:root {
  --color-bg: #F2F3EF;
  --color-panel: #F9F8F2;
  --color-panel-cool: #E5EAEB;
  --color-border: #AEBCC0;
  --color-border-soft: #CCD5D7;
  --color-accent: #D56F3E;
  --color-accent-dark: #A84A27;
  --color-accent-pale: #E8B394;
  --color-accent-wash: #EED4C4;
  --color-text: #243238;
  --color-text-muted: #697A80;
  --color-success: #467B68;
  --color-warn: #B77A2D;
  --color-error: #A7463B;
  --color-web: #71878D;
  --color-web-light: #B5C2C5;
  --color-cat: #2F3E43;
  --color-cat-detail: #5F7075;
  --color-paper: #FFFFFF;
  --color-transparent: transparent;
  --color-header: rgba(249, 248, 242, 0.82);
  --color-panel-alpha: rgba(249, 248, 242, 0.76);
  --color-panel-soft-alpha: rgba(229, 234, 235, 0.62);
  --color-border-alpha: rgba(174, 188, 192, 0.56);
  --color-texture: rgba(36, 50, 56, 0.045);
  --color-accent-alpha: rgba(213, 111, 62, 0.13);
  --color-accent-route: rgba(213, 111, 62, 0.72);
  --color-white-alpha: rgba(255, 255, 255, 0.88);
  --color-shadow: rgba(36, 50, 56, 0.09);
  --color-shadow-strong: rgba(36, 50, 56, 0.16);
  --color-selection: #EFD7C9;
  --font-display: "Iowan Old Style", Baskerville, "Times New Roman", "Songti SC", SimSun, serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --radius-circle: 999px;
  --radius-pill: 999px;
  --radius-small: 5px;
  --radius-medium: 12px;
  --radius-large: 24px;
  --line-thin: 1px;
  --line-medium: 2px;
  --header-height: 78px;
  --page-max: 1480px;
  --content-max: 1180px;
  --reading-max: 820px;
  --gutter: clamp(16px, 4vw, 62px);
  --space-section: clamp(72px, 9vw, 136px);
  --ease-fast: 180ms ease;
  --ease-reveal: 680ms cubic-bezier(0.2, 0.72, 0.24, 1);
  --ease-calm: 4.8s ease-in-out;
  --shadow-button: 0 8px 24px var(--color-shadow);
  --shadow-panel: 0 18px 50px var(--color-shadow);
}

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

html {
  min-width: 0;
  scroll-behavior: smooth;
  background: var(--color-bg);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 0;
  min-height: 100%;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  background:
    radial-gradient(circle at 18% 20%, var(--color-texture) 0 1px, var(--color-transparent) 1.4px),
    linear-gradient(153deg, var(--color-panel-cool) 0%, var(--color-bg) 48%, var(--color-bg) 77%, var(--color-accent-wash) 132%);
  background-size: 18px 18px, 100% 100%;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

img,
svg,
video {
  max-width: 100%;
  height: auto;
}

img {
  display: block;
}

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

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

button {
  cursor: pointer;
}

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

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

p {
  margin-bottom: 1.2em;
}

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

li + li {
  margin-top: 0.4em;
}

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

h1,
.display-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(52px, 6.2vw, 82px);
  font-weight: 700;
  line-height: 0.99;
  letter-spacing: -0.035em;
}

h2 {
  margin: 0 0 24px;
  font-family: var(--font-display);
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.025em;
}

h3 {
  margin: 0 0 14px;
  font-size: clamp(20px, 2.2vw, 27px);
  line-height: 1.3;
}

h4 {
  margin: 0 0 10px;
  font-size: 17px;
}

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

strong {
  font-weight: 680;
}

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

:not(pre) > code {
  padding: 0.12em 0.35em;
  overflow-wrap: anywhere;
  color: var(--color-accent-dark);
  background: var(--color-accent-alpha);
  border-radius: var(--radius-small);
  font-size: 0.9em;
}

pre {
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  color: var(--color-panel);
  background: var(--color-text);
  border: var(--line-thin) solid var(--color-cat-detail);
  border-radius: var(--radius-small);
  font: 13px/1.75 var(--font-mono);
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

pre code {
  color: inherit;
  overflow-wrap: normal;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 13px 15px;
  border-bottom: var(--line-thin) solid var(--color-border-soft);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--color-text);
  background: var(--color-panel-cool);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

