:root {
  --color-page: #F9F1DF;
  --color-panel: #FFFCF4;
  --color-panel-soft: #F1E6CC;
  --color-panel-warm: #FBF5E7;
  --color-line: #E2D5B4;
  --color-accent: #0E7263;
  --color-accent-dark: #0A5548;
  --color-text: #2A2119;
  --color-muted: #6F604A;
  --color-success: #3A7D44;
  --color-warning: #C08A1E;
  --color-error: #B3382C;
  --color-amber-light: #F0B65C;
  --color-amber: #E8A23D;
  --color-amber-dark: #D08A2B;
  --color-coral: #E3684A;
  --color-coral-dark: #C9553B;
  --color-spark: #FFF4DC;
  --color-flag-red: #CE3B34;
  --color-flag-blue: #31589F;
  --color-flag-white: #FFFFFF;
  --color-overlay: rgba(42, 33, 25, .36);
  --color-dot: rgba(111, 96, 74, .15);
  --color-ink-06: rgba(42, 33, 25, .06);
  --color-ink-10: rgba(42, 33, 25, .10);
  --color-ink-16: rgba(42, 33, 25, .16);
  --color-accent-12: rgba(14, 114, 99, .12);
  --color-accent-22: rgba(14, 114, 99, .22);
  --font-display: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', -apple-system, 'PingFang SC', 'Hiragino Sans', 'Malgun Gothic', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', -apple-system, 'PingFang SC', 'Hiragino Sans', 'Malgun Gothic', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --radius-small: 8px;
  --radius-button: 9px;
  --radius-medium: 14px;
  --radius-pill: 999px;
  --shadow-card: 0 2px 10px var(--color-ink-06);
  --shadow-lift: 0 8px 22px var(--color-ink-10);
  --shadow-button: 0 4px 14px var(--color-accent-22);
  --content-width: 1280px;
  --gutter: 32px;
  --header-height: 64px;
  --section-space: clamp(56px, 8vw, 104px);
  --toc-offset: 82px;
  --focus-width: 2px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  overflow-x: clip;
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
}

html.nav-open {
  overflow: hidden;
}

body {
  margin: 0;
  min-width: 0;
  overflow-x: clip;
  background: var(--color-page);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  opacity: .48;
  background-image: radial-gradient(var(--color-dot) 1px, transparent 1.2px);
  background-size: 28px 28px;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}

button,
input,
select,
textarea {
  color: inherit;
  font: inherit;
}

button,
summary {
  cursor: pointer;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  color: var(--color-accent-dark);
}

:where(a, button, input, select, textarea, summary, [role="tab"]):focus-visible {
  outline: var(--focus-width) solid var(--color-accent);
  outline-offset: 2px;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure,
blockquote {
  margin-top: 0;
}

h1,
h2,
h3,
h4 {
  color: var(--color-text);
  font-family: var(--font-display);
  text-wrap: balance;
}

h1,
.hero-title {
  margin-bottom: 18px;
  font-size: clamp(52px, 5.1vw, 72px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.12;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(30px, 3.2vw, 46px);
  font-weight: 800;
  letter-spacing: -.015em;
  line-height: 1.2;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(20px, 2vw, 28px);
  line-height: 1.3;
}

p {
  margin-bottom: 1.1em;
}

strong {
  font-weight: 700;
}

code,
kbd,
pre {
  font-family: var(--font-mono);
}

code {
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  background: var(--color-text);
  color: var(--color-panel);
  -webkit-overflow-scrolling: touch;
}

.no-break {
  white-space: nowrap;
}

.text-accent,
.hero-title .highlight {
  color: var(--color-accent);
}

.text-muted {
  color: var(--color-muted);
}

.wrap {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
}

.section-head {
  max-width: 760px;
  margin-bottom: 36px;
}

.eyebrow {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  gap: 8px;
  padding: 4px 12px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-panel-warm);
  color: var(--color-muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
}

.eyebrow-dot,
.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--color-accent);
}

.panel,
.card {
  min-width: 0;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-medium);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.card {
  padding: 24px;
  transition: transform .18s ease, box-shadow .18s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.btn,
.button {
  display: inline-flex;
  min-width: 24px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-button);
  cursor: pointer;
  font-weight: 700;
  line-height: 1.2;
  transition: transform .15s ease, color .15s ease, background-color .15s ease, border-color .15s ease;
}

.btn svg,
.button svg {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-panel);
  box-shadow: var(--shadow-button);
}

.btn-primary:hover {
  transform: translateY(-1px);
  background: var(--color-accent-dark);
  color: var(--color-panel);
}

.btn-secondary {
  border-color: var(--color-line);
  background: var(--color-panel);
  color: var(--color-text);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-small {
  min-height: 36px;
  padding: 7px 15px;
  font-size: 13px;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.badge,
.tag {
  display: inline-flex;
  max-width: 100%;
  min-height: 26px;
  align-items: center;
  padding: 3px 10px;
  overflow: hidden;
  border-radius: var(--radius-pill);
  background: var(--color-accent-12);
  color: var(--color-accent-dark);
  font-size: 12px;
  font-weight: 700;
}

.reveal {
  transition: opacity .55s ease, transform .55s ease;
}

.reveal.pending {
  opacity: 0;
  transform: translateY(16px);
}

.reveal.shown {
  opacity: 1;
  transform: none;
}

.site-header {
  position: relative;
  z-index: 100;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-page);
}

.header-inner {
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  gap: 24px;
}

.brand-link,
.footer-brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 9px;
  color: var(--color-text);
}

