/* ==========================================================
   回旋加速器实验室 · 设计系统
   HUD / Sci-Fi FUI · 深色 + 明亮双主题 · 平板触控优先
   ========================================================== */

/* ---------- 1. 令牌 ---------- */
:root {
  /* 深色（默认） */
  --bg-0: #04040d;
  --bg-1: #070b16;
  --bg-glow-a: rgba(0, 229, 255, .13);
  --bg-glow-b: rgba(123, 97, 255, .16);

  --panel: rgba(12, 19, 32, .82);
  --panel-solid: #0c1320;
  --panel-hi: rgba(20, 30, 48, .92);
  --line: rgba(120, 148, 200, .20);
  --line-hi: rgba(0, 229, 255, .45);

  --fg: #E6ECFF;
  --fg-dim: #9AA8C7;
  --fg-mute: #66748F;

  --primary: #00E5FF;
  --primary-dim: rgba(0, 229, 255, .14);
  --secondary: #7B61FF;
  --secondary-dim: rgba(123, 97, 255, .16);
  --accent: #FF3DCB;

  --pos: #FF6B4A;
  --pos-dim: rgba(255, 107, 74, .18);
  --neg: #4A8BFF;
  --neg-dim: rgba(74, 139, 255, .18);
  --gain: #22C55E;
  --lose: #EF4444;
  --warn: #F59E0B;

  --shadow: 0 24px 60px -24px rgba(0, 0, 0, .9);
  --glow: 0 0 22px rgba(0, 229, 255, .35);

  --r-s: 10px;
  --r-m: 14px;
  --r-l: 20px;

  --tap: 44px;

  --font: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --ease: cubic-bezier(.22, .68, .36, 1);
  --t-fast: 140ms;
  --t-mid: 240ms;
  --t-slow: 420ms;
}

html[data-theme="light"] {
  --bg-0: #eef2f9;
  --bg-1: #f7faff;
  --bg-glow-a: rgba(14, 116, 144, .10);
  --bg-glow-b: rgba(109, 74, 255, .10);

  --panel: rgba(255, 255, 255, .88);
  --panel-solid: #ffffff;
  --panel-hi: rgba(255, 255, 255, .96);
  --line: rgba(15, 40, 80, .12);
  --line-hi: rgba(14, 116, 144, .45);

  --fg: #0d1b2e;
  --fg-dim: #4a5b76;
  --fg-mute: #7a8aa3;

  --primary: #0E7490;
  --primary-dim: rgba(14, 116, 144, .10);
  --secondary: #6D4AFF;
  --secondary-dim: rgba(109, 74, 255, .10);
  --accent: #C026D3;

  --pos: #D9480F;
  --pos-dim: rgba(217, 72, 15, .12);
  --neg: #1D6FD6;
  --neg-dim: rgba(29, 111, 214, .12);
  --gain: #15803D;
  --lose: #B91C1C;
  --warn: #B45309;

  --shadow: 0 18px 40px -22px rgba(16, 40, 80, .45);
  --glow: 0 0 18px rgba(14, 116, 144, .22);
}

/* ---------- 2. 基础 ---------- */
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { height: 100%; margin: 0; }
body {
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.55;
  color: var(--fg);
  background:
    radial-gradient(1100px 620px at 52% -12%, var(--bg-glow-a), transparent 62%),
    radial-gradient(900px 520px at 8% 108%, var(--bg-glow-b), transparent 62%),
    linear-gradient(180deg, var(--bg-1), var(--bg-0));
  background-attachment: fixed;
  overflow: hidden;
  transition: background var(--t-slow) var(--ease), color var(--t-mid) var(--ease);
}
body.teach-mode { font-size: 16.5px; }
button, input, select { font-family: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 6px; }
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 8px; }
::-webkit-scrollbar-track { background: transparent; }

/* ---------- 3. 布局外壳 ---------- */
.app { height: 100vh; height: 100dvh; display: flex; flex-direction: column; }

.topbar {
  flex: 0 0 auto;
  display: flex; align-items: center; gap: 14px;
  padding: 10px clamp(12px, 2vw, 22px);
  padding-top: calc(10px + env(safe-area-inset-top));
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(18px) saturate(1.2);
  z-index: 30;
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.brand-mark {
  width: 30px; height: 30px; flex: 0 0 auto;
  border-radius: 9px; display: grid; place-items: center;
  background: linear-gradient(140deg, var(--primary), var(--secondary));
  box-shadow: var(--glow);
}
.brand-mark svg { width: 19px; height: 19px; display: block; }
.brand-txt { min-width: 0; }
.brand-txt b { display: block; font-size: 14.5px; letter-spacing: .02em; line-height: 1.2; white-space: nowrap; }
.brand-txt span { display: block; font-size: 10.5px; color: var(--fg-mute); letter-spacing: .16em; white-space: nowrap; }

.steps {
  flex: 1 1 auto; display: flex; align-items: center; gap: 4px;
  min-width: 0; overflow-x: auto; scrollbar-width: none; padding: 2px;
}
.steps::-webkit-scrollbar { display: none; }
.step {
  --on: 0;
  display: flex; align-items: center; gap: 7px;
  padding: 7px 12px; border-radius: 999px; white-space: nowrap;
  border: 1px solid transparent; font-size: 12.5px; color: var(--fg-mute);
  transition: all var(--t-mid) var(--ease); min-height: 34px;
}
.step i {
  width: 19px; height: 19px; border-radius: 50%; display: grid; place-items: center;
  font-size: 10.5px; font-style: normal; font-family: var(--mono);
  background: var(--line); color: var(--fg-dim);
  transition: all var(--t-mid) var(--ease);
}
.step[data-state="done"] { color: var(--fg-dim); }
.step[data-state="done"] i { background: var(--primary-dim); color: var(--primary); }
.step[data-state="active"] {
  color: var(--fg); border-color: var(--line-hi); background: var(--primary-dim);
}
.step[data-state="active"] i { background: var(--primary); color: #001018; font-weight: 700; }
.step:hover { color: var(--fg); }

.top-actions { display: flex; align-items: center; gap: 8px; flex: 0 0 auto; margin-left: auto; }
.icon-btn {
  width: var(--tap); height: 40px; border-radius: 11px;
  display: grid; place-items: center;
  border: 1px solid var(--line); background: var(--panel-hi); color: var(--fg-dim);
  transition: all var(--t-fast) var(--ease);
}
.icon-btn:hover { color: var(--primary); border-color: var(--line-hi); }
.icon-btn:active { transform: scale(.96); }
.icon-btn.on { color: var(--primary); border-color: var(--line-hi); background: var(--primary-dim); }
.icon-btn svg { width: 18px; height: 18px; }

/* ---------- 4. 屏幕容器 ---------- */
.screens { position: relative; flex: 1 1 auto; min-height: 0; }
.screen {
  position: absolute; inset: 0;
  display: none; flex-direction: column;
  padding: clamp(10px, 1.6vw, 18px);
  padding-bottom: calc(clamp(10px, 1.6vw, 18px) + env(safe-area-inset-bottom));
  overflow: hidden;
}
.screen.active { display: flex; animation: screenIn var(--t-slow) var(--ease); }
@keyframes screenIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* ---------- 5. 通用面板 ---------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
  min-height: 0;
  display: flex; flex-direction: column;
  transition: border-color var(--t-mid) var(--ease), background var(--t-mid) var(--ease);
}
.panel-head {
  flex: 0 0 auto; display: flex; align-items: center; gap: 8px;
  padding: 11px 14px; border-bottom: 1px solid var(--line);
}
.panel-head h3 { margin: 0; font-size: 13px; font-weight: 600; letter-spacing: .04em; color: var(--fg-dim); }
.panel-head .spacer { flex: 1; }
.panel-body { flex: 1 1 auto; overflow-y: auto; padding: 12px 14px; -webkit-overflow-scrolling: touch; }

