/* 视觉主线：逻辑分析仪。每周一个通道色，信号线与网格是唯一的装饰。 */
:root {
  --bg: #EDF0F4; --panel: #FFFFFF; --ink: #17202E; --mute: #566375; --line: #D2D9E2; --soft: #E3E8EF;
  --accent: #2646C4; --on-accent: #FFFFFF;
  --ok: #24724A; --bad: #B0362B; --warn: #8E5E00;
  --code-bg: #121A27; --code-ink: #D9E2F0; --code-cap: #1B2636;
  --c1: #2646C4; --c2: #0C7A84; --c3: #4A8419; --c4: #A26B00; --c5: #B4472E; --c6: #7741A6;
  --f-head: Bahnschrift, "DIN Alternate", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  --f-body: "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  --f-mono: "Cascadia Mono", "Cascadia Code", Consolas, "SF Mono", Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0E131B; --panel: #161D28; --ink: #E2E8F1; --mute: #94A1B5; --line: #2A3445; --soft: #1D2633;
    --accent: #90A7FF; --on-accent: #0E131B;
    --ok: #6CCB95; --bad: #F08A7C; --warn: #E3B352;
    --code-bg: #0A0F17; --code-ink: #D9E2F0; --code-cap: #141C29;
    --c1: #90A7FF; --c2: #4EC4CD; --c3: #9CCB6A; --c4: #E0B050; --c5: #F08A6E; --c6: #C596EC;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0E131B; --panel: #161D28; --ink: #E2E8F1; --mute: #94A1B5; --line: #2A3445; --soft: #1D2633;
  --accent: #90A7FF; --on-accent: #0E131B;
  --ok: #6CCB95; --bad: #F08A7C; --warn: #E3B352;
  --code-bg: #0A0F17; --code-ink: #D9E2F0; --code-cap: #141C29;
  --c1: #90A7FF; --c2: #4EC4CD; --c3: #9CCB6A; --c4: #E0B050; --c5: #F08A6E; --c6: #C596EC;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-padding-top: 16px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.75 var(--f-body); -webkit-text-size-adjust: 100%; }
h1, h2, h3, h4 { font-family: var(--f-head); font-weight: 600; line-height: 1.3; margin: 0; text-wrap: balance; }
p { margin: 0 0 12px; }
a { color: var(--accent); text-underline-offset: 3px; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }
[hidden] { display: none !important; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
.skip { position: fixed; left: 12px; top: -60px; background: var(--panel); padding: 8px 14px; z-index: 50; border: 1px solid var(--line); }
.skip:focus { top: 12px; }
.muted { color: var(--mute); font-size: 13.5px; }
.mono, code, pre, kbd { font-family: var(--f-mono); }
.ok { color: var(--ok); } .bad { color: var(--bad); }

/* ---------- 布局 ---------- */
.shell { display: grid; grid-template-columns: 264px minmax(0, 1fr); min-height: 100vh; }
.rail { position: sticky; top: 0; height: 100vh; overflow-y: auto; display: flex; flex-direction: column; gap: 14px;
  padding: 22px 16px 16px; background: var(--panel); border-right: 1px solid var(--line); }
#view { padding: 34px clamp(18px, 4.2vw, 60px) 80px; max-width: 1080px; width: 100%; outline: none; }

.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; color: var(--ink); font: 600 16px/1.25 var(--f-head); }
.brand small { display: block; font: 400 12px/1.4 var(--f-body); color: var(--mute); }
.brand-bg { fill: var(--ink); } .brand-wave { stroke: var(--panel); }
.search input, .filter input { width: 100%; padding: 8px 11px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); font-size: 13.5px; }
.search { display: flex; gap: 4px; margin: 0; }
.search input { min-width: 0; }
.search button { padding: 0 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--panel); font-size: 13px; flex: none; }
#menuBtn { display: none; }
.filter { display: block; max-width: 420px; margin-bottom: 14px; }

