:root {
  --color-bg: #FBF8EF;
  --color-panel: #F1F3E8;
  --color-water: #DDF1EB;
  --color-border: #B8C8BD;
  --color-accent: #174C3B;
  --color-accent-dark: #0B3328;
  --color-text: #17332A;
  --color-muted: #63756D;
  --color-success: #2F7D63;
  --color-warn: #B36A2E;
  --color-error: #C7372F;
  --color-white: #FFFFFF;
  --color-paper-soft: rgba(251, 248, 239, 0.88);
  --color-paper-faint: rgba(251, 248, 239, 0.56);
  --color-water-soft: rgba(221, 241, 235, 0.62);
  --color-water-strong: rgba(170, 224, 211, 0.76);
  --color-accent-soft: rgba(23, 76, 59, 0.09);
  --color-accent-line: rgba(23, 76, 59, 0.28);
  --color-accent-shadow: rgba(11, 51, 40, 0.16);
  --color-red-soft: rgba(199, 55, 47, 0.09);
  --color-white-soft: rgba(255, 255, 255, 0.72);
  --color-white-line: rgba(255, 255, 255, 0.8);
  --font-display: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  --font-body: Inter, "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --radius-none: 0;
  --radius-small: 3px;
  --radius-medium: 8px;
  --radius-pill: 999px;
  --shadow-panel: 0 14px 34px var(--color-accent-shadow);
  --shadow-button: 0 9px 20px var(--color-accent-shadow);
  --shadow-float: 0 12px 28px var(--color-accent-shadow);
  --content-max: 1180px;
  --reading-max: 48rem;
  --gutter: clamp(16px, 4vw, 32px);
  --header-height: 82px;
  --toc-offset: 96px;
  --section-space: clamp(64px, 9vw, 112px);
  --transition-fast: 180ms ease;
  --transition-reveal: 620ms cubic-bezier(0.2, 0.7, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  color: var(--color-text);
  background: var(--color-bg);
  font-family: var(--font-body);
  text-size-adjust: 100%;
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 0;
  min-height: 100%;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  background:
    linear-gradient(180deg, var(--color-bg), var(--color-bg) 72%, var(--color-panel));
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
}

main,
header,
footer,
section,
article,
aside,
nav,
div {
  min-width: 0;
}

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

img {
  height: auto;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  cursor: pointer;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

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

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

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

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

h1 {
  max-width: 14em;
  margin-bottom: 0.32em;
  font-family: var(--font-display);
  font-size: clamp(52px, 6vw, 72px);
  font-weight: 650;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h2 {
  margin-bottom: 0.55em;
  font-family: var(--font-display);
  font-size: clamp(32px, 4.2vw, 48px);
  font-weight: 650;
  line-height: 1.18;
  letter-spacing: -0.015em;
}

h3 {
  margin-bottom: 0.55em;
  font-size: clamp(20px, 2.4vw, 27px);
  line-height: 1.3;
}

h4 {
  margin-bottom: 0.5em;
  font-size: 17px;
  line-height: 1.4;
}

small {
  font-size: 0.82em;
}

strong {
  color: var(--color-accent-dark);
  font-weight: 760;
}

hr {
  margin: 2.5rem 0;
  border: 0;
  border-top: 1px solid var(--color-border);
}

code,
kbd,
samp {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

code {
  overflow-wrap: anywhere;
  padding: 0.12em 0.35em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-panel);
}

pre {
  max-width: 100%;
  padding: 18px;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-small);
  background: var(--color-accent-dark);
  color: var(--color-white);
  line-height: 1.6;
  -webkit-overflow-scrolling: touch;
}

pre code {
  padding: 0;
  border: 0;
  color: inherit;
  background: transparent;
  overflow-wrap: normal;
  white-space: pre;
}

::selection {
  color: var(--color-white);
  background: var(--color-accent);
}

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

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

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

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

.section-compact {
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(40px, 6vw, 72px);
}

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

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

.eyebrow {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  margin-bottom: 16px;
  color: var(--color-success);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 760;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 7px;
  height: 7px;
  margin-right: 9px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  content: "";
  background: var(--color-success);
  box-shadow: 0 0 0 4px var(--color-accent-soft);
}

.lead {
  max-width: 46rem;
  color: var(--color-muted);
  font-size: clamp(18px, 2.1vw, 22px);
  line-height: 1.65;
}

