:root {
  color-scheme: light dark;
  --bg: #f6f8f6;
  --surface: #fbfcfb;
  --surface-strong: #ffffff;
  --surface-tint: #eaf3ed;
  --text: #172019;
  --muted: #59645c;
  --line: #d7ded9;
  --accent: #08783f;
  --accent-hover: #056532;
  --accent-ink: #f5fff8;
  --warning: #8d4b0a;
  --warning-bg: #fff4e4;
  --focus: #148850;
  --shadow: 0 22px 64px rgba(26, 62, 39, 0.13);
  --radius: 14px;
  --control-radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101512;
    --surface: #151c17;
    --surface-strong: #19211b;
    --surface-tint: #1a2a20;
    --text: #edf4ef;
    --muted: #a8b3ab;
    --line: #303a33;
    --accent: #3cba74;
    --accent-hover: #67d091;
    --accent-ink: #07140c;
    --warning: #f1b46b;
    --warning-bg: #2b2116;
    --focus: #67d091;
    --shadow: 0 22px 64px rgba(0, 0, 0, 0.38);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  line-height: 1.62;
  text-rendering: optimizeLegibility;
}
a { color: inherit; }
img { display: block; max-width: 100%; height: auto; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }

.skip-link {
  position: fixed;
  left: 16px;
  top: -72px;
  z-index: 20;
  padding: 10px 14px;
  border-radius: var(--control-radius);
  background: var(--text);
  color: var(--bg);
  font-weight: 700;
}
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: 68px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 0 max(24px, 4vw);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 84%, transparent);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(16px) saturate(135%);
  -webkit-backdrop-filter: blur(16px) saturate(135%);
}
.brand { display: inline-flex; align-items: center; gap: 10px; width: fit-content; color: var(--text); font-weight: 760; letter-spacing: -0.02em; text-decoration: none; }
.brand img { border-radius: 9px; }
nav { display: flex; align-items: center; gap: 24px; }
nav a, footer > a { color: var(--muted); font-size: 14px; font-weight: 650; text-decoration: none; }
nav a:hover, footer > a:hover { color: var(--accent); }
.header-actions { justify-self: end; display: flex; align-items: center; gap: 9px; }

button, .download-button, .primary-cta, .secondary-cta {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 15px;
  border: 1px solid var(--line);
  border-radius: var(--control-radius);
  font: inherit;
  font-size: 14px;
  font-weight: 720;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 150ms ease, background 150ms ease, border-color 150ms ease;
}
button:active, .download-button:active, .primary-cta:active, .secondary-cta:active { transform: translateY(1px); }
.language-switch, .secondary-cta { background: var(--surface-strong); color: var(--text); }
.download-button, .primary-cta { border-color: var(--accent); background: var(--accent); color: var(--accent-ink); }
.download-button:hover, .primary-cta:hover { border-color: var(--accent-hover); background: var(--accent-hover); }
.language-switch:hover, .secondary-cta:hover { border-color: var(--accent); }

.hero {
  min-height: calc(100dvh - 68px);
  max-width: 1440px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(330px, 0.72fr) minmax(540px, 1.38fr);
  align-items: center;
  gap: clamp(40px, 6vw, 88px);
  padding: 58px max(24px, 4vw) 72px;
}
.hero-copy { max-width: 550px; }
.kicker { margin: 0 0 14px; color: var(--accent); font-size: 13px; font-weight: 760; }
h1, h2, h3, p { margin-top: 0; }
h1 { max-width: 12ch; margin-bottom: 20px; font-size: clamp(42px, 5vw, 70px); line-height: 1; letter-spacing: -0.052em; }
.hero-summary { max-width: 49ch; margin-bottom: 26px; color: var(--muted); font-size: 18px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 18px; }
.text-link, .inline-action { color: var(--accent); font-weight: 720; text-underline-offset: 4px; }
.hero-visual { margin: 0; }
.hero-visual img, .guide-shot img { width: 100%; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }

.start-here {
  max-width: 1180px;
  margin: 0 auto;
  padding: 72px max(24px, 4vw);
  display: grid;
  grid-template-columns: 0.65fr 1.35fr;
  gap: 64px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.start-here h2 { margin-bottom: 8px; font-size: 30px; letter-spacing: -0.035em; }
.start-here p { margin: 0; color: var(--muted); }
.task-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 28px; }
.task-links a { display: grid; gap: 2px; padding: 14px 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.task-links a:hover strong { color: var(--accent); }
.task-links strong { font-size: 15px; }
.task-links span { color: var(--muted); font-size: 13px; }

.docs-layout {
  max-width: 1220px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 220px minmax(0, 820px);
  justify-content: space-between;
  gap: clamp(54px, 8vw, 108px);
  padding: 100px max(24px, 4vw) 120px;
}
.contents { position: sticky; top: 96px; align-self: start; display: grid; gap: 2px; }
.contents p { margin-bottom: 10px; color: var(--text); font-size: 13px; font-weight: 760; }
.contents a { padding: 7px 10px; border-left: 2px solid transparent; color: var(--muted); font-size: 14px; text-decoration: none; }
.contents a:hover, .contents a.active { border-left-color: var(--accent); color: var(--accent); background: var(--surface-tint); }