#nav { display: grid; gap: 2px; }
#nav a { display: block; padding: 7px 10px; border-radius: 6px; color: var(--ink); text-decoration: none; font-size: 14px; }
#nav a:hover { background: var(--soft); }
#nav a[aria-current] { background: var(--soft); font-weight: 600; }
.nav-group { margin: 12px 10px 4px; font-size: 12px; color: var(--mute); }
#nav a.wk { display: grid; grid-template-columns: 22px 1fr auto; column-gap: 8px; align-items: baseline; position: relative; padding-bottom: 11px; }
.wk-n { font: 600 15px/1 var(--f-head); color: var(--ch); }
.wk-t { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.wk-p { font: 12px var(--f-mono); color: var(--mute); }
#nav a.wk i { position: absolute; left: 40px; right: 10px; bottom: 5px; height: 2px; background: var(--line); }
#nav a.wk i::after { content: ""; position: absolute; inset: 0 auto 0 0; width: var(--p); background: var(--ch); }

.rail-foot { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--line); display: grid; gap: 8px; }
#saveStatus { margin: 0; font-size: 12px; color: var(--mute); line-height: 1.5; }
.foot-row { display: flex; flex-wrap: wrap; gap: 6px; }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 38px; padding: 6px 14px; border-radius: 6px;
  border: 1px solid var(--accent); background: var(--accent); color: var(--on-accent); text-decoration: none; font-size: 14px; }
.btn.ghost, .rail .btn { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover, .rail .btn:hover { border-color: var(--accent); }
.btn.small { min-height: 30px; padding: 3px 10px; font-size: 12.5px; }
.link { background: none; border: 0; padding: 4px 0; text-align: left; font-size: 12.5px; text-decoration: underline; text-underline-offset: 3px; }
.link.danger { color: var(--bad); }

/* ---------- 页头 ---------- */
.page-head { margin-bottom: 22px; }
.page-head h1 { font-size: clamp(25px, 3vw, 34px); letter-spacing: -.01em; }
.lead { font-size: 16px; color: var(--mute); max-width: 44em; margin-top: 10px; }
.crumb { font-size: 13px; color: var(--mute); margin-bottom: 6px; }
.sec { font-size: 20px; margin: 38px 0 14px; }
.home-head h1 { font-size: clamp(28px, 3.6vw, 42px); max-width: 17em; }

/* ---------- 首页 ---------- */
.hero-wave { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 8px 6px 2px; margin-bottom: 22px; overflow-x: auto; }
.hero-wave svg { display: block; width: 100%; min-width: 560px; height: auto; }
.hero-hit { fill: transparent; } .hero-wave a:hover .hero-hit, .hero-wave a:focus-visible .hero-hit { fill: var(--soft); }
.hero-n { font: 600 20px var(--f-head); }
.hero-t { font: 14px var(--f-body); fill: var(--ink); }
.hero-p { font: 13px var(--f-mono); fill: var(--mute); }
.hero-rest { stroke: var(--line); stroke-width: 2; stroke-dasharray: 3 5; fill: none; }
@media (prefers-reduced-motion: no-preference) {
  .hero-wave .w-sig { stroke-dasharray: 2400; stroke-dashoffset: 2400; animation: trace 1.1s ease-out forwards; }
  @keyframes trace { to { stroke-dashoffset: 0; } }
}

.next-up { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: start; padding: 20px 22px; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; }
.next-up h2 { font-size: 15px; color: var(--mute); font-weight: 400; margin-bottom: 4px; }
.next-link { font: 600 19px/1.4 var(--f-head); }
.plan-box { max-width: 300px; font-size: 13.5px; color: var(--mute); }
.plan-box label { display: grid; gap: 4px; margin-bottom: 8px; }
.plan-box input { padding: 6px 9px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); }
.plan-box p { margin: 0; }

