:root {
  --paper: #fffcdc;
  --ink: #14281d;
  --muted: #535c51;
  --rule: #14281d;
  --accent: #1976d2;
  --stamp: #1976d2;
  --desk: #14281d;
  --shadow: rgba(20, 40, 29, 0.35);
  --paper-fiber: rgba(20, 40, 29, 0.055);
  --font-body: "Public Sans", "Helvetica Neue", Arial, sans-serif;
  --font-display: "Archivo Narrow", "Public Sans", "Helvetica Neue", Arial, sans-serif;
  --font-code: ui-monospace, "SFMono-Regular", "Cascadia Mono", "Liberation Mono", "Courier New", monospace;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--desk);
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(90deg, rgba(255, 252, 220, 0.02), transparent 26%, rgba(255, 252, 220, 0.04) 52%, transparent 78%),
    var(--desk);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.58;
  font-feature-settings: "tnum" 1, "case" 1;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.6;
  background-image:
    repeating-linear-gradient(0deg, transparent 0 13px, rgba(255, 252, 220, 0.025) 13px 14px),
    repeating-linear-gradient(90deg, transparent 0 17px, rgba(255, 252, 220, 0.018) 17px 18px);
}

.page-shell {
  width: min(1180px, calc(100% - 28px));
  margin: 18px auto;
  padding: clamp(18px, 4vw, 48px);
  min-height: calc(100vh - 36px);
  position: relative;
  background:
    repeating-linear-gradient(90deg, transparent 0 34px, var(--paper-fiber) 34px 35px),
    repeating-linear-gradient(0deg, transparent 0 28px, rgba(20, 40, 29, 0.028) 28px 29px),
    var(--paper);
  border: 3px solid var(--rule);
  box-shadow: 12px 12px 0 var(--shadow);
  isolation: isolate;
}

.page-shell::before,
.page-shell::after {
  content: "";
  position: absolute;
  top: 92px;
  bottom: 92px;
  width: 22px;
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 52px,
    var(--rule) 52px,
    var(--rule) 55px,
    transparent 55px,
    transparent 104px
  );
  opacity: 0.92;
  pointer-events: none;
}

.page-shell::before {
  left: -3px;
}

.page-shell::after {
  right: -3px;
}

.skip-link {
  position: absolute;
  top: 10px;
  left: 10px;
  transform: translateY(-180%);
  padding: 8px 10px;
  background: var(--accent);
  color: var(--paper);
  border: 2px solid var(--rule);
  z-index: 5;
}

.skip-link:focus {
  transform: translateY(0);
}

.top-band {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding-bottom: 26px;
  border-bottom: 3px solid var(--rule);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  font-family: var(--font-display);
  font-size: 0.92rem;
}

.brand-left,
.brand-right {
  font-weight: 700;
}

.brand-logo {
  justify-self: start;
  display: inline-grid;
  grid-template-columns: 40px auto;
  align-items: center;
  gap: 10px;
  max-width: max-content;
  padding: 2px 6px 2px 2px;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  text-decoration: none;
}

.brand-logo img {
  width: 40px;
  height: 40px;
  display: block;
  flex: 0 0 40px;
  object-fit: cover;
  border: 2px solid var(--rule);
  background: var(--paper);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  image-rendering: auto;
}

.brand-logo span {
  letter-spacing: 0.1em;
}

.brand-logo:hover,
.brand-logo:focus-visible {
  color: var(--paper);
  background: var(--accent);
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.brand-logo:hover img,
.brand-logo:focus-visible img {
  border-color: var(--accent);
}

.brand-right {
  text-align: right;
}

.doc-code {
  justify-self: center;
  padding: 3px 8px;
  font-family: var(--font-display);
  font-weight: 700;
  border: 2px solid var(--rule);
  background: rgba(25, 118, 210, 0.08);
  white-space: nowrap;
}

.memo-grid {
  display: grid;
  grid-template-columns: minmax(120px, 180px) 1fr;
  gap: 0;
  margin: clamp(18px, 3vw, 34px) 0 22px;
  border-top: 2px solid var(--rule);
  border-left: 2px solid var(--rule);
}

