:root {
  --bg: #fafcfb;
  --bg-alt: #f2f7f5;
  --ink: #15211c;
  --muted: #65716c;
  --green: #0a785d;
  --green-dark: #075846;
  --mint: #e9f5f0;
  --gold: #7a6b42;
  --card: #fff;
  --line: rgba(16, 77, 59, .11);
  --shadow: 0 8px 32px rgba(18, 70, 55, .07);
  --shadow-lift: 0 22px 60px rgba(18, 70, 55, .12);
  --radius: 24px;
  --gradient: linear-gradient(120deg, #2b9b79 0%, #0a785d 58%, #075846 100%);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg); color: var(--ink); line-height: 1.58;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
:lang(zh-Hans), :lang(ja) {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans", "Yu Gothic UI", "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
}
img { display: block; max-width: 100%; }
a { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible {
  outline: 3px solid rgba(10,120,93,.28); outline-offset: 3px;
}
.wrap { width: min(1120px, calc(100% - 44px)); margin: 0 auto; }

.nav {
  position: sticky; top: 0; z-index: 50; border-bottom: 1px solid var(--line);
  background: rgba(251, 251, 253, .84); backdrop-filter: saturate(180%) blur(20px);
}
.nav-inner { height: 56px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 9px; color: var(--ink); font-size: 19px; font-weight: 760; letter-spacing: -.02em; }
.brand:hover { text-decoration: none; }
.brand-logo { width: 32px; height: 32px; flex: 0 0 32px; border-radius: 9px; box-shadow: 0 3px 10px rgba(10,120,93,.18); }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 23px; }
.nav-links a { color: var(--ink); font-size: 14px; opacity: .78; }
.nav-links a:hover { opacity: 1; text-decoration: none; }
.nav-cta { color: #fff !important; opacity: 1 !important; background: var(--green); padding: 8px 15px; border-radius: 999px; font-weight: 700; }
.language-switcher { position: relative; flex: 0 0 auto; }
.language-switcher summary {
  display: inline-flex; align-items: center; gap: 5px; min-width: 47px; padding: 7px 9px;
  border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.78);
  color: var(--ink); cursor: pointer; font-size: 12px; font-weight: 760; list-style: none;
}
.language-switcher summary::-webkit-details-marker { display: none; }
.language-switcher summary::after { content: "⌄"; color: var(--muted); font-size: 11px; transform: translateY(-1px); }
.language-switcher[open] summary { border-color: rgba(10,120,93,.3); background: #fff; }
.language-menu {
  position: absolute; top: calc(100% + 9px); right: 0; display: grid; min-width: 148px;
  padding: 7px; border: 1px solid var(--line); border-radius: 15px; background: #fff;
  box-shadow: var(--shadow-lift);
}
.language-menu a { padding: 9px 11px; border-radius: 10px; color: var(--ink); font-size: 13px; white-space: nowrap; }
.language-menu a:hover { background: var(--mint); text-decoration: none; }
.language-menu a[aria-current="true"] { color: var(--green); background: var(--mint); font-weight: 760; }