.week-list { border-top: 1px solid var(--line); }
.week-row { display: grid; grid-template-columns: 44px 1fr 150px; gap: 16px; align-items: start; padding: 16px 8px; border-bottom: 1px solid var(--line); color: var(--ink); text-decoration: none; }
.week-row:hover { background: var(--panel); }
.wr-n { font: 600 30px/1 var(--f-head); color: var(--ch); }
.wr-main { display: grid; gap: 2px; }
.wr-main strong { font: 600 17px/1.4 var(--f-head); }
.wr-main span { color: var(--mute); font-size: 13.5px; }
.wr-stat { display: grid; gap: 5px; font-size: 12.5px; color: var(--mute); text-align: right; }
.wr-stat b { font: 500 14px var(--f-mono); color: var(--ink); }
.meter { display: block; height: 4px; background: var(--line); border-radius: 2px; overflow: hidden; }
.meter i { display: block; height: 100%; width: var(--p); background: var(--ch, var(--accent)); }
.howto { padding-left: 22px; max-width: 46em; } .howto li { margin-bottom: 8px; }

/* ---------- 周页 ---------- */
.week-head h1 { display: flex; align-items: baseline; gap: 14px; }
.wk-badge { font-size: 1.5em; line-height: 1; color: var(--ch); }
.accept-line { margin-top: 10px; padding-left: 12px; border-left: 3px solid var(--ch); max-width: 46em; }
.accept-line strong { margin-right: 10px; }
.head-meter { display: flex; align-items: center; gap: 14px; margin-top: 14px; font-size: 13px; color: var(--mute); }
.head-meter .meter { width: 180px; }

.tracks { border: 0; padding: 0; margin: 0 0 20px; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.tracks legend { font-size: 13px; color: var(--mute); margin-bottom: 6px; padding: 0; }
.tracks label { display: grid; gap: 2px; padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); cursor: pointer; }
.tracks label.on { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.tracks input { position: absolute; opacity: 0; }
.tracks label:has(:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }
.tracks span { font-size: 13px; color: var(--mute); }

.tabs { display: flex; gap: 2px; overflow-x: auto; overflow-y: hidden; padding-bottom: 1px; border-bottom: 1px solid var(--line); margin-bottom: 20px; }
.tabs a { padding: 9px 14px; white-space: nowrap; color: var(--mute); text-decoration: none; border-bottom: 2px solid transparent; margin-bottom: -1px; font-size: 14.5px; }
.tabs a:hover { color: var(--ink); }
.tabs a[aria-current] { color: var(--ink); border-bottom-color: var(--ch, var(--accent)); font-weight: 600; }
.tabs small { margin-left: 7px; font: 12px var(--f-mono); color: var(--mute); font-weight: 400; }

.days { list-style: none; padding: 0; margin: 0; display: grid; gap: 4px; }
.days > li { padding: 12px 14px; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; }
.days > li.on { opacity: .62; }
.days label { display: flex; gap: 10px; align-items: baseline; cursor: pointer; }
.days ul { margin: 6px 0 0 26px; padding-left: 18px; color: var(--mute); font-size: 14px; }
input[type="checkbox"] { width: 17px; height: 17px; accent-color: var(--accent); flex: none; position: relative; top: 2px; }

.lesson { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; margin-bottom: 8px; }
.lesson > summary { display: grid; grid-template-columns: 28px 1fr auto auto; gap: 10px; align-items: baseline; padding: 14px 18px; cursor: pointer; list-style: none; }
.lesson > summary::-webkit-details-marker { display: none; }
.ls-n { font: 600 17px var(--f-head); color: var(--mute); }
.ls-t { font: 600 17px/1.4 var(--f-head); }
.ls-m, .ls-s { font-size: 12.5px; color: var(--mute); white-space: nowrap; }
.ls-s { color: var(--ok); min-width: 3.2em; text-align: right; }
.lesson[open] > summary { border-bottom: 1px solid var(--line); }
.lesson.on .ls-t { font-weight: 400; }
.lesson > .prose { padding: 20px 22px 6px; }
.lesson-foot { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; padding: 14px 22px 18px; border-top: 1px solid var(--line); margin-top: 10px; }
.check { display: inline-flex; gap: 9px; align-items: baseline; cursor: pointer; }

