/* ============================================================
   历史学科页 · 学习流程图 .history-flow（2026-10-12 批158 #1014）
   母题承 .history-flow/.hf-*：青铜古卷 —— 米黄纸底 + 竹简竖纹 + 竹牌节点 + 编绳点线
   命名空间 .history-flow / .hf-*，只作用于历史页，不污染其他学科
   交互契约与数学/物理/化学/语文/生物版相同（主按钮列 + 上下左右拖拽），视觉独立防雷同
   配色语义：赭金(定位) → 古铜(学懂) → 铜绿(练熟) → 朱砂(修坑) → 青灰(记牢) → 橄榄(测赢)
   深浅色：浅色为主 + html[data-theme="dark"] 覆盖（不写死色，跟 --ink/--surface）
   ============================================================ */

/* ---- 容器：米黄卷底 + 竹简竖纹（等宽竹条，右上角一卷竹简剪影） ---- */
.history-flow{position:relative;overflow:hidden;border-radius:20px;margin:0 0 16px;padding:18px 22px 16px;
  background:#faf5e8;border:1px solid #e6d9b8;
  box-shadow:0 14px 34px -26px rgba(139,90,43,.42)}
.history-flow::before{content:'';position:absolute;inset:0;pointer-events:none;opacity:.8;
  background-image:
    repeating-linear-gradient(90deg,rgba(139,90,43,.075) 0 26px,rgba(139,90,43,.16) 26px 28px),
    repeating-linear-gradient(0deg,transparent 0 54px,rgba(160,120,60,.06) 54px 55px);
  -webkit-mask-image:radial-gradient(120% 130% at 100% 0%,#000 20%,transparent 88%);
  mask-image:radial-gradient(120% 130% at 100% 0%,#000 20%,transparent 88%)}
.history-flow::after{content:'📜';position:absolute;top:8px;right:16px;font-size:42px;line-height:1;
  opacity:.1;pointer-events:none;filter:grayscale(30%)}
.history-flow > *{position:relative;z-index:2}

/* ---- 头部：标题 + 副标 + 三个真源徽标 ---- */
.hf-head{display:flex;align-items:flex-end;gap:14px;flex-wrap:wrap}
.hf-hl{min-width:0;flex:1 1 320px}
.hf-title{margin:0;font-size:19px;font-weight:800;letter-spacing:-.2px;color:#2e2312;
  display:flex;align-items:center;gap:8px}
.hf-title .hf-em{background:linear-gradient(120deg,#8B5A2B 0%,#C0392B 55%,#3E8E7E 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}
.hf-title .hf-ax{display:inline-flex;align-items:center;justify-content:center;
  padding:3px 9px;border-radius:999px;font-size:11px;font-weight:700;letter-spacing:.3px;
  color:#8B5A2B;background:rgba(139,90,43,.09);border:1px solid rgba(139,90,43,.28)}
.hf-sub{margin:7px 0 0;font-size:13px;line-height:1.75;color:#8a7a5e;max-width:640px}
.hf-metrics{display:flex;gap:9px;flex:0 0 auto}
.hf-metric{min-width:76px;padding:7px 12px;border-radius:12px;text-align:center;
  background:#f4ecd8;border:1px solid #e6d9b8}
.hf-metric b{display:block;font-size:19px;font-weight:800;line-height:1.25;color:#2e2312;
  font-variant-numeric:tabular-nums}
.hf-metric span{display:block;margin-top:2px;font-size:11.5px;color:#8a7a5e}

/* ---- 六环主轴：长河列（auto-fit 保证 1440 视口六列一行） ---- */
.hf-axis{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,104px),1fr));
  gap:10px;margin-top:16px}
.hf-col{/*[批168] 列卡片透明：动线走下层时只被按钮本身挡住*/--nbg:position:relative;display:flex;flex-direction:column;align-items:flex-start;
  min-width:0;padding:11px 10px 10px;border-radius:14px;background:transparent;border:1px solid #e6d9b8;
  transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease}.hf-col:hover{background:rgba(139,90,43,.045);#fffdf4;border-color:var(--c);box-shadow:0 13px 26px -16px rgba(139,90,43,.46)}
/* 编绳段：每列自带一段（点线 = 竹简编绳），首尾各取一半 —— 换行时每行仍自成一条链 */
.hf-track{position:absolute;top:29px;left:0;right:0;height:0;pointer-events:none;z-index:0;
  border-top:2px dotted;
  border-image:linear-gradient(90deg,#A0783C 0%,#8B5A2B 24%,#3E8E7E 44%,#C2562B 64%,#4E7A8A 82%,#6B7C3A 100%) 1;
  opacity:.42}
.hf-col:first-child .hf-track{left:50%}
.hf-col:last-child .hf-track{right:50%}
/* 竹牌节点：竖长方牌（母题差异点，白字编号 + 内圈刻痕双框） */
.hf-dot{position:relative;z-index:2;flex:0 0 auto;width:27px;height:33px;margin:2px 0 2px;
  display:flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:800;color:#fff;background:var(--c);border-radius:5px;
  box-shadow:inset 0 0 0 2px rgba(255,255,255,.42);
  transition:filter .16s ease}
.hf-col:hover .hf-dot{filter:brightness(1.12)}
.hf-name{position:relative;z-index:2;margin-top:8px;font-size:15px;font-weight:800;color:#2e2312;
  letter-spacing:-.1px}
.hf-desc{margin-top:6px;font-size:12px;line-height:1.65;color:#77684c}

