/* ============================================
   LV国际 · 全球品味 — 专属设计系统
   风格：有机纸雕 · 柔和现代主义
   色彩体系：暖米白 + 松石绿 + 干枯玫瑰 + 旧金
   ============================================ */

/* --- 基础重置与全局变量 --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-bg: #f7f3ed;
    --color-bg-alt: #efe8df;
    --color-white: #ffffff;
    --color-primary: #3d6b5e;
    --color-primary-light: #6b9a8c;
    --color-secondary: #c48a7a;
    --color-secondary-light: #e0b8ae;
    --color-accent: #d4a86a;
    --color-accent-light: #e8c99a;
    --color-text: #2d2825;
    --color-text-light: #7a7068;
    --color-border: #e0d8d0;
    --color-border-light: #f0eae4;
    --shadow-sm: 0 2px 8px rgba(45, 40, 37, 0.06);
    --shadow-md: 0 8px 28px rgba(45, 40, 37, 0.08);
    --shadow-lg: 0 16px 48px rgba(45, 40, 37, 0.10);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --font-sans: system-ui, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    overflow-x: hidden;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* --- 有机装饰背景元素 --- */
body::before {
    content: '';
    position: fixed;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(196, 138, 122, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
}

body::after {
    content: '';
    position: fixed;
    bottom: -15%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(61, 107, 94, 0.06) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
    z-index: 0;
}

/* --- 核心布局 --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

.section {
    padding: 100px 0;
    position: relative;
}

.section:nth-child(even) {
    background: var(--color-bg-alt);
}

/* 装饰性角标（用于section） */
.section::after {
    content: '';
    position: absolute;
    right: 40px;
    top: 40px;
    width: 60px;
    height: 60px;
    border-right: 2px solid var(--color-accent-light);
    border-top: 2px solid var(--color-accent-light);
    opacity: 0.4;
    pointer-events: none;
}

/* --- 导航 --- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(247, 243, 237, 0.88);
    backdrop-filter: blur(18px) saturate(1.2);
    border-bottom: 1px solid var(--color-border-light);
    transition: var(--transition);
}

.site-header.scrolled {
    background: rgba(247, 243, 237, 0.96);
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.25rem;
    text-decoration: none;
    color: var(--color-text);
    letter-spacing: 0.5px;
    position: relative;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: #fff;
    font-weight: 600;
    position: relative;
    box-shadow: 0 4px 12px rgba(61, 107, 94, 0.25);
}

.logo-icon::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    border: 1.5px solid var(--color-accent-light);
    opacity: 0.5;
}

.logo span {
    font-weight: 300;
    color: var(--color-text-light);
    font-size: 0.85rem;
    letter-spacing: 1px;
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 32px;
    list-style: none;
}

.main-nav a {
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    transition: var(--transition);
    position: relative;
    padding: 4px 0;
    letter-spacing: 0.3px;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-secondary);
    transition: var(--transition);
    border-radius: 2px;
}

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

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

.nav-cta {
    padding: 10px 24px !important;
    border-radius: 50px !important;
    color: #fff !important;
    font-weight: 600 !important;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    box-shadow: 0 4px 14px rgba(61, 107, 94, 0.25);
    transition: var(--transition) !important;
}

.nav-cta::after {
    display: none !important;
}

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(61, 107, 94, 0.35);
    color: #fff !important;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    background: none;
    border: none;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: var(--transition);
}

/* --- 首页Hero --- */
.hero {
    min-height: 85vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(212, 168, 106, 0.07) 0%, transparent 60%);
    border-radius: 50%;
    pointer-events: none;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    max-width: 100%;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 3px;
    padding: 6px 18px;
    border-radius: 50px;
    background: var(--color-white);
    border: 1px solid var(--color-border);
    color: var(--color-primary);
    margin-bottom: 20px;
    text-transform: uppercase;
}

.hero-eyebrow::before {
    content: '✦';
    font-size: 0.6rem;
    color: var(--color-accent);
}

.hero h1 {
    font-size: 3.4rem;
    line-height: 1.15;
    font-weight: 700;
    letter-spacing: -1px;
    color: var(--color-text);
    margin-bottom: 16px;
}

.hero h1 .accent-word {
    color: var(--color-primary);
    font-style: italic;
    font-weight: 300;
    display: inline-block;
    position: relative;
}

.hero h1 .accent-word::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 0;
    right: 0;
    height: 6px;
    background: var(--color-accent-light);
    opacity: 0.4;
    z-index: -1;
}

.hero p {
    font-size: 1.1rem;
    color: var(--color-text-light);
    max-width: 480px;
    margin-bottom: 36px;
    line-height: 1.7;
}

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

.hero-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: var(--color-bg-alt);
    aspect-ratio: 4/3;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(61, 107, 94, 0.06), rgba(196, 138, 122, 0.06));
    z-index: 1;
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