/* ---------- 正文排版 ---------- */
.prose { max-width: 100%; }
.prose > p, .prose > ul, .prose > ol, .prose > h4, .prose > h3, .prose > .note, .prose > .formula { max-width: 46em; }
.prose h3 { font-size: 19px; margin: 30px 0 10px; }
.prose h4 { font-size: 16.5px; margin: 24px 0 8px; }
.prose ul, .prose ol { padding-left: 22px; margin: 0 0 14px; }
.prose li { margin-bottom: 5px; }
.prose code { font-size: .9em; background: var(--soft); padding: 1px 5px; border-radius: 3px; }
.prose table, table.compact { border-collapse: collapse; width: 100%; margin: 6px 0 16px; font-size: 14px; }
.prose th, .prose td, table.compact th, table.compact td { text-align: left; vertical-align: top; padding: 7px 10px; border-bottom: 1px solid var(--line); }
.prose th, table.compact th { font-weight: 600; color: var(--mute); font-size: 13px; border-bottom-color: var(--mute); }
.scroll { overflow-x: auto; }
.note { border-left: 3px solid var(--c4); padding: 10px 14px; margin: 18px 0; background: var(--soft); font-size: 14px; }
.formula { font: 15px/1.8 var(--f-mono); padding: 9px 14px; margin: 10px 0; background: var(--soft); border-radius: 4px; overflow-x: auto; white-space: nowrap; }
.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 0 28px; }

figure.code { margin: 14px 0 18px; border-radius: 6px; overflow: hidden; background: var(--code-bg); }
figure.code figcaption { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 5px 8px 5px 14px; background: var(--code-cap); color: #9FB0C8; font: 12px var(--f-mono); }
.copy { background: none; border: 1px solid #3A4A61; color: #C5D2E6; border-radius: 4px; padding: 2px 9px; font: 12px var(--f-body); }
.copy:hover { border-color: #8FA6FF; }
figure.code pre { margin: 0; padding: 14px 16px; overflow-x: auto; color: var(--code-ink); font-size: 13px; line-height: 1.6; tab-size: 4; }
figure.code code { background: none; padding: 0; font-size: inherit; }
figure.code i { font-style: normal; }
.k-k { color: #8FB4FF; } .k-c { color: #6F8098; } .k-s { color: #E0B46A; } .k-n { color: #F0A088; } .k-d { color: #D69CF0; } .k-t { color: #6DD3C0; }

.diagram { overflow-x: auto; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 14px; margin-bottom: 16px; }
.diagram svg { display: block; min-width: 720px; width: 100%; height: auto; }
.d-box rect { fill: var(--soft); stroke: var(--ink); stroke-width: 1.3; }
.d-box rect.d-aux { stroke-dasharray: 4 3; }
.d-name { font: 600 14px var(--f-mono); fill: var(--ink); }
.d-sub, .d-label { font: 11.5px var(--f-body); fill: var(--mute); }
.d-line { stroke: var(--c1); stroke-width: 1.6; } .d-dash { stroke-dasharray: 4 3; stroke: var(--c5); }
.d-arrow { fill: var(--c1); }

