/* 全局样式 */
:root {
    --primary-color: #8C5543;
    --secondary-color: #D4B483;
    --tertiary-color: #212121;
    --light-color: #F7F7F7;
    --dark-color: #2E2E2E;
    --transition: all 0.3s ease-in-out;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    --navbar-height: 80px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Serif SC', serif;
    line-height: 1.6;
    background-color: var(--light-color);
    color: var(--dark-color);
    overflow-x: hidden;
}

/* 页面加载动画 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--light-color);
    z-index: 9999;
    opacity: 1;
    transition: opacity 0.8s ease-out;
}

body.loaded::before {
    opacity: 0;
    pointer-events: none;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

section {
    padding: 80px 0;
}

/* 全屏高度部分 */
.section-fullheight {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: calc(var(--navbar-height) + 20px) 0 40px;
    box-sizing: border-box;
}

h1, h2, h3, h4 {
    font-weight: 600;
    line-height: 1.3;
}

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

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

a:hover {
    color: var(--secondary-color);
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 30px;
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 1px;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    transition: all 0.4s ease-in-out;
    z-index: -1;
}

.btn:hover::before {
    left: 100%;
}

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

.btn-primary:hover {
    background-color: var(--tertiary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--box-shadow);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: var(--box-shadow);
}

.section-title {
    text-align: center;
    margin-bottom: 60px;
    position: relative;
    font-size: 2.5rem;
    color: var(--tertiary-color);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--primary-color);
}

.section-dark {
    background-color: var(--tertiary-color);
    color: var(--light-color);
}

.section-dark .section-title {
    color: var(--light-color);
}

.section-light {
    background-color: #F2E9E4;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 5%;
    background-color: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.navbar.scrolled {
    padding: 10px 5%;
    background-color: rgba(255, 255, 255, 0.98);
}

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

.logo-img {
    height: 60px;
    transition: var(--transition);
}

.navbar.scrolled .logo-img {
    height: 50px;
}

.logo h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
    font-weight: 700;
    position: relative;
    display: inline-block;
}

.logo h1::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.logo:hover h1::after {
    width: 100%;
}

.nav-menu {
    display: flex;
    justify-content: space-between;
    align-items: center;
    list-style: none;
}

.nav-link {
    margin: 0 15px;
    padding: 8px 0;
    color: var(--dark-color);
    font-weight: 500;
    position: relative;
}

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

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

.menu-toggle {
    display: none;
    cursor: pointer;
}

.menu-toggle .bar {
    width: 25px;
    height: 3px;
    background-color: var(--tertiary-color);
    margin: 5px 0;
    transition: var(--transition);
    display: block;
}

.menu-toggle.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.menu-toggle.active .bar:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* 英雄区域样式 */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('../images/piano0.png');
    background-size: cover;
    background-position: center;
    color: white;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(140, 85, 67, 0.4), rgba(33, 33, 33, 0.6));
    opacity: 0.7;
}

.hero-content {
    max-width: 700px;
    padding: 0 20px;
    position: relative;
    z-index: 1;
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    animation: fadeInUp 1s ease-out;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 30px;
    animation: fadeInUp 1s ease-out 0.3s forwards;
    opacity: 0;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
}

.hero-content .btn {
    animation: fadeInUp 1s ease-out 0.6s forwards;
    opacity: 0;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

/* 滚动动画 */
.scroll-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.scroll-animate.animate {
    opacity: 1;
    transform: translateY(0);
}

/* 关于我们 */
.about-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
}

.about-image,
.about-text {
    flex: 1;
    min-width: 300px;
    padding: 20px;
}

.about-image img {
    border-radius: 10px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.about-image img:hover {
    transform: scale(1.03);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.about-text h3 {
    margin-bottom: 20px;
    font-size: 2rem;
    color: var(--primary-color);
}

