/* ===========================================
   Topic Detail Page - 专题详情页面样式
   基于 speaker-detail.css 扩展，保持一致性
   =========================================== */

/* 重置和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 配色变量 */
:root {
    --primary-dark: #1a1f3a;
    --primary-blue: #2d3561;
    --gradient-start: #ff6b35;
    --gradient-end: #8b5cf6;
    --accent-orange: #ff6b35;
    --accent-purple: #8b5cf6;
    --text-white: #ffffff;
    --text-light: #f8fafc;
    --text-gray: #64748b;
    --text-dark: #1e293b;
    --background-light: #f8fafc;
    --card-background: #ffffff;
    --border-color: #e2e8f0;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-large: 0 10px 25px rgba(0, 0, 0, 0.15);
    --transition-speed: 0.3s;
}

/* 跳过链接 */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-dark);
    color: var(--text-white);
    padding: 8px;
    text-decoration: none;
    z-index: 100;
    border-radius: 4px;
}

.skip-link:focus {
    top: 6px;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    transition: all var(--transition-speed) ease;
    border: none;
    cursor: pointer;
    font-size: 16px;
    line-height: 1;
}

.btn-primary {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: var(--text-white);
    box-shadow: var(--shadow-medium);
}

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

.btn-secondary {
    background: var(--card-background);
    color: var(--text-dark);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--background-light);
    border-color: var(--accent-orange);
    color: var(--accent-orange);
}

/* 页面沿用全局导航样式（styles.css），移除专题页的本地覆盖以保持一致性 */

/* 专题详情页基础样式 */
.topic-detail-body {
    background: var(--background-light);
    min-height: 100vh;
    padding-top: 0;
}

/* 专题标题区域 */
.topic-hero-section {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-blue) 100%);
    color: var(--text-white);
    padding: 100px 0 80px;
    position: relative;
    overflow: hidden;
}

.topic-hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 100" fill="rgba(255,255,255,0.05)"><polygon points="0,0 1000,100 1000,0"/></svg>') no-repeat bottom;
    background-size: cover;
}

.topic-hero-content {
    position: relative;
    z-index: 2;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 400px;
    gap: 60px;
    align-items: center;
}

/* 面包屑导航 */
.topic-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
    font-size: 0.9rem;
    opacity: 0.9;
}

.breadcrumb-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color var(--transition-speed) ease;
}

.breadcrumb-link:hover {
    color: var(--text-white);
}

.breadcrumb-separator {
    color: rgba(255, 255, 255, 0.6);
}

.breadcrumb-current {
    color: var(--text-white);
    font-weight: 500;
}

/* 专题标题 */
.topic-main-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin: 0 0 20px 0;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--text-white) 0%, var(--text-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.topic-subtitle {
    font-size: 1.25rem;
    line-height: 1.6;
    margin: 0 0 32px 0;
    opacity: 0.9;
    max-width: 600px;
}

/* 专题元信息 */
.topic-meta-info {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.meta-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
}

.meta-label {
    font-size: 0.8rem;
    opacity: 0.7;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.meta-value {
    font-size: 1rem;
    font-weight: 500;
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 12px;
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

/* 操作按钮 */
.topic-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.topic-hero-image {
    position: relative;
    z-index: 2;
}

.hero-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 16px;
    box-shadow: var(--shadow-large);
}

/* 通用区域样式 */
.topic-section {
    padding: 40px 0;
}

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

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 40px;
    color: var(--primary-dark);
    position: relative;
}


.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 2px;
}

/* 专题介绍区域 */
.topic-intro-section {
    background: #f8fafc;
}

.topic-intro-content {
    max-width: 800px;
    margin: 0 auto;
}

.topic-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #4a5568;
    margin-bottom: 20px;
}

.topic-description p {
    margin-bottom: 24px;
}

.topic-description p:last-child {
    margin-bottom: 0;
}

.topic-highlights {
    background: transparent;
    padding: 30px;
    border-radius: 16px;
    border-left: none;
}