/* ---------- 勾选清单 ---------- */
.checks { list-style: none; padding: 0; margin: 0; }
.chk { padding: 13px 14px; border-bottom: 1px solid var(--line); }
.chk:first-child { border-top: 1px solid var(--line); }
.chk label { display: flex; gap: 11px; align-items: baseline; cursor: pointer; }
.chk-t { font-weight: 600; }
.chk p { margin: 3px 0 0 28px; color: var(--mute); font-size: 14px; max-width: 46em; }
.chk.on .chk-t { font-weight: 400; color: var(--mute); text-decoration: line-through; text-decoration-color: var(--line); }
.evidence { display: block; margin: 8px 0 0 28px; width: min(100% - 28px, 520px); padding: 6px 10px; border: 1px dashed var(--line); border-radius: 5px; background: transparent; font-size: 13.5px; }
.evidence:focus, .evidence:not(:placeholder-shown) { border-style: solid; background: var(--panel); }

/* ---------- 自测 ---------- */
.quiz-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 6px; }
.quiz { padding-left: 24px; margin: 0; }
.quiz > li { padding: 14px 0 16px; border-bottom: 1px solid var(--line); }
.quiz > li::marker { font: 600 16px var(--f-head); color: var(--mute); }
.q-t { font-weight: 600; margin-bottom: 9px; max-width: 46em; }
.opts { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 6px; max-width: 820px; }
.opt { display: flex; gap: 10px; text-align: left; padding: 8px 12px; background: var(--panel); border: 1px solid var(--line); border-radius: 6px; min-height: 40px; }
.opt b { font: 600 14px var(--f-mono); color: var(--mute); }
.opt:hover:enabled { border-color: var(--accent); }
.opt:disabled { cursor: default; color: var(--mute); }
.opt.right { border-color: var(--ok); color: var(--ink); box-shadow: inset 3px 0 0 var(--ok); }
.opt.wrong { border-color: var(--bad); box-shadow: inset 3px 0 0 var(--bad); }
.why { margin: 10px 0 0; font-size: 14px; max-width: 46em; color: var(--ink); }
.why strong { margin-right: 6px; } .why.ok strong { color: var(--ok); } .why.bad strong { color: var(--bad); }

/* ---------- 追问 ---------- */
.iv { list-style: none; padding: 0; margin: 0; }
.iv-item { display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: start; padding: 12px 0 12px 14px; border-bottom: 1px solid var(--line); border-left: 3px solid transparent; }
.iv-item.r3 { border-left-color: var(--ok); } .iv-item.r2 { border-left-color: var(--warn); } .iv-item.r1 { border-left-color: var(--bad); }
.iv-item summary { cursor: pointer; font-weight: 600; }
.iv-a { margin: 10px 0 2px; padding: 12px 14px; background: var(--panel); border-radius: 6px; max-width: 48em; font-size: 14.5px; white-space: pre-line; }
.iv-sep { padding: 22px 0 6px; font: 600 15px var(--f-head); color: var(--mute); border-bottom: 1px solid var(--mute); }
.rate { display: flex; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.rate button { background: var(--panel); border: 0; border-left: 1px solid var(--line); padding: 5px 11px; font-size: 13px; min-height: 32px; }
.rate button:first-child { border-left: 0; }
.rate button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }

.notes { display: grid; gap: 8px; } .notes span { color: var(--mute); font-size: 13.5px; }
textarea { width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); line-height: 1.7; resize: vertical; }
.empty { padding: 34px 20px; text-align: center; color: var(--mute); border: 1px dashed var(--line); border-radius: 8px; }

