/* ==========================================
           达特茅斯会议详情页 — 专有样式
           延续 part3 的温暖杂志风
           ========================================== */

        .main-content {
            width: 90%;
            margin: 0 auto;
        }

        /* ---- 返回按钮 ---- */
        .back-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 16px;
            color: var(--primary);
            text-decoration: none;
            font-size: 0.9rem;
            font-weight: 500;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-subtle);
            background: var(--bg-card);
            margin-bottom: var(--space-lg);
            transition: all var(--transition-base);
        }

        .back-link:hover {
            color: var(--primary-dark);
            background: hsl(var(--primary-hue) 60% 95%);
            transform: translateX(-2px);
        }

        .back-link svg {
            flex-shrink: 0;
        }

        /* ---- Hero ---- */
        .detail-hero {
            text-align: center;
            padding: var(--space-2xl) 0;
            margin-bottom: var(--space-2xl);
            position: relative;
        }

        .detail-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 120px;
            height: 3px;
            background: linear-gradient(90deg, transparent, var(--accent), var(--primary), transparent);
            border-radius: 2px;
        }

        .detail-hero-badge {
            display: inline-block;
            font-family: 'Noto Serif SC', serif;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--accent);
            background: hsl(var(--accent-hue) 80% 95%);
            border: 1px solid hsl(var(--accent-hue) 60% 85%);
            padding: 6px 20px;
            border-radius: var(--radius-xl);
            margin-bottom: var(--space-md);
            letter-spacing: 0.1em;
        }

        .detail-hero-year {
            font-family: 'JetBrains Mono', monospace;
            font-size: clamp(3rem, 8vw, 5rem);
            font-weight: 900;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.1;
            margin-bottom: var(--space-sm);
        }

        .detail-hero-title {
            font-family: 'Noto Serif SC', serif;
            font-size: clamp(1.8rem, 5vw, 2.8rem);
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--space-xs);
        }

        .detail-hero-subtitle {
            font-family: 'Noto Sans SC', sans-serif;
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: var(--space-lg);
        }

        .detail-hero-meta {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: var(--space-lg);
            margin-top: var(--space-xl);
        }

        /* ---- Hero 元信息行（非卡片） ---- */
        .hero-meta-row {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: var(--space-2xl);
            margin-top: var(--space-lg);
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        .hero-meta-row .meta-pair {
            display: flex;
            gap: var(--space-sm);
        }

        .hero-meta-row .meta-key {
            color: var(--text-muted);
            font-size: 0.8rem;
            white-space: nowrap;
        }

        .hero-meta-row .meta-val {
            color: var(--text-primary);
            font-weight: 500;
        }

        /* ---- 通用详情区块 ---- */
        .detail-section {
            margin-bottom: var(--space-2xl);
            text-align: center;
        }

        .detail-inner {
            max-width: 1000px;
            margin: 0 auto;
        }

        .detail-section-title {
            font-family: 'Noto Serif SC', serif;
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: var(--space-md);
        }

        .detail-section-subtitle {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.8;
        }

        /* ---- 引语 ---- */
        .detail-quote {
            background: linear-gradient(145deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
            border: 1px solid var(--border-medium);
            border-left: 4px solid var(--accent);
            border-radius: var(--radius-md);
            padding: var(--space-lg) var(--space-xl);
            margin: var(--space-lg) 0;
            position: relative;
            box-shadow: var(--shadow-sm);
        }

        .detail-quote::before {
            content: '"';
            position: absolute;
            top: 10px;
            left: 12px;
            font-family: 'Georgia', serif;
            font-size: 3.5rem;
            color: var(--accent);
            opacity: 0.12;
            line-height: 1;
        }

        .detail-quote p,
        .detail-quote div:not(:last-child) {
            font-size: 0.95rem;
            line-height: 1.8;
            color: var(--text-primary);
        }

        .detail-quote cite {
            display: block;
            font-size: 0.8rem;
            color: var(--text-muted);
            font-style: normal;
            margin-top: var(--space-sm);
        }

        /* ---- 故事时间线 ---- */
        .story-timeline {
            position: relative;
            padding-left: var(--space-xl);
            margin: var(--space-xl) 0;
        }

        .story-timeline::before {
            content: '';
            position: absolute;
            top: 0;
            bottom: 0;
            left: 6px;
            width: 2px;
            background: linear-gradient(180deg, var(--primary), var(--accent));
            border-radius: 1px;
        }

