:root {
  --color-bg: #FBF5E6;
  --color-panel: #FFFBF0;
  --color-panel-alt: #F2E9D4;
  --color-border: #E2D5B8;
  --color-accent: #1D5C8F;
  --color-accent-dark: #14456E;
  --color-text: #2B2118;
  --color-muted: #7A6B55;
  --color-success: #3E7C4F;
  --color-warn: #B07A1F;
  --color-error: #B3402E;
  --color-white: #FFFFFF;
  --color-transparent: transparent;
  --color-grain-a: rgba(43, 33, 24, 0.05);
  --color-grain-b: rgba(29, 92, 143, 0.028);
  --color-shadow-soft: rgba(43, 33, 24, 0.16);
  --color-shadow-far: rgba(43, 33, 24, 0.1);
  --color-shadow-accent: rgba(29, 92, 143, 0.22);
  --color-overlay: rgba(43, 33, 24, 0.35);
  --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", Menlo, monospace;
  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 26px;
  --radius-pill: 999px;
  --shadow-card: 0 2px 5px var(--color-shadow-soft), 0 22px 40px -22px var(--color-shadow-soft);
  --shadow-raised: 0 3px 8px var(--color-shadow-soft), 0 30px 58px -30px var(--color-shadow-far);
  --shadow-accent: 0 2px 6px var(--color-shadow-accent), 0 16px 32px -12px var(--color-shadow-accent);
  --content-width: 1280px;
  --reading-width: 780px;
  --header-height: 68px;
  --gutter: 32px;
  --section-space: 112px;
  --focus-size: 2px;
  --transition-fast: 150ms ease;
  --transition-normal: 380ms ease;
  --toc-offset: 94px;
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
  background: var(--color-bg);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  z-index: 0;
  inset: 0;
  content: "";
  pointer-events: none;
  background-image:
    radial-gradient(var(--color-grain-a) 1px, var(--color-transparent) 1px),
    radial-gradient(var(--color-grain-b) 1px, var(--color-transparent) 1px);
  background-position: 0 0, 4px 7px;
  background-size: 7px 7px, 13px 13px;
  opacity: 0.55;
}

header,
main,
footer {
  position: relative;
  z-index: 1;
}

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

img {
  height: auto;
}

svg {
  flex-shrink: 0;
}

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

button {
  border: 0;
  cursor: pointer;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

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

a,
button,
summary,
input,
select,
textarea,
[role="tab"] {
  -webkit-tap-highlight-color: var(--color-transparent);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role="tab"]:focus-visible {
  outline: var(--focus-size) solid var(--color-accent);
  outline-offset: 3px;
}

p,
ul,
ol,
blockquote,
pre,
table {
  margin-top: 0;
  margin-bottom: 1.25em;
}

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

li + li {
  margin-top: 0.42em;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  text-wrap: balance;
}

h1 {
  max-width: 100%;
  margin-bottom: 24px;
  font-size: clamp(52px, 5vw, 72px);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.12;
}

h2 {
  margin-bottom: 22px;
  font-size: clamp(34px, 3.6vw, 52px);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.16;
}

h3 {
  margin-bottom: 14px;
  font-size: clamp(22px, 2vw, 30px);
  font-weight: 800;
  line-height: 1.3;
}

h4 {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 800;
}

strong {
  font-weight: 800;
}

small {
  font-size: 0.84em;
}

hr {
  height: 1px;
  margin: 40px 0;
  border: 0;
  background: var(--color-border);
}

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

code {
  overflow-wrap: anywhere;
  border-radius: var(--radius-xs);
  background: var(--color-panel-alt);
  padding: 0.12em 0.38em;
  font-size: 0.9em;
}

pre {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel-alt);
  padding: 20px;
  color: var(--color-text);
  font: 14px/1.65 var(--font-mono);
  -webkit-overflow-scrolling: touch;
}

pre code {
  overflow-wrap: normal;
  background: none;
  padding: 0;
}

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

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

.reading-wrap {
  width: 100%;
  max-width: calc(var(--reading-width) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.section-compact {
  padding-top: 72px;
  padding-bottom: 72px;
}

.section-alt {
  border-block: 1px solid var(--color-border);
  background: var(--color-panel-alt);
}

.section-head {
  max-width: 780px;
  margin-bottom: 44px;
}

.eyebrow {
  margin-bottom: 12px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.lead {
  max-width: 720px;
  color: var(--color-muted);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.75;
}

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

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

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

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

.card {
  padding: 28px;
  box-shadow: var(--shadow-card);
}

.panel {
  padding: 32px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.badge,
.kicker,
.tag {
  display: inline-flex;
  min-height: 28px;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  padding: 4px 13px;
  color: var(--color-muted);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.35;
}

.badge::before,
.kicker-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 7px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.tag {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tag::before {
  content: none;
}

.badge-accent {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn {
  display: inline-flex;
  min-width: 24px;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: 1.5px solid var(--color-transparent);
  border-radius: var(--radius-pill);
  padding: 11px 27px;
  color: var(--color-text);
  font-size: 15px;
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition:
    transform var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn-primary:hover {
  background: var(--color-accent-dark);
  color: var(--color-white);
}

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

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

.btn-outline {
  border-color: var(--color-accent);
  background: var(--color-transparent);
  color: var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-small {
  min-height: 40px;
  padding: 8px 20px;
  font-size: 14px;
}

.btn[aria-disabled="true"],
.btn:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.site-head {
  position: relative;
  z-index: 80;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.head-in {
  display: flex;
  min-height: var(--header-height);
  align-items: center;
  gap: 30px;
}

.brand {
  display: inline-flex;
  min-height: 44px;
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  text-decoration: none;
}