.about-text p {
    margin-bottom: 15px;
}

/* 师资力量 */
.teachers-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}

.teacher-card {
    width: 300px;
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    transform-style: preserve-3d;
    perspective: 1000px;
}

.teacher-card:hover {
    transform: translateY(-10px) rotateX(5deg) rotateY(5deg);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.teacher-image {
    height: 250px;
    overflow: hidden;
    position: relative;
}

.teacher-image::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent 50%, rgba(0, 0, 0, 0.5));
    opacity: 0;
    transition: var(--transition);
}

.teacher-card:hover .teacher-image::after {
    opacity: 1;
}

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

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

.teacher-info {
    padding: 20px;
    text-align: center;
    transform: translateZ(20px);
}

.teacher-info h3 {
    margin-bottom: 10px;
    color: var(--primary-color);
    transition: var(--transition);
}

.teacher-card:hover .teacher-info h3 {
    color: var(--secondary-color);
}

.teacher-info h3 span {
    display: block;
    font-size: 0.9rem;
    font-weight: 400;
    margin-top: 5px;
    color: var(--secondary-color);
}

.teacher-info p {
    margin-bottom: 8px;
    font-size: 0.9rem;
}

/* 关于我们 - 老师详细介绍 */
.teacher-profile {
    margin-top: 60px;
}

.profile-title {
    text-align: center;
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 40px;
    position: relative;
}

.profile-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background-color: var(--primary-color);
}

.teacher-profile-content {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
    padding: 30px;
    background-color: white;
    border-radius: 15px;
    box-shadow: var(--box-shadow);
}

.teacher-profile-image {
    flex: 1;
    min-width: 300px;
    max-width: 400px;
}

.teacher-profile-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.teacher-profile-image img:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.teacher-profile-info {
    flex: 2;
    min-width: 400px;
}

.teacher-profile-info h3 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 20px;
    border-bottom: 2px solid rgba(140, 85, 67, 0.2);
    padding-bottom: 10px;
}

.teacher-profile-info h3 span {
    font-size: 1rem;
    color: var(--tertiary-color);
    opacity: 0.8;
    margin-left: 15px;
    font-weight: 400;
}

.teacher-profile-text {
    max-height: 400px;
    overflow-y: auto;
    padding-right: 20px;
}

.teacher-profile-text h4 {
    color: var(--secondary-color);
    margin: 20px 0 10px;
    font-size: 1.2rem;
}

.teacher-profile-text ul {
    list-style-type: none;
    margin-left: 0;
}

.teacher-profile-text li {
    margin-bottom: 8px;
    padding-left: 25px;
    position: relative;
}

.teacher-profile-text li::before {
    content: '♪';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    opacity: 0.7;
}

/* 课程介绍 */
.courses-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 40px;
    position: relative;
}

.course-card {
    flex: 1;
    min-width: 220px;
    background-color: white;
    border-radius: 10px;
    box-shadow: var(--box-shadow);
    transition: all 0.5s ease-in-out;
    position: relative;
    overflow: hidden;
    z-index: 1;
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
}

.course-card.expanded {
    flex: 3;
    min-width: 60%;
    transition: all 0.5s ease-in-out;
}

.course-card.collapsed {
    flex: 0;
    min-width: 80px;
    max-width: 80px;
    transition: all 0.5s ease-in-out;
}

.course-header {
    padding: 30px 20px;
    text-align: center;
    transition: var(--transition);
    flex: 0 0 auto;
}

.collapsed .course-header {
    padding: 20px 10px;
}

.course-card:hover {
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.course-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
    transition: var(--transition);
}

.collapsed .course-icon {
    font-size: 2rem;
    margin-bottom: 0;
}

.course-card:hover .course-icon {
    transform: scale(1.1);
    color: var(--secondary-color);
}

.course-card h3 {
    margin-bottom: 15px;
    color: var(--tertiary-color);
    transition: var(--transition);
}

.collapsed .course-card h3,
.collapsed .course-brief,
.collapsed .course-toggle {
    display: none;
}

