:root {
  color-scheme: dark;
  --night: #05070c;
  --surface: #0b1015;
  --ink: #f5ecd7;
  --muted: #a7acb0;
  --line: #263038;
  --gold: #efa941;
  --cyan: #63ccd0;
  --rose: #bd7690;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--night);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--night);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.65;
  letter-spacing: 0;
}

a {
  color: inherit;
  text-underline-offset: 0.24em;
  text-decoration-thickness: 1px;
}

a:hover,
a:focus-visible {
  color: var(--cyan);
}

a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 6px;
}

.site-header,
footer {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-header {
  min-height: 88px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.1;
  text-decoration: none;
}

.brand img {
  width: 44px;
  height: 44px;
  object-fit: cover;
}

nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

nav a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  text-transform: uppercase;
}

nav a[aria-current="page"] {
  color: var(--gold);
}

.home-main {
  width: min(1180px, calc(100% - 48px));
  min-height: calc(100vh - 176px);
  margin: 0 auto;
  display: grid;
  align-items: center;
}

.home-identity {
  display: grid;
  grid-template-columns: minmax(280px, 0.78fr) minmax(340px, 1.22fr);
  align-items: center;
  gap: clamp(36px, 8vw, 120px);
  padding: 52px 0;
}

.hero-mark {
  width: min(100%, 520px);
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
}

.eyebrow,
.section-index {
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.04;
  letter-spacing: 0;
}

h1 {
  max-width: 760px;
  font-size: clamp(44px, 7vw, 94px);
}

h2 {
  margin-bottom: 24px;
  font-size: clamp(28px, 4vw, 44px);
}

.lead {
  max-width: 610px;
  margin: 28px 0 44px;
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(20px, 2.4vw, 30px);
  line-height: 1.45;
}

.home-links {
  max-width: 610px;
  border-top: 1px solid var(--line);
}

.home-links a {
  min-height: 68px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: var(--ink);
  font-weight: 750;
  text-decoration: none;
}

.home-links a:first-child span:last-child {
  color: var(--gold);
}

.home-links a:last-child span:last-child {
  color: var(--rose);
}

.document-main {
  width: min(980px, calc(100% - 48px));
  margin: 0 auto;
  padding: 96px 0 120px;
}

.document-title {
  max-width: 790px;
  padding-bottom: 68px;
}

.document-title h1 {
  font-size: clamp(50px, 8vw, 88px);
}

.document-title > p:last-of-type {
  max-width: 690px;
  margin: 24px 0 0;
  color: var(--muted);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(20px, 2.5vw, 28px);
}

.contact-link {
  display: inline-flex;
  gap: 14px;
  margin-top: 32px;
  color: var(--gold);
  font-weight: 750;
}

.language-links {
  display: flex;
  gap: 28px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.language-links a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
  text-transform: uppercase;
}

.document-section {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr);
  gap: 30px;
  padding: 72px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 20px;
}

.document-section p {
  margin: 0 0 22px;
  color: #d9d9d4;
}

.document-section strong {
  color: var(--ink);
}

.document-section a {
  color: var(--cyan);
}

.section-index {
  margin: 7px 0 0 !important;
}

.guide-lede {
  max-width: 720px;
  color: var(--muted) !important;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 21px;
}

.guide-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin: 34px 0 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.guide-nav a {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
  text-decoration: none;
  text-transform: uppercase;
}

.guide-block {
  padding: 54px 0 8px;
  scroll-margin-top: 20px;
}

.guide-block + .guide-block {
  margin-top: 30px;
  border-top: 1px solid var(--line);
}

.guide-block h3 {
  margin: 0 0 22px;
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(25px, 3vw, 34px);
  line-height: 1.2;
}

.guide-steps,
.reading-list {
  margin: 28px 0;
  padding: 0;
  list-style: none;
  counter-reset: guide-step;
}

.guide-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.guide-steps li,
.reading-list li {
  position: relative;
  counter-increment: guide-step;
  color: #d9d9d4;
}

.guide-steps li {
  padding: 46px 0 4px;
  border-top: 1px solid var(--line);
}

.guide-steps li::before,
.reading-list li::before {
  content: counter(guide-step, decimal-leading-zero);
  color: var(--gold);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  font-weight: 800;
}

.guide-steps li::before {
  position: absolute;
  top: 14px;
  left: 0;
}

.guide-steps strong,
.reading-list strong {
  display: block;
  margin-bottom: 5px;
  color: var(--ink);
}

.reading-list li {
  min-height: 54px;
  padding: 0 0 24px 52px;
}

.reading-list li::before {
  position: absolute;
  top: 2px;
  left: 0;
}

.hint-stages,
.cycle-guide,
.troubleshooting {
  margin: 28px 0;
}

.hint-stages > div,
.cycle-guide > div,
.troubleshooting > div {
  display: grid;
  grid-template-columns: minmax(150px, 0.42fr) minmax(0, 1fr);
  gap: 28px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.hint-stages > div:last-child,
.cycle-guide > div:last-child,
.troubleshooting > div:last-child {
  border-bottom: 1px solid var(--line);
}

.hint-stages dt,
.cycle-guide dt,
.troubleshooting dt {
  color: var(--ink);
  font-weight: 800;
}

.hint-stages dd,
.cycle-guide dd,
.troubleshooting dd {
  margin: 0;
  color: var(--muted);
}

.spoiler-note {
  padding-left: 18px;
  border-left: 2px solid var(--rose);
  color: var(--muted) !important;
}

.mechanic-list {
  margin-top: 30px;
  border-top: 1px solid var(--line);
}

.mechanic-list details {
  border-bottom: 1px solid var(--line);
}

.mechanic-list summary {
  min-height: 68px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 24px;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

.mechanic-list summary::-webkit-details-marker {
  display: none;
}

.mechanic-list summary span:first-child {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 22px;
  font-weight: 700;
}

.mechanic-list summary span:last-child {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.mechanic-list summary::after {
  content: "+";
  grid-column: 3;
  color: var(--cyan);
  font-size: 22px;
}

.mechanic-list details[open] summary::after {
  content: "−";
}

.mechanic-list details p {
  max-width: 700px;
  margin: 0;
  padding: 0 54px 28px 0;
  color: var(--muted);
}

.support-contact {
  padding-bottom: 36px;
}

footer {
  min-height: 88px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

footer a {
  color: var(--muted);
}

@media (max-width: 720px) {
  .site-header,
  footer,
  .home-main,
  .document-main {
    width: min(100% - 32px, 1000px);
  }

  .site-header {
    min-height: 76px;
  }

  .brand span {
    display: none;
  }

  nav {
    gap: 20px;
  }

  .home-identity {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 36px 0 60px;
  }

  .hero-mark {
    width: min(68vw, 330px);
  }

  .home-copy h1 {
    font-size: 48px;
  }

  .document-main {
    padding: 64px 0 88px;
  }

  .document-title {
    padding-bottom: 48px;
  }

  .document-section {
    grid-template-columns: 1fr;
    gap: 14px;
    padding: 52px 0;
  }

  .guide-steps {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .hint-stages > div,
  .cycle-guide > div,
  .troubleshooting > div {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .mechanic-list summary {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
  }

  .mechanic-list summary span:last-child {
    display: none;
  }

  .mechanic-list summary::after {
    grid-column: 2;
  }

  .mechanic-list details p {
    padding-right: 0;
  }

  footer {
    min-height: 108px;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
  }
}

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