.brand-logo {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
}

.brand-word {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
}

.brand-local {
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 500;
}

.desktop-nav {
  margin-inline: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  display: flex;
  min-height: 36px;
  align-items: center;
  gap: 6px;
  padding: 7px 9px;
  border-radius: var(--radius-small);
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 600;
}

.nav-link svg {
  width: 15px;
  height: 15px;
  flex: 0 0 auto;
}

.nav-link:hover {
  background: var(--color-panel-warm);
  color: var(--color-text);
}

.nav-link[aria-current="page"] {
  background: var(--color-accent-12);
  color: var(--color-accent);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 9px;
}

.login-link {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  padding: 7px 17px;
  border-radius: var(--radius-small);
  background: var(--color-accent);
  color: var(--color-panel);
  font-size: 13px;
  font-weight: 700;
}

.login-link:hover {
  background: var(--color-accent-dark);
  color: var(--color-panel);
}

.language-control {
  position: relative;
}

.language-button {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  gap: 5px;
  padding: 6px 8px;
  border: 0;
  border-radius: var(--radius-small);
  background: transparent;
  color: var(--color-muted);
  font-size: 13px;
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 110;
  width: 156px;
  padding: 6px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  background: var(--color-panel);
  box-shadow: var(--shadow-lift);
}

.language-menu[hidden] {
  display: none;
}

.language-menu a {
  display: flex;
  min-height: 40px;
  align-items: center;
  padding: 8px 10px;
  border-radius: var(--radius-small);
  color: var(--color-text);
  font-size: 13px;
}

.language-menu a:hover,
.language-menu a[aria-current="true"] {
  background: var(--color-accent-12);
  color: var(--color-accent);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-small);
  background: var(--color-panel);
}

.menu-toggle svg {
  width: 21px;
  height: 21px;
}

.mobile-nav {
  display: none;
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-veil {
  display: none;
}

.site-footer {
  margin-top: var(--section-space);
  border-top: 1px solid var(--color-line);
  background: var(--color-panel-soft);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1.15fr .9fr;
  gap: 36px;
  padding-top: 52px;
  padding-bottom: 42px;
}

.footer-copy {
  max-width: 32em;
  margin-top: 16px;
  color: var(--color-muted);
  font-size: 14px;
}

.footer-heading {
  margin-bottom: 14px;
  font-size: 13px;
  letter-spacing: .08em;
}

.footer-links {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  color: var(--color-muted);
  font-size: 13px;
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 18px;
  padding-bottom: 22px;
  border-top: 1px solid var(--color-line);
  color: var(--color-muted);
  font-size: 12px;
}

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.hero,
.decorated-section {
  overflow-x: clip;
}

.prose {
  max-width: 780px;
}

.prose h2,
.prose h3 {
  scroll-margin-top: var(--toc-offset);
}

.prose a {
  text-decoration: underline;
  text-underline-offset: .15em;
}

.prose ol,
.prose ul {
  padding-left: 1.4em;
}

.prose img {
  height: auto;
  border-radius: var(--radius-small);
}

@media (max-width: 1160px) {
  .desktop-nav .nav-link span {
    display: none;
  }

  .desktop-nav .nav-link {
    min-width: 36px;
    justify-content: center;
  }
}

@media (max-width: 860px) {
  :root {
    --gutter: 20px;
  }

  h1,
  .hero-title {
    font-size: clamp(34px, 7.8vw, 40px);
  }

  .desktop-nav,
  .language-control {
    display: none;
  }

  .header-tools {
    margin-left: auto;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .mobile-veil.is-open {
    position: fixed;
    inset: var(--header-height) 0 0;
    z-index: 89;
    display: block;
    border: 0;
    background: var(--color-overlay);
  }

  .mobile-nav.is-open {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    z-index: 91;
    display: block;
    max-height: calc(100dvh - var(--header-height));
    padding: 10px var(--gutter) 18px;
    overflow-y: auto;
    border-bottom: 1px solid var(--color-line);
    background: var(--color-panel);
    overscroll-behavior: contain;
  }

  .mobile-nav ul {
    display: grid;
    gap: 3px;
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .mobile-nav a {
    display: flex;
    width: 100%;
    min-height: 46px;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-small);
    color: var(--color-text);
  }

  .mobile-nav a[aria-current="page"] {
    background: var(--color-accent-12);
    color: var(--color-accent);
  }

  .mobile-nav svg {
    width: 18px;
    height: 18px;
    flex: 0 0 auto;
  }

  .mobile-language-links {
    margin-top: 9px !important;
    padding-top: 9px !important;
    border-top: 1px solid var(--color-line);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
    --section-space: 56px;
  }

  body,
  main,
  section,
  article,
  .wrap,
  .card,
  .panel,
  .prose,
  .grid > * {
    min-width: 0;
  }

  h1,
  .hero-title {
    font-size: clamp(28px, 9.5vw, 38px);
    line-height: 1.14;
  }

  h2 {
    font-size: clamp(27px, 8vw, 34px);
  }

  .brand-local {
    display: none;
  }

  .header-inner {
    gap: 10px;
  }

  .login-link {
    padding-inline: 13px;
  }

  .button-row .btn {
    flex: 1 1 145px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .tilt,
  [class*="tilt-"] {
    transform: none;
  }

  .decor-orb,
  .decor-disc,
  .watermark {
    display: none;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation: none !important;
    transition: none !important;
  }

  .reveal,
  .reveal.pending {
    opacity: 1;
    transform: none;
  }
}