }

    .hero-content h1 {
        font-size: 1.75rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

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

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

    .howto-step {
        padding: 22px 20px 22px 68px;
    }

    .howto-step::before {
        left: 18px;
        top: 22px;
        width: 34px;
        height: 34px;
        font-size: 0.9rem;
    }

    .contact-form {
        padding: 24px;
    }

    .footer-grid {
        gap: 28px;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 0 16px;
    }

    .hero-content h1 {
        font-size: 1.5rem;
    }

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

    .btn {
        padding: 11px 24px;
        font-size: 0.95rem;
        width: 100%;
    }

    .hero-cta {
        flex-direction: column;
        width: 100%;
    }

    .section-title h2 {
        font-size: 1.4rem;
    }

    .section-title p {
        font-size: 0.9rem;
    }

    .search-box {
        display: none;
    }

    .stat-number {
        font-size: 1.7rem;
    }

    .stat-item {
        padding: 24px 16px;
    }

    .carousel-slide {
        font-size: 0.85rem;
        padding: 8px 16px;
    }

    .carousel-slide svg {
        width: 20px;
        height: 20px;
    }

    .feature-card {
        padding: 26px 20px;
    }

    .article-thumb {
        height: 150px;
    }

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

    .faq-question {
        padding: 16px 18px;
        font-size: 0.95rem;
    }

    .faq-answer {
        padding: 0 18px;
        font-size: 0.9rem;
    }

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

    .testimonial-card {
        padding: 26px 22px;
    }

    .contact-form {
        padding: 20px;
    }

    .howto-step {
        padding: 20px 18px 20px 62px;
        border-radius: var(--radius);
    }

    .howto-step::before {
        left: 16px;
        top: 20px;
        width: 32px;
        height: 32px;
        font-size: 0.85rem;
    }
}

@media (max-width: 400px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .hero-content h1 {
        font-size: 1.35rem;
    }

    .logo span {
        font-size: 1.15rem;
    }

    .logo svg {
        width: 34px;
        height: 34px;
    }
}

@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;
    }

    .fade-in {
        opacity: 1;
        transform: none;
    }
}

@media print {
    .navbar,
    .banner-carousel,
    .back-to-top,
    .hero-cta,
    .contact-form {
        display: none;
    }

    body {
        background: #fff;
        color: #000;
    }

    section {
        padding: 20px 0;
        page-break-inside: avoid;
    }
}