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11.5px; padding: 3px 9px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--fg-dim); font-family: var(--mono);
}
.chip.ok { color: var(--gain); border-color: color-mix(in srgb, var(--gain) 40%, transparent); background: color-mix(in srgb, var(--gain) 10%, transparent); }
.chip.bad { color: var(--lose); border-color: color-mix(in srgb, var(--lose) 40%, transparent); background: color-mix(in srgb, var(--lose) 10%, transparent); }
.chip.warn { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); background: color-mix(in srgb, var(--warn) 10%, transparent); }
.chip.live { color: var(--primary); border-color: var(--line-hi); background: var(--primary-dim); }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: var(--tap); padding: 0 18px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--panel-hi); color: var(--fg);
  font-size: 14px; font-weight: 500;
  transition: all var(--t-fast) var(--ease);
}
.btn:hover { border-color: var(--line-hi); color: var(--primary); }
.btn:active { transform: scale(.98); }
.btn:disabled { opacity: .45; pointer-events: none; }
.btn.primary {
  background: linear-gradient(140deg, var(--primary), var(--secondary));
  color: #001018; border-color: transparent; font-weight: 700;
  box-shadow: var(--glow);
}
html[data-theme="light"] .btn.primary { color: #fff; }
.btn.ghost { background: transparent; }
.btn.sm { min-height: 36px; padding: 0 12px; font-size: 12.5px; border-radius: 10px; gap: 6px; }
.btn.wide { width: 100%; }
.btn svg { width: 16px; height: 16px; flex: 0 0 auto; }

/* ---------- 7. 封面 ---------- */
.cover {
  margin: auto; max-width: 880px; width: 100%;
  display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(16px, 4vw, 48px);
  align-items: center;
}
.cover-txt h1 {
  margin: 0 0 6px; font-size: clamp(28px, 4.4vw, 52px); line-height: 1.1; letter-spacing: -.01em;
}
.cover-txt h1 em { font-style: normal; color: var(--primary); }
.cover-kicker {
  font-size: 12px; letter-spacing: .26em; color: var(--fg-mute);
  font-family: var(--mono); margin-bottom: 14px; text-transform: uppercase;
}
.cover-txt p { color: var(--fg-dim); margin: 0 0 22px; max-width: 42ch; font-size: 15px; }
.cover-facts { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 26px; }
.cover-cta { display: flex; gap: 10px; flex-wrap: wrap; }
.cover-art {
  aspect-ratio: 1; border-radius: 50%; position: relative; display: grid; place-items: center;
  border: 1px solid var(--line);
  background: radial-gradient(circle at 50% 45%, var(--primary-dim), transparent 62%);
}
.cover-art::before {
  content: ""; position: absolute; inset: 12%; border-radius: 50%;
  border: 1px dashed color-mix(in srgb, var(--primary) 32%, transparent);
  animation: spin 26s linear infinite;
}
.cover-art svg { width: 62%; height: 62%; overflow: visible; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 8. 装配台 ---------- */
.assembly { display: grid; grid-template-columns: 264px 1fr; gap: 12px; flex: 1; min-height: 0; }
.assembly > * { min-width: 0; min-height: 0; }
.lib { display: grid; gap: 8px; min-width: 0; }
.lib-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 10px; border-radius: 11px; text-align: left;
  border: 1px solid var(--line); background: var(--panel-hi);
  transition: all var(--t-fast) var(--ease);
  min-height: 52px;
}
.lib-item:hover { border-color: var(--line-hi); transform: translateX(2px); }
.lib-item.sel { border-color: var(--primary); background: var(--primary-dim); box-shadow: var(--glow); }
.lib-item.used { opacity: .38; pointer-events: none; }
.lib-ico {
  width: 32px; height: 32px; flex: 0 0 auto; border-radius: 9px;
  display: grid; place-items: center; background: var(--secondary-dim); color: var(--secondary);
}
.lib-ico svg { width: 18px; height: 18px; }
.lib-txt b { display: block; font-size: 12.8px; font-weight: 600; line-height: 1.3; }
.lib-txt span { display: block; font-size: 10.5px; color: var(--fg-mute); font-family: var(--mono); }

.bench {
  position: relative; flex: 1 1 auto; min-height: 320px;
  border-radius: var(--r-m); border: 1px solid var(--line);
  background:
    linear-gradient(color-mix(in srgb, var(--line) 55%, transparent) 1px, transparent 1px) 0 0 / 100% 40px,
    linear-gradient(90deg, color-mix(in srgb, var(--line) 55%, transparent) 1px, transparent 1px) 0 0 / 40px 100%,
    var(--bg-1);
  overflow: hidden;
}
.bench-lines { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.bench-lines path, .bench-lines line { stroke: var(--line); stroke-width: 1.5; fill: none; }
.bench-lines path.flow { stroke: var(--primary); stroke-dasharray: 6 8; animation: flow 1.4s linear infinite; opacity: .8; }
@keyframes flow { to { stroke-dashoffset: -28; } }

.socket {
  position: absolute; transform: translate(-50%, -50%);
  width: 108px; min-height: 74px; padding: 8px 6px;
  border-radius: 12px; border: 1.5px dashed var(--line);
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px;
  background: color-mix(in srgb, var(--panel-solid) 70%, transparent);
  color: var(--fg-mute); font-size: 11px; text-align: center;
  transition: all var(--t-fast) var(--ease);
  cursor: pointer;
}
.socket .sk-label { font-size: 10px; letter-spacing: .06em; color: var(--fg-mute); }
.socket .sk-ico { width: 26px; height: 26px; display: grid; place-items: center; color: var(--fg-mute); }
.socket .sk-ico svg { width: 20px; height: 20px; }
.socket .sk-name { font-weight: 600; color: var(--fg-dim); font-size: 11.5px; line-height: 1.25; }
.socket[data-filled="1"] {
  border-style: solid; border-color: var(--line-hi);
  background: color-mix(in srgb, var(--primary) 8%, var(--panel-solid));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--primary) 18%, transparent), var(--glow);
}
.socket[data-filled="1"] .sk-name { color: var(--fg); }
.socket[data-filled="1"] .sk-ico { color: var(--primary); }
.socket.hover { border-color: var(--primary); background: var(--primary-dim); transform: translate(-50%, -50%) scale(1.04); }
.socket.wrong { border-color: var(--lose); box-shadow: 0 0 0 2px color-mix(in srgb, var(--lose) 30%, transparent); animation: shake .36s; }
@keyframes shake {
  0%, 100% { margin-left: 0; } 25% { margin-left: -6px; } 50% { margin-left: 6px; } 75% { margin-left: -3px; }
}
.socket[data-hint="1"] { border-color: var(--primary); animation: pulse 1.6s infinite; }
@keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 var(--primary-dim); } 50% { box-shadow: 0 0 0 8px transparent; } }

.bench-hint {
  position: absolute; left: 12px; bottom: 8px;
  font-size: 11.5px; color: var(--fg-mute); white-space: nowrap;
  background: color-mix(in srgb, var(--panel-solid) 80%, transparent);
  padding: 5px 12px; border-radius: 999px; border: 1px solid var(--line);
}

