/* ============================================
   问鼎H5在线 | 独特视觉设计系统
   风格：暖阳层叠 · 立体卡片 · 渐变韵律
   配色：珊瑚橙 + 深海蓝 + 象牙白
   ============================================ */

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

body { 
    font-family: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif; 
    overflow-x: hidden; 
    background: #fef8f4; 
    color: #2d2a28; 
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: #ff8a5c;
    color: #fff;
}

/* 页面滚动条 */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #f5ede8;
}
::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #ff8a5c, #ffb07c);
    border-radius: 4px;
}

/* ========== 核心布局 ========== */
.container { 
    max-width: 1200px; 
    margin: 0 auto; 
    padding: 0 28px; 
}

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

.section:nth-child(even) { 
    background: linear-gradient(135deg, #faf0ea 0%, #f5e8e0 100%); 
}

/* 装饰性背景元素 */
.section::before {
    content: '';
    position: absolute;
    top: -80px;
    right: -80px;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,138,92,0.08) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.section:nth-child(even)::before {
    background: radial-gradient(circle, rgba(0,180,216,0.08) 0%, transparent 70%);
    top: auto;
    bottom: -60px;
    right: auto;
    left: -60px;
}

/* ========== 导航栏 — 暖白磨砂玻璃 ========== */
.site-header { 
    position: fixed; 
    top: 0; 
    left: 0; 
    width: 100%; 
    z-index: 1000; 
    background: rgba(255, 248, 244, 0.88); 
    backdrop-filter: blur(18px) saturate(1.2); 
    border-bottom: 1px solid rgba(255, 138, 92, 0.15); 
    box-shadow: 0 2px 30px rgba(255, 138, 92, 0.06);
    transition: all 0.3s ease;
}

.site-header.scrolled {
    background: rgba(255, 248, 244, 0.96);
    box-shadow: 0 4px 40px rgba(255, 138, 92, 0.10);
}

.header-inner { 
    display: flex; 
    align-items: center; 
    justify-content: space-between; 
    height: 72px; 
    max-width: 1200px; 
    margin: 0 auto; 
    padding: 0 28px; 
}

.logo { 
    display: flex; 
    align-items: center; 
    gap: 10px; 
    font-weight: 800; 
    font-size: 1.3rem; 
    text-decoration: none; 
    color: #2d2a28; 
    letter-spacing: -0.5px;
}

.logo-icon { 
    width: 40px; 
    height: 40px; 
    border-radius: 12px; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    font-size: 1.2rem; 
    background: linear-gradient(135deg, #ff8a5c, #ffb07c);
    color: #fff;
    box-shadow: 0 4px 12px rgba(255, 138, 92, 0.3);
    transform: rotate(0deg);
    transition: transform 0.4s ease;
}

.logo:hover .logo-icon {
    transform: rotate(8deg) scale(1.05);
}

.logo span span {
    color: #ff8a5c;
}

.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; 
    transition: all 0.25s ease; 
    color: #4a4542;
    position: relative;
    padding: 4px 0;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #ff8a5c, #ffb07c);
    transition: all 0.3s ease;
    transform: translateX(-50%);
    border-radius: 2px;
}

.main-nav a:hover {
    color: #ff8a5c;
}

.main-nav a:hover::after {
    width: 70%;
}

.nav-cta { 
    padding: 10px 24px; 
    border-radius: 50px; 
    color: #fff !important; 
    font-weight: 600; 
    background: linear-gradient(135deg, #ff8a5c, #ffb07c);
    box-shadow: 0 4px 16px rgba(255, 138, 92, 0.25);
    transition: all 0.3s ease;
    letter-spacing: 0.3px;
}

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

.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(255, 138, 92, 0.35);
    color: #fff !important;
}

.menu-toggle { 
    display: none; 
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
    padding: 4px;
    border: none;
    background: none;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2.5px;
    background: #2d2a28;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== Hero 区域 — 层叠立体感 ========== */
.hero { 
    min-height: 85vh; 
    display: flex; 
    align-items: center; 
    padding-top: 72px;
    position: relative;
    background: linear-gradient(160deg, #fef8f4 0%, #f8ede6 40%, #fef8f4 100%);
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 120px;
    background: linear-gradient(to top, #fef8f4, transparent);
    z-index: 1;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
}

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

.hero-eyebrow { 
    display: inline-block; 
    font-size: 0.8rem; 
    font-weight: 700; 
    padding: 6px 18px; 
    border-radius: 50px; 
    margin-bottom: 20px; 
    background: linear-gradient(135deg, rgba(255,138,92,0.12), rgba(255,176,124,0.12));
    color: #ff7a3d;
    letter-spacing: 1px;
    text-transform: uppercase;
    border: 1px solid rgba(255,138,92,0.2);
}

