/* ==========================================
   清泰教育科技 - 企业官网样式（单页版）
   色系：清华大学紫色
   ========================================== */

:root {
    --tsinghua-purple: #6B2D8E;
    --purple-dark: #4A148C;
    
    --text-dark: #333333;
    --text-light: #666666;
    --white: #FFFFFF;
    --gray-bg: #F8F9FA;
    
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.15);
    
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--white);
}

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

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

/* ==========================================
   按钮
   ========================================== */
.btn {
    display: inline-block;
    padding: 12px 32px;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-align: center;
}

.btn-primary {
    background: var(--tsinghua-purple);
    color: var(--white);
    border-color: var(--tsinghua-purple);
}

.btn-primary:hover {
    background: var(--purple-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border-color: var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--tsinghua-purple);
}

.btn-lg {
    padding: 16px 48px;
    font-size: 18px;
}

/* ==========================================
   导航栏
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--tsinghua-purple);
}

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

.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--tsinghua-purple);
    color: var(--white);
    border-radius: 4px;
    font-size: 18px;
}

.nav-menu {
    display: flex;
    gap: 30px;
    list-style: none;
    align-items: center;
}

/* 导航右侧区域：菜单 + 按钮 */
.nav-right {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-menu a {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-dark);
    padding: 5px 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--tsinghua-purple);
    transition: var(--transition);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--tsinghua-purple);
}

.nav-platform-btn {
    display: inline-block;
    padding: 8px 20px;
    background: var(--tsinghua-purple);
    color: var(--white) !important;
    border-radius: 4px;
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
    text-decoration: none;
}

.nav-platform-btn:hover {
    background: var(--tsinghua-purple);
    opacity: 0.85;
    color: var(--white) !important;
    transform: translateY(-2px);
}

/* Header独立学习平台按钮 */
.header-platform-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 24px;
    background: linear-gradient(135deg, var(--tsinghua-purple) 0%, var(--purple-dark) 100%);
    color: var(--white);
    border-radius: 25px;
    font-size: 15px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(107, 45, 142, 0.3);
    white-space: nowrap;
}

.header-platform-btn::before {
    content: '📚';
    font-size: 16px;
}

.header-platform-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(107, 45, 142, 0.4);
    color: var(--white);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    transition: var(--transition);
}

/* ==========================================
   Hero区域
   ========================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -2;
}

.hero-bg-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(107, 45, 142, 0.9);
    z-index: -1;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--white);
    padding: 60px 20px;
    max-width: 900px;
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-title .highlight {
    color: #FFD700;
}

.hero-subtitle {
    font-size: 24px;
    font-weight: 500;
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 40px;
    opacity: 0.9;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--white);
    opacity: 0.7;
    cursor: pointer;
}

.hero-scroll span {
    display: block;
    font-size: 14px;
    margin-bottom: 10px;
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid var(--white);
    border-radius: 12px;
    margin: 0 auto;
    position: relative;
}

.scroll-indicator::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--white);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(16px); }
}

/* ==========================================
   科技动效
   ========================================== */
/* 科技网格 */
.tech-grid {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 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;
    z-index: -1;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: perspective(500px) rotateX(60deg) translateY(0); }
    100% { transform: perspective(500px) rotateX(60deg) translateY(60px); }
}

/* 粒子动效 */
.particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.8);
}

.particle:nth-child(1) { left: 10%; top: 20%; animation: float 8s ease-in-out infinite; }
.particle:nth-child(2) { left: 20%; top: 80%; animation: float 6s ease-in-out infinite 1s; }
.particle:nth-child(3) { left: 30%; top: 40%; animation: float 10s ease-in-out infinite 2s; }
.particle:nth-child(4) { left: 50%; top: 60%; animation: float 7s ease-in-out infinite 0.5s; }
.particle:nth-child(5) { left: 70%; top: 30%; animation: float 9s ease-in-out infinite 1.5s; }
.particle:nth-child(6) { left: 80%; top: 70%; animation: float 6s ease-in-out infinite 2.5s; }
.particle:nth-child(7) { left: 90%; top: 50%; animation: float 8s ease-in-out infinite 3s; }
.particle:nth-child(8) { left: 60%; top: 15%; animation: float 11s ease-in-out infinite 0.8s; }

