/* ======================================================================
   JS 事件循环演示器 · 独立设计（循环仪表盘 + 时序轨道主题）
   浅色 = 靛蓝工程纸；深色 = 深紫控制台
   ====================================================================== */
.elv{
  --ink:#1e1b4b; --sub:#5a5680; --faint:#9d99bf;
  --bg:#f3f2fb; --card:#ffffff; --card2:#eceaf8; --line:#dcd8f0; --line2:#e7e4f5;
  --pri:#4f46e5; --pri-2:#818cf8; --pri-soft:#e5e2fb; --pri-ink:#3730a3;
  --micro:#0891b2; --micro-soft:#ddf4f9;
  --macro:#c2410c; --macro-soft:#fdeadd;
  --frame:#be185d; --frame-soft:#fbdcea;
  --sync:#4338ca; --sync-soft:#e3e0fa;
  --red:#b42323; --ok:#0f766e;
  --r:14px;
  --shadow:0 1px 2px rgba(30,27,75,.05),0 10px 28px rgba(30,27,75,.07);
  color:var(--ink);
  font-family:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:15px; line-height:1.75;
  background:
    radial-gradient(820px 400px at 90% -120px, rgba(79,70,229,.10), transparent 60%),
    radial-gradient(640px 340px at -6% 120px, rgba(8,145,178,.07), transparent 60%),
    var(--bg);
  padding:0 16px 56px;
}
:root[data-theme="dark"] .elv{
  --ink:#e6e4f7; --sub:#a5a0c8; --faint:#6f6a96;
  --bg:#131024; --card:#1c1836; --card2:#232045; --line:#353060; --line2:#2b2750;
  --pri:#818cf8; --pri-2:#a5b4fc; --pri-soft:rgba(129,140,248,.14); --pri-ink:#c7d2fe;
  --micro:#22d3ee; --micro-soft:rgba(34,211,238,.12);
  --macro:#fb923c; --macro-soft:rgba(251,146,60,.12);
  --frame:#f472b6; --frame-soft:rgba(244,114,182,.12);
  --sync:#a5b4fc; --sync-soft:rgba(165,180,252,.12);
  --red:#f87171; --ok:#2dd4bf;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 12px 32px rgba(0,0,0,.4);
}
.elv *{box-sizing:border-box;}
.elv b{font-weight:700;}
.elv-wrap{max-width:1120px;margin:0 auto;}
.elv code,.elv pre,.elv textarea{font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Consolas,"Courier New",monospace;}

/* ---------- 首屏 Hero：循环仪表盘 ---------- */
.elv-hero{margin-top:22px;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:var(--shadow);
  background:linear-gradient(120deg,var(--pri-ink),var(--pri) 55%,#7c3aed);color:#fff;
  display:flex;gap:26px;align-items:center;padding:26px 30px;flex-wrap:wrap;}
:root[data-theme="dark"] .elv-hero{background:linear-gradient(120deg,#241f52,#312e81 55%,#4c1d95);}
.elv-dial{width:110px;height:110px;border-radius:50%;position:relative;flex:none;
  background:conic-gradient(from -90deg,#fff 0 25%,rgba(255,255,255,.35) 25% 100%);
  -webkit-mask:radial-gradient(circle,transparent 62%,#000 64%);mask:radial-gradient(circle,transparent 62%,#000 64%);
  animation:elvSpin 3.2s linear infinite;}
@keyframes elvSpin{to{transform:rotate(360deg);}}
.elv-dial-c{position:relative;width:110px;height:110px;flex:none;display:flex;align-items:center;justify-content:center;}
.elv-dial-c span{font-size:12px;font-weight:800;letter-spacing:.06em;opacity:.9;}
.elv-hero h1{margin:0 0 8px;font-size:clamp(23px,3.4vw,31px);font-weight:900;line-height:1.3;}
.elv-hero p{margin:0;color:rgba(255,255,255,.82);font-size:14.5px;max-width:720px;}
.elv-hero p em{font-style:normal;color:#fff;font-weight:700;}

