/* ==========================================================================
   SBTI · 十五维人格量表  —  FORM 15-D
   Design language: 印刷表格 / 答题卡 / 阅卷档案
   Palette: 冷灰再生纸 + 单色墨 + 唯一彩色事件（朱砂印泥，只出现在结果）
   ========================================================================== */

:root {
  /* --- paper: cool recycled stock, NOT warm cream --- */
  --paper:      #E4E5E1;
  --paper-hi:   #F0F0EC;
  --paper-lo:   #D6D8D3;
  --paper-sunk: #CFD1CB;

  /* --- ink --- */
  --ink:    #16181B;
  --ink-2:  #4B4F56;
  --ink-3:  #7C818A;
  --ink-4:  #A2A6AC;

  /* --- rules --- */
  --rule:   #C0C1BA;
  --rule-2: #A6A79F;
  --rule-3: #8A8B83;

  /* --- the only chromatic event in the entire system --- */
  --seal:      #A82D1E;
  --seal-ink:  #8E2416;
  --seal-wash: rgba(168, 45, 30, 0.09);

  --serif: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', 'SimSun', serif;
  --sans:  'Noto Sans SC', system-ui, -apple-system, 'PingFang SC', sans-serif;
  --mono:  'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --gut: clamp(18px, 4.4vw, 56px);
  --maxw: 1180px;

  --ease: cubic-bezier(.22,.61,.36,1);
}

/* --------------------------------------------------------------------------
   reset
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  font-feature-settings: "tnum" 1;
  -webkit-font-smoothing: antialiased;
  min-height: 100dvh;
  overflow-x: hidden;
}
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
h1, h2, h3, p, ul, ol, figure { margin: 0; }
ul, ol { list-style: none; padding: 0; }
:focus-visible { outline: 2px solid var(--seal); outline-offset: 3px; border-radius: 1px; }

/* paper grain — extremely low contrast print texture */
.paper-grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(22,24,27,.028) 0 1px, transparent 1px 3px),
    repeating-linear-gradient(90deg, rgba(22,24,27,.018) 0 1px, transparent 1px 4px);
  mix-blend-mode: multiply;
}

/* --------------------------------------------------------------------------
   shell / form rim
   -------------------------------------------------------------------------- */
.sheet-wrap {
  position: relative; z-index: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  background: var(--paper-hi);
  min-height: 100dvh;
  box-shadow:
    0 0 0 1px var(--rule),
    0 1px 0 rgba(255,255,255,.7) inset,
    0 40px 90px -50px rgba(22,24,27,.45);
}

.rim {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 11px var(--gut);
  border-bottom: 1.5px solid var(--ink);
  font-family: var(--mono);
  font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--ink-2);
}
.rim--foot {
  border-bottom: 0; border-top: 1px solid var(--rule);
  color: var(--ink-3); letter-spacing: .12em;
  font-size: 10px; padding-block: 14px; flex-wrap: wrap;
}
.rim b { font-weight: 500; color: var(--ink); }
.rim .dot { color: var(--rule-3); }

/* --------------------------------------------------------------------------
   shared type utilities
   -------------------------------------------------------------------------- */
.mono { font-family: var(--mono); }
.eyebrow {
  font-family: var(--mono);
  font-size: 10.5px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--ink-3);
}
.rule-h { height: 1px; background: var(--rule); border: 0; }

.screen { display: none; }
.screen.is-on { display: block; }

/* ==========================================================================
   COVER
   ========================================================================== */
.cover {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  min-height: calc(100dvh - 46px);
}
@media (max-width: 900px) { .cover { grid-template-columns: 1fr; min-height: 0; } }

.cover__main { padding: clamp(34px, 6vw, 78px) var(--gut) clamp(30px, 5vw, 64px); border-right: 1px solid var(--rule); }
@media (max-width: 900px) { .cover__main { border-right: 0; border-bottom: 1px solid var(--rule); } }

