:root {
  color-scheme: dark;
  --arcane-bg-void: #0A0910;
  --arcane-bg-surface: #1A1829;
  --arcane-bg-elevated: #221F35;
  --arcane-text-parchment: #EBE3CD;
  --arcane-text-ashen: #8A8398;
  --arcane-text-inverse: #0A0910;
  --arcane-gold: #DFBA72;
  --arcane-gold-bright: #F0D090;
  --arcane-lumos: #F1F6FF;
  --arcane-umbra-dim: rgba(102, 51, 153, .20);
  --arcane-border-gold: rgba(223, 186, 114, .35);
  --arcane-border-subtle: rgba(138, 131, 152, .15);
  --arcane-radius-md: 12px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 2rem; }
body { margin: 0; background: var(--arcane-bg-void); color: var(--arcane-text-parchment); font: 1rem/1.8 system-ui, -apple-system, "Microsoft JhengHei", sans-serif; }
a { color: inherit; text-decoration: none; }
a:focus-visible, summary:focus-visible { outline: 2px solid var(--arcane-lumos); outline-offset: 5px; border-radius: 4px; }
a, summary { -webkit-tap-highlight-color: transparent; }
h1, h2, h3, p { margin-top: 0; }
h1, h2 { font-family: Georgia, "Noto Serif TC", "PMingLiU", serif; }
.shell { width: min(1200px, calc(100% - 96px)); margin-inline: auto; }
.skip-link { position: absolute; top: 8px; left: 8px; z-index: 10; padding: 10px 16px; transform: translateY(-160%); background: var(--arcane-gold); color: var(--arcane-text-inverse); }
.skip-link:focus { transform: none; }
.site-header { min-height: 108px; display: flex; align-items: center; justify-content: space-between; gap: 24px; border-bottom: 1px solid var(--arcane-border-subtle); }
.brand { display: grid; line-height: 1.3; gap: 5px; padding-block: 8px; }
.brand-name { font-family: Georgia, serif; font-size: 1.8rem; font-weight: bold; letter-spacing: -.04em; }
.brand-name span { color: var(--arcane-gold); }
.brand-caption { font-size: .75rem; letter-spacing: .08em; color: var(--arcane-text-ashen); }
nav { display: flex; align-items: center; gap: 30px; }
nav > a { display: inline-flex; align-items: center; min-height: 44px; font-size: .875rem; }
.button { display: inline-flex; justify-content: center; align-items: center; min-height: 54px; padding: 14px 24px; background: var(--arcane-gold); color: var(--arcane-text-inverse); border: 1px solid var(--arcane-gold); border-radius: 6px; font-size: 1rem; font-weight: 700; line-height: 1.5; transition: background .15s, border-color .15s; }
.button:hover { background: var(--arcane-gold-bright); border-color: var(--arcane-gold-bright); }
.button-small { min-height: 44px; padding: 10px 19px; font-size: .875rem; }
.button-secondary { background: transparent; color: var(--arcane-text-parchment); border-color: var(--arcane-border-gold); }
.button-secondary:hover { background: var(--arcane-bg-surface); }
.hero { display: grid; grid-template-columns: 1.12fr 1fr; align-items: center; gap: 72px; padding-block: 82px 92px; }
.eyebrow { margin-bottom: 24px; font: .75rem/1.6 ui-monospace, monospace; letter-spacing: .12em; color: var(--arcane-gold); }
h1 { margin-bottom: 28px; font-size: clamp(2.7rem, 4.4vw, 4.15rem); line-height: 1.3; letter-spacing: -.035em; font-weight: 500; }
h1 span, .final-cta h2 span { color: var(--arcane-gold); }
.intro { max-width: 32em; margin-bottom: 28px; font-size: 1.06rem; line-height: 1.9; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.trial-note { margin: 14px 0 0; color: var(--arcane-text-ashen); font-size: .875rem; }
.audience { display: flex; flex-wrap: wrap; gap: 12px 22px; margin-top: 40px; padding-top: 23px; border-top: 1px solid var(--arcane-border-subtle); font-size: .875rem; }