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.6; }
    50% { transform: translateY(-30px) scale(1.5); opacity: 1; }
}

/* 电路连线 */
.circuit-lines {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.15;
}

.circuit-path {
    fill: none;
    stroke: rgba(255, 255, 255, 0.8);
    stroke-width: 2;
    stroke-dasharray: 10, 5;
}

.circuit-path-1 {
    animation: dash 3s linear infinite;
}

.circuit-path-2 {
    animation: dash 4s linear infinite reverse;
    stroke-dashoffset: 50;
}

.circuit-path-3 {
    animation: dash 3.5s linear infinite;
    stroke-dashoffset: 25;
}

@keyframes dash {
    to { stroke-dashoffset: -100; }
}

/* 发光节点 */
.circuit-path-1::after,
.circuit-path-2::after {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    background: #fff;
    border-radius: 50%;
    box-shadow: 0 0 10px #fff, 0 0 20px rgba(255,255,255,0.5);
}

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

.section-header.light .section-tag,
.section-header.light .section-title {
    color: var(--white);
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: var(--white);
    color: var(--tsinghua-purple);
    border: 2px solid var(--tsinghua-purple);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 16px;
}

.section-header.light .section-tag {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
}

/* ==========================================
   关于我们
   ========================================== */
.about {
    padding: 100px 0;
    background: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 60px;
}

.about-intro-text {
    font-size: 18px;
    font-weight: 500;
    color: var(--tsinghua-purple);
    margin-bottom: 16px;
}

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

.about-intro {
    max-width: 900px;
    margin: 0 auto 60px;
    text-align: center;
    font-size: 17px;
    color: var(--text-light);
    line-height: 1.9;
}

/* 核心价值观 */
.core-values {
    margin-bottom: 0;
}

.values-card {
    text-align: center;
    padding: 30px;
}

.values-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--tsinghua-purple);
    margin-bottom: 16px;
}

.values-main {
    font-size: 18px;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.values-sub {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.7;
    max-width: 700px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .values-main {
        font-size: 16px;
    }
}

.vision-mission {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 30px;
}

.vm-item {
    padding: 20px;
    background: var(--white);
    border: 1px solid #e0e0e0;
    border-radius: 8px;
}

.vm-item h4 {
    font-size: 18px;
    color: var(--tsinghua-purple);
    margin-bottom: 8px;
}

.vm-item p {
    font-size: 14px;
    color: var(--text-light);
}

.about-image {
    border-radius: 16px;
    overflow: hidden;
}

.about-image img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

/* ==========================================
   核心优势
   ========================================== */
.features-section {
    margin-top: 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    text-align: center;
    padding: 40px 30px;
    border-radius: 16px;
    transition: var(--transition);
    background: var(--white);
    border: 2px solid transparent;
}

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

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    background: var(--white);
    border: 2px solid var(--tsinghua-purple);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--tsinghua-purple);
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: var(--tsinghua-purple);
    color: var(--white);
}

.feature-icon svg {
    width: 40px;
    height: 40px;
}

.feature-card h3 {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 15px;
    color: var(--text-light);
}

/* ==========================================
   产品服务
   ========================================== */
.products {
    padding: 100px 0;
    background: var(--tsinghua-purple);
    color: var(--white);
    overflow: hidden;
}

.products .section-header.light .section-title {
    color: var(--white);
}

/* 轮播容器 - 固定大小 */
.products-carousel {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    overflow: hidden;
}

.carousel-track {
    display: flex;
    gap: 24px;
    transition: transform 0.5s ease;
}

/* 单个产品卡片 */
.product-card {
    flex: 0 0 calc(33.333% - 16px);
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    height: 360px;
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.2);
}

.product-image {
    height: 180px;
    overflow: hidden;
    background: #f0f0f0;
}

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

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-info {
    padding: 24px;
}

.product-info h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.product-info p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

/* 轮播导航 */
.carousel-nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-top: 40px;
}

.carousel-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.4);
    color: white;
    font-size: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.carousel-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.carousel-dots {
    display: flex;
    gap: 8px;
}