.course-card:hover h3 {
    color: var(--primary-color);
}

.course-brief {
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.course-toggle {
    position: relative;
    z-index: 2;
    cursor: pointer;
    display: inline-block;
    padding: 8px 20px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.course-toggle:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
}

.course-detail {
    height: 0;
    overflow: hidden;
    transition: height 0.5s ease-in-out;
    background-color: #F9F5F1;
    flex: 1 1 auto;
}

.course-card.expanded .course-detail {
    overflow-y: auto;
    max-height: 60vh;
}

.course-detail-inner {
    padding: 25px 20px;
}

.course-detail h4 {
    color: var(--primary-color);
    margin: 15px 0 10px;
    font-size: 1.1rem;
}

.course-detail h4:first-child {
    margin-top: 0;
}

.course-detail ul {
    list-style: none;
    margin-left: 0;
}

.course-detail li {
    margin-bottom: 8px;
    position: relative;
    padding-left: 20px;
    font-size: 0.95rem;
}

.course-detail li::before {
    content: '♪';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-size: 0.9rem;
}

.course-detail p {
    font-size: 0.95rem;
    margin: 10px 0;
    padding-left: 20px;
}

/* 教学环境 */
.facility-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
}

.facility-image,
.facility-text {
    flex: 1;
    min-width: 300px;
    padding: 20px;
}

.facility-image img {
    border-radius: 10px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.facility-image img:hover {
    transform: scale(1.03) rotate(1deg);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.facility-text h3 {
    margin-bottom: 20px;
    font-size: 2rem;
    color: var(--primary-color);
}

.facility-text p {
    margin-bottom: 15px;
    position: relative;
    padding-left: 20px;
}

.facility-text p::before {
    content: '♪';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* 优秀学员 */
.testimonials {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}

.testimonial-card {
    width: 350px;
    background-color: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    position: relative;
}

.testimonial-card::before {
    content: "\201C";
    position: absolute;
    top: 15px;
    left: 15px;
    font-size: 5rem;
    color: var(--secondary-color);
    opacity: 0.1;
    z-index: 0;
    font-family: serif;
}

.testimonial-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.testimonial-content {
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.testimonial-content p {
    font-style: italic;
    position: relative;
    padding: 0 20px;
}

.testimonial-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: relative;
    z-index: 1;
}

.testimonial-info h4 {
    margin-bottom: 5px;
    color: var(--primary-color);
    position: relative;
    display: inline-block;
}

.testimonial-info h4::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.testimonial-card:hover .testimonial-info h4::after {
    width: 100%;
}

/* 乐谱下载 */
.sheet-music-controls {
    margin-bottom: 30px;
}

.sheet-search {
    display: flex;
    margin-bottom: 20px;
    max-width: 500px;
    margin: 0 auto 25px;
}

.sheet-search input {
    flex: 1;
    padding: 12px 15px;
    border: none;
    border-radius: 30px 0 0 30px;
    font-size: 1rem;
    outline: none;
}

.sheet-search button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0 20px;
    border-radius: 0 30px 30px 0;
    cursor: pointer;
    transition: var(--transition);
}

.sheet-search button:hover {
    background-color: var(--secondary-color);
}

.sheet-categories {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin: 25px auto;
}

.sheet-category-btn {
    padding: 8px 15px;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.sheet-category-btn:hover,
.sheet-category-btn.active {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

.sheet-music-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
}

.sheet-music-card {
    width: 150px;
    height: 180px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    --mouse-x: 0px;
    --mouse-y: 0px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 15px;
}

.sheet-music-card:hover {
    transform: translateY(-5px);
    background-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.sheet-music-icon {
    font-size: 3rem;
    color: var(--secondary-color);
    margin-bottom: 15px;
    transition: var(--transition);
}

.sheet-music-card:hover .sheet-music-icon {
    transform: scale(1.1);
    color: white;
}

