*{margin:0;padding:0;box-sizing:border-box}
    /* sidebar-bg 由 mz-header.css 统一管理 */
    body.dark{--text-primary:#f0f4fc;--text-secondary:#cbd5e6;--text-muted:#8b9abc;--sidebar-bg:#1e293b}
    body{font-family:'Inter',-apple-system,system-ui,sans-serif;background:#fff;color:var(--text-primary);height:100vh;overflow:auto!important}

    .sidebar{position:fixed;left:0;top:0;width:52px;overflow:hidden;background:var(--sidebar-bg);backdrop-filter:blur(8px);border-right:1px solid var(--glass-border);z-index:100;display:flex;flex-direction:column;height:auto;transform:none;transition:width 0.3s ease 0.13s}
    .sidebar .sidebar-inner{padding:24px 4px;align-items:center}
    .sidebar .nav-item{padding:10px 4px;min-width:0;width:100%;justify-content:center}
    .sidebar .nav-item-wrapper.has-sub > .nav-item{padding-right:4px}
    .sidebar .nav-item-wrapper.has-sub > .nav-item::after{display:none}
    .sidebar:hover .nav-item-wrapper.has-sub > .nav-item{position:relative;padding-right:20px}
    .sidebar:hover .nav-item-wrapper.has-sub > .nav-item::after{display:block}
    .submenu-panel{transition:opacity 0.12s ease-out,transform 0.12s cubic-bezier(.2,.8,.2,1),visibility 0.12s ease-out}
    .sidebar .sidebar-logo img{width:42px;height:42px;border-radius:12px;margin-bottom:0}
    @media(min-width:1001px){
      .sidebar .sidebar-logo-expanded{display:none!important}
      .sidebar .sidebar-logo-collapsed{display:block!important}
      .sidebar:hover .sidebar-logo-expanded{display:block!important}
      .sidebar:hover .sidebar-logo-collapsed{display:none!important}
    }
    .sidebar .sidebar-nav { margin-top: 80px; }
    .sidebar .sidebar-footer{padding:8px 4px;display:none}
    .sidebar .contact-row{display:none}
    .sidebar .qr-row{display:none}
    .sidebar .contact-item{padding:6px 4px;gap:0;justify-content:center}
    .sidebar .about-btn{width:100%}
    .sidebar .about-btn .nav-item{padding:10px 4px;min-width:0;width:100%;justify-content:center;gap:0;background:transparent;border:none}
    .sidebar:hover{width:260px;border-radius:0 32px 32px 0;box-shadow:var(--sidebar-shadow)}
    .sidebar:hover .sidebar-inner{padding:clamp(12px,2.5vh,24px) 12px;align-items:stretch}
    .sidebar:hover .sidebar-logo{width:auto}
    .sidebar:hover .sidebar-logo img{width:clamp(50px,10vh,90px);height:clamp(50px,10vh,90px);border-radius:20px;margin-bottom:clamp(6px,1.5vh,12px)}

    .sidebar:hover .sidebar-nav{width:100%;margin-top:0}
    .sidebar:hover .nav-item{padding:clamp(6px,1vh,10px) 20px;min-width:165px;width:auto;gap:10px;justify-content:center}
    .sidebar:hover .nav-item > span{flex:1;text-align:left;margin-left:4px}
    .nav-item span{display:none}
    .sidebar:hover .nav-item span{display:inline}

    .sidebar:hover .sub-nav{min-width:180px}
    .sidebar:hover .sidebar-footer{padding:clamp(8px,2vh,16px) 12px;display:block}
    .sidebar:hover .contact-row{display:flex}
    .sidebar:hover .qr-row{display:flex}
    .sidebar:hover .contact-item{width:30px;height:30px;gap:0}
    .sidebar:hover .about-btn{width:100%;margin-top:8px;display:flex;justify-content:center}
    .sidebar:hover .about-btn .nav-item{padding:10px 20px;justify-content:center;background:var(--accent-light);color:var(--accent);border:1px solid rgba(59,130,246,0.2);font-weight:600;font-size:0.9rem}
    .sidebar:hover .about-btn .nav-item > span{flex:1;text-align:left;margin-left:4px}
    .about-btn .nav-item span{display:none}
    .sidebar:hover .about-btn .nav-item span{display:inline}

