/* 基础样式重置 - 基于Practice风格但颜色略深 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

body {
    background-color: #f5f3f3; /* 略深的背景色 */
    color: #444;
    min-height: 100vh;
    padding: 0;
    padding-top: 80px; /* 为固定导航栏留出空间 */
}

/* 重新设计的响应式导航栏 */
.header {
    background-color: #4a7694; /* 更深的蓝色 */
    color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    position: relative;
}

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

.logo {
    font-size: 1.4rem;
    font-weight: 400;
    margin: 0;
    color: white;
    white-space: nowrap;
}

/* 导航栏样式 */
.navbar {
    display: flex;
    align-items: center;
}

.nav-list {
    list-style: none;
    display: flex;
    gap: 15px;
    margin: 0;
    padding: 0;
}

.nav-list li a {
    color: white;
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 4px;
    transition: all 0.3s;
    font-size: 0.9rem;
    font-weight: 400;
    white-space: nowrap;
}

.nav-list li a:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.nav-list li a.active {
    background-color: rgba(255, 255, 255, 0.3);
    font-weight: 500;
}

/* 汉堡菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    width: 30px;
    height: 25px;
    justify-content: space-between;
}

.hamburger-line {
    width: 100%;
    height: 3px;
    background-color: white;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.hamburger-line.active:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

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

/* 移动设备导航列表激活状态 */
.nav-list.nav-active {
    display: flex !important;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: #4a7694;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
    z-index: 1001;
}

.nav-list.nav-active li {
    width: 100%;
    text-align: center;
}

.nav-list.nav-active li a {
    display: block;
    padding: 12px 15px;
    border-radius: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-list.nav-active li a:hover {
    background-color: rgba(255, 255, 255, 0.15);
}

/* 容器样式 - 基于Practice风格但颜色略深 */
.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
    margin-top: 20px;
    margin-bottom: 20px;
}

/* 页面标题样式 */
.page-header {
    text-align: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e0e0e0;
}

.page-header h1 {
    font-size: 2rem;
    margin-bottom: 8px;
    color: #4a7694; /* 更深的蓝色 */
    font-weight: 300;
}

.subtitle {
    font-size: 1rem;
    color: #777;
    font-weight: 300;
}

/* 主内容区域 */
.main-content {
    padding: 0 15px 15px;
}

/* 网站描述部分 - 主页专用 */
.site-description {
    background: linear-gradient(135deg, #6a94b2, #4a7694);
    color: white;
    text-align: center;
    padding: 40px 20px;
    margin-bottom: 20px;
    border-radius: 0;
}

.site-description h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    font-weight: 300;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.site-description p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
    opacity: 0.9;
}

/* 页面介绍部分 */
.page-intro {
    text-align: center;
    padding: 20px 0;
    margin-bottom: 15px;
}

.page-intro h2 {
    font-size: 1.7rem;
    margin-bottom: 10px;
    color: #4a7694; /* 更深的蓝色 */
    font-weight: 300;
}

.page-intro p {
    font-size: 1rem;
    color: #777;
    max-width: 700px;
    margin: 0 auto;
}

/* 英雄区域样式 */
.hero-section {
    display: flex;
    align-items: center;
    padding: 30px 0;
    gap: 30px;
}

.hero-content {
    flex: 1;
}

.hero-content h2 {
    font-size: 2rem;
    margin-bottom: 15px;
    color: #4a7694; /* 更深的蓝色 */
    font-weight: 300;
}

.hero-content p {
    font-size: 1rem;
    margin-bottom: 20px;
    color: #777;
}

.hero-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.hero-btn {
    display: inline-block;
    padding: 10px 20px;
    background: #4a7694; /* 更深的蓝色 */
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 400;
    font-size: 0.9rem;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.hero-btn:hover {
    background: #3a6684; /* 更深的悬停色 */
    transform: translateY(-2px);
    box-shadow: 0 3px 10px rgba(74, 118, 148, 0.4);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.music-staff {
    position: relative;
    width: 250px;
    height: 120px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    padding: 15px;
    border: 1px solid #e8e8e8;
}

.staff-line {
    height: 1px;
    background: #4a7694; /* 更深的蓝色 */
    margin: 12px 0;
}

.note {
    position: absolute;
    font-size: 1.5rem;
    color: #4a7694; /* 更深的蓝色 */
}