.sheet-music-info h3 {
    font-size: 1rem;
    margin-bottom: 5px;
    color: white;
    transition: var(--transition);
}

.sheet-music-info p {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 15px;
}

.sheet-music-info .download-btn {
    color: var(--secondary-color);
    font-size: 1.2rem;
    transition: var(--transition);
}

.sheet-music-card:hover .download-btn {
    color: white;
    transform: scale(1.2);
}

.sheet-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-top: 30px;
}

.pagination-btn {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
}

.pagination-btn:hover {
    background-color: var(--secondary-color);
}

.pagination-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.pagination-numbers {
    display: flex;
    gap: 5px;
}

.page-number {
    width: 35px;
    height: 35px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    cursor: pointer;
    transition: var(--transition);
}

.page-number:hover,
.page-number.active {
    background-color: var(--secondary-color);
}

/* 演奏视频 */
.videos-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 30px;
}

.video-card {
    width: 300px;
    background-color: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
}

.video-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.video-thumbnail {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.1);
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
    overflow: hidden;
}

.play-button::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.3);
    transform: scale(0);
    border-radius: 50%;
    transition: transform 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.play-button i {
    color: white;
    font-size: 1.5rem;
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.video-card:hover .play-button {
    background-color: var(--primary-color);
    transform: translate(-50%, -50%) scale(1.1);
}

.video-card:hover .play-button::before {
    transform: scale(1.5);
    opacity: 0;
}

.video-card:hover .play-button i {
    transform: scale(1.2);
}

.video-info {
    padding: 20px;
}

.video-info h3 {
    margin-bottom: 10px;
    color: var(--tertiary-color);
    transition: var(--transition);
}

.video-card:hover .video-info h3 {
    color: var(--primary-color);
}

.video-info p {
    color: #777;
}

/* 联系我们 */
.contact-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 40px;
}

.contact-info,
.contact-form {
    flex: 1;
    min-width: 300px;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateX(5px);
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-right: 15px;
    transition: var(--transition);
}

.contact-item:hover i {
    transform: scale(1.2);
}

.contact-form h3 {
    margin-bottom: 20px;
    color: var(--primary-color);
    position: relative;
    display: inline-block;
}

.contact-form h3::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 50px;
    height: 2px;
    background-color: var(--primary-color);
}

.form-group {
    margin-bottom: 20px;
    position: relative;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
    font-size: 16px;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 5px rgba(140, 85, 67, 0.3);
}

.form-group input:focus + .focus-border,
.form-group select:focus + .focus-border,
.form-group textarea:focus + .focus-border {
    transform: scaleX(1);
}

.focus-border {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

/* 个人中心 */
.profile-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 40px;
}

.profile-login,
.profile-features {
    flex: 1;
    min-width: 300px;
}

.profile-login {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(5px);
    transition: var(--transition);
}

.profile-login:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.profile-login h3 {
    margin-bottom: 20px;
    color: white;
    text-align: center;
    position: relative;
}

.profile-login h3::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background-color: var(--secondary-color);
}

.form-link {
    margin-top: 15px;
    text-align: center;
}

.form-link a {
    color: var(--secondary-color);
    font-weight: 600;
    transition: var(--transition);
}

.form-link a:hover {
    color: white;
    text-decoration: underline;
}

.profile-features {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
}

.feature-card {
    flex: 1;
    min-width: 150px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    transition: var(--transition);
    backdrop-filter: blur(5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.feature-card:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.feature-icon {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 15px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.2);
    color: white;
}

.feature-card h3 {
    margin-bottom: 10px;
    color: white;
}

.feature-card p {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.8);
}

/* 页脚 */
.footer {
    background-color: var(--tertiary-color);
    color: var(--light-color);
    padding: 40px 0 20px;
    position: relative;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 30px;
}

.footer-logo,
.footer-links,
.footer-contact,
.footer-social {
    flex: 1;
    min-width: 200px;
    margin-bottom: 20px;
}