    /* 桌面侧栏：让容器、内容区和菜单文字使用同一节奏展开，避免出现先位移后展开的跳变。 */
    @media(min-width:1001px){
      .sidebar{transition:width .34s cubic-bezier(.22,.61,.36,1);will-change:width}
      .sidebar[data-touch-dismissed="true"],
      .sidebar[data-touch-dismissed="true"]:hover{width:52px!important}
      .sidebar[data-touch-dismissed="true"],
      .sidebar[data-touch-dismissed="true"]:hover{border-radius:0 24px 24px 0;box-shadow:none}
      .main-wrapper{transition:margin-left .34s cubic-bezier(.22,.61,.36,1);will-change:margin-left}
      .sidebar[data-touch-dismissed="true"]~.main-wrapper{margin-left:52px!important}
      .sidebar .sidebar-inner{transition:padding .34s cubic-bezier(.22,.61,.36,1)}
      .sidebar .sidebar-inner,
      .sidebar:hover .sidebar-inner{padding-top:clamp(12px,2.5vh,24px)}
      .sidebar .sidebar-logo{display:flex;height:clamp(72px,12vh,102px);margin-bottom:0;overflow:hidden}
      .sidebar .sidebar-nav,
      .sidebar:hover .sidebar-nav{margin-top:12px!important;transform:none;transition:margin-top .34s cubic-bezier(.22,.61,.36,1)}
      .sidebar .sidebar-logo img{transition:width .34s cubic-bezier(.22,.61,.36,1),height .34s cubic-bezier(.22,.61,.36,1),border-radius .34s cubic-bezier(.22,.61,.36,1),margin .34s cubic-bezier(.22,.61,.36,1)}
      .sidebar .nav-item{transition:padding .34s cubic-bezier(.22,.61,.36,1),gap .34s cubic-bezier(.22,.61,.36,1),min-width .34s cubic-bezier(.22,.61,.36,1),transform .2s ease,filter .2s ease}
      .sidebar .nav-item > span,
      .sidebar .about-btn .nav-item span{display:inline!important;flex:0 0 auto;max-width:0;margin-left:0;overflow:hidden;opacity:0;transform:translateX(-6px);transition:max-width .26s cubic-bezier(.22,.61,.36,1),margin-left .26s cubic-bezier(.22,.61,.36,1),opacity .16s ease,transform .26s cubic-bezier(.22,.61,.36,1)}
      .sidebar:hover .nav-item > span,
      .sidebar:hover .about-btn .nav-item span{flex:1 1 auto;max-width:168px;margin-left:4px;opacity:1;transform:translateX(0);transition-delay:.08s}
      .sidebar[data-touch-dismissed="true"] .sidebar-inner,
      .sidebar[data-touch-dismissed="true"]:hover .sidebar-inner{padding:24px 4px;align-items:center}
      .sidebar[data-touch-dismissed="true"] .sidebar-logo,
      .sidebar[data-touch-dismissed="true"]:hover .sidebar-logo{display:flex!important;width:auto;height:clamp(72px,12vh,102px);margin-bottom:0}
      .sidebar[data-touch-dismissed="true"] .sidebar-logo-expanded,
      .sidebar[data-touch-dismissed="true"]:hover .sidebar-logo-expanded{display:none!important}
      .sidebar[data-touch-dismissed="true"] .sidebar-logo-collapsed,
      .sidebar[data-touch-dismissed="true"]:hover .sidebar-logo-collapsed{display:block!important;width:42px;height:42px;border-radius:12px;margin-bottom:0}
      .sidebar[data-touch-dismissed="true"] .nav-item,
      .sidebar[data-touch-dismissed="true"]:hover .nav-item{width:100%;min-width:0;padding:10px 4px!important;gap:0;justify-content:center}
      .sidebar[data-touch-dismissed="true"] .nav-item > span,
      .sidebar[data-touch-dismissed="true"]:hover .nav-item > span{display:none!important}
      .sidebar[data-touch-dismissed="true"] .nav-item-wrapper.has-sub > .nav-item::after,
      .sidebar[data-touch-dismissed="true"]:hover .nav-item-wrapper.has-sub > .nav-item::after{display:none!important}
      .sidebar[data-touch-dismissed="true"] .sidebar-nav,
      .sidebar[data-touch-dismissed="true"]:hover .sidebar-nav{margin-top:12px!important;transform:none!important}
      .sidebar[data-touch-dismissed="true"] .sidebar-footer,
      .sidebar[data-touch-dismissed="true"]:hover .sidebar-footer{display:none}
    }