.assembly-foot { display: flex; align-items: center; gap: 10px; margin-top: 10px; flex: 0 0 auto; }
.assembly-foot .progress { flex: 1; height: 6px; border-radius: 99px; background: var(--line); overflow: hidden; }
.assembly-foot .progress i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--primary), var(--secondary)); transition: width var(--t-mid) var(--ease); }
.assembly-foot .pct { font-family: var(--mono); font-size: 12px; color: var(--fg-dim); min-width: 38px; text-align: right; }

/* ---------- 9. 实验台 ---------- */
/* 单页实验台：左参数 + 右侧整块舞台（原来的右栏已取消，舞台向右扩充） */
.lab { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 12px; flex: 1; min-height: 0; }

.stage-wrap { position: relative; min-height: 0; flex: 1 1 auto; border-radius: var(--r-m); overflow: hidden; border: 1px solid var(--line); background: var(--bg-1); }

/* 装配台内层需要撑满，否则 absolute 子元素没有高度可参照 */
#sc-assembly .panel-body { display: flex; flex-direction: column; min-height: 0; }

/* 装配台底纹：直线加速器画一条束流线，回旋加速器画一个圆 */
.bench[data-stage="linac"]::before {
  content: ""; position: absolute; left: 8%; right: 8%; top: 50%; height: 1px;
  background: repeating-linear-gradient(90deg, var(--line) 0 10px, transparent 10px 20px);
}
.bench[data-stage="cyclo"]::before {
  content: ""; position: absolute; left: 50%; top: 44%; width: 58%; aspect-ratio: 1;
  transform: translate(-50%, -50%); border-radius: 50%;
  border: 1px dashed color-mix(in srgb, var(--primary) 26%, transparent);
}
#gl { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }
html[data-theme="light"] .stage-wrap { background: radial-gradient(circle at 50% 44%, #ffffff, #e8effa 72%); }
html:not([data-theme="light"]) .stage-wrap { background: radial-gradient(circle at 50% 44%, #0a1222, #05070e 74%); }

.hud {
  position: absolute; left: 12px; top: 12px; right: 12px;
  display: flex; flex-wrap: wrap; gap: 6px; pointer-events: none; z-index: 3;
}
.hud-item {
  pointer-events: auto;
  display: flex; align-items: baseline; gap: 5px;
  padding: 5px 10px; border-radius: 9px;
  background: color-mix(in srgb, var(--panel-solid) 78%, transparent);
  border: 1px solid var(--line); backdrop-filter: blur(10px);
  font-family: var(--mono); font-size: 11px;
}
.hud-item span { color: var(--fg-mute); }
.hud-item b { color: var(--fg); font-weight: 600; font-size: 12px; }
.hud-item b.hot { color: var(--primary); }
.hud-item b.bad { color: var(--lose); }

/* 视角切换：原来在右下角，右栏取消后挪到左上角，给右侧悬浮信息卡让位 */
.view-tools {
  position: absolute; left: 12px; top: 12px; z-index: 3;
  display: flex; flex-direction: row; gap: 6px;
}
.vt-btn {
  width: 38px; height: 38px; border-radius: 10px;
  display: grid; place-items: center;
  background: color-mix(in srgb, var(--panel-solid) 82%, transparent);
  border: 1px solid var(--line); color: var(--fg-dim);
  backdrop-filter: blur(10px);
  transition: all var(--t-fast) var(--ease);
}
.vt-btn:hover, .vt-btn.on { color: var(--primary); border-color: var(--line-hi); }
.vt-btn:active { transform: scale(.94); }
.vt-btn svg { width: 17px; height: 17px; }

.polarity-badge {
  position: absolute; left: 12px; bottom: 12px; z-index: 3;
  display: flex; gap: 6px; align-items: center;
  font-family: var(--mono); font-size: 11px;
}
.pol-pill {
  display: flex; align-items: center; gap: 6px; padding: 5px 10px; border-radius: 999px;
  border: 1px solid var(--line); background: color-mix(in srgb, var(--panel-solid) 80%, transparent);
  backdrop-filter: blur(10px);
}
.pol-pill i { width: 8px; height: 8px; border-radius: 50%; display: block; }
.pol-pill.p i { background: var(--pos); box-shadow: 0 0 10px var(--pos); }
.pol-pill.n i { background: var(--neg); box-shadow: 0 0 10px var(--neg); }

/* 参数 */
.param-group { margin-bottom: 16px; }
.param-group:last-child { margin-bottom: 0; }
.param-title {
  font-size: 11px; letter-spacing: .14em; color: var(--fg-mute);
  font-family: var(--mono); margin-bottom: 8px; display: flex; align-items: center; gap: 6px;
}
.param-title::after { content: ""; flex: 1; height: 1px; background: var(--line); }

.seg { display: grid; grid-auto-flow: column; gap: 4px; background: color-mix(in srgb, var(--panel-solid) 60%, transparent); padding: 3px; border-radius: 11px; border: 1px solid var(--line); }
.seg button {
  min-height: 36px; border-radius: 8px; font-size: 12.5px; color: var(--fg-dim);
  transition: all var(--t-fast) var(--ease); padding: 0 6px;
}
.seg button.on { background: var(--primary-dim); color: var(--primary); box-shadow: inset 0 0 0 1px var(--line-hi); }

.slider-row { margin-bottom: 12px; }
.slider-row .sr-top { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 4px; }
.slider-row .sr-name { font-size: 12.5px; color: var(--fg-dim); }
.slider-row .sr-val { font-family: var(--mono); font-size: 12.5px; color: var(--fg); font-weight: 600; }
.slider-row .sr-val small { color: var(--fg-mute); font-weight: 400; }
input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 26px; background: transparent; display: block;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 5px; border-radius: 99px;
  background: linear-gradient(90deg, var(--primary) var(--fill, 0%), var(--line) var(--fill, 0%));
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 20px; height: 20px; border-radius: 50%;
  background: var(--primary); border: 3px solid var(--panel-solid);
  box-shadow: 0 0 10px color-mix(in srgb, var(--primary) 60%, transparent);
  margin-top: -7.5px; cursor: grab;
}
input[type="range"]:active::-webkit-slider-thumb { cursor: grabbing; transform: scale(1.1); }
input[type="range"]::-moz-range-track { height: 5px; border-radius: 99px; background: var(--line); }
input[type="range"]::-moz-range-thumb { width: 16px; height: 16px; border-radius: 50%; background: var(--primary); border: 3px solid var(--panel-solid); }

.toggle-row { display: flex; align-items: center; justify-content: space-between; min-height: 38px; font-size: 12.5px; color: var(--fg-dim); }
.switch { width: 42px; height: 25px; border-radius: 99px; background: var(--line); position: relative; transition: background var(--t-fast) var(--ease); flex: 0 0 auto; }
.switch::after {
  content: ""; position: absolute; top: 3px; left: 3px; width: 19px; height: 19px; border-radius: 50%;
  background: var(--fg-dim); transition: all var(--t-fast) var(--ease);
}
.switch.on { background: var(--primary-dim); box-shadow: inset 0 0 0 1px var(--line-hi); }
.switch.on::after { left: 20px; background: var(--primary); }

/* 图表 */
.chart-tabs { display: flex; gap: 4px; padding: 8px 10px 0; flex-wrap: wrap; }
.chart-tab {
  padding: 6px 11px; border-radius: 9px 9px 0 0; font-size: 12px; color: var(--fg-mute);
  border: 1px solid transparent; border-bottom: none; min-height: 34px;
  transition: all var(--t-fast) var(--ease);
}
.chart-tab.on { color: var(--primary); background: var(--primary-dim); border-color: var(--line-hi); }
.chart-box { flex: 1 1 auto; min-height: 0; position: relative; padding: 6px 8px 8px; }
.chart-box canvas { width: 100%; height: 100%; display: block; }