.footer-logo h2 {
    margin-bottom: 10px;
    color: var(--secondary-color);
    font-size: 1.8rem;
    position: relative;
    display: inline-block;
}

.footer-logo h2::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--secondary-color);
}

.footer-links h3,
.footer-contact h3,
.footer-social h3 {
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
}

.footer-links h3::after,
.footer-contact h3::after,
.footer-social h3::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--secondary-color);
}

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

.footer-links li {
    margin-bottom: 10px;
    transition: var(--transition);
}

.footer-links li:hover {
    transform: translateX(5px);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
    position: relative;
    display: inline-block;
    padding-left: 15px;
}

.footer-links a::before {
    content: '♪';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--secondary-color);
    font-size: 0.8rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--secondary-color);
}

.footer-links a:hover::before {
    transform: scale(1.2);
}

.footer-contact p {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.footer-contact p:hover {
    transform: translateX(5px);
}

.footer-contact i {
    margin-right: 10px;
    color: var(--secondary-color);
    transition: var(--transition);
}

.footer-contact p:hover i {
    transform: scale(1.2);
}

.social-icons {
    display: flex;
    gap: 15px;
}

.social-icons a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.social-icons a::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    top: 0;
    left: 0;
    transform: scale(0);
    transition: transform 0.3s ease;
    border-radius: 50%;
}

.social-icons a i {
    position: relative;
    z-index: 1;
    transition: var(--transition);
}

.social-icons a:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.social-icons a:hover::before {
    transform: scale(1);
}

.social-icons a:hover i {
    transform: scale(1.2);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* 动画 */
@keyframes fadeInUp {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

/* 响应式设计 */
@media screen and (max-width: 1024px) {
    :root {
        --navbar-height: 70px;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .about-text h3,
    .facility-text h3 {
        font-size: 1.8rem;
    }
    
    .hero-content h1 {
        font-size: 3rem;
    }
    
    .teacher-profile-content {
        flex-direction: column;
        align-items: center;
    }
    
    .teacher-profile-image {
        width: 100%;
        max-width: 350px;
    }
    
    .course-card {
        width: 45%;
        min-width: 280px;
    }
    
    .course-card.expanded {
        width: 100%;
    }
    
    .features-section {
        padding: 40px 0;
    }
    
    .feature-box {
        padding: 25px;
    }
    
    .feature-box h3 {
        font-size: 1.6rem;
    }
}

@media screen and (max-width: 768px) {
    :root {
        --navbar-height: 60px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .section-fullheight {
        padding: calc(var(--navbar-height) + 10px) 0 30px;
    }
    
    .section-title {
        font-size: 2rem;
        margin-bottom: 40px;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-content p {
        font-size: 1.1rem;
    }
    
    .menu-toggle {
        display: block;
        z-index: 1001;
        position: relative;
        width: 35px;
        height: 35px;
        cursor: pointer;
        padding: 5px;
        background-color: rgba(255, 255, 255, 0.2);
        border-radius: 50%;
        transition: all 0.3s ease;
    }
    
    .menu-toggle:hover {
        background-color: rgba(140, 85, 67, 0.1);
    }
    
    .menu-toggle .bar {
        width: 25px;
        height: 2px;
        background-color: var(--primary-color);
        margin: 6px auto;
        transition: var(--transition);
        display: block;
        border-radius: 1px;
    }
    
    .menu-toggle.active {
        background-color: rgba(140, 85, 67, 0.2);
    }
    
    .menu-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
        background-color: var(--primary-color);
    }
    
    .menu-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .menu-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
        background-color: var(--primary-color);
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        height: 100vh;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 90px 0 40px;
        transition: all 0.5s ease;
        z-index: 999;
        overflow-y: auto;
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.1);
        display: flex;
        align-items: center;
        justify-content: flex-start;
    }
    