.highlights-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-dark);
    margin: 0 0 20px 0;
    padding-bottom: 10px;
}

.highlights-list {
    list-style: none;
    padding: 0;
}

.highlights-list li {
    position: relative;
    padding-left: 0;
    margin-bottom: 12px;
    font-size: 1rem;
    line-height: 1.6;
    color: #4a5568;
    list-style: none;
}

.highlights-list li::before {
    content: none;
    display: none;
}

/* 内容规划区域 */
.topic-content-section {
    background: #f8fafc;
}

.content-schedule {
    max-width: 1000px;
    margin: 0 auto;
}

/* 时间线样式（仅用于专题日程） */
.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding-left: 32px;
}
.timeline::before {
    content: "";
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}
.timeline-item {
    position: relative;
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 20px;
    padding: 20px 0;
}
.timeline-dot {
    position: absolute;
    left: 16px;
    top: 32px;
    width: 16px;
    height: 16px;
    background: var(--accent-orange);
    border-radius: 50%;
    border: 2px solid #fff;
    box-shadow: var(--shadow-light);
}
.timeline-time {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-dark);
    text-align: center;
    background: var(--background-light);
    padding: 12px 16px;
    border-radius: 12px;
    align-self: flex-start;
}
.timeline-content {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 16px;
}
.timeline-content .speaker-avatar-small {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent-orange);
}
.timeline-content .speaker-details {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.timeline-content .speaker-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
}
.timeline-content .speaker-title {
    font-size: 0.95rem;
    color: var(--text-gray);
    margin: 0;
}
.timeline-content .speaker-topic {
    font-size: 1rem;
    color: var(--text-dark);
    font-weight: 500;
    margin: 0;
}

@media (max-width: 768px) {
  .timeline {
    padding-left: 0;
  }
  .timeline::before {
    left: 0;
  }
  .timeline-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .timeline-time {
    width: fit-content;
    margin-left: 24px;
  }
  .timeline-dot {
    left: -8px;
    top: 28px;
  }
}

.schedule-item {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: var(--card-background);
    border-radius: 16px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-light);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
    border-left: none;
    border: 1px solid #e2e8f0;
}

.schedule-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-large);
}

.schedule-item:last-child {
    margin-bottom: 0;
}

.schedule-time {
    flex-shrink: 0;
    width: 120px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-dark);
    text-align: center;
    background: var(--background-light);
    padding: 16px;
    border-radius: 12px;
    align-self: flex-start;
}

.schedule-content {
    flex: 1;
}

.schedule-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0 0 16px 0;
    line-height: 1.4;
}

.speaker-info {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
    padding: 16px;
    background: var(--background-light);
    border-radius: 12px;
}

.speaker-avatar-small {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent-orange);
}

.speaker-details {
    flex: 1;
}

.speaker-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0 0 4px 0;
}

.speaker-title {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin: 0;
}

/* 统一到上方的 .topic-description 定义，移除重复规则 */

/* 相关演讲者区域 */
.topic-speakers-section {
    background: white;
}

.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    max-width: 1200px;
    margin: 0 auto;
}

.speaker-card {
    background: var(--card-background);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: all var(--transition-speed) ease;
    border: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.speaker-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-large);
}

.speaker-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin-bottom: 20px;
    object-fit: cover;
    border: 3px solid var(--accent-orange);
}

.speaker-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0 0 8px 0;
}

.speaker-title {
    font-size: 0.9rem;
    color: var(--text-gray);
    margin: 0 0 16px 0;
}

.speaker-topic {
    font-size: 1rem;
    color: var(--text-dark);
    font-weight: 500;
    margin: 0 0 20px 0;
}

.speaker-link {
    color: var(--accent-orange);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-speed) ease;
}

.speaker-link:hover {
    color: var(--primary-dark);
}

.topic-speakers-section .speaker-card-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1a1f3a;
    margin: 0 0 8px 0;
}

