/* ========== 基础样式 ========== */
:root {
    /* 主题色 */
    --primary-color: #4F46E5;
    --primary-light: #6366F1;
    --primary-dark: #4338CA;
    --secondary-color: #06B6D4;
    --accent-color: #F59E0B;

    /* 中性色 */
    --dark: #1F2937;
    --dark-light: #374151;
    --gray: #6B7280;
    --light-gray: #E5E7EB;
    --white: #FFFFFF;
    --bg-light: #F9FAFB;

    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-blue: linear-gradient(135deg, #667eea 0%, #06B6D4 100%);
    --gradient-purple: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-ocean: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* 动画时长 */
    --transition-fast: 0.2s;
    --transition-normal: 0.3s;
    --transition-slow: 0.5s;
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: var(--dark);
    line-height: 1.6;
    overflow-x: hidden;
    background: var(--bg-light);
}

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

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

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

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

.navbar.scrolled {
    box-shadow: var(--shadow-md);
    background: rgba(255, 255, 255, 0.98);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand {
    display: flex;
    flex-direction: column;
}

.nav-brand h2 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-blue);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-subtitle {
    font-size: 0.7rem;
    color: var(--gray);
    letter-spacing: 2px;
    margin-top: -4px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--dark);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-blue);
    transition: width var(--transition-normal);
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--dark);
    border-radius: 3px;
    transition: all var(--transition-normal);
}

/* ========== Hero 区域 ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="white" stroke-width="0.5" opacity="0.1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(100px, 100px); }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
    color: var(--white);
    max-width: 900px;
    padding: 2rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    animation: fadeInUp 1s ease-out;
}

.gradient-text {
    background: linear-gradient(to right, #f093fb 0%, #f5576c 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    line-height: 1.8;
    animation: fadeInUp 1s ease-out 0.2s backwards;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease-out 0.4s backwards;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--white);
    color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
    border: 2px solid var(--white);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-top: 4rem;
    animation: fadeInUp 1s ease-out 0.6s backwards;
}

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

.stat-item h3 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.stat-item p {
    font-size: 0.95rem;
    opacity: 0.9;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-indicator span {
    display: block;
    width: 30px;
    height: 50px;
    border: 2px solid var(--white);
    border-radius: 25px;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    width: 6px;
    height: 10px;
    background: var(--white);
    border-radius: 3px;
    transform: translateX(-50%);
    animation: scrollDown 2s infinite;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

@keyframes scrollDown {
    0% {
        opacity: 0;
        transform: translateX(-50%) translateY(0);
    }
    40% {
        opacity: 1;
    }
    80% {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    100% {
        opacity: 0;
    }
}

/* ========== 通用区域样式 ========== */
section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-tag {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    color: var(--primary-color);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--dark);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto;
}

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

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.about-card {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 20px;
    margin-bottom: 2rem;
    transition: all var(--transition-normal);
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.icon-box {
    width: 60px;
    height: 60px;
    background: var(--gradient-blue);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.icon-box i {
    font-size: 1.8rem;
    color: var(--white);
}

.about-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--dark);
}

.about-card p {
    color: var(--gray);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.timeline {
    list-style: none;
    padding-left: 0;
}

.timeline li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    color: var(--gray);
}

.timeline li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 1rem;
    width: 10px;
    height: 10px;
    background: var(--primary-color);
    border-radius: 50%;
}

.timeline li strong {
    color: var(--primary-color);
    font-weight: 700;
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.image-grid img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    border-radius: 15px;
    transition: all var(--transition-normal);
}

.image-grid img:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* ========== 核心服务 ========== */
.services {
    background: var(--bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.service-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 20px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.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-normal);
}

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

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.service-icon {
    width: 70px;
    height: 70px;
    background: var(--gradient-blue);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.service-icon i {
    font-size: 2rem;
    color: var(--white);
}

.service-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    color: var(--dark);
}

.service-card p {
    color: var(--gray);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.service-features {
    list-style: none;
    padding: 0;
}

.service-features li {
    padding: 0.5rem 0;
    color: var(--dark-light);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.service-features i {
    color: var(--primary-color);
    font-size: 0.9rem;
}

/* ========== 成功案例 ========== */
.success {
    background: var(--white);
}

.success-showcase {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-bottom: 4rem;
}

.showcase-image {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

.showcase-image:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-xl);
}

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

.success-universities {
    text-align: center;
    margin-top: 4rem;
}

.success-universities h3 {
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--dark);
}

.universities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.uni-item {
    background: var(--bg-light);
    padding: 2rem;
    border-radius: 15px;
    transition: all var(--transition-normal);
}

.uni-item:hover {
    background: var(--white);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.uni-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.uni-item h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.uni-item p {
    font-size: 0.9rem;
    color: var(--gray);
}

/* ========== 合作生态 ========== */
.partners {
    background: var(--bg-light);
}

.partners-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    align-items: center;
}

.partner-image {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

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

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

.partners-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.partner-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    transition: all var(--transition-normal);
}

.partner-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.partner-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-blue);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1rem;
}