    .nav-menu::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: linear-gradient(135deg, 
            rgba(140, 85, 67, 0.05) 0%, 
            rgba(212, 180, 131, 0.05) 50%, 
            rgba(255, 255, 255, 0.05) 100%);
        z-index: -1;
    }
    
    .nav-menu::after {
        content: '♪';
        position: absolute;
        bottom: 30px;
        right: 30px;
        font-size: 40px;
        color: var(--primary-color);
        opacity: 0.1;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-link {
        margin: 10px 0;
        padding: 12px 20px;
        font-size: 1.1rem;
        letter-spacing: 1px;
        width: 100%;
        text-align: center;
        color: var(--tertiary-color);
        border-left: 3px solid transparent;
        transition: all 0.3s ease;
        position: relative;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .nav-link::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 0;
        height: 100%;
        background-color: rgba(140, 85, 67, 0.08);
        transition: width 0.4s ease;
        z-index: -1;
    }
    
    .nav-link:hover::before,
    .nav-link.active::before {
        width: 100%;
    }
    
    .nav-link::after {
        content: '♪';
        position: absolute;
        right: 20px;
        font-size: 0;
        color: var(--primary-color);
        transition: all 0.3s ease;
        opacity: 0;
    }
    
    .nav-link:hover::after,
    .nav-link.active::after {
        font-size: 16px;
        opacity: 1;
    }
    
    .nav-link.active {
        color: var(--primary-color);
        border-left: 3px solid var(--primary-color);
        font-weight: 500;
    }
    
    .about-image, 
    .about-text,
    .facility-image,
    .facility-text {
        flex: 100%;
        text-align: center;
    }
    
    .about-image img,
    .facility-image img {
        max-width: 80%;
    }
    
    .teacher-card,
    .testimonial-card,
    .video-card {
        width: 100%;
        max-width: 400px;
    }
    
    .logo-img {
        height: 50px;
    }
    
    .navbar.scrolled .logo-img {
        height: 40px;
    }
    
    .teacher-profile-content {
        padding: 20px;
        gap: 20px;
        flex-direction: column;
        text-align: center;
    }
    
    .teacher-profile-image {
        max-width: 250px;
        margin: 0 auto 20px;
        order: 1;
    }
    
    .teacher-profile-info {
        width: 100%;
        min-width: auto;
        text-align: center;
        order: 2;
    }
    
    .teacher-profile-text {
        max-height: none;
        overflow-y: visible;
        padding-right: 0;
        text-align: left;
    }
    
    .course-card {
        width: 100%;
        max-width: 350px;
    }
    
    .course-card.expanded .course-detail {
        max-height: 50vh;
    }
    
    .features-section {
        padding: 30px 0;
        flex-direction: column;
        align-items: center;
    }
    
    .feature-box {
        width: 90%;
        max-width: 400px;
    }
}

@media screen and (max-width: 480px) {
    :root {
        --navbar-height: 50px;
    }

    .section-fullheight {
        padding: calc(var(--navbar-height) + 10px) 0 20px;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .about-text h3,
    .facility-text h3 {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: 10px 25px;
    }
    
    .footer-content {
        flex-direction: column;
    }
    
    .footer-logo,
    .footer-links,
    .footer-contact,
    .footer-social {
        width: 100%;
        margin-bottom: 40px;
    }
    
    .logo-img {
        height: 40px;
    }
    
    .navbar.scrolled .logo-img {
        height: 35px;
    }
    
    .teacher-profile-info h3 {
        font-size: 1.5rem;
    }
    
    .teacher-profile-text h4 {
        font-size: 1.1rem;
    }
    
    .course-card.expanded .course-detail {
        max-height: 60vh;
    }
    
    .features-section {
        padding: 20px 0;
    }
    
    .feature-box {
        padding: 20px;
        width: 95%;
    }
    
    .feature-box h3 {
        font-size: 1.4rem;
    }
    
    .feature-box .feature-icon {
        font-size: 2.5rem;
    }
    
    .teacher-profile-image {
        max-width: 180px;
    }
}

/* 演奏视频时间线样式 */
.timeline-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px 0;
}

