/* ============================================================
   物理学科页 · 学习流程图 .phy-flow（2026-10-12 批153）
   母题承 .phy-flow/.pf-*：轨道 —— 椭圆轨道底纹 + 虚线轨道环节点
   命名空间 .phy-flow / .pf-*，只作用于物理页，不污染其他学科
   交互契约与数学版 v2 相同（主按钮列 + 上下左右拖拽），视觉独立防雷同
   配色语义：钢蓝(定位) → 靛蓝(学懂) → 深青(练熟) → 橙(修坑) → 青(记牢) → 绿(测赢)
   深浅色：浅色为主 + html[data-theme="dark"] 覆盖（不写死色，跟 --ink/--surface）
   ============================================================ */

/* ---- 容器：冷白底 + 椭圆轨道底纹（右上双轨 + 左下单轨，各带一颗卫星点） ---- */
.phy-flow{position:relative;overflow:hidden;border-radius:20px;margin:0 0 16px;padding:18px 22px 16px;
  background:#f8fbff;border:1px solid #d9e4f6;
  box-shadow:0 14px 34px -26px rgba(40,120,255,.4)}
.phy-flow::before{content:'';position:absolute;inset:0;pointer-events:none;opacity:.75;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 520 220'%3E%3Cg fill='none' stroke='%2328a0ff' stroke-opacity='.13'%3E%3Cellipse cx='452' cy='18' rx='170' ry='62'/%3E%3Cellipse cx='452' cy='18' rx='92' ry='150' transform='rotate(24 452 18)'/%3E%3C/g%3E%3Ccircle cx='284' cy='44' r='3.5' fill='%2328a0ff' fill-opacity='.28'/%3E%3Cg fill='none' stroke='%237a5cff' stroke-opacity='.11'%3E%3Cellipse cx='40' cy='212' rx='150' ry='64'/%3E%3C/g%3E%3Ccircle cx='188' cy='196' r='3' fill='%237a5cff' fill-opacity='.24'/%3E%3C/svg%3E");
  background-size:520px 220px;background-repeat:no-repeat}
.phy-flow > *{position:relative;z-index:2}

/* ---- 头部：标题 + 副标 + 三个真源徽标 ---- */
.pf-head{display:flex;align-items:flex-end;gap:14px;flex-wrap:wrap}
.pf-hl{min-width:0;flex:1 1 320px}
.pf-title{margin:0;font-size:19px;font-weight:800;letter-spacing:-.2px;color:#101c30;
  display:flex;align-items:center;gap:8px}
.pf-title .pf-em{background:linear-gradient(120deg,#28a0ff 0%,#4C5FD0 55%,#7a5cff 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent}
.pf-title .pf-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:#2a6cb0;background:rgba(40,160,255,.1);border:1px solid rgba(40,160,255,.24)}
.pf-sub{margin:7px 0 0;font-size:13px;line-height:1.75;color:#74829c;max-width:640px}
.pf-metrics{display:flex;gap:9px;flex:0 0 auto}
.pf-metric{min-width:76px;padding:7px 12px;border-radius:12px;text-align:center;
  background:#f2f7ff;border:1px solid #dfe9f8}
.pf-metric b{display:block;font-size:19px;font-weight:800;line-height:1.25;color:#101c30;
  font-variant-numeric:tabular-nums}
.pf-metric span{display:block;margin-top:2px;font-size:11.5px;color:#74829c}