        .story-item {
            position: relative;
            margin-bottom: var(--space-xl);
            padding: var(--space-lg) var(--space-xl);
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-slow);
        }

        .story-item:hover {
            transform: translateX(4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--border-accent);
        }

        .story-item::before {
            content: '';
            position: absolute;
            top: 24px;
            left: -25px;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--primary);
            border: 3px solid var(--bg-base);
            box-shadow: 0 0 0 2px var(--primary);
        }

        .story-date {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.75rem;
            color: var(--primary);
            margin-bottom: var(--space-xs);
        }

        .story-title {
            font-family: 'Noto Serif SC', serif;
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: var(--space-sm);
        }

        .story-text {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.8;
        }

        /* ---- 经典照片 ---- */
        .photo-section {
            margin: var(--space-xl) 0;
            text-align: center;
        }

        .photo-frame {
            position: relative;
            display: inline-block;
            max-width: 900px;
            width: 100%;
            background: var(--bg-card);
            border: 2px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }

        .photo-image {
            width: 100%;
            height: auto;
            display: block;
        }

        /* 照片悬浮热点 */
        .photo-hotspots {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }

        .photo-hotspot {
            cursor: pointer;
            transition: background var(--transition-base);
            border-radius: var(--radius-sm);
        }

        .photo-hotspot:hover {
            background: rgba(192, 132, 252, 0.12);
        }

        .photo-tooltip {
            opacity: 0;
            transition: opacity var(--transition-base);
            background: var(--bg-card);
            border: 1px solid var(--border-accent);
            border-radius: var(--radius-md);
            padding: var(--space-sm) var(--space-md);
            text-align: center;
            box-shadow: var(--shadow-md);
            font-size: 0.8rem;
            pointer-events: none;
            width: 160px;
            margin: -180px 0 0 80px;
            position: relative;
            top: -40px;
        }

        .photo-hotspot:hover .photo-tooltip {
            opacity: 1;
        }

        .tooltip-name {
            font-weight: 600;
            color: var(--text-primary);
            font-size: 0.85rem;
        }

        .tooltip-name-en {
            font-size: 0.7rem;
            color: var(--text-muted);
            font-style: italic;
            margin-bottom: 4px;
        }

        .tooltip-badge {
            display: inline-block;
            font-size: 0.6rem;
            padding: 2px 8px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            margin-bottom: 4px;
        }

        .tooltip-desc {
            font-size: 0.75rem;
            color: var(--text-secondary);
            line-height: 1.4;
        }

        .photo-caption {
            padding: var(--space-md);
            font-size: 0.82rem;
            color: var(--text-secondary);
            line-height: 1.6;
            background: var(--bg-elevated);
            border-top: 1px solid var(--border-subtle);
        }

        /* ---- 图例 ---- */
        .attendee-legend {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: var(--space-lg);
            margin: var(--space-lg) 0;
        }

        .legend-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-secondary);
        }

        .legend-line {
            width: 24px;
            height: 3px;
            border-radius: 2px;
            flex-shrink: 0;
        }

        /* ---- 与会者卡片网格 ---- */
        .attendees-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: var(--space-md);
        }

        .attendee-card {
            display: flex;
            align-items: center;
            gap: var(--space-md);
            padding: var(--space-md) var(--space-lg);
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            transition: all var(--transition-slow);
            box-shadow: var(--shadow-sm);
        }

        .attendee-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
            border-color: var(--border-accent);
        }

        .attendee-avatar {
            flex-shrink: 0;
            width: 52px;
            height: 52px;
            border-radius: 50%;
            overflow: hidden;
        }

        .attendee-avatar img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .attendee-avatar-placeholder {
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.7rem;
            font-weight: 600;
            color: #fff;
            border-radius: 50%;
        }

        .attendee-info {
            flex: 1;
        }

        .attendee-name {
            font-family: 'Noto Serif SC', serif;
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-primary);
        }

        .attendee-affiliation {
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-bottom: 4px;
        }

        .attendee-badge {
            font-size: 0.6rem;
            padding: 2px 8px;
            border-radius: var(--radius-sm);
            font-weight: 500;
        }

        .badge-founder {
            background: hsl(var(--accent-hue) 80% 95%);
            color: hsl(var(--accent-hue) 80% 40%);
            border: 1px solid hsl(var(--accent-hue) 60% 85%);
        }

