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

:root {
    --primary-color: #1a5c7a;
    --secondary-color: #2d8bb4;
    --accent-color: #4da8c9;
    --text-dark: #2c3e50;
    --text-light: #666;
    --bg-light: #f5f7fa;
    --border-color: #e1e8ed;
    --success-color: #27ae60;
    --warning-color: #f39c12;
}

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

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

/* ========== 导航栏 ========== */
.navbar {
    background: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.logo {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-size: 15px;
    padding: 8px 0;
    position: relative;
    transition: color 0.3s;
}

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

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

/* ========== 主要内容区 ========== */
.main-content {
    min-height: calc(100vh - 120px);
    padding: 40px 0;
}

.page-title {
    font-size: 28px;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 40px;
}

.section-title {
    font-size: 22px;
    color: var(--text-dark);
    margin-bottom: 24px;
    padding-left: 12px;
    border-left: 4px solid var(--primary-color);
}

/* ========== 首页-联盟介绍 ========== */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 60px 0;
    margin-bottom: 40px;
}

.alliance-intro {
    max-width: 900px;
    margin: 0 auto;
    font-size: 20px;
    line-height: 1.8;
    color: #fff;
    text-align: center;
    font-weight: 500;
}

/* 专家卡片 */
.experts-section {
    margin-bottom: 60px;
}

.experts-scroll {
    display: flex;
    gap: 24px;
    overflow-x: auto;
    padding: 10px 0;
    scrollbar-width: thin;
}

.expert-card {
    min-width: 320px;
    background: #fff;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.expert-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 16px;
    display: block;
    background: var(--bg-light);
}

.expert-name {
    font-size: 20px;
    text-align: center;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.expert-title,
.expert-hospital,
.expert-specialty {
    text-align: center;
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 6px;
}

.expert-stats {
    display: flex;
    justify-content: space-around;
    margin: 20px 0;
    padding: 16px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 12px;
    color: var(--text-light);
}

.expert-achievements {
    background: var(--bg-light);
    border-radius: 8px;
    padding: 16px;
    max-height: 200px;
    overflow-y: auto;
}

.expert-achievements h4 {
    font-size: 14px;
    color: var(--text-dark);
    margin-bottom: 10px;
}

.expert-achievements ul {
    list-style: none;
    font-size: 13px;
    color: var(--text-light);
}

.expert-achievements li {
    padding: 6px 0;
    padding-left: 16px;
    position: relative;
}

.expert-achievements li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

/* 医院LOGO墙 */
.hospitals-section {
    margin-bottom: 40px;
}

.hospitals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
}

.hospital-logo {
    background: #fff;
    border-radius: 8px;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.hospital-logo img {
    max-width: 150px;
    height: 80px;
    object-fit: contain;
}

/* ========== 教学课程 ========== */
.course-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 40px;
}

.course-card {
    background: #fff;
    border-radius: 12px;
    padding: 40px 24px;
    text-align: center;
    text-decoration: none;
    color: var(--text-dark);
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
}

.card-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.course-card h3 {
    font-size: 20px;
    margin-bottom: 8px;
}

.card-count {
    font-size: 14px;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 8px;
}

.card-desc {
    font-size: 14px;
    color: var(--text-light);
}

/* 筛选栏 */
.filter-bar,
.activity-filters,
.activity-status {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.filter-btn,
.status-btn {
    padding: 8px 20px;
    border: 1px solid var(--border-color);
    background: #fff;
    border-radius: 20px;
    font-size: 14px;
    color: var(--text-dark);
    cursor: pointer;
    transition: all 0.3s;
}

.filter-btn:hover,
.status-btn:hover,
.filter-btn.active,
.status-btn.active {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

/* 课程列表 */
.detail-section {
    background: #fff;
    border-radius: 12px;
    padding: 32px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.course-list,
.case-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.course-item,
.case-item {
    display: flex;
    gap: 20px;
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: box-shadow 0.3s;
}