/* ---- 按钮列：每列第 1 个 = 主按钮（实心主色 + 箭头）；徽标 = 真源数字 ---- */
.hf-btns{display:flex;flex-direction:column;gap:6px;width:100%;margin-top:10px}
.hf-btn{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:5px;
  width:100%;padding:7px 9px;border-radius:9px;font-size:12px;font-weight:700;text-decoration:none;color:#574a2e;
  background:#f4ecd8;border:1px solid #e6d9b8;cursor:grab;font-family:inherit;line-height:1.4;text-align:left;
  transition:background .15s ease,color .15s ease,border-color .15s ease,box-shadow .15s ease,transform .15s ease}
.hf-btn:hover{background:#fffdf4;border-color:var(--c);color:var(--c);transform:translateY(-1px)}
.hf-btn:active{cursor:grabbing}
.hf-btn-main{color:#fff;background:var(--c);border-color:transparent;box-shadow:0 8px 16px -9px var(--c)}
.hf-btn-main:hover{background:var(--c);color:#fff;filter:brightness(1.07);transform:translateY(-1px)}
.hf-btn-main::after{content:'';flex:0 0 auto;width:11px;height:11px;background:currentColor;opacity:.9;
  -webkit-mask:no-repeat center/contain url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12h14M13 5l7 7-7 7'/%3E%3C/svg%3E");
  mask:no-repeat center/contain url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12h14M13 5l7 7-7 7'/%3E%3C/svg%3E")}
.hf-badge{position:absolute;top:-7px;right:5px;z-index:3;font-style:normal;font-size:10px;font-weight:800;
  line-height:1;padding:3px 6px;border-radius:999px;background:#fffdf4;color:var(--c);white-space:nowrap;
  border:1px solid var(--c);font-variant-numeric:tabular-nums;box-shadow:0 2px 6px -3px rgba(139,90,43,.45)}
.hf-btn.hf-dragging{opacity:.38}
.hf-col.hf-over{border-color:var(--c)}
.hf-btn.hf-ins-top{box-shadow:inset 0 2px 0 var(--c)}
.hf-btn span{flex:1 1 0%;min-width:0;word-break:break-all;text-align:left}

/* ---- 底部：聊思路 · 看结果 · 找同伴（芯片行） ---- */
.hf-foot{display:flex;align-items:center;gap:5px;flex-wrap:wrap;
  margin-top:14px;padding-top:12px;border-top:1px dashed #e6d9b8}
.hf-foot-lab{flex:0 0 auto;font-size:11px;font-weight:700;color:#a3946e;letter-spacing:0}
.hf-chip{display:inline-flex;align-items:center;gap:4px;padding:4px 8px;border-radius:999px;
  font-size:11.5px;font-weight:700;color:#6d5c38;text-decoration:none;
  background:#f4ecd8;border:1px solid #e6d9b8;
  transition:background .15s ease,color .15s ease,border-color .15s ease,transform .15s ease}
.hf-chip:hover{background:#8B5A2B;color:#fff;border-color:transparent;transform:translateY(-1px)}
.hf-sep{flex:0 0 auto;width:1px;height:15px;background:#e6d9b8;margin:0 3px}
.hf-hint{position:relative;z-index:2;margin-top:11px;font-size:11.5px;line-height:1.6;color:#a3946e}

/* ---- 窄屏 ---- */
@media (max-width:900px){
  .history-flow{padding:16px 15px 14px}
  .hf-metrics{flex-wrap:wrap}
  .hf-axis{grid-template-columns:repeat(auto-fit,minmax(min(100%,150px),1fr))}
}

