/* ============================================
   南京小微网络软件有限责任公司 - 网站样式
   主色：蓝色 #0066FF / 白色 / 红色点缀 #FF3333
   ============================================ */

/* CSS 变量定义 */
:root {
    --primary-blue: #0066FF;
    --primary-blue-dark: #0052CC;
    --primary-blue-light: #3385FF;
    --accent-red: #FF3333;
    --accent-red-dark: #E62E2E;
    --white: #FFFFFF;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    --gradient-blue: linear-gradient(135deg, #0066FF 0%, #00D4FF 100%);
    --gradient-dark: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--white);
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

/* 容器 */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 960px;
}

/* 头部导航 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    transition: all var(--transition-base);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

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

.logo img {
    height: 40px;
    width: auto;
}

/* 导航菜单 */
.nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--gray-600);
    border-radius: 8px;
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-blue);
    background: var(--gray-100);
}

.nav-link.active {
    font-weight: 600;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    cursor: pointer;
    background: none;
    border: none;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    transition: all var(--transition-fast);
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--gradient-blue);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(0, 102, 255, 0.39);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 255, 0.23);
}

.btn-secondary {
    background: var(--white);
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--primary-blue);
    color: var(--white);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--primary-blue);
    border-color: var(--white);
}

.btn-red {
    background: var(--accent-red);
    color: var(--white);
}

.btn-red:hover {
    background: var(--accent-red-dark);
    transform: translateY(-2px);
}

/* Hero 区域 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: var(--gradient-dark);
    overflow: hidden;
    padding-top: 72px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 80%, rgba(0, 102, 255, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(0, 212, 255, 0.1) 0%, transparent 50%);
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
    padding: 80px 0;
}

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

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    color: var(--white);
    margin-bottom: 24px;
}

.hero-title span {
    background: var(--gradient-blue);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--gray-300);
    margin-bottom: 32px;
    max-width: 500px;
}

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

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 60px;
}

.stat-card {
    text-align: center;
    padding: 24px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

.stat-number {
    font-size: 36px;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 8px;
}

.stat-number span {
    color: var(--primary-blue-light);
}

.stat-label {
    font-size: 14px;
    color: var(--gray-400);
}

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

.hero-visual-inner {
    position: relative;
    width: 100%;
    max-width: 500px;
    aspect-ratio: 1;
}

.floating-card {
    position: absolute;
    padding: 20px 24px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    color: var(--white);
    animation: float 6s ease-in-out infinite;
}

.floating-card:nth-child(1) {
    top: 10%;
    right: 0;
    animation-delay: 0s;
}

.floating-card:nth-child(2) {
    bottom: 20%;
    left: 0;
    animation-delay: -2s;
}

.floating-card:nth-child(3) {
    top: 50%;
    right: -20px;
    animation-delay: -4s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.floating-card-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-blue);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    font-size: 24px;
}

.floating-card-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.floating-card-desc {
    font-size: 13px;
    color: var(--gray-400);
}

/* 区块标题 */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-label {
    display: inline-block;
    padding: 6px 16px;
    background: var(--gray-100);
    color: var(--primary-blue);
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 20px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 16px;
    line-height: 1.2;
}

.section-subtitle {
    font-size: 18px;
    color: var(--gray-500);
}

/* 服务卡片 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    position: relative;
    padding: 40px 32px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 20px;
    transition: all var(--transition-base);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-blue);
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.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;
    background: var(--gray-50);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 24px;
    transition: all var(--transition-base);
}

.service-card:hover .service-icon {
    background: var(--gradient-blue);
    color: var(--white);
}

.service-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.service-desc {
    font-size: 15px;
    color: var(--gray-500);
    line-height: 1.7;
    margin-bottom: 20px;
    /* 固定3行高度，保持卡片整齐 */
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 76px;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-blue);
    margin-top: auto;
    padding-top: 16px;
}

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

/* 特性列表 */
.features-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 8px;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--gray-600);
}

.feature-item::before {
    content: '✓';
    width: 20px;
    height: 20px;
    background: var(--primary-blue);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    flex-shrink: 0;
}

/* 案例展示 */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.case-card {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    background: var(--gray-900);
    aspect-ratio: 16/10;
}

.case-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.7;
    transition: all var(--transition-base);
}

.case-card:hover .case-image {
    opacity: 0.4;
    transform: scale(1.05);
}

.case-content {
    position: absolute;
    inset: 0;
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, transparent 60%);
}

.case-tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent-red);
    color: var(--white);
    font-size: 12px;
    font-weight: 600;
    border-radius: 4px;
    margin-bottom: 12px;
    width: fit-content;
}

.case-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 8px;
}

.case-desc {
    font-size: 14px;
    color: var(--gray-300);
    margin-bottom: 16px;
}

.case-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-blue-light);
}

/* 技术栈 */
.tech-section {
    background: var(--gray-50);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.tech-card {
    padding: 32px 24px;
    background: var(--white);
    border-radius: 16px;
    text-align: center;
    transition: all var(--transition-base);
}

.tech-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.tech-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    background: var(--gray-100);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
}

.tech-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.tech-desc {
    font-size: 14px;
    color: var(--gray-500);
}

/* 统计数据区域 */
.stats-section {
    background: var(--gradient-blue);
    color: var(--white);
    padding: 80px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}

.stat-item {
    padding: 20px;
}

.stat-item-number {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 8px;
}

.stat-item-label {
    font-size: 16px;
    opacity: 0.9;
}

/* 关于我们 */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-image {
    position: relative;
    border-radius: 24px;
    overflow: hidden;
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-content h3 {
    font-size: 32px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 20px;
}