/* ---------- 工作台 ---------- */
.elv-desk{display:grid;grid-template-columns:1.05fr 1fr;gap:18px;margin-top:20px;}
@media (max-width:920px){.elv-desk{grid-template-columns:1fr;}}
.elv-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:18px;}
.elv-card h2{margin:0 0 4px;font-size:16px;font-weight:800;display:flex;align-items:center;gap:8px;}
.elv-card h2 .elv-num{display:inline-flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:7px;background:var(--pri);color:#fff;font-size:12px;font-weight:800;}
:root[data-theme="dark"] .elv-card h2 .elv-num{color:#1c1836;}
.elv-tip{font-size:12.5px;color:var(--sub);margin:0 0 10px;}
.elv-ta{width:100%;min-height:230px;resize:vertical;padding:12px 14px;border-radius:10px;border:1px solid var(--line);
  background:var(--card2);color:var(--ink);font-size:13px;line-height:1.7;outline:none;transition:border-color .15s;}
.elv-ta:focus{border-color:var(--pri-2);box-shadow:0 0 0 3px var(--pri-soft);}
.elv-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:12px;}
.elv-btn{border:none;border-radius:10px;padding:9px 18px;font-size:14px;font-weight:800;cursor:pointer;transition:all .15s;}
.elv-btn-go{background:var(--pri);color:#fff;}
:root[data-theme="dark"] .elv-btn-go{color:#1c1836;}
.elv-btn-go:hover{background:var(--pri-2);}
.elv-btn-ghost{background:var(--card2);color:var(--pri-ink);border:1px solid var(--line);}
.elv-btn-ghost:hover{border-color:var(--pri-2);}
.elv-msg{margin-top:10px;font-size:13px;min-height:20px;font-weight:600;}
.elv-msg.err{color:var(--red);}
.elv-msg.ok{color:var(--ok);}
.elv-speed{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--sub);}
.elv-speed input{width:110px;accent-color:var(--pri);}

/* ---------- 队列面板 ---------- */
.elv-queues{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px;}
.elv-q{border-radius:10px;border:1px solid var(--line);padding:10px 12px;font-size:12.5px;background:var(--card2);}
.elv-q b{display:block;font-size:12px;letter-spacing:.04em;margin-bottom:4px;}
.elv-q.micro{border-color:var(--micro);}.elv-q.micro b{color:var(--micro);}
.elv-q.macro{border-color:var(--macro);}.elv-q.macro b{color:var(--macro);}
.elv-q.frame{border-color:var(--frame);}.elv-q.frame b{color:var(--frame);}
.elv-q code{font-size:11.5px;color:var(--sub);display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}

/* ---------- 时序轨道 ---------- */
.elv-rail{position:relative;padding-left:26px;}
.elv-rail::before{content:"";position:absolute;left:8px;top:6px;bottom:6px;width:2px;background:var(--line);}
.elv-step{position:relative;margin-bottom:10px;border:1px solid var(--line);border-radius:10px;background:var(--card2);
  padding:9px 12px;font-size:13px;opacity:.45;transition:all .25s;}
.elv-step::before{content:"";position:absolute;left:-23px;top:14px;width:12px;height:12px;border-radius:50%;
  background:var(--card);border:3px solid var(--faint);}
.elv-step.cur{opacity:1;box-shadow:0 0 0 2px var(--pri);transform:translateX(3px);}
.elv-step.cur::before{border-color:var(--pri);}
.elv-step.done{opacity:.85;}
.elv-step.done::before{border-color:var(--ok);}
.elv-badge{display:inline-block;border-radius:6px;padding:1px 8px;font-size:11px;font-weight:800;margin-right:8px;vertical-align:1px;}
.elv-badge.sync{background:var(--sync-soft);color:var(--sync);}
.elv-badge.micro{background:var(--micro-soft);color:var(--micro);}
.elv-badge.macro{background:var(--macro-soft);color:var(--macro);}
.elv-badge.frame{background:var(--frame-soft);color:var(--frame);}
.elv-step code{display:block;margin-top:5px;font-size:12px;color:var(--sub);white-space:pre-wrap;word-break:break-all;}
.elv-step .elv-out{margin-top:5px;font-size:12.5px;color:var(--ok);font-weight:700;}
.elv-empty{color:var(--faint);font-size:13.5px;text-align:center;padding:30px 0;}

/* ---------- 输出顺序汇总 ---------- */
.elv-final{margin-top:18px;background:var(--card);border:1px dashed var(--pri);border-radius:var(--r);padding:16px 18px;}
.elv-final h2{margin:0 0 8px;font-size:15px;font-weight:900;color:var(--pri-ink);}
.elv-final ol{margin:0;padding-left:22px;font-size:13.5px;}
.elv-final li{margin:3px 0;}
.elv-final li code{background:var(--pri-soft);border-radius:6px;padding:1px 7px;font-size:12.5px;color:var(--pri-ink);}