    /* ===== 右侧主内容 ===== */
    .main-wrapper{margin-left:52px;height:100vh;overflow:hidden;position:relative}
    .sidebar:hover~.main-wrapper{margin-left:280px}
    .mindmap-iframe{position:absolute;top:0;left:0;width:100%;height:100%}
    .mindmap-iframe iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}

    /* ===== 浮动 UI ===== */
    .info-card{position:absolute;top:24px;left:24px;width:fit-content;max-width:min(360px,calc(100% - 48px));background:rgba(255,255,255,0.9);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-radius:18px;padding:12px 14px 13px;border:1px solid rgba(15,23,42,0.09);z-index:30;box-shadow:0 10px 28px rgba(15,23,42,0.10)}
    body.dark .info-card{background:rgba(30,41,59,0.85);border-color:rgba(255,255,255,0.08);box-shadow:0 8px 30px rgba(0,0,0,0.25)}
    .title-row{display:flex;align-items:center;gap:10px;min-width:0}
    .back-arrow{display:flex;align-items:center;justify-content:center;width:36px;height:36px;font-size:1.75rem;font-weight:300;color:#475569;cursor:pointer;border-radius:12px;transition:background-color 0.2s ease,color 0.2s ease,transform 0.2s ease;user-select:none;flex-shrink:0;line-height:1;background:#f1f5f9;text-decoration:none}
    .back-arrow:hover{background:#e0ecfb;color:#2563eb;transform:translateX(-2px)}
    .back-arrow:focus-visible{outline:2px solid #60a5fa;outline-offset:2px}
    .info-card h3{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:1rem;font-weight:700;color:#1e293b;line-height:1.35}
    .bottom-bar{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);display:flex;gap:12px;z-index:30;align-items:center}
    .bottom-btn{background:rgba(30,41,59,0.7);backdrop-filter:blur(16px);border:1px solid rgba(255,255,255,0.2);border-radius:60px;padding:10px 22px;color:white;cursor:pointer;transition:0.2s;font-family:inherit;font-size:0.85rem;font-weight:500;display:flex;align-items:center;gap:8px}
    body.dark .bottom-btn{background:rgba(0,0,0,0.6)}
    .bottom-btn:hover{background:var(--accent);transform:scale(0.97);border-color:var(--accent)}
      .bottom-btn .btn-icon{font-size:1.15rem;line-height:1;width:18px;text-align:center}
      .bottom-btn .btn-icon i{font-size:inherit}
    .bottom-btn .btn-text{font-size:0.8rem;font-weight:500}
    .share-btns-row{display:flex;gap:16px;justify-content:center;padding:20px 0}
    .social-share-btn{display:flex;flex-direction:column;align-items:center;gap:8px;padding:18px 22px;background:var(--accent-light);border:none;border-radius:18px;cursor:pointer;color:var(--accent);font-size:0.75rem;font-weight:500;transition:0.2s;font-family:inherit;min-width:80px}
    .social-share-btn svg,.social-share-btn i{width:26px;height:26px;font-size:26px;line-height:1;display:block}
    .social-share-btn:hover{background:var(--accent);color:white;transform:translateY(-4px);box-shadow:0 8px 20px rgba(59,130,246,0.3)}
    .mindmap-wechat-code{display:none;align-items:center;gap:10px;margin:4px auto 0;padding:10px 12px;border:1px solid var(--glass-border);border-radius:14px;background:var(--bg-card);color:var(--text-muted);font-size:.75rem}
    .mindmap-wechat-code.is-visible{display:flex}
    .mindmap-wechat-code img{width:82px;height:82px;object-fit:contain;background:#fff;border-radius:6px}
    @media(max-width:640px){.mindmap-wechat-code{display:none!important}}

