:root {
  --ink: #12283f;
  --navy: #071b33;
  --navy-2: #0c2440;
  --footer: #051325;
  --green: #21b573;
  --green-dark: #1a9d63;
  --cyan: #5bb8e8;
  --cyan-dark: #3a92c6;
  --orange: #f2b32c;
  --orange-dark: #c78d14;
  --purple: #9f8cf5;
  --purple-dark: #7f6ae0;
  --paper: #ffffff;
  --canvas: #f6f9fb;
  --mist: #edf3f7;
  --line: #e3eaf1;
  --muted: #5c6b7e;
  --dark-body: #b9c7d6;
  --dark-fine: #7c8ea1;
  --success: #1a9d63;
  --danger: #b23232;
  --serif: "Poppins", Arial, sans-serif;
  --sans: "Inter", Arial, sans-serif;
  --shadow: 0 18px 44px rgba(7, 27, 51, 0.12);
  --card-shadow: 0 6px 20px -12px rgba(7, 27, 51, 0.2);
  --glow: 0 8px 24px rgba(33, 181, 115, 0.3);
  --radius: 8px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--sans); font-size: 16px; line-height: 1.65; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-family: var(--serif); letter-spacing: 0; }
h1, h2 { font-weight: 800; line-height: 1.05; }
h1 { font-size: 4.75rem; }
h2 { font-size: 3rem; }
h3 { font-size: 1.15rem; line-height: 1.3; font-weight: 700; }
.shell { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.section { padding: 88px 0; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; left: 16px; top: -60px; z-index: 100; background: var(--paper); color: var(--ink); padding: 10px 14px; }
.skip-link:focus { top: 12px; }

.utility { background: var(--footer); color: var(--dark-body); font-size: 0.74rem; }
.utility-inner { min-height: 34px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.utility a { color: var(--cyan); font-weight: 600; text-decoration: none; }
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(7,27,51,0.98); border-bottom: 1px solid #17314d; color: #fff; }
.nav-row { min-height: 76px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 34px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-mark { display: grid; width: 31px; height: 31px; place-items: center; border-radius: 8px; background: var(--green); color: var(--navy); font-family: var(--serif); font-size: 0.68rem; font-weight: 800; }
.brand strong { color: #fff; font-family: var(--serif); font-size: 0.94rem; font-weight: 700; }
.primary-nav { display: flex; align-items: center; justify-content: flex-end; gap: 26px; }
.primary-nav a { color: #d7e2ec; text-decoration: none; font-family: var(--serif); font-size: 0.78rem; font-weight: 600; }
.primary-nav a:hover { color: #fff; }
.nav-toggle { display: none; }
.button { display: inline-flex; min-height: 50px; align-items: center; justify-content: center; gap: 8px; padding: 12px 24px; border: 2px solid var(--green); border-radius: 9999px; background: var(--green); color: var(--navy); font-family: var(--serif); font-size: 0.88rem; font-weight: 600; text-decoration: none; cursor: pointer; transition: background 160ms cubic-bezier(0.23, 1, 0.32, 1), border-color 160ms cubic-bezier(0.23, 1, 0.32, 1), transform 160ms cubic-bezier(0.23, 1, 0.32, 1), box-shadow 160ms cubic-bezier(0.23, 1, 0.32, 1); }
.button:hover { background: var(--green-dark); border-color: var(--green-dark); box-shadow: var(--glow); transform: translateY(-1px); }
.button-small { min-height: 42px; padding: 9px 16px; font-size: 0.84rem; }
.button-ghost { background: transparent; color: var(--ink); border-color: var(--navy); }
.button-ghost:hover { background: var(--navy); border-color: var(--navy); color: var(--paper); box-shadow: none; }
.button-dark { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.button-dark:hover { background: var(--navy); border-color: var(--navy); box-shadow: none; }
.button:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 24px; }
.text-link { color: var(--green-dark); font-weight: 700; text-decoration: none; }
.text-link:hover { text-decoration: underline; }
.eyebrow, .kicker { display: block; color: var(--green-dark); font-size: 0.7rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; }
.kicker { color: var(--orange-dark); }

.home-hero { min-height: min(700px, calc(100vh - 172px)); display: flex; align-items: center; background: var(--canvas); overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; align-items: center; gap: 64px; padding-top: 48px; padding-bottom: 56px; }
.hero-copy h1 { max-width: 760px; margin: 16px 0 24px; }
.hero-copy > p { max-width: 650px; color: var(--muted); font-size: 1.1rem; }
.hero-facts { display: flex; flex-wrap: wrap; gap: 10px 24px; padding: 0; margin: 0; list-style: none; color: var(--muted); font-size: 0.82rem; font-weight: 700; }
.hero-facts li::before { content: ""; display: inline-block; width: 8px; height: 8px; margin-right: 8px; border-radius: 50%; background: var(--cyan); }
.product-stage { position: relative; padding: 64px 0 74px 34px; }
.product-stage::before { content: ""; position: absolute; inset: 10px -20vw 10px 10%; background: var(--navy); }
.product-stage > img { position: relative; width: 100%; border: 1px solid #6c8590; box-shadow: var(--shadow); }
.product-label { position: absolute; z-index: 2; left: 0; top: 18px; display: grid; min-width: 250px; padding: 15px 18px; background: var(--paper); border-left: 5px solid var(--cyan); box-shadow: 0 10px 24px rgba(7,21,31,0.12); }
.product-label span { color: var(--cyan-dark); font-size: 0.68rem; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; }
.product-label strong { font-family: var(--serif); font-size: 1.25rem; font-weight: 400; }
.result-chip { position: absolute; z-index: 2; right: 0; bottom: 18px; display: grid; max-width: 310px; padding: 17px 20px; background: var(--orange); border-left: 6px solid var(--ink); }
.result-chip span { font-size: 0.76rem; }
.fact-strip { background: var(--ink); color: var(--paper); }
.fact-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.fact-grid > div { display: grid; gap: 2px; padding: 25px 32px; border-right: 1px solid #31505e; }
.fact-grid > div:last-child { border-right: 0; }
.fact-grid strong { font-family: var(--serif); color: #fff; font-size: 1.85rem; font-weight: 400; }
.fact-grid span { color: #aac0c9; font-size: 0.75rem; font-weight: 700; }
.current-notice { padding: 58px 0; background: var(--cyan); }
.notice-row { display: flex; align-items: center; justify-content: space-between; gap: 48px; }
.notice-row > div { max-width: 810px; }
.notice-row .eyebrow { color: var(--ink); }
.notice-row h2 { margin: 6px 0 12px; font-size: 2.8rem; }
.notice-row p { margin-bottom: 0; }

.split-heading { display: flex; align-items: end; justify-content: space-between; gap: 64px; margin-bottom: 38px; }
.split-heading > div { max-width: 700px; }
.split-heading h2, .section-title-block h2 { margin: 10px 0 0; }
.split-heading > p, .section-title-block > p { max-width: 480px; margin-bottom: 4px; color: var(--muted); }
.card-grid { display: grid; gap: 18px; }
.card-grid.three { grid-template-columns: repeat(3, 1fr); }
.card-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card { min-width: 0; padding: 30px; border: 1px solid var(--line); border-top: 5px solid var(--cyan); border-radius: 4px; background: var(--paper); }
.card:nth-child(3n + 2) { border-top-color: var(--orange); }
.card h3 { margin: 12px 0 14px; font-size: 1.26rem; }
.card p { color: var(--muted); }

.product-section { background: var(--ink); color: var(--paper); }
.product-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; align-items: center; gap: 80px; }
.product-copy h2 { margin: 12px 0 22px; }
.product-copy > p { color: #b9cbd1; }
.product-section .eyebrow { color: #66d6e8; }
.steps { margin: 30px 0 34px; padding: 0; list-style: none; counter-reset: step; }
.steps li { display: grid; grid-template-columns: 34px 100px 1fr; align-items: baseline; gap: 12px; padding: 13px 0; border-top: 1px solid #294552; counter-increment: step; }
.steps li::before { content: "0" counter(step); color: var(--orange); font-size: 0.74rem; font-weight: 800; }
.steps span { color: #aabfc7; font-size: 0.88rem; }
.media-stack { position: relative; min-height: 540px; }
.media-stack img { position: absolute; width: 82%; border: 1px solid #58717c; box-shadow: 0 26px 50px rgba(0,0,0,0.32); }
.media-stack img:first-child { top: 0; left: 0; }
.media-stack img:last-child { right: 0; bottom: 0; }

