/* ============================================
   码上互动科技 - 主样式文件 (优化版)
   ============================================ */

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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --accent: #06b6d4;
    --dark: #0f172a;
    --dark-light: #1e293b;
    --text: #334155;
    --text-light: #64748b;
    --text-lighter: #94a3b8;
    --bg: #ffffff;
    --bg-light: #f8fafc;
    --bg-section: #f1f5f9;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 28px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(37, 99, 235, 0.45);
}

.btn-outline {
    background: rgba(255,255,255,0.15);
    color: #fff;
    border: 1.5px solid rgba(255,255,255,0.4);
    backdrop-filter: blur(4px);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.25);
    border-color: rgba(255,255,255,0.7);
}

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

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

.btn-light {
    background: rgba(255,255,255,0.95);
    color: var(--primary);
    border: 1.5px solid var(--border);
}

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

.btn-lg { padding: 14px 36px; font-size: 16px; }
.btn-block { width: 100%; padding: 14px; }

/* ============================================
   导航栏
   ============================================ */

/* 导航栏默认样式（白色背景上） */
.header .logo-text { color: var(--dark); }
.header .nav-list a { color: var(--text); }
.header .nav-list a:hover,
.header .nav-list a.active { color: var(--primary); }
.header .btn-outline {
    color: var(--primary);
    border-color: var(--primary);
    background: transparent;
}


.header.scrolled {

.header.scrolled {
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-md);
    padding: 10px 0;
}

.header.scrolled .logo-text { color: var(--dark); }
.header.scrolled .nav-list a { color: var(--text); }
.header.scrolled .nav-list a:hover,
.header.scrolled .nav-list a.active { color: var(--primary); }
.header.scrolled .btn-outline {
    color: var(--primary);
    border-color: var(--primary);
    background: transparent;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo a { display: flex; align-items: center; gap: 10px; }

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    letter-spacing: 1px;
}

.nav-list { display: flex; align-items: center; gap: 8px; }

.nav-list a {
    color: rgba(255,255,255,0.85);
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 15px;
}

.nav-list a:hover,
.nav-list a.active {
    color: #fff;
    background: rgba(255,255,255,0.12);
}

.header-actions { display: flex; gap: 12px; }

.mobile-menu-btn {
    display: none;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
}

.header.scrolled .mobile-menu-btn { color: var(--dark); }

/* ============================================
   Banner - 使用本地图片
   ============================================ */
.banner {
    position: relative;
    height: 550px;
    display: flex;
    align-items: flex-start;
    padding-top: 60px;
    overflow: hidden;
}

.banner-bg {
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, #f5f3ff 0%, #e0f2fe 100%);
}

.banner-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(37, 99, 235, 0.3) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(6, 182, 212, 0.25) 0%, transparent 50%);
}

.banner-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 120px 0 80px;
}

.banner-title {
    font-size: 58px;
    font-weight: 700;
    color: #fff;
    line-height: 1.3;
    margin-bottom: 24px;
    letter-spacing: 2px;
}

.banner-title .highlight {
    background: linear-gradient(135deg, #60a5fa 0%, #22d3ee 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.banner-desc {
    font-size: 18px;
    color: var(--text-lighter);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.banner-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 48px;
}

.stat-item {
    text-align: center;
    padding: 24px 36px;
    background: rgba(255,255,255,0.08);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255,255,255,0.12);
}

.stat-num {
    display: block;
    font-size: 36px;
    font-weight: 700;
    color: #fff;
}

.stat-label {
    font-size: 14px;
    color: var(--text-lighter);
    margin-top: 4px;
}

.banner-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
}

.banner-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.4);
    font-size: 24px;
    animation: scrollBounce 2s infinite;
    z-index: 2;
}

@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ============================================
   Section 通用
   ============================================ */
.section-header { text-align: center; margin-bottom: 60px; }

.section-title {
    font-size: 38px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 2px;
}

.section-desc {
    font-size: 17px;
    color: var(--text-light);
    margin-top: 20px;
}

/* ============================================
   服务内容 - 移到最前面，优化设计
   ============================================ */
.services {
    padding: 100px 0;
    position: relative;
    background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
}

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

.service-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.service-card {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    padding: 36px;
    background: #fff;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    position: relative;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