.audience span { display: flex; align-items: center; gap: 9px; }
.audience span::before { content: ""; width: 4px; height: 4px; background: var(--arcane-gold); transform: rotate(45deg); }
.preview-wrap { min-width: 0; padding: 24px; border: 1px solid var(--arcane-border-subtle); border-radius: var(--arcane-radius-md); background: radial-gradient(ellipse at top right, var(--arcane-umbra-dim), transparent 70%); }
.preview-label { display: flex; justify-content: space-between; gap: 8px; margin-bottom: 18px; font: .75rem/1.5 ui-monospace, monospace; letter-spacing: .08em; color: var(--arcane-text-ashen); }
.quiz-card { padding: 28px; border: 1px solid var(--arcane-border-gold); border-radius: var(--arcane-radius-md); background: var(--arcane-bg-surface); }
.card-topline { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 12px; color: var(--arcane-text-ashen); font-size: .75rem; }
.progress-track { height: 3px; margin-bottom: 32px; background: var(--arcane-border-subtle); }
.progress-track span { display: block; width: 100%; height: 100%; background: var(--arcane-gold); }
.card-eyebrow { margin-bottom: 12px; }
.quiz-card h2 { margin-bottom: 12px; font-size: 2rem; line-height: 1.4; font-weight: 500; }
.preview-hint { margin-bottom: 24px; font-size: .875rem; }
.demo-options { display: grid; gap: 10px; }
details { border: 1px solid var(--arcane-border-subtle); border-radius: 6px; }
summary { display: flex; align-items: center; gap: 12px; min-height: 54px; padding: 12px 16px; cursor: pointer; list-style: none; font-size: .9375rem; }
summary::-webkit-details-marker { display: none; }
summary:hover, details[open] > summary { background: var(--arcane-bg-elevated); }
details[open] { border-color: var(--arcane-border-gold); }
.option-index { display: grid; place-items: center; width: 26px; height: 26px; flex: 0 0 26px; border: 1px solid var(--arcane-border-gold); color: var(--arcane-gold); font: .75rem/1 ui-monospace, monospace; border-radius: 4px; }
.option-mark, .faq summary > span { margin-left: auto; flex: 0 0 auto; color: var(--arcane-gold); font-size: 1.25rem; }
details[open] .option-mark, .faq details[open] summary > span { transform: rotate(45deg); }
.demo-result { padding: 20px 16px 8px; border-top: 1px solid var(--arcane-border-subtle); }
.result-label { color: var(--arcane-gold); font-size: .75rem; }
.demo-result h3 { margin: 8px 0; font-size: 1rem; }
.demo-result p { font-size: .875rem; line-height: 1.8; }
.preview-footnote { margin: 20px 0 0; font-size: .75rem; line-height: 1.7; color: var(--arcane-text-ashen); }
.preview-caption { margin: 18px 0 0; text-align: center; font-size: .875rem; }
.promise { padding-block: 64px 76px; border-block: 1px solid var(--arcane-border-gold); }
.promise h2, .workflow h2, .about h2, .faq h2 { margin-bottom: 34px; font-size: clamp(1.75rem, 3vw, 2.6rem); line-height: 1.5; font-weight: 500; }
.promise h2 span { display: inline-block; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; }
.feature-number { font: .75rem/1.6 ui-monospace, monospace; letter-spacing: .05em; color: var(--arcane-gold); }
.feature-grid h3 { margin: 20px 0 12px; font-size: 1.2rem; }
.feature-grid p { margin: 0; font-size: 1rem; }
.workflow { display: grid; grid-template-columns: 1fr 1fr; gap: 96px; padding-block: 94px; }
.workflow-heading h2 { margin-bottom: 16px; }
.workflow-heading > p:last-child { font-size: 1rem; }