.cover__title {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(62px, 13vw, 148px);
  line-height: .84;
  letter-spacing: -.02em;
  margin: .28em 0 0;
  color: var(--ink);
}
.cover__title span { display: block; }
.cover__sub {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(17px, 2.5vw, 25px);
  letter-spacing: .34em;
  color: var(--ink-2);
  margin-top: 22px;
  padding-left: 3px;
}
.cover__stamp-line {
  display: flex; align-items: center; gap: 14px; margin-top: clamp(30px, 5vw, 52px);
}
.cover__stamp-line .ln { flex: 1; height: 1px; background: var(--rule-2); }
.cover__stamp-line .no { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; color: var(--ink-3); }

.cover__about {
  margin-top: 30px; max-width: 46ch;
  font-size: 15px; line-height: 1.85; color: var(--ink-2);
}
.cover__about p + p { margin-top: 13px; }
.cover__about strong { color: var(--ink); font-weight: 600; }

.cover__cta { margin-top: clamp(32px, 5vw, 52px); display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }

.big-btn {
  position: relative;
  display: inline-flex; align-items: center; gap: 14px;
  padding: 17px 30px 17px 26px;
  background: var(--ink); color: var(--paper-hi);
  font-family: var(--sans); font-weight: 600; font-size: 16px; letter-spacing: .06em;
  transition: transform .16s var(--ease), background .16s var(--ease);
}
.big-btn::after {
  content: ""; position: absolute; inset: 3px; border: 1px solid rgba(240,240,236,.28); pointer-events: none;
}
.big-btn:hover { background: #000; transform: translateY(-1px); }
.big-btn:active { transform: translateY(0); }
.big-btn .arw { font-family: var(--mono); font-size: 13px; opacity: .75; }
.big-btn--ghost {
  background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1px var(--ink);
}
.big-btn--ghost::after { border-color: rgba(22,24,27,.22); }
.big-btn--ghost:hover { background: rgba(22,24,27,.055); }

/* --- side panel: the answer sheet preview --- */
.cover__side {
  padding: clamp(28px, 4vw, 46px) var(--gut);
  display: flex; flex-direction: column; gap: 24px;
  background: var(--paper);
}
.cover__side .blk { border-top: 1px solid var(--rule); padding-top: 14px; }
.cover__side .blk:first-child { border-top: 0; padding-top: 0; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 16px; font-size: 13.5px; margin-top: 10px; }
.kv dt { font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; color: var(--ink-3); padding-top: 3px; text-transform: uppercase; }
.kv dd { margin: 0; color: var(--ink); }
.kv dd small { color: var(--ink-3); }

.omr-preview { display: flex; flex-wrap: wrap; gap: 6px 9px; margin-top: 12px; }
.omr-preview i {
  width: 15px; height: 15px; border: 1px solid var(--rule-2); border-radius: 50%;
  display: inline-block;
}

.notebox {
  border: 1px solid var(--rule); background: var(--paper-hi);
  padding: 13px 15px; font-size: 12.5px; line-height: 1.75; color: var(--ink-2);
}
.notebox b { color: var(--ink); font-weight: 600; }

/* ==========================================================================
   TEST
   ========================================================================== */
.test-grid {
  display: grid;
  grid-template-columns: 1fr 268px;
  min-height: calc(100dvh - 46px);
  align-items: start;
}
@media (max-width: 1023px) { .test-grid { grid-template-columns: 1fr; } }

.qzone {
  padding: clamp(26px, 4.4vw, 56px) var(--gut) clamp(96px, 13vw, 130px);
  min-height: calc(100dvh - 46px);
  display: flex; flex-direction: column;
}

.qhead {
  display: flex; align-items: baseline; justify-content: space-between; gap: 18px;
  padding-bottom: 12px; border-bottom: 1px solid var(--rule-2);
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .15em;
  text-transform: uppercase; color: var(--ink-3);
}
.qhead .idx { color: var(--seal); letter-spacing: .08em; }