.hero { position: relative; overflow: hidden; padding: 86px 0 32px; text-align: center; }
.hero::before, .hero::after { content: ""; position: absolute; z-index: -1; border-radius: 50%; pointer-events: none; }
.hero::before { width: 680px; height: 680px; left: -280px; top: -180px; background: radial-gradient(circle, rgba(43,155,121,.12), transparent 67%); }
.hero::after { width: 760px; height: 760px; right: -300px; top: 210px; background: radial-gradient(circle, rgba(183,131,32,.08), transparent 67%); }
.hero-cat { padding: 76px 0 58px; }
.hero-grid { display: grid; grid-template-columns: 1.02fr .98fr; align-items: center; gap: clamp(42px, 7vw, 86px); }
.hero-copy { text-align: left; }
.hero-copy h1 { max-width: 720px; margin: 0 0 24px; font-size: clamp(3rem, 6.3vw, 5.15rem); }
.hero-copy .hero-sub { max-width: 690px; margin: 0 0 30px; }
.hero-copy .cta-row { justify-content: flex-start; }
.hero-copy .cta-note { line-height: 1.75; }
.hero-text-link { display: inline-block; margin-top: 4px; font-size: 13px; font-weight: 760; }
.eyebrow { display: inline-block; color: var(--green); font-weight: 750; font-size: 14px; letter-spacing: .09em; text-transform: uppercase; margin-bottom: 18px; }
h1 { max-width: 920px; margin: 0 auto 22px; font-size: clamp(2.65rem, 7vw, 5.15rem); line-height: 1.03; letter-spacing: -.045em; font-weight: 780; }
.grad { background: var(--gradient); background-clip: text; -webkit-background-clip: text; color: transparent; }
.hero-sub { max-width: 760px; margin: 0 auto 28px; color: var(--muted); font-size: clamp(1.08rem, 2.2vw, 1.35rem); }
.badges { display: flex; flex-wrap: wrap; justify-content: center; gap: 9px; margin: 0 auto 32px; }
.badge { background: var(--bg-alt); border: 1px solid var(--line); padding: 7px 15px; border-radius: 999px; font-size: 13px; font-weight: 680; }
.cta-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 13px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 9px; padding: 15px 27px; border-radius: 999px; font-size: 16px; font-weight: 750; border: 0; transition: transform .18s, box-shadow .18s, background .18s; }
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { color: #fff; background: var(--gradient); box-shadow: 0 8px 24px rgba(10,120,93,.22); }
.btn-primary:hover { box-shadow: 0 12px 32px rgba(10,120,93,.30); }
.btn-secondary { color: var(--green); background: #fff; border: 1.5px solid var(--green); }
.btn-secondary:hover { background: var(--mint); }
.cta-note { margin-top: 15px; color: var(--muted); font-size: 12.5px; }

.cat-engine {
  position: relative; overflow: hidden; padding: 28px; text-align: left;
  background: rgba(255,255,255,.93); border: 1px solid rgba(10,120,93,.16); border-radius: 30px;
  box-shadow: 0 28px 80px rgba(18,70,55,.14);
}
.cat-engine::before {
  content: ""; position: absolute; width: 250px; height: 250px; right: -110px; top: -115px;
  border-radius: 50%; background: radial-gradient(circle, rgba(43,155,121,.16), transparent 68%); pointer-events: none;
}
.cat-engine-head { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-bottom: 13px; }
.cat-engine-head .kicker { margin: 0; }
.adaptive-pill { display: inline-flex; align-items: center; gap: 7px; color: var(--green-dark); font-size: 11px; font-weight: 800; letter-spacing: .04em; }
.adaptive-pill > span { width: 8px; height: 8px; border-radius: 50%; background: #2b9b79; box-shadow: 0 0 0 5px rgba(43,155,121,.12); }
.cat-engine h2 { position: relative; max-width: 500px; margin-bottom: 24px; font-size: clamp(1.65rem, 3.2vw, 2.35rem); }
.cat-engine-flow { position: relative; display: grid; list-style: none; gap: 0; }
.cat-engine-flow li { position: relative; display: grid; grid-template-columns: 36px 1fr; align-items: start; gap: 13px; min-height: 67px; padding-bottom: 14px; }
.cat-engine-flow li:not(:last-child)::after { content: ""; position: absolute; left: 17px; top: 36px; bottom: 0; width: 1px; background: linear-gradient(var(--green), rgba(10,120,93,.12)); }
.flow-index { position: relative; z-index: 1; display: grid; place-items: center; width: 36px; height: 36px; border-radius: 12px; color: #fff; background: var(--gradient); font-size: 12px; font-weight: 850; box-shadow: 0 7px 16px rgba(10,120,93,.2); }
.cat-engine-flow b { display: block; color: var(--ink); font-size: 14.5px; }
.cat-engine-flow small { display: block; margin-top: 2px; color: var(--muted); font-size: 12.5px; line-height: 1.45; }
.cat-engine-facts { display: grid; grid-template-columns: repeat(4,1fr); gap: 8px; margin-top: 4px; }
.cat-engine-facts div { min-width: 0; padding: 12px 8px; border: 1px solid var(--line); border-radius: 13px; background: var(--bg-alt); text-align: center; }
.cat-engine-facts strong { display: block; color: var(--green-dark); font-size: 16px; line-height: 1.1; }
.cat-engine-facts span { display: block; margin-top: 5px; color: var(--muted); font-size: 10.5px; line-height: 1.25; }
.cat-engine-note { margin-top: 13px; color: var(--muted); font-size: 10.5px; text-align: center; }