/* ---- 六环主轴：轨道轨道列（auto-fit 保证 1440 视口六列一行） ---- */
.pf-axis{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,104px),1fr));
  gap:10px;margin-top:16px}
.pf-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 #e0e9f7;
  transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease}
.pf-col:hover{background:rgba(76,95,208,.045);border-color:var(--c);box-shadow:0 13px 26px -16px rgba(40,120,255,.5)}
/* 轨道轴线段：每列自带一段，首尾各取一半 —— 换行时每行仍自成一条轴 */
.pf-track{position:absolute;top:26px;left:0;right:0;height:0;pointer-events:none;z-index:0;
  border-top:2px dashed;
  border-image:linear-gradient(90deg,#4A6FA5 0%,#4C5FD0 24%,#0E7FA8 44%,#E85A28 64%,#0E9494 82%,#1F8F62 100%) 1;
  opacity:.34}
.pf-col:first-child .pf-track{left:50%}
.pf-col:last-child .pf-track{right:50%}
/* 轨道环节点：圆环 + 外圈虚线轨道环（物理母题差异点） */
.pf-dot{position:relative;z-index:2;flex:0 0 auto;width:32px;height:32px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-size:14.5px;font-weight:800;color:var(--c);background:var(--nbg);border:2px solid var(--c);
  box-shadow:0 0 0 4px var(--nbg);outline:1px dashed var(--c);outline-offset:3px;
  transition:background .16s ease,box-shadow .16s ease}
.pf-col:hover .pf-dot{background:#fff}
.pf-name{position:relative;z-index:2;margin-top:10px;font-size:15px;font-weight:800;color:#101c30;
  letter-spacing:-.1px}
.pf-desc{margin-top:6px;font-size:12px;line-height:1.65;color:#69758f}

/* ---- 按钮列：每列第 1 个 = 主按钮（实心主色 + 箭头）；徽标 = 真源数字 ---- */
.pf-btns{display:flex;flex-direction:column;gap:6px;width:100%;margin-top:10px}
.pf-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:#3a4660;
  background:#f1f6fd;border:1px solid #dfe9f8;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}
.pf-btn:hover{background:#fff;border-color:var(--c);color:var(--c);transform:translateY(-1px)}
.pf-btn:active{cursor:grabbing}
.pf-btn-main{color:#fff;background:var(--c);border-color:transparent;box-shadow:0 8px 16px -9px var(--c)}
.pf-btn-main:hover{background:var(--c);color:#fff;filter:brightness(1.07);transform:translateY(-1px)}
.pf-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")}
.pf-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:#fff;color:var(--c);white-space:nowrap;
  border:1px solid var(--c);font-variant-numeric:tabular-nums;box-shadow:0 2px 6px -3px rgba(40,120,255,.45)}
.pf-btn.pf-dragging{opacity:.38}
.pf-col.pf-over{border-color:var(--c)}
.pf-btn.pf-ins-top{box-shadow:inset 0 2px 0 var(--c)}
.pf-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） ---- */
.pf-foot{display:flex;align-items:center;gap:5px;flex-wrap:wrap;
  margin-top:14px;padding-top:12px;border-top:1px dashed #dfe8f7}
.pf-foot-lab{flex:0 0 auto;font-size:11px;font-weight:700;color:#96a1b6;letter-spacing:0}
.pf-chip{display:inline-flex;align-items:center;gap:4px;padding:4px 8px;border-radius:999px;
  font-size:11.5px;font-weight:700;color:#46587a;text-decoration:none;
  background:#f2f7ff;border:1px solid #dfe9f8;
  transition:background .15s ease,color .15s ease,border-color .15s ease,transform .15s ease}
.pf-chip:hover{background:#2a6cb0;color:#fff;border-color:transparent;transform:translateY(-1px)}
.pf-sep{flex:0 0 auto;width:1px;height:15px;background:#dfe8f7;margin:0 3px}
.pf-hint{position:relative;z-index:2;margin-top:11px;font-size:11.5px;line-height:1.6;color:#96a1b6}