.free-band { background: var(--mist); }
.free-grid { display: grid; grid-template-columns: 0.8fr 1.2fr; align-items: center; gap: 72px; }
.free-grid h2 { margin: 10px 0 16px; }
.sample-links { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); }
.sample-links a { min-width: 0; display: grid; padding: 24px 18px; background: var(--paper); border-right: 1px solid var(--line); text-decoration: none; }
.sample-links a:last-child { border-right: 0; }
.sample-links a:hover { background: var(--cyan); }
.sample-links strong { font-family: var(--serif); font-size: 1.4rem; font-weight: 400; }
.sample-links span { color: var(--muted); font-size: 0.72rem; }

.plans-section { background: var(--canvas); }
.section-title-block { margin-bottom: 42px; text-align: center; }
.section-title-block > p { margin: 14px auto 0; }
.plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: stretch; }
.plan { position: relative; display: flex; flex-direction: column; padding: 34px 28px 28px; border: 1px solid var(--line); border-radius: 4px; background: var(--paper); }
.plan-featured { border: 3px solid var(--cyan); padding: 32px 26px 26px; }
.plan-badge { position: absolute; top: 0; right: 0; padding: 7px 10px; background: var(--cyan); font-size: 0.68rem; font-weight: 800; text-transform: uppercase; }
.plan h3 { margin: 12px 0; font-size: 1.35rem; }
.plan > p { min-height: 78px; color: var(--muted); }
.price { margin: 8px 0 24px; font-family: var(--serif); font-size: 2.7rem; }
.price small { font-family: var(--sans); color: var(--muted); font-size: 0.72rem; }
.plan ul { flex: 1; margin: 0 0 28px; padding: 0; list-style: none; }
.plan li { padding: 10px 0 10px 22px; border-top: 1px solid var(--mist); font-size: 0.84rem; }
.plan li::before { content: "+"; float: left; margin-left: -20px; color: var(--cyan-dark); font-weight: 800; }
.fine-print { margin-top: 18px; color: var(--muted); font-size: 0.75rem; text-align: center; }
.final-cta { background: var(--orange); text-align: center; }
.final-cta .shell { max-width: 800px; }
.final-cta .eyebrow { color: var(--ink); }
.final-cta h2 { margin: 10px 0 18px; }

.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; padding-top: 18px; padding-bottom: 18px; color: var(--muted); font-size: 0.72rem; }
.breadcrumbs a { color: var(--cyan-dark); }
.breadcrumbs i { font-style: normal; color: #9aabb1; }
.article-hero { padding: 72px 0 84px; background: var(--canvas); border-bottom: 1px solid var(--line); }
.article-hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; align-items: end; gap: 80px; }
.article-hero h1 { margin: 14px 0 22px; font-size: 4rem; }
.article-hero-grid > div > p { max-width: 720px; color: var(--muted); font-size: 1.05rem; }
.reviewed { display: flex; flex-wrap: wrap; gap: 10px 28px; margin-top: 28px; color: var(--muted); font-size: 0.75rem; font-weight: 700; }
.reviewed span::before { content: ""; display: inline-block; width: 7px; height: 7px; margin-right: 8px; border-radius: 50%; background: var(--success); }
.reviewed a { color: inherit; text-underline-offset: 3px; }
.answer-box { padding: 28px; background: var(--navy); color: var(--paper); border-left: 7px solid var(--cyan); }
.answer-box span { color: #64d9eb; font-size: 0.72rem; font-weight: 800; letter-spacing: 0.13em; text-transform: uppercase; }
.answer-box p { margin: 10px 0 0; font-family: var(--serif); font-size: 1.4rem; line-height: 1.35; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: -34px; position: relative; box-shadow: var(--shadow); }
.stat-grid > div { display: grid; padding: 24px; background: var(--paper); border-right: 1px solid var(--line); }
.stat-grid > div:last-child { border-right: 0; }
.stat-grid strong { font-family: var(--serif); font-size: 1.8rem; font-weight: 400; }
.stat-grid span { color: var(--muted); font-size: 0.74rem; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 78px; padding-top: 84px; padding-bottom: 100px; }
.article-section { display: grid; grid-template-columns: 48px 1fr; gap: 22px; padding: 0 0 48px; margin-bottom: 48px; border-bottom: 1px solid var(--line); }
.section-number { padding-top: 9px; color: var(--orange-dark); font-size: 0.72rem; font-weight: 800; }
.article-section h2 { margin-bottom: 18px; font-size: 2.65rem; }
.article-section p { max-width: 760px; color: #344b55; font-size: 1.01rem; }
.faq-block { padding-top: 10px; }
.faq-block h2 { margin: 8px 0 24px; }
details { border-top: 1px solid var(--line); }
details:last-child { border-bottom: 1px solid var(--line); }
summary { position: relative; padding: 20px 42px 20px 0; font-weight: 800; cursor: pointer; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 8px; color: var(--cyan-dark); font-size: 1.35rem; }
details[open] summary::after { content: "-"; }
details p { padding: 0 50px 20px 0; color: var(--muted); }
.source-block { margin-top: 64px; padding: 28px; background: var(--canvas); border-left: 5px solid var(--orange); }
.source-block h2 { font-family: var(--sans); font-size: 1rem; }
.source-block p, .source-block li { color: var(--muted); font-size: 0.82rem; }
.source-block a { color: var(--cyan-dark); }
.article-aside { position: relative; }
.article-aside > div { position: sticky; top: 116px; padding: 26px; background: var(--ink); color: var(--paper); }
.article-aside h2 { margin: 10px 0 15px; font-size: 1.75rem; }
.article-aside p { color: #acc0c8; font-size: 0.86rem; }
.article-aside nav { display: grid; gap: 10px; margin-top: 30px; padding: 24px; border: 1px solid var(--line); }
.article-aside nav strong { font-size: 0.76rem; letter-spacing: 0.12em; text-transform: uppercase; }
.article-aside nav a { color: var(--cyan-dark); font-size: 0.82rem; font-weight: 700; }

.listing-hero, .pricing-hero { padding: 80px 0 90px; background: var(--navy); color: var(--paper); }
.listing-hero .shell, .pricing-hero .shell { max-width: 880px; margin-left: max(20px, calc((100% - 1180px) / 2)); }
.listing-hero h1, .pricing-hero h1 { margin: 14px 0 20px; }
.listing-hero p, .pricing-hero p { max-width: 750px; color: #bad0d8; font-size: 1.08rem; }
.listing-hero .eyebrow, .pricing-hero .eyebrow { color: #6ed9ea; }
.topic-nav { display: flex; flex-wrap: wrap; margin-bottom: 36px; border-bottom: 1px solid var(--line); }
.topic-nav a { padding: 12px 20px; color: var(--cyan-dark); font-size: 0.82rem; font-weight: 800; text-decoration: none; }
.topic-nav a:first-child { padding-left: 0; }
.button-on-dark { background: transparent; border-color: #fff; color: #fff; }
.button-on-dark:hover { background: #fff; border-color: #fff; color: var(--ink); }

.encyclopedia-hero .button-row { margin-bottom: 0; }
.encyclopedia-jump { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: -28px; position: relative; box-shadow: var(--shadow); }
.encyclopedia-jump a { display: grid; padding: 22px 28px; background: var(--paper); border-right: 1px solid var(--line); text-decoration: none; }
.encyclopedia-jump a:last-child { border-right: 0; }
.encyclopedia-jump a:hover { background: var(--mist); }
.encyclopedia-jump strong { font-family: var(--serif); font-size: 1.5rem; font-weight: 400; }
.encyclopedia-jump span { color: var(--muted); font-size: 0.75rem; font-weight: 700; }
.encyclopedia-part:nth-of-type(even) { background: var(--canvas); }
.evidence-band { background: var(--ink); color: var(--paper); }
.evidence-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: start; }
.evidence-grid h2 { margin: 10px 0 0; }
.evidence-grid p { color: #b7cbd2; }
.evidence-grid .eyebrow { color: #70dbea; }
.evidence-grid .text-link { color: #70dbea; }