.note-1 {
    top: 15px;
    left: 40px;
}

.note-2 {
    top: 50px;
    left: 100px;
}

.note-3 {
    top: 85px;
    left: 160px;
}

/* 功能区域样式 */
.features-section {
    padding: 30px 0;
}

.section-title {
    color: #4a7694; /* 更深的蓝色 */
    margin-bottom: 20px;
    font-size: 1.5rem;
    position: relative;
    padding-bottom: 8px;
    text-align: center;
    font-weight: 300;
    border-bottom: 1px solid #e0e0e0;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: #4a7694; /* 更深的蓝色 */
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.feature-card {
    background: #f8f8f8; /* 略深的背景 */
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s;
    border: 1px solid #e8e8e8;
    border-top: 4px solid #4a7694; /* 更深的蓝色 */
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
    color: #4a7694; /* 更深的蓝色 */
}

.feature-card h3 {
    margin-bottom: 10px;
    color: #4a7694; /* 更深的蓝色 */
    font-size: 1.2rem;
    font-weight: 400;
}

.feature-card p {
    margin-bottom: 15px;
    color: #777;
    font-size: 0.9rem;
}

.feature-link {
    display: inline-block;
    color: #4a7694; /* 更深的蓝色 */
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.feature-link:hover {
    color: #3a6684; /* 更深的悬停色 */
}

/* 快速开始区域 */
.quick-start-section {
    padding: 30px 0;
}

.quick-start-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
}

.quick-start-card {
    background: #f8f8f8; /* 略深的背景 */
    border-radius: 10px;
    padding: 20px;
    border: 1px solid #e8e8e8;
}

.quick-start-card h3 {
    margin-bottom: 12px;
    color: #4a7694; /* 更深的蓝色 */
    font-size: 1.1rem;
    border-bottom: 2px solid #4a7694; /* 更深的蓝色 */
    padding-bottom: 8px;
    font-weight: 400;
}

.quick-start-card ul {
    list-style: none;
}

.quick-start-card li {
    margin-bottom: 8px;
}

.quick-start-card a {
    color: #555;
    text-decoration: none;
    transition: all 0.3s;
    display: block;
    padding: 6px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    font-size: 0.9rem;
}

.quick-start-card a:hover {
    color: #4a7694; /* 更深的蓝色 */
    padding-left: 8px;
}

/* 搜索区域 */
.search-section {
    padding: 15px 0;
}

.search-container {
    max-width: 800px;
    margin: 0 auto;
}

.search-box {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
}

.search-input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid #d0d0d0;
    border-radius: 6px;
    font-size: 14px;
    transition: all 0.3s;
    background: white;
}

.search-input:focus {
    outline: none;
    border-color: #4a7694; /* 更深的蓝色 */
    box-shadow: 0 0 0 3px rgba(74, 118, 148, 0.1);
}

.search-btn {
    padding: 12px 20px;
    background: #4a7694; /* 更深的蓝色 */
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    min-width: 110px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.search-btn:hover {
    background: #3a6684; /* 更深的悬停色 */
    transform: translateY(-2px);
    box-shadow: 0 3px 10px rgba(74, 118, 148, 0.4);
}

.search-tips {
    background: #f0f4f7; /* 略深的背景 */
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    color: #777;
    text-align: center;
    border: 1px solid #e0e0e0;
}

/* 快速操作区域 */
.quick-actions {
    margin-bottom: 20px;
}

.action-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
}

.action-card {
    background: #f8f8f8; /* 略深的背景 */
    border: 1px solid #e8e8e8;
    border-radius: 8px;
    padding: 15px 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.action-card:hover {
    border-color: #4a7694; /* 更深的蓝色 */
    transform: translateY(-2px);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
}

.card-icon {
    font-size: 1.8rem;
    margin-bottom: 8px;
    color: #4a7694; /* 更深的蓝色 */
}

.action-card h3 {
    margin-bottom: 5px;
    color: #555;
    font-size: 0.9rem;
    font-weight: 400;
}

/* 示例区域 */
.examples-section {
    margin-bottom: 20px;
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
    gap: 8px;
}

.example-item {
    padding: 10px 8px;
    background: #f0f4f7; /* 略深的背景 */
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s;
    border-left: 3px solid transparent;
    font-size: 0.85rem;
    text-align: center;
    border: 1px solid #e0e0e0;
}

.example-item:hover {
    background: #4a7694; /* 更深的蓝色 */
    color: white;
    border-left-color: #3a6684; /* 更深的悬停色 */
    transform: translateX(2px);
}

/* 乐理分类区域 */
.theory-categories {
    margin-bottom: 25px;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 15px;
}