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

[hidden] {
  display: none !important;
}

.wrap,
.page-shell,
.reading-shell {
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-width: 0;
}

.wrap,
.page-shell {
  max-width: var(--page-max);
}

.reading-shell {
  max-width: calc(var(--reading-max) + var(--gutter) + var(--gutter));
}

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

.section-compact {
  padding-top: clamp(44px, 6vw, 76px);
  padding-bottom: clamp(44px, 6vw, 76px);
  overflow-x: clip;
}

.section-heading {
  max-width: 760px;
  margin-bottom: clamp(32px, 5vw, 58px);
}

.kicker,
.eyebrow,
.plate-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 18px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 650;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

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

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

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

.lead {
  max-width: 720px;
  color: var(--color-text-muted);
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.85;
}

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

.panel {
  padding: clamp(24px, 4vw, 48px);
  border-radius: var(--radius-medium);
}

.card {
  padding: 24px;
  border-radius: var(--radius-small);
}

.card:hover {
  border-color: var(--color-web);
}

.paper-panel {
  position: relative;
  background:
    radial-gradient(circle at 18% 24%, var(--color-texture) 0 1px, var(--color-transparent) 1.2px),
    var(--color-panel);
  background-size: 16px 16px;
}

.paper-panel::before {
  position: absolute;
  top: 14px;
  left: -5px;
  width: 10px;
  height: 38px;
  content: "";
  background: var(--color-accent);
}

.tilt,
.tilt-card {
  transform: rotate(-0.35deg);
}

.button,
.btn {
  min-height: 48px;
  padding: 0 20px;
  display: inline-flex;
  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: 680;
  line-height: 1.2;
  text-align: center;
  transition:
    color var(--ease-fast),
    background-color var(--ease-fast),
    border-color var(--ease-fast),
    transform var(--ease-fast);
}

.button svg,
.btn svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.button:hover,
.btn:hover {
  transform: translateY(-2px);
}

.button-primary,
.btn-primary {
  color: var(--color-paper);
  background: var(--color-accent);
  border-color: var(--color-accent-dark);
  box-shadow: var(--shadow-button);
}

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

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

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

.button-quiet,
.btn-quiet {
  color: var(--color-accent-dark);
  background: var(--color-transparent);
  border-color: var(--color-accent-pale);
}

.button[disabled],
.btn[disabled],
.button.is-disabled,
.btn.is-disabled {
  cursor: not-allowed;
  color: var(--color-text-muted);
  background: var(--color-panel-cool);
  border-color: var(--color-border-soft);
  box-shadow: none;
  transform: none;
  opacity: 0.68;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  border-bottom: var(--line-thin) solid var(--color-border-alpha);
  background: var(--color-header);
  backdrop-filter: blur(14px);
}

.header-inner {
  width: 100%;
  max-width: var(--page-max);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  min-width: 0;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-logo {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
}

.brand-copy {
  min-width: 0;
  display: grid;
  gap: 1px;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.15;
}

.brand-note {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 8px;
  letter-spacing: 0.15em;
  line-height: 1.3;
  text-transform: uppercase;
}

.desktop-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  position: relative;
  min-height: 40px;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--color-text-muted);
  border-radius: var(--radius-small);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  transition: color var(--ease-fast), background-color var(--ease-fast);
}

.nav-link svg,
.language-button svg,
.menu-button svg,
.mobile-nav-link svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

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

.nav-link[aria-current="page"]::after {
  position: absolute;
  right: 10px;
  bottom: 3px;
  left: 10px;
  height: var(--line-medium);
  content: "";
  background: var(--color-accent);
}

