:root {
  --color-bg: #FAF7ED;
  --color-panel: #FFFDF6;
  --color-panel-soft: #EEF3F0;
  --color-border: #9BAEAA;
  --color-border-soft: #CAD5D1;
  --color-accent: #C47B08;
  --color-accent-dark: #815006;
  --color-text: #243331;
  --color-text-muted: #657572;
  --color-success: #008F91;
  --color-warning: #C47B08;
  --color-error: #D95E4C;
  --color-white: #FFFFFF;
  --color-transparent: transparent;
  --color-paper-glass: rgba(255, 253, 246, 0.88);
  --color-panel-glass: rgba(238, 243, 240, 0.72);
  --color-grid: rgba(101, 117, 114, 0.10);
  --color-grid-strong: rgba(101, 117, 114, 0.18);
  --color-shadow: rgba(36, 51, 49, 0.14);
  --color-shadow-soft: rgba(36, 51, 49, 0.07);
  --color-amber-soft: rgba(196, 123, 8, 0.13);
  --color-teal-soft: rgba(0, 143, 145, 0.12);
  --color-coral-soft: rgba(217, 94, 76, 0.12);
  --color-glass: rgba(172, 211, 206, 0.29);
  --color-glass-edge: rgba(75, 119, 115, 0.84);
  --color-glass-light: rgba(255, 255, 255, 0.78);
  --color-incoming: #D6E8E4;
  --font-display: "Inter", "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", sans-serif;
  --font-body: "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --radius-logo: 11px;
  --radius-small: 5px;
  --radius-medium: 12px;
  --radius-large: 20px;
  --radius-pill: 999px;
  --header-height: 72px;
  --page-width: 1360px;
  --content-width: 1120px;
  --reading-width: 780px;
  --gutter: clamp(16px, 4vw, 32px);
  --line-thin: 1px;
  --line-medium: 2px;
  --shadow-paper: 0 24px 70px var(--color-shadow-soft);
  --shadow-control: 0 10px 26px var(--color-shadow);
  --transition-fast: 160ms ease;
  --transition-reveal: 560ms cubic-bezier(0.2, 0.72, 0.2, 1);
}

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

html {
  width: 100%;
  min-width: 0;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
}

html.nav-open {
  overflow: hidden;
}

body {
  width: 100%;
  min-width: 0;
  min-height: 100%;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

img {
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

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

button,
select {
  cursor: pointer;
}

ul,
ol {
  padding-left: 1.35em;
}

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

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  line-height: 1.16;
  text-wrap: balance;
}

h1 {
  font-size: clamp(42px, 5.2vw, 72px);
  font-weight: 770;
  letter-spacing: -0.055em;
}

h2 {
  margin-bottom: 1.1rem;
  font-size: clamp(30px, 3.5vw, 48px);
  font-weight: 690;
  letter-spacing: -0.04em;
}

h3 {
  margin-bottom: 0.75rem;
  font-size: clamp(21px, 2vw, 27px);
  font-weight: 700;
  letter-spacing: -0.025em;
}

h4 {
  margin-bottom: 0.55rem;
  font-size: 18px;
  font-weight: 720;
}

strong {
  font-weight: 720;
}

small {
  font-size: 0.82em;
}

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

:not(pre) > code {
  padding: 0.12em 0.35em;
  border: var(--line-thin) solid var(--color-border-soft);
  border-radius: var(--radius-small);
  background: var(--color-panel-soft);
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  border: var(--line-thin) solid var(--color-border);
  border-left: 4px solid var(--color-success);
  border-radius: var(--radius-small);
  color: var(--color-panel);
  background: var(--color-text);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  overscroll-behavior-inline: contain;
  -webkit-overflow-scrolling: touch;
}

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

hr {
  height: var(--line-thin);
  margin: 2.5rem 0;
  border: 0;
  background: var(--color-border-soft);
}

::selection {
  color: var(--color-text);
  background: var(--color-amber-soft);
}

:focus-visible {
  outline: var(--line-medium) solid var(--color-success);
  outline-offset: 3px;
}

.wrap,
.page-shell,
.header-inner,
.footer-inner {
  width: 100%;
  max-width: var(--page-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

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

.section,
.sec {
  position: relative;
  padding-top: clamp(64px, 8vw, 116px);
  padding-bottom: clamp(64px, 8vw, 116px);
  overflow-x: clip;
}