.stats { padding: 72px 0 18px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; text-align: center; }
.stat b { display: block; font-size: clamp(1.9rem, 4vw, 2.7rem); line-height: 1.05; letter-spacing: -.03em; background: var(--gradient); background-clip: text; -webkit-background-clip: text; color: transparent; }
.stat span { color: var(--muted); font-size: 13.5px; }

.section { padding: 94px 0; }
.section.alt { background: var(--bg-alt); }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 52px; }
h2 { font-size: clamp(2rem, 5vw, 3.35rem); line-height: 1.08; letter-spacing: -.035em; margin-bottom: 16px; }
.section-head p, .lead { color: var(--muted); font-size: clamp(1rem, 2vw, 1.18rem); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 29px 27px; box-shadow: var(--shadow); }
.feature { transition: transform .2s, box-shadow .2s, border-color .2s; }
.feature:hover { transform: translateY(-3px); box-shadow: var(--shadow-lift); border-color: rgba(10,120,93,.28); }
.icon { display: grid; place-items: center; width: 45px; height: 45px; margin-bottom: 17px; border-radius: 13px; background: var(--mint); color: var(--green); font-size: 21px; font-weight: 800; }
.feature h3, .card h3 { margin-bottom: 8px; font-size: 18px; line-height: 1.25; }
.feature p, .card p { color: var(--muted); font-size: 14.5px; }

.split { display: grid; grid-template-columns: .95fr 1.05fr; align-items: center; gap: 70px; }
.split-copy h2 { margin-bottom: 18px; }
.split-copy > p { color: var(--muted); font-size: 17px; margin-bottom: 22px; }
.cat-primary { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.cat-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; margin-top: 26px; }
.cat-actions .btn { padding: 13px 21px; font-size: 14px; }
.check-list { list-style: none; display: grid; gap: 12px; }
.check-list li { position: relative; padding-left: 30px; }
.check-list li::before { content: "✓"; position: absolute; left: 0; top: 1px; display: grid; place-items: center; width: 20px; height: 20px; border-radius: 50%; color: #fff; background: var(--green); font-size: 12px; font-weight: 800; }
.cat-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.cat-fact { min-height: 150px; padding: 25px; display: flex; flex-direction: column; justify-content: space-between; background: #fff; border: 1px solid var(--line); border-radius: 22px; box-shadow: var(--shadow); }
.cat-fact strong { display: block; font-size: clamp(2rem, 4vw, 3.3rem); line-height: 1; letter-spacing: -.045em; background: var(--gradient); background-clip: text; -webkit-background-clip: text; color: transparent; }
.cat-fact span { color: var(--muted); font-size: 14px; font-weight: 650; }

.seo-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.seo-card { position: relative; padding-bottom: 58px; }
.seo-card .text-link { position: absolute; left: 27px; bottom: 26px; font-weight: 720; }
.kicker { display: inline-block; margin-bottom: 12px; color: var(--green); font-size: 12px; font-weight: 780; letter-spacing: .08em; text-transform: uppercase; }
.faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.faq-item h3 { margin-bottom: 8px; font-size: 17px; }
.faq-item p { color: var(--muted); font-size: 14.5px; }

.quote { padding: 102px 0; text-align: center; }
.quote strong { display: block; max-width: 900px; margin: 0 auto 17px; font-size: clamp(1.8rem, 4.5vw, 3.25rem); line-height: 1.16; letter-spacing: -.035em; }
.quote p { color: var(--muted); }
.final-cta { padding: 96px 0; text-align: center; background: var(--bg-alt); }
.final-cta p { max-width: 660px; margin: 0 auto 30px; color: var(--muted); font-size: 17px; }