.domain-hero { padding: 72px 0 80px; background: var(--canvas); border-bottom: 1px solid var(--line); }
.domain-hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 72px; align-items: end; }
.domain-hero h1 { max-width: 850px; margin: 14px 0 22px; font-size: 4.5rem; overflow-wrap: anywhere; }
.domain-hero p { max-width: 760px; color: var(--muted); }
.weight-box { padding: 28px; background: var(--navy); border-left: 7px solid var(--orange); color: var(--paper); }
.weight-box strong { display: block; font-family: var(--serif); font-size: 4.4rem; font-weight: 400; line-height: 1; }
.weight-box span { display: block; color: #7bdcea; font-weight: 800; }
.weight-box p { margin: 16px 0 0; color: #b9ccd3; font-size: 0.8rem; }
.domain-layout { display: grid; grid-template-columns: 245px minmax(0, 1fr); gap: 64px; align-items: start; }
.domain-nav { display: grid; border: 1px solid var(--line); }
.domain-nav strong { padding: 16px; background: var(--ink); color: var(--paper); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; }
.domain-nav a { padding: 13px 16px; border-top: 1px solid var(--line); color: var(--cyan-dark); font-size: 0.77rem; font-weight: 700; text-decoration: none; }
.domain-nav a[aria-current="page"] { padding-left: 12px; border-left: 4px solid var(--orange); background: var(--mist); color: var(--ink); }
.lesson-heading { max-width: 760px; margin-bottom: 34px; }
.lesson-heading h2 { margin: 10px 0 16px; font-size: 2.75rem; }
.lesson-heading p { color: var(--muted); }
.conversion-band { padding: 72px 0; background: var(--mist); }
.conversion-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 56px; align-items: center; }
.conversion-grid h2 { margin: 10px 0 14px; font-size: 2.6rem; }
.conversion-grid p { max-width: 740px; margin: 0; color: var(--muted); }
.conversion-grid .button-row { margin: 0; }

.topic-hero { padding: 64px 0 74px; background: var(--canvas); border-bottom: 1px solid var(--line); }
.topic-hero-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.8fr); gap: 72px; align-items: end; }
.topic-hero h1 { max-width: 820px; margin: 14px 0 20px; font-size: 4.4rem; overflow-wrap: anywhere; }
.topic-hero-grid > div > p { max-width: 690px; color: var(--muted); font-size: 1.04rem; }
.topic-meta { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: -1px; border: 1px solid var(--line); border-top: 0; }
.topic-meta > div { display: grid; padding: 20px 24px; border-right: 1px solid var(--line); }
.topic-meta > div:last-child { border-right: 0; }
.topic-meta strong { font-family: var(--serif); font-size: 1.35rem; font-weight: 400; }
.topic-meta span { color: var(--muted); font-size: 0.72rem; }
.topic-layout, .question-guide-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 78px; padding-top: 76px; padding-bottom: 100px; }
.topic-content > section { margin-bottom: 60px; }
.topic-content > section > h2 { margin: 8px 0 18px; font-size: 2.55rem; }
.topic-content > section > p { max-width: 780px; color: #344b55; font-size: 1.02rem; }
.section-label { color: var(--cyan-dark); font-size: 0.72rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
.scenario-panel { padding: 34px; background: var(--navy); color: var(--paper); border-left: 7px solid var(--cyan); }
.topic-content > .scenario-panel > p { color: #d4e2e6; font-family: var(--serif); font-size: 1.38rem; line-height: 1.45; }
.scenario-panel > div { margin-top: 28px; padding-top: 22px; border-top: 1px solid #45616e; }
.scenario-panel > div strong { color: #72dcea; font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase; }
.scenario-panel > div p { margin: 8px 0 0; color: #afc4cb; font-size: 0.84rem; }
.trap-panel { padding: 30px 34px; background: #fff1e4; border-left: 7px solid var(--orange); }
.topic-content > .trap-panel > p { margin-bottom: 0; color: #593117; font-weight: 700; }
.study-loop { display: grid; grid-template-columns: repeat(3, 1fr); padding: 0; margin: 28px 0 0; border: 1px solid var(--line); list-style: none; }
.study-loop li { display: grid; gap: 5px; padding: 22px; border-right: 1px solid var(--line); }
.study-loop li:last-child { border-right: 0; }
.study-loop strong { color: var(--cyan-dark); font-size: 0.8rem; }
.study-loop span { color: var(--muted); font-size: 0.77rem; }
.related-lessons > div { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); }
.related-lessons > div > a { display: grid; gap: 8px; padding: 20px; border-right: 1px solid var(--line); text-decoration: none; }
.related-lessons > div > a:last-child { border-right: 0; }
.related-lessons > div > a:hover { background: var(--mist); }
.related-lessons strong { color: var(--cyan-dark); font-size: 0.85rem; }
.related-lessons span { color: var(--muted); font-size: 0.72rem; }
.topic-aside { position: relative; }
.topic-aside > div { position: sticky; top: 116px; padding: 26px; background: var(--ink); color: var(--paper); }
.topic-aside h2 { margin: 10px 0 15px; font-size: 1.75rem; }
.topic-aside p { color: #acc0c8; font-size: 0.84rem; }
.topic-aside .button { width: 100%; }
.aside-link { display: block; margin-top: 16px; color: #75dbea; font-size: 0.78rem; font-weight: 800; text-align: center; }
.topic-aside nav { display: grid; gap: 10px; margin-top: 24px; padding: 22px; border: 1px solid var(--line); }
.topic-aside nav strong { font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; }
.topic-aside nav a { color: var(--cyan-dark); font-size: 0.78rem; font-weight: 700; }

.question-guide-list { padding: 90px 0; }
.question-guide-list .card h3 { font-size: 1rem; }
.question-guide-hero { padding: 64px 0 70px; background: var(--navy); color: var(--paper); }
.question-guide-hero .shell { max-width: 930px; }
.question-guide-hero h1 { margin: 12px 0 20px; font-size: 4.4rem; overflow-wrap: anywhere; }
.question-guide-hero p { max-width: 760px; color: #bdd0d7; }
.question-paper { padding: 34px; border: 1px solid var(--line); border-top: 7px solid var(--cyan); }
.question-paper h2 { margin: 10px 0 28px; font-family: var(--sans); font-size: 1.18rem; line-height: 1.55; }
.question-paper ol { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.question-paper li { display: grid; grid-template-columns: 34px minmax(0, 1fr) auto; gap: 12px; align-items: start; padding: 15px; background: var(--canvas); border: 1px solid var(--line); }
.question-paper li > span { display: grid; width: 30px; height: 30px; place-content: center; background: var(--paper); border: 1px solid var(--line); font-weight: 800; }
.question-paper li p { margin: 2px 0 0; font-size: 0.86rem; }
.question-paper li > strong { align-self: center; color: var(--success); font-size: 0.7rem; text-transform: uppercase; }
.question-paper li.correct-answer { background: #e1f3eb; border-color: #76b99f; }
.answer-explanation, .study-transfer { margin-top: 46px; }
.answer-explanation h2, .study-transfer h2 { margin: 8px 0 16px; font-size: 2.35rem; }
.answer-explanation > p, .study-transfer > p { color: #344b55; }
.answer-explanation > div { display: grid; gap: 4px; margin-top: 24px; padding: 18px 20px; background: var(--mist); border-left: 5px solid var(--cyan); }
.answer-explanation > div strong { font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; }
.answer-explanation > div span { color: var(--muted); font-size: 0.8rem; }
.guarantee-band { background: var(--cyan); }
.guarantee-grid { display: grid; grid-template-columns: 280px 1fr; align-items: center; gap: 72px; }
.seal { aspect-ratio: 1; display: grid; place-content: center; border: 2px solid var(--ink); border-radius: 50%; text-align: center; }
.seal strong { font-family: var(--serif); font-size: 3.2rem; font-weight: 400; line-height: 1; }
.seal span { font-size: 0.76rem; font-weight: 800; letter-spacing: 0.16em; text-transform: uppercase; }
.guarantee-grid h2 { margin: 10px 0 20px; }
.faq-wide .shell { max-width: 850px; }
.faq-wide h2 { margin: 10px 0 26px; }
.prose { max-width: 860px; }
.prose h2 { margin: 48px 0 18px; font-size: 2rem; }
.prose > h2:first-child { margin-top: 0; }
.prose h3 { margin: 34px 0 14px; font-size: 1.35rem; }
.prose h4 { margin: 26px 0 10px; font-size: 1rem; }
.prose p { color: #344b55; }
.prose li { margin-bottom: 10px; color: #344b55; }
.prose address { color: #344b55; font-style: normal; line-height: 1.8; }
.prose-media { display: grid; grid-template-columns: 1fr 0.75fr; gap: 68px; align-items: start; }
.prose-media img { width: 100%; max-height: 560px; object-fit: cover; }
.contact-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.contact-grid section { min-width: 0; padding: 28px; border: 1px solid var(--line); border-top: 4px solid var(--green); border-radius: var(--radius); background: #fff; }
.contact-grid section:nth-child(2) { border-top-color: var(--cyan); }
.contact-grid section:nth-child(3) { border-top-color: var(--orange); }
.contact-grid h2 { margin-top: 0; font-size: 1.25rem; }