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

/* ============================================================
   深色：夜航轨道（轨道留、底纹留、底换深空）
   ============================================================ */
html[data-theme="dark"] .phy-flow{
  background:var(--surface,#161b2c);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"] .phy-flow::before{
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 520 220'%3E%3Cg fill='none' stroke='%2328e0ff' stroke-opacity='.2'%3E%3Cellipse cx='452' cy='18' rx='170' ry='62'/%3E%3Cellipse cx='452' cy='18' rx='92' ry='150' transform='rotate(24 452 18)'/%3E%3C/g%3E%3Ccircle cx='284' cy='44' r='3.5' fill='%2328e0ff' fill-opacity='.34'/%3E%3Cg fill='none' stroke='%237a5cff' stroke-opacity='.18'%3E%3Cellipse cx='40' cy='212' rx='150' ry='64'/%3E%3C/g%3E%3Ccircle cx='188' cy='196' r='3' fill='%237a5cff' fill-opacity='.3'/%3E%3C/svg%3E")}
html[data-theme="dark"] .pf-title{color:var(--ink,#fff)}
html[data-theme="dark"] .pf-title .pf-ax{color:#8ed0ff;background:rgba(40,224,255,.12);
  border-color:rgba(40,224,255,.3)}
html[data-theme="dark"] .pf-sub{color:var(--ink-3)}
html[data-theme="dark"] .pf-metric{background:rgba(255,255,255,.05);
  border-color:var(--hair-strong,rgba(255,255,255,.13))}
html[data-theme="dark"] .pf-metric b{color:var(--ink,#fff)}
html[data-theme="dark"] .pf-metric span{color:var(--ink-3)}
html[data-theme="dark"] .pf-col{--nbg:var(--surface,#1E1B2E);background:transparent;border-color:var(--hair-strong,rgba(255,255,255,.13))}
html[data-theme="dark"] .pf-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"] .pf-dot{background:var(--surface,#161b2c);box-shadow:0 0 0 4px var(--surface,#161b2c)}
html[data-theme="dark"] .pf-col:hover .pf-dot{background:var(--surface,#161b2c)}
html[data-theme="dark"] .pf-name{color:var(--ink,#fff)}
html[data-theme="dark"] .pf-desc{color:var(--ink-3)}
html[data-theme="dark"] .pf-btn{color:#c4cde0;background:rgba(255,255,255,.05);
  border-color:rgba(255,255,255,.14)}
html[data-theme="dark"] .pf-btn:hover{background:rgba(255,255,255,.11);border-color:var(--c);color:#eef1fb;transform:translateY(-1px)}
html[data-theme="dark"] .pf-btn-main{color:#fff;background:var(--c);border-color:transparent}
html[data-theme="dark"] .pf-btn-main:hover{background:var(--c);color:#fff;filter:brightness(1.1)}
html[data-theme="dark"] .pf-badge{background:#182238;color:#cdd9f0;border-color:rgba(255,255,255,.24);box-shadow:0 2px 6px -3px rgba(0,0,0,.55)}
html[data-theme="dark"] .pf-btn-main .pf-badge{background:rgba(255,255,255,.25);color:#fff}
html[data-theme="dark"] .pf-foot{border-top-color:var(--hair-strong,rgba(255,255,255,.13))}
html[data-theme="dark"] .pf-foot-lab{color:var(--ink-3,#8a93ad)}
html[data-theme="dark"] .pf-chip{background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.14);color:#c4cde0}
html[data-theme="dark"] .pf-chip:hover{background:#2a6cb0;color:#fff;border-color:transparent}
html[data-theme="dark"] .pf-sep{background:rgba(255,255,255,.14)}
html[data-theme="dark"] .pf-hint{color:var(--ink-3,#8a93ad)}
html[data-theme="dark"] .pf-track{opacity:.5}

/* ============================================================
   [批168] 六步动线（物理 · 导线轨迹母题）
   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 .pf-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）
   ============================================================ */
.pf-flow-wrap{position:relative}
.pf-flow{position:absolute;top:0;left:0;z-index:0;pointer-events:none;overflow:visible}
.pf-base{fill:none;stroke:#E6E9F8;stroke-width:3;stroke-linecap:round;opacity:.8}
.pf-arc{fill:none;stroke:url(#pfGrad);stroke-width:3;stroke-linecap:round;
  filter:drop-shadow(0 1px 3px rgba(76,95,208,.26))}
.pf-flowdash{fill:none;stroke:#fff;stroke-width:2.6;stroke-linecap:round;
  stroke-dasharray:16 58;animation:pfFlow 1.7s linear infinite}
.pf-head{fill:#4C5FD0}
@keyframes pfFlow{from{stroke-dashoffset:0}to{stroke-dashoffset:-74}}