.carousel-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: var(--transition);
}

.carousel-dot.active {
    background: white;
    transform: scale(1.2);
}
/* ==========================================
   项目案例
   ========================================== */
.cases {
    padding: 100px 0;
    background: var(--gray-bg);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.case-item {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
}

.case-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: var(--transition);
}

.case-item:hover img {
    transform: scale(1.05);
}

.case-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 20px;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: var(--white);
    transform: translateY(100%);
    transition: var(--transition);
}

.case-item:hover .case-overlay {
    transform: translateY(0);
}

.case-overlay h4 {
    font-size: 18px;
    font-weight: 600;
}

/* ==========================================
   合作伙伴
   ========================================== */
.partners {
    padding: 60px 0;
    background: var(--gray-bg);
}

.partners .section-header .section-tag {
    background: var(--white);
    border: 2px solid var(--tsinghua-purple);
    color: var(--tsinghua-purple);
}

.partners .section-header .section-title {
    color: var(--text-dark);
}

.partners .section-header .section-desc {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 30px;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 16px;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.partner-logo {
    height: 120px;
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.1);
    padding: 16px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.partner-logo:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
}

.partner-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* 合作伙伴响应式 */
@media (max-width: 1200px) {
    .partners-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 768px) {
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 480px) {
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .partners .section-header .section-desc {
        font-size: 20px;
    }
}

/* ==========================================
   联系我们
   ========================================== */
.contact {
    padding: 100px 0;
    background: var(--tsinghua-purple);
    color: var(--white);
    position: relative;
}

.contact::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: linear-gradient(to bottom, rgba(107, 45, 142, 0.3), transparent);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    background: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--tsinghua-purple);
}

.contact-icon svg {
    width: 24px;
    height: 24px;
}

.contact-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 14px;
    opacity: 0.9;
}

/* 地图图片 */
.map-image {
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    height: 300px;
}

.map-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.contact-form-wrapper {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 40px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    transition: var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.7);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--white);
    background: rgba(255, 255, 255, 0.15);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
    margin-bottom: 20px;
}

.contact-form .btn-primary {
    width: 100%;
    background: var(--white);
    color: var(--tsinghua-purple);
    border-color: var(--white);
}

.contact-form .btn-primary:hover {
    background: transparent;
    color: var(--white);
}

/* ==========================================
   页脚
   ========================================== */
.footer {
    background: #f5f5f5;
    color: var(--text-dark);
    padding: 60px 0 0;
    border-top: 3px solid var(--tsinghua-purple);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid #e0e0e0;
}

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

.footer-brand p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.6;
}

.footer-logo-img {
    height: 50px;
    width: auto;
    background: white;
    padding: 5px 10px;
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}

.footer-links h4 {
    font-size: 18px;
    font-weight: 600;
    color: var(--tsinghua-purple);
    margin-bottom: 20px;
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-light);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--tsinghua-purple);
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding: 20px 0;
    font-size: 14px;
    color: var(--text-light);
}

.footer-bottom a {
    color: var(--tsinghua-purple);
    text-decoration: none;
}

.footer-bottom a:hover {
    text-decoration: underline;
}

/* ==========================================
   响应式
   ========================================== */
@media (max-width: 992px) {
    .about-content,
    .contact-content,
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .vision-mission {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 992px) {
    .nav-right {
        display: flex;
        align-items: center;
        gap: 20px;
    }
    
    .nav-menu {
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .nav-right {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background: var(--white);
        width: 100%;
        padding: 20px;
        box-shadow: var(--shadow-md);
        transition: var(--transition);
        align-items: stretch;
        gap: 0;
    }
    
    .nav-right.active {
        left: 0;
    }
    
    .nav-menu {
        flex-direction: column;
        gap: 0;
        align-items: stretch;
    }
    
    .nav-menu li {
        width: 100%;
        text-align: center;
        padding: 12px 0;
        border-bottom: 1px solid #f0f0f0;
    }
    
    .nav-menu li:last-child {
        border-bottom: none;
    }
    
    .header-platform-btn {
        margin-top: 15px;
        justify-content: center;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
}