.quiz-intro { padding: 68px 0; background: var(--navy); color: var(--paper); }
.quiz-intro-grid { display: grid; grid-template-columns: 1.1fr 0.7fr; gap: 80px; align-items: end; }
.quiz-intro h1 { margin: 12px 0 20px; font-size: 4.2rem; }
.quiz-intro p { color: #bad0d8; }
.quiz-intro ul { display: flex; flex-wrap: wrap; gap: 10px 24px; padding: 0; list-style: none; font-size: 0.77rem; font-weight: 700; }
.quiz-intro li::before { content: "+"; margin-right: 8px; color: var(--orange); }
.quiz-source { padding: 26px; border: 1px solid #5d7681; border-left: 5px solid var(--cyan); }
.quiz-source strong { color: #72dcea; font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase; }
.quiz-source p { margin: 10px 0; font-size: 0.84rem; }
.quiz-source a { color: #fff; font-size: 0.8rem; font-weight: 800; }
.quiz-section { padding: 64px 0 100px; background: var(--canvas); min-height: 620px; }
.quiz-app { max-width: 890px; margin-inline: auto; }
.quiz-top { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 24px; margin-bottom: 20px; }
.quiz-meta { display: flex; justify-content: space-between; margin-bottom: 8px; color: var(--muted); font-size: 0.76rem; font-weight: 700; }
.progress { height: 8px; overflow: hidden; background: var(--line); }
.progress > span { display: block; width: 0; height: 100%; background: var(--cyan-dark); transition: width 200ms ease; }
.quiz-score { color: var(--muted); font-size: 0.8rem; }
.question-panel { padding: 42px; background: var(--paper); border: 1px solid var(--line); box-shadow: 0 12px 35px rgba(7,21,31,0.08); }
.question-heading { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.part-chip { padding: 6px 9px; background: var(--mist); color: var(--cyan-dark); font-size: 0.68rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.topic-chip { color: var(--muted); font-size: 0.72rem; font-weight: 700; }
.question-panel h2 { margin-bottom: 28px; font-family: var(--sans); font-size: 1.5rem; font-weight: 700; line-height: 1.45; }
.answers { display: grid; gap: 10px; margin: 0; padding: 0; border: 0; }
.answer-option { position: relative; display: grid; grid-template-columns: 32px 1fr; align-items: start; gap: 12px; min-height: 58px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 4px; cursor: pointer; }
.answer-option:hover { border-color: var(--cyan-dark); background: #f5fcfd; }
.answer-option input { position: absolute; opacity: 0; }
.answer-letter { display: grid; place-items: center; width: 30px; height: 30px; border: 1px solid var(--line); border-radius: 50%; font-weight: 800; }
.answer-option:has(input:checked) { border-color: var(--cyan-dark); background: #e8f9fc; }
.answer-option:has(input:checked) .answer-letter { background: var(--cyan-dark); border-color: var(--cyan-dark); color: var(--paper); }
.answer-option.is-correct { border-color: var(--success); background: #ecf8f3; }
.answer-option.is-correct .answer-letter { background: var(--success); border-color: var(--success); color: #fff; }
.answer-option.is-incorrect { border-color: var(--danger); background: #fff1f1; }
.answer-option.is-incorrect .answer-letter { background: var(--danger); border-color: var(--danger); color: #fff; }
.answer-option.is-locked { cursor: default; }
.feedback { margin-top: 22px; padding: 22px; border-left: 5px solid var(--success); background: #ecf8f3; }
.feedback.incorrect { border-left-color: var(--danger); background: #fff1f1; }
.feedback strong { display: block; margin-bottom: 6px; }
.feedback p { margin-bottom: 8px; }
.feedback small { color: var(--muted); }
.quiz-controls { display: flex; justify-content: space-between; gap: 12px; margin-top: 20px; }
.quiz-controls .button { min-width: 126px; }
.results { padding: 44px; background: var(--paper); border: 1px solid var(--line); box-shadow: 0 12px 35px rgba(7,21,31,0.08); }
.results-header { display: grid; grid-template-columns: 180px 1fr; align-items: center; gap: 38px; }
.score-ring { aspect-ratio: 1; display: grid; place-content: center; border: 12px solid var(--cyan); border-radius: 50%; text-align: center; }
.score-ring strong { font-family: var(--serif); font-size: 3.2rem; font-weight: 400; line-height: 1; }
.score-ring span { color: var(--muted); font-size: 0.72rem; }
.results h2 { margin: 8px 0 12px; }
.results-header p { color: var(--muted); }
.part-results { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 34px 0; }
.part-result { padding: 18px; background: var(--canvas); border-top: 5px solid var(--cyan); }
.part-result:nth-child(2) { border-top-color: var(--orange); }
.part-result:nth-child(3) { border-top-color: var(--navy-2); }
.part-result strong { display: block; font-size: 1.35rem; }
.part-result span { color: var(--muted); font-size: 0.75rem; }
.study-plan { margin-top: 36px; padding: 28px; background: var(--navy); color: var(--paper); }
.study-plan h3 { font-size: 1.25rem; }
.study-plan ol { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 28px; margin-bottom: 28px; padding-left: 22px; color: #c2d2d8; font-size: 0.84rem; }
.result-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.study-plan .button-ghost { border-color: var(--paper); color: var(--paper); }
.study-plan .button-ghost:hover { background: var(--paper); color: var(--navy); }
.noscript { padding: 30px; background: var(--paper); border: 1px solid var(--line); }

.site-footer { padding: 70px 0 24px; background: var(--footer); color: var(--paper); }
.footer-grid { display: grid; grid-template-columns: 1.7fr repeat(3, 1fr); gap: 60px; }
.footer-grid > div { display: grid; align-content: start; gap: 9px; }
.footer-grid strong { margin-bottom: 8px; font-size: 0.78rem; letter-spacing: 0.1em; text-transform: uppercase; }
.footer-grid a { color: #bfd0d6; font-size: 0.78rem; text-decoration: none; }
.footer-grid a:hover { color: #fff; text-decoration: underline; }
.brand-light small { color: #98b0b9; }
.footer-brand p { max-width: 340px; margin-top: 12px; color: #98b0b9; font-size: 0.82rem; }
.legal { display: flex; justify-content: space-between; gap: 24px; margin-top: 50px; padding-top: 20px; border-top: 1px solid #294552; color: #8099a3; font-size: 0.67rem; }
.legal a { color: #a8bdc5; }

/* Operator design system */
.eyebrow-pill { display: inline-flex; padding: 6px 14px; border: 1px solid rgba(33,181,115,0.28); border-radius: 9999px; background: rgba(33,181,115,0.12); color: var(--green); }
.card, .plan, .question-panel, .results, .question-paper, .source-block, .answer-box, .scenario-panel, .trap-panel, .weight-box, .study-plan { border-radius: var(--radius); }
.card { border: 1px solid var(--line); box-shadow: var(--card-shadow); }
.card:nth-child(3n + 2) { border-top-color: var(--line); }
.card h3 { font-family: var(--serif); font-weight: 700; }
.plan { border-radius: var(--radius); box-shadow: var(--card-shadow); }
.plan-featured { border-color: var(--green); }
.plan-badge { border-radius: 0 7px 0 8px; background: var(--green); color: var(--navy); }
.plan li::before { color: var(--green-dark); }
.plans-section { background: #fff; }
.plans-section .section-title-block .eyebrow { color: var(--green-dark); }
.listing-hero, .pricing-hero, .quiz-intro, .question-guide-hero { background: var(--navy); }
.listing-hero .eyebrow, .pricing-hero .eyebrow, .quiz-intro .eyebrow, .question-guide-hero .eyebrow { color: var(--green); }
.article-hero, .domain-hero, .topic-hero { background: var(--canvas); }
.answer-box, .weight-box, .scenario-panel { background: var(--navy); }
.answer-box { border-left-color: var(--green); }
.answer-box span, .weight-box span, .scenario-panel > div strong { color: var(--green); }
.source-block, .trap-panel { border-left-color: var(--orange); }
.evidence-band, .study-plan, .article-aside > div, .topic-aside > div { background: var(--navy); }
.button-on-dark { background: transparent; border-color: #55708c; color: #fff; box-shadow: none; }
.button-on-dark:hover { background: #fff; border-color: #fff; color: var(--navy); box-shadow: none; }
.fact-grid strong, .product-label strong, .sample-links strong, .price, .stat-grid strong, .encyclopedia-jump strong, .weight-box strong, .topic-meta strong, .score-ring strong, .seal strong { font-weight: 800; }