.course-item:hover,
.case-item:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.course-thumb {
    font-size: 40px;
    flex-shrink: 0;
}

.course-info {
    flex: 1;
}

.course-info h4 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.course-meta {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.course-points {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.btn-play,
.btn-detail {
    padding: 8px 24px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-play:hover,
.btn-detail:hover {
    background: var(--secondary-color);
}

/* ========== 直播课程 ========== */
.live-tabs {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
    border-bottom: 2px solid var(--border-color);
}

.live-tab {
    padding: 12px 24px;
    border: none;
    background: transparent;
    font-size: 16px;
    color: var(--text-light);
    cursor: pointer;
    position: relative;
    transition: color 0.3s;
}

.live-tab.active {
    color: var(--primary-color);
    font-weight: 600;
}

.live-tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

.live-category {
    margin-bottom: 32px;
}

.category-title {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.live-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.live-card {
    display: flex;
    gap: 20px;
    background: #fff;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.06);
    position: relative;
}

.live-card.upcoming {
    border-left: 4px solid var(--success-color);
}

.live-card.ended {
    border-left: 4px solid var(--text-light);
}

.live-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 4px 12px;
    background: var(--success-color);
    color: #fff;
    font-size: 12px;
    border-radius: 4px;
}

.live-card.ended .live-badge {
    background: var(--text-light);
}

.live-thumb {
    font-size: 40px;
    flex-shrink: 0;
}

.live-info {
    flex: 1;
}

.live-info h4 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.live-meta {
    display: flex;
    gap: 16px;
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.level-tag {
    background: var(--bg-light);
    padding: 2px 8px;
    border-radius: 4px;
}

.live-preview,
.live-expiry {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.live-actions {
    display: flex;
    gap: 12px;
}

.btn-reserve,
.btn-remind,
.btn-playback,
.btn-download {
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-reserve {
    background: var(--primary-color);
    color: #fff;
    border: none;
}

.btn-remind {
    background: #fff;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

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

.btn-remind:hover {
    background: var(--primary-color);
    color: #fff;
}

.btn-playback {
    background: var(--primary-color);
    color: #fff;
    border: none;
}

.btn-download {
    background: #fff;
    color: var(--text-dark);
    border: 1px solid var(--border-color);
}

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

/* ========== 学术研究 ========== */
.research-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 32px;
    background: #fff;
    padding: 8px;
    border-radius: 8px;
}

.research-tab {
    flex: 1;
    padding: 12px 24px;
    border: none;
    background: transparent;
    font-size: 15px;
    color: var(--text-light);
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.3s;
}

.research-tab.active {
    background: var(--primary-color);
    color: #fff;
}

.research-panel {
    display: none;
    background: #fff;
    border-radius: 12px;
    padding: 32px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.research-panel.active {
    display: block;
}

.panel-title {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 24px;
}

.research-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.research-item {
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.research-item h4 {
    font-size: 16px;
    color: var(--text-dark);
}

.research-meta {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.research-desc {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.research-update {
    font-size: 14px;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.research-tag,
.progress-tag {
    display: inline-block;
    padding: 4px 12px;
    font-size: 12px;
    border-radius: 4px;
    margin-top: 8px;
}

.research-tag {
    background: #e8f4f8;
    color: var(--primary-color);
}

.progress-tag {
    background: #fff3e0;
    color: var(--warning-color);
}

.result-item {
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.result-item h4 {
    font-size: 16px;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.result-meta {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.result-value {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 12px;
}

/* ========== 线下活动 ========== */
.activity-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.activity-card {
    background: #fff;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    display: flex;
    gap: 20px;
    position: relative;
}

.activity-status-tag {
    position: absolute;
    top: 24px;
    right: 24px;
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
}

.activity-status-tag.registering {
    background: var(--success-color);
    color: #fff;
}

.activity-status-tag.upcoming {
    background: var(--warning-color);
    color: #fff;
}

.activity-status-tag.ended {
    background: var(--text-light);
    color: #fff;
}

