/* 汇率易 - 统一样式文件 */

/* CSS变量 */
:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

/* 布局容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部 */
header {
    background: white;
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

body {
    padding-top: 70px;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

.logo span {
    color: var(--secondary-color);
}

/* 导航 */
nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: var(--dark-color);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* 英雄区域 */
.hero {
    text-align: center;
    padding: 4rem 0;
    background: white;
    margin: 2rem 0;
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.hero p {
    font-size: 1.2rem;
    color: #666;
    max-width: 800px;
    margin: 0 auto 2rem;
}

/* 特性卡片 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s;
}

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

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

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

/* 计算器 */
.calculator {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin: 3rem 0;
}

.calculator h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--dark-color);
}

.calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

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

.input-group label {
    font-weight: 600;
    color: var(--dark-color);
}

select, input {
    padding: 0.75rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

select:focus, input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 结果 */
.result {
    text-align: center;
    padding: 2rem;
    background: var(--light-color);
    border-radius: 10px;
    margin-top: 2rem;
}

.result-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: 1rem 0;
}

/* 汇率表格 */
.exchange-rates {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin: 3rem 0;
}

.exchange-rates h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--dark-color);
}

.rates-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.rates-table th, .rates-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.rates-table th {
    background: var(--light-color);
    font-weight: 600;
}

.rate-change {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 3px;
    font-size: 0.9rem;
}

.positive {
    background: #d4edda;
    color: #155724;
}

.negative {
    background: #f8d7da;
    color: #721c24;
}

/* 内容区块 */
.content-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin: 2rem 0;
}

/* 法律页面内容 */
.content {
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin: 2rem 0;
}

.content h2 {
    color: var(--dark-color);
    margin: 2rem 0 1rem;
}

.content h3 {
    color: var(--dark-color);
    margin: 1.5rem 0 0.5rem;
}

.content p {
    line-height: 1.8;
    color: #555;
    margin-bottom: 1rem;
}

.content ul, .content ol {
    margin: 1rem 0 1rem 2rem;
}

.content li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
    color: #555;
}

.content-section h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--light-color);
}

.content-section h3 {
    color: var(--dark-color);
    margin: 1.5rem 0 0.5rem;
}

.content-section p {
    margin-bottom: 1rem;
    text-align: justify;
}

.content-section ul, .content-section ol {
    margin: 1rem 0 1rem 2rem;
}

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

/* 关于页面 - 特性网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.features-grid .feature-card {
    text-align: center;
    padding: 1.5rem;
    border-radius: 8px;
    background: #f8f9fa;
}

.features-grid .feature-icon {
    font-size: 2.5rem;
}

/* 返回按钮 */
.back-btn {
    display: inline-block;
    margin-top: 20px;
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background 0.3s;
}

.back-btn:hover {
    background: #2980b9;
}

/* 页脚 */
footer {
    background: var(--dark-color);
    color: white;
    padding: 3rem 0;
    margin-top: 4rem;
}

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

.footer-section h3 {
    margin-bottom: 1rem;
    color: var(--light-color);
}

.footer-section a {
    color: #bbb;
    text-decoration: none;
    display: block;
    margin-bottom: 0.5rem;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: white;
}

.copyright {
    text-align: center;
    padding-top: 2rem;
    margin-top: 2rem;
    border-top: 1px solid #444;
    color: #bbb;
}

/* 广告容器 */
.ad-container {
    margin: 2rem 0;
    text-align: center;
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 5px;
    border: 1px dashed #ddd;
}

/* 图表控件 */
.chart-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.chart-container {
    position: relative;
    height: 400px;
    width: 100%;
}

/* 最后更新日期 */
.last-updated {
    color: #7f8c8d;
    font-size: 0.9rem;
}

/* 响应式 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .calculator-grid {
        grid-template-columns: 1fr;
    }
}