/* ---------- 10. 报告 / 总结 ---------- */
.report { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; flex: 1; min-height: 0; }
.report .panel.wide { grid-column: 1 / -1; }
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 8px; }
.stat {
  padding: 10px 12px; border-radius: 11px; border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-solid) 55%, transparent);
}
.stat span { display: block; font-size: 11px; color: var(--fg-mute); margin-bottom: 3px; }
.stat b { font-family: var(--mono); font-size: 17px; color: var(--primary); font-weight: 600; }
.stat b.bad { color: var(--lose); }
.stat small { font-size: 10.5px; color: var(--fg-mute); margin-left: 3px; }

.prose { font-size: 13.5px; color: var(--fg-dim); line-height: 1.75; }
.prose b { color: var(--fg); }
.prose .hl { color: var(--primary); font-weight: 600; }
.prose .bad { color: var(--lose); font-weight: 600; }
.prose ul { margin: 8px 0; padding-left: 18px; }
.prose li { margin-bottom: 6px; }

.callout {
  border-left: 3px solid var(--primary); padding: 10px 14px; border-radius: 0 10px 10px 0;
  background: var(--primary-dim); font-size: 13px; color: var(--fg-dim); line-height: 1.7;
}
.callout.warn { border-color: var(--warn); background: color-mix(in srgb, var(--warn) 10%, transparent); }
.callout.bad { border-color: var(--lose); background: color-mix(in srgb, var(--lose) 9%, transparent); }

/* ---------- 11. 提示条 ---------- */
.toast-host { position: fixed; left: 50%; top: 68px; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 8px; pointer-events: none; width: min(92vw, 460px); }
.toast {
  padding: 11px 15px; border-radius: 12px; font-size: 13px; line-height: 1.5;
  background: var(--panel-solid); border: 1px solid var(--line-hi); box-shadow: var(--shadow);
  animation: toastIn var(--t-mid) var(--ease); display: flex; gap: 9px; align-items: flex-start;
}
.toast.bad { border-color: color-mix(in srgb, var(--lose) 55%, transparent); }
.toast.ok { border-color: color-mix(in srgb, var(--gain) 55%, transparent); }
.toast i { flex: 0 0 auto; width: 17px; height: 17px; margin-top: 1px; }
@keyframes toastIn { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }

/* ---------- 12. 移动端 ---------- */
.mobile-tabs { display: none; }

@media (max-width: 1180px) {
  .lab { grid-template-columns: 210px minmax(0, 1fr); }
  .assembly { grid-template-columns: 210px 1fr; }
}

/* ---------- 12. 手机（只有真手机才走移动端方案） ----------
   不能只用宽度判断：安卓平板默认缩放后 CSS 宽度常在 600~900，
   单看 max-width 会把平板误判成手机。
   现行规则：**只要横屏就走桌面方案**；只有"竖屏且很窄（≤560）"才切成单列。
   另外右上角有个「Pad 适配」按钮，点一下给 <html> 加 .force-desktop，
   下面所有移动端规则都写成 html:not(.force-desktop) xxx —— 加了类就强制走桌面。 */
@media (max-width: 560px) and (orientation: portrait) {
  html:not(.force-desktop) body { font-size: 14px; }
  html:not(.force-desktop) .brand-txt span { display: none; }
  /* 手机上标题直接收起，只留 logo —— 保证右侧按钮不被挤出去 */
  html:not(.force-desktop) .brand-txt { display: none; }
  html:not(.force-desktop) .topbar { gap: 8px; }
  html:not(.force-desktop) .pad-btn { padding: 0 9px; font-size: 11.5px; height: 34px; }
  html:not(.force-desktop) .icon-btn { width: 36px; height: 36px; }

  html:not(.force-desktop) .lab { grid-template-columns: minmax(0, 1fr); grid-template-rows: minmax(220px, 46vh) 1fr; }
  html:not(.force-desktop) .lab > * { min-width: 0; }
  html:not(.force-desktop) .lab > .side-panel { display: flex; grid-row: 2; overflow: hidden; }

  html:not(.force-desktop) .screen { overflow-y: auto; }
}

@media (max-width: 560px) {
  .steps .step span { display: none; }
  .step { padding: 7px 9px; }
  .top-actions .icon-btn { width: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* ==========================================================
   13. 3D 装配台 / 双实验台布局（v2）
   ========================================================== */
.stage-wrap > canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }

.asm-col, .lab-mid { display: flex; flex-direction: column; gap: 8px; min-height: 0; min-width: 0; }
.btn-row { display: flex; gap: 8px; flex: 0 0 auto; }
.btn-row .btn { min-width: 0; }

#sc-assembly .stage-wrap { border: none; border-radius: 0 0 var(--r-m) var(--r-m); }

.asm-tip {
  position: absolute; left: 12px; bottom: 10px; z-index: 3;
  font-size: 11.5px; color: var(--fg-dim); white-space: nowrap;
  background: color-mix(in srgb, var(--panel-solid) 82%, transparent);
  padding: 5px 12px; border-radius: 999px; border: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

/* 器材库：3D 缩略图卡片 */
.lib-item { touch-action: none; user-select: none; -webkit-user-select: none; }
.lib-3d {
  width: 48px; height: 48px; flex: 0 0 auto; border-radius: 10px; overflow: hidden;
  display: grid; place-items: center;
  background: radial-gradient(circle at 50% 40%, rgba(0,229,255,.14), rgba(0,0,0,0) 70%);
  border: 1px solid var(--line);
}
.lib-3d img { width: 100%; height: 100%; object-fit: contain; display: block; }
.lib-item { gap: 9px; padding: 6px 9px; min-height: 62px; }
.lib-item.dragging { opacity: .5; }
.lib-txt b { font-size: 12.5px; }
.lib-txt span { font-size: 10px; }

/* 只读参数行 */
.lock-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 7px 0; font-size: 12.5px; color: var(--fg-dim);
  border-bottom: 1px dashed var(--line);
}
.lock-row b { font-family: var(--mono); color: var(--fg); font-size: 12.5px; }
.lock-row b.hot { color: var(--primary); }

/* 直线加速器实验台：中间列（页面已移除，样式保留给历史版本） */
#sc-linaclab .lab { grid-template-columns: 226px minmax(0,1fr) 336px; }

/* 装配面板必须撑满列高，否则 3D 画布高度为 0 */
.asm-col > .panel { flex: 1 1 auto; min-height: 0; display: flex; flex-direction: column; }
.asm-col > .panel > .panel-body { flex: 1 1 auto; min-height: 0; display: flex; flex-direction: column; }
.asm-col > .panel > .panel-body > .stage-wrap { flex: 1 1 auto; min-height: 220px; }

/* 手机按钮行收紧，三个按钮才放得下 */
@media (max-width: 560px) and (orientation: portrait) {
  html:not(.force-desktop) .btn-row { gap: 5px; }
  html:not(.force-desktop) .btn-row .btn { padding: 0 10px; font-size: 13px; gap: 5px; }
  html:not(.force-desktop) .btn-row .btn svg { width: 14px; height: 14px; }
}

/* hidden 属性优先级高于 .hud-item 的 display:flex */
[hidden] { display: none !important; }

/* 粒子旁的浮层收小：HUD / 视角按钮 / 极性徽章 */
.hud-item { padding: 4px 8px; border-radius: 8px; font-size: 10.5px; }
.hud-item b { font-size: 11.5px; }
.vt-btn { width: 32px; height: 32px; border-radius: 9px; }
.vt-btn svg { width: 15px; height: 15px; }
.view-tools { gap: 5px; }
.pol-pill { padding: 4px 8px; font-size: 10px; }
.pol-pill i { width: 6px; height: 6px; }
.polarity-badge { font-size: 10px; gap: 5px; }

