/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 根变量定义 */
:root {
    /* 主题色调 - 使用红色系 */
    --primary-color: #e53935;
    --primary-light: #ff6f60;
    --primary-dark: #ab000d;
    
    /* 辅助色调 */
    --secondary-color: #455a64;
    --secondary-light: #718792;
    --secondary-dark: #1c313a;
    
    /* 中性色调 */
    --background-color: #fafafa;
    --text-color: #333333;
    --gray-light: #f5f5f5;
    --gray-medium: #e0e0e0;
    --gray-dark: #757575;
    
    /* 功能色 */
    --success-color: #43a047;
    --warning-color: #fb8c00;
    --error-color: #d32f2f;
    
    /* 布局参数 */
    --max-width: 1200px;
    --border-radius: 8px;
    --box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 基础样式 */
body {
    font-family: "思源黑体", "Roboto", sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

/* 导航栏样式 */
.nav-bar {
    background-color: var(--primary-color);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

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

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary-light);
}

.nav-menu a.active {
    border-bottom: 2px solid white;
}

/* 主要内容区样式 */
main {
    margin-top: 4rem;
    padding: 2rem 1rem;
}

/* 头部横幅样式 */
.hero {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 4rem 1rem;
    text-align: center;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
}

.hero-content {
    max-width: var(--max-width);
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

/* 计算器部分样式 */
.calculator-section {
    max-width: 600px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: var(--gray-light);
    border-radius: var(--border-radius);
}

.calculator {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-weight: 500;
}

.input-group input {
    padding: 0.5rem;
    border: 1px solid var(--gray-medium);
    border-radius: 4px;
    font-size: 1rem;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

button:hover {
    background-color: var(--primary-light);
    transform: translateY(-1px);
}

.result {
    text-align: center;
    font-size: 1.2rem;
    font-weight: 500;
}

/* 特点部分样式 */
.features {
    max-width: var(--max-width);
    margin: 3rem auto;
    padding: 0 1rem;
}

.features h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--gray-light);
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* 反馈表单样式 */
.feedback-form {
    max-width: 600px;
    margin: 3rem auto;
    padding: 2rem;
    background-color: var(--gray-light);
    border-radius: var(--border-radius);
}

.feedback-form h2 {
    text-align: center;
    margin-bottom: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--gray-medium);
    border-radius: 4px;
    font-size: 1rem;
}

/* 页脚样式 */
footer {
    background-color: var(--gray-light);
    padding: 3rem 1rem 1rem;
    margin-top: 3rem;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-color);
    text-decoration: none;
}

.footer-section a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    max-width: var(--max-width);
    margin: 2rem auto 0;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-medium);
    text-align: center;
    font-size: 0.9rem;
    color: #666;
}

/* 响应式布局 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
}

/* 内容区域样式 */
.content-section {
    max-width: var(--max-width);
    margin: 2rem auto;
    padding: 0 1rem;
}

.content-container {
    background-color: var(--background-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.content-container h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

/* 信息卡片样式 */
.info-card {
    background-color: var(--gray-light);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
}

.info-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.info-card ul {
    list-style: none;
    padding-left: 1.5rem;
}

.info-card ul li {
    margin-bottom: 0.5rem;
    position: relative;
}

.info-card ul li:before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: -1.5rem;
}

/* 分数表格样式 */
.score-table {
    overflow-x: auto;
    margin: 1.5rem 0;
}

.score-table table {
    width: 100%;
    border-collapse: collapse;
    background-color: white;
}

.score-table th,
.score-table td {
    padding: 1rem;
    text-align: center;
    border: 1px solid var(--gray-medium);
}

.score-table th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
}

.score-table tr:nth-child(even) {
    background-color: var(--gray-light);
}

/* 分数段分析样式 */
.score-analysis {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.analysis-card {
    background-color: var(--gray-light);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}

.analysis-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.analysis-card ul {
    list-style: none;
    padding-left: 1.5rem;
}

