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summary:after{content:"+";position:absolute;right:0;top:15px;font-size:1.2rem;color:var(--violet2)}.faq-list details[open] summary:after{content:"−"}.faq-list p{margin:0 0 17px;color:var(--muted);font-size:.81rem}.related-section{padding:68px 0 82px;background:#eef4fb}.related-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px}.related-grid a{display:grid;gap:5px;padding:20px;border:1px solid #d5e1ec;border-radius:19px;background:#fff;text-decoration:none;transition:.18s}.related-grid a:nth-child(2){background:#f7f3ff;border-color:#ddd2f4}.related-grid a:nth-child(3){background:#fff9ee;border-color:#ecdcb9}.related-grid a:nth-child(4){background:#effaf6;border-color:#cde7de}.related-grid a:hover{transform:translateY(-2px);box-shadow:0 13px 32px rgba(14,48,80,.09)}.related-grid span{color:var(--violet2);font-size:.64rem;text-transform:uppercase;font-weight:900;letter-spacing:.07em}.related-grid strong{font-size:.98rem}.related-grid small{color:var(--muted);font-size:.73rem}.site-footer{background:#06192f;color:#d5e3ed;padding:50px 0 0}.footer-grid{display:grid;grid-template-columns:1.5fr repeat(3,1fr);gap:40px}.footer-brand img{display:block;width:205px;height:auto}.footer-grid p{max-width:360px;color:#a2b7c6;font-size:.78rem}.footer-grid h3{color:#fff;font-size:.82rem;margin:0 0 12px}.footer-grid a{display:block;color:#afc3d0;text-decoration:none;font-size:.75rem;margin:8px 0}.footer-grid a:hover{color:#fff}.footer-bottom{margin-top:34px;padding:17px 0;border-top:1px solid rgba(255,255,255,.1);color:#849eae;font-size:.68rem}.footer-bottom p{margin:0}.back-to-top{position:fixed;right:18px;bottom:18px;width:44px;height:44px;border:0;border-radius:50%;background:var(--navy);color:#fff;font-size:1.15rem;box-shadow:0 10px 28px rgba(8,29,59,.23);opacity:0;pointer-events:none;transform:translateY(8px);transition:.18s;z-index:30}.back-to-top.is-visible{opacity:1;pointer-events:auto;transform:none}@media(max-width:1100px){.hero-grid{grid-template-columns:1fr 370px;gap:32px}.calculator-grid{grid-template-columns:1fr}.result-panel{position:relative;top:auto}.is-advanced .task-grid{grid-template-columns:repeat(3,1fr)}.example-grid,.mistake-grid{grid-template-columns:1fr 1fr}.concept-grid,.method-grid{grid-template-columns:1fr}.related-grid{grid-template-columns:1fr 1fr}}@media(max-width:820px){:root{--shell:min(100% - 28px,1240px)}.header-inner{min-height:64px}.main-nav{display:none}.header-action{margin-left:auto;font-size:.76rem;padding:9px 12px}.hero-section{padding:28px 0 38px}.hero-grid{grid-template-columns:1fr}.hero-preview{display:none}.hero-copy h1{font-size:clamp(2.3rem,9vw,3.4rem)}.calculator-section{padding-top:18px}.calculator-shell{padding:18px;border-radius:24px}.calculator-heading,.section-heading{display:grid;align-items:start;gap:14px}.mode-switch{width:100%}.quick-flow{grid-template-columns:1fr}.task-grid,.is-advanced .task-grid{grid-template-columns:1fr 1fr}.chooser-grid{grid-template-columns:1fr}.interpretation-grid{grid-template-columns:1fr}.interpretation-check{grid-template-columns:1fr}.context-strip{grid-template-columns:1fr}.faq-list{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr 1fr}.method-steps{grid-template-columns:1fr}}@media(max-width:560px){:root{--shell:calc(100% - 20px)}.brand img{width:158px;height:auto}.header-action{display:none}.hero-section{padding:23px 0 29px}.breadcrumbs{margin-bottom:15px}.hero-copy h1{font-size:2.32rem}.hero-lead{font-size:.92rem;margin-top:14px}.hero-actions{margin-top:18px}.trust-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}.trust-row span:nth-child(3){grid-column:1/3}.calculator-shell{padding:11px}.calculator-heading h2,.section-heading h2{font-size:1.72rem}.task-grid,.is-advanced .task-grid{grid-template-columns:1fr}.task-panel,.advanced-settings{padding:15px}.sentence-form{padding:13px;display:grid;grid-template-columns:1fr}.sentence-form>span{text-align:center}.inline-field,.inline-field.wide,.inline-field.select-field{width:100%;min-width:0}.chain-grid,.settings-grid{grid-template-columns:1fr}.form-actions{display:grid}.metric-grid{grid-template-columns:1fr}.result-panel{padding:15px}.primary-result strong{font-size:2.45rem}.chooser-section,.examples-section,.concept-section,.interpretation-section,.mistakes-section,.method-section,.faq-section,.related-section{padding-top:57px;padding-bottom:57px}.example-grid,.interpretation-grid,.mistake-grid,.concept-comparison,.related-grid{grid-template-columns:1fr}.interpretation-check ol{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.footer-brand img{width:190px}.section-heading>p{font-size:.8rem}}@media(max-width:360px){.hero-copy h1{font-size:2.08rem}.trust-row{grid-template-columns:1fr}.trust-row span:nth-child(3){grid-column:auto}.task-button{padding:12px}.calculator-shell{padding:8px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}

