/* 全局样式 */
:root {
    --primary-color: #4A90E2;
    --secondary-color: #2C5282;
    --accent-color: #63B3ED;
    --text-color: #2D3748;
    --light-gray: #EBF8FF;
    --white: #ffffff;
    --background-color: #F7FAFD;
    --card-shadow: 0 4px 16px rgba(74,144,226,0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

/* 导航栏样式 */
header {
    background: var(--background-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo h1 {
    font-size: 1.2rem;
    color: var(--primary-color);
}

.nav-links {
    display: none;
}

.mobile-menu {
    display: block;
    font-size: 1.5rem;
    color: var(--primary-color);
    cursor: pointer;
}

/* 主要内容样式 */
main {
    margin-top: 60px;
    padding: 0;
    background: var(--background-color);
}

.hero {
    text-align: center;
    padding: 1.5rem 1rem;
    background: linear-gradient(135deg, #F7FAFD 0%, #EBF8FF 100%);
    margin-bottom: 1rem;
}

.hero-content h1 {
    font-size: 1.6rem;
    margin-bottom: 0.8rem;
    color: var(--secondary-color);
}

.hero-content p {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.cta-button {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: bold;
}

/* 功能卡片样式 */
.features {
    padding: 1rem;
}

.features h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 0.5rem;
}

.feature-card {
    background: var(--white);
    padding: 1.5rem 1rem;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    height: 130px;
    width: 100%;
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(74,144,226,0.15);
    background: var(--light-gray);
}

.feature-card i {
    font-size: 2.2rem;
    color: var(--primary-color);
    margin-bottom: 0.8rem;
    display: block;
}

.feature-card h3 {
    margin: 0;
    font-size: 1rem;
    line-height: 1.4;
    width: 100%;
}

@media (max-width: 480px) {
    .feature-grid {
        gap: 0.8rem;
        padding: 0 0.3rem;
    }
    
    .feature-card {
        height: 110px;
        padding: 0.8rem;
        min-width: 0;
    }
    
    .feature-card i {
        font-size: 1.8rem;
        margin-bottom: 0.5rem;
    }
    
    .feature-card h3 {
        font-size: 0.9rem;
        padding: 0 0.3rem;
    }
}

/* 指导部分样式 */
.guide {
    padding: 2rem 1rem;
    background: #f8f9fa;
}

.guide h2 {
    text-align: center;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.guide-subtitle {
    text-align: center;
    color: var(--primary-color);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.guide-container {
    max-width: 1200px;
    margin: 0 auto;
    height: 600px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

/* 即将推出部分样式 */
.coming-soon {
    padding: 2rem 1rem;
}

.coming-soon h2 {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.5rem;
}

.coming-soon-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.coming-soon-item {
    text-align: center;
    padding: 1.5rem;
}

.coming-soon-item i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* 页脚样式 */
footer {
    background: #2d3748;
    color: white;
    padding: 2rem 1rem;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.footer-section {
    text-align: center;
}

.footer-section h3 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 0.5rem;
}

.social-links a {
    color: white;
    font-size: 1.5rem;
}

.footer-bottom {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* 响应式设计 */
@media (min-width: 768px) {
    .nav-links {
        display: flex;
        gap: 2rem;
        align-items: center;
    }

    .nav-links a {
        color: var(--text-color);
        text-decoration: none;
        font-weight: 500;
    }

    .mobile-menu {
        display: none;
    }

    .feature-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .coming-soon-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .footer-content {
        flex-direction: row;
        justify-content: center;
        gap: 4rem;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .guide-container {
        height: 700px;
    }
}

/* 语言切换按钮样式 */
.lang-toggle {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
}

/* 移动端导航菜单 */
.mobile-nav {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    width: 100%;
    background: white;
    padding: 1rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.mobile-nav.active {
    display: block;
}

.mobile-nav a {
    display: block;
    padding: 1rem;
    color: var(--text-color);
    text-decoration: none;
    border-bottom: 1px solid #eee;
}

/* 微信特定样式 */
@media screen and (max-width: 768px) {
    body {
        -webkit-text-size-adjust: 100%;
    }
    
    .hero-content h1 {
        font-size: 1.5rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .feature-card {
        height: 120px;
        padding: 1rem;
    }
    
    .feature-card i {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }
    
    .feature-card h3 {
        font-size: 1rem;
    }
    
    .guide-container {
        height: 500px;
        border-radius: 0;
    }
}

/* Dify聊天机器人样式 */
#dify-chatbot-bubble-button {
    background-color: #1C64F2 !important;
}

#dify-chatbot-bubble-window {
    width: 24rem !important;
    height: 40rem !important;
}

@media (max-width: 768px) {
    #dify-chatbot-bubble-window {
        width: 100% !important;
        height: 100% !important;
        max-height: 100vh !important;
    }

    .guide-container {
        height: 600px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card,
.coming-soon-item {
    animation: fadeIn 0.5s ease-out;
}

.dify-chat {
    max-width: 600px;
    margin: 2rem auto 0 auto;
    background: #f5f5f5;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    min-height: 350px;
}
.dify-messages {
    flex: 1;
    overflow-y: auto;
    margin-bottom: 1rem;
    min-height: 200px;
}
.dify-message {
    margin-bottom: 0.75rem;
    line-height: 1.6;
}
.dify-message.user {
    text-align: right;
    color: #4A90E2;
}
.dify-message.bot {
    text-align: left;
    color: #222;
}
.dify-form {
    display: flex;
    gap: 0.5rem;
}
.dify-form input {
    flex: 1;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    border: 1px solid #ccc;
    font-size: 1rem;
}
.dify-form button {
    background: #4A90E2;
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 0 1.5rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.2s;
}
.dify-form button:hover {
    background: #357ABD;
}

/* 语言切换样式 */
.en {
    display: none;
}

body.en .en {
    display: block;
}

body.en .zh {
    display: none;
}

/* 药学科普讲堂样式 */
.science-content {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.science-content h1 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.tab-btn {
    background: white;
    border: none;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-color);
    box-shadow: var(--card-shadow);
    transition: all 0.3s ease;
}

.tab-btn i {
    font-size: 1.2rem;
    color: var(--primary-color);
}

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

.tab-btn.active i {
    color: white;
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

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

.info-card {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    margin-bottom: 1.5rem;
}

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

.info-card ul {
    list-style-type: none;
    padding: 0;
}

.info-card li {
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
}

.info-card li:before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

.info-card.warning {
    border-left: 4px solid #e53e3e;
}

.info-card.warning h3 {
    color: #e53e3e;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* 移动端适配 */
@media (max-width: 768px) {
    .science-content {
        margin: 1rem auto;
    }

    .tabs {
        gap: 0.5rem;
    }

    .tab-btn {
        padding: 0.8rem 1rem;
        font-size: 0.9rem;
    }

    .info-card {
        padding: 1rem;
    }
}