.topic-speakers-section .speaker-card-title {
    color: #ff6b35;
    font-weight: 500;
    margin: 0 0 4px 0;
}

.topic-speakers-section .speaker-card-company {
    color: #64748b;
    font-size: 0.9rem;
    margin: 0 0 12px 0;
}

.topic-speakers-section .speaker-card-topic {
    color: #4a5568;
    font-size: 0.95rem;
    line-height: 1.4;
    margin: 0 0 20px 0;
    font-weight: 500;
}

.topic-speakers-section .speaker-card-link {
    display: inline-block;
    color: #ff6b35;
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border: 2px solid #ff6b35;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.topic-speakers-section .speaker-card-link:hover {
    background: #ff6b35;
    color: white;
}

/* 行动区域 */
.topic-action-section {
    background: linear-gradient(135deg, var(--accent-orange) 0%, var(--accent-purple) 100%);
    color: white;
    text-align: center;
}

.action-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0 0 16px 0;
}

.action-content p {
    font-size: 1.1rem;
    opacity: 0.9;
    margin: 0 0 32px 0;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.action-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* 相关专题推荐 */
.related-topics-section {
    background: var(--background-light);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
    max-width: 1200px;
    margin: 0 auto;
}

.topic-card {
    background: var(--card-background);
    border-radius: 16px;
    padding: 40px 32px;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: all var(--transition-speed) ease;
    border: 1px solid var(--border-light);
}

.topic-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-large);
}

.topic-card-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0 0 16px 0;
}

.topic-card-description {
    color: var(--text-gray);
    line-height: 1.6;
    margin: 0 0 24px 0;
    font-size: 1rem;
}

.topic-card-link {
    display: inline-block;
    background: linear-gradient(135deg, var(--accent-orange), var(--accent-purple));
    color: white;
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
}

.topic-card-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 53, 0.3);
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease-out;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .topic-hero-section {
        padding: 60px 0 40px;
    }
    
    .topic-main-title {
        font-size: 2rem;
    }
    
    .topic-subtitle {
        font-size: 1.1rem;
    }
    
    .topic-meta {
        gap: 12px;
    }
    
    .topic-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .topic-intro-section,
    .topic-content-section,
    .topic-speakers-section,
    .topic-action-section,
    .related-topics-section {
        padding: 40px 0;
    }
    
    .schedule-item {
        flex-direction: column;
        gap: 20px;
        padding: 24px;
    }
    
    .schedule-time {
        width: auto;
        text-align: left;
        display: flex;
        align-items: center;
        gap: 12px;
    }
    
    .topics-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .topic-card {
        padding: 32px 24px;
    }
    
    .action-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .action-content h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .topic-main-title {
        font-size: 1.75rem;
    }
    
    .topic-breadcrumb {
        font-size: 0.8rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .topic-meta {
        flex-direction: column;
        gap: 8px;
    }
    
    .schedule-item {
        padding: 20px;
    }
    
    .schedule-content h3 {
        font-size: 1.1rem;
    }
    
    .speaker-avatar-small {
        width: 36px;
        height: 36px;
    }
    
    .speakers-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .speaker-card {
        padding: 24px;
    }
    
    .topic-card {
        padding: 24px 20px;
    }
    
    .action-content h2 {
        font-size: 1.75rem;
    }
    
    .action-content p {
        font-size: 1rem;
    }
}

/* 打印样式 */
@media print {
   /*  .navbar, */
    .back-to-top,
    .topic-actions,
    .action-buttons,
    .topic-card-link {
        display: none;
    }
    
    .topic-hero-section {
        background: #1a1f3a;
        color: black;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
    
    .topic-main-title {
        -webkit-text-fill-color: initial;
        color: black;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    .topic-hero-section {
        background: #000;
        color: #fff;
    }
    