.activity-info {
    flex: 1;
}

.activity-info h4 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.activity-meta {
    display: flex;
    gap: 20px;
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.activity-desc {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 12px;
}

.activity-agenda {
    background: var(--bg-light);
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 12px;
}

.activity-agenda p {
    font-size: 14px;
    color: var(--text-dark);
    margin-bottom: 4px;
}

.activity-target {
    font-size: 14px;
    color: var(--primary-color);
}

.btn-register {
    padding: 12px 32px;
    background: var(--success-color);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    align-self: center;
    transition: background 0.3s;
}

.btn-register:hover {
    background: #219a52;
}

.btn-disabled {
    padding: 12px 32px;
    background: var(--border-color);
    color: var(--text-light);
    border: none;
    border-radius: 6px;
    font-size: 16px;
    align-self: center;
    cursor: not-allowed;
}

.ended-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-self: center;
}

.ended-actions button {
    padding: 10px 20px;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
}

.btn-summary {
    background: var(--primary-color);
    color: #fff;
    border: none;
}

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

.ended-actions .btn-download {
    background: #fff;
    color: var(--text-dark);
    border: 1px solid var(--border-color);
}

/* ========== 加入联盟 ========== */
.join-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.join-card {
    background: #fff;
    border-radius: 12px;
    padding: 32px;
    text-align: center;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.join-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.join-card h3 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.join-card p {
    font-size: 14px;
    color: var(--text-light);
}

.join-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.join-tab {
    flex: 1;
    padding: 14px 24px;
    border: 2px solid var(--border-color);
    background: #fff;
    font-size: 16px;
    color: var(--text-dark);
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s;
}

.join-tab.active {
    border-color: var(--primary-color);
    background: var(--primary-color);
    color: #fff;
}

.join-forms {
    background: #fff;
    border-radius: 12px;
    padding: 32px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.join-form {
    display: none;
}

.join-form.active {
    display: block;
}

.join-form h3 {
    font-size: 18px;
    color: var(--text-dark);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.requirement-box,
.benefit-box {
    background: var(--bg-light);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 24px;
}

.requirement-box h4,
.benefit-box h4 {
    font-size: 15px;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.requirement-box ul,
.benefit-box ul {
    list-style: none;
}

.requirement-box li,
.benefit-box li {
    font-size: 14px;
    color: var(--text-light);
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.requirement-box li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
}

.benefit-box li::before {
    content: '★';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.application-form {
    max-width: 800px;
}

.form-row {
    display: flex;
    gap: 20px;
    margin-bottom: 16px;
}

.form-group {
    flex: 1;
    margin-bottom: 16px;
}

.form-group.full {
    flex: 1 0 100%;
}

.form-group label {
    display: block;
    font-size: 14px;
    color: var(--text-dark);
    margin-bottom: 6px;
}

.required {
    color: #e74c3c;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.3s;
}

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

.file-hint {
    font-size: 12px;
    color: var(--text-light);
    margin-top: 6px;
}

.btn-submit {
    padding: 14px 48px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

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

.contact-info {
    background: #fff;
    border-radius: 12px;
    padding: 24px 32px;
    margin-top: 32px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}

.contact-info h3 {
    font-size: 16px;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.contact-info p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 6px;
}

/* ========== 页脚 ========== */
.footer {
    background: var(--text-dark);
    padding: 24px 0;
    text-align: center;
}

.footer p {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .nav-menu {
        gap: 16px;
    }

    .nav-menu a {
        font-size: 13px;
    }

    .course-cards {
        grid-template-columns: 1fr;
    }

    .join-cards {
        grid-template-columns: 1fr;
    }

    .research-tabs {
        flex-direction: column;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .activity-card {
        flex-direction: column;
    }

    .btn-register,
    .btn-disabled,
    .ended-actions {
        align-self: flex-start;
        margin-top: 16px;
    }

    .live-card {
        flex-direction: column;
    }

    .course-item {
        flex-direction: column;
    }
}