        .badge-participant {
            background: #EEF2FF;
            color: #4338CA;
            border: 1px solid #C7D2FE;
        }

        .badge-guest {
            background: #FFFBEB;
            color: #92400E;
            border: 1px solid #FDE68A;
        }

        /* ---- 议题大树 (CSS Tree Cards) ---- */
        .topics-tree {
            max-width: 1100px;
            margin: 0 auto;
            padding: var(--space-xl) 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0;
        }

        /* 根节点 */
        .tree-root {
            background: linear-gradient(135deg, #44403c 0%, #57534e 100%);
            color: #fff;
            padding: var(--space-lg) var(--space-2xl);
            border-radius: var(--radius-xl);
            text-align: center;
            box-shadow: var(--shadow-lg);
            position: relative;
            z-index: 2;
            border: 2px solid #78716c;
        }

        .tree-root::before {
            content: '';
            position: absolute;
            inset: -3px;
            border-radius: var(--radius-xl);
            background: linear-gradient(135deg, var(--accent), var(--primary), var(--accent));
            z-index: -1;
            opacity: 0.5;
        }

        .root-year {
            font-family: 'JetBrains Mono', monospace;
            font-size: 2.5rem;
            font-weight: 900;
            background: linear-gradient(135deg, #fde047, #fbbf24);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
            margin-bottom: 4px;
        }

        .root-title {
            font-family: 'Noto Serif SC', serif;
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 2px;
        }

        .root-subtitle {
            font-size: 0.7rem;
            color: #a8a29e;
            font-family: 'JetBrains Mono', monospace;
            letter-spacing: 0.05em;
        }

        /* 连接线行 */
        .connector-row {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 40px;
            width: 100%;
            position: relative;
        }

        .connector-row-2 {
            height: 30px;
        }

        .branch-line {
            width: 2px;
            height: 100%;
            background: linear-gradient(180deg, var(--primary), var(--accent));
            border-radius: 1px;
            position: relative;
        }

        /* 横向分支线 */
        .tree-row {
            display: flex;
            justify-content: center;
            align-items: flex-start;
            gap: var(--space-md);
            width: 100%;
            position: relative;
            flex-wrap: wrap;
        }

        .tree-row::before {
            content: '';
            position: absolute;
            top: -20px;
            left: 50%;
            transform: translateX(-50%);
            width: 2px;
            height: 20px;
            background: linear-gradient(180deg, var(--primary), var(--accent));
        }

        .row-1::before {
            width: 80%;
            height: 2px;
            top: -20px;
            left: 10%;
            transform: none;
            background: linear-gradient(90deg, transparent, var(--primary), var(--accent), var(--primary), transparent);
        }

        .row-2::before {
            width: 40%;
            height: 2px;
            top: -15px;
            left: 30%;
            transform: none;
            background: linear-gradient(90deg, transparent, var(--primary), var(--accent), transparent);
        }

        /* 垂直连接线到卡片 */
        .tree-row .topic-card::before {
            content: '';
            position: absolute;
            top: -20px;
            left: 50%;
            transform: translateX(-50%);
            width: 2px;
            height: 20px;
            background: linear-gradient(180deg, var(--accent), var(--primary));
            border-radius: 1px;
        }

        .row-2 .topic-card::before {
            height: 15px;
            top: -15px;
        }

        /* 话题卡片 */
        .topic-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            width: 180px;
            min-height: 180px;
            position: relative;
            transition: all var(--transition-slow);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            overflow: hidden;
        }

        .topic-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            opacity: 0;
            transition: opacity var(--transition-base);
        }

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

        .topic-card:hover::after {
            opacity: 1;
        }

        .topic-card.featured {
            border-color: var(--border-accent);
            box-shadow: var(--shadow-md);
        }

        .topic-card.featured::after {
            opacity: 1;
            background: linear-gradient(90deg, var(--primary), var(--accent), var(--primary));
        }

        /* 卡片编号 */
        .card-number {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.7rem;
            font-weight: 600;
            color: #fff;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: var(--space-sm);
            box-shadow: 0 2px 8px rgba(220, 38, 38, 0.2);
        }

        /* 卡片标题 */
        .card-title {
            font-family: 'Noto Serif SC', serif;
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 2px;
        }

