:root {
    --primary-color: #1a365d;
    --secondary-color: #d4a574;
    --bg-color: #f8f9fa;
    --white: #ffffff;
    --text-color: #333333;
    --text-light: #666666;
    --border-color: #e5e7eb;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.12);
    --transition: all 0.3s ease;
    --section-padding: 80px 20px;
    --max-width: 1200px;
    --border-radius: 8px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    padding-top: 60px;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
    position: relative;
}

.section-title h2 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 700;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--secondary-color);
    margin: 0 auto;
    border-radius: 2px;
}

.section-title p {
    color: var(--text-light);
    font-size: 15px;
    margin-top: 15px;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--white);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

header.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

nav {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    gap: 30px;
}

.nav-menu a {
    font-size: 15px;
    color: var(--text-color);
    transition: var(--transition);
    position: relative;
}

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

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

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

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

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

#hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #2d4a7a 100%);
    color: var(--white);
    text-align: center;
    padding: 100px 20px;
    position: relative;
    overflow: hidden;
}

#hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

#hero h1 {
    font-size: 36px;
    margin-bottom: 20px;
    font-weight: 700;
    line-height: 1.3;
}

#hero p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 30px;
}

.hero-btn {
    display: inline-block;
    padding: 14px 40px;
    background: var(--secondary-color);
    color: var(--white);
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    font-size: 16px;
}

.hero-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(212, 165, 116, 0.4);
}

section {
    padding: var(--section-padding);
}

#intro {
    background: var(--white);
}

.intro-content {
    max-width: 900px;
    margin: 0 auto;
}

.intro-content article {
    margin-bottom: 30px;
}

.intro-content h3 {
    color: var(--primary-color);
    font-size: 20px;
    margin-bottom: 12px;
}

.intro-content p {
    color: var(--text-light);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 12px;
}

#comparison {
    background: var(--bg-color);
}

.table-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    min-width: 600px;
}

thead {
    background: var(--primary-color);
    color: var(--white);
}

th {
    padding: 16px 20px;
    text-align: left;
    font-weight: 600;
    font-size: 15px;
}

td {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
    color: var(--text-color);
}

tbody tr {
    transition: var(--transition);
}

tbody tr:nth-child(even) {
    background: #f9fafb;
}

tbody tr:hover {
    background: #fff8f0;
    transform: translateX(4px);
}

#universities {
    background: var(--white);
}

.tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 30px;
    border: 2px solid var(--border-color);
    background: var(--white);
    color: var(--text-color);
    border-radius: 50px;
    cursor: pointer;
    font-size: 15px;
    font-weight: 500;
    transition: var(--transition);
}

.tab-btn:hover {
    border-color: var(--secondary-color);
    color: var(--secondary-color);
}

.tab-btn.active {
    background: var(--primary-color);
    color: var(--white);
    border-color: var(--primary-color);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

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

.school-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}

.school-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.school-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}

.school-card-header {
    padding: 24px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #2d4a7a 100%);
    color: var(--white);
}

.school-card-header h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.school-card-header .tag {
    display: inline-block;
    padding: 4px 12px;
    background: var(--secondary-color);
    border-radius: 4px;
    font-size: 12px;
}

.school-card-body {
    padding: 20px 24px;
}

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

.school-card-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.school-card-footer .price {
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 16px;
}

.school-card-footer .detail-btn {
    padding: 8px 20px;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 4px;
    font-size: 13px;
    transition: var(--transition);
}

.school-card-footer .detail-btn:hover {
    background: var(--primary-color);
    color: var(--white);
}

#popular {
    background: var(--bg-color);
}

.popular-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.popular-item {
    display: flex;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
    transition: var(--transition);
}

.popular-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-hover);
}

.popular-item-number {
    flex-shrink: 0;
    width: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, #2d4a7a 100%);
    color: var(--white);
    font-size: 24px;
    font-weight: 700;
}

.popular-item-content {
    flex: 1;
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.popular-item-content h3 {
    font-size: 17px;
    color: var(--primary-color);
    margin-bottom: 8px;
}

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

.popular-item-action {
    flex-shrink: 0;
    padding: 20px 24px;
    display: flex;
    align-items: center;
}

.popular-item-action .btn {
    padding: 10px 24px;
    background: var(--secondary-color);
    color: var(--white);
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    white-space: nowrap;
}

.popular-item-action .btn:hover {
    background: #c49564;
}

#contact {
    background: var(--white);
}

.contact-wrapper {
    max-width: 800px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.contact-card {
    background: var(--bg-color);
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

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

.contact-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary-color) 0%, #2d4a7a 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 24px;
}