.partner-icon i {
    font-size: 1.5rem;
    color: var(--white);
}

.partner-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    color: var(--dark);
}

.partner-card p {
    color: var(--gray);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ========== 联系我们 ========== */
.contact {
    background: var(--white);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.info-card {
    display: flex;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 15px;
    margin-bottom: 1.5rem;
    transition: all var(--transition-normal);
}

.info-card:hover {
    background: var(--white);
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
}

.info-icon {
    width: 50px;
    height: 50px;
    background: var(--gradient-blue);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.info-icon i {
    font-size: 1.3rem;
    color: var(--white);
}

.info-text h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.info-text p {
    color: var(--gray);
    line-height: 1.6;
    margin-bottom: 0.25rem;
}

.info-text small {
    color: var(--gray);
    font-size: 0.85rem;
}

.contact-form {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

.form-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.form-description {
    color: var(--gray);
    font-size: 0.95rem;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.5rem;
}

.form-group label .required {
    color: #EF4444;
    margin-left: 2px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--light-gray);
    border-radius: 10px;
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--dark);
    transition: border-color 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
    background: var(--white);
    line-height: 1.5;
}

.form-group input::placeholder,
.form-group select::placeholder,
.form-group textarea::placeholder {
    color: #9CA3AF;
    transition: color 0.3s ease;
}

.form-group input:hover,
.form-group select:hover,
.form-group textarea:hover {
    border-color: #D1D5DB;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.08);
}

.form-group input:focus::placeholder,
.form-group select:focus::placeholder,
.form-group textarea:focus::placeholder {
    color: #C1C5CB;
}

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

/* Select 下拉框样式 */
.form-group select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    cursor: pointer;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.2em;
    padding-right: 2.5rem;
    font-weight: 500;
}

.form-group select:focus {
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234F46E5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
}

.form-group select option {
    padding: 0.75rem;
    background: var(--white);
    color: var(--dark);
    font-weight: 500;
}

.form-group select option:first-child {
    color: var(--gray);
}

/* 提交按钮 */
.btn-submit {
    width: 100%;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    margin-top: 0.5rem;
    transition: all var(--transition-normal);
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(79, 70, 229, 0.2);
}

/* 表单验证样式 */
.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: #EF4444;
    background-color: #FEF2F2;
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.form-group .error-message {
    display: block;
    color: #EF4444;
    font-size: 0.85rem;
    margin-top: 0.5rem;
    padding-left: 0.25rem;
    animation: fadeInDown 0.3s ease;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-group input.success,
.form-group select.success,
.form-group textarea.success {
    border-color: #10B981;
    background-color: #F0FDF4;
}

/* 加载状态 */
.btn-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-submit.loading {
    position: relative;
    color: transparent;
}

.btn-submit.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 2px solid var(--white);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.office-images {
    margin-top: 4rem;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

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

/* ========== 页脚 ========== */
.footer {
    background: var(--dark);
    color: var(--white);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-about h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    background: var(--gradient-blue);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-about p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.8;
    margin-bottom: 0.5rem;
}

.footer-slogan {
    font-style: italic;
    font-size: 0.95rem;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
}

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

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    transition: all var(--transition-fast);
}

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

.footer-contact p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-contact i {
    color: var(--primary-light);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

/* ========== 返回顶部按钮 ========== */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-blue);
    border: none;
    border-radius: 50%;
    color: var(--white);
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
}

.scroll-top.show {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

/* ========== 响应式设计 ========== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

    .partners-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--white);
        flex-direction: column;
        padding: 2rem;
        gap: 0;
        box-shadow: var(--shadow-lg);
        transition: left var(--transition-normal);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        padding: 1rem 0;
        border-bottom: 1px solid var(--light-gray);
    }

    .hamburger {
        display: flex;
    }

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

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

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

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

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

    .hero-stats {
        gap: 2rem;
    }

    .stat-item h3 {
        font-size: 2rem;
    }

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

    .services-grid {
        grid-template-columns: 1fr;
    }

    .success-showcase {
        grid-template-columns: 1fr;
    }

    .partners-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .image-grid {
        grid-template-columns: 1fr;
    }

    /* 移动端表单优化 */
    .contact-form {
        padding: 1.5rem;
    }

    .form-title {
        font-size: 1.5rem;
    }

    .form-description {
        font-size: 0.9rem;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
        font-size: 16px; /* 防止iOS自动缩放 */
        padding: 0.875rem 1rem;
    }

    .form-group select {
        background-size: 1em;
        padding-right: 2.5rem;
    }

    .form-group label {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

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

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .universities-grid {
        grid-template-columns: 1fr;
    }

    /* 移动端通知样式 */
    .notification {
        right: 15px !important;
        left: 15px;
        max-width: calc(100% - 30px) !important;
        font-size: 0.9rem !important;
    }
}

/* ========== AOS 动画优化 ========== */
[data-aos] {
    pointer-events: auto;
}

/* ========== 打印样式 ========== */
@media print {
    .navbar,
    .scroll-top,
    .scroll-indicator {
        display: none;
    }
}