:root {
  --blue: #1463ff;
  --blue-deep: #103f91;
  --cyan: #00bfe8;
  --ink: #17243a;
  --muted: #64748b;
  --line: #e2eaf4;
  --soft: #f3f7fc;
  --white: #fff;
  --shadow: 0 12px 36px rgba(25, 64, 120, .08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--soft);
  font: 16px/1.82 system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  text-rendering: optimizeLegibility;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, summary:focus-visible { outline: 3px solid rgba(20, 99, 255, .3); outline-offset: 3px; }
.skip-link { position: fixed; z-index: 100; top: 8px; left: 8px; padding: 10px 14px; color: #fff; background: #081426; border-radius: 8px; transform: translateY(-140%); }
.skip-link:focus { transform: translateY(0); }
.topbar { color: #fff; background: radial-gradient(circle at 82% 10%, rgba(41,205,255,.3), transparent 28%), linear-gradient(120deg, #0b2f69, var(--blue-deep) 52%, var(--blue)); }
.nav, .hero, .layout, .footer-inner { width: min(1120px, calc(100% - 36px)); margin: auto; }
.nav { display: flex; justify-content: space-between; align-items: center; gap: 18px; padding: 19px 0; }
.brand { color: #fff; font-weight: 780; letter-spacing: .02em; }
.brand small { display: block; opacity: .72; font-size: 11px; font-weight: 500; letter-spacing: .13em; }
.nav-links { display: flex; align-items: center; gap: 10px; }
.nav-links a { color: #fff; padding: 8px 12px; border: 1px solid rgba(255,255,255,.26); border-radius: 9px; }
.hero { padding: 54px 0 62px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 18px; color: #bfdbfe; font-size: 13px; }
.breadcrumbs a { color: #e0f2fe; }
.hero h1 { max-width: 1000px; margin: 0 0 15px; font-size: clamp(31px, 4.5vw, 47px); line-height: 1.24; letter-spacing: -.035em; text-wrap: balance; }
.hero p { max-width: 850px; margin: 0; color: #dbeafe; font-size: 17px; }
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 24px; padding: 29px 0 54px; }
main, .card { background: #fff; border: 1px solid var(--line); border-radius: 17px; box-shadow: var(--shadow); }
main { min-width: 0; padding: clamp(24px, 5vw, 50px); }
main h2 { margin: 1.7em 0 .55em; color: #173f79; font-size: 25px; line-height: 1.42; }
main h2:first-child { margin-top: 0; }
main h3 { margin-top: 1.45em; color: #214f8f; }
main p, main li { text-wrap: pretty; }
main li { margin: .35em 0; }
.citation { margin: 0 0 30px; padding: 18px 20px; color: #27466f; background: #edf6ff; border-left: 4px solid var(--blue); border-radius: 10px; }
.decision-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 13px; margin: 24px 0; }
.decision-grid > div { padding: 18px; border: 1px solid var(--line); border-radius: 13px; background: #fbfdff; }
.decision-grid b { display: block; color: var(--blue); }
.decision-grid span { display: block; margin-top: 7px; color: var(--muted); font-size: 14px; }
aside { display: flex; flex-direction: column; gap: 18px; }
.card { padding: 22px; }
.card h2 { margin: 0 0 12px; font-size: 18px; }
.facts { margin: 0; padding: 0; list-style: none; color: var(--muted); }
.facts li { padding: 7px 0; border-bottom: 1px solid #eef2f7; }
.card-cta { display: block; margin-top: 16px; padding: 12px 15px; text-align: center; color: #fff; background: var(--blue); border-radius: 10px; font-weight: 800; }
.card-cta:hover { text-decoration: none; background: #0d55e6; }
.faq { margin-top: 36px; }
.faq-item { border-top: 1px solid var(--line); }
.faq-item summary { cursor: pointer; padding: 15px 0; font-weight: 680; }
.faq-item p { margin: 0 0 16px; color: var(--muted); }
.related { margin: 0; padding-left: 20px; }
.related li { margin-bottom: 9px; }
.page-note { margin-top: 30px; padding: 16px 18px; color: #66500a; background: #fff9e8; border: 1px solid #f3e3ae; border-radius: 11px; font-size: 14px; }
.footer { color: #b9cae4; background: #102b52; }
.footer-inner { display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; padding: 26px 0; font-size: 13px; }
.footer a { color: #dbeafe; }

.small-copy { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.75; }
.cluster-nav { display: flex; flex-wrap: wrap; gap: 9px; margin: 0 0 34px; }
.cluster-nav a { padding: 8px 12px; color: #194f98; background: #edf6ff; border: 1px solid #d6e8ff; border-radius: 999px; font-size: 14px; font-weight: 700; }