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

/* 装饰几何块（hero右侧装饰） */
.hero-image::after {
    content: 'LV';
    position: absolute;
    bottom: 20px;
    right: 24px;
    font-size: 4rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.15);
    letter-spacing: 8px;
    z-index: 2;
    pointer-events: none;
}

/* --- 按钮 --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: var(--transition);
    letter-spacing: 0.3px;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    color: #fff;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    box-shadow: 0 4px 16px rgba(61, 107, 94, 0.25);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(61, 107, 94, 0.35);
}

.btn-outline {
    background: transparent;
    border: 1.5px solid var(--color-border);
    color: var(--color-text);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: rgba(61, 107, 94, 0.04);
    transform: translateY(-2px);
}

/* --- 标签/标题 --- */
.section-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--color-secondary);
    margin-bottom: 12px;
}

.section-label::before {
    content: '';
    display: inline-block;
    width: 24px;
    height: 1.5px;
    background: var(--color-secondary-light);
}

.section-title {
    font-size: 2.4rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    color: var(--color-text);
}

.section-desc {
    max-width: 600px;
    color: var(--color-text-light);
    margin-bottom: 48px;
    font-size: 1.05rem;
    line-height: 1.7;
}

/* --- 卡片网格 --- */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
}

.category-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: 32px 28px;
    border: 1px solid var(--color-border-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    opacity: 0;
    transition: var(--transition);
}

.category-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.category-card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    font-size: 1.4rem;
    background: linear-gradient(135deg, rgba(61, 107, 94, 0.08), rgba(196, 138, 122, 0.08));
    color: var(--color-primary);
    transition: var(--transition);
}

.category-card:hover .card-icon {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: #fff;
    box-shadow: 0 4px 14px rgba(61, 107, 94, 0.25);
}

.category-card h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.category-card p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: 16px;
}

.card-link {
    font-weight: 600;
    font-size: 0.85rem;
    text-decoration: none;
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.card-link::after {
    content: '→';
    transition: var(--transition);
}

.card-link:hover {
    color: var(--color-secondary);
}

.card-link:hover::after {
    transform: translateX(4px);
}

/* --- 特性块 --- */
.feature-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.feature-image {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: var(--color-bg-alt);
    aspect-ratio: 4/3;
    position: relative;
}

.feature-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(61, 107, 94, 0.04), transparent 50%);
    pointer-events: none;
}

.feature-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.feature-image:hover img {
    transform: scale(1.03);
}

.feature-text h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 16px;
    line-height: 1.3;
}

.feature-text p {
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 20px;
}

.feature-list {
    list-style: none;
    display: grid;
    gap: 8px;
}

.feature-list li {
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
    border-bottom: 1px solid var(--color-border-light);
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li::before {
    content: '✓';
    font-weight: 700;
    color: var(--color-primary);
    background: rgba(61, 107, 94, 0.1);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 0.75rem;
    flex-shrink: 0;
}

/* --- 数据条 --- */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 32px 20px;
    border-radius: var(--radius-md);
    background: var(--color-white);
    border: 1px solid var(--color-border-light);
    transition: var(--transition);
    position: relative;
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-sm);
}

.stat-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background: var(--color-accent);
    border-radius: 2px;
    opacity: 0.4;
}

.stat-number {
    font-size: 2.6rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1.1;
    margin-bottom: 4px;
    letter-spacing: -1px;
}

.stat-number::after {
    content: '+';
    font-weight: 300;
    color: var(--color-accent);
    font-size: 1.8rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--color-text-light);
    font-weight: 500;
    letter-spacing: 0.5px;
}

/* --- 内容墙 --- */
.content-wall {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 28px;
}

.content-wall-item {
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-white);
    border: 1px solid var(--color-border-light);
    transition: var(--transition);
}

.content-wall-item:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.content-wall-item img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: var(--transition);
}

.content-wall-item:hover img {
    transform: scale(1.04);
}

.content-wall-body {
    padding: 24px;
}

.content-wall-body .meta {
    font-size: 0.75rem;
    color: var(--color-text-light);
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.content-wall-body .meta::before {
    content: '●';
    color: var(--color-accent);
    font-size: 0.4rem;
}

.content-wall-body h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

.content-wall-body p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    line-height: 1.6;
}

/* --- FAQ --- */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
    overflow: hidden;
    cursor: pointer;
    background: var(--color-white);
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--color-border);
}

.faq-item .faq-question {
    padding: 18px 24px;
    font-weight: 600;
    font-size: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
    color: var(--color-text);
}

.faq-item .faq-question::after {
    content: '+';
    font-size: 1.3rem;
    font-weight: 300;
    color: var(--color-accent);
    transition: var(--transition);
}

.faq-item.open .faq-question::after {
    transform: rotate(45deg);
    color: var(--color-primary);
}

.faq-item .faq-answer {
    padding: 0 24px 20px;
    display: none;
    color: var(--color-text-light);
    line-height: 1.7;
    font-size: 0.95rem;
}