.guide-content { min-width: 0; }
.doc-section { padding: 0 0 108px; }
.doc-section + .doc-section { padding-top: 10px; }
.section-heading { max-width: 680px; margin-bottom: 34px; }
h2 { margin-bottom: 12px; font-size: clamp(32px, 4vw, 48px); line-height: 1.08; letter-spacing: -0.043em; }
h3 { margin-bottom: 7px; font-size: 19px; line-height: 1.3; letter-spacing: -0.02em; }
.section-heading p, .doc-section > p { color: var(--muted); font-size: 17px; }
.section-heading p { margin-bottom: 0; max-width: 62ch; }

.instructions { list-style: none; margin: 0; padding: 0; }
.instructions li { display: grid; grid-template-columns: 34px minmax(0, 1fr); gap: 17px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.instructions li:first-child { padding-top: 0; }
.instruction-number { width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%; background: var(--surface-tint); color: var(--accent); font-size: 13px; font-weight: 800; }
.instructions p { max-width: 65ch; margin-bottom: 7px; color: var(--muted); }
.instructions.compact { margin-top: 38px; }
.instructions.compact li { padding: 20px 0; }

.note, .warning { display: grid; gap: 5px; margin-top: 28px; padding: 18px 20px; border-radius: var(--radius); }
.note { border-left: 4px solid var(--accent); background: var(--surface-tint); }
.warning { border-left: 4px solid var(--warning); background: var(--warning-bg); }
.note span, .warning span { color: var(--muted); }
.warning strong { color: var(--warning); }

.area-list { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 44px; }
.area-list div { padding-top: 18px; border-top: 2px solid var(--line); }
.area-list dt { margin-bottom: 5px; font-weight: 760; }
.area-list dd { margin: 0; color: var(--muted); }

.guide-shot { margin: 0; }
.guide-shot figcaption { max-width: 72ch; margin-top: 14px; color: var(--muted); font-size: 14px; }
.two-column-help { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 42px; margin-top: 38px; }
.two-column-help > div { padding-top: 20px; border-top: 2px solid var(--line); }
.two-column-help p { margin: 0; color: var(--muted); }

.faq-list { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { padding: 20px 4px; font-weight: 730; cursor: pointer; }
summary::marker { color: var(--accent); }
details p { max-width: 70ch; margin: -5px 30px 22px 4px; color: var(--muted); }
.support-row { margin-top: 42px; padding: 28px; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 32px; border-radius: var(--radius); background: var(--surface-tint); }
.support-row h3 { margin-bottom: 5px; }
.support-row p { max-width: 55ch; margin: 0; color: var(--muted); }

footer { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: 32px; padding: 30px max(24px, 4vw) 42px; border-top: 1px solid var(--line); }
footer p { margin: 0; color: var(--muted); font-size: 14px; }

@media (max-width: 980px) {
  .site-header { grid-template-columns: 1fr auto; }
  nav { display: none; }
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 64px; }
  .hero-copy { max-width: 690px; }
  .start-here { grid-template-columns: 1fr; gap: 24px; }
  .docs-layout { grid-template-columns: 1fr; padding-top: 64px; }
  .contents { position: static; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 6px; padding-bottom: 32px; border-bottom: 1px solid var(--line); }
  .contents p { grid-column: 1 / -1; }
  .contents a { border: 1px solid var(--line); border-radius: var(--control-radius); background: var(--surface); text-align: center; }
  .contents a:hover, .contents a.active { border-color: var(--accent); }
}

@media (max-width: 680px) {
  html { scroll-padding-top: 78px; }
  .site-header { height: 62px; padding: 0 16px; }
  .brand span, .download-button { display: none; }
  .hero { padding: 44px 16px 56px; gap: 36px; }
  h1 { font-size: clamp(39px, 12vw, 54px); }
  .start-here { padding: 52px 16px; }
  .task-links, .area-list, .two-column-help { grid-template-columns: 1fr; }
  .docs-layout { gap: 52px; padding: 54px 16px 82px; }
  .contents { display: flex; overflow-x: auto; padding-bottom: 18px; scroll-snap-type: x mandatory; }
  .contents p { display: none; }
  .contents a { flex: 0 0 auto; scroll-snap-align: start; padding: 8px 12px; }
  .doc-section { padding-bottom: 82px; }
  .support-row { grid-template-columns: 1fr; padding: 22px; }
  .secondary-cta { justify-self: start; }
  footer { grid-template-columns: 1fr auto; padding-left: 16px; padding-right: 16px; }
  footer p { display: none; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition-duration: 0.01ms !important; } }
@media (prefers-reduced-transparency: reduce) { .site-header { background: var(--bg); backdrop-filter: none; -webkit-backdrop-filter: none; } }