    @media(max-width:1000px){
      .sidebar{display:none;left:auto;right:10px;top:72px;bottom:auto;width:66.666vw;max-width:calc(100vw - 20px);max-height:calc(100vh - 84px);transform:none;border-radius:22px;overflow:auto}
      .sidebar.open{display:flex;transform:none;width:66.666vw}
      .sidebar.open .sidebar-logo{display:none}
      .sidebar.open .sidebar-inner{padding:16px 14px 18px;overflow-y:auto}
      .sidebar.open .sidebar-nav{margin-top:8px;transform:none;gap:8px}
      .sidebar.open .nav-item-wrapper{display:block}
      .sidebar.open .nav-item{width:100%;min-width:0;padding:11px 16px;font-size:.92rem;transform:none!important}
      .sidebar.open .nav-item>span{display:inline}
      .sidebar.open .nav-item-wrapper.has-sub>.nav-item::after{display:block}
      .sidebar.open .nav-item-wrapper.has-sub.open>.sub-nav{display:flex!important;position:static;flex-direction:column;gap:3px;margin:4px 8px 0 18px;padding:4px 0 4px 10px;border-left:2px solid var(--accent-light)}
      .info-card{position:fixed;top:68px;left:12px;width:fit-content;max-width:calc(100% - 24px);padding:10px 12px;border-radius:16px}
      .title-row{gap:8px}
      .back-arrow{width:34px;height:34px;border-radius:10px;font-size:1.6rem}
      .info-card h3{font-size:.95rem}
      .bottom-bar{bottom:24px;left:16px;right:auto;transform:none;gap:6px}
      .bottom-btn{padding:10px;font-size:0;gap:0;min-width:40px;min-height:40px;border-radius:50%;justify-content:center}
      .bottom-btn .btn-text{display:none}
      .bottom-btn .btn-icon{font-size:1.2rem;width:auto;margin:0}
    }

    /* 紧凑屏幕统一为全视口画布：顶部导航和侧栏仅覆盖画布，不能参与 iframe 的尺寸计算。 */
    @media(max-width:1012px){
      html,body{height:100%;overflow:hidden!important}
      .main-wrapper{position:fixed;inset:0;width:100vw;height:100vh;height:100dvh;margin:0!important;overflow:hidden}
      .mindmap-iframe{overflow:hidden}
    }

    /* 微信内置 WebView 的动态视口有时会把底部安全区域提前扣除，导图自带控件因此偏上。 */
    @media(max-width:639px) and (orientation:portrait){
      html.is-wechat .main-wrapper{height:auto;bottom:-70px}
    }

    /* 知悉导图在中等宽度会切入不带缩放栏的内部布局。
       保持外部页面自适应，同时让嵌入模块以稳定桌面宽度渲染后等比缩放。 */
    @media(min-width:640px) and (max-width:1012px){
      .mindmap-iframe.is-scaled iframe{width:1024px;height:var(--mindmap-embed-height);transform:scale(var(--mindmap-embed-scale));transform-origin:top left}
    }