.home-hero { min-height: 680px; display: grid; place-items: center; background: radial-gradient(ellipse 70% 60% at 50% 35%, rgba(33,181,115,0.15), transparent 70%), var(--navy); color: #fff; }
.operator-hero { padding-top: 86px; padding-bottom: 80px; text-align: center; }
.operator-hero .hero-copy { max-width: 960px; margin-inline: auto; }
.operator-hero h1 { max-width: 980px; margin: 24px auto 24px; color: #fff; font-size: 4.75rem; font-weight: 900; }
.operator-hero h1 span, .final-cta h2 span { color: var(--green); }
.operator-hero .hero-copy > p { max-width: 760px; margin-inline: auto; color: var(--dark-body); font-size: 1.04rem; }
.operator-hero .button-row { justify-content: center; margin-top: 32px; }
.operator-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); max-width: 760px; margin: 64px auto 0; }
.operator-stats > div { display: grid; gap: 2px; padding: 0 28px; border-right: 1px solid #29445f; }
.operator-stats > div:last-child { border-right: 0; }
.operator-stats strong { color: var(--green); font-family: var(--serif); font-size: 2.75rem; font-weight: 800; line-height: 1.1; }
.operator-stats > div:nth-child(2) strong { color: var(--orange); }
.operator-stats > div:nth-child(3) strong { color: var(--cyan); }
.operator-stats span { color: var(--dark-body); font-size: 0.72rem; font-weight: 600; }

.operator-tools { background: var(--navy-2); color: #fff; }
.operator-tools .section-title-block { margin-bottom: 42px; }
.operator-tools .section-title-block h2 { max-width: 880px; margin-inline: auto; font-size: 2.65rem; }
.operator-tools .eyebrow { color: var(--cyan); }
.tool-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.tool-card { min-width: 0; min-height: 210px; padding: 28px; border: 1px solid rgba(91,184,232,0.2); border-radius: var(--radius); background: linear-gradient(135deg, rgba(91,184,232,0.09), rgba(7,27,51,0.9)); }
.tool-card > span { display: block; margin-bottom: 14px; color: var(--cyan); font-size: 0.66rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; }
.tool-card h3 { margin-bottom: 12px; color: #fff; font-size: 1.05rem; }
.tool-card p { margin-bottom: 0; color: var(--dark-body); font-size: 0.82rem; }
.tool-green { border-color: rgba(33,181,115,0.22); background: linear-gradient(135deg, rgba(33,181,115,0.1), rgba(7,27,51,0.9)); }
.tool-green > span { color: var(--green); }
.tool-amber { border-color: rgba(242,179,44,0.22); background: linear-gradient(135deg, rgba(242,179,44,0.1), rgba(7,27,51,0.9)); }
.tool-amber > span { color: var(--orange); }
.tool-purple { border-color: rgba(159,140,245,0.22); background: linear-gradient(135deg, rgba(159,140,245,0.1), rgba(7,27,51,0.9)); }
.tool-purple > span { color: var(--purple); }

.current-notice { padding: 64px 0; background: #fff; }
.current-notice .eyebrow { color: var(--green-dark); }
.current-notice h2 { color: var(--ink); font-size: 2.4rem; }
.current-notice p { color: var(--muted); }
.operator-proof { background: var(--canvas); }
.operator-proof .product-grid { grid-template-columns: 0.8fr 1.2fr; gap: 72px; }
.operator-proof .product-copy h2 { color: var(--ink); font-size: 2.8rem; }
.operator-proof .product-copy > p { color: var(--muted); }
.check-list { display: grid; gap: 12px; margin: 28px 0 30px; padding: 0; list-style: none; }
.check-list li { position: relative; padding-left: 30px; color: var(--ink); font-size: 0.86rem; font-weight: 600; }
.check-list li::before { content: "+"; position: absolute; left: 0; top: 1px; display: grid; width: 20px; height: 20px; place-items: center; border-radius: 50%; background: var(--green); color: var(--navy); font-weight: 800; }
.product-proof-media { margin: 0; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow); }
.product-proof-media img { width: 100%; }
.product-proof-media figcaption { padding: 12px 16px; color: var(--muted); font-size: 0.72rem; }
.exam-paths { background: #fff; }
.exam-paths .card { border-top: 4px solid var(--green); }
.exam-paths .card:nth-child(2) { border-top-color: var(--cyan); }
.exam-paths .card:nth-child(3) { border-top-color: var(--orange); }
.free-band { background: var(--canvas); }
.sample-links { overflow: hidden; border-radius: var(--radius); }
.sample-links a:hover { background: #e8f7f0; }
.resource-band { background: var(--canvas); }
.final-cta { background: radial-gradient(ellipse 55% 85% at 50% 100%, rgba(33,181,115,0.18), transparent 70%), var(--navy); color: #fff; }
.final-cta .shell { max-width: 860px; }
.final-cta .eyebrow { color: var(--green); }
.final-cta h2 { color: #fff; font-size: 3rem; font-weight: 800; }
.final-cta p { color: var(--dark-body); }

.style-guide-hero { padding: 84px 0; background: var(--navy); color: #fff; text-align: center; }
.style-guide-hero .shell { max-width: 860px; }
.style-guide-hero h1 { margin: 24px 0 20px; font-size: 4rem; font-weight: 900; }
.style-guide-hero p { margin-bottom: 0; color: var(--dark-body); font-size: 1.05rem; }
.style-guide-nav { display: flex; gap: 8px; overflow-x: auto; padding-top: 18px; padding-bottom: 18px; white-space: nowrap; }
.style-guide-nav a { padding: 8px 12px; border-radius: 9999px; color: var(--ink); font-size: 0.76rem; font-weight: 600; text-decoration: none; }
.style-guide-nav a:hover { background: var(--mist); }
.style-section { padding: 82px 0; }
.style-section-light { background: var(--canvas); }
.style-section-dark { background: var(--navy); color: #fff; }
.style-section > .shell > h2 { margin-bottom: 12px; font-size: 2.35rem; }
.style-section > .shell > p { max-width: 760px; margin-bottom: 36px; color: var(--muted); }
.style-section-dark > .shell > p { color: var(--dark-body); }
.swatch-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.swatch-card { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.swatch-card .swatch { display: block; height: 96px; }
.swatch-card strong, .swatch-card code, .swatch-card p { display: block; margin: 0 16px; }
.swatch-card strong { margin-top: 14px; font-family: var(--serif); font-size: 0.85rem; }
.swatch-card code { color: var(--muted); font-size: 0.72rem; }
.swatch-card p { margin-top: 8px; margin-bottom: 16px; color: var(--muted); font-size: 0.72rem; }
.swatch-navy { background: #071b33; }
.swatch-surface { background: #0c2440; }
.swatch-green { background: #21b573; }
.swatch-green-hover { background: #1a9d63; }
.swatch-light { background: #f6f9fb; }
.swatch-white { background: #fff; border-bottom: 1px solid var(--line); }
.swatch-border { background: #e3eaf1; }
.swatch-muted { background: #5c6b7e; }
.style-note { margin-top: 26px; padding: 22px 24px; border-left: 4px solid var(--green); border-radius: var(--radius); background: var(--canvas); }
.style-note p { margin: 6px 0 0; color: var(--muted); font-size: 0.82rem; }
.accent-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.accent-card { display: grid; grid-template-columns: 42px 1fr; align-items: center; gap: 2px 12px; padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
.accent-card span { grid-row: 1 / 3; width: 42px; height: 42px; border-radius: var(--radius); }
.accent-card strong { font-family: var(--serif); font-size: 0.8rem; }
.accent-card code { color: var(--muted); font-size: 0.7rem; }
.accent-green span { background: var(--green); }
.accent-cyan span { background: var(--cyan); }
.accent-amber span { background: var(--orange); }
.accent-purple span { background: var(--purple); }
.type-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.type-grid article { min-height: 150px; padding: 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.type-grid article:nth-child(2n) { border-right: 0; }
.type-grid article:nth-last-child(-n + 2) { border-bottom: 0; }
.type-grid article > span { display: block; margin-bottom: 18px; color: var(--muted); font-size: 0.68rem; }
.type-hero { font-family: var(--serif); font-size: 2.5rem; font-weight: 900; }
.type-display { font-family: var(--serif); font-size: 2rem; font-weight: 800; }
.type-card { font-family: var(--serif); font-size: 1.2rem; font-weight: 700; }
.type-stat { color: var(--green-dark); font-family: var(--serif); font-size: 3rem; font-weight: 800; }
.component-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; }
.style-card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.style-card-grid .tool-card { max-width: none; }
.rhythm-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.rhythm-grid span { padding: 22px 12px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; color: var(--green-dark); font-family: var(--serif); font-size: 1.2rem; font-weight: 800; text-align: center; }
.rhythm-grid small { color: var(--muted); font-family: var(--sans); font-size: 0.68rem; font-weight: 500; }
.voice-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.voice-grid article { padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); }
.voice-grid article:first-child { border-top: 4px solid var(--green); }
.voice-grid article:last-child { border-top: 4px solid var(--orange); }
.voice-grid strong { font-family: var(--serif); font-size: 1.1rem; }
.voice-grid ul { margin-bottom: 0; padding-left: 20px; color: var(--muted); }
.style-section pre { overflow-x: auto; margin: 0; padding: 28px; border: 1px solid #29445f; border-radius: var(--radius); background: var(--footer); color: #d7e2ec; font: 0.8rem/1.7 "IBM Plex Mono", Consolas, monospace; }