/* ---------- 实验台 ---------- */
.tool { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 18px 20px; margin-bottom: 16px; }
.tool h3 { font-size: 17px; margin-bottom: 12px; }
.tool-row { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: end; margin-bottom: 14px; }
.tool-row label { display: grid; gap: 3px; font-size: 12.5px; color: var(--mute); }
.tool-row label.check { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); font-size: 14px; min-height: 36px; }
.tool-row input:not([type="checkbox"]), .tool-row select { padding: 6px 9px; min-height: 36px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--ink); font: 14px var(--f-mono); max-width: 100%; }
.tool-row input[type="number"] { width: 108px; }
.tool-row select { font-family: var(--f-body); }
.tool-out { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 8px; }
.tool-out > span { font-size: 13px; color: var(--mute); min-width: 7em; }
.tool-out code { font: 16px var(--f-mono); background: var(--soft); padding: 4px 10px; border-radius: 4px; }
.hint { font-size: 13.5px; color: var(--mute); margin: 10px 0 0; max-width: 52em; }
.hint:empty { display: none; }
.verdict { padding: 9px 13px; border-left: 3px solid currentColor; background: var(--soft); font-size: 14px; margin: 12px 0; }
.verdict.ok, .verdict.bad { color: var(--ink); } .verdict.ok { border-left-color: var(--ok); } .verdict.bad { border-left-color: var(--bad); }

.readout { display: flex; flex-wrap: wrap; gap: 8px 28px; margin: 12px 0 0; }
.readout > div { min-width: 0; }
.readout dt { font-size: 12.5px; color: var(--mute); }
.readout dd { margin: 0; font: 15px var(--f-mono); }
.readout.wide { margin-top: 16px; } .readout.wide dd { font: 600 24px var(--f-head); }

.wave { overflow-x: auto; padding: 4px 0; }
.wave svg { display: block; }
.w-grid { stroke: var(--line); stroke-width: 1; stroke-dasharray: 2 4; fill: none; }
.w-sig { fill: none; stroke: var(--c1); stroke-width: 2; stroke-linejoin: round; }
.w-bus { fill: var(--soft); stroke: var(--c2); stroke-width: 1.5; stroke-linejoin: round; }
.w-sig.c2, .w-bus.c2 { stroke: var(--c2); } .w-sig.c3, .w-bus.c3 { stroke: var(--c3); } .w-sig.c4, .w-bus.c4 { stroke: var(--c4); }
.w-sig.c5, .w-bus.c5 { stroke: var(--c5); } .w-sig.c6, .w-bus.c6 { stroke: var(--c6); } .w-bus.c1 { stroke: var(--c1); }
.w-idle { stroke: var(--line); stroke-width: 2; fill: none; }
.w-x { fill: var(--line); opacity: .45; }
.w-name { font: 12.5px var(--f-mono); fill: var(--ink); }
.w-val { font: 11.5px var(--f-mono); fill: var(--ink); }
.w-lbl { font: 11.5px var(--f-body); fill: var(--mute); }
.w-dot { fill: var(--panel); stroke: var(--c5); stroke-width: 2; }
.w-mark { stroke: var(--c5); stroke-width: 1.3; stroke-dasharray: 5 3; fill: none; }
.w-marktxt { font: 11.5px var(--f-body); fill: var(--mute); }
.bar-a { fill: var(--c2); } .bar-b { fill: var(--c1); } .bar-c { fill: var(--c3); opacity: .75; } .bar-c.neg { fill: var(--c5); }

.cells { display: grid; grid-template-columns: repeat(8, minmax(52px, 76px)); gap: 4px; overflow-x: auto; padding-bottom: 4px; }
.cell { display: grid; justify-items: center; gap: 2px; padding: 6px 4px 4px; border: 1px solid var(--line); border-radius: 5px; min-height: 86px; align-content: start; }
.cell.used { background: var(--soft); border-color: var(--c2); }
.cell small { font: 11px var(--f-mono); color: var(--mute); }
.cell > span { font: 17px var(--f-mono); }
.tags { display: flex; gap: 3px; min-height: 20px; }
.tag { font: 600 11px var(--f-mono); padding: 1px 6px; border-radius: 3px; color: #fff; }
.tag.w { background: #2646C4; } .tag.r { background: #B4472E; }
.readout b { color: var(--c5); }
.log { margin: 14px 0 0; padding: 0; list-style: none; font: 13px/1.7 var(--f-mono); color: var(--mute); }
.log li:first-child { color: var(--ink); }
table.compact tr.bad td { color: var(--bad); font-weight: 600; }
table.gray { max-width: 360px; } table.gray b { color: var(--c5); }

