/* 第二章 防火 · 思维导图 —— 与全站同一套墨绿配色 */
html,body{height:100%}
body{margin:0;background:#f4f6f3;color:#243b33;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif;line-height:1.6;overscroll-behavior:none}
.fm-app{display:flex;flex-direction:column;height:100vh;height:100dvh}

/* 顶栏 */
.fm-top{display:flex;align-items:center;gap:12px;padding:10px 16px;background:#fff;border-bottom:1px solid #dce5de;flex:none}
.fm-back{width:34px;height:34px;flex:none;display:grid;place-items:center;border-radius:9px;background:#edf5ef;border:1px solid #c7dacd;color:#185e49;text-decoration:none;font-size:16px}
.fm-back:hover{background:#e0eee4}
.fm-titles{flex:1;min-width:0}
.fm-titles h1{margin:0;font-size:16px;letter-spacing:.01em;color:#1d322b;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fm-titles p{margin:1px 0 0;font-size:11.5px;color:#7b8f86;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fm-legend{display:flex;gap:12px;font-size:11.5px;color:#60756b;flex:none}
.fm-legend span{display:flex;align-items:center;gap:5px}
.dot{width:9px;height:9px;border-radius:3px;display:inline-block}
.dot.mastery{background:#c85a3d}
.dot.understand{background:#3d7ea6}

/* 工具条 */
.fm-bar{display:flex;align-items:center;gap:14px;flex-wrap:wrap;padding:8px 16px;background:#fbfdfa;border-bottom:1px solid #e4ebe5;flex:none}
.fm-group{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.fm-group.fm-search{flex:1;min-width:180px}
.fm-levels{display:flex;gap:4px;padding-left:8px;margin-left:4px;border-left:1px solid #dce5de}
.fm-btn{font:inherit;font-size:12.5px;font-weight:600;color:#185e49;background:#fff;border:1px solid #c7dacd;border-radius:7px;padding:5px 10px;min-height:32px;cursor:pointer;white-space:nowrap}
.fm-btn.fm-link{display:inline-flex;align-items:center;text-decoration:none}
.fm-btn.fm-link::before{content:"▤";margin-right:5px;font-size:11px;opacity:.75}
.fm-btn:hover{background:#edf5ef;border-color:#8db49b}
.fm-btn.on{background:#185e49;border-color:#185e49;color:#fff}
.fm-btn:focus-visible{outline:2px solid #69a88a;outline-offset:2px}
.fm-search input{flex:1;min-width:0;font:inherit;font-size:12.5px;padding:6px 10px;min-height:32px;border:1px solid #b8cbbf;border-radius:7px;background:#fff;color:#243b33}
.fm-search input:focus{outline:2px solid #69a88a;outline-offset:1px;border-color:#69a88a}
.fm-count{font-size:11.5px;color:#7b8f86;white-space:nowrap}
.only-mobile{display:none}

/* 画布 */
.fm-stage{position:relative;flex:1;min-height:0;background:#f4f6f3}
.fm-map{width:100%;height:100%}
.fm-map .map-container{background:radial-gradient(circle at 1px 1px,#dfe8e1 1px,transparent 0) 0 0/22px 22px,#f4f6f3}
.fm-hint{position:absolute;left:16px;bottom:12px;margin:0;font-size:11.5px;color:#93a49b;pointer-events:none}

/* 节点外观 */
.fm-map me-tpc,.fm-map .me-tpc{font-family:inherit;line-height:1.45;letter-spacing:.01em}
.fm-map .me-tpc[data-depth="0"]{font-weight:650}
.fm-map .me-tpc:not([contenteditable="true"]){cursor:pointer}

/* 详情抽屉 */
.fm-detail{position:absolute;top:12px;right:12px;bottom:12px;width:min(380px,42vw);background:#fff;border:1px solid #d7e2d9;border-radius:14px;box-shadow:0 12px 32px #25473614;padding:16px 18px 18px;overflow:auto;display:flex;flex-direction:column;gap:10px;z-index:5}
.fm-detail[hidden]{display:none}
.fm-detail .d-head{display:flex;align-items:flex-start;gap:8px}
.fm-detail .d-badge{font-size:11px;font-weight:650;padding:2px 7px;border-radius:5px;flex:none;margin-top:3px}
.fm-detail .d-badge.mastery{background:#fbeae4;color:#a74630}
.fm-detail .d-badge.understand{background:#e8f0f6;color:#2f5f7d}
.fm-detail .d-badge.concept{background:#eef3ef;color:#4f6f63}
.fm-detail h2{margin:0;font-size:16px;line-height:1.5;color:#1d322b;flex:1}
.fm-detail .d-close{flex:none;width:28px;height:28px;border:1px solid #dbe6de;background:#fff;border-radius:7px;color:#60756b;cursor:pointer;font-size:14px;line-height:1}
.fm-detail .d-close:hover{background:#f2f7f3}
.fm-detail .d-clause{margin:0;font-size:11.5px;color:#7b8f86;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;line-height:1.7;word-break:break-all}
.fm-detail .d-text{margin:0;font-size:14px;line-height:1.85;color:#2c433a}
.fm-detail .d-meta{margin:0;font-size:12px;color:#7b8f86}
.fm-detail .d-link{margin-top:auto;font-size:13px;font-weight:600;color:#185e49;text-decoration:none;padding-top:6px}
.fm-detail .d-link:hover{text-decoration:underline}
.fm-detail .d-toggle{font:inherit;font-size:13px;font-weight:600;color:#185e49;background:#edf5ef;border:1px solid #c7dacd;border-radius:8px;padding:7px 12px;min-height:38px;cursor:pointer;align-self:flex-start}
.fm-detail .d-toggle:hover{background:#e0eee4;border-color:#8db49b}

/* 移动端：详情改成底部抽屉 */
@media (max-width:820px){
  .fm-top{padding:8px 12px}
  .fm-titles h1{font-size:15px}
  .fm-titles p{font-size:11px}
  .fm-legend{display:none}
  .fm-bar{gap:8px;padding:8px 12px}
  .fm-group.fm-search{order:-1;flex-basis:100%}
  .fm-btn{font-size:12px;padding:5px 9px;min-height:34px}
  .only-mobile{display:inline-block}
  .fm-detail{position:absolute;left:0;right:0;top:auto;bottom:0;width:auto;max-height:56%;border-radius:16px 16px 0 0;padding:14px 16px calc(16px + env(safe-area-inset-bottom))}
  .fm-detail::before{content:"";display:block;width:38px;height:4px;border-radius:2px;background:#dbe6de;margin:-4px auto 8px}
  .fm-detail h2{font-size:15px}
  .fm-detail .d-text{font-size:13.5px}
  .fm-hint{display:none}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}