:root {
  --orange: #e76528;
  --green: #143c32;
  --cream: #f5f0e7;
  --paper: #fbf9f5;
  --ink: #282623;
  --muted: #766f66;
  --line: #d7d0c4;
  --body-size: 15px;
  --support-size: 13px;
  --note-size: 12px;
  --body-leading: 1.8;
  --sans: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  --mono: "DM Mono", "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scrollbar-color: #8b9d95 var(--cream); scrollbar-width: thin; }
body { margin: 0; color: var(--ink); background: var(--paper); font: var(--body-size)/var(--body-leading) var(--sans); }
a { color: inherit; text-decoration: none; }
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible, textarea:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: var(--cream); }
*::-webkit-scrollbar-thumb { background: #8b9d95; border: 2px solid var(--cream); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 max(28px, calc((100% - 1200px) / 2));
  color: #fff;
  background: var(--green);
  box-shadow: 0 1px 0 rgba(255,255,255,.08);
}
.topbar img { display: block; width: 208px; height: auto; }
.topbar nav { display: flex; align-items: center; gap: 30px; font-size: var(--support-size); }
.topbar nav a { opacity: .86; }
.topbar nav a:hover, .topbar nav a.active { color: #f3a071; opacity: 1; }
.menu { display: none; padding: 8px 12px; border: 1px solid #729086; color: #fff; background: none; }

.page-hero {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: 8%;
  min-height: 430px;
  padding: 104px max(28px, calc((100% - 1200px) / 2)) 110px;
  color: #fff;
  background: var(--green);
  scroll-margin-top: 72px;
}
.eyebrow, .index, .kicker { color: var(--orange); font: 600 var(--note-size) var(--mono); letter-spacing: .08em; }
h1 { margin: 24px 0; font-size: clamp(42px, 6vw, 78px); font-weight: 700; line-height: 1.12; letter-spacing: -.06em; }
h2 { margin: 0 0 30px; font-size: clamp(30px, 4vw, 52px); line-height: 1.2; letter-spacing: -.05em; }
h3 { margin: 0 0 12px; font-size: 22px; line-height: 1.35; }
em { color: var(--orange); font-style: normal; }
.hero-note { align-self: end; max-width: 470px; padding-left: 30px; border-left: 1px solid #678077; color: #c9d4ce; }
.hero-note strong { display: block; margin-bottom: 14px; color: #fff; font-size: 18px; }

.page { padding: 110px max(28px, calc((100% - 1200px) / 2)); scroll-margin-top: 72px; }
.intro { display: grid; grid-template-columns: 1fr 2fr; gap: 8%; margin-bottom: 72px; }
.intro p, .copy p, .about-block p { max-width: 680px; margin: 0; color: var(--muted); }
.rule-list { border-top: 1px solid var(--line); }
.rule-item { display: grid; grid-template-columns: 1fr 3fr 5fr; gap: 25px; padding: 30px 0; border-bottom: 1px solid var(--line); }
.rule-item .num { color: var(--orange); font: var(--note-size) var(--mono); }
.rule-item p, .copy p { margin: 0; color: var(--muted); font-size: var(--body-size); }
.dark { color: #fff; background: var(--green); }
.dark .rule-list, .dark .rule-item { border-color: #567065; }
.dark p { color: #c3d1c9; }

.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; margin-top: 55px; background: var(--line); }
.detail-grid article { min-height: 230px; padding: 32px; background: var(--paper); }
.detail-grid article p, .case-card p, .tool-card p { color: var(--muted); font-size: var(--body-size); }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.case-card { padding: 25px 0; border-top: 3px solid var(--orange); }
.case-card .tag { color: var(--orange); font: var(--note-size) var(--mono); }

.about-block { display: grid; grid-template-columns: 1fr 2fr; gap: 10%; align-items: start; }
.about-block p { line-height: 1.9; }
.quote { margin-top: 50px; padding: 35px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--green); font-size: 34px; line-height: 1.35; }
.tool-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.tool-card { padding: 35px; border: 1px solid #567065; }
.tool-card p { color: #c3d1c9; }