.memo-label,
.memo-value {
  min-height: 42px;
  padding: 9px 12px;
  border-right: 2px solid var(--rule);
  border-bottom: 2px solid var(--rule);
}

.memo-label {
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-family: var(--font-display);
  font-size: 0.83rem;
  font-weight: 700;
  color: var(--muted);
  background: rgba(20, 40, 29, 0.045);
}

.memo-value {
  font-weight: 600;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(190px, 250px);
  gap: clamp(22px, 5vw, 56px);
  align-items: start;
  margin: 28px 0 42px;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(3rem, 6.8vw, 5.9rem);
  max-width: 12ch;
  text-transform: uppercase;
}

h2 {
  font-size: clamp(1.65rem, 3.8vw, 3rem);
  margin-top: 48px;
  padding-top: 15px;
  border-top: 3px solid var(--rule);
  text-transform: uppercase;
}

h3 {
  font-size: 1.08rem;
  margin-top: 26px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

p,
ul,
ol {
  max-width: 74ch;
}

p {
  margin: 14px 0;
}

ul,
ol {
  padding-left: 1.4rem;
}

li + li {
  margin-top: 8px;
}

.lede {
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.45;
  max-width: 62ch;
  font-weight: 600;
}

.stamp {
  justify-self: end;
  width: 100%;
  max-width: 250px;
  aspect-ratio: 1 / 0.78;
  border: 4px double var(--stamp);
  color: var(--stamp);
  display: grid;
  place-items: center;
  transform: rotate(-4deg);
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-weight: 700;
  text-align: center;
  font-size: clamp(1.1rem, 2.2vw, 1.55rem);
  background: rgba(25, 118, 210, 0.035);
}

.nav-ledger {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 3px solid var(--rule);
  border-left: 3px solid var(--rule);
  margin: 34px 0;
}

.nav-ledger a {
  display: block;
  padding: 16px 14px;
  min-height: 92px;
  color: var(--ink);
  border-right: 3px solid var(--rule);
  border-bottom: 3px solid var(--rule);
  text-decoration: none;
  background: rgba(255, 252, 220, 0.7);
}

.nav-ledger a:hover,
.nav-ledger a:focus-visible {
  outline: none;
  color: var(--paper);
  background: var(--accent);
}

.nav-ledger strong,
.nav-ledger span {
  display: block;
}

.nav-ledger strong {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.nav-ledger span {
  margin-top: 10px;
  font-size: 0.84rem;
}

.notice,
.paper-card {
  border: 3px solid var(--rule);
  padding: 18px;
  background: rgba(255, 252, 220, 0.82);
  box-shadow: 6px 6px 0 rgba(20, 40, 29, 0.18);
}

.notice {
  margin: 24px 0;
}

.paper-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin: 24px 0;
}

.kicker,
.section-number {
  display: inline-block;
  color: var(--accent);
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-size: 0.84rem;
  font-weight: 700;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.94rem;
}

.data-table th,
.data-table td {
  border: 2px solid var(--rule);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.data-table th {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: rgba(20, 40, 29, 0.06);
}

a {
  color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

a:hover,
a:focus-visible {
  color: var(--ink);
  background: rgba(25, 118, 210, 0.16);
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

code {
  padding: 0.12em 0.3em;
  border: 1px solid var(--rule);
  background: rgba(20, 40, 29, 0.055);
  font-family: var(--font-code);
  font-size: 0.92em;
}

hr {
  border: 0;
  border-top: 3px solid var(--rule);
  margin: 38px 0;
}

.footer-ledger {
  margin-top: 56px;
  padding-top: 18px;
  border-top: 3px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.site-nav {
  justify-self: end;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 14px;
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.82rem;
}

.site-nav a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--accent);
  background: transparent;
  border-bottom-color: var(--accent);
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.landing-hero {
  grid-template-columns: minmax(0, 1fr) minmax(240px, 300px);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
  margin-top: 28px;
}

.landing-hero > div {
  min-width: 0;
}

.landing-hero h1 {
  max-width: 11.5ch;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 18px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 18px;
  border: 3px solid var(--rule);
  box-shadow: 5px 5px 0 rgba(20, 40, 29, 0.26);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  text-decoration: none;
  line-height: 1.1;
}