.timeline {
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 120px;
    height: 100%;
    width: 4px;
    background: var(--primary-color);
    opacity: 0.7;
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
    display: flex;
}

.timeline-date {
    position: relative;
    width: 120px;
    padding-right: 20px;
    text-align: right;
    flex-shrink: 0;
}

.date-inner {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.date-inner .month {
    font-size: 0.9rem;
    color: #666;
}

.date-inner .day {
    font-size: 1.8rem;
    font-weight: 700;
    line-height: 1;
    color: var(--primary-color);
}

.date-inner .year {
    font-size: 1rem;
    color: #666;
}

.timeline-content {
    position: relative;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
    padding: 20px;
    margin-left: 30px;
    flex-grow: 1;
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: 20px;
    left: -36px;
    width: 16px;
    height: 16px;
    border: 4px solid var(--primary-color);
    border-radius: 50%;
    background: white;
    z-index: 1;
}

.timeline-content::after {
    content: '';
    position: absolute;
    top: 25px;
    left: -20px;
    width: 20px;
    height: 20px;
    background: white;
    transform: rotate(45deg);
    box-shadow: -3px 3px 10px rgba(0, 0, 0, 0.05);
}

.timeline-content h3 {
    margin-top: 0;
    margin-bottom: 10px;
    color: var(--primary-color);
    font-size: 1.3rem;
}

.concert-location {
    margin-bottom: 15px;
    color: #666;
    font-size: 0.9rem;
}

.concert-location i {
    margin-right: 5px;
    color: var(--primary-color);
}

.video-thumbnail {
    position: relative;
    width: 100%;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 15px;
    cursor: pointer;
    transition: transform 0.3s;
}

.video-thumbnail:hover {
    transform: scale(1.02);
}

.video-thumbnail img {
    width: 100%;
    display: block;
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(0, 0, 0, 0.7);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    transition: background 0.3s;
}

.video-thumbnail:hover .play-button {
    background: var(--primary-color);
}

.concert-description {
    margin-bottom: 15px;
    line-height: 1.5;
    color: #333;
}

.concert-details {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: #666;
}

.concert-details span {
    margin-right: 15px;
}

.concert-details i {
    margin-right: 5px;
    color: var(--primary-color);
}

.timeline-more {
    text-align: center;
    margin-top: 30px;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item {
        flex-direction: column;
    }
    
    .timeline-date {
        width: auto;
        text-align: left;
        padding-left: 60px;
        margin-bottom: 10px;
    }
    
    .date-inner {
        flex-direction: row;
        align-items: center;
    }
    
    .date-inner .month,
    .date-inner .year {
        margin: 0 5px;
    }
    
    .timeline-content {
        margin-left: 60px;
    }
    
    .timeline-content::before {
        left: -46px;
    }
    
    .timeline-content::after {
        left: -10px;
    }
    
    .concert-details {
        flex-direction: column;
    }
    
    .concert-details span {
        margin-bottom: 5px;
    }
}

/* 乐谱和视频功能区 */
.features-section {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
    padding: 60px 0;
}

.feature-box {
    flex: 1;
    min-width: 280px;
    max-width: 500px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    transition: var(--transition);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.feature-box:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
    background-color: rgba(255, 255, 255, 0.15);
}

.feature-box .feature-icon {
    font-size: 3rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.feature-box h3 {
    font-size: 1.8rem;
    color: white;
    margin-bottom: 15px;
}

.feature-box p {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 25px;
    line-height: 1.6;
}

.feature-box .btn {
    margin-top: 10px;
    border-color: white;
    color: white;
}

.feature-box .btn:hover {
    background-color: white;
    color: var(--tertiary-color);
}