        .card-en {
            font-size: 0.65rem;
            color: var(--text-muted);
            font-style: italic;
            margin-bottom: var(--space-sm);
            letter-spacing: 0.02em;
        }

        /* 卡片问题 */
        .card-question {
            font-size: 0.8rem;
            color: var(--text-secondary);
            line-height: 1.5;
            margin-bottom: auto;
            padding: var(--space-sm) 0;
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
            width: 100%;
        }

        /* 演进标签 */
        .card-evolve {
            display: flex;
            flex-direction: column;
            gap: 4px;
            width: 100%;
            margin-top: var(--space-sm);
        }

        .evolve-label {
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--primary);
        }

        .evolve-tag {
            font-size: 0.65rem;
            padding: 2px 8px;
            background: var(--bg-elevated);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            align-self: flex-start;
        }

        /* 底部说明 */
        .tree-footer {
            margin-top: var(--space-xl);
            text-align: center;
        }

        .tree-note {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            font-style: italic;
            padding: var(--space-sm) var(--space-lg);
            background: var(--bg-elevated);
            border-radius: var(--radius-xl);
            border: 1px solid var(--border-subtle);
        }

        .note-dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: inline-block;
            animation: pulse 2s ease-in-out infinite;
        }

        @keyframes pulse {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.5; transform: scale(1.3); }
        }

        /* 入场动画 */
        .topics-tree .topic-card {
            opacity: 0;
            transform: translateY(20px);
            animation: cardIn 0.5s ease forwards;
        }

        .topics-tree .topic-card:nth-child(1) { animation-delay: 0.1s; }
        .topics-tree .topic-card:nth-child(2) { animation-delay: 0.15s; }
        .topics-tree .topic-card:nth-child(3) { animation-delay: 0.2s; }
        .topics-tree .topic-card:nth-child(4) { animation-delay: 0.25s; }
        .topics-tree .topic-card:nth-child(5) { animation-delay: 0.3s; }
        .topics-tree .topic-card:nth-child(6) { animation-delay: 0.35s; }
        .topics-tree .topic-card:nth-child(7) { animation-delay: 0.4s; }

        @keyframes cardIn {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ---- 响应式 ---- */
        @media (max-width: 1024px) {
            .tree-row.row-1 {
                gap: var(--space-sm);
            }
            .topic-card {
                width: 160px;
                min-height: 160px;
                padding: var(--space-md);
            }
        }

        @media (max-width: 768px) {
            .tree-row {
                flex-direction: column;
                align-items: center;
            }

            .tree-row::before {
                display: none;
            }

            .topic-card {
                width: 90%;
                max-width: 300px;
                min-height: auto;
            }

            .topic-card::before {
                display: none;
            }

            .row-2 .topic-card::before {
                display: none;
            }

            .root-year {
                font-size: 2rem;
            }

            .tree-branch.connector-row {
                height: 20px;
            }

            .topics-tree {
                gap: 0;
            }
        }

        /* ---- 页脚返回 ---- */
        .detail-footer {
            text-align: center;
            padding: var(--space-2xl) 0;
            border-top: 1px solid var(--border-subtle);
            margin-top: var(--space-2xl);
        }

        .back-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 24px;
            color: var(--primary);
            text-decoration: none;
            font-size: 0.9rem;
            font-weight: 500;
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            background: var(--bg-card);
            transition: all var(--transition-base);
        }

        .back-btn:hover {
            color: var(--primary-dark);
            background: hsl(var(--primary-hue) 60% 95%);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        /* ---- Fade-in ---- */
        .fade-in {
            opacity: 0;
            animation: fadeInUp 0.5s ease forwards;
        }

        @keyframes fadeInUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .fade-in {
            transform: translateY(20px);
        }

        /* ---- 响应式 ---- */
        @media (max-width: 768px) {
            .tree-branches {
                grid-template-columns: repeat(2, 1fr);
            }

            .tree-branches-row2 {
                grid-template-columns: 1fr;
            }

            .detail-hero-meta {
                flex-direction: column;
                align-items: center;
            }

            .attendees-grid {
                grid-template-columns: 1fr;
            }

            .photo-tooltip {
                width: 120px;
                margin-left: 40px;
            }
        }

        /* ---- Canvas Particle Background ---- */
        #particles {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 0;
            pointer-events: none;
        }

        main {
            position: relative;
            z-index: 1;
        }