.faq-item.open .faq-answer {
    display: block;
    animation: fadeSlideIn 0.35s ease;
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --- CTA横幅 --- */
.cta-banner {
    padding: 72px 40px;
    text-align: center;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--color-primary), #2a5a4e);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.cta-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(212, 168, 106, 0.15) 0%, transparent 60%);
    border-radius: 50%;
    pointer-events: none;
}

.cta-banner::after {
    content: 'LV';
    position: absolute;
    bottom: -20px;
    left: 40px;
    font-size: 10rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.03);
    letter-spacing: 16px;
    pointer-events: none;
}

.cta-banner h2 {
    color: #fff;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}

.cta-banner p {
    color: rgba(255, 255, 255, 0.75);
    max-width: 500px;
    margin: 0 auto 28px;
    font-size: 1.05rem;
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

.cta-banner .btn-primary {
    background: var(--color-white);
    color: var(--color-primary);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    position: relative;
    z-index: 1;
}

.cta-banner .btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* --- 页脚 --- */
.site-footer {
    padding: 72px 0 32px;
    background: var(--color-text);
    color: rgba(255, 255, 255, 0.8);
    position: relative;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent), var(--color-secondary));
    opacity: 0.3;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
}

.footer-brand .logo {
    color: #fff;
    margin-bottom: 16px;
}

.footer-brand .logo-icon {
    background: linear-gradient(135deg, var(--color-accent), var(--color-primary-light));
}

.footer-brand p {
    font-size: 0.9rem;
    opacity: 0.6;
    line-height: 1.7;
    max-width: 320px;
}

.footer-col h4 {
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

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

.footer-col ul a {
    color: rgba(255, 255, 255, 0.55);
    text-decoration: none;
    font-size: 0.85rem;
    transition: var(--transition);
}

.footer-col ul a:hover {
    color: var(--color-accent-light);
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    margin-top: 48px;
    padding-top: 24px;
    text-align: center;
    font-size: 0.8rem;
    opacity: 0.4;
    letter-spacing: 0.5px;
}

/* --- 工具类 --- */
.text-accent {
    color: var(--color-accent);
}

.text-center {
    text-align: center;
}

.seo-description {
    max-width: 600px;
    margin: 0 auto 48px;
    color: var(--color-text-light);
    line-height: 1.7;
    font-size: 1.05rem;
}

.mt-0 {
    margin-top: 0;
}

.mb-0 {
    margin-bottom: 0;
}

/* --- 滚动条美化 --- */
::-webkit-scrollbar {
    width: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-light);
}

/* --- 选择器样式 --- */
::selection {
    background: var(--color-primary);
    color: #fff;
}

/* --- 响应式 --- */
@media (max-width: 1024px) {
    .hero .container {
        gap: 40px;
    }

    .hero h1 {
        font-size: 2.8rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

@media (max-width: 768px) {
    .hero {
        min-height: auto;
        padding: 100px 0 60px;
    }

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

    .hero-content {
        order: 1;
    }

    .hero-image {
        order: 0;
        aspect-ratio: 16/10;
    }

    .hero h1 {
        font-size: 2.2rem;
    }

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

    .feature-block {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

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

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

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .main-nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(247, 243, 237, 0.98);
        backdrop-filter: blur(18px);
        padding: 24px 32px;
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
        border-bottom: 1px solid var(--color-border-light);
        box-shadow: var(--shadow-md);
    }

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

    .menu-toggle {
        display: flex;
    }

    .section {
        padding: 60px 0;
    }

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

    .cards-grid,
    .content-wall {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .cta-banner {
        padding: 48px 24px;
    }

    .cta-banner h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .cards-grid,
    .content-wall,
    .stats-bar {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

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

    .hero-buttons .btn {
        width: 100%;
        justify-content: center;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero-image {
        aspect-ratio: 4/3;
    }

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

    .header-inner {
        height: 64px;
    }

    .logo {
        font-size: 1.1rem;
    }

    .logo-icon {
        width: 34px;
        height: 34px;
        font-size: 0.9rem;
    }

    .main-nav {
        top: 64px;
    }

    .stat-number {
        font-size: 1.8rem;
    }

    .cta-banner {
        padding: 40px 20px;
        border-radius: var(--radius-md);
    }

    .cta-banner h2 {
        font-size: 1.3rem;
    }

    .feature-block {
        gap: 28px;
    }

    .category-card {
        padding: 24px 20px;
    }
}

/* --- 动画增强 --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content,
.category-card,
.content-wall-item,
.stat-item,
.feature-block > * {
    animation: fadeInUp 0.6s ease forwards;
}

.category-card:nth-child(2) { animation-delay: 0.1s; }
.category-card:nth-child(3) { animation-delay: 0.2s; }
.category-card:nth-child(4) { animation-delay: 0.3s; }

.content-wall-item:nth-child(2) { animation-delay: 0.1s; }
.content-wall-item:nth-child(3) { animation-delay: 0.2s; }