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

:root {
    --primary-color: #2d5016;
    --secondary-color: #5a9e2f;
    --accent-color: #f4a460;
    --light-bg: #f5f5dc;
    --white: #ffffff;
    --text-dark: #333333;
    --text-light: #666666;
    --border-color: #e0e0d8;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--light-bg);
}

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

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

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

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

.nav-links a:hover {
    opacity: 0.8;
}

/* 首页横幅 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero .subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero .description {
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto 2rem;
    line-height: 1.8;
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    padding: 0.8rem 2rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
    display: inline-block;
}

.btn-primary {
    background: var(--accent-color);
    color: var(--text-dark);
}

.btn-primary:hover {
    background: #e8944f;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

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

/* 平台定位 */
.intro {
    padding: 4rem 0;
    background: var(--white);
}

.intro h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.intro p {
    max-width: 900px;
    margin: 0 auto 3rem;
    text-align: center;
    font-size: 1.1rem;
    line-height: 1.8;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    background: var(--light-bg);
    border-radius: 12px;
    transition: all 0.3s;
}

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

.feature-card .icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

/* 精油核心品类 */
.essential-oils {
    padding: 4rem 0;
    background: var(--light-bg);
}

.essential-oils h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.section-desc {
    text-align: center;
    max-width: 900px;
    margin: 0 auto 3rem;
    font-size: 1.1rem;
    line-height: 1.8;
}

/* 分类标签 */
.category-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.tab-btn {
    padding: 0.8rem 2rem;
    border: 2px solid var(--primary-color);
    background: var(--white);
    color: var(--primary-color);
    border-radius: 25px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s;
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--primary-color);
    color: var(--white);
}

.category-content {
    display: block;
}

.category-content.hidden {
    display: none;
}

.category-content h3 {
    text-align: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.category-content > p {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 2rem;
}

/* 精油卡片网格 */
.oil-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.oil-card {
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.oil-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.oil-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.oil-icon {
    font-size: 2.5rem;
}

.oil-header h4 {
    flex: 1;
    font-size: 1.3rem;
}

.oil-tag {
    background: var(--accent-color);
    color: var(--text-dark);
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 600;
}

.oil-body {
    padding: 1.5rem;
}

.oil-body p {
    margin-bottom: 1rem;
    line-height: 1.8;
}

.oil-body ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.oil-body li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* 搭配公式 */
.blending {
    padding: 4rem 0;
    background: var(--white);
}

.blending h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.formula-cards {
    display: grid;
    gap: 2rem;
    margin-top: 2rem;
}

.formula-card {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.formula-card h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.formula-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.formula-table th,
.formula-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.formula-table th {
    background: var(--primary-color);
    color: var(--white);
    font-weight: 600;
}

.formula-table tr:hover {
    background: rgba(90, 158, 47, 0.1);
}

.tip {
    background: #fff3cd;
    border-left: 4px solid var(--accent-color);
    padding: 1rem;
    margin-top: 1rem;
    border-radius: 4px;
}

.blend-examples {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.blend-item {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.1);
}

.blend-item h4 {
    color: var(--secondary-color);
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
}

.blend-item p {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* 安全须知 */
.safety {
    padding: 4rem 0;
    background: var(--light-bg);
}

.safety h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.safety-content {
    max-width: 900px;
    margin: 0 auto;
}

.safety-block {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.safety-block.warning {
    background: #fff3cd;
    border-left: 4px solid #ff9800;
}

.safety-block h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.safety-block ul {
    margin-left: 1.5rem;
}

.safety-block li {
    margin-bottom: 0.8rem;
    line-height: 1.8;
}

.correct {
    color: #28a745;
    font-weight: 600;
}

/* 提示框 */
.tip-box {
    background: #e8f5e9;
    border-left: 4px solid var(--secondary-color);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
}

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

.tip-box ul {
    margin-left: 1.5rem;
}

.tip-box li {
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

/* 页脚 */
.footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
}

.footer p {
    margin-bottom: 0.5rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero .subtitle {
        font-size: 1.2rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .oil-grid {
        grid-template-columns: 1fr;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .blend-examples {
        grid-template-columns: 1fr;
    }
    
    .category-tabs {
        flex-direction: column;
        align-items: center;
    }
}