.page-hero { padding: 74px 0 52px; text-align: center; }
.page-hero h1 { font-size: clamp(2.35rem, 6vw, 4.4rem); }
.content { width: min(820px, calc(100% - 44px)); margin: 0 auto; padding: 40px 0 92px; }
.content h2 { margin: 54px 0 16px; font-size: clamp(1.65rem, 4vw, 2.4rem); }
.content h3 { margin: 30px 0 9px; }
.content p, .content li { color: #3e4c45; font-size: 17px; }
.content p { margin-bottom: 18px; }
.content ul, .content ol { padding-left: 24px; margin: 0 0 22px; }
.content li { margin-bottom: 8px; }
.callout { margin: 28px 0; padding: 22px 24px; background: var(--mint); border-left: 4px solid var(--green); border-radius: 0 16px 16px 0; }
.callout p:last-child { margin: 0; }
.domain-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 22px 0 30px; }
.domain { padding: 16px 18px; background: var(--bg-alt); border: 1px solid var(--line); border-radius: 14px; font-size: 14px; }
.domain b { float: right; color: var(--green); }
.compare-table { width: 100%; border-collapse: collapse; margin: 24px 0 34px; font-size: 15px; }
.compare-table th, .compare-table td { border-bottom: 1px solid var(--line); padding: 14px 12px; text-align: left; vertical-align: top; }
.compare-table th { background: var(--bg-alt); font-size: 13px; }
.compare-table td:first-child { font-weight: 700; }

.quiz { padding: 0 0 90px; }
.quiz-shell { width: min(760px, calc(100% - 36px)); margin: 0 auto; }
.quiz-meta { display: flex; justify-content: space-between; color: var(--muted); font-size: 13px; margin-bottom: 10px; }
.progress { height: 8px; background: #e7ece9; border-radius: 999px; overflow: hidden; margin-bottom: 20px; }
.progress > span { display: block; height: 100%; width: 10%; background: var(--gradient); transition: width .25s; }
.question-card { min-height: 360px; }
.question-domain { color: var(--green); font-size: 12px; font-weight: 780; text-transform: uppercase; letter-spacing: .08em; }
.question-card h2 { margin: 12px 0 24px; font-size: clamp(1.25rem, 3vw, 1.65rem); line-height: 1.35; letter-spacing: -.015em; }
.answers { display: grid; gap: 11px; }
.answer { display: flex; align-items: flex-start; gap: 12px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 14px; cursor: pointer; transition: border-color .15s, background .15s; }
.answer:hover { border-color: rgba(10,120,93,.38); background: #f5faf8; }
.answer input { margin-top: 4px; accent-color: var(--green); }
.answer.is-correct { border-color: rgba(34,139,83,.42); background: #f1faf5; }
.answer.is-selected-wrong { border-color: rgba(190,83,68,.42); background: #fff6f4; }
.answer.is-locked { cursor: default; }
.analysis-panel[hidden] { display: none; }
.analysis-panel { margin-top: 24px; padding: 24px; border: 1px solid rgba(10,120,93,.17); border-radius: 20px; background: linear-gradient(145deg,#f2faf7,#fff); box-shadow: 0 12px 34px rgba(18,70,55,.08); animation: analysis-in .24s ease-out; }
@keyframes analysis-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.analysis-label { display: inline-flex; align-items: center; gap: 7px; margin-bottom: 12px; color: var(--green); font-size: 11px; font-weight: 850; letter-spacing: .09em; text-transform: uppercase; }
.analysis-verdict { margin-bottom: 18px; font-size: 20px; line-height: 1.25; }
.analysis-verdict.correct { color: #167344; }
.analysis-verdict.review { color: var(--green); }
.analysis-best { margin-bottom: 20px; padding: 15px 17px; border-radius: 14px; background: #fff; border: 1px solid var(--line); }
.analysis-best b { display: block; margin-bottom: 4px; font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.analysis-best p { color: var(--ink); font-size: 15px; }
.option-analysis { display: grid; gap: 10px; margin-bottom: 20px; }
.option-row { display: grid; grid-template-columns: 28px 1fr; gap: 10px; padding: 12px 13px; border-radius: 12px; background: rgba(255,255,255,.72); }
.option-letter { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 8px; color: var(--muted); background: #f0eeed; font-size: 12px; font-weight: 800; }
.option-row.correct .option-letter { color: #fff; background: #228b53; }
.option-copy b { display: block; margin-bottom: 3px; font-size: 13px; }
.option-copy span { color: var(--muted); font-size: 13px; line-height: 1.45; }
.insight-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
.insight { padding: 14px; border-radius: 13px; background: #fff; border: 1px solid var(--line); }
.insight b { display: block; margin-bottom: 5px; color: var(--green); font-size: 11px; text-transform: uppercase; letter-spacing: .05em; }
.insight p { color: var(--muted); font-size: 12.5px; line-height: 1.45; }
.quiz-actions { display: flex; align-items: center; justify-content: flex-end; margin-top: 20px; }
.quiz button { cursor: pointer; }
.result { display: none; text-align: center; }
.result-score { font-size: 5rem; line-height: 1; font-weight: 800; background: var(--gradient); background-clip: text; -webkit-background-clip: text; color: transparent; }
.result h2 { margin: 14px 0 8px; }
.result p { color: var(--muted); margin-bottom: 22px; }
.explanations { display: grid; gap: 14px; margin-top: 30px; text-align: left; }
.explanation { padding: 18px; background: var(--bg-alt); border-radius: 14px; font-size: 14px; }
.explanation b { display: block; margin-bottom: 5px; }