.category-card {
    background: #f8f8f8; /* 略深的背景 */
    border-radius: 10px;
    padding: 20px 15px;
    text-align: center;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s;
    border: 1px solid #e8e8e8;
}

.category-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.category-card h3 {
    margin-bottom: 12px;
    color: #4a7694; /* 更深的蓝色 */
    font-size: 1.1rem;
    font-weight: 400;
}

.category-card p {
    margin-bottom: 15px;
    color: #777;
    font-size: 0.9rem;
}

.category-btn {
    padding: 8px 16px;
    background: #4a7694; /* 更深的蓝色 */
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.category-btn:hover {
    background: #3a6684; /* 更深的悬停色 */
}

/* 结果区域 */
.results-section {
    margin-bottom: 20px;
}

.results-container {
    min-height: 150px;
}

.welcome-card {
    background: linear-gradient(135deg, #6a94b2, #4a7694); /* 更深的渐变 */
    color: white;
    padding: 25px 20px;
    border-radius: 8px;
    text-align: center;
}

.welcome-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.welcome-card h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
    font-weight: 300;
}

.welcome-card p {
    font-size: 0.9rem;
}

/* 结果卡片样式 */
.result-card {
    background: #f8f8f8; /* 略深的背景 */
    border-radius: 8px;
    padding: 18px;
    margin-bottom: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    border-left: 4px solid #4a7694; /* 更深的蓝色 */
    transition: all 0.3s;
    border: 1px solid #e8e8e8;
}

.result-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.result-header {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
}

.result-icon {
    font-size: 1.3rem;
    margin-right: 10px;
    color: #4a7694; /* 更深的蓝色 */
}

.result-title {
    font-size: 1.1rem;
    color: #555;
    margin-bottom: 5px;
    font-weight: 400;
}

.result-content {
    line-height: 1.5;
    font-size: 0.9rem;
    color: #666;
}

.scale-notes {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin: 12px 0;
}

.note-item {
    background: #4a7694; /* 更深的蓝色 */
    color: white;
    padding: 6px 10px;
    border-radius: 5px;
    font-weight: 500;
    min-width: 35px;
    text-align: center;
    font-size: 0.9rem;
}

.scale-info {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid #e0e0e0;
}

.info-item {
    margin-bottom: 6px;
}

.info-label {
    font-weight: 500;
    color: #4a7694; /* 更深的蓝色 */
    font-size: 0.9rem;
}

/* 加载动画 */
.loading-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

/* 页脚样式 */
.footer {
    text-align: center;
    padding: 15px;
    color: #777;
    background: #f0f4f7; /* 略深的背景 */
    border-top: 1px solid #e0e0e0;
    font-size: 0.8rem;
    border-radius: 0 0 8px 8px;
}

/* 标签页样式 */
.search-tabs {
    display: flex;
    margin-bottom: 15px;
    border-bottom: 1px solid #e0e0e0;
}

.tab-button {
    padding: 10px 20px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    font-size: 0.9rem;
    font-weight: 500;
    color: #777;
    cursor: pointer;
    transition: all 0.3s;
}

.tab-button:hover {
    color: #4a7694; /* 更深的蓝色 */
}

.tab-button.active {
    color: #4a7694; /* 更深的蓝色 */
    border-bottom-color: #4a7694; /* 更深的蓝色 */
}

.tab-content {
    display: none;
}

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

/* 和弦分析结果样式 */
.analysis-results {
    margin-top: 15px;
}

.analysis-title {
    font-weight: 500;
    margin-bottom: 10px;
    color: #555;
}

.chord-result {
    background: #f0f4f7; /* 略深的背景 */
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 10px;
    border-left: 3px solid #4a7694; /* 更深的蓝色 */
    border: 1px solid #e0e0e0;
}

.chord-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.chord-header h4 {
    margin: 0;
    color: #555;
    font-size: 1rem;
    font-weight: 400;
}

.match-score {
    background: #4a7694; /* 更深的蓝色 */
    color: white;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}

.chord-notes-small {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin: 5px 0;
}

.note-item-small {
    background: #4a7694; /* 更深的蓝色 */
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: 500;
    font-size: 0.8rem;
}

.chord-formula {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    color: #777;
}

/* 乐理知识特定样式 */
.theory-info {
    margin-top: 15px;
}

.theory-info .info-item {
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #e0e0e0;
}

.theory-info .info-item:last-child {
    border-bottom: none;
}

.theory-info .info-label {
    font-weight: 500;
    color: #4a7694; /* 更深的蓝色 */
    display: block;
    margin-bottom: 5px;
    font-size: 0.9rem;
}

