:root {
  --blue: #2f4778;
  --blue-dark: #20365f;
  --green: #9ec451;
  --green-dark: #5d7435;
  --ink: #263143;
  --muted: #536475;
  --line: #d9e2ef;
  --soft: #f5f8f1;
  --paper: #ffffff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: #eef3f6;
  font-family: Arial, Helvetica, sans-serif;
}

a { color: #0c5d88; }

.help-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 4px solid var(--green);
  box-shadow: 0 2px 12px rgba(25, 43, 58, 0.12);
}

.help-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(1240px, calc(100% - 32px));
  margin: 0 auto;
  padding: 9px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--blue);
  text-decoration: none;
}

.brand img { width: 52px; height: 52px; object-fit: contain; }
.brand span { display: grid; }
.brand small { color: var(--green-dark); font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .07em; }
.brand strong { font-size: 18px; }

.help-header nav { display: flex; align-items: center; gap: 18px; }
.help-header nav a { color: var(--ink); font-size: 13px; font-weight: 700; text-decoration: none; }
.help-header nav a:hover { color: var(--blue); text-decoration: underline; }
.help-header nav .map-link { padding: 10px 13px; color: #fff; background: var(--blue); border-radius: 7px; }
.help-header nav .map-link:hover { color: #fff; background: var(--blue-dark); text-decoration: none; }

main { width: min(1240px, calc(100% - 32px)); margin: 0 auto; }

.help-hero {
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(460px, 1.15fr);
  gap: 36px;
  align-items: center;
  padding: 48px 0 34px;
}

.eyebrow {
  margin: 0 0 7px;
  color: var(--green-dark);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .09em;
  text-transform: uppercase;
}

h1, h2, h3 { color: var(--blue); }
h1 { margin: 0; font-size: clamp(34px, 5vw, 58px); line-height: 1.02; letter-spacing: -.025em; }
.lead { margin: 20px 0 0; color: var(--muted); font-size: 18px; line-height: 1.58; }

.stat-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 24px;
}

.stat-strip div { padding: 13px; background: #fff; border: 1px solid var(--line); border-radius: 9px; }
.stat-strip strong { display: block; color: var(--blue); font-size: 19px; }
.stat-strip span { color: var(--muted); font-size: 11px; font-weight: 700; }

figure { margin: 0; }
.help-hero__visual, .data-visual { overflow: hidden; background: #fff; border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 18px 46px rgba(30, 50, 65, .14); }
.help-hero__visual img, .data-visual img { display: block; width: 100%; height: auto; }
.help-hero__visual figcaption { padding: 10px 14px; color: var(--muted); font-size: 12px; line-height: 1.4; }

.section {
  margin: 26px 0;
  padding: 34px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 15px;
  scroll-margin-top: 88px;
}

.section-heading { max-width: 830px; margin-bottom: 24px; }
.section-heading h2 { margin: 0; font-size: clamp(27px, 4vw, 40px); line-height: 1.08; }
.section-heading > p:last-child { margin: 10px 0 0; color: var(--muted); font-size: 16px; line-height: 1.55; }

.steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; margin: 0; padding: 0; list-style: none; }
.steps li { padding: 18px; background: var(--soft); border: 1px solid #dce8ca; border-radius: 10px; }
.steps li > span, .source-flow article > span { display: grid; place-items: center; width: 32px; height: 32px; color: #fff; background: var(--blue); border-radius: 50%; font-weight: 800; }
.steps h3, .source-flow h3 { margin: 13px 0 6px; font-size: 16px; }
.steps p, .source-flow p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.5; }

.control-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; background: transparent; border: 0; padding: 0; }
.control-grid article { padding: 22px; background: #fff; border: 1px solid var(--line); border-top: 5px solid var(--green); border-radius: 12px; scroll-margin-top: 90px; }
.control-icon { display: grid; place-items: center; width: 44px; height: 44px; color: #fff; background: var(--blue); border-radius: 10px; font-size: 24px; }
.control-grid h2 { margin: 14px 0 7px; font-size: 20px; }
.control-grid p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.55; }

.data-section { background: linear-gradient(145deg, #fff 0%, #f6faf1 100%); }
.data-visual { max-width: 1000px; margin: 0 auto; }
.source-flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 15px; margin-top: 24px; }
.source-flow article { position: relative; padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 10px; }
.source-flow article:not(:last-child)::after { content: "→"; position: absolute; right: -14px; top: 23px; z-index: 2; color: var(--blue); font-size: 20px; font-weight: 800; }