    @media(min-width:1001px){
      .desktop-actions{top:24px;right:24px}
    }

    /* ===== 弹窗 ===== */
    .help-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.5);backdrop-filter:blur(4px);z-index:1000;display:none;align-items:center;justify-content:center;animation:fadeIn 0.25s ease}
    .help-modal{max-width:480px;width:90%;background:#ffffff;border-radius:32px;padding:32px 32px 28px;border:1px solid var(--glass-border);box-shadow:0 30px 60px rgba(0,0,0,0.15);animation:slideUp 0.3s ease;position:relative;max-height:90vh;overflow-y:auto}
    .help-modal .close-btn{position:absolute;top:16px;right:20px;background:transparent;border:none;font-size:1.6rem;cursor:pointer;color:var(--text-muted);transition:0.2s;line-height:1}
    .help-modal .close-btn:hover{color:var(--text-primary);transform:rotate(90deg)}
    .help-modal h2{font-size:1.5rem;font-weight:700;margin-bottom:4px;color:var(--text-primary);display:flex;align-items:center;gap:10px}
    .help-modal .subtitle{font-size:0.85rem;color:var(--text-secondary);margin-bottom:24px}
    .help-item{display:flex;align-items:flex-start;gap:14px;padding:14px 0;border-bottom:1px solid var(--glass-border)}
    .help-item:last-child{border-bottom:none}
    .help-item .icon-box{width:40px;height:40px;min-width:40px;border-radius:12px;background:var(--accent-light);display:flex;align-items:center;justify-content:center;font-size:1.2rem;color:var(--accent)}
    .help-item .content h4{font-size:0.95rem;font-weight:600;color:var(--text-primary);margin-bottom:2px}
    .help-item .content p{font-size:0.8rem;color:var(--text-secondary);line-height:1.4}
    .help-modal .footer-tip{margin-top:20px;text-align:center;font-size:0.75rem;color:var(--text-muted)}
    .help-modal--share{max-width:400px}
    .help-modal--reward{max-width:380px;text-align:center}
    .help-modal--comments{max-width:560px}
    .share-url{margin-top:12px}
    .share-url span{word-break:break-all;font-size:.7rem}
    .reward-qrcode{width:180px;height:180px;border-radius:16px;margin:16px auto;display:block;box-shadow:var(--shadow-md)}
    .reward-empty{padding:30px 0;color:var(--text-muted);font-size:.85rem}
    .reward-empty-icon{font-size:2rem;margin-bottom:10px}
    .reward-empty-hint{font-size:.7rem;margin-top:6px}
    .comments-modal-title{display:flex;align-items:center;gap:10px;margin-bottom:4px}
    .comments-modal-title svg{width:24px;height:24px;color:var(--accent)}
    .comments-modal-title h2{font-size:1.3rem;font-weight:700}
    .comments-modal-body{margin-top:16px}
    @media(max-width:600px){.help-modal{padding:24px 20px 20px;border-radius:24px}.help-modal h2{font-size:1.2rem}}

    /* 深色模式：让导图画布外的悬浮界面保持一致的深蓝层级。 */
    body.dark{background:#0b1120}
    body.dark .main-wrapper,
    body.dark .mindmap-iframe{background:#0b1120}
    body.dark .mindmap-iframe iframe{color-scheme:dark}
    body.dark .info-card{background:rgba(15,23,42,.94);border-color:rgba(148,163,184,.2);box-shadow:0 12px 32px rgba(0,0,0,.34)}
    body.dark .back-arrow{background:rgba(148,163,184,.12);color:#cbd5e1}
    body.dark .back-arrow:hover{background:rgba(96,165,250,.2);color:#bfdbfe}
    body.dark .info-card h3{color:#f1f5f9}
    body.dark .bottom-btn{background:rgba(15,23,42,.9);border-color:rgba(148,163,184,.22);box-shadow:0 8px 24px rgba(0,0,0,.24)}
    body.dark .bottom-btn:hover{background:#3b82f6;border-color:#60a5fa}
    body.dark .help-overlay{background:rgba(2,6,23,.72)}
    body.dark .help-modal{background:#111c2d;border-color:rgba(148,163,184,.18);box-shadow:0 30px 60px rgba(0,0,0,.4)}
    body.dark .social-share-btn{background:rgba(96,165,250,.12);color:#93c5fd}
    body.dark .social-share-btn:hover{background:#3b82f6;color:#fff}
    body.dark .mindmap-wechat-code{background:#172338;border-color:rgba(148,163,184,.18)}