/* ============================================================
   深色：夜拓古卷（竹纹留、牌留、底换深褐）
   ============================================================ */
html[data-theme="dark"] .history-flow{
  background:var(--surface,#211c13);border-color:var(--hair-strong,rgba(255,255,255,.14));
  box-shadow:0 14px 34px -26px rgba(0,0,0,.66)}
html[data-theme="dark"] .history-flow::before{
  background-image:
    repeating-linear-gradient(90deg,rgba(212,175,110,.09) 0 26px,rgba(212,175,110,.18) 26px 28px),
    repeating-linear-gradient(0deg,transparent 0 54px,rgba(212,175,110,.07) 54px 55px)}
html[data-theme="dark"] .history-flow::after{opacity:.14}
html[data-theme="dark"] .hf-title{color:var(--ink,#fff)}
html[data-theme="dark"] .hf-title .hf-ax{color:#d9b877;background:rgba(212,175,110,.1);
  border-color:rgba(212,175,110,.3)}
html[data-theme="dark"] .hf-sub{color:var(--ink-3)}
html[data-theme="dark"] .hf-metric{background:rgba(255,255,255,.05);
  border-color:var(--hair-strong,rgba(255,255,255,.13))}
html[data-theme="dark"] .hf-metric b{color:var(--ink,#fff)}
html[data-theme="dark"] .hf-metric span{color:var(--ink-3)}
html[data-theme="dark"] .hf-col{--nbg:var(--surface,#1E1B2E);background:transparent;border-color:var(--hair-strong,rgba(255,255,255,.13))}
html[data-theme="dark"] .hf-col:hover{background:rgba(255,255,255,.045);border-color:var(--c);box-shadow:0 13px 26px -16px rgba(0,0,0,.65)}
html[data-theme="dark"] .hf-name{color:var(--ink,#fff)}
html[data-theme="dark"] .hf-desc{color:var(--ink-3)}
html[data-theme="dark"] .hf-btn{color:#d9cdaa;background:rgba(255,255,255,.05);
  border-color:rgba(255,255,255,.14)}
html[data-theme="dark"] .hf-btn:hover{background:rgba(255,255,255,.11);border-color:var(--c);color:#f3ecd7;transform:translateY(-1px)}
html[data-theme="dark"] .hf-btn-main{color:#fff;background:var(--c);border-color:transparent}
html[data-theme="dark"] .hf-btn-main:hover{background:var(--c);color:#fff;filter:brightness(1.1)}
html[data-theme="dark"] .hf-badge{background:#282216;color:#ecdfc0;border-color:rgba(255,255,255,.24);box-shadow:0 2px 6px -3px rgba(0,0,0,.55)}
html[data-theme="dark"] .hf-btn-main .hf-badge{background:rgba(255,255,255,.25);color:#fff}
html[data-theme="dark"] .hf-foot{border-top-color:var(--hair-strong,rgba(255,255,255,.13))}
html[data-theme="dark"] .hf-foot-lab{color:var(--ink-3,#8a93ad)}
html[data-theme="dark"] .hf-chip{background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.14);color:#d9cdaa}
html[data-theme="dark"] .hf-chip:hover{background:#8B5A2B;color:#fff;border-color:transparent}
html[data-theme="dark"] .hf-sep{background:rgba(255,255,255,.14)}
html[data-theme="dark"] .hf-hint{color:var(--ink-3,#8a93ad)}
html[data-theme="dark"] .hf-track{opacity:.55}

/* ============================================================
   [批168] 六步动线（历史 · 编年长河母题）
   交互契约与数学/英语版完全一致：动线连「按钮 → 按钮」，走列卡片**下层**——
   本段上方已把 .hf-col 改成透明，线只在按钮处被挡，列内空白与列间缝隙全程可见。
   （英语页看得清正是这个原因；此前各科列卡片是实心色，下层线被整列遮死）
   渐变 = 本科六环自身配色，跨科不雷同；箭头只在跨环弧上（同列直连段不画，避免浮点瑕疵）
   ============================================================ */
.hf-flow-wrap{position:relative}
.hf-flow{position:absolute;top:0;left:0;z-index:0;pointer-events:none;overflow:visible}
.hf-base{fill:none;stroke:#EFE8E1;stroke-width:3;stroke-linecap:round;opacity:.8}
.hf-arc{fill:none;stroke:url(#hfGrad);stroke-width:3;stroke-linecap:round;
  filter:drop-shadow(0 1px 3px rgba(139,90,43,.26))}
.hf-flowdash{fill:none;stroke:#fff;stroke-width:2.6;stroke-linecap:round;
  stroke-dasharray:16 58;animation:hfFlow 1.7s linear infinite}
.hf-head{fill:#8B5A2B}
@keyframes hfFlow{from{stroke-dashoffset:0}to{stroke-dashoffset:-74}}