.hero h1 { 
    font-size: 3.2rem; 
    line-height: 1.15; 
    margin-bottom: 20px; 
    font-weight: 800;
    letter-spacing: -1px;
    color: #2d2a28;
}

.hero h1 .highlight {
    background: linear-gradient(135deg, #ff8a5c, #ffb07c);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p { 
    font-size: 1.15rem; 
    opacity: 0.7; 
    max-width: 520px; 
    margin-bottom: 36px; 
    color: #5a5550;
    line-height: 1.7;
}

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

.hero-image { 
    border-radius: 20px; 
    overflow: hidden; 
    box-shadow: 
        0 20px 60px rgba(255, 138, 92, 0.15),
        0 8px 24px rgba(0, 0, 0, 0.04);
    transform: perspective(800px) rotateY(-2deg) rotateX(2deg);
    transition: transform 0.6s ease;
    background: linear-gradient(135deg, #ffb07c, #ff8a5c);
    padding: 4px;
}

.hero-image:hover {
    transform: perspective(800px) rotateY(0deg) rotateX(0deg);
}

.hero-image img { 
    width: 100%; 
    height: auto; 
    display: block;
    border-radius: 16px;
}

/* 装饰浮动元素 */
.hero-deco {
    position: absolute;
    border-radius: 50%;
    pointer-events: none;
}

.hero-deco-1 {
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(255,138,92,0.12), transparent);
    top: -40px;
    right: 10%;
}

.hero-deco-2 {
    width: 120px;
    height: 120px;
    background: radial-gradient(circle, rgba(0,180,216,0.08), transparent);
    bottom: 20%;
    left: 5%;
}

/* ========== 按钮 ========== */
.btn { 
    display: inline-flex; 
    align-items: center; 
    gap: 10px; 
    padding: 14px 32px; 
    border-radius: 50px; 
    font-weight: 600; 
    cursor: pointer; 
    border: none; 
    text-decoration: none; 
    transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94); 
    font-size: 0.95rem;
    letter-spacing: 0.3px;
}

.btn-primary { 
    color: #fff; 
    background: linear-gradient(135deg, #ff8a5c, #ffb07c);
    box-shadow: 0 6px 24px rgba(255, 138, 92, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 36px rgba(255, 138, 92, 0.4);
}

.btn-outline { 
    background: transparent; 
    border: 2px solid #ff8a5c; 
    color: #ff7a3d;
}

.btn-outline:hover {
    background: rgba(255, 138, 92, 0.06);
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(255, 138, 92, 0.12);
}

.btn .arrow {
    display: inline-block;
    transition: transform 0.3s ease;
}

.btn:hover .arrow {
    transform: translateX(4px);
}

/* ========== 标签/标题 ========== */
.section-label { 
    display: inline-block; 
    font-size: 0.75rem; 
    font-weight: 700; 
    letter-spacing: 2.5px; 
    margin-bottom: 12px; 
    color: #ff8a5c;
    text-transform: uppercase;
    background: rgba(255,138,92,0.08);
    padding: 4px 16px;
    border-radius: 50px;
    border: 1px solid rgba(255,138,92,0.12);
}

.section-title { 
    font-size: 2.4rem; 
    margin-bottom: 16px; 
    font-weight: 800;
    letter-spacing: -0.5px;
    color: #2d2a28;
    line-height: 1.2;
}

.section-title .accent-text {
    background: linear-gradient(135deg, #ff8a5c, #ffb07c);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc { 
    max-width: 600px; 
    opacity: 0.7; 
    margin-bottom: 44px; 
    color: #5a5550;
    font-size: 1.05rem;
    line-height: 1.7;
}

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

.category-card { 
    border-radius: 20px; 
    padding: 32px 28px; 
    border: 1px solid rgba(255, 138, 92, 0.08); 
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94); 
    background: #fff;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #ff8a5c, #ffb07c, #ffd4a8);
    opacity: 0;
    transition: opacity 0.4s ease;
}

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

.category-card:hover { 
    transform: translateY(-6px); 
    box-shadow: 
        0 20px 50px rgba(255, 138, 92, 0.12),
        0 8px 24px rgba(0, 0, 0, 0.04);
    border-color: rgba(255, 138, 92, 0.15);
}

.card-icon { 
    width: 52px; 
    height: 52px; 
    border-radius: 16px; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    margin-bottom: 20px; 
    font-size: 1.4rem; 
    background: linear-gradient(135deg, rgba(255,138,92,0.12), rgba(255,176,124,0.10));
    color: #ff8a5c;
    transition: all 0.3s ease;
}

.category-card:hover .card-icon {
    background: linear-gradient(135deg, #ff8a5c, #ffb07c);
    color: #fff;
    transform: scale(1.05) rotate(2deg);
}