.qbody { flex: 1; display: flex; flex-direction: column; justify-content: center; padding: clamp(20px, 3.4vw, 40px) 0 clamp(16px, 2.4vw, 28px); }

.qnum {
  font-family: var(--mono); font-size: clamp(38px, 7vw, 68px); font-weight: 500;
  line-height: 1; color: var(--paper-sunk); letter-spacing: -.03em;
  margin-bottom: 6px; user-select: none;
}
.qtext {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(20px, 2.9vw, 31px);
  line-height: 1.62;
  letter-spacing: .005em;
  color: var(--ink);
  max-width: 30ch;
  white-space: pre-line;
  text-wrap: pretty;
}
.qtext .quote {
  display: block; padding-left: 15px; border-left: 2px solid var(--rule-2);
  color: var(--ink-2); font-size: .84em; line-height: 1.7; margin-block: .5em;
}

.opts { margin-top: clamp(28px, 4vw, 46px); display: flex; flex-direction: column; max-width: 620px; }
.opt {
  position: relative;
  display: grid; grid-template-columns: 26px 22px 1fr auto; align-items: center;
  gap: 13px; padding: 15px 4px;
  border-bottom: 1px solid var(--rule);
  text-align: left; cursor: pointer;
  transition: background .13s var(--ease), padding-left .2s var(--ease);
}
.opt:first-child { border-top: 1px solid var(--rule); }
.opt:hover { background: rgba(22,24,27,.042); padding-left: 10px; }
.opt.is-picked { background: var(--seal-wash); padding-left: 10px; }
.opt__bub {
  width: 17px; height: 17px; border: 1.4px solid var(--rule-3); border-radius: 50%;
  position: relative; flex: none; transition: border-color .13s var(--ease);
}
.opt__bub::after {
  content: ""; position: absolute; inset: 3px; border-radius: 50%;
  background: var(--seal); transform: scale(0); transition: transform .16s var(--ease);
}
.opt.is-picked .opt__bub { border-color: var(--seal); }
.opt.is-picked .opt__bub::after { transform: scale(1); }
.opt__key {
  font-family: var(--mono); font-size: 11px; letter-spacing: .1em; color: var(--ink-3);
}
.opt__txt { font-size: 15.5px; line-height: 1.55; color: var(--ink); }
.opt.is-picked .opt__txt { font-weight: 500; }
.opt__tick { font-family: var(--mono); font-size: 10px; letter-spacing: .14em; color: var(--seal); opacity: 0; }
.opt.is-picked .opt__tick { opacity: 1; }

.qfoot {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  padding-top: 18px; border-top: 1px solid var(--rule);
}
.ghost-btn {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: .15em; text-transform: uppercase;
  color: var(--ink-2); padding: 9px 0; transition: color .14s var(--ease);
}
.ghost-btn:hover { color: var(--ink); }
.ghost-btn[disabled] { color: var(--ink-4); cursor: default; }
.qfoot .spacer { flex: 1; }
.qfoot .hint { font-family: var(--mono); font-size: 10.5px; letter-spacing: .1em; color: var(--ink-4); }

/* --- keyboard legend --- */
.kbd-leg { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.kbd-leg span { font-family: var(--mono); font-size: 10px; letter-spacing: .1em; color: var(--ink-4); }
kbd {
  font-family: var(--mono); font-size: 10px; padding: 2px 5px;
  border: 1px solid var(--rule-2); border-bottom-width: 2px; border-radius: 3px;
  color: var(--ink-3); background: var(--paper-hi);
}