/* 动线上的节点：命中高亮 / 未命中淡化 */
.hf-btn.is-active{border-color:var(--c);
  box-shadow:0 0 0 2px var(--c),0 14px 26px -14px rgba(139,90,43,.55);transform:translateY(-1px)}
.hf-btn.is-dim{opacity:.42;filter:saturate(.55)}
.hf-btn.is-dim:hover{opacity:.75}

/* 环节正式名辅注（诊断/学习/练习/纠错/复习/测验）+ 8 张核心能力卡小点 */
.hf-form{display:block;margin-top:1px;font-size:10.5px;font-weight:600;font-style:normal;color:#77684c;letter-spacing:.5px}
.hf-core-dot{flex:0 0 auto;width:5px;height:5px;border-radius:50%;background:#8B5A2B;
  box-shadow:0 0 0 2px rgba(139,90,43,.18)}
.hf-btn-main .hf-core-dot{background:#fff;box-shadow:0 0 0 2px rgba(255,255,255,.4)}

/* 今天想怎么走 · 动线芯片 */
.hf-routes{position:relative;z-index:3;display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-top:13px}
.hf-routes-lab{flex:0 0 auto;font-size:12px;font-weight:800;color:#2e2312;letter-spacing:.2px}
.hf-route{appearance:none;cursor:pointer;font-family:inherit;font-size:12px;font-weight:700;color:#2e2312;
  padding:5px 11px;border-radius:999px;background:rgba(139,90,43,.07);border:1px solid rgba(139,90,43,.2);
  transition:background .15s ease,color .15s ease,border-color .15s ease,transform .15s ease}
.hf-route:hover{background:#fff;border-color:#8B5A2B;color:#8B5A2B;transform:translateY(-1px)}
.hf-route.on{color:#fff;background:linear-gradient(120deg,#A0783C,#8B5A2B);border-color:transparent;
  box-shadow:0 8px 16px -9px rgba(139,90,43,.6)}
.hf-route[data-route="advice"].on{background:linear-gradient(120deg,#8B5A2B,#C2562B);
  animation:hfRoutePulse 2.4s ease-in-out infinite}
@keyframes hfRoutePulse{0%,100%{box-shadow:0 8px 16px -9px rgba(139,90,43,.6)}
  50%{box-shadow:0 8px 22px -6px rgba(194,86,43,.66)}}

/* 小伴建议条（真学情话术） */
.hf-advice{position:relative;z-index:3;display:none;margin-top:11px;font-size:12.5px;line-height:1.65;color:#8B5A2B;
  background:rgba(139,90,43,.07);border:1px solid rgba(139,90,43,.18);border-radius:10px;padding:8px 12px}
.hf-advice .hf-mascot-ico{display:inline-block;width:22px;height:22px;margin-right:5px;vertical-align:-6px;
  border-radius:50%;object-fit:cover;background:#fff;box-shadow:0 2px 5px -2px rgba(139,90,43,.35)}

/* ---- 深色：夜航档 ---- */
html[data-theme="dark"] .hf-base{stroke:rgba(255,255,255,.16)}
html[data-theme="dark"] .hf-flowdash{stroke:var(--surface,#141220)}
html[data-theme="dark"] .hf-head{fill:#BC9F84}
html[data-theme="dark"] .hf-form{color:var(--ink-3,#8a93ad)}
html[data-theme="dark"] .hf-core-dot{background:#BC9F84;box-shadow:0 0 0 2px rgba(139,90,43,.22)}
html[data-theme="dark"] .hf-btn-main .hf-core-dot{background:#fff;box-shadow:0 0 0 2px rgba(255,255,255,.4)}
html[data-theme="dark"] .hf-routes-lab{color:var(--ink-2,#b9c1d6)}
html[data-theme="dark"] .hf-route{color:var(--ink-2,#b9c1d6);background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.14)}
html[data-theme="dark"] .hf-route:hover{background:rgba(255,255,255,.1);color:#BC9F84;border-color:#8B5A2B}
html[data-theme="dark"] .hf-route.on{color:#fff}
html[data-theme="dark"] .hf-advice{color:#BC9F84;background:rgba(139,90,43,.13);border-color:rgba(139,90,43,.3)}