/* ---------- 速查、术语、搜索 ---------- */
.cheats { columns: 2 340px; column-gap: 18px; }
.cheat { break-inside: avoid; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 16px 18px 6px; margin-bottom: 18px; }
.cheat h3 { margin: 0 0 10px; font-size: 17px; }
.cheat figure.code figcaption { display: none; }
.gloss { margin: 0; border-top: 1px solid var(--line); }
.gloss > div { display: grid; grid-template-columns: 170px 1fr; gap: 16px; padding: 9px 4px; border-bottom: 1px solid var(--line); }
.gloss dt { font-weight: 600; } .gloss dd { margin: 0; color: var(--mute); font-size: 14.5px; }
.results { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.results a { display: grid; gap: 2px; padding: 12px 6px; border-bottom: 1px solid var(--line); text-decoration: none; color: var(--ink); }
.results a:hover { background: var(--panel); }
.r-k { font-size: 12.5px; color: var(--mute); } .r-s { font-size: 13.5px; color: var(--mute); }

#toast { position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 9px 18px; border-radius: 6px; font-size: 14px; z-index: 60; max-width: 90vw; }
#saveStatus.bad { color: var(--bad); }

/* ---------- 面试训练 ---------- */
.interview-promo { border-left: 4px solid var(--accent); background: var(--panel); padding: 18px 20px; display: flex; align-items: center; justify-content: space-between; gap: 18px; margin: 22px 0; }
.interview-promo h2 { font-size: 19px; }
.interview-promo p { color: var(--mute); font-size: 14px; margin: 6px 0 0; }
.interview-promo .btn { flex: none; }
.resume { display: grid; justify-items: start; gap: 6px; margin: 12px 0; }
.resume > span { font-size: 13px; color: var(--mute); }
.home-review, .action-row { display: flex; flex-wrap: wrap; gap: 10px 18px; }
.home-review { font-size: 13px; }
.interview-start { border-bottom: 1px solid var(--line); padding-bottom: 22px; }
.interview-start h2 { font-size: 24px; margin-bottom: 10px; }
.interview-start p { max-width: 48em; }
.interview-start .muted { margin: 14px 0 0; }
.topic-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 26px; }
.topic-list a { display: flex; gap: 12px; justify-content: space-between; padding: 16px 4px; border-bottom: 1px solid var(--line); color: var(--ink); text-decoration: none; }
.topic-list a:hover { background: var(--panel); }
.topic-list a > span:first-child { min-width: 0; }
.topic-list a > span:last-child { flex: none; text-align: right; font-size: 13px; color: var(--accent); }
.topic-list strong { font-family: var(--f-head); font-size: 17px; }
.topic-list small { display: block; color: var(--mute); font-size: 12px; line-height: 1.7; margin-top: 5px; }
.topic-inline { display: inline-block; margin: 3px 12px 3px 0; font-size: 12px; }
.interview-body { min-width: 0; }
.interview-body h2 { font-size: 21px; }
.interview-body h2 small { display: block; font: 400 12px/1.6 var(--f-body); color: var(--mute); margin-top: 6px; }
.question-toolbar { display: flex; justify-content: space-between; align-items: start; gap: 16px; padding-bottom: 8px; }
.question-toolbar p { max-width: 44em; font-size: 14px; color: var(--mute); }
.question-toolbar .btn { flex: none; }
.question-topic { margin: 26px 0 36px; }
.question-topic > h2 { margin-bottom: 10px; }
.interview-question { scroll-margin-top: 20px; grid-template-columns: minmax(0, 1fr) auto; }
.interview-question summary { line-height: 1.7; }
.interview-question details { min-width: 0; }
.interview-answer { max-width: 48em; margin-top: 14px; padding: 16px 18px; background: var(--panel); border-radius: 6px; }
.interview-answer h4 { font-size: 14px; color: var(--accent); margin: 18px 0 6px; }
.interview-answer h4:first-child { margin-top: 0; }
.interview-answer p { font-size: 14px; line-height: 1.9; white-space: pre-line; overflow-wrap: anywhere; }
.interview-answer > a { font-size: 13px; }
.interview-drill { margin: 24px 0 36px; padding-bottom: 24px; border-bottom: 1px solid var(--line); scroll-margin-top: 20px; }
.interview-drill h2 { margin-bottom: 12px; }
.interview-drill h3 { font-size: 15px; margin-top: 18px; }
.interview-drill p, .interview-drill li { max-width: 52em; overflow-wrap: anywhere; }
.interview-drill details { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 12px 16px; margin: 16px 0; min-width: 0; }
.interview-drill summary { cursor: pointer; font-weight: 600; }
.interview-drill .check { display: flex; gap: 8px; align-items: baseline; }
.mock-list { padding-left: 26px; }
.mock-list > li { border-bottom: 1px solid var(--line); padding: 18px 0; }
.mock-list h2 { margin-bottom: 12px; }
.gate-list li { margin-bottom: 8px; }
.source-list { padding-left: 24px; }
.source-list > li { padding: 12px 0; border-bottom: 1px solid var(--line); }
.source-list h2 { font-size: 17px; line-height: 1.65; margin-bottom: 8px; }
.source-list p { font-size: 14px; overflow-wrap: anywhere; }
.tabs a[aria-current] { color: var(--accent); border-bottom-color: var(--accent); }