/* ---------- FAQ ---------- */
.elv-faq{margin-top:34px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px 24px;box-shadow:var(--shadow);}
.elv-faq h2{margin:0 0 12px;font-size:19px;font-weight:900;}
.elv-faq h3{margin:18px 0 6px;font-size:15.5px;font-weight:800;color:var(--pri-ink);}
.elv-faq p{margin:0;color:var(--sub);font-size:14px;}
.elv-faq p b{color:var(--ink);}

/* ===== 场景预设与分步回放（新增） ===== */
.elv2{margin-top:18px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:18px;}
.elv2 h2{margin:0 0 4px;font-size:16px;font-weight:800;display:flex;align-items:center;gap:8px;}
.elv2-tip{margin:0 0 12px;font-size:12.5px;color:var(--sub);}
.elv2-presets{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;}
@media (max-width:820px){.elv2-presets{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (max-width:480px){.elv2-presets{grid-template-columns:1fr;}}
.elv2-preset{border:1px solid var(--line);background:var(--card2);color:var(--sub);border-radius:9px;padding:8px 10px;font-size:12.5px;font-weight:700;cursor:pointer;text-align:left;line-height:1.4;transition:all .15s;min-width:0;}
.elv2-preset:hover{border-color:var(--pri-2);color:var(--pri-ink);}
.elv2-preset.on{background:var(--pri);border-color:var(--pri);color:#fff;}
:root[data-theme="dark"] .elv2-preset.on{color:#1c1836;}
.elv2-play{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:14px 0 12px;}
.elv2-count{margin-left:auto;font-size:12.5px;font-weight:800;color:var(--pri-ink);background:var(--pri-soft);border:1px solid var(--line);border-radius:8px;padding:4px 10px;white-space:nowrap;}
.elv2-viz{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,.65fr);gap:16px;align-items:start;}
@media (max-width:760px){.elv2-viz{grid-template-columns:1fr;}}
.elv2-viz svg{width:100%;height:auto;background:var(--card2);border:1px solid var(--line);border-radius:12px;display:block;}
.elv2-ring{fill:none;stroke:var(--line);stroke-width:14;}
.elv2-arc{fill:none;stroke-width:14;stroke-linecap:butt;opacity:.2;transition:opacity .2s,stroke-width .2s;}
.elv2-arc.sync{stroke:var(--sync);}
.elv2-arc.micro{stroke:var(--micro);}
.elv2-arc.macro{stroke:var(--macro);}
.elv2-arc.frame{stroke:var(--frame);}
.elv2-arc.on{opacity:1;stroke-width:17;}
.elv2-core-bg{fill:var(--card);stroke:var(--line);}
.elv2-core-text{font-size:15px;font-weight:800;fill:var(--ink);text-anchor:middle;font-family:inherit;}
.elv2-core-sub{font-size:9px;letter-spacing:.14em;fill:var(--faint);text-anchor:middle;font-family:inherit;}
.elv2-lbl{font-size:10.5px;font-weight:800;fill:var(--sub);text-anchor:middle;font-family:inherit;}
.elv2-dot{fill:var(--pri);stroke:var(--card);stroke-width:2;transition:cx .25s,cy .25s;}
.elv2-side{display:flex;flex-direction:column;gap:8px;min-width:0;}
.elv2-meter{display:flex;justify-content:space-between;gap:8px;align-items:center;border:1px solid var(--line);border-radius:9px;background:var(--card2);padding:8px 11px;font-size:12.5px;}
.elv2-meter b{color:var(--sub);font-weight:700;}
.elv2-meter span{font-weight:800;color:var(--ink);}
.elv2-meter.micro span{color:var(--micro);}
.elv2-meter.macro span{color:var(--macro);}
.elv2-meter.frame span{color:var(--frame);}
.elv2-legend{display:flex;flex-wrap:wrap;gap:10px;font-size:11.5px;color:var(--sub);margin-top:2px;}
.elv2-legend i{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:4px;vertical-align:-1px;}
.elv2-legend i.s{background:var(--sync);}
.elv2-legend i.m{background:var(--micro);}
.elv2-legend i.x{background:var(--macro);}
.elv2-legend i.f{background:var(--frame);}
.elv2-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;}
.elv2-msg{margin-top:10px;font-size:13px;min-height:20px;font-weight:600;}
.elv2-msg.err{color:var(--red);}
.elv2-msg.ok{color:var(--ok);}