.research-hub, .research-page { background: var(--canvas); }
.research-hub-hero, .research-hero { background: var(--navy); color: #fff; }
.research-hub-hero { padding: 84px 0 88px; }
.research-hub-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 90px; align-items: end; }
.research-hub-grid h1 { max-width: 920px; margin: 18px 0 22px; color: #fff; font-size: 4rem; line-height: 1.02; }
.research-hub-grid > div > p { max-width: 780px; margin: 0; color: var(--dark-body); font-size: 1.02rem; }
.research-hub-grid > aside { display: grid; grid-template-columns: auto 1fr; gap: 8px 16px; align-items: baseline; padding-left: 30px; border-left: 1px solid #31506e; }
.research-hub-grid > aside strong { color: var(--green); font-family: var(--serif); font-size: 2.3rem; line-height: 1; }
.research-hub-grid > aside span { color: var(--dark-body); font-size: 0.74rem; }
.research-jump { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: -1px; padding: 0; background: #fff; border: 1px solid var(--line); }
.research-jump a { min-width: 0; padding: 20px; border-right: 1px solid var(--line); color: var(--ink); font-family: var(--serif); font-size: 0.78rem; font-weight: 700; text-decoration: none; }
.research-jump a:last-child { border-right: 0; }
.research-jump a:hover { background: var(--mist); color: var(--green-dark); }
.research-overview { padding: 20px 0 76px; }
.research-overview .research-chart { margin-bottom: 20px; }
.research-overview .research-table { margin: 0; }
.research-method { padding: 76px 0; background: #fff; }
.research-method-grid { display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 86px; align-items: start; }
.research-method h2 { max-width: 500px; margin-top: 14px; font-size: 2.5rem; }
.research-method ol { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin: 0; padding: 0; list-style: none; }
.research-method li { min-width: 0; padding: 0 22px; border-left: 1px solid var(--line); }
.research-method li strong, .research-method li span { display: block; }
.research-method li strong { margin-bottom: 10px; color: var(--ink); font-family: var(--serif); font-size: 0.84rem; }
.research-method li span { color: var(--muted); font-size: 0.73rem; }
.research-collection { padding: 82px 0; border-top: 1px solid var(--line); }
.research-collection:nth-of-type(even) { background: #fff; }
.research-collection-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: end; margin-bottom: 34px; }
.research-collection-heading h2 { margin-top: 10px; font-size: 2.5rem; }
.research-collection-heading > p { max-width: 520px; margin: 0; color: var(--muted); }
.research-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.research-card { display: flex; min-width: 0; min-height: 380px; flex-direction: column; padding: 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
.research-collection:nth-of-type(even) .research-card { background: var(--canvas); }
.research-card-top { display: flex; min-height: 48px; align-items: start; justify-content: space-between; gap: 12px; }
.research-number { color: var(--green-dark); font-family: var(--serif); font-size: 1.35rem; font-weight: 800; }
.research-card-metric { max-width: 150px; color: var(--muted); font-size: 0.61rem; line-height: 1.35; text-align: right; }
.research-card-metric strong { display: block; color: var(--green-dark); font-family: var(--serif); font-size: 1rem; }
.research-card h3 { margin: 22px 0 14px; font-size: 1.32rem; line-height: 1.25; }
.research-card p { display: -webkit-box; margin-bottom: 24px; overflow: hidden; color: var(--muted); font-size: 0.78rem; -webkit-box-orient: vertical; -webkit-line-clamp: 6; }
.research-card .text-link { margin-top: auto; }
.research-hero { padding: 66px 0 74px; }
.research-hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) 290px; gap: 86px; align-items: end; }
.research-kicker { display: flex; gap: 10px; align-items: center; color: var(--green); font-size: 0.68rem; font-weight: 700; text-transform: uppercase; }
.research-kicker span + span::before { content: "/"; margin-right: 10px; color: #607c98; }
.research-hero h1 { max-width: 920px; margin: 18px 0 22px; color: #fff; font-size: 3.6rem; line-height: 1.04; }
.research-hero-grid > div > p { max-width: 860px; color: var(--dark-body); font-size: 1.02rem; }
.research-hero .reviewed { color: #9eb2c5; }
.research-hero .reviewed a { color: #fff; }
.research-hero-grid > aside { padding: 24px; border-top: 4px solid var(--green); background: rgba(255,255,255,0.07); }
.research-metrics { display: grid; gap: 18px; }
.research-metrics > div { padding-bottom: 18px; border-bottom: 1px solid #31506e; }
.research-metrics > div:last-child { padding-bottom: 0; border-bottom: 0; }
.research-metrics strong, .research-metrics span { display: block; }
.research-metrics strong { color: #fff; font-family: var(--serif); font-size: 1.55rem; line-height: 1.1; }
.research-metrics span { margin-top: 5px; color: var(--dark-body); font-size: 0.68rem; line-height: 1.35; }
.research-evidence { padding: 38px 0; border-bottom: 1px solid var(--line); background: #fff; }
.research-evidence > .shell { display: grid; grid-template-columns: 0.75fr 1.25fr; gap: 70px; align-items: center; }
.research-evidence h2 { margin: 8px 0 0; font-size: 1.7rem; }
.research-evidence ul { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); margin: 0; padding: 0; list-style: none; }
.research-evidence li { min-width: 0; padding: 12px 20px; border-left: 1px solid var(--line); color: var(--ink); font-size: 0.75rem; font-weight: 600; }
.research-layout { display: grid; grid-template-columns: minmax(0, 1fr) 290px; gap: 76px; padding-top: 76px; padding-bottom: 58px; }
.research-copy { min-width: 0; }
.research-data, .research-conclusion { min-width: 0; }
.research-data { padding-bottom: 10px; }
.research-conclusion { padding-bottom: 58px; }
.research-section { display: grid; grid-template-columns: 52px minmax(0, 1fr); gap: 24px; padding: 0 0 42px; margin-bottom: 42px; border-bottom: 1px solid var(--line); }
.research-section > span { color: var(--green-dark); font-family: var(--serif); font-size: 1.1rem; font-weight: 800; }
.research-section h2 { margin-bottom: 15px; font-size: 2rem; }
.research-section p { max-width: 760px; margin: 0; color: var(--muted); font-size: 0.91rem; }
.research-chart { margin: 56px 0; border: 1px solid var(--line); background: #fff; }
.research-chart-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 42px; align-items: end; padding: 30px; border-bottom: 1px solid var(--line); }
.research-chart-heading h2 { margin: 10px 0 0; font-size: 1.9rem; }
.research-chart-heading p { margin: 0; color: var(--muted); font-size: 0.78rem; }
.data-chart { padding: 0 30px; }
.data-chart-row { display: grid; grid-template-columns: minmax(180px, 0.8fr) minmax(300px, 1.2fr); gap: 30px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.data-chart-row:last-child { border-bottom: 0; }
.data-chart-label strong, .data-chart-label span { display: block; }
.data-chart-label strong { color: var(--ink); font-family: var(--serif); font-size: 0.78rem; line-height: 1.35; }
.data-chart-label span { margin-top: 5px; color: var(--muted); font-size: 0.65rem; line-height: 1.4; }
.data-chart-series { display: grid; gap: 8px; align-content: center; }
.data-series { display: grid; grid-template-columns: 96px minmax(80px, 1fr) 58px; gap: 10px; align-items: center; }
.data-series > span { color: var(--muted); font-size: 0.62rem; }
.data-series > strong { color: var(--ink); font-family: var(--serif); font-size: 0.72rem; text-align: right; }
.data-bar-track { height: 10px; overflow: hidden; background: #e7edf2; }
.data-bar { display: block; width: var(--data-bar); height: 100%; }
.data-bar-green { background: var(--green); }
.data-bar-cyan { background: var(--cyan); }
.data-bar-amber { background: var(--orange); }
.research-chart figcaption { padding: 12px 30px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.62rem; }
.research-table { margin: 56px 0; border: 1px solid var(--line); background: #fff; }
.research-table summary { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 22px 26px; color: var(--ink); cursor: pointer; font-family: var(--serif); font-size: 1rem; font-weight: 700; }
.research-table summary strong { color: var(--green-dark); font-family: var(--sans); font-size: 0.64rem; text-transform: uppercase; }
.research-table > p { margin: 0; padding: 0 26px 22px; color: var(--muted); font-size: 0.74rem; }
.data-table-wrap { max-height: 620px; overflow: auto; border-top: 1px solid var(--line); }
.data-table-wrap table { width: 100%; border-collapse: collapse; font-size: 0.68rem; }
.data-table-wrap th, .data-table-wrap td { padding: 11px 13px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; white-space: nowrap; }
.data-table-wrap th:last-child, .data-table-wrap td:last-child { border-right: 0; }
.data-table-wrap th { position: sticky; z-index: 1; top: 0; background: var(--navy); color: #fff; font-size: 0.6rem; text-transform: uppercase; }
.data-table-wrap tbody tr:nth-child(even) { background: #f7f9fb; }
.research-limit { margin: 56px 0; padding: 30px 34px; border-left: 4px solid var(--orange); background: #fff4e3; }
.research-limit > span { color: #8a5708; font-size: 0.66rem; font-weight: 700; text-transform: uppercase; }
.research-limit h2 { margin: 9px 0 12px; font-size: 1.65rem; }
.research-limit p { margin: 0; color: #685537; font-size: 0.82rem; }
.research-action { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: end; padding: 40px; background: #e8f7f0; }
.research-action h2 { margin: 10px 0 12px; font-size: 1.85rem; }
.research-action p { max-width: 700px; margin: 0; color: var(--muted); font-size: 0.8rem; }
.research-action .button { white-space: nowrap; }
.research-aside { display: flex; min-width: 0; flex-direction: column; gap: 18px; }
.research-aside nav, .research-aside > div { padding: 22px; border-top: 3px solid var(--green); background: #fff; }
.research-aside nav > strong, .research-aside > div > strong { display: block; margin-bottom: 14px; font-family: var(--serif); font-size: 0.85rem; }
.research-aside nav a { display: grid; grid-template-columns: 28px minmax(0, 1fr); gap: 8px; padding: 12px 0; border-top: 1px solid var(--line); color: var(--ink); font-size: 0.7rem; font-weight: 600; text-decoration: none; }
.research-aside nav a span { color: var(--green-dark); }
.research-aside p { color: var(--muted); font-size: 0.7rem; }
.research-aside > div > a { color: var(--green-dark); font-size: 0.72rem; font-weight: 700; }
.research-pager { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); padding-bottom: 82px; }
.research-pager a { display: flex; min-height: 110px; flex-direction: column; justify-content: center; padding: 24px 28px; border: 1px solid var(--line); color: var(--ink); font-family: var(--serif); font-size: 0.82rem; font-weight: 700; text-decoration: none; }
.research-pager a + a { border-left: 0; text-align: right; }
.research-pager a span { margin-bottom: 6px; color: var(--green-dark); font-family: var(--sans); font-size: 0.63rem; text-transform: uppercase; }
.research-pager a:hover { background: #fff; }