/* 驱动问题标题 */
.task-q { font-size: 13.5px !important; color: var(--fg) !important; letter-spacing: 0 !important; }
.task-q b { color: var(--primary); font-family: var(--mono); }

/* 规模换算小卡片 */
#report-scale .stat b, #sum-scale .stat b { font-size: 15px; }
.task-banner {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px; margin-bottom: 10px; border-radius: 10px;
  background: var(--primary-dim); border: 1px solid var(--line-hi);
  font-size: 13.5px; color: var(--fg-dim); flex: 0 0 auto;
}
.task-banner b { color: var(--primary); font-family: var(--mono); }

/* 装配提示不要被裁掉 */
.asm-tip { white-space: normal; max-width: 70%; line-height: 1.4; }

/* 发现瓶颈页：单栏铺满 + 底部结论 */
.report-single { display: flex; flex-direction: column; gap: 12px; flex: 1; min-height: 0; }
.report-single > .panel { flex: 1 1 auto; min-height: 0; }
.report-single .panel-body { display: flex; flex-direction: column; }
.report-foot { flex: 0 0 auto; display: flex; flex-direction: column; gap: 10px; }
.report-foot .callout { font-size: 13.5px; line-height: 1.8; }
.report-next { margin: 0; font-size: 15px; color: var(--fg); text-align: center; }
.report-next b { color: var(--primary); }
.report-foot .btn { min-height: 48px; font-size: 15px; }

/* 瓶颈页英雄区：能量—长度对比 */
.hero {
  margin-top: 12px; padding: 14px 16px 10px;
  border-radius: var(--r-m); border: 1px solid var(--line-hi);
  background: linear-gradient(180deg, var(--primary-dim), transparent 60%);
  display: flex; flex-direction: column; flex: 1 1 auto; min-height: 0;
}
.hero-kicker {
  font-size: 10.5px; letter-spacing: .22em; color: var(--primary);
  font-family: var(--mono); margin-bottom: 6px;
}
.hero-title {
  margin: 0 0 4px; font-size: clamp(19px, 2.1vw, 27px); line-height: 1.28; font-weight: 700;
  letter-spacing: -.01em;
}
.hero-title em { font-style: normal; color: var(--lose); }
.hero-sub { margin: 0 0 6px; font-size: 12.5px; color: var(--fg-mute); }
.hero .chart-box { padding: 0; }


/* 调参实验：左参数列 + 整块 3D 舞台（右栏取消，舞台向右扩充） */
#sc-lab .lab { grid-template-columns: 240px minmax(0, 1fr); }
#sc-lab .stage-wrap { min-height: 380px; }

/* 「自动寻找共振」按钮：失谐时才出现，展开/收起用弹性曲线 */
.tune-wrap {
  max-height: 0; opacity: 0; overflow: hidden; margin-top: 0;
  transform: translateY(-4px);
  transition: max-height .38s cubic-bezier(.22,1,.36,1),
              opacity .3s ease,
              transform .38s cubic-bezier(.22,1,.36,1),
              margin-top .38s cubic-bezier(.22,1,.36,1);
}
.tune-wrap.show { max-height: 56px; opacity: 1; transform: none; margin-top: 8px; }
.tune-wrap .btn { width: 100%; min-height: 40px; font-size: 13px; gap: 7px; white-space: nowrap; }
.tune-wrap.show .btn { animation: tunePop .42s cubic-bezier(.22,1.4,.4,1) both; }
@keyframes tunePop {
  0%   { transform: scale(.94); }
  60%  { transform: scale(1.015); }
  100% { transform: scale(1); }
}

/* 收起时不占位也不可点 */
.tune-wrap { visibility: hidden; pointer-events: none; transition: max-height .38s cubic-bezier(.22,1,.36,1), opacity .3s ease, transform .38s cubic-bezier(.22,1,.36,1), margin-top .38s cubic-bezier(.22,1,.36,1), visibility 0s linear .4s; }
.tune-wrap.show { visibility: visible; pointer-events: auto; transition: max-height .38s cubic-bezier(.22,1,.36,1), opacity .3s ease, transform .38s cubic-bezier(.22,1,.36,1), margin-top .38s cubic-bezier(.22,1,.36,1), visibility 0s linear 0s; }

/* ==========================================================
   14. 全局过渡与微动效
   ========================================================== */
@keyframes chartIn { from { opacity: .25; transform: scale(.992); } to { opacity: 1; transform: none; } }
@keyframes statIn  { from { opacity: 0; transform: translateY(6px) scale(.985); } to { opacity: 1; transform: none; } }
@keyframes segPop  { 0% { transform: scale(.96); } 55% { transform: scale(1.04); } 100% { transform: scale(1); } }

/* 数据卡片逐个浮起 */
.stat-grid .stat { animation: statIn .42s var(--ease) backwards; }
.stat-grid .stat:nth-child(1) { animation-delay: .01s; }
.stat-grid .stat:nth-child(2) { animation-delay: .05s; }
.stat-grid .stat:nth-child(3) { animation-delay: .09s; }
.stat-grid .stat:nth-child(4) { animation-delay: .13s; }
.stat-grid .stat:nth-child(5) { animation-delay: .17s; }
.stat-grid .stat:nth-child(6) { animation-delay: .21s; }
.stat-grid .stat:nth-child(7) { animation-delay: .25s; }
.stat-grid .stat:nth-child(8) { animation-delay: .29s; }

/* 分段选择器选中时弹一下 */
.seg button.on { animation: segPop .3s cubic-bezier(.22,1.3,.4,1); }

/* 开关拨动更有弹性 */
.switch { transition: background .26s var(--ease), border-color .26s var(--ease); }
.switch::after { transition: transform .32s cubic-bezier(.34,1.56,.64,1), background .22s; }

/* 面板与顶栏在换主题时柔和过渡 */
.panel, .topbar, .stat, .lib-item, .hud-item, .pol-pill {
  transition: background-color .32s ease, border-color .32s ease, color .32s ease;
}

/* 按钮按下反馈 */
.btn:active:not(:disabled), .icon-btn:active, .vt-btn:active, .chart-tab:active, .lib-item:active {
  transform: scale(.97);
}
.btn, .icon-btn, .vt-btn, .chart-tab, .lib-item { transition: transform .16s var(--ease), background .2s, border-color .2s, color .2s; }

/* 难度：进度条与 chip 变化 */
.chip { transition: background .3s ease, color .3s ease, border-color .3s ease; }

/* ==========================================================
   15. 发现瓶颈 · 三屏推导
   ========================================================== */
.deck { display: flex; flex-direction: column; flex: 1 1 auto; min-height: 0; gap: 10px; }
.deck-head { display: flex; align-items: center; gap: 14px; flex: 0 0 auto; }
.deck-kicker {
  font-size: 10.5px; letter-spacing: .22em; color: var(--primary);
  font-family: var(--mono); text-transform: uppercase;
}
.deck-dots { display: flex; gap: 6px; margin-left: auto; }
.deck-dots i {
  display: block; width: 26px; height: 4px; border-radius: 99px;
  background: var(--line); transition: background .3s var(--ease), width .3s var(--ease);
}
.deck-dots i.on { background: var(--primary); width: 34px; }

.deck-body { position: relative; flex: 1 1 auto; min-height: 0; }
.slide {
  position: absolute; inset: 0; display: none;
  grid-template-columns: minmax(0, 1.18fr) minmax(300px, 0.82fr);
  gap: 14px;
}
.slide.active { display: grid; animation: slideIn .4s var(--ease); }
@keyframes slideIn { from { opacity: 0; transform: translateX(14px); } to { opacity: 1; transform: none; } }