    .btn-secondary,
    .btn-outline {
        border-width: 3px;
    }
    
    .highlight-item {
        border: 2px solid #000;
    }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 延迟加载图片样式 */
img.lazy {
    opacity: 0;
    transition: opacity 0.3s ease;
}

img.lazy.loaded {
    opacity: 1;
}

/* 返回顶部按钮样式 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--accent-orange);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    box-shadow: var(--shadow-large);
    transition: all var(--transition-speed) ease;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* ====== 移动端时间被遮挡修复（确保小黄点与时间精确对齐且不重叠） ====== */
.timeline { overflow: visible; }
.timeline::before { z-index: 0; }

/* 统一层级：小黄点与时间线在下，时间文本在上 */
.timeline-item .timeline-dot { z-index: 0; }
.timeline-item .timeline-time {
  position: relative;
  z-index: 1;
  /* 确保可读的背景与圆角（保持与原设计一致） */
  background: var(--background-light);
  border-radius: 12px;
}

/* 取消旧移动端规则的横向偏移干扰，改用网格列对齐 */
@media (max-width: 768px) {
  .timeline-item {
    grid-template-columns: 18px 64px 1fr !important; /* 加宽时间列，避免与黄点重叠 */
    column-gap: 10px;
  }
  .timeline-item .timeline-time {
    margin-left: 0 !important;
    width: auto !important;
    text-align: left !important;
    display: flex;
    align-items: center;
  }
  .timeline::before { left: 9px !important; }
}

/* 桌面端也锁定层级，避免偶发重叠 */
@media (min-width: 769px) {
  .timeline-item {
    grid-template-columns: 20px minmax(56px, 80px) 1fr !important;
    column-gap: 12px;
  }
  .timeline::before { left: 10px !important; }
}

/* ===== 时间轴小黄点与时间文本精确对齐（覆盖修复） ===== */
.timeline {
  padding-left: 0 !important; /* 交给网格列控制横向布局 */
  position: relative;
}
.timeline::before {
  left: 10px !important;      /* 与第一列中线对齐：20px 列宽的一半 */
}

.timeline-item {
  display: grid !important;
  grid-template-columns: 20px minmax(56px, 80px) 1fr; /* 黄点 / 时间 / 内容 */
  align-items: center;         /* 垂直方向居中对齐 */
  column-gap: 12px;
  position: relative;
  min-height: 32px;
}

.timeline-item .timeline-dot {
  position: static !important; /* 清理旧的绝对定位 */
  left: auto !important;
  top: auto !important;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-orange);
  border: 2px solid #fff;
  box-shadow: var(--shadow-light);
  grid-column: 1;
  justify-self: center;        /* 水平居中到第一列中线 */
  align-self: center;          /* 垂直居中 */
}

.timeline-item .timeline-time {
  position: static !important; /* 确保不受旧定位干扰 */
  grid-column: 2;
  justify-self: start;         /* 时间文本靠左 */
  align-self: center;
  display: flex;
  align-items: center;         /* 文本在容器中垂直居中 */
  line-height: 1.2;
  height: 1.2em;               /* 基线稳定 */
  font-variant-numeric: tabular-nums; /* 数字等宽便于视觉对齐 */
  text-align: left !important; /* 与时间列保持一致 */
}

.timeline-item .timeline-content {
  grid-column: 3;
}

/* 若更偏好基线对齐，可启用以下基线策略（保留中心对齐为主） */
/*
@supports (align-items: baseline) {
  .timeline-item { align-items: baseline; }
  .timeline-item .timeline-dot { align-self: center; }
  .timeline-item .timeline-time { align-self: baseline; }
}
*/

/* 移动端：缩窄列宽并保持对齐 */
@media (max-width: 768px) {
  .timeline::before { left: 9px !important; }
  .timeline-item {
    grid-template-columns: 18px 56px 1fr;
    column-gap: 10px;
  }
  .timeline-item .timeline-time {
    font-size: 0.95rem;
  }
}