@media (max-width: 980px) {
  .nav-row { grid-template-columns: auto auto 1fr; }
  .nav-toggle { display: grid; width: 42px; height: 42px; place-content: center; gap: 4px; border: 1px solid var(--line); border-radius: 4px; background: var(--paper); cursor: pointer; }
  .nav-toggle span:not(.sr-only) { width: 20px; height: 2px; background: var(--ink); }
  .primary-nav { display: none; position: absolute; left: 0; right: 0; top: 78px; padding: 14px 20px 22px; background: var(--paper); border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
  .primary-nav.is-open { display: grid; }
  .primary-nav a { padding: 10px; color: var(--ink); }
  .nav-cta { justify-self: end; }
  .hero-grid, .product-grid, .article-hero-grid, .quiz-intro-grid { gap: 42px; }
  .hero-grid { grid-template-columns: 1fr; }
  .home-hero { max-height: none; }
  .product-stage { max-width: 760px; }
  .card-grid.three { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: 1fr; }
  .operator-proof .product-grid { grid-template-columns: 1fr; }
  .tool-grid, .swatch-grid, .accent-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rhythm-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .media-stack { max-width: 760px; min-height: 520px; }
  .free-grid { grid-template-columns: 1fr; gap: 34px; }
  .plan-grid { grid-template-columns: 1fr; max-width: 700px; }
  .plan > p { min-height: 0; }
  .article-layout { grid-template-columns: 1fr; gap: 48px; }
  .article-aside > div { position: static; }
  .article-aside { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
  .domain-hero-grid, .topic-hero-grid { gap: 42px; }
  .domain-layout { grid-template-columns: 200px minmax(0, 1fr); gap: 36px; }
  .topic-layout, .question-guide-layout { grid-template-columns: minmax(0, 1fr) 280px; gap: 42px; }
  .related-lessons > div { grid-template-columns: 1fr; }
  .related-lessons > div > a { border-right: 0; border-bottom: 1px solid var(--line); }
  .related-lessons > div > a:last-child { border-bottom: 0; }
  .footer-grid { grid-template-columns: 1.5fr repeat(3, 1fr); gap: 30px; }
  .research-hub-grid, .research-hero-grid { grid-template-columns: minmax(0, 1fr) 240px; gap: 48px; }
  .research-hub-grid h1 { font-size: 3.3rem; }
  .research-method-grid, .research-collection-heading { gap: 46px; }
  .research-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .research-layout { grid-template-columns: minmax(0, 1fr) 240px; gap: 42px; }
  .research-evidence > .shell { gap: 36px; }
  .research-chart-heading, .research-action { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .shell { width: min(100% - 28px, 1180px); }
  .section { padding: 70px 0; }
  .utility-inner { min-height: 40px; font-size: 0.68rem; }
  .utility-inner span { display: none; }
  .nav-row { min-height: 68px; grid-template-columns: auto auto; gap: 10px; }
  .brand strong { font-size: 0.8rem; }
  .nav-toggle { justify-self: end; }
  .nav-cta { display: none; }
  .primary-nav { top: 68px; }
  .hero-grid { padding-top: 50px; padding-bottom: 46px; }
  .home-hero { min-height: auto; }
  .home-hero .hero-grid { gap: 18px; padding-top: 32px; padding-bottom: 18px; }
  .hero-copy h1 { margin: 9px 0 14px; font-size: 2.65rem; line-height: 1; }
  .hero-copy > p { margin-bottom: 0; font-size: 0.9rem; line-height: 1.55; }
  .hero-copy .button-row { display: grid; grid-template-columns: 1.25fr 0.75fr; gap: 8px; margin: 18px 0 0; }
  .hero-copy .button { width: auto; min-height: 44px; padding: 8px 9px; font-size: 0.72rem; }
  .hero-facts { display: none; }
  .product-stage { height: 174px; padding: 0 0 18px 10px; overflow: hidden; }
  .product-stage::before { inset: 16px -20vw 0 18%; }
  .product-stage > img { height: 156px; object-fit: cover; object-position: top; }
  .product-label { display: none; }
  .result-chip { right: 0; bottom: 2px; max-width: 220px; padding: 9px 11px; }
  .result-chip strong { font-size: 0.78rem; }
  .result-chip span { font-size: 0.62rem; }
  .fact-grid { grid-template-columns: repeat(2, 1fr); }
  .fact-grid > div { padding: 18px; border-bottom: 1px solid #31505e; }
  .fact-grid > div:nth-child(2) { border-right: 0; }
  .fact-grid strong { font-size: 1.5rem; }
  .notice-row, .split-heading { align-items: start; flex-direction: column; gap: 24px; }
  .notice-row .button { width: 100%; }
  .card-grid.three, .sample-links { grid-template-columns: 1fr; }
  .card-grid.two { grid-template-columns: 1fr; }
  .card { padding: 24px; }
  .steps li { grid-template-columns: 28px 80px 1fr; gap: 8px; }
  .media-stack { min-height: 390px; }
  .sample-links a { border-right: 0; border-bottom: 1px solid var(--line); }
  .sample-links a:last-child { border-bottom: 0; }
  .article-hero { padding: 50px 0 58px; }
  .article-hero-grid, .quiz-intro-grid { grid-template-columns: 1fr; }
  .article-hero h1 { font-size: 2.65rem; }
  .answer-box { padding: 22px; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .stat-grid > div:nth-child(2) { border-right: 0; }
  .stat-grid > div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .article-layout { padding-top: 60px; padding-bottom: 70px; }
  .article-section { grid-template-columns: 1fr; gap: 8px; }
  .article-aside { grid-template-columns: 1fr; }
  .encyclopedia-jump { grid-template-columns: 1fr; margin-top: 0; }
  .encyclopedia-jump a { border-right: 0; border-bottom: 1px solid var(--line); }
  .encyclopedia-jump a:last-child { border-bottom: 0; }
  .evidence-grid, .domain-hero-grid, .domain-layout, .conversion-grid, .topic-hero-grid, .topic-layout, .question-guide-layout { grid-template-columns: 1fr; }
  .domain-hero, .topic-hero, .question-guide-hero { padding: 48px 0 54px; }
  .domain-hero h1, .topic-hero h1, .question-guide-hero h1 { font-size: 2.65rem; }
  .weight-box { max-width: 100%; }