.slide-canvas {
  position: relative; min-height: 0; border-radius: var(--r-m);
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 30% 10%, color-mix(in srgb, var(--primary) 8%, transparent), transparent 60%),
    color-mix(in srgb, var(--panel-solid) 70%, transparent);
  overflow: hidden;
}
.slide-canvas canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

.slide-text { min-height: 0; overflow-y: auto; padding-right: 6px; display: flex; flex-direction: column; }
.slide-step {
  font-size: 10.5px; letter-spacing: .18em; color: var(--fg-mute);
  font-family: var(--mono); margin-bottom: 8px;
}
.slide-text h2 {
  margin: 0 0 12px; font-size: clamp(19px, 1.9vw, 25px); line-height: 1.3;
  letter-spacing: -.01em;
}
.slide-text p { margin: 0 0 12px; font-size: 13.5px; line-height: 1.85; color: var(--fg-dim); }
.slide-text p b { color: var(--fg); }
.slide-text p.muted { color: var(--fg-mute); font-size: 12.5px; }

.fx {
  display: flex; flex-wrap: wrap; gap: 8px 14px; margin: 4px 0 14px;
  padding: 12px 14px; border-radius: 11px;
  background: color-mix(in srgb, var(--primary) 9%, transparent);
  border: 1px solid var(--line-hi);
  font-family: var(--mono); font-size: 13.5px; color: var(--fg);
}
.fx i { font-style: italic; color: var(--primary); }

.parts { list-style: none; margin: 0 0 12px; padding: 0; display: flex; flex-direction: column; gap: 9px; }
.parts li {
  display: flex; flex-direction: column; gap: 2px;
  padding: 9px 12px; border-radius: 10px;
  background: color-mix(in srgb, var(--panel-solid) 60%, transparent);
  border: 1px solid var(--line);
}
.parts li b { font-size: 13px; color: var(--primary); }
.parts li span { font-size: 11.5px; color: var(--fg-mute); line-height: 1.6; }

.deck-foot { display: flex; gap: 8px; flex: 0 0 auto; }
.deck-foot .btn { flex: 1; min-height: 44px; }
.deck-foot .btn#deck-prev { flex: 0 0 110px; }
.deck-foot .btn:disabled { opacity: .35; }

@media (max-width: 900px) {
  .slide { grid-template-columns: 1fr; grid-template-rows: minmax(180px, 42%) minmax(0, 1fr); }
  .slide-canvas { min-height: 180px; }
  .deck-foot .btn#deck-prev { flex: 0 0 88px; }
}

/* 三屏改为纯图/纯动画，文字由老师口述 */
.slide { grid-template-columns: 1fr; grid-template-rows: minmax(0, 1fr); }
.slide-canvas { border: none; background: transparent; }
.slide-figure {
  height: 100%; min-height: 0; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--r-m); padding: 8px;
  background: #fff;
  border: 1px solid var(--line);
}
.slide-figure img {
  max-width: 100%; max-height: 100%; width: auto; height: auto;
  object-fit: contain; display: block;
  border-radius: 6px;
}

/* 第三屏：左文字 + 右原图（和 PPT 版式一致） */
.slide.split { grid-template-columns: minmax(260px, 0.85fr) minmax(0, 1.35fr); }
.slide.split .slide-text { justify-content: center; padding-left: 6px; }
.slide.split .parts { counter-reset: p; gap: 12px; }
.slide.split .parts li { position: relative; padding-left: 46px; background: none; border: none; }
.slide.split .parts li::before {
  counter-increment: p;
  content: "(" counter(p) ")";
  position: absolute; left: 6px; top: 50%; transform: translateY(-50%);
  font-family: var(--mono); font-size: 15px; color: var(--primary);
}
.slide.split .parts li b { font-size: 16px; color: var(--fg); }
.slide.split .parts li span { font-size: 12px; }
@media (max-width: 900px) {
  .slide.split { grid-template-columns: 1fr; grid-template-rows: minmax(0, 0.9fr) minmax(0, 1.1fr); }
}

/* 第三屏：图片再收小一点，文字区更宽 */
.slide.split { grid-template-columns: minmax(300px, 1fr) minmax(0, 1.15fr); }
.slide.split .slide-figure { padding: 22px; }
.slide.split .slide-figure img { max-width: 88%; max-height: 88%; }

/* 第三屏：去掉外层白框，图片本身缩到 78% 居中 */
.slide.split .slide-figure {
  background: transparent; border: none; padding: 0;
}
.slide.split .slide-figure img {
  max-width: 86%; max-height: 78%;
  border-radius: 8px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, .35);
}

/* 第三屏：白底卡片贴着图走，图片整体缩小 */
.slide.split .slide-figure {
  background: #fff; border: 1px solid var(--line); border-radius: 12px;
  padding: 14px; width: auto; height: auto; max-width: 86%;
  justify-self: center; align-self: center; overflow: visible;
  box-shadow: 0 10px 28px rgba(0, 0, 0, .28);
}
.slide.split .slide-figure img {
  max-width: 100%; max-height: 52vh; width: auto; height: auto;
  display: block; border-radius: 4px;
}

/* 实验台右侧：粒子实时状态表 */
.state-list { display: flex; flex-direction: column; }
.state-row {
  display: flex; align-items: baseline; justify-content: space-between; gap: 12px;
  padding: 10px 2px; border-bottom: 1px dashed var(--line);
  animation: statIn .35s var(--ease) backwards;
}
.state-row:last-child { border-bottom: none; }
.state-row span { color: var(--fg-mute); font-size: 12.5px; }
.state-row b { font-family: var(--mono); font-size: 13.5px; color: var(--fg); text-align: right; }
.state-row b.hot { color: var(--primary); }

/* ==========================================================
   16. 结论页：三个模块 + 示意图
   ========================================================== */
.sum-wrap {
  flex: 1 1 auto; min-height: 0;
  display: grid; grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.5fr);
  gap: 14px;
}
.sum-figure {
  margin: 0; min-height: 0; padding: 12px;
  display: flex; align-items: center; justify-content: center;
  background: #fff; border: 1px solid var(--line); border-radius: var(--r-m);
}
.sum-figure img { max-width: 100%; max-height: 100%; object-fit: contain; display: block; }

.sum-cards { min-height: 0; overflow-y: auto; display: flex; flex-direction: column; gap: 11px; }
.sum-card {
  padding: 13px 16px; border-radius: var(--r-m);
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel-solid) 62%, transparent);
}
.sum-card h3 {
  margin: 0 0 9px; font-size: 15px; line-height: 1.45; font-weight: 600; letter-spacing: 0;
}
.sum-card h3 b { color: var(--primary); font-family: var(--mono); margin-right: 3px; }
.sum-card h3 em { font-style: normal; font-size: 12.5px; color: var(--gain); }
.sum-card p { margin: 9px 0 0; font-size: 13px; line-height: 1.85; color: var(--fg-dim); }
.sum-card p b { color: var(--fg); }

.fxl {
  display: flex; align-items: center; gap: 9px; flex-wrap: wrap;
  font-size: 16.5px; color: var(--fg);
  font-family: "Times New Roman", "Songti SC", serif;
}
.fxl + .fxl { margin-top: 8px; }
.fxl i { font-style: italic; }
.fxl sub, .fxl sup { font-size: .68em; }
.fxl-arrow { color: var(--fg-mute); font-size: 14px; }
.fxl.hl {
  margin-top: 10px; padding: 9px 12px; border-radius: 9px;
  border: 1px solid var(--lose);
  background: color-mix(in srgb, var(--lose) 8%, transparent);
}