.category-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: #2d2a28;
}

.category-card p {
    font-size: 0.9rem;
    opacity: 0.65;
    margin-bottom: 16px;
    color: #5a5550;
    line-height: 1.6;
}

.card-link { 
    font-weight: 600; 
    font-size: 0.85rem; 
    text-decoration: none; 
    color: #ff8a5c;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.3s ease;
}

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

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

.feature-block.reverse {
    direction: rtl;
}

.feature-block.reverse > * {
    direction: ltr;
}

.feature-image { 
    border-radius: 20px; 
    overflow: hidden; 
    box-shadow: 
        0 20px 60px rgba(255, 138, 92, 0.10),
        0 8px 24px rgba(0, 0, 0, 0.03);
    position: relative;
    background: linear-gradient(135deg, #ffb07c, #ff8a5c);
    padding: 4px;
}

.feature-image::after {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, rgba(255,138,92,0.08), transparent);
    border-radius: 50%;
    pointer-events: none;
}

.feature-image img { 
    width: 100%; 
    height: auto; 
    display: block;
    border-radius: 16px;
}

.feature-text { 
    padding: 20px 0;
}

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

.feature-list { 
    list-style: none; 
    margin-top: 20px;
}

.feature-list li { 
    padding: 10px 0; 
    display: flex; 
    align-items: center; 
    gap: 12px; 
    font-size: 1rem;
    color: #4a4542;
    border-bottom: 1px solid rgba(0,0,0,0.04);
}

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

.feature-list li::before { 
    content: '✦'; 
    font-weight: 700; 
    color: #ff8a5c;
    font-size: 1.1rem;
}

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

.stat-item { 
    padding: 32px 20px; 
    border-radius: 20px; 
    border: 1px solid rgba(255, 138, 92, 0.08); 
    background: #fff;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #ff8a5c, #ffb07c);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.stat-item:hover::before {
    opacity: 1;
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(255, 138, 92, 0.12);
}

.stat-number { 
    font-size: 2.6rem; 
    font-weight: 800; 
    background: linear-gradient(135deg, #ff8a5c, #ffb07c);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
    margin-bottom: 4px;
}

.stat-label { 
    font-size: 0.9rem; 
    opacity: 0.6; 
    margin-top: 6px; 
    color: #5a5550;
    font-weight: 500;
}

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

.content-wall-item { 
    border-radius: 20px; 
    overflow: hidden; 
    border: 1px solid rgba(255, 138, 92, 0.08); 
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94); 
    background: #fff;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
}

.content-wall-item:hover { 
    transform: translateY(-6px); 
    box-shadow: 
        0 20px 50px rgba(255, 138, 92, 0.12),
        0 8px 24px rgba(0, 0, 0, 0.04);
    border-color: rgba(255, 138, 92, 0.15);
}

.content-wall-item img { 
    width: 100%; 
    height: 220px; 
    object-fit: cover; 
    transition: transform 0.6s ease;
}

.content-wall-item:hover img {
    transform: scale(1.03);
}

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

.content-wall-body h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: #2d2a28;
}

.content-wall-body p {
    font-size: 0.9rem;
    opacity: 0.65;
    color: #5a5550;
    line-height: 1.6;
}

.content-wall-body .tag {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 3px 12px;
    border-radius: 50px;
    background: rgba(255,138,92,0.08);
    color: #ff8a5c;
    margin-top: 10px;
    letter-spacing: 0.5px;
}

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

.faq-item { 
    border: 1px solid rgba(255, 138, 92, 0.10); 
    border-radius: 16px; 
    margin-bottom: 12px; 
    overflow: hidden; 
    cursor: pointer; 
    background: #fff;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.02);
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: rgba(255, 138, 92, 0.20);
    box-shadow: 0 4px 20px rgba(255, 138, 92, 0.06);
}

.faq-item .faq-question { 
    padding: 20px 24px; 
    font-weight: 600; 
    display: flex; 
    justify-content: space-between; 
    align-items: center;
    color: #2d2a28;
    font-size: 1rem;
}

.faq-item .faq-question .icon {
    font-size: 1.2rem;
    color: #ff8a5c;
    transition: transform 0.3s ease;
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-item.open .faq-question .icon {
    transform: rotate(45deg);
}

.faq-item .faq-answer { 
    padding: 0 24px 20px; 
    display: none; 
    opacity: 0.7; 
    color: #5a5550;
    line-height: 1.7;
}

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

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 0.7;
        transform: translateY(0);
    }
}