/* --- answer sheet rail --- */
.rail {
  border-left: 1px solid var(--rule);
  background: var(--paper);
  padding: 22px var(--gut) 26px;
  position: sticky; top: 0;
  align-self: start;
  min-height: calc(100dvh - 46px);
}
@media (max-width: 1023px) {
  .rail {
    position: static; min-height: 0; border-left: 0;
    border-bottom: 1px solid var(--rule);
    padding: 14px var(--gut) 16px;
    display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
  }
  .rail__list { display: none !important; }
  .rail__title { margin-bottom: 0; }
}
.rail__title {
  font-family: var(--mono); font-size: 10px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--ink-3); padding-bottom: 10px; margin-bottom: 14px; border-bottom: 1px solid var(--rule);
}
@media (max-width: 1023px) { .rail__title { border-bottom: 0; padding-bottom: 0; margin: 0; } }

.rail__list { display: flex; flex-direction: column; }
.rail__row {
  display: grid; grid-template-columns: 30px 1fr auto; align-items: center; gap: 10px;
  padding: 6.5px 0; border-bottom: 1px dotted var(--rule);
  cursor: pointer; text-align: left; width: 100%;
  transition: background .13s var(--ease);
}
.rail__row:last-child { border-bottom: 0; }
.rail__row:hover { background: rgba(22,24,27,.045); }
.rail__row[disabled] { cursor: default; }
.rail__row[disabled]:hover { background: none; }
.rail__rom {
  font-family: var(--mono); font-size: 10px; letter-spacing: .06em; color: var(--ink-3);
  text-align: right; font-variant-numeric: tabular-nums;
}
.rail__bubs { display: flex; gap: 7px; }
.rail__bubs i {
  width: 13px; height: 13px; border: 1.2px solid var(--rule-2); border-radius: 50%;
  display: block; position: relative; transition: border-color .16s var(--ease);
}
.rail__bubs i.on { border-color: var(--ink); }
.rail__bubs i.on::after {
  content: ""; position: absolute; inset: 2.5px; border-radius: 50%; background: var(--ink);
  animation: fill .22s var(--ease) both;
}
@keyframes fill { from { transform: scale(.2); opacity: .2; } to { transform: scale(1); opacity: 1; } }
.rail__code { font-family: var(--mono); font-size: 9.5px; letter-spacing: .1em; color: var(--ink-4); }
.rail__row.is-current { background: rgba(22,24,27,.055); box-shadow: inset 2px 0 0 var(--seal); }
.rail__row.is-current .rail__rom { color: var(--seal); font-weight: 700; }
.rail__sp { border-top: 1px solid var(--rule-2); margin-top: 7px; padding-top: 7px; }

.rail__meter { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--rule-2); }
@media (max-width: 1023px) { .rail__meter { margin: 0; padding: 0; border: 0; flex: 1; min-width: 190px; } }
.rail__meter .n { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; color: var(--ink-2); }
.rail__meter .bar { margin-top: 8px; height: 3px; background: var(--paper-sunk); position: relative; }
.rail__meter .bar i { position: absolute; inset: 0 auto 0 0; background: var(--ink); width: 0; transition: width .3s var(--ease); }

/* ==========================================================================
   RESULT
   ========================================================================== */
.result { padding: clamp(26px, 4vw, 52px) var(--gut) 80px; }

.verdict {
  position: relative;
  display: grid; grid-template-columns: 1fr auto; gap: 34px; align-items: center;
  border: 1.5px solid var(--ink);
  background: var(--paper-hi);
  padding: clamp(26px, 4vw, 48px);
  margin-bottom: clamp(34px, 5vw, 56px);
  animation: rise .5s var(--ease) both;
}
@media (max-width: 780px) { .verdict { grid-template-columns: 1fr; gap: 26px; } }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.verdict::before {
  content: ""; position: absolute; inset: 5px; border: 1px solid var(--rule-2); pointer-events: none;
}
.verdict__kick {
  font-family: var(--mono); font-size: 10px; letter-spacing: .22em; text-transform: uppercase;
  color: var(--seal); margin-bottom: 14px;
}
.verdict__cn {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(46px, 9vw, 96px); line-height: .92; letter-spacing: .02em;
  margin: 0; text-wrap: balance;
}
.verdict__en {
  font-family: var(--mono); font-weight: 500;
  font-size: clamp(15px, 2.4vw, 22px); letter-spacing: .46em; text-indent: .46em;
  color: var(--ink-3); margin-top: 14px;
}
.verdict__tag {
  font-family: var(--serif); font-size: clamp(16px, 2.1vw, 21px); line-height: 1.6;
  color: var(--ink-2); margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--rule);
  max-width: 30ch;
}
.verdict__meta {
  font-family: var(--mono); font-size: 11px; letter-spacing: .1em; color: var(--ink-3);
  margin-top: 18px; display: flex; gap: 8px 14px; flex-wrap: wrap;
}
.verdict__meta b { color: var(--ink); font-weight: 500; }