.frac { display: inline-flex; flex-direction: column; align-items: center; vertical-align: middle; line-height: 1.12; }
.frac > b {
  display: block; padding: 0 8px; font-weight: 400; text-align: center;
  border-bottom: 1.4px solid currentColor;
}
.frac > i { display: block; padding: 1px 8px 0; font-style: normal; text-align: center; }

.sum-foot { flex: 0 0 auto; display: flex; gap: 10px; margin-top: 12px; }
.sum-foot .btn { flex: 1; min-height: 44px; }

@media (max-width: 900px) {
  .sum-wrap { grid-template-columns: 1fr; grid-template-rows: minmax(140px, 26%) minmax(0, 1fr); }
  .fxl { font-size: 15px; }
}

/* 结论页示意图：白卡贴着图走，不要一大片空白 */
.sum-figure {
  width: auto; height: auto; max-width: 100%;
  justify-self: center; align-self: center;
  border-radius: 12px; box-shadow: 0 10px 26px rgba(0, 0, 0, .22);
}
.sum-figure img { max-height: 46vh; }
.sum-wrap { grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.6fr); }

/* 三个模块均分整列高度，铺满页面 */
.sum-cards { justify-content: stretch; }
.sum-card { flex: 1 1 0; display: flex; flex-direction: column; justify-content: center; }

/* 结论页：整体字号放大 + 1/2 用横线分式 */
.sum-card h3 { font-size: 17px; line-height: 1.5; }
.sum-card h3 em { font-size: 13.5px; }
.sum-card p { font-size: 14.5px; line-height: 1.9; margin-top: 11px; }
.fxl { font-size: 19px; gap: 10px; }
.fxl + .fxl { margin-top: 10px; }
.fxl sub, .fxl sup { font-size: .62em; }
.fxl-arrow { font-size: 15px; }
.frac > b, .frac > i { padding-left: 9px; padding-right: 9px; }
.frac.sm > b, .frac.sm > i {
  padding: 0 4px; font-size: .8em; line-height: 1.1;
}
.frac.sm { margin: 0 1px; vertical-align: -0.28em; }


/* 受力分解图例（左下角） */
.force-legend {
  position: absolute; left: 12px; bottom: 52px; z-index: 3;
  display: flex; flex-direction: column; gap: 4px;
  padding: 7px 10px; border-radius: 9px;
  background: color-mix(in srgb, var(--panel-solid) 78%, transparent);
  border: 1px solid var(--line);
  font-size: 10.5px; color: var(--fg-dim);
  backdrop-filter: blur(6px);
}
.force-legend span { display: flex; align-items: center; gap: 6px; white-space: nowrap; }
.force-legend i { width: 14px; height: 3px; border-radius: 2px; display: block; }
.force-legend i.fl-b { background: #22c55e; }
.force-legend i.fl-e { background: #f59e0b; }
.force-legend sub { font-size: .75em; }

/* ==========================================================
   17. 舞台右侧悬浮实时信息（B / U / R / Ek / T）
   ========================================================== */
.live-float {
  position: absolute; right: 12px; top: 12px; bottom: 12px;
  z-index: 4; width: 212px;
  display: flex; flex-direction: column; justify-content: center; gap: 8px;
  pointer-events: none;
}

.lf-card {
  pointer-events: auto;
  padding: 9px 11px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--panel-solid) 76%, transparent);
  border: 1px solid var(--line);
  backdrop-filter: blur(14px) saturate(1.15);
  -webkit-backdrop-filter: blur(14px) saturate(1.15);
  box-shadow: 0 8px 20px color-mix(in srgb, #000 15%, transparent);
  animation: lfIn .46s var(--ease) backwards;
  transition: background-color .32s ease, border-color .32s ease;
}
.lf-card:nth-child(1) { animation-delay: .02s; }
.lf-card:nth-child(2) { animation-delay: .06s; }
.lf-card:nth-child(3) { animation-delay: .10s; }
.lf-card:nth-child(4) { animation-delay: .14s; }
.lf-card:nth-child(5) { animation-delay: .18s; }
.lf-card:nth-child(6) { animation-delay: .22s; }
@keyframes lfIn { from { opacity: 0; transform: translateY(9px) scale(.98); } to { opacity: 1; transform: none; } }

.lf-head { display: flex; align-items: center; justify-content: space-between; gap: 6px; }
.lf-name { font-size: 11px; letter-spacing: .06em; color: var(--fg-mute); white-space: nowrap; }
/* 标题较长的卡（带电粒子在磁场中的运动周期）：略缩字号，保证一行放得下 */
.lf-card.wide-name .lf-name { font-size: 10.5px; letter-spacing: 0; }
.lf-sym { font-family: var(--mono); font-style: italic; font-size: 12px; color: var(--fg-dim); }

.lf-val { display: flex; align-items: baseline; gap: 4px; margin-top: 3px; line-height: 1; }
.lf-val b {
  font-family: var(--mono); font-size: 21px; font-weight: 700; color: var(--fg);
  letter-spacing: -.02em; font-variant-numeric: tabular-nums;
}
.lf-val small { font-family: var(--mono); font-size: 11px; color: var(--fg-mute); }

.lf-eq { margin-top: 5px; font-size: 10px; line-height: 1.5; color: var(--fg-mute); }
.lf-eq i { font-style: italic; font-family: var(--mono); }
.lf-eq sup, .lf-eq sub { font-size: .78em; }
.lf-eq sub { vertical-align: sub; }

.lf-card.hot { border-color: color-mix(in srgb, var(--primary) 34%, var(--line)); }
.lf-card.hot .lf-val b { color: var(--primary); }

html[data-theme="light"] .lf-card { box-shadow: 0 8px 22px rgba(24, 40, 78, .12); }

/* 六张卡必须在任何桌面/平板尺寸下完整显示，不允许出现滚动。
   所以按"窗口高度"分三档收缩字号与内边距：舞台高度 ≈ 窗口高度 - 110px，
   最矮的桌面窗口（≈460px）也能放下 6 张卡。手机上另有横条布局，见第 18 节。 */
@media (max-height: 880px) {
  .live-float { gap: 6px; }
  .lf-card { padding: 7px 10px; }
  .lf-name { font-size: 10.5px; }
  .lf-card.wide-name .lf-name { font-size: 10px; }
  .lf-val b { font-size: 18px; }
  .lf-eq { font-size: 9px; margin-top: 4px; }
}

@media (max-height: 720px) {
  .live-float { gap: 5px; }
  .lf-card { padding: 5px 9px; border-radius: 10px; }
  .lf-name { font-size: 9.5px; }
  .lf-card.wide-name .lf-name { font-size: 9.5px; }
  .lf-sym { font-size: 11px; }
  .lf-val { margin-top: 2px; }
  .lf-val b { font-size: 15px; }
  .lf-val small { font-size: 10px; }
  .lf-eq { font-size: 8px; margin-top: 2px; line-height: 1.3; }
}

@media (max-height: 600px) {
  .live-float { gap: 4px; }
  .lf-card { padding: 4px 8px; border-radius: 9px; }
  .lf-name { font-size: 9px; }
  .lf-card.wide-name .lf-name { font-size: 8.5px; }
  .lf-sym { font-size: 10px; }
  .lf-val b { font-size: 13.5px; }
  .lf-eq { font-size: 7.5px; margin-top: 1px; }
}