.section-soft {
  background: var(--color-panel-soft);
}

.eyebrow {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 28px;
  height: var(--line-medium);
  flex-shrink: 0;
  background: var(--color-accent);
  content: "";
}

.lead {
  max-width: 740px;
  color: var(--color-text-muted);
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.8;
}

.mono-label {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.button,
.hero-button {
  min-height: 46px;
  padding: 0 20px;
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-small);
  font-size: 14px;
  font-weight: 730;
  line-height: 1.25;
  text-align: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast), color var(--transition-fast);
}

.button:hover,
.hero-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-control);
}

.button:active,
.hero-button:active {
  transform: translateY(0);
}

.button svg,
.hero-button svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: var(--line-medium);
  stroke-linecap: round;
  stroke-linejoin: round;
}

.button-primary {
  border-color: var(--color-accent);
  color: var(--color-panel);
  background: var(--color-accent);
  box-shadow: 0 10px 25px var(--color-amber-soft);
}

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

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

.button-quiet {
  border-color: var(--color-border-soft);
  color: var(--color-text-muted);
  background: var(--color-transparent);
}

.button[disabled],
.button.is-disabled {
  cursor: not-allowed;
  opacity: 0.48;
  transform: none;
  box-shadow: none;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.panel,
.paper-card {
  min-width: 0;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-panel);
  box-shadow: var(--shadow-paper);
}

.panel {
  padding: clamp(22px, 4vw, 38px);
}

.paper-card {
  position: relative;
  padding: 24px;
}

.paper-card::before {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 7px;
  height: 7px;
  border-radius: var(--radius-pill);
  background: var(--color-success);
  content: "";
}

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

.card-grid > *,
.split-grid > *,
.footer-grid > * {
  min-width: 0;
}

.split-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(28px, 6vw, 80px);
  align-items: start;
}

.tilt,
.paper-tilt {
  transform: rotate(-0.45deg);
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  border: var(--line-thin) solid var(--color-border);
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  background: var(--color-panel);
  font-size: 14px;
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  border-bottom: var(--line-thin) solid var(--color-border-soft);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  color: var(--color-text-muted);
  background: var(--color-panel-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity var(--transition-reveal), transform var(--transition-reveal);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  border-bottom: var(--line-thin) solid var(--color-border-soft);
  background: var(--color-paper-glass);
  backdrop-filter: blur(16px);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
}

.brand-mark {
  width: 39px;
  height: 39px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  overflow: hidden;
  border: var(--line-thin) solid var(--color-glass-edge);
  border-radius: var(--radius-logo);
  background: var(--color-panel-soft);
  box-shadow: 0 7px 18px var(--color-shadow);
}

.brand-mark img {
  width: 39px;
  height: 39px;
}

.brand-copy {
  min-width: 0;
  display: grid;
  gap: 3px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 760;
  line-height: 1;
  letter-spacing: -0.025em;
  white-space: nowrap;
}

.brand-subtitle {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 9px;
  line-height: 1;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}

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

.main-nav {
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 4px;
  border: var(--line-thin) solid var(--color-border-soft);
  border-radius: var(--radius-pill);
  background: var(--color-panel-soft);
}

.main-nav a {
  min-height: 34px;
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1;
  white-space: nowrap;
  transition: color var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.main-nav a:hover {
  color: var(--color-text);
  background: var(--color-panel);
  transform: translateY(-1px);
}

.main-nav a[aria-current="page"] {
  color: var(--color-panel);
  background: var(--color-text);
  box-shadow: 0 5px 14px var(--color-shadow);
}

.header-tools {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.language-control {
  position: relative;
}

.language-button {
  min-height: 38px;
  padding: 0 13px;
  border: var(--line-thin) solid var(--color-border-soft);
  border-radius: var(--radius-small);
  color: var(--color-text-muted);
  background: var(--color-panel);
  font-size: 13px;
  white-space: nowrap;
}

.language-menu {
  position: absolute;
  top: calc(100% + 9px);
  right: 0;
  z-index: 65;
  width: 168px;
  padding: 6px;
  display: none;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-panel);
  box-shadow: var(--shadow-control);
}

.language-control.is-open .language-menu {
  display: grid;
}

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

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

.menu-toggle {
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  display: none;
  place-items: center;
  border: var(--line-thin) solid var(--color-border-soft);
  border-radius: var(--radius-small);
  background: var(--color-panel);
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  width: 19px;
  height: var(--line-medium);
  display: block;
  background: var(--color-text);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.menu-toggle-lines {
  position: relative;
}