/* --- the seal --- */
.seal {
  width: clamp(104px, 15vw, 148px); height: clamp(104px, 15vw, 148px);
  border: 3px solid var(--seal); border-radius: 3px;
  display: grid; place-items: center; text-align: center;
  color: var(--seal); position: relative;
  transform: rotate(-7deg);
  animation: stamp .5s cubic-bezier(.3,1.5,.5,1) .22s both;
  flex: none;
}
@keyframes stamp {
  0%   { opacity: 0; transform: rotate(-16deg) scale(1.7); }
  60%  { opacity: .92; }
  100% { opacity: 1; transform: rotate(-7deg) scale(1); }
}
.seal::before { content: ""; position: absolute; inset: 5px; border: 1px solid var(--seal); opacity: .62; }
.seal::after {
  content: ""; position: absolute; inset: 0;
  background: var(--seal); opacity: .07;
  -webkit-mask-image: radial-gradient(circle at 34% 28%, transparent 42%, #000 43%);
  mask-image: radial-gradient(circle at 34% 28%, transparent 42%, #000 43%);
  mix-blend-mode: multiply;
}
.seal__t { font-family: var(--serif); font-weight: 700; font-size: clamp(19px, 3.1vw, 27px); letter-spacing: .1em; line-height: 1.15; }
.seal__s { font-family: var(--mono); font-size: 8.5px; letter-spacing: .2em; margin-top: 7px; opacity: .82; }
.seal--hidden { border-color: var(--ink); color: var(--ink); animation-delay: .55s; }
.seal--hidden::before { border-color: var(--ink); }
.seal--hidden::after { background: var(--ink); opacity: .05; }

/* --- generic result block --- */
.blk { margin-bottom: clamp(34px, 4.6vw, 54px); }
.blk__h {
  display: flex; align-items: baseline; gap: 14px;
  padding-bottom: 11px; border-bottom: 1.5px solid var(--ink);
  margin-bottom: 20px;
}
.blk__h h2 {
  font-family: var(--mono); font-size: 11px; font-weight: 500;
  letter-spacing: .22em; text-transform: uppercase; color: var(--ink);
}
.blk__h .n { font-family: var(--mono); font-size: 10px; letter-spacing: .1em; color: var(--ink-4); margin-left: auto; }

.prose { font-family: var(--serif); font-size: 16.5px; line-height: 1.9; color: var(--ink-2); max-width: 62ch; text-wrap: pretty; }
.prose + .prose { margin-top: 14px; }
.prose strong { color: var(--ink); font-weight: 600; }

/* --- dimension readout: your level vs the type's ideal --- */
.dims { border-top: 1px solid var(--rule); }
.dim {
  display: grid;
  grid-template-columns: 62px 30px 1fr;
  gap: 16px; align-items: start;
  padding: 15px 0; border-bottom: 1px solid var(--rule);
}
@media (max-width: 720px) {
  .dim { grid-template-columns: 52px 26px 1fr; gap: 11px; }
}
.dim__note { max-width: 74ch; }
.dim__code { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; color: var(--ink-3); padding-top: 4px; }
.dim__name { font-family: var(--serif); font-weight: 600; font-size: 17px; line-height: 1.3; }
.dim__track { display: flex; align-items: center; gap: 10px; margin-top: 9px; }
.track { position: relative; flex: 1; height: 9px; display: flex; gap: 3px; max-width: 240px; }
.track i { flex: 1; background: var(--paper-sunk); position: relative; }
.track i.on { background: var(--ink); }
.track .mark {
  position: absolute; top: -5px; width: 2px; height: 19px; background: var(--rule-3);
}
.track .mark--diff { background: var(--seal); }
.lvl {
  font-family: var(--mono); font-size: 13px; font-weight: 600; letter-spacing: .1em;
  width: 1.3em; text-align: center;
}
.dim__note { font-size: 13.5px; line-height: 1.72; color: var(--ink-2); }