.steps { margin: 0; padding: 0; list-style: none; }
.steps li { display: flex; align-items: flex-start; gap: 22px; padding-block: 22px; border-bottom: 1px solid var(--arcane-border-subtle); }
.steps li:first-child { padding-top: 0; }
.step-number { font: 1.8rem/1.4 Georgia, serif; color: var(--arcane-gold); }
.steps h3 { margin-bottom: 7px; font-size: 1.06rem; }
.steps p { margin: 0; font-size: .9375rem; }
.about { display: grid; grid-template-columns: .8fr 1.4fr; gap: 96px; border-block: 1px solid var(--arcane-border-subtle); padding-block: 76px; }
.about h2 { margin-bottom: 20px; }
.linqa-logo { display: block; max-width: 100%; height: auto; }
.about-copy p { font-size: 1rem; }
.about-copy [lang="en"] { line-height: 1.8; }
.development-note { margin-bottom: 0; padding: 18px 22px; border-left: 2px solid var(--arcane-gold); background: var(--arcane-bg-surface); font-size: .875rem !important; }
.faq { max-width: 850px; padding-block: 80px 24px; }
.faq details { margin-bottom: 14px; border-radius: var(--arcane-radius-md); }
.faq summary { min-height: 66px; padding: 16px 24px; font-size: 1rem; }
.faq details > p { margin: 0; padding: 0 24px 24px; font-size: 1rem; }
.final-cta { padding-block: 96px; text-align: center; }
.final-cta h2 { margin-bottom: 30px; font-size: clamp(2rem, 3.6vw, 3.2rem); line-height: 1.5; font-weight: 500; }
.site-footer { padding-block: 24px; display: flex; align-items: center; gap: 30px; border-top: 1px solid var(--arcane-border-subtle); }
.site-footer .brand-name { font-size: 1.25rem; }
.site-footer p { margin: 0; flex: 1; font-size: .875rem; color: var(--arcane-text-ashen); }
.site-footer > a:last-child { display: inline-flex; align-items: center; min-height: 44px; font-size: .875rem; }
@media (max-width: 1000px) {
  .shell { width: calc(100% - 48px); }
  .hero { gap: 36px; grid-template-columns: 1fr 1fr; padding-block: 60px; }
  .preview-wrap { padding: 16px; }
  .quiz-card { padding: 22px; }
  .desktop-break { display: none; }
  .feature-grid { gap: 28px; }
  .workflow, .about { gap: 48px; }
}
@media (max-width: 760px) {
  .shell { width: calc(100% - 40px); }
  .site-header { min-height: 92px; gap: 12px; }
  .brand-name { font-size: 1.5rem; }
  .brand-caption { font-size: .75rem; letter-spacing: 0; }
  .nav-about { display: none; }
  nav { gap: 0; }
  .hero { grid-template-columns: 1fr; gap: 44px; padding-block: 48px 56px; }
  h1 { font-size: clamp(2.5rem, 9vw, 3.6rem); line-height: 1.4; }
  .hero .eyebrow { letter-spacing: .06em; }
  .intro { font-size: 1rem; }
  .actions { display: grid; }
  .audience { gap: 12px 18px; margin-top: 28px; }
  .preview-wrap { padding: 14px; }
  .quiz-card { padding: 22px 18px; }
  .promise { padding-block: 44px; }
  .promise h2 span { display: block; }
  .feature-grid { grid-template-columns: 1fr; gap: 30px; }
  .feature-grid article + article { padding-top: 24px; border-top: 1px solid var(--arcane-border-subtle); }
  .feature-grid h3 { margin-top: 12px; }
  .workflow, .about { grid-template-columns: 1fr; gap: 30px; padding-block: 52px; }
  .workflow-heading h2 { margin-bottom: 12px; }
  .faq { padding-top: 52px; }
  .faq summary, .faq details > p { padding-inline: 18px; }
  .final-cta { padding-block: 64px; }
  .site-footer { flex-wrap: wrap; gap: 12px 20px; }
  .site-footer p { order: 3; flex-basis: 100%; }
  .site-footer > a:last-child { margin-left: auto; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}