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

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

.service-icon {
    width: 64px;
    height: 64px;
    min-width: 64px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: #fff;
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
}

.service-body {
    flex: 1;
    min-width: 200px;
}

.service-body h3 {
    font-size: 22px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 12px;
}

.service-body p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.8;
}

.service-img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-top: 12px;
    transition: transform 0.4s ease;
}

.service-card:hover .service-img {
    transform: scale(1.04);
}

/* ============================================
   核心优势展示
   ============================================ */
.core-advantages {
    padding: 60px 0;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
    position: relative;
    overflow: hidden;
}

.core-advantages::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 25% 50%, rgba(37, 99, 235, 0.2) 0%, transparent 50%),
        radial-gradient(ellipse at 75% 50%, rgba(6, 182, 212, 0.15) 0%, transparent 50%);
}

.core-advantages .container { position: relative; z-index: 1; }

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 24px;
}

.advantage-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 32px 16px;
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255,255,255,0.08);
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.advantage-item:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.2);
    transform: translateY(-6px);
}

.adv-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, #60a5fa 0%, #22d3ee 100%);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: #fff;
    margin-bottom: 16px;
}

.advantage-item h3 {
    font-size: 17px;
    color: #fff;
    font-weight: 600;
    margin-bottom: 6px;
}

.advantage-item p {
    font-size: 13px;
    color: var(--text-lighter);
}

/* ============================================
   产品展示 - 使用本地背景图
   ============================================ */
.products {
    padding: 100px 0;
    position: relative;
}

.products::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, rgba(248,250,252,0.95) 0%, rgba(255,255,255,0.98) 30%, rgba(255,255,255,0.98) 70%, rgba(248,250,252,0.95) 100%),
        url('../images/bg/products-bg.jpg') center/cover fixed;
}

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

.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

.product-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 24px 24px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

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

.product-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    color: #fff;
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
}

.product-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 12px;
}

.product-img-wrap {
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 16px;
}

.product-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.product-card:hover .product-img-wrap img {
    transform: scale(1.08);
}

.product-desc {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 14px;
}

.product-tag {
    display: inline-block;
    padding: 4px 16px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 500;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    color: var(--primary);
}

.more-products {
    text-align: center;
    margin-top: 56px;
}

.more-products .btn-outline-dark i {
    margin-left: 8px;
    transition: transform 0.3s;
}

.more-products .btn-outline-dark:hover i {
    transform: translateX(4px);
}

/* ============================================
   特色优势 - 使用本地背景图
   ============================================ */
.features {
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.features::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, rgba(15, 23, 42, 0.95) 0%, rgba(30, 58, 138, 0.92) 50%, rgba(15, 23, 42, 0.95) 100%),
        url('../images/bg/features-bg.jpg') center/cover fixed;
}

.features::after {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 30% 50%, rgba(37, 99, 235, 0.2) 0%, transparent 60%),
        radial-gradient(ellipse at 70% 50%, rgba(6, 182, 212, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.features .container { position: relative; z-index: 1; }
.features .section-title { color: #fff; }
.features .section-title::after {
    background: linear-gradient(135deg, #60a5fa 0%, #22d3ee 100%);
}
.features .section-desc { color: var(--text-lighter); }

.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.feature-item {
    padding: 48px 32px;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255,255,255,0.1);
    background: rgba(255,255,255,0.06);
    backdrop-filter: blur(12px);
    transition: var(--transition);
}

.feature-item:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.25);
    transform: translateY(-6px);
}

.feature-num {
    font-size: 56px;
    font-weight: 700;
    background: linear-gradient(135deg, rgba(96,165,250,0.5) 0%, rgba(34,211,238,0.4) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 20px;
    line-height: 1;
}

.feature-item h3 {
    font-size: 20px;
    color: #fff;
    margin-bottom: 12px;
    font-weight: 600;
}

.feature-item p {
    font-size: 14px;
    color: var(--text-lighter);
    line-height: 1.8;
}

/* ============================================
   案例展示 - 使用本地背景图
   ============================================ */
.cases {
    padding: 100px 0;
    position: relative;
}

.cases::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, rgba(255,255,255,0.95) 0%, rgba(248,250,252,0.98) 100%),
        url('../images/bg/cases-bg.jpg') center/cover fixed;
}