/* ========== CTA横幅 ========== */
.cta-banner { 
    padding: 64px 32px; 
    text-align: center; 
    border-radius: 24px; 
    background: linear-gradient(135deg, #ff8a5c, #ff6b3d, #ffb07c);
    box-shadow: 
        0 20px 60px rgba(255, 138, 92, 0.25),
        0 8px 24px rgba(255, 138, 92, 0.10);
    position: relative;
    overflow: hidden;
    color: #fff;
}

.cta-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255,255,255,0.10), transparent);
    border-radius: 50%;
    pointer-events: none;
}

.cta-banner::after {
    content: '';
    position: absolute;
    bottom: -40%;
    left: -20%;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(255,255,255,0.06), transparent);
    border-radius: 50%;
    pointer-events: none;
}

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

.cta-banner p {
    color: rgba(255,255,255,0.85);
    margin-bottom: 28px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    font-size: 1.05rem;
    position: relative;
    z-index: 1;
}

.cta-banner .btn-primary { 
    background: #fff; 
    color: #ff7a3d;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.10);
    position: relative;
    z-index: 1;
}

.cta-banner .btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 36px rgba(0, 0, 0, 0.15);
}

/* ========== 页脚 ========== */
.site-footer { 
    padding: 72px 0 32px; 
    background: #2d2a28;
    color: rgba(255,255,255,0.8);
    position: relative;
}

.site-footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #ff8a5c, #ffb07c, #ffd4a8);
}

.site-footer .container { 
    position: relative;
    z-index: 1;
}

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

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

.footer-brand .logo .logo-icon {
    background: linear-gradient(135deg, #ff8a5c, #ffb07c);
}

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

.footer-col h5 {
    color: #fff;
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}

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

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

.footer-col ul li a {
    color: rgba(255,255,255,0.55);
    text-decoration: none;
    font-size: 0.9rem;
    transition: all 0.25s ease;
}

.footer-col ul li a:hover {
    color: #ff8a5c;
    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: 0.85rem; 
    opacity: 0.5;
    letter-spacing: 0.3px;
}

/* ========== 工具类 ========== */
.text-accent { 
    color: #ff8a5c; 
}

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

.seo-description { 
    max-width: 600px; 
    margin: 0 auto 48px; 
    opacity: 0.7; 
    color: #5a5550;
    line-height: 1.7;
}

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

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero p {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-image {
        max-width: 80%;
        margin: 0 auto;
        transform: none;
    }
    
    .hero-image:hover {
        transform: none;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero h1 {
        font-size: 2.6rem;
    }
    
    .stats-bar {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .feature-block { 
        grid-template-columns: 1fr; 
        gap: 40px;
    }
    
    .feature-block.reverse {
        direction: ltr;
    }
    
    .feature-image {
        max-width: 90%;
        margin: 0 auto;
    }
    
    .stats-bar { 
        grid-template-columns: repeat(2, 1fr); 
    }
    
    .footer-grid { 
        grid-template-columns: 1fr 1fr; 
    }
    
    .main-nav { 
        display: none; 
    }
    
    .menu-toggle { 
        display: flex; 
    }
    
    .main-nav.open { 
        display: flex; 
        flex-direction: column; 
        position: absolute; 
        top: 72px; 
        left: 0; 
        width: 100%; 
        background: rgba(255, 248, 244, 0.98);
        backdrop-filter: blur(18px);
        padding: 24px 28px; 
        gap: 20px;
        box-shadow: 0 20px 40px rgba(0, 0, 0, 0.06);
        border-bottom: 1px solid rgba(255, 138, 92, 0.10);
    }
    
    .main-nav.open a {
        font-size: 1.05rem;
    }
    
    .main-nav.open .nav-cta {
        text-align: center;
        margin-top: 4px;
    }
    
    .section {
        padding: 72px 0;
    }
    
    .hero {
        min-height: auto;
        padding: 100px 0 60px;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .hero-image {
        max-width: 100%;
    }
    
    .cards-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }
}

@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; 
        align-items: center;
    }
    
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.6rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .container {
        padding: 0 20px;
    }
    
    .cta-banner {
        padding: 40px 24px;
    }
    
    .cta-banner h2 {
        font-size: 1.5rem;
    }
    
    .hero-deco {
        display: none;
    }
}

/* ========== 动画增强 ========== */
@keyframes floatSoft {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-8px);
    }
}

.hero-image {
    animation: floatSoft 6s ease-in-out infinite;
}

.category-card:nth-child(2) .card-icon {
    animation-delay: 0.2s;
}

/* 加载进场动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.section {
    animation: fadeInUp 0.6s ease forwards;
}

.section:nth-child(2) { animation-delay: 0.1s; }
.section:nth-child(3) { animation-delay: 0.2s; }
.section:nth-child(4) { animation-delay: 0.3s; }
.section:nth-child(5) { animation-delay: 0.4s; }