/* ==========================================================
   18. 小屏适配（必须放在最后：要压过 #sc-lab 的 ID 选择器）
   —— 只有真手机才走这里，平板 / iPad / 电脑（含横屏）不会被命中
   ========================================================== */
@media (max-width: 560px) and (orientation: portrait) {
  html:not(.force-desktop) #sc-lab .lab {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: minmax(220px, 46vh) 1fr;
  }
  html:not(.force-desktop) #sc-lab .lab > .lab-mid { grid-row: 1; }
  html:not(.force-desktop) #sc-lab .lab > .side-panel { grid-row: 2; min-height: 0; }

  /* 六块信息卡：竖排太占地方，改成舞台底部可横滑的一条（手机允许滑动） */
  html:not(.force-desktop) .live-float {
    left: 8px; right: 8px; top: auto; bottom: 8px; width: auto;
    flex-direction: row; justify-content: flex-start; gap: 6px;
    overflow-x: auto; overflow-y: hidden; padding-bottom: 2px;
    pointer-events: auto; -webkit-overflow-scrolling: touch;
  }
  html:not(.force-desktop) .live-float::-webkit-scrollbar { height: 0; }
  html:not(.force-desktop) .lf-card { flex: 0 0 auto; width: 134px; padding: 5px 8px 6px; }
  html:not(.force-desktop) .lf-name { font-size: 9px; }
  html:not(.force-desktop) .lf-card.wide-name .lf-name { font-size: 8.5px; }
  html:not(.force-desktop) .lf-sym { font-size: 10px; }
  html:not(.force-desktop) .lf-val b { font-size: 14px; }
  html:not(.force-desktop) .lf-val small { font-size: 9.5px; }
  html:not(.force-desktop) .lf-eq { font-size: 7.5px; margin-top: 2px; line-height: 1.3; }
  html:not(.force-desktop) .lf-card:nth-child(n) { animation-delay: 0s; }

  html:not(.force-desktop) .polarity-badge { display: none; }
  html:not(.force-desktop) .force-legend { left: 8px; top: 52px; bottom: auto; }
  html:not(.force-desktop) .view-tools { gap: 4px; }
}

/* ==========================================================
   19. 平板 / 窄窗口（非手机）：仍然是桌面方案，只收窄左栏与悬浮卡
   必须放在 .live-float 基础样式之后，否则宽度会被基础值覆盖
   注意：这里只管"横向宽度"，字号仍交给上面按高度分层的那三档，
   否则会盖掉矮屏档的字号，六张卡又放不下。
   ========================================================== */
@media (min-width: 561px) and (max-width: 1040px) and (min-height: 561px) {
  #sc-lab .lab { grid-template-columns: 208px minmax(0, 1fr); }
  .live-float { width: 178px; }
  .lf-card { padding-left: 9px; padding-right: 9px; }
  .lf-card.wide-name .lf-name { font-size: 9.5px; }
}

/* 宽而矮的窗口（例如笔记本拖扁）：仍是桌面方案，把舞台最小高度降下来免得溢出 */
@media (min-width: 1001px) and (max-height: 620px) and (orientation: landscape) {
  #sc-lab .stage-wrap { min-height: 300px; }
}

/* ==========================================================
   17. Pad 适配按钮（被误判成手机时才出现）
   ========================================================== */
.pad-btn {
  height: 36px; padding: 0 14px; border-radius: 10px;
  font-size: 12.5px; font-weight: 600; letter-spacing: .02em;
  color: var(--primary);
  background: color-mix(in srgb, var(--primary) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--primary) 45%, var(--line));
  white-space: nowrap;
  transition: background .2s var(--ease), transform .2s var(--ease);
}
.pad-btn:hover { background: color-mix(in srgb, var(--primary) 20%, transparent); }
.pad-btn:active { transform: scale(.96); }

/* 顶栏防溢出：品牌区可收缩，动作区永不被挤出去 */
.topbar .brand { min-width: 0; flex: 0 1 auto; overflow: hidden; }
.topbar .brand-txt { overflow: hidden; }
.topbar .brand-txt b { overflow: hidden; text-overflow: ellipsis; }
.topbar .top-actions { flex: 0 0 auto; }

/* ==========================================================
   18. 美化 v2（B 方向 · 快赢 2/4/5）
   ========================================================== */

/* 数值：等宽 + 胶囊底；单位降一级 */
.slider-row .sr-top { align-items: center; }
.slider-row .sr-val {
  font-family: var(--mono); font-size: 15px; font-weight: 600;
  font-variant-numeric: tabular-nums; letter-spacing: -.01em;
  padding: 1px 9px; border-radius: 7px;
  background: color-mix(in srgb, var(--primary) 9%, transparent);
  border: 1px solid color-mix(in srgb, var(--primary) 18%, transparent);
}
.slider-row .sr-val small {
  font-size: 10px; color: var(--fg-mute); margin-left: 3px;
  letter-spacing: .02em; font-weight: 500;
}

/* 轨道：填充段青→紫，滑块白芯 */
input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  background: linear-gradient(90deg,
    var(--primary) 0%,
    color-mix(in srgb, var(--secondary) 80%, var(--primary)) var(--fill, 0%),
    var(--line) var(--fill, 0%));
}
input[type="range"]::-webkit-slider-thumb {
  width: 18px; height: 18px; margin-top: -6px;
  background: #fff; border: 3px solid var(--primary);
  box-shadow: 0 1px 6px rgba(0, 0, 0, .32);
}
input[type="range"]:active::-webkit-slider-thumb { transform: scale(1.12); }

/* 按钮层级：次按钮描边，主按钮实心渐变 + 按压反馈 */
.btn {
  background: color-mix(in srgb, var(--panel-hi) 65%, transparent);
  border: 1px solid var(--line);
}
.btn:hover { border-color: color-mix(in srgb, var(--primary) 50%, var(--line)); color: var(--primary); }
.btn:active { transform: scale(.985); }
.btn.primary {
  background: linear-gradient(140deg, var(--primary), var(--secondary));
  border-color: transparent; color: #001018;
  box-shadow: 0 10px 26px -14px color-mix(in srgb, var(--primary) 90%, transparent);
}
.btn.primary:hover { color: #001018; filter: brightness(1.06); }

/* 全屏按钮激活态 */
#btn-full.on {
  color: var(--primary);
  border-color: color-mix(in srgb, var(--primary) 55%, var(--line));
  background: color-mix(in srgb, var(--primary) 12%, transparent);
}

/* ==========================================================
   19. 自绘滑块：轨道与滑块本体都能平滑过渡
   ========================================================== */
.rng { position: relative; height: 26px; display: flex; align-items: center; }
.rng > input[type="range"] {
  position: absolute; inset: 0; width: 100%; height: 100%;
  margin: 0; opacity: 0; z-index: 2; cursor: pointer;
  background: transparent;
}
.rng-track {
  position: relative; width: 100%; height: 6px;
  border-radius: 99px; background: var(--line);
}
.rng-fill {
  position: absolute; left: 0; top: 0; height: 100%; width: 0;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--primary), color-mix(in srgb, var(--secondary) 80%, var(--primary)));
  transition: width .24s var(--ease);
}
.rng-thumb {
  position: absolute; top: 50%; left: 0;
  width: 18px; height: 18px; margin: -9px 0 0 -9px;
  border-radius: 50%; background: #fff;
  border: 3px solid var(--primary);
  box-shadow: 0 1px 6px rgba(0, 0, 0, .32);
  transition: left .24s var(--ease), transform .16s var(--ease);
}
.rng > input[type="range"]:active ~ .rng-track .rng-thumb { transform: scale(1.14); }
.rng-init .rng-fill, .rng-init .rng-thumb { transition: none; }