.topic-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.topic-grid article { padding: 18px; background: #f7fafc; border: 1px solid var(--line); border-radius: 10px; scroll-margin-top: 90px; }
.topic-grid h3 { margin: 0 0 7px; font-size: 17px; }
.topic-grid p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.5; }

.caution-section { border-left: 7px solid #c98c2f; }
.caution-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.caution-grid p { margin: 0; padding: 16px; background: #fff9ef; border: 1px solid #edd6ad; border-radius: 9px; color: #5b4b32; font-size: 13px; line-height: 1.5; }

.directory-tools { display: flex; align-items: center; gap: 16px; margin-bottom: 18px; }
.directory-tools input { flex: 1 1 auto; height: 44px; padding: 0 12px; border: 1px solid #9cabb8; border-radius: 7px; font: inherit; }
.directory-tools span { color: var(--muted); font-size: 13px; }
.directory-list { display: grid; gap: 10px; }
.directory-group { border: 1px solid var(--line); border-radius: 9px; overflow: hidden; }
.directory-group > summary { padding: 13px 15px; color: var(--blue); background: #f3f6f8; font-weight: 800; cursor: pointer; }
.directory-group__body { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; padding: 10px; }
.layer-card { padding: 14px; background: #fff; border: 1px solid #e1e8ee; border-left: 4px solid var(--green); border-radius: 7px; scroll-margin-top: 92px; }
.layer-card.is-target { border-color: var(--blue); border-left-width: 7px; box-shadow: 0 0 0 3px rgba(47, 71, 120, .13); }
.layer-card h3 { margin: 0; font-size: 16px; }
.layer-card__meta { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.layer-card__meta span { padding: 3px 7px; color: #425361; background: #eef3f6; border-radius: 999px; font-size: 11px; font-weight: 700; }
.layer-card p { margin: 6px 0 0; color: var(--muted); font-size: 12px; line-height: 1.48; }
.layer-card details { margin-top: 8px; }
.layer-card summary { color: #0c5d88; font-size: 12px; font-weight: 800; cursor: pointer; }
.layer-card a { display: inline-block; margin-top: 8px; font-size: 12px; font-weight: 800; }

.help-update-log { display: grid; gap: 12px; }
.help-update-entry { display: grid; grid-template-columns: 135px 1fr; gap: 16px; padding: 16px; background: #f7fafc; border: 1px solid var(--line); border-radius: 9px; }
.help-update-entry time { color: var(--green-dark); font-weight: 800; }
.help-update-entry h3 { margin: 0; font-size: 17px; }
.help-update-entry ul { margin: 7px 0 0; padding-left: 18px; color: var(--muted); font-size: 13px; line-height: 1.5; }

footer { display: flex; align-items: center; gap: 14px; width: min(1240px, calc(100% - 32px)); margin: 30px auto; padding: 24px; color: #fff; background: var(--blue); border-radius: 12px; }
footer img { width: 54px; height: 54px; padding: 4px; object-fit: contain; background: #fff; border-radius: 50%; }
footer p { margin: 0; flex: 1; font-size: 13px; line-height: 1.45; }
footer a { color: #fff; font-weight: 800; }

@media (max-width: 980px) {
  .help-header nav a:not(.map-link) { display: none; }
  .help-hero { grid-template-columns: 1fr; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .control-grid, .topic-grid, .caution-grid { grid-template-columns: repeat(2, 1fr); }
  .source-flow { grid-template-columns: repeat(2, 1fr); }
  .source-flow article::after { display: none; }
}

@media (max-width: 640px) {
  .help-header__inner, main, footer { width: min(100% - 20px, 1240px); }
  .brand img { width: 42px; height: 42px; }
  .brand strong { font-size: 15px; }
  .help-header nav .map-link { padding: 9px 10px; }
  .help-hero { padding-top: 30px; gap: 24px; }
  .help-hero__copy h1 { font-size: 36px; }
  .lead { font-size: 16px; }
  .stat-strip { grid-template-columns: 1fr; }
  .section { padding: 22px 17px; border-radius: 11px; }
  .steps, .control-grid, .topic-grid, .caution-grid, .source-flow, .directory-group__body { grid-template-columns: 1fr; }
  .directory-tools { align-items: stretch; flex-direction: column; }
  .help-update-entry { grid-template-columns: 1fr; gap: 5px; }
  footer { align-items: flex-start; flex-wrap: wrap; }
}

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