:lang(zh-Hans) h1, :lang(zh-Hans) h2, :lang(ja) h1, :lang(ja) h2 { letter-spacing: -.025em; }
:lang(zh-Hans) .eyebrow, :lang(zh-Hans) .kicker, :lang(ja) .eyebrow, :lang(ja) .kicker {
  letter-spacing: .035em; text-transform: none;
}
:lang(zh-Hans) .question-card h2, :lang(ja) .question-card h2 { line-height: 1.55; }

footer { border-top: 1px solid var(--line); padding: 34px 0 44px; color: var(--muted); font-size: 12.5px; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 9px 22px; justify-content: center; text-align: center; }
.footer-legal { width: 100%; max-width: 820px; margin-top: 7px; }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero-copy { text-align: center; }
  .hero-copy h1 { margin-inline: auto; }
  .hero-copy .hero-sub { margin-inline: auto; }
  .hero-copy .cta-row { justify-content: center; }
  .cat-engine { width: min(660px, 100%); margin: 0 auto; }
  .feature-grid, .seo-cards, .faq-grid { grid-template-columns: 1fr 1fr; }
  .feature-grid .feature:last-child, .seo-cards .seo-card:last-child { grid-column: 1 / -1; }
  .split { grid-template-columns: 1fr; gap: 45px; text-align: center; }
  .check-list { width: min(520px, 100%); margin: 0 auto; text-align: left; }
}
@media (max-width: 660px) {
  .nav-anchor { display: none; }
  .wrap { width: min(100% - 32px, 1120px); }
  .hero { padding-top: 64px; }
  .hero-cat { padding-bottom: 44px; }
  .hero-grid { gap: 36px; }
  .hero-copy .cta-row { align-items: stretch; flex-direction: column; }
  .hero-copy .cta-row .btn { width: 100%; }
  .cat-engine { padding: 22px 19px; border-radius: 23px; }
  .cat-engine-facts { grid-template-columns: 1fr 1fr; }
  .cat-actions { align-items: stretch; flex-direction: column; text-align: center; }
  .cat-actions .btn { width: 100%; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 28px 12px; }
  .feature-grid, .seo-cards, .domain-grid, .faq-grid { grid-template-columns: 1fr; }
  .feature-grid .feature:last-child, .seo-cards .seo-card:last-child { grid-column: auto; }
  .section { padding: 72px 0; }
  .compare-table { display: block; overflow-x: auto; white-space: nowrap; }
  .insight-grid { grid-template-columns: 1fr; }
}
@media (max-width: 420px) {
  .nav-inner { gap: 10px; }
  .nav-links { gap: 8px; }
  .nav-cta { padding: 7px 11px; font-size: 12px !important; }
  .language-switcher summary { min-width: 43px; padding-inline: 8px; }
  .cat-fact { min-height: 126px; padding: 20px; }
  .cat-engine-head { align-items: flex-start; }
  .adaptive-pill { margin-top: 2px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}