.button:hover,
.button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  transform: translate(-1px, -1px);
}

.button-primary {
  background: var(--accent);
  color: var(--paper);
}

.button-primary:hover,
.button-primary:focus-visible {
  color: var(--paper);
  background: #0f5fab;
}

.button-secondary {
  background: rgba(255, 252, 220, 0.86);
}

.trust-ledger {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 18px 0 0;
  list-style: none;
  max-width: none;
}

.trust-ledger li {
  margin: 0;
  padding: 7px 10px;
  border: 2px solid var(--rule);
  background: rgba(20, 40, 29, 0.045);
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tester-ticket,
.requirements-card,
.github-card {
  border: 3px solid var(--rule);
  background:
    repeating-linear-gradient(0deg, transparent 0 24px, rgba(20, 40, 29, 0.04) 24px 25px),
    rgba(255, 252, 220, 0.9);
  box-shadow: 8px 8px 0 rgba(20, 40, 29, 0.2);
}

.tester-ticket {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  min-height: 0;
  padding: 22px;
  transform: rotate(1.5deg);
}

.tester-ticket::before {
  content: "";
  position: absolute;
  inset: 12px;
  border: 2px dashed rgba(20, 40, 29, 0.32);
  pointer-events: none;
}

.ticket-label,
.github-card span {
  color: var(--accent);
  font-family: var(--font-display);
  font-size: 0.83rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.tester-ticket strong {
  display: block;
  margin: 12px 0;
  color: var(--accent);
  font-family: var(--font-display);
  font-size: clamp(3rem, 5.6vw, 4.4rem);
  line-height: 0.9;
  text-transform: uppercase;
}

.tester-ticket p {
  margin-bottom: 22px;
  font-weight: 700;
}

.tester-ticket a {
  align-self: flex-start;
  padding: 7px 10px;
  border: 2px solid var(--rule);
  background: var(--accent);
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
}

.problem-section,
.privacy-section,
.oss-section,
.tester-section {
  display: grid;
  grid-template-columns: minmax(220px, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(20px, 4vw, 48px);
  align-items: start;
  margin: clamp(42px, 7vw, 78px) 0;
  padding-top: 24px;
  border-top: 3px solid var(--rule);
}

.problem-section h2,
.feature-section h2,
.tester-section h2,
.privacy-section h2,
.oss-section h2 {
  margin-top: 8px;
  padding-top: 0;
  border-top: 0;
}

.problem-copy,
.privacy-ledger {
  border-left: 3px solid var(--rule);
  padding-left: 22px;
}

.feature-section {
  margin: clamp(42px, 7vw, 78px) 0;
  padding-top: 24px;
  border-top: 3px solid var(--rule);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: stretch;
  gap: 18px;
  margin-top: 24px;
}

.feature-card {
  display: flex;
  min-height: 210px;
  height: 100%;
  flex-direction: column;
  justify-content: flex-start;
}

.feature-card h3 {
  margin-top: 0;
}

.tester-section {
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.75fr);
  padding: clamp(22px, 4vw, 36px);
  background: rgba(25, 118, 210, 0.07);
  border: 3px solid var(--rule);
  box-shadow: 8px 8px 0 rgba(20, 40, 29, 0.18);
}

.tester-main .lede {
  margin-top: 16px;
}

.requirements-card {
  padding: 20px;
}

.requirements-card h3 {
  margin-top: 0;
}

.requirements-card ul,
.privacy-ledger ul {
  margin-top: 0;
}

.fine-print {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--muted);
}

.text-link {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.github-card {
  display: block;
  padding: 22px;
  color: var(--ink);
  text-decoration: none;
}

.github-card strong,
.github-card em {
  display: block;
}

.github-card strong {
  margin: 16px 0 8px;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 3rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
  overflow-wrap: anywhere;
}

.github-card em {
  font-style: normal;
  color: var(--muted);
  font-weight: 700;
}

.github-card:hover,
.github-card:focus-visible {
  color: var(--paper);
  background: var(--accent);
}

.github-card:hover em,
.github-card:focus-visible em,
.github-card:hover span,
.github-card:focus-visible span {
  color: var(--paper);
}