  .domain-nav { order: 2; }
  .lesson-heading h2, .conversion-grid h2, .topic-content > section > h2, .answer-explanation h2, .study-transfer h2 { font-size: 2rem; }
  .conversion-grid .button-row { width: 100%; }
  .conversion-grid .button { width: 100%; }
  .topic-meta { grid-template-columns: 1fr; }
  .topic-meta > div { border-right: 0; border-bottom: 1px solid var(--line); }
  .topic-meta > div:last-child { border-bottom: 0; }
  .topic-layout, .question-guide-layout { gap: 46px; padding-top: 54px; padding-bottom: 72px; }
  .scenario-panel, .trap-panel, .question-paper { padding: 24px 20px; }
  .study-loop { grid-template-columns: 1fr; }
  .study-loop li { border-right: 0; border-bottom: 1px solid var(--line); }
  .study-loop li:last-child { border-bottom: 0; }
  .topic-aside > div { position: static; }
  .question-paper li { grid-template-columns: 30px minmax(0, 1fr); }
  .question-paper li > strong { grid-column: 2; }
  .listing-hero .shell, .pricing-hero .shell { margin-inline: auto; }
  .listing-hero h1, .pricing-hero h1 { font-size: 2.65rem; overflow-wrap: anywhere; }
  .guarantee-grid { grid-template-columns: 1fr; gap: 40px; }
  .seal { width: 200px; }
  .prose-media { grid-template-columns: 1fr; gap: 34px; }
  .contact-grid { grid-template-columns: 1fr; }
  .quiz-intro { padding: 52px 0; }
  .quiz-page .quiz-intro { padding: 34px 0 38px; }
  .quiz-page .quiz-intro-grid { gap: 18px; }
  .quiz-page .quiz-intro h1 { margin: 8px 0 14px; font-size: 2.6rem; }
  .quiz-page .quiz-intro p { margin-bottom: 0; font-size: 0.88rem; }
  .quiz-page .quiz-intro ul { display: none; }
  .quiz-page .quiz-source { padding: 0; border: 0; }
  .quiz-page .quiz-source strong, .quiz-page .quiz-source p { display: none; }
  .quiz-page .quiz-source a { font-size: 0.75rem; }
  .quiz-page .quiz-section { padding: 30px 0 70px; }
  .quiz-top { grid-template-columns: 1fr; gap: 8px; }
  .question-panel, .results { padding: 24px 18px; }
  .question-heading { align-items: start; flex-direction: column; gap: 6px; }
  .answer-option { grid-template-columns: 30px 1fr; padding: 13px 12px; }
  .quiz-controls .button { min-width: 0; flex: 1; padding-inline: 12px; }
  .results-header { grid-template-columns: 1fr; }
  .score-ring { width: 150px; }
  .part-results, .study-plan ol { grid-template-columns: 1fr; }
  .result-actions .button { width: 100%; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
  .legal { flex-direction: column; }
  .operator-hero { padding-top: 58px; padding-bottom: 58px; }
  .operator-hero h1 { margin-top: 20px; font-size: 3rem; }
  .operator-hero .hero-copy > p { font-size: 0.92rem; }
  .operator-hero .button-row { display: grid; grid-template-columns: 1fr; margin-top: 24px; }
  .operator-hero .button { width: 100%; }
  .operator-stats { margin-top: 44px; }
  .operator-stats > div { padding-inline: 10px; }
  .operator-stats strong { font-size: 2rem; }
  .operator-stats span { font-size: 0.62rem; }
  .tool-grid, .swatch-grid, .accent-grid, .type-grid, .style-card-grid, .voice-grid { grid-template-columns: 1fr; }
  .tool-card { min-height: 0; }
  .operator-tools .section-title-block h2, .current-notice h2, .operator-proof .product-copy h2, .final-cta h2 { font-size: 2.15rem; }
  .type-grid article { border-right: 0; }
  .type-grid article:nth-last-child(-n + 2) { border-bottom: 1px solid var(--line); }
  .type-grid article:last-child { border-bottom: 0; }
  .rhythm-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .style-guide-hero { padding: 58px 0; }
  .style-guide-hero h1 { font-size: 2.65rem; }
  .style-section { padding: 64px 0; }
  .research-hub-hero { padding: 54px 0 58px; }
  .research-hub-grid, .research-hero-grid, .research-method-grid, .research-collection-heading, .research-layout, .research-evidence > .shell { grid-template-columns: 1fr; }
  .research-hub-grid { gap: 38px; }
  .research-hub-grid h1, .research-hero h1 { font-size: 2.55rem; overflow-wrap: anywhere; }
  .research-hub-grid > aside { grid-template-columns: 82px 1fr; padding-left: 0; padding-top: 24px; border-left: 0; border-top: 1px solid #31506e; }
  .research-jump { grid-template-columns: 1fr; }
  .research-jump a { border-right: 0; border-bottom: 1px solid var(--line); }
  .research-jump a:last-child { border-bottom: 0; }
  .research-method { padding: 58px 0; }
  .research-method ol { grid-template-columns: 1fr; }
  .research-method li { padding: 18px 0; border-left: 0; border-top: 1px solid var(--line); }
  .research-collection { padding: 62px 0; }
  .research-collection-heading { gap: 16px; }
  .research-grid { grid-template-columns: 1fr; }
  .research-card { min-height: 340px; }
  .research-hero { padding: 48px 0 54px; }
  .research-hero-grid { gap: 34px; }
  .research-evidence ul { grid-template-columns: 1fr; }
  .research-evidence li { border-left: 0; border-top: 1px solid var(--line); padding-inline: 0; }
  .research-layout { gap: 44px; padding-top: 54px; }
  .research-section { grid-template-columns: 38px minmax(0, 1fr); gap: 10px; }
  .research-section h2 { font-size: 1.65rem; }
  .research-chart-heading { grid-template-columns: 1fr; gap: 14px; padding: 24px 20px; }
  .data-chart { padding: 0 20px; }
  .data-chart-row { grid-template-columns: 1fr; gap: 14px; }
  .data-series { grid-template-columns: 82px minmax(70px, 1fr) 54px; }
  .research-chart figcaption { padding-inline: 20px; }
  .research-table summary { align-items: start; padding: 20px; }
  .research-table > p { padding: 0 20px 20px; }
  .research-action { padding: 28px 22px; }
  .research-action .button { width: 100%; white-space: normal; }
  .research-pager { grid-template-columns: 1fr; }
  .research-pager a + a { border-left: 1px solid var(--line); border-top: 0; text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}