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

.case-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}

.case-card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: #fff;
    border: 1px solid var(--border);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.case-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.case-image {
    height: 200px;
    overflow: hidden;
    position: relative;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.case-card:hover .case-image img {
    transform: scale(1.1);
}

.case-image::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.2) 100%);
}

.case-content { padding: 24px; }

.case-content h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
}

.case-content p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ============================================
   联系我们 - 使用本地背景图
   ============================================ */
.contact {
    padding: 100px 0;
    position: relative;
}

.contact::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, rgba(15, 23, 42, 0.95) 0%, rgba(30, 41, 59, 0.97) 100%),
        url('../images/bg/contact-bg.jpg') center/cover fixed;
}

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

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    background: rgba(255,255,255,0.98);
    border-radius: var(--radius-xl);
    padding: 64px;
    box-shadow: var(--shadow-xl);
}

.contact-info h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
}

.contact-info > p {
    color: var(--text-light);
    margin-bottom: 40px;
    font-size: 17px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.contact-item i {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
}

.contact-item span { font-size: 16px; color: var(--text); }

.contact-form h3 {
    font-size: 26px;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 32px;
}

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-family: inherit;
    color: var(--text);
    background: var(--bg-light);
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
    background: #fff;
}

.form-group textarea { height: 120px; resize: vertical; }

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 18px center;
    cursor: pointer;
}

/* ============================================
   页脚 - 使用本地背景图
   ============================================ */
.footer {
    position: relative;
    padding: 60px 0 0;
}

.footer::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, rgba(15, 23, 42, 0.98) 0%, rgba(15, 23, 42, 1) 100%),
        url('../images/bg/footer-bg.jpg') center/cover;
}

.footer::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
}

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

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .logo { margin-bottom: 16px; }
.footer-brand .logo-text { color: #fff; }
.footer-brand p { color: var(--text-lighter); font-size: 14px; line-height: 1.8; }

.footer-links h4 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 20px; }
.footer-links li { margin-bottom: 12px; }
.footer-links a { color: var(--text-lighter); font-size: 14px; }
.footer-links a:hover { color: #fff; }

.footer-qrcode h4 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 16px; }

.qrcode-placeholder {
    width: 120px;
    height: 120px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-lighter);
    gap: 8px;
}

.qrcode-placeholder i { font-size: 36px; color: #07c160; }
.qrcode-placeholder span { font-size: 12px; }

.footer-bottom { padding: 24px 0; text-align: center; }
.footer-bottom p { color: var(--text-lighter); font-size: 13px; }

/* ============================================
   动画
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .service-grid { grid-template-columns: 1fr; }
    .advantages-grid { grid-template-columns: repeat(2, 1fr); }
    .case-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: 1fr 1fr 1fr; }
    .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
    .nav { display: none; }
    .header-actions { display: none; }
    .mobile-menu-btn { display: block; }
    .banner-title { font-size: 38px; }
    .banner-desc { font-size: 16px; }
    .banner-stats { gap: 16px; flex-wrap: wrap; }
    .stat-item { padding: 16px 24px; }
    .stat-num { font-size: 28px; }
    .section-title { font-size: 30px; }
    .product-grid { grid-template-columns: 1fr; }
    .feature-grid { grid-template-columns: 1fr; }
    .service-grid { grid-template-columns: 1fr; }
    .advantages-grid { grid-template-columns: 1fr; }
    .case-grid { grid-template-columns: 1fr; }
    .contact-wrapper { grid-template-columns: 1fr; padding: 32px 24px; }
    .footer-content { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    .banner-stats { flex-direction: column; gap: 12px; }
    .banner-actions { flex-direction: column; align-items: center; }
    .btn-lg { width: 100%; }
}


/* ====== 科技感增强（浅色主题兼容） ====== */
.banner-title {
    font-family: 'Rajdhani', 'Noto Sans SC', sans-serif;
    letter-spacing: 2px;
    font-weight: 700;
}
.stat-num {
    font-family: 'Rajdhani', 'Noto Sans SC', sans-serif;
    font-weight: 700;
    font-size: 36px;
    color: var(--primary);
    display: inline-block;
}
.stat-label {
    font-family: 'Rajdhani', 'Noto Sans SC', sans-serif;
    font-size: 14px;
    letter-spacing: 1px;
}