/* 子页面样式 */
.page-header {
    position: relative;
    padding: 120px 0 60px;
    text-align: center;
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('../images/piano0.png');
    background-size: cover;
    background-position: center;
    color: white;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.page-header p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
}

@media screen and (max-width: 768px) {
    .page-header {
        padding: 100px 0 40px;
    }
    
    .page-header h1 {
        font-size: 2.2rem;
    }
    
    .page-header p {
        font-size: 1rem;
    }
}

@media screen and (max-width: 480px) {
    .page-header {
        padding: 90px 0 30px;
    }
    
    .page-header h1 {
        font-size: 1.8rem;
    }
}

/* 页面滚动控制 - 移动端菜单打开时 */
body.menu-open {
    position: fixed;
    width: 100%;
    height: 100%;
}

/* 艺术导航效果 */
.mobile-nav-art {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: -1;
}

.mobile-nav-art::before {
    content: '';
    position: absolute;
    top: 30%;
    left: 60%;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--secondary-color) 0%, rgba(212, 180, 131, 0) 70%);
    opacity: 0.1;
}

.mobile-nav-art::after {
    content: '';
    position: absolute;
    bottom: 20%;
    right: 30%;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--primary-color) 0%, rgba(140, 85, 67, 0) 70%);
    opacity: 0.1;
}

/* 动画效果 */
@keyframes navItemFade {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* 移动导航项动画 */
.nav-menu.active .nav-link {
    animation: navItemFade 0.5s ease forwards;
    opacity: 0;
}

/* 更多响应式优化 */
@media screen and (max-width: 480px) {
    .navbar {
        padding: 10px 4%;
    }
    
    .logo-img {
        height: 38px;
    }
    
    .nav-menu {
        width: 85%;
    }
    
    .nav-link {
        font-size: 1rem;
        padding: 10px 15px;
    }
    
    /* 优化超小屏幕 */
    @media screen and (max-height: 500px) {
        .nav-menu {
            padding-top: 70px;
        }
        
        .nav-link {
            margin: 5px 0;
            padding: 8px 15px;
        }
    }
}

/* 课程弹窗样式 */
.course-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.course-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.course-modal {
    background: white;
    width: 90%;
    max-width: 800px;
    max-height: 80vh;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.3);
    position: relative;
    overflow-y: auto;
    transform: translateY(30px);
    transition: all 0.4s ease;
}

.course-modal-overlay.active .course-modal {
    transform: translateY(0);
}

.course-modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 1.5rem;
    color: var(--tertiary-color);
    background: none;
    border: none;
    cursor: pointer;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.course-modal-close:hover {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--primary-color);
}

.course-modal-header {
    margin-bottom: 20px;
    text-align: center;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.course-modal-header h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.course-modal-icon {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.course-modal-content h4 {
    color: var(--primary-color);
    font-size: 1.3rem;
    margin: 20px 0 10px;
    padding-left: 20px;
    position: relative;
}

.course-modal-content h4::before {
    content: '♪';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
}

.course-modal-content ul {
    margin-bottom: 15px;
    list-style-type: none;
}

.course-modal-content li {
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
}

.course-modal-content li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
}

.course-modal-content p {
    margin-bottom: 15px;
    line-height: 1.6;
}

body.modal-open {
    overflow: hidden;
}

@media screen and (max-width: 768px) {
    .course-modal {
        padding: 20px;
        width: 95%;
    }
    
    .course-modal-header h3 {
        font-size: 1.5rem;
    }
    
    .course-modal-icon {
        font-size: 2rem;
    }
    
    .course-modal-content h4 {
        font-size: 1.2rem;
    }
}

@media screen and (max-width: 480px) {
    .course-modal {
        padding: 15px;
        max-height: 85vh;
    }
    
    .course-modal-header h3 {
        font-size: 1.3rem;
    }
    
    .course-modal-icon {
        font-size: 1.8rem;
    }
    
    .course-modal-close {
        top: 10px;
        right: 10px;
        font-size: 1.2rem;
    }
}