.final-cta {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
}

.final-cta strong {
  font-family: var(--font-display);
  font-size: 1.35rem;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.language-switch a {
  display: inline-block;
  padding: 3px 8px;
  border: 2px solid var(--rule);
  color: var(--ink);
  background: rgba(255, 252, 220, 0.72);
  text-decoration: none;
}

.language-switch a:hover,
.language-switch a:focus-visible {
  color: var(--paper);
  background: var(--accent);
}

html:lang(ja) body {
  font-family: "Public Sans", "Hiragino Sans", "Yu Gothic", "YuGothic", "Noto Sans CJK JP", "Noto Sans JP", sans-serif;
  line-height: 1.72;
}

html:lang(ja) h1,
html:lang(ja) h2,
html:lang(ja) h3 {
  letter-spacing: -0.02em;
  line-height: 1.08;
}

html:lang(ja) h1 {
  font-size: clamp(2.45rem, 6.4vw, 5.15rem);
  max-width: 13ch;
}

html:lang(ja) .kicker,
html:lang(ja) .section-number,
html:lang(ja) .site-nav,
html:lang(ja) .button,
html:lang(ja) .footer-ledger,
html:lang(ja) .memo-label,
html:lang(ja) .nav-ledger strong,
html:lang(ja) .trust-ledger li {
  letter-spacing: 0.04em;
}

html:lang(ja) .feature-card {
  min-height: 240px;
}

@media (max-width: 960px) {
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .landing-hero,
  .problem-section,
  .privacy-section,
  .oss-section,
  .tester-section,
  .final-cta {
    grid-template-columns: 1fr;
  }

  .landing-hero {
    gap: 22px;
    margin-top: 32px;
  }

  .landing-hero h1 {
    max-width: 12ch;
  }

  .tester-ticket {
    transform: none;
  }

  .tester-ticket strong {
    font-size: clamp(2.55rem, 10vw, 3.6rem);
  }

  .problem-copy,
  .privacy-ledger {
    border-left: 0;
    padding-left: 0;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 15px;
  }

  .page-shell {
    width: calc(100% - 16px);
    margin: 8px auto;
    padding: 18px;
    box-shadow: 6px 6px 0 var(--shadow);
  }

  .page-shell::before,
  .page-shell::after {
    display: none;
  }

  .top-band {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .brand-right,
  .doc-code,
  .site-nav {
    justify-self: start;
    text-align: left;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .memo-grid {
    grid-template-columns: minmax(104px, 0.4fr) minmax(0, 1fr);
    margin: 16px 0 20px;
  }

  .memo-label,
  .memo-value {
    min-height: 0;
    padding: 8px 10px;
  }

  .memo-label {
    font-size: 0.75rem;
    letter-spacing: 0.06em;
  }

  .memo-value {
    font-size: 0.92rem;
  }

  .hero,
  .paper-card-grid,
  .nav-ledger,
  .footer-ledger,
  .feature-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: clamp(2.35rem, 10.8vw, 3.55rem);
    max-width: 100%;
  }

  html:lang(ja) h1 {
    font-size: clamp(2.1rem, 9.8vw, 3.35rem);
    max-width: 100%;
  }

  .lede {
    font-size: 1.04rem;
    line-height: 1.55;
  }

  .button {
    width: 100%;
    padding-inline: 14px;
    letter-spacing: 0.05em;
  }

  .site-nav {
    gap: 10px 14px;
  }

  .trust-ledger li {
    flex: 1 1 calc(50% - 8px);
    text-align: center;
    font-size: 0.76rem;
  }

  .tester-ticket {
    padding: 18px;
  }

  .tester-ticket p {
    margin-bottom: 16px;
  }

  .feature-card {
    min-height: 0;
  }

  .tester-section {
    padding: 18px;
  }

  .stamp {
    justify-self: start;
    max-width: 190px;
  }
}

@media print {
  html,
  body {
    background: var(--paper);
  }

  .page-shell {
    width: 100%;
    min-height: auto;
    margin: 0;
    border: 0;
    box-shadow: none;
  }

  .nav-ledger,
  .skip-link {
    display: none;
  }
}