.analysis-card ul li {
    margin-bottom: 0.5rem;
    position: relative;
}

.analysis-card ul li:before {
    content: "✓";
    color: var(--primary-color);
    position: absolute;
    left: -1.5rem;
}

/* 案例研究样式 */
.case-study {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--gray-medium);
}

.case-study:last-child {
    border-bottom: none;
}

.case-study h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.case-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.case-details,
.case-analysis,
.improvement-strategy {
    background-color: var(--gray-light);
    padding: 1.5rem;
    border-radius: var(--border-radius);
}

.case-details {
    border-left: 4px solid var(--primary-color);
}

.case-analysis {
    border-left: 4px solid var(--secondary-color);
}

.improvement-strategy {
    border-left: 4px solid #4CAF50;
}

.case-details h3,
.case-analysis h3,
.improvement-strategy h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.case-details ul,
.case-analysis ul,
.improvement-strategy ul {
    list-style: none;
    padding-left: 1.5rem;
}

.case-details ul li,
.case-analysis ul li,
.improvement-strategy ul li {
    margin-bottom: 0.5rem;
    position: relative;
}

.case-details ul li:before,
.case-analysis ul li:before,
.improvement-strategy ul li:before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: -1.5rem;
}

/* 通用提示样式 */
.general-tips {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 2px solid var(--gray-medium);
}

.general-tips h2 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.tip-card {
    background-color: var(--gray-light);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border-top: 4px solid var(--primary-color);
}

.tip-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    text-align: center;
}

.tip-card ul {
    list-style: none;
    padding-left: 1.5rem;
}

.tip-card ul li {
    margin-bottom: 0.5rem;
    position: relative;
}

.tip-card ul li:before {
    content: "✓";
    color: var(--primary-color);
    position: absolute;
    left: -1.5rem;
}

/* 音频播放器样式 */
.audio-player {
    background: var(--gray-light);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin: 1.5rem 0;
}

.audio-player h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.player-controls {
    width: 100%;
}

.custom-player {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.play-btn {
    background: var(--primary-color);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: background-color 0.3s;
}

.play-btn:hover {
    background: var(--primary-light);
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: #e0e0e0;
    border-radius: 4px;
    position: relative;
    cursor: pointer;
}

.progress {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: var(--primary-color);
    border-radius: 4px;
    width: 0;
}

.time {
    font-size: 0.9rem;
    color: var(--text-color);
    min-width: 100px;
    text-align: right;
}

/* 练习页面样式 */
.practice-section {
    padding: 2rem 0;
    background-color: #f8f9fa;
}

.practice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 2rem;
}

.practice-card {
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    padding: 1.5rem;
    transition: transform 0.3s ease;
}

.practice-card:hover {
    transform: translateY(-5px);
}

.practice-info h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
}

.practice-description {
    color: #666;
    margin-bottom: 1.5rem;
}

.practice-description ul {
    margin-top: 0.5rem;
    padding-left: 1.5rem;
}

.practice-description li {
    margin-bottom: 0.3rem;
    color: #555;
}

.practice-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.practice-meta span {
    background: #f0f2f5;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.9rem;
    color: #666;
}

.practice-actions {
    text-align: center;
}

.start-btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: #4CAF50;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.start-btn:hover {
    background: #45a049;
}

.coming-soon {
    opacity: 0.7;
    position: relative;
}

.coming-soon::after {
    content: "即将推出";
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: #ffc107;
    color: #000;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
}

/* 导航栏样式更新 */
.nav-menu .active {
    color: #4CAF50;
    font-weight: bold;
}

/* Logo样式 */
.logo-img {
    height: 40px;
    margin-right: 10px;
    vertical-align: middle;
}

.home-link {
    text-decoration: none;
    color: inherit;
    display: flex;
    align-items: center;
}

/* 卡片样式 */
.card {
    border-left: 4px solid var(--primary-color);
}

/* 表格样式 */
.table th {
    background-color: var(--primary-color);
    color: white;
}

/* 链接样式 */
a {
    color: var(--primary-color);
}

a:hover {
    color: var(--primary-light);
}