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

.mono {
  font-family: var(--font-mono);
}

.text-gradient {
  background: linear-gradient(90deg, var(--color-accent-dark), var(--color-success));
  background-clip: text;
  color: transparent;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 126px;
  min-height: 46px;
  padding: 10px 22px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-small);
  color: var(--color-accent);
  background: var(--color-bg);
  font-size: 14px;
  font-weight: 750;
  line-height: 1.2;
  letter-spacing: 0.02em;
  text-align: center;
  text-decoration: none;
  transition:
    color var(--transition-fast),
    background var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

.button:hover {
  transform: translateY(-2px);
  color: var(--color-accent-dark);
  box-shadow: var(--shadow-button);
}

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

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

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

.button-secondary {
  color: var(--color-accent-dark);
  background: var(--color-paper-soft);
}

.button-danger {
  border-color: var(--color-error);
  color: var(--color-error);
  background: var(--color-red-soft);
}

.button[disabled],
.button.is-disabled {
  cursor: not-allowed;
  opacity: 0.55;
  box-shadow: none;
  transform: none;
}

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

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

.card {
  padding: 24px;
}

.paper-panel {
  background:
    linear-gradient(90deg, transparent 31px, var(--color-accent-line) 32px, transparent 33px),
    var(--color-paper-soft);
}

.badge,
.tag,
.fact-pill {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  min-height: 30px;
  padding: 5px 12px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-accent);
  background: var(--color-paper-soft);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.25;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.badge::before,
.fact-pill::before {
  width: 7px;
  height: 7px;
  margin-right: 8px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  content: "";
  background: var(--color-success);
}

.badge-error::before {
  background: var(--color-error);
}

.badge-warn::before {
  background: var(--color-warn);
}

.fact-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  color: var(--color-accent-dark);
  background: var(--color-panel);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
}

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

.prose {
  min-width: 0;
}

.prose > * {
  max-width: 100%;
}

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

.prose h2 {
  margin-top: 2.2em;
}

.prose h3 {
  margin-top: 1.65em;
}

.prose blockquote {
  margin-inline: 0;
  padding: 18px 22px;
  border-left: 4px solid var(--color-success);
  background: var(--color-water);
  color: var(--color-accent-dark);
}

.prose > .data-table {
  display: block;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

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

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

.site-header {
  position: relative;
  z-index: 60;
  height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-paper-soft);
}

.header-inner {
  display: grid;
  grid-template-columns: 216px minmax(0, 1fr) auto;
  align-items: center;
  width: min(1340px, calc(100% - 64px));
  height: 100%;
  margin-inline: auto;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  width: max-content;
  color: var(--color-accent-dark);
  text-decoration: none;
  gap: 10px;
}

.brand-logo {
  width: 29px;
  height: 34px;
  flex: 0 0 auto;
  object-fit: contain;
}

.brand-word {
  color: var(--color-accent-dark);
  font-size: 19px;
  font-weight: 750;
  letter-spacing: -0.025em;
}

.brand-local {
  padding-left: 9px;
  border-left: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.primary-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  gap: 19px;
  white-space: nowrap;
}

.primary-nav a {
  position: relative;
  padding: 30px 0 27px;
  color: var(--color-muted);
  font-size: 13px;
  font-weight: 560;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.primary-nav a:hover,
.primary-nav a[aria-current="page"] {
  color: var(--color-accent-dark);
}

.primary-nav a[aria-current="page"]::after {
  position: absolute;
  right: 0;
  bottom: 20px;
  left: 0;
  height: 2px;
  content: "";
  background: var(--color-error);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
}

.login-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 18px;
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-small);
  color: var(--color-accent);
  background: var(--color-bg);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.language-menu {
  position: relative;
}

.language-toggle {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0 8px;
  border: 0;
  color: var(--color-muted);
  background: transparent;
  font-size: 12px;
}

.language-toggle::after {
  margin-left: 7px;
  content: "⌄";
}

.language-list {
  position: absolute;
  z-index: 70;
  top: calc(100% + 9px);
  right: 0;
  width: 152px;
  padding: 7px;
  visibility: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  opacity: 0;
  background: var(--color-bg);
  box-shadow: var(--shadow-panel);
  transform: translateY(-6px);
  transition:
    opacity var(--transition-fast),
    transform var(--transition-fast),
    visibility var(--transition-fast);
}

.language-menu.is-open .language-list {
  visibility: visible;
  opacity: 1;
  transform: none;
}

.language-list a {
  display: block;
  min-height: 38px;
  padding: 8px 10px;
  color: var(--color-muted);
  font-size: 12px;
  text-decoration: none;
}

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

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  padding: 9px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-bg);
}

.menu-toggle span {
  display: block;
  width: 21px;
  height: 2px;
  margin: 4px auto;
  background: var(--color-accent);
}