/* --- matched / secondary types --- */
.nears { display: grid; grid-template-columns: repeat(auto-fill, minmax(178px, 1fr)); gap: 12px; }
.near {
  border: 1px solid var(--rule); background: var(--paper-hi); padding: 15px 16px;
  transition: border-color .15s var(--ease), transform .15s var(--ease);
}
.near:hover { border-color: var(--ink-3); transform: translateY(-2px); }
.near__cn { font-family: var(--serif); font-weight: 600; font-size: 21px; }
.near__en { font-family: var(--mono); font-size: 9.5px; letter-spacing: .2em; color: var(--ink-3); margin-top: 3px; }
.near__pct { font-family: var(--mono); font-size: 11px; color: var(--ink-2); margin-top: 12px; letter-spacing: .06em; }
.near__bar { height: 2px; background: var(--paper-sunk); margin-top: 7px; position: relative; }
.near__bar i { position: absolute; inset: 0 auto 0 0; background: var(--ink-3); }
.near--top { border-color: var(--ink); }
.near--top .near__bar i { background: var(--seal); }

/* --- three-line profile --- */
.trio { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border: 1px solid var(--rule); }
@media (max-width: 820px) { .trio { grid-template-columns: 1fr; } }
.trio > div { padding: 20px 22px; border-right: 1px solid var(--rule); }
.trio > div:last-child { border-right: 0; }
@media (max-width: 820px) { .trio > div { border-right: 0; border-bottom: 1px solid var(--rule); } .trio > div:last-child { border-bottom: 0; } }
.trio h3 { font-family: var(--mono); font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 11px; }
.trio p { font-family: var(--serif); font-size: 15.5px; line-height: 1.8; color: var(--ink-2); }

/* --- no-type fallback --- */
.sparse { border: 1px solid var(--seal); background: var(--seal-wash); padding: 22px 24px; }
.sparse h3 { font-family: var(--serif); font-size: 21px; margin-bottom: 9px; }
.sparse p { font-size: 14px; line-height: 1.8; color: var(--ink-2); max-width: 60ch; }

/* --- actions --- */
.acts { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; padding-top: 6px; }
.share-out {
  font-family: var(--mono); font-size: 11px; letter-spacing: .06em; color: var(--ink-2);
  border: 1px solid var(--rule); background: var(--paper); padding: 11px 14px;
  flex: 1; min-width: 240px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.toast {
  position: fixed; left: 50%; bottom: 34px; transform: translate(-50%, 16px);
  background: var(--ink); color: var(--paper-hi);
  font-family: var(--mono); font-size: 11px; letter-spacing: .12em;
  padding: 12px 20px; opacity: 0; pointer-events: none; z-index: 40;
  transition: opacity .2s var(--ease), transform .2s var(--ease);
}
.toast.on { opacity: 1; transform: translate(-50%, 0); }

/* --------------------------------------------------------------------------
   utility / motion
   -------------------------------------------------------------------------- */
.fade-in { animation: fade .3s var(--ease) both; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.sr {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-delay: 0ms !important; transition-duration: .001ms !important; }
}

@media print {
  .paper-grain, .acts, .toast { display: none !important; }
  body { background: #fff; }
  .sheet-wrap { box-shadow: none; }
}