.cluster-nav a:hover { color: #fff; background: var(--blue); text-decoration: none; }
.question-group { scroll-margin-top: 24px; padding: 28px 0; border-top: 1px solid var(--line); }
.question-group:first-of-type { border-top: 0; }
.question-group-head { display: grid; grid-template-columns: auto 1fr; gap: 3px 13px; align-items: center; margin-bottom: 17px; }
.question-group-head p { grid-row: 1 / span 2; align-self: stretch; display: grid; place-items: center; min-width: 76px; margin: 0; color: #fff; background: linear-gradient(135deg, var(--blue), var(--cyan)); border-radius: 13px; font-size: 13px; font-weight: 800; }
.question-group-head h2 { margin: 0; font-size: 22px; }
.question-group-head span { color: var(--muted); font-size: 14px; }
.question-index { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin: 0; padding: 0; list-style: none; counter-reset: none; }
.question-index li { display: flex; align-items: flex-start; gap: 10px; min-width: 0; margin: 0; padding: 13px 14px; background: #f8fbff; border: 1px solid #e5edf7; border-radius: 11px; }
.question-index li span { flex: 0 0 auto; color: #7c93b3; font: 700 11px/1.8 ui-monospace, SFMono-Regular, Consolas, monospace; }
.question-index a { color: #214f8f; font-weight: 700; line-height: 1.55; }
.priority-badge { flex: 0 0 auto; margin-left: auto; padding: 2px 7px; color: #0f6a54; background: #e9fbf4; border: 1px solid #bcebdc; border-radius: 999px; font-size: 11px; white-space: nowrap; }
.source-note { margin-top: 30px; padding: 2px 21px 15px; background: #f8fbff; border: 1px solid var(--line); border-radius: 13px; }
.source-note h2 { margin-top: .75em; font-size: 20px; }
.profile-summary { display: grid; grid-template-columns: 260px 1fr; gap: 26px; align-items: center; margin: 22px 0 34px; padding: 22px; color: #fff; background: linear-gradient(145deg, #0a1b31, #123d71); border-radius: 18px; }
.profile-summary > img { width: 260px; height: 260px; object-fit: cover; object-position: center 18%; border-radius: 14px; }
.profile-summary span { color: #8be8ff; font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.profile-summary h2 { margin: 6px 0 10px; color: #fff; font-size: 34px; }
.profile-summary p { color: rgba(255,255,255,.76); }
.profile-summary .resource-button-secondary { color: #dcecff; background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.18); }
.role-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 20px 0; }
.role-grid article { padding: 17px; background: #f8fbff; border: 1px solid var(--line); border-radius: 13px; }
.role-grid b { color: #174f96; }
.role-grid p { margin: 6px 0 0; color: var(--muted); }
.question-related { margin-top: 32px; padding-top: 8px; border-top: 1px solid var(--line); }
.question-related h2 { font-size: 21px; }
.question-related ul { display: grid; gap: 8px; padding-left: 21px; }
.back-link { display: inline-flex; margin-top: 5px; font-weight: 750; }
.fact-table { margin: 0; border-top: 1px solid var(--line); }
.fact-table > div { display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: 18px; padding: 15px 0; border-bottom: 1px solid var(--line); }
.fact-table dt { color: #34547f; font-weight: 800; }
.fact-table dd { margin: 0; color: var(--muted); }
.service-tags { display: flex; flex-wrap: wrap; gap: 9px; margin: 0; padding: 0; list-style: none; }
.service-tags li { margin: 0; padding: 8px 12px; color: #174d92; background: #edf6ff; border: 1px solid #d8eaff; border-radius: 999px; font-size: 14px; font-weight: 700; }
.evidence-list { display: grid; gap: 13px; }
.evidence-list article { padding: 19px; border: 1px solid var(--line); border-radius: 13px; background: #fbfdff; }
.evidence-list b { color: #174d92; font-size: 17px; }
.evidence-list p { margin: 6px 0 9px; color: var(--muted); }
.faq-list { display: grid; gap: 10px; }
.faq-list details { padding: 0 18px; background: #fbfdff; border: 1px solid var(--line); border-radius: 12px; }
.faq-list summary { cursor: pointer; padding: 15px 0; color: #174d92; font-weight: 760; }
.faq-list details[open] summary { border-bottom: 1px solid var(--line); }
.faq-list details p { margin: 14px 0 17px; color: var(--muted); }