.contact-card h3 {
    color: var(--primary-color);
    font-size: 18px;
    margin-bottom: 12px;
}

.contact-card p {
    color: var(--text-light);
    font-size: 15px;
    margin-bottom: 16px;
}

.contact-card .wechat-id {
    display: inline-block;
    padding: 10px 24px;
    background: var(--white);
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
    border-radius: 50px;
    font-weight: 600;
    font-size: 16px;
}

.wechat-icon {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.wechat-icon::before {
    content: '';
    width: 20px;
    height: 20px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23d4a574'%3E%3Cpath d='M8.691 2.188C3.891 2.188 0 5.476 0 9.53c0 2.212 1.17 4.203 3.002 5.55a.59.59 0 0 1 .213.665l-.39 1.48c-.019.07-.048.141-.048.213 0 .163.13.295.29.295a.326.326 0 0 0 .167-.054l1.903-1.114a.864.864 0 0 1 .717-.098 10.16 10.16 0 0 0 2.837.403c.276 0 .543-.027.811-.05-.857-2.578.157-4.972 1.932-6.446 1.703-1.415 3.882-1.98 5.853-1.838-.576-3.583-4.196-6.348-8.596-6.348zM5.785 5.991c.642 0 1.162.529 1.162 1.18a1.17 1.17 0 0 1-1.162 1.178A1.17 1.17 0 0 1 4.623 7.17c0-.651.52-1.18 1.162-1.18zm5.813 0c.642 0 1.162.529 1.162 1.18a1.17 1.17 0 0 1-1.162 1.178 1.17 1.17 0 0 1-1.162-1.178c0-.651.52-1.18 1.162-1.18zm5.34 2.867c-1.797-.052-3.746.512-5.28 1.786-1.72 1.428-2.687 3.72-1.78 6.22.942 2.453 3.666 4.229 6.884 4.229.826 0 1.622-.12 2.361-.336a.722.722 0 0 1 .598.082l1.584.926a.272.272 0 0 0 .14.047c.134 0 .24-.111.24-.247 0-.06-.023-.12-.038-.177l-.327-1.233a.582.582 0 0 1-.023-.156.49.49 0 0 1 .201-.398C23.024 18.48 24 16.82 24 14.98c0-3.21-2.931-5.837-7.062-6.122zm-3.168 2.965c.535 0 .969.44.969.982a.976.976 0 0 1-.969.983.976.976 0 0 1-.969-.983c0-.542.434-.982.97-.982zm4.857 0c.535 0 .969.44.969.982a.976.976 0 0 1-.969.983.976.976 0 0 1-.969-.983c0-.542.434-.982.969-.982z'/%3E%3C/svg%3E") no-repeat center;
    background-size: contain;
}

footer {
    background: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 30px 20px;
    font-size: 14px;
    opacity: 0.9;
}

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--secondary-color);
    transform: translateY(-4px);
}

.back-to-top::before {
    content: '';
    width: 12px;
    height: 12px;
    border-top: 2px solid var(--white);
    border-right: 2px solid var(--white);
    transform: rotate(-45deg);
    margin-bottom: -4px;
}

@media (min-width: 768px) {
    #hero h1 {
        font-size: 44px;
    }

    #hero p {
        font-size: 20px;
    }

    .section-title h2 {
        font-size: 32px;
    }

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

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

@media (min-width: 1200px) {
    .container {
        padding: 0;
    }

    nav {
        padding: 0;
    }

    #hero h1 {
        font-size: 52px;
    }

    .school-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .contact-wrapper {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 767px) {
    body {
        padding-top: 60px;
    }

    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-menu a {
        display: block;
        padding: 14px 0;
        border-bottom: 1px solid var(--border-color);
        font-size: 16px;
    }

    .nav-menu li:last-child a {
        border-bottom: none;
    }

    .hamburger {
        display: flex;
    }

    #hero {
        padding: 80px 20px;
    }

    #hero h1 {
        font-size: 28px;
    }

    #hero p {
        font-size: 16px;
    }

    .hero-btn {
        padding: 12px 32px;
        font-size: 15px;
    }

    section {
        padding: 60px 20px;
    }

    .section-title h2 {
        font-size: 24px;
    }

    .section-title {
        margin-bottom: 35px;
    }

    .tab-btn {
        padding: 10px 22px;
        font-size: 14px;
    }

    .popular-item {
        flex-direction: column;
    }

    .popular-item-number {
        width: 100%;
        height: 50px;
        font-size: 20px;
    }

    .popular-item-action {
        justify-content: center;
        padding-top: 0;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }
}