/* ==========================================================================
   字体 — 本地子集，无外部请求
   宋体承担「试卷」的角色（中文考卷本来就是宋体），黑体承担界面，
   等宽承担编号与读数。三个角色，互不串用。
   ========================================================================== */
@font-face { font-family:'Noto Serif SC'; font-style:normal; font-weight:500; font-display:block;
  src:url('fonts/serif-500.woff2?v=09da78a777') format('woff2'); }
@font-face { font-family:'Noto Serif SC'; font-style:normal; font-weight:700; font-display:block;
  src:url('fonts/serif-700.woff2?v=583b28057c') format('woff2'); }
@font-face { font-family:'Noto Sans SC'; font-style:normal; font-weight:400; font-display:swap;
  src:url('fonts/sans-400.woff2?v=acc7c52768') format('woff2'); }
@font-face { font-family:'Noto Sans SC'; font-style:normal; font-weight:600; font-display:swap;
  src:url('fonts/sans-600.woff2?v=78416a7f71') format('woff2'); }
@font-face { font-family:'JetBrains Mono'; font-style:normal; font-weight:400; font-display:swap;
  src:url('fonts/mono-400.woff2?v=700ba751b6') format('woff2'); }
@font-face { font-family:'JetBrains Mono'; font-style:normal; font-weight:700; font-display:swap;
  src:url('fonts/mono-700.woff2?v=7405123d4d') format('woff2'); }

/* ==========================================================================
   方法论折叠块
   ========================================================================== */
.method { border: 1px solid var(--rule); background: var(--paper); }
.method > summary {
  cursor: pointer; list-style: none; padding: 15px 18px;
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--ink-2); display: flex; align-items: center; gap: 10px;
  transition: color .14s var(--ease);
}
.method > summary::-webkit-details-marker { display: none; }
.method > summary::before {
  content: "+"; font-size: 14px; line-height: 1; color: var(--seal); width: 12px;
  transition: transform .18s var(--ease);
}
.method[open] > summary::before { content: "−"; }
.method > summary:hover { color: var(--ink); }
.method__body { padding: 0 18px 20px; border-top: 1px solid var(--rule); }
.method__steps { counter-reset: m; margin: 16px 0 0; }
.method__steps li {
  counter-increment: m; position: relative; padding-left: 30px;
  font-size: 14px; line-height: 1.8; color: var(--ink-2); margin-bottom: 9px;
}
.method__steps li::before {
  content: counter(m); position: absolute; left: 0; top: 4px;
  font-family: var(--mono); font-size: 10px; color: var(--ink-3);
  border: 1px solid var(--rule-2); border-radius: 50%;
  width: 17px; height: 17px; display: grid; place-items: center;
}
.method__steps b { color: var(--ink); font-weight: 600; }
.method__note { margin-top: 18px; padding-top: 15px; border-top: 1px dotted var(--rule-2); }
.method__note p { font-size: 13.5px; line-height: 1.85; color: var(--ink-2); max-width: 66ch; }
.method__note p + p { margin-top: 10px; }
.method__note b { color: var(--ink); font-weight: 600; }
.method .mono, .method__note .mono { font-family: var(--mono); font-size: .94em; background: var(--paper-hi); padding: 1px 4px; }

.dim-sep { color: var(--rule-2); margin: 0 3px; }

/* --- 印章组：主印是类型，代填是另盖的一枚小注 --- */
.seal-wrap { display: flex; flex-direction: column; align-items: center; gap: 16px; flex: none; }
.seal-mark {
  border: 1px solid var(--ink); padding: 5px 11px 6px;
  display: flex; align-items: baseline; gap: 8px;
  transform: rotate(-2.5deg);
  animation: stamp .45s cubic-bezier(.3,1.5,.5,1) .68s both;
}
.seal-mark__t { font-family: var(--serif); font-weight: 700; font-size: 15px; letter-spacing: .12em; }
.seal-mark__s { font-family: var(--mono); font-size: 8.5px; letter-spacing: .22em; color: var(--ink-3); }