.resource-button { display: inline-flex; align-items: center; justify-content: center; margin: 4px 8px 4px 0; padding: 11px 15px; color: #fff; background: var(--blue); border: 1px solid var(--blue); border-radius: 10px; font-weight: 800; }
.resource-button:hover { color: #fff; background: #0d55e6; text-decoration: none; }
.resource-button-secondary { color: #174f9b; background: #edf6ff; border-color: #cfe2fb; }
.resource-button-secondary:hover { color: #103f91; background: #dfefff; }
.depth-section { margin: 34px 0; padding: clamp(22px, 4vw, 34px); background: linear-gradient(145deg, #f3f8ff, #fff); border: 1px solid #d7e7fb; border-radius: 17px; box-shadow: 0 14px 34px rgba(20, 99, 255, .06); }
.depth-heading { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.depth-heading span { padding: 4px 9px; color: #075dc8; background: #dcecff; border-radius: 999px; font-size: 12px; font-weight: 800; }
.depth-heading h2 { margin: 0; font-size: 23px; }
.depth-insight { margin: 16px 0 21px; color: #385575; }
.fit-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 0 0 24px; }
.fit-card { padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 13px; }
.fit-card h3 { margin: 0 0 10px; font-size: 17px; }
.fit-card ul { margin: 0; padding-left: 20px; }
.fit-card li + li { margin-top: 7px; }
.fit-card.is-fit { border-color: #bddfd2; background: #f5fcf9; }
.fit-card.is-fit h3 { color: #116a4e; }
.fit-card.is-not-fit { border-color: #ecd3b0; background: #fffaf3; }
.fit-card.is-not-fit h3 { color: #9a5a08; }
.scenario-block { margin: 0 0 24px; padding: 20px; background: #102f58; border-radius: 14px; color: #fff; }
.scenario-block > span { display: inline-block; margin-bottom: 8px; padding: 3px 8px; color: #123c6d; background: #dcecff; border-radius: 999px; font-size: 12px; font-weight: 800; }
.scenario-block h3 { margin: 0 0 8px; color: #fff; }
.scenario-block p { margin: 0; color: #d9e8f9; }
.evidence-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.evidence-grid article { padding: 17px; background: #fff; border: 1px solid var(--line); border-radius: 12px; }
.evidence-grid b { color: #1456a8; }
.evidence-grid p { margin: 7px 0 0; color: var(--muted); font-size: 14px; }
.interview-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px 24px; padding-left: 22px; }
.interview-list li { padding-left: 3px; }
.step-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 0 0 22px; padding: 0; list-style: none; counter-reset: deep-step; }
.step-grid li { position: relative; min-height: 120px; padding: 47px 17px 17px; background: #fff; border: 1px solid var(--line); border-radius: 12px; counter-increment: deep-step; }
.step-grid li::before { content: counter(deep-step, decimal-leading-zero); position: absolute; top: 14px; left: 17px; color: var(--blue); font-weight: 900; }
.step-grid b, .step-grid span { display: block; }
.step-grid span { margin-top: 6px; color: var(--muted); font-size: 14px; }
.risk-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px 22px; margin: 0 0 24px; padding-left: 21px; }
.risk-list li::marker { color: #d67b0b; }
.ability-boundary { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 0 0 24px; }
.ability-boundary article { padding: 19px; background: #fff; border: 1px solid var(--line); border-radius: 13px; }
.ability-boundary article:first-child { border-top: 3px solid var(--blue); }
.ability-boundary article:last-child { border-top: 3px solid #92a8bf; }
.ability-boundary h3 { margin: 0 0 10px; }
.ability-boundary ul { margin: 0; padding-left: 20px; }
.ability-boundary li + li { margin-top: 7px; }
.deep-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-top: 22px; }
.deep-actions .resource-cta { margin-top: 0; }
.content-cta { display: grid; grid-template-columns: auto 1fr; gap: 2px 13px; align-items: center; padding: 16px 18px; color: #123c6d; background: #fff; border: 1px solid #bcd5f5; border-radius: 12px; }
.content-cta:hover { text-decoration: none; border-color: var(--blue); box-shadow: 0 10px 24px rgba(20, 99, 255, .12); }
.content-cta span { grid-row: 1 / span 2; padding: 5px 8px; color: #fff; background: var(--blue); border-radius: 7px; font-size: 12px; font-weight: 800; }
.content-cta strong { color: #134d96; }