.theory-info p {
    margin: 0;
    line-height: 1.5;
    color: #666;
}

.examples-box {
    background: #f0f4f7; /* 略深的背景 */
    padding: 10px;
    border-radius: 8px;
    margin-top: 8px;
    border: 1px solid #e0e0e0;
}

.examples-box pre {
    margin: 0;
    white-space: pre-wrap;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    color: #666;
}

.category-items {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.category-item {
    background: #f0f4f7; /* 略深的背景 */
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    border-left: 3px solid transparent;
    border: 1px solid #e0e0e0;
}

.category-item:hover {
    background: #4a7694; /* 更深的蓝色 */
    color: white;
    border-left-color: #3a6684; /* 更深的悬停色 */
    transform: translateX(3px);
}

.category-item h4 {
    margin: 0 0 5px 0;
    font-size: 1rem;
    font-weight: 400;
}

.category-item p {
    margin: 0;
    font-size: 0.85rem;
    opacity: 0.8;
}

.related-results {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 2px solid #e0e0e0;
}

/* 选择器组样式 */
.selector-group {
    margin-bottom: 15px;
}

.selector-group label {
    display: block;
    margin-bottom: 5px;
    color: #555;
    font-weight: 500;
    font-size: 0.9rem;
}

.selector {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #d0d0d0;
    border-radius: 6px;
    background: white;
    color: #555;
    font-size: 0.9rem;
}

.selector:focus {
    outline: none;
    border-color: #4a7694; /* 更深的蓝色 */
    box-shadow: 0 0 0 3px rgba(74, 118, 148, 0.1);
}

.scale-selector {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 15px;
    align-items: end;
}

/* 音符快速输入 */
.quick-notes {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-top: 10px;
    align-items: center;
}

.notes-label {
    font-size: 0.85rem;
    color: #777;
    margin-right: 10px;
}

.note-btn {
    padding: 5px 10px;
    background: #f0f4f7; /* 略深的背景 */
    border: 1px solid #d0d0d0;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.3s;
    min-width: auto;
    flex: none;
}

.note-btn:hover {
    background: #4a7694; /* 更深的蓝色 */
    color: white;
    border-color: #4a7694; /* 更深的蓝色 */
}

/* 五度圈样式 */
.circle-of-fifths-container {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.circle-diagram {
    position: relative;
    width: 300px;
    height: 300px;
    border: 2px solid #4a7694; /* 更深的蓝色 */
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.circle-center {
    position: absolute;
    background: #4a7694; /* 更深的蓝色 */
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 500;
}

.circle-note {
    position: absolute;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
}

.circle-note.sharp {
    background: #6a94b2; /* 中等蓝色 */
    color: white;
}

.circle-note.flat {
    background: #8bb4c4; /* 浅蓝色 */
    color: #333;
}

.circle-note:hover {
    transform: scale(1.1);
}

.circle-controls {
    flex: 1;
}

.circle-info {
    margin-top: 15px;
    padding: 15px;
    background: #f0f4f7; /* 略深的背景 */
    border-radius: 8px;
    border: 1px solid #e0e0e0;
}

.circle-info h4 {
    margin: 0 0 10px 0;
    color: #4a7694; /* 更深的蓝色 */
    font-size: 1rem;
}

.circle-info p {
    margin: 5px 0;
    font-size: 0.85rem;
    color: #666;
}

/* 响应式设计 - 平板设备 */
@media (max-width: 992px) {
    .container {
        max-width: 95%;
    }
    
    .hero-section {
        flex-direction: column;
        text-align: center;
        padding: 25px 0;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .quick-start-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* .scale-selector {
        grid-template-columns: 1fr;
    } */
    
    .circle-of-fifths-container {
        flex-direction: column;
    }
    
    .circle-diagram {
        width: 250px;
        height: 250px;
        margin: 0 auto;
    }
}

/* 响应式设计 - 移动设备 */
@media (max-width: 768px) {
    body {
        padding: 8px;
        padding-top: 80px; /* 保持为固定导航栏留出空间 */
        font-size: 13px;
    }
    
    .container {
        border-radius: 10px;
        padding: 15px;
    }
    
    .main-header, .header {
        flex-direction: column;
        padding: 10px 15px;
        border-radius: 0;
    }
    
    .header-content {
        margin-bottom: 10px;
    }
    
    /* 移动设备导航栏样式 */
    .nav-toggle {
        display: flex;
    }
    
    .nav-list {
        display: none;
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .nav-list li a {
        padding: 6px 12px;
        font-size: 0.85rem;
    }
    
