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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

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

/* 导航栏 */
.navbar {
    background: #fff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
    color: #667eea;
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: #667eea;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    padding: 150px 0 100px;
    margin-top: 70px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    color: white;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    border: 2px solid rgba(255,255,255,0.3);
    transition: all 0.3s ease;
}

.cta-button:hover {
    background: rgba(255,255,255,0.3);
    transform: translateY(-2px);
}

/* 区域通用样式 */
.info-section, .calculator-section, .tips-section, .blog-preview {
    padding: 80px 0;
}

.calculator-section {
    background: #f8fafc;
}

.blog-preview {
    background: #fff;
}

/* 信息卡片 */
.info-card, .calculator, .tips {
    background: white;
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

.info-card h3, .tips h3 {
    color: #4a5568;
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.info-card ul {
    list-style: none;
}

.info-card li {
    padding: 10px 0;
    padding-left: 30px;
    position: relative;
    color: #718096;
    line-height: 1.6;
}

.info-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #38b2ac;
    font-weight: bold;
    font-size: 1.2rem;
}

/* 计算器样式 */
.calculator-section h2 {
    text-align: center;
    color: #4a5568;
    margin-bottom: 40px;
    font-size: 2.5rem;
}

.tabs {
    display: flex;
    margin-bottom: 30px;
    border-radius: 10px;
    overflow: hidden;
    background: #f7fafc;
}

.tab-btn {
    flex: 1;
    padding: 15px 20px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    color: #718096;
}

.tab-btn.active {
    background: #667eea;
    color: white;
}

.tab-btn:hover {
    background: rgba(102, 126, 234, 0.1);
}

.tab-btn.active:hover {
    background: #5a67d8;
}

.tab-content {
    display: none;
}

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

.current-time {
    text-align: center;
    margin-bottom: 30px;
    padding: 25px;
    background: #f7fafc;
    border-radius: 10px;
}

.current-time h3 {
    color: #4a5568;
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.current-time span {
    color: #667eea;
    font-weight: bold;
}

.input-group {
    margin-bottom: 25px;
}

.input-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: #4a5568;
    font-size: 1.1rem;
}

.input-group input {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 1.1rem;
    transition: border-color 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.calculate-btn {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-bottom: 30px;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.3);
}

.results {
    margin-top: 30px;
}

.results h4 {
    color: #4a5568;
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.result-item {
    background: #f7fafc;
    border-left: 4px solid #667eea;
    padding: 20px;
    margin-bottom: 15px;
    border-radius: 0 10px 10px 0;
    transition: all 0.3s ease;
}

.result-item:hover {
    background: #edf2f7;
    transform: translateX(5px);
}

.result-item.recommended {
    background: #e6fffa;
    border-left-color: #38b2ac;
    box-shadow: 0 5px 15px rgba(56, 178, 172, 0.1);
    position: relative;
}

.result-item.recommended::after {
    content: '⭐ 推荐';
    position: absolute;
    top: 15px;
    right: 15px;
    background: #38b2ac;
    color: white;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: bold;
}

.result-time {
    font-size: 1.6rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 5px;
}

.result-cycles {
    font-size: 1rem;
    color: #718096;
}

/* 建议区域 */
.tips {
    text-align: center;
    background: linear-gradient(135deg, #e6fffa 0%, #b2f5ea 100%);
}

.tips p {
    color: #2d3748;
    font-size: 1.1rem;
    font-style: italic;
}

/* 博客预览 */
.blog-preview h2 {
    text-align: center;
    color: #4a5568;
    margin-bottom: 50px;
    font-size: 2.5rem;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.blog-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

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

.blog-card h3 {
    color: #4a5568;
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.blog-card p {
    color: #718096;
    margin-bottom: 20px;
    line-height: 1.6;
}

.blog-card a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.blog-card a:hover {
    color: #5a67d8;
}

.blog-more {
    text-align: center;
    margin-top: 40px;
}

.more-articles-btn {
    display: inline-block;
    padding: 15px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.2);
}

.more-articles-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

/* 页脚 */
.footer {
    background: #2d3748;
    color: white;
    text-align: center;
    padding: 40px 0;
}

.footer p {
    opacity: 0.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .tabs {
        flex-direction: column;
    }
    
    .tab-btn:first-child {
        border-radius: 10px 10px 0 0;
    }
    
    .tab-btn:last-child {
        border-radius: 0 0 10px 10px;
    }
    
    .result-item {
        padding: 15px;
    }
    
    .result-item.recommended::after {
        position: static;
        display: block;
        margin-top: 10px;
        text-align: center;
    }
    
    .container {
        padding: 0 15px;
    }
}

/* 滚动行为 */
html {
    scroll-behavior: smooth;
}