.qa-archive { width: min(850px, 100%); margin-left: auto; border-bottom: 1px solid var(--line); }
.qa-archive details { padding: 24px 0; border-top: 1px solid var(--line); }
.qa-archive summary { display: flex; justify-content: space-between; gap: 30px; list-style: none; cursor: pointer; font-size: 17px; font-weight: 600; }
.qa-archive summary::-webkit-details-marker { display: none; }
.qa-archive summary b { color: var(--orange); font-size: 22px; font-weight: 400; }
.qa-archive p { max-width: 760px; margin: 16px 40px 0 0; color: var(--muted); }
.qa-archive p strong { color: var(--green); }
.qa-page > .button { margin-left: calc(100% - min(850px, 100%)); margin-top: 32px; }

.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 12%; align-items: start; }
.contact-form { padding: 36px; background: var(--cream); }
.contact-form label { display: block; margin-bottom: 20px; font-size: var(--note-size); }
.contact-form input, .contact-form textarea { display: block; width: 100%; margin-top: 7px; padding: 10px 0; border: 0; border-bottom: 1px solid var(--line); background: transparent; font: inherit; }
.contact-form textarea { min-height: 110px; resize: vertical; }
.fixed-textarea { resize: none; }
.button { display: inline-flex; margin-top: 8px; padding: 14px 22px; border: 0; color: #fff; background: var(--orange); font-size: var(--support-size); font-weight: 700; cursor: pointer; }
.button:disabled { color: #746e66; background: #d7d0c4; cursor: not-allowed; }
.contact-mail { margin-left: 10px; }

.site-footer { display: flex; justify-content: space-between; padding: 56px max(28px, calc((100% - 1200px) / 2)); color: #c3d1c9; background: var(--green); font-size: var(--note-size); }
.site-footer img { display: block; width: 190px; height: auto; }
.site-footer a { color: #fff; }
.back { display: block; margin-top: 20px; color: var(--orange) !important; }
.not-found { min-height: 100vh; padding: 18vh max(28px, calc((100% - 1200px) / 2)); color: #fff; background: var(--green); }
.not-found h1 { margin: 28px 0; }
.not-found p { max-width: 480px; color: #c9d4ce; }

@media (max-width: 800px) {
  .topbar { height: 64px; }
  .topbar img { width: 164px; }
  .menu { display: block; }
  .topbar nav { display: none; position: absolute; z-index: 5; top: 64px; left: 0; right: 0; height: calc(100vh - 64px); background: var(--green); flex-direction: column; justify-content: center; font-size: 18px; }
  .topbar nav.open { display: flex; }
  .page-hero { display: block; min-height: 0; padding-top: 78px; padding-bottom: 78px; }
  .hero-note { margin-top: 50px; padding: 20px 0 0; border-top: 1px solid #567065; border-left: 0; }
  .page { padding: 75px 28px; }
  .intro, .about-block, .contact-layout { display: block; }
  .intro p { margin-top: 28px; }
  .detail-grid, .tool-grid { grid-template-columns: 1fr; }
  .detail-grid article { min-height: 0; }
  .rule-item { grid-template-columns: 1fr 4fr; gap: 14px; }
  .rule-item p { grid-column: 2; }
  .case-grid { grid-template-columns: 1fr; }
  .quote { font-size: 26px; }
  .qa-archive { margin-left: 0; }
  .qa-archive summary { font-size: var(--body-size); }
  .qa-page > .button { margin-left: 0; }
  .contact-mail { display: flex; width: max-content; margin-left: 0; }
  .site-footer { display: block; }
  .site-footer > div { margin-top: 26px; }
  .site-footer > div:first-child { margin-top: 0; }
}

@media (forced-colors: active) { html { scrollbar-color: auto; } }