/* 动线上的节点：命中高亮 / 未命中淡化 */
.pf-btn.is-active{border-color:var(--c);
  box-shadow:0 0 0 2px var(--c),0 14px 26px -14px rgba(76,95,208,.55);transform:translateY(-1px)}
.pf-btn.is-dim{opacity:.42;filter:saturate(.55)}
.pf-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 */
.pf-form{display:block;margin-top:1px;font-size:10.5px;font-weight:600;font-style:normal;color:#69758f;letter-spacing:.5px}
.pf-core-dot{flex:0 0 auto;width:5px;height:5px;border-radius:50%;background:#4C5FD0;
  box-shadow:0 0 0 2px rgba(76,95,208,.18)}
.pf-btn-main .pf-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 */
.pf-routes{position:relative;z-index:3;display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-top:13px}
.pf-routes-lab{flex:0 0 auto;font-size:12px;font-weight:800;color:#101c30;letter-spacing:.2px}
.pf-route{appearance:none;cursor:pointer;font-family:inherit;font-size:12px;font-weight:700;color:#101c30;
  padding:5px 11px;border-radius:999px;background:rgba(76,95,208,.07);border:1px solid rgba(76,95,208,.2);
  transition:background .15s ease,color .15s ease,border-color .15s ease,transform .15s ease}
.pf-route:hover{background:#fff;border-color:#4C5FD0;color:#4C5FD0;transform:translateY(-1px)}
.pf-route.on{color:#fff;background:linear-gradient(120deg,#4A6FA5,#4C5FD0);border-color:transparent;
  box-shadow:0 8px 16px -9px rgba(76,95,208,.6)}
.pf-route[data-route="advice"].on{background:linear-gradient(120deg,#4C5FD0,#E85A28);
  animation:pfRoutePulse 2.4s ease-in-out infinite}
@keyframes pfRoutePulse{0%,100%{box-shadow:0 8px 16px -9px rgba(76,95,208,.6)}
  50%{box-shadow:0 8px 22px -6px rgba(232,90,40,.66)}}

/* 小伴建议条（真学情话术） */
.pf-advice{position:relative;z-index:3;display:none;margin-top:11px;font-size:12.5px;line-height:1.65;color:#28a0ff;
  background:rgba(76,95,208,.07);border:1px solid rgba(76,95,208,.18);border-radius:10px;padding:8px 12px}
.pf-advice .pf-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(76,95,208,.35)}

/* ---- 深色：夜航档 ---- */
html[data-theme="dark"] .pf-base{stroke:rgba(255,255,255,.16)}
html[data-theme="dark"] .pf-flowdash{stroke:var(--surface,#141220)}
html[data-theme="dark"] .pf-head{fill:#97A2E4}
html[data-theme="dark"] .pf-form{color:var(--ink-3,#8a93ad)}
html[data-theme="dark"] .pf-core-dot{background:#97A2E4;box-shadow:0 0 0 2px rgba(76,95,208,.22)}
html[data-theme="dark"] .pf-btn-main .pf-core-dot{background:#fff;box-shadow:0 0 0 2px rgba(255,255,255,.4)}
html[data-theme="dark"] .pf-routes-lab{color:var(--ink-2,#b9c1d6)}
html[data-theme="dark"] .pf-route{color:var(--ink-2,#b9c1d6);background:rgba(255,255,255,.05);border-color:rgba(255,255,255,.14)}
html[data-theme="dark"] .pf-route:hover{background:rgba(255,255,255,.1);color:#97A2E4;border-color:#4C5FD0}
html[data-theme="dark"] .pf-route.on{color:#fff}
html[data-theme="dark"] .pf-advice{color:#97A2E4;background:rgba(76,95,208,.13);border-color:rgba(76,95,208,.3)}