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

.language-button {
  min-height: 38px;
  padding: 0 13px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-panel);
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: 12px;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 4;
  width: 170px;
  padding: 7px;
  background: var(--color-panel);
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-small);
  box-shadow: var(--shadow-panel);
}

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

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

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

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

.mobile-drawer {
  position: fixed;
  top: var(--header-height);
  right: 0;
  left: 0;
  z-index: 52;
  max-height: calc(100dvh - var(--header-height));
  padding: 12px var(--gutter) 20px;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--color-panel);
  border-bottom: var(--line-thin) solid var(--color-border);
}

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

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

.mobile-nav-list {
  display: grid;
  gap: 4px;
}

.mobile-nav-list li,
.mobile-language-list li {
  margin: 0;
}

.mobile-nav-link,
.mobile-language-link {
  width: 100%;
  min-height: 48px;
  padding: 10px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-radius: var(--radius-small);
}

.mobile-nav-link:hover,
.mobile-nav-link[aria-current="page"],
.mobile-language-link:hover,
.mobile-language-link[aria-current="true"] {
  background: var(--color-accent-alpha);
}

.mobile-language-group {
  margin-top: 12px;
  padding-top: 12px;
  border-top: var(--line-thin) solid var(--color-border-soft);
}

.mobile-language-title {
  margin: 0 12px 6px;
  color: var(--color-text-muted);
  font: 9px/1.5 var(--font-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.mobile-language-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.nav-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 49;
  background: var(--color-shadow-strong);
}

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

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

.footer-main {
  padding-top: 68px;
  padding-bottom: 52px;
  display: grid;
  grid-template-columns: minmax(260px, 1.3fr) repeat(3, minmax(150px, 0.8fr));
  gap: clamp(30px, 5vw, 70px);
}

.footer-brand p {
  max-width: 390px;
  margin: 18px 0 0;
}

.footer-title {
  margin: 0 0 16px;
  color: var(--color-text);
  font: 650 11px/1.4 var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

.footer-links li {
  margin: 0;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  font-size: 14px;
}

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

.footer-bottom {
  padding-top: 20px;
  padding-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  border-top: var(--line-thin) solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.04em;
}

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

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

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

.icon-dot,
.status-dot,
.chip-dot {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: var(--radius-circle);
  background: var(--color-success);
}

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

.table-wrap table {
  min-width: 660px;
  margin: 0;
}

.prose {
  min-width: 0;
}

.prose h2 {
  margin-top: 2em;
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.prose h3 {
  margin-top: 1.7em;
  scroll-margin-top: calc(var(--header-height) + 24px);
}

.prose a:not(.button):not(.btn) {
  color: var(--color-accent-dark);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-pale);
  text-underline-offset: 0.18em;
}

.prose img,
.prose iframe {
  max-width: 100%;
}

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

  .desktop-nav .nav-link {
    padding-inline: 8px;
  }

  .desktop-nav .nav-link svg {
    display: none;
  }

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

@media (max-width: 860px) {
  .site-header {
    height: 68px;
  }

  :root {
    --header-height: 68px;
  }

  .desktop-nav,
  .header-tools > .language-button,
  .header-tools > .language-menu {
    display: none;
  }

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

  .menu-button {
    display: grid;
  }

  .brand-logo {
    width: 38px;
    height: 38px;
  }

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

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

@media (max-width: 640px) {
  :root {
    --gutter: clamp(16px, 5vw, 24px);
  }

  body {
    font-size: 15px;
  }

  h1,
  .display-title {
    font-size: clamp(46px, 14vw, 62px);
  }

  h2 {
    font-size: clamp(31px, 10vw, 42px);
  }

  .wrap,
  .page-shell,
  .reading-shell {
    width: 100%;
    padding-inline: var(--gutter);
  }

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

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

  .button,
  .btn {
    min-height: 50px;
  }

  .mobile-language-list {
    grid-template-columns: 1fr;
  }

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

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

  .card {
    padding: 20px;
  }

  th,
  td {
    padding: 11px 12px;
  }
}

@media (max-width: 380px) {
  .brand-copy {
    max-width: 160px;
  }

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

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

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

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