/* ---------- 窄屏 ---------- */
@media (max-width: 900px) {
  .shell { display: block; }
  .rail { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--line); padding: 14px 16px; gap: 10px; display: grid; grid-template-columns: minmax(0, 1fr) auto; }
  #menuBtn { display: inline-flex; align-self: center; min-height: 38px; }
  .rail .search, #nav, .rail-foot { grid-column: 1 / -1; }
  #nav { display: none; overflow-x: auto; gap: 4px; padding-bottom: 4px; }
  .rail-foot { display: none; }
  .menu-open #nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .menu-open .rail-foot { display: grid; }
  #nav a { white-space: nowrap; flex: none; }
  #nav a.wk { display: flex; gap: 6px; padding-bottom: 7px; } #nav a.wk i, .wk-p, .nav-group { display: none; }
  .wk-t { max-width: 9em; }
  .rail-foot { margin-top: 0; padding-top: 8px; }
  #view { padding: 22px 16px 60px; }
  .next-up { grid-template-columns: 1fr; }
  .tracks { grid-template-columns: 1fr; }
  .week-row { grid-template-columns: 34px 1fr; } .wr-stat { grid-column: 2; text-align: left; max-width: 220px; }
  .lesson > summary { grid-template-columns: 22px 1fr; } .ls-m, .ls-s { grid-column: 2; }
  .lesson > .prose { padding: 16px 14px 4px; } .lesson-foot { padding: 12px 14px 16px; }
  .iv-item { grid-template-columns: 1fr; }
  .gloss > div { grid-template-columns: 1fr; gap: 2px; }
  .interview-promo { align-items: flex-start; flex-direction: column; padding: 16px; }
  .topic-list { grid-template-columns: 1fr; }
  .question-toolbar { flex-direction: column; gap: 4px; }
  .interview-question { grid-template-columns: minmax(0, 1fr); }
  .interview-question .rate { justify-self: start; }
  .interview-answer { padding: 14px; }
  .interview-drill details { padding: 12px; }
  .opts { grid-template-columns: minmax(0, 1fr); }
}
@media print {
  .rail, .tabs, .lesson-foot, .copy, #toast { display: none !important; }
  .shell { display: block; } body { background: #fff; } #view { padding: 0; max-width: none; }
  figure.code { break-inside: avoid; }
}