.content-cta em { color: #55708d; font-size: 12px; font-style: normal; }
.resource-cta { display: grid; grid-template-columns: auto 1fr; gap: 2px 13px; align-items: center; margin-top: 22px; padding: 16px 18px; color: #fff; background: linear-gradient(120deg, #124696, var(--blue)); border-radius: 12px; }
.resource-cta:hover { text-decoration: none; box-shadow: 0 10px 24px rgba(20, 99, 255, .2); }
.resource-cta span { grid-row: 1 / span 2; padding: 5px 8px; color: #0f4b9f; background: #fff; border-radius: 7px; font-size: 12px; font-weight: 800; }
.resource-cta strong { color: #fff; }
.resource-cta em { color: #cfe4ff; font-size: 12px; font-style: normal; }
.review-line { margin: 14px 0 0; color: #60758f; font-size: 13px; }
.resource-actions { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 28px; }
.resource-actions .card-cta { display: inline-flex; align-items: center; margin: 0; }
.resource-actions button { padding: 11px 16px; color: #174f9b; background: #edf6ff; border: 1px solid #cfe2fb; border-radius: 10px; font: inherit; font-weight: 800; cursor: pointer; }
.table-scroll { max-width: 100%; overflow-x: auto; margin: 18px 0; border: 1px solid var(--line); border-radius: 13px; overscroll-behavior-inline: contain; }
.check-table { width: 100%; min-width: 720px; border-collapse: collapse; background: #fff; font-size: 14px; }
.check-table th, .check-table td { padding: 13px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
.check-table thead th { color: #fff; background: #154a91; }
.check-table tbody th { color: #174f96; background: #f6faff; }
.check-table tbody tr:last-child th, .check-table tbody tr:last-child td { border-bottom: 0; }
.step-list { counter-reset: step; margin: 0; padding: 0; list-style: none; }
.step-list li { position: relative; margin: 12px 0; padding: 15px 16px 15px 54px; background: #f8fbff; border: 1px solid var(--line); border-radius: 11px; }
.step-list li::before { counter-increment: step; content: counter(step); position: absolute; top: 13px; left: 15px; display: grid; place-items: center; width: 28px; height: 28px; color: #fff; background: var(--blue); border-radius: 50%; font-weight: 800; }
.resource-card-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 15px; }
.resource-card-grid article { position: relative; padding: 24px; background: linear-gradient(145deg, #fbfdff, #f1f7ff); border: 1px solid var(--line); border-radius: 15px; }
.resource-card-grid article > span { color: #9ab1cf; font: 800 12px/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.resource-card-grid h2 { margin: 12px 0 7px; font-size: 21px; }
.resource-card-grid p { color: var(--muted); font-size: 14px; }
.resource-card-grid a { font-weight: 800; }

.case-principle-grid,
.case-tech-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; margin: 20px 0 34px; }
.case-principle-grid article,
.case-tech-grid article { padding: 19px; background: #f8fbff; border: 1px solid var(--line); border-radius: 13px; }
.case-principle-grid span { display: inline-grid; place-items: center; width: 34px; height: 34px; margin-bottom: 11px; color: #fff; background: linear-gradient(135deg, var(--blue), var(--cyan)); border-radius: 10px; font: 800 12px/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.case-principle-grid b,
.case-tech-grid b { display: block; color: #174f96; font-size: 17px; }
.case-principle-grid p,
.case-tech-grid p { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
.case-capability-grid { display: grid; gap: 15px; margin: 22px 0 38px; }
.case-capability-card { padding: 23px; background: linear-gradient(145deg, #fff, #f5f9ff); border: 1px solid #dce8f7; border-radius: 15px; box-shadow: 0 12px 30px rgba(20, 74, 145, .05); }
.case-capability-card header { display: flex; align-items: flex-start; gap: 15px; }
.case-capability-card header > span { flex: 0 0 auto; display: grid; place-items: center; width: 44px; height: 44px; color: #fff; background: #154a91; border-radius: 13px; font: 800 13px/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.case-capability-card h3 { margin: 0; color: #173f79; font-size: 21px; }
.case-capability-card header p { margin: 3px 0 0; color: #6c8099; font-size: 13px; }
.case-capability-card > p { margin: 11px 0 0; color: #536b88; }