.menu-toggle-lines::before,
.menu-toggle-lines::after {
  position: absolute;
  left: 0;
  content: "";
}

.menu-toggle-lines::before {
  top: -6px;
}

.menu-toggle-lines::after {
  top: 6px;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines {
  background: var(--color-transparent);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::before {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::after {
  transform: translateY(-6px) rotate(-45deg);
}

.mobile-nav {
  position: fixed;
  top: var(--header-height);
  right: 0;
  left: 0;
  z-index: 60;
  max-height: calc(100dvh - var(--header-height));
  padding: 12px var(--gutter) 22px;
  display: none;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-bottom: var(--line-thin) solid var(--color-border);
  background: var(--color-panel);
  box-shadow: var(--shadow-control);
}

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

.mobile-nav-list,
.mobile-language-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.mobile-nav-list a,
.mobile-language-list a {
  width: 100%;
  min-height: 48px;
  padding: 11px 12px;
  display: flex;
  align-items: center;
  border-bottom: var(--line-thin) solid var(--color-border-soft);
  color: var(--color-text-muted);
}

.mobile-nav-list a[aria-current="page"],
.mobile-language-list a[aria-current="true"] {
  color: var(--panel);
  color: var(--color-panel);
  background: var(--color-text);
}

.mobile-language-title {
  margin: 18px 12px 5px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
}

.nav-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 40;
  display: none;
  border: 0;
  background: var(--color-shadow);
}

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

.site-footer {
  position: relative;
  overflow-x: clip;
  border-top: var(--line-thin) solid var(--color-border);
  background: var(--color-panel-soft);
}

.site-footer::before {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-grid) var(--line-thin), var(--color-transparent) var(--line-thin)),
    linear-gradient(90deg, var(--color-grid) var(--line-thin), var(--color-transparent) var(--line-thin));
  background-size: 30px 30px;
  content: "";
}

.footer-inner {
  position: relative;
  padding-top: 64px;
  padding-bottom: 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr 1.35fr 1fr;
  gap: clamp(30px, 5vw, 68px);
}

.footer-brand {
  max-width: 330px;
}

.footer-brand .brand {
  margin-bottom: 18px;
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 14px;
  line-height: 1.8;
}

.footer-heading {
  margin-bottom: 16px;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-links {
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
  list-style: none;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 14px;
}

.footer-links a:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-bottom {
  margin-top: 48px;
  padding-top: 20px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  border-top: var(--line-thin) solid var(--color-border-soft);
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

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

.prose h2 {
  margin-top: 3.5rem;
  padding-top: 1rem;
  border-top: var(--line-thin) solid var(--color-border-soft);
}

.prose h3 {
  margin-top: 2.2rem;
}

.prose a {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 4px;
}

.prose li + li {
  margin-top: 0.45rem;
}

.prose img {
  margin-block: 1.5rem;
}

@media (max-width: 1120px) {
  .desktop-nav {
    display: none;
  }

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

  .menu-toggle {
    display: grid;
  }

  .language-control {
    display: none;
  }

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

@media (max-width: 760px) {
  :root {
    --header-height: 64px;
  }

  h1 {
    font-size: clamp(38px, 12vw, 54px);
  }

  h2 {
    font-size: clamp(29px, 9vw, 40px);
  }

  .brand-subtitle {
    display: none;
  }

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

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

  .footer-bottom {
    display: grid;
  }
}

@media (max-width: 640px) {
  .wrap,
  .page-shell,
  .header-inner,
  .footer-inner,
  .content-wrap,
  .reading-wrap {
    padding-inline: max(16px, var(--gutter));
  }

  .header-inner {
    gap: 10px;
  }

  .brand-mark,
  .brand-mark img {
    width: 36px;
    height: 36px;
  }

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

  .button-row,
  .hero-actions {
    align-items: stretch;
  }

  .button-row .button,
  .hero-actions .hero-button {
    flex: 1 1 150px;
  }

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

  .panel,
  .paper-card {
    padding: 20px;
  }

  .section,
  .sec {
    padding-top: 60px;
    padding-bottom: 60px;
  }

  .data-table th,
  .data-table td {
    padding: 12px;
  }
}

@media (max-width: 390px) {
  .brand-copy {
    max-width: 145px;
  }

  .brand-name {
    overflow: hidden;
    text-overflow: ellipsis;
  }
}

@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 {
    opacity: 1;
    transform: none;
  }
}