.brand:hover {
  color: var(--color-text);
}

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

.brand-en {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.brand-local {
  position: relative;
  top: 1px;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 600;
}

.desktop-nav {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 22px;
}

.desktop-nav a {
  position: relative;
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 550;
  text-decoration: none;
  white-space: nowrap;
}

.desktop-nav a:hover,
.desktop-nav a.is-active {
  color: var(--color-text);
}

.desktop-nav a.is-active {
  font-weight: 800;
}

.desktop-nav a.is-active::after {
  position: absolute;
  right: 0;
  bottom: 7px;
  left: 0;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

.head-tools {
  display: flex;
  margin-left: auto;
  align-items: center;
  gap: 12px;
}

.login-button {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius-pill);
  padding: 7px 19px;
  color: var(--color-accent);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
}

.login-button:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

.language-menu {
  position: relative;
}

.language-trigger {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--color-transparent);
  color: var(--color-muted);
  font-size: 13px;
}

.language-popover {
  position: absolute;
  z-index: 95;
  top: calc(100% + 8px);
  right: 0;
  width: 164px;
  margin: 0;
  padding: 7px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  box-shadow: var(--shadow-raised);
  list-style: none;
}

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

.language-popover li {
  margin: 0;
}

.language-popover a {
  display: flex;
  min-height: 42px;
  align-items: center;
  border-radius: var(--radius-xs);
  padding: 8px 10px;
  color: var(--color-muted);
  font-size: 14px;
  text-decoration: none;
}

.language-popover a:hover,
.language-popover a[aria-current="true"] {
  background: var(--color-panel-alt);
  color: var(--color-text);
}

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  background: var(--color-panel-alt);
  color: var(--color-text);
}

.menu-toggle svg {
  width: 22px;
  height: 22px;
}

.mobile-nav {
  display: none;
}

.mobile-nav.is-open {
  display: block;
}

.mobile-nav-panel {
  position: absolute;
  z-index: 93;
  top: 100%;
  right: 0;
  left: 0;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel);
  padding: 10px var(--gutter) 18px;
  box-shadow: var(--shadow-raised);
}

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  border-bottom: 1px dashed var(--color-border);
  padding: 11px 4px;
  color: var(--color-muted);
  font-weight: 700;
  text-decoration: none;
}

.mobile-nav a.is-active,
.mobile-nav a:hover {
  color: var(--color-accent);
}

.mobile-language-title {
  margin: 16px 4px 5px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

.nav-veil {
  position: fixed;
  z-index: 70;
  inset: var(--header-height) 0 0;
  background: var(--color-overlay);
}

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

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-panel-alt);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr 0.8fr;
  gap: 50px;
  padding-top: 70px;
  padding-bottom: 54px;
}

.footer-brand p {
  max-width: 360px;
  margin-top: 18px;
  color: var(--color-muted);
}

.footer-heading {
  margin-bottom: 16px;
  font-size: 14px;
  font-weight: 900;
}

.footer-links {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links li {
  margin: 0;
}

.footer-links a {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  color: var(--color-muted);
  font-size: 14px;
  text-decoration: none;
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-top: 1px solid var(--color-border);
  padding-top: 22px;
  padding-bottom: 24px;
  color: var(--color-muted);
  font-size: 13px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.footer-legal a {
  min-height: 24px;
  color: var(--color-muted);
  text-decoration: none;
}

.reveal {
  transition:
    opacity var(--transition-normal),
    transform var(--transition-normal);
}

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

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

.prose {
  min-width: 0;
  color: var(--color-text);
}

.prose h2 {
  margin-top: 2.1em;
  scroll-margin-top: var(--toc-offset);
}

.prose h3 {
  margin-top: 1.7em;
}

.prose a {
  font-weight: 700;
}

.prose img {
  border-radius: var(--radius-md);
}

.prose ol.steps {
  padding: 0;
  counter-reset: guide-step;
  list-style: none;
}

.prose ol.steps > li {
  position: relative;
  min-height: 44px;
  padding-left: 52px;
  counter-increment: guide-step;
}

.prose ol.steps > li::before {
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-white);
  content: counter(guide-step);
  font: 700 13px var(--font-mono);
}

@media (max-width: 1120px) {
  .desktop-nav {
    gap: 14px;
  }

  .desktop-nav a {
    font-size: 13px;
  }

  .brand-local {
    display: none;
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  :root {
    --gutter: 24px;
    --section-space: 88px;
  }

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

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

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

  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: clamp(32px, 9.5vw, 40px);
    line-height: 1.13;
  }

  h2 {
    font-size: clamp(28px, 7.5vw, 38px);
  }

  .section-head {
    margin-bottom: 34px;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 18px;
    --section-space: 68px;
  }

  .wrap,
  .reading-wrap {
    padding-inline: var(--gutter);
  }

  .head-in {
    gap: 8px;
  }

  .brand {
    gap: 7px;
  }

  .brand-logo {
    width: 28px;
    height: 28px;
  }

  .brand-en {
    font-size: 17px;
  }

  .login-button {
    min-height: 36px;
    padding-inline: 14px;
  }

  .mobile-nav-panel {
    padding-inline: var(--gutter);
  }

  .card-grid,
  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-grid {
    gap: 34px;
  }

  .card,
  .panel {
    padding: 22px;
  }

  .button-row {
    align-items: stretch;
    flex-direction: column;
  }

  .button-row .btn {
    width: 100%;
  }

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

  .decor-absolute,
  [data-parallax-decor] {
    max-width: 100%;
  }
}

@media (max-width: 380px) {
  :root {
    --gutter: 16px;
  }

  .brand-en {
    font-size: 16px;
  }

  .login-button {
    padding-inline: 12px;
    font-size: 13px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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