/* Professional visual hierarchy revision 2026-07-30 */
.quick-flow{
  display:flex;
  align-items:center;
  gap:18px;
  margin-top:20px;
  padding:12px 15px;
  border:1px solid #d9e3ed;
  border-radius:15px;
  background:#f3f6fa;
  color:#52657a;
}
.quick-flow>strong{
  flex:0 0 auto;
  color:var(--navy);
  font-size:.78rem;
  letter-spacing:.01em;
}
.quick-flow ol{
  display:flex;
  align-items:center;
  gap:0;
  margin:0;
  padding:0;
  list-style:none;
  min-width:0;
}
.quick-flow li{
  display:flex;
  align-items:center;
  gap:7px;
  position:relative;
  padding-right:30px;
  font-size:.73rem;
  font-weight:760;
  white-space:nowrap;
}
.quick-flow li:not(:last-child)::after{
  content:"→";
  position:absolute;
  right:10px;
  color:#9aa8b8;
  font-weight:700;
}
.quick-flow li span{
  width:24px;
  height:24px;
  display:grid;
  place-items:center;
  border-radius:8px;
  background:#e3e8f2;
  color:#41546d;
  font-size:.63rem;
  font-weight:900;
}
.task-chooser{
  margin-top:16px;
  padding:17px;
  border:1px solid #d8e2ec;
  border-radius:20px;
  background:#fbfcfe;
}
.task-chooser-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:20px;
  margin-bottom:13px;
  padding-bottom:13px;
  border-bottom:1px solid #e3e9f0;
}
.task-chooser-head>div{display:grid;gap:3px}
.choice-kicker{
  color:var(--violet2);
  font-size:.64rem;
  font-weight:900;
  text-transform:uppercase;
  letter-spacing:.09em;
}
.task-chooser h3{
  margin:0;
  font-size:1.05rem;
  line-height:1.25;
}
.task-chooser p{
  margin:0;
  color:var(--muted);
  font-size:.74rem;
}
.choice-count{
  flex:0 0 auto;
  padding:7px 10px;
  border-radius:999px;
  background:#edf1f6;
  color:#55677d;
  font-size:.66rem;
  font-weight:820;
}
.task-grid{margin-top:0}
.task-button{
  background:#fff;
  border-color:#d8e2ec;
  box-shadow:none;
}
.task-button:hover{
  border-color:#a99ae2;
  background:#faf9fd;
}
.task-button.is-active{
  border-color:#8067cf;
  background:#f4f1fb;
  box-shadow:inset 3px 0 0 #7657d7;
}
.task-button.is-active>span{background:#7657d7}

/* Restraint: one dominant accent, semantic colors only */
.interpretation-grid article,
.interpretation-grid article:nth-child(2),
.interpretation-grid article:nth-child(3),
.interpretation-grid article:nth-child(4),
.context-strip article,
.context-strip article:nth-child(2),
.context-strip article:nth-child(3),
.mistake-grid article,
.mistake-grid article:nth-child(even),
.related-grid a,
.related-grid a:nth-child(2),
.related-grid a:nth-child(3),
.related-grid a:nth-child(4){
  background:#fff;
  border-color:#d8e3ec;
}
.interpretation-grid article:nth-child(odd),
.context-strip article:nth-child(odd),
.mistake-grid article:nth-child(odd),
.related-grid a:nth-child(odd){background:#f8fafc}
.interpretation-grid article{border-top:3px solid #c9c0e8}
.interpretation-grid article:nth-child(3n){border-top-color:#9ccfc0}
.related-grid a:hover{border-color:#a99ae2}

@media(max-width:820px){
  .quick-flow{align-items:flex-start;gap:10px}
  .quick-flow ol{display:grid;grid-template-columns:1fr;gap:7px}
  .quick-flow li{padding-right:0;white-space:normal}
  .quick-flow li:not(:last-child)::after{display:none}
  .task-chooser-head{align-items:flex-start}
}
@media(max-width:560px){
  .quick-flow{display:grid;padding:12px}
  .task-chooser{padding:13px}
  .task-chooser-head{display:grid;gap:10px}
  .choice-count{justify-self:start}
}