.case-capability-card > p strong { color: #264d7e; }
.case-disclosure { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 18px 0 22px; }
.case-disclosure span { padding: 13px 14px; color: #526983; background: #f6faff; border: 1px solid #dce8f7; border-radius: 12px; font-size: 13px; line-height: 1.6; }
.case-disclosure b { display: block; color: #174f96; }
.featured-case-grid { display: grid; gap: 22px; margin: 22px 0 42px; }
.featured-case { overflow: hidden; background: #fff; border: 1px solid #d8e6f7; border-radius: 18px; box-shadow: 0 18px 46px rgba(20, 74, 145, .08); }
.featured-case > img { width: 100%; height: auto; aspect-ratio: auto; object-fit: contain; background: #eaf2fb; }
.featured-case-body { padding: 24px; }
.featured-case-index { display: inline-flex; padding: 6px 9px; color: #0d5cd7; background: #edf5ff; border-radius: 999px; font: 800 11px/1 ui-monospace, SFMono-Regular, Consolas, monospace; }
.featured-case h3 { margin: 13px 0 16px; color: #173f79; font-size: 23px; }
.featured-case dl { display: grid; gap: 0; margin: 0; }
.featured-case dl > div { display: grid; grid-template-columns: 90px 1fr; gap: 12px; padding: 11px 0; border-top: 1px solid #e6eef8; }
.featured-case dt { color: #214d83; font-weight: 800; }
.featured-case dd { margin: 0; color: #536b88; }
.case-evidence-tags { display: flex; flex-wrap: wrap; gap: 7px; margin: 16px 0 3px 59px; }
.case-evidence-tags b { padding: 5px 9px; color: #1552a0; background: #eaf4ff; border: 1px solid #d4e8ff; border-radius: 999px; font-size: 12px; }
.case-tech-section { padding: 2px 0 8px; }

@media (max-width: 850px) {
  .layout { grid-template-columns: 1fr; }
  aside { order: -1; }
  .hero { padding: 38px 0 46px; }
  .decision-grid { grid-template-columns: 1fr; }
  .question-hub-layout aside { order: 0; }
  .question-page-layout aside { order: 0; }
  .facts-page-layout aside { order: 0; }
  .resource-layout aside { order: 0; }
  .case-page-layout aside { order: 0; }
  .evidence-grid, .step-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  html, body, .topbar { max-width: 100vw; overflow-x: hidden; }
  .nav, .hero, .layout, .footer-inner { width: 100%; max-width: 100%; margin-left: 0; margin-right: 0; padding-left: 18px; padding-right: 18px; }
  .nav { flex-direction: column; align-items: stretch; }
  .nav-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); width: 100%; min-width: 0; }
  .nav-links a { min-width: 0; padding: 7px 8px; text-align: center; }
  .hero h1, .hero p, .citation { max-width: 100%; overflow-wrap: anywhere; }
  main { width: 100%; max-width: 100%; min-width: 0; padding: 24px; overflow: hidden; border-radius: 14px; }
  .question-index { grid-template-columns: 1fr; }
  .question-group-head { grid-template-columns: 1fr; }
  .question-group-head p { grid-row: auto; width: max-content; min-height: 32px; padding: 4px 10px; }
  .fact-table > div { grid-template-columns: 1fr; gap: 3px; }
  .interview-list, .resource-card-grid, .case-principle-grid, .case-tech-grid, .case-disclosure, .role-grid, .profile-summary, .fit-grid, .risk-list, .ability-boundary, .deep-actions { grid-template-columns: 1fr; }
  .profile-summary > img { width: 100%; height: min(440px, 95vw); }
  .featured-case-body { padding: 19px; }
  .featured-case dl > div { grid-template-columns: 1fr; gap: 4px; }
  .resource-cta { grid-template-columns: 1fr; }
  .resource-cta span { grid-row: auto; width: max-content; }
  .content-cta { grid-template-columns: 1fr; }
  .content-cta span { grid-row: auto; width: max-content; }
  .case-capability-card { padding: 19px; }
  .case-evidence-tags { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

@media print {
  body { background: #fff; font-size: 12pt; }
  .topbar .nav, .nav-links, .resource-actions, body > .footer, .layout > aside, .skip-link { display: none !important; }
  .topbar { color: #111; background: #fff; }
  .hero { padding: 16px 0 20px; }
  .hero h1, .hero p { color: #111; }
  .breadcrumbs { color: #444; }
  .layout { display: block; width: 100%; padding: 0; }
  main { padding: 0; border: 0; box-shadow: none; }
  .citation, .source-note, .page-note { border-color: #bbb; background: #fff; }
  .check-table { min-width: 0; }
}