.about-content p {
    font-size: 16px;
    color: var(--gray-600);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: 32px;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 12px;
}

.about-feature-icon {
    width: 48px;
    height: 48px;
    background: var(--gray-100);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.about-feature-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
}

/* 资质证书 */
.qualifications-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.qualification-item {
    padding: 32px 24px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 16px;
    text-align: center;
    transition: all var(--transition-base);
}

.qualification-item:hover {
    border-color: var(--primary-blue);
    transform: translateY(-4px);
}

.qualification-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: var(--gray-50);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}

.qualification-number {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary-blue);
    margin-bottom: 8px;
}

.qualification-text {
    font-size: 14px;
    color: var(--gray-600);
}

/* 页脚 */
.footer {
    background: var(--gray-900);
    color: var(--white);
    padding: 80px 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand img {
    height: 48px;
    margin-bottom: 20px;
    filter: brightness(0) invert(1);
}

.footer-desc {
    font-size: 15px;
    color: var(--gray-400);
    line-height: 1.7;
    margin-bottom: 24px;
}

.footer-title {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--white);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-link {
    font-size: 14px;
    color: var(--gray-400);
    transition: color var(--transition-fast);
}

.footer-link:hover {
    color: var(--primary-blue-light);
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 14px;
    color: var(--gray-400);
}

.footer-contact-icon {
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 40px;
    border-top: 1px solid var(--gray-800);
}

.footer-copyright {
    font-size: 14px;
    color: var(--gray-500);
}

.footer-copyright a:hover {
    color: var(--primary-blue-light);
}

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social-link {
    width: 40px;
    height: 40px;
    background: var(--gray-800);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.footer-social-link:hover {
    background: var(--primary-blue);
    transform: translateY(-4px);
}

/* 联系表单 */
.contact-section {
    background: var(--gray-50);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-form {
    background: var(--white);
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}

.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 14px 18px;
    font-size: 15px;
    border: 2px solid var(--gray-200);
    border-radius: 10px;
    background: var(--white);
    transition: border-color var(--transition-fast);
    font-family: inherit;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
}

.form-textarea {
    min-height: 140px;
    resize: vertical;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-info-item {
    display: flex;
    gap: 20px;
}

.contact-info-icon {
    width: 56px;
    height: 56px;
    background: var(--white);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: var(--shadow-sm);
}

.contact-info-content h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.contact-info-content p {
    font-size: 15px;
    color: var(--gray-500);
}

/* 页面标题 */
.page-header {
    background: var(--gradient-dark);
    padding: 160px 0 80px;
    text-align: center;
    color: var(--white);
}

.page-header-title {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
}

.page-header-subtitle {
    font-size: 18px;
    color: var(--gray-300);
}

/* 面包屑导航 */
.breadcrumb {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 24px;
    font-size: 14px;
}

.breadcrumb a {
    color: var(--gray-400);
}

.breadcrumb a:hover {
    color: var(--primary-blue-light);
}

.breadcrumb-separator {
    color: var(--gray-500);
}

.breadcrumb-current {
    color: var(--white);
}

/* 时间线 */
.timeline {
    position: relative;
    padding-left: 40px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gray-200);
}

.timeline-item {
    position: relative;
    padding-bottom: 40px;
}

.timeline-dot {
    position: absolute;
    left: -36px;
    top: 4px;
    width: 16px;
    height: 16px;
    background: var(--primary-blue);
    border-radius: 50%;
    border: 3px solid var(--white);
    box-shadow: 0 0 0 3px var(--primary-blue);
}

.timeline-content {
    background: var(--white);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--gray-200);
}

.timeline-year {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-blue);
    margin-bottom: 8px;
}

.timeline-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.timeline-desc {
    font-size: 14px;
    color: var(--gray-500);
}

/* 标签页 */
.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 40px;
    border-bottom: 2px solid var(--gray-200);
    padding-bottom: 0;
}

.tab-btn {
    padding: 16px 24px;
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-500);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab-btn:hover {
    color: var(--primary-blue);
}

.tab-btn.active {
    color: var(--primary-blue);
    border-bottom-color: var(--primary-blue);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
    box-shadow: var(--shadow-lg);
}

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

.back-to-top:hover {
    background: var(--primary-blue-dark);
    transform: translateY(-4px);
}

/* 大数据架构层级样式 - 统一hover效果 */
.arch-layer {
    margin-bottom: 30px;
    padding: 20px;
    background: var(--gray-50);
    border-radius: 12px;
    transition: all var(--transition-base);
    cursor: pointer;
}

.arch-layer:hover {
    background: var(--gradient-blue);
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.arch-layer:hover h4 {
    color: white;
}

.arch-layer:hover span {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.arch-layer h4 {
    margin-bottom: 16px;
    color: var(--gray-700);
    transition: color var(--transition-base);
}

.arch-layer-content {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.arch-layer-tag {
    padding: 8px 16px;
    background: white;
    border-radius: 20px;
    font-size: 14px;
    transition: all var(--transition-base);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 42px;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tech-grid,
    .stats-grid,
    .qualifications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 8px;
        border-bottom: 1px solid var(--gray-200);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .hero-grid-layout {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
        max-width: 300px;
        margin-left: auto;
        margin-right: auto;
    }
    
    .services-grid,
    .cases-grid,
    .about-grid,
    .contact-grid,
    .tech-grid,
    .stats-grid,
    .qualifications-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
    
    .about-features {
        grid-template-columns: 1fr;
    }
    
    .page-header-title {
        font-size: 36px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .btn {
        padding: 10px 20px;
        font-size: 14px;
    }
}