.mobile-nav {
  display: none;
}

.nav-veil {
  position: fixed;
  z-index: 45;
  inset: var(--header-height) 0 0;
  display: none;
  border: 0;
  background: var(--color-accent-shadow);
}

.site-footer {
  position: relative;
  overflow-x: clip;
  border-top: 1px solid var(--color-border);
  background: var(--color-accent-dark);
  color: var(--color-water);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.35fr 1fr;
  padding-top: 62px;
  padding-bottom: 50px;
  gap: 42px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  margin-bottom: 18px;
  color: var(--white);
  gap: 10px;
}

.footer-brand img {
  width: 32px;
  height: 38px;
  flex: 0 0 auto;
}

.footer-brand strong {
  color: var(--color-white);
  font-size: 20px;
}

.footer-intro {
  max-width: 26rem;
  color: var(--color-border);
  font-size: 13px;
}

.footer-title {
  margin-bottom: 14px;
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.footer-links {
  display: grid;
  gap: 8px;
}

.footer-links a {
  width: fit-content;
  color: var(--color-border);
  font-size: 13px;
  text-decoration: none;
}

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

.footer-hot {
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 7px;
}

.footer-hot a {
  max-width: 100%;
  padding: 5px 9px;
  overflow: hidden;
  border: 1px solid var(--color-accent-line);
  border-radius: var(--radius-small);
  color: var(--color-water);
  font-size: 11px;
  line-height: 1.3;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-decoration: none;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  padding-bottom: 24px;
  border-top: 1px solid var(--color-accent-line);
  color: var(--color-border);
  font-size: 12px;
  gap: 20px;
}

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

.footer-legal a {
  color: var(--color-border);
  text-decoration: none;
}

body:has(.toc-tabs) section[id] {
  scroll-margin-top: var(--toc-offset);
}

@media (max-width: 1240px) {
  .header-inner {
    width: calc(100% - 36px);
    grid-template-columns: 180px minmax(0, 1fr) auto;
    gap: 14px;
  }

  .primary-nav {
    gap: 12px;
  }

  .primary-nav a {
    font-size: 12px;
  }

  .brand-local {
    display: none;
  }
}

@media (max-width: 1040px) {
  :root {
    --header-height: 70px;
    --toc-offset: 84px;
  }

  .site-header {
    height: var(--header-height);
  }

  .header-inner {
    display: flex;
    width: calc(100% - 28px);
  }

  .primary-nav {
    display: none;
  }

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

  .desktop-language {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .mobile-nav {
    position: absolute;
    z-index: 70;
    top: 100%;
    right: 0;
    left: 0;
    max-height: calc(100dvh - var(--header-height));
    padding: 8px var(--gutter) 18px;
    overflow-y: auto;
    overscroll-behavior: contain;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    box-shadow: var(--shadow-panel);
  }

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

  .mobile-nav a {
    display: flex;
    align-items: center;
    width: 100%;
    min-height: 46px;
    padding: 11px 8px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-muted);
    text-decoration: none;
  }

  .mobile-nav a[aria-current="page"] {
    color: var(--color-accent-dark);
    font-weight: 750;
  }

  .mobile-language {
    margin-top: 8px;
  }

  .mobile-language strong {
    display: block;
    padding: 10px 8px 4px;
    color: var(--color-muted);
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.08em;
  }

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

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

@media (max-width: 768px) {
  h1 {
    font-size: clamp(28px, 10vw, 40px);
    line-height: 1.12;
  }

  h2 {
    font-size: clamp(28px, 8vw, 38px);
  }

  .section {
    padding-top: 64px;
    padding-bottom: 64px;
  }

  .section-compact {
    padding-top: 42px;
    padding-bottom: 42px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    padding-top: 48px;
    gap: 30px;
  }

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

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

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

  body {
    font-size: 15px;
  }

  .brand-word {
    font-size: 18px;
  }

  .brand-logo {
    width: 27px;
    height: 32px;
  }

  .login-link {
    min-height: 40px;
    padding-inline: 13px;
  }

  .actions {
    width: 100%;
  }

  .actions .button {
    flex: 1 1 130px;
  }

  .data-table th,
  .data-table td {
    padding: 11px 12px;
  }

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

@media (max-width: 360px) {
  .header-inner {
    width: calc(100% - 20px);
    gap: 6px;
  }

  .login-link {
    padding-inline: 10px;
    font-size: 12px;
  }

  .brand {
    gap: 7px;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0s;
    animation-iteration-count: 1;
    scroll-behavior: auto;
    transition-duration: 0s;
  }

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