    .main-content {
        padding: 0 10px 10px;
    }
    
    .page-intro {
        padding: 15px 0;
    }
    
    .page-intro h2 {
        font-size: 1.4rem;
    }
    
    .page-intro p {
        font-size: 0.9rem;
    }
    
    .hero-section {
        padding: 20px 0;
        gap: 20px;
    }
    
    .hero-content h2 {
        font-size: 1.6rem;
    }
    
    .hero-content p {
        font-size: 0.9rem;
    }
    
    .hero-btn {
        padding: 8px 15px;
        font-size: 0.85rem;
    }
    
    .music-staff {
        width: 200px;
        height: 100px;
        padding: 12px;
    }
    
    .note {
        font-size: 1.2rem;
    }
    
    .note-1 {
        top: 12px;
        left: 30px;
    }
    
    .note-2 {
        top: 40px;
        left: 80px;
    }
    
    .note-3 {
        top: 68px;
        left: 130px;
    }
    
    .features-section {
        padding: 20px 0;
    }
    
    .section-title {
        font-size: 1.3rem;
        margin-bottom: 15px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .feature-card {
        padding: 15px;
    }
    
    .feature-icon {
        font-size: 2rem;
    }
    
    .feature-card h3 {
        font-size: 1.1rem;
    }
    
    .quick-start-section {
        padding: 20px 0;
    }
    
    .quick-start-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .quick-start-card {
        padding: 15px;
    }
    
    .search-box {
        flex-direction: column;
    }
    
    .search-btn {
        width: 100%;
    }
    
    .action-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .examples-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .welcome-card {
        padding: 20px 15px;
    }
    
    .welcome-icon {
        font-size: 2rem;
    }
    
    .welcome-card h3 {
        font-size: 1.2rem;
    }
    
    .result-card {
        padding: 15px;
    }
    
    .scale-notes {
        justify-content: center;
    }
    
    .search-tabs {
        flex-direction: column;
    }
    
    .tab-button {
        text-align: center;
        border-bottom: none;
        border-left: 3px solid transparent;
    }
    
    .tab-button.active {
        border-bottom: none;
        border-left-color: #4a7694; /* 更深的蓝色 */
    }
    
    .quick-notes {
        justify-content: center;
    }
    
    .circle-diagram {
        width: 200px;
        height: 200px;
    }
    
    .circle-note {
        width: 35px;
        height: 35px;
        font-size: 0.9rem;
    }
}

/* 响应式设计 - 小屏幕移动设备 */
@media (max-width: 480px) {
    body {
        padding: 5px;
        padding-top: 80px; /* 保持为固定导航栏留出空间 */
    }
    
    .container {
        border-radius: 8px;
        padding: 12px;
    }
    
    .main-header, .header {
        padding: 8px 12px;
    }
    
    .main-content {
        padding: 0 8px 8px;
    }
    
    .hero-content h2 {
        font-size: 1.4rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-btn {
        width: 100%;
        max-width: 200px;
        text-align: center;
    }
    
    .music-staff {
        width: 160px;
        height: 80px;
    }
    
    .staff-line {
        margin: 8px 0;
    }
    
    .note {
        font-size: 1rem;
    }
    
    .note-1 {
        top: 10px;
        left: 25px;
    }
    
    .note-2 {
        top: 32px;
        left: 65px;
    }
    
    .note-3 {
        top: 54px;
        left: 105px;
    }
    
    .action-grid {
        grid-template-columns: 1fr;
    }
    
    .examples-grid {
        grid-template-columns: 1fr;
    }
    
    .search-input, .search-btn {
        font-size: 13px;
    }
    
    .note-item {
        padding: 5px 8px;
        min-width: 30px;
        font-size: 0.8rem;
    }
    
    .circle-diagram {
        width: 180px;
        height: 180px;
    }
    
    .circle-note {
        width: 30px;
        height: 30px;
        font-size: 0.8rem;
    }
}

/* 响应式设计 - 超小屏幕设备 */
@media (max-width: 360px) {
    .hero-content h2 {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 1.1rem;
    }
    
    .feature-card h3 {
        font-size: 1rem;
    }
    
    .quick-start-card h3 {
        font-size: 1rem;
    }
    
    .category-card h3 {
        font-size: 1rem;
    }
    
    .nav-list {
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .nav-list li a {
        padding: 6px 12px;
        font-size: 0.85rem;
    }
}