:root {
  --color-bg: #EAF8F7;
  --color-panel: #F9FEFD;
  --color-panel-alt: #C9F0F2;
  --color-border: #79BFC7;
  --color-accent: #007C91;
  --color-accent-dark: #005A6B;
  --color-text: #0A2C33;
  --color-text-muted: #4A6970;
  --color-success: #278A68;
  --color-warn: #F15A36;
  --color-error: #C9342C;
  --color-white: #FFFFFF;
  --color-transparent: transparent;
  --color-tile-line: rgba(255, 255, 255, 0.7);
  --color-grid-line: rgba(121, 191, 199, 0.24);
  --color-water-wash: rgba(0, 124, 145, 0.13);
  --color-water-soft: rgba(201, 240, 242, 0.78);
  --color-water-wave: rgba(255, 255, 255, 0.32);
  --color-ink-soft: rgba(10, 44, 51, 0.66);
  --color-veil: rgba(10, 44, 51, 0.48);
  --font-display: "Noto Sans SC", "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --radius-none: 0;
  --radius-small: 4px;
  --radius-pill: 999px;
  --line-thin: 1px;
  --line-medium: 2px;
  --line-heavy: 4px;
  --header-height: 72px;
  --gutter: clamp(16px, 3vw, 42px);
  --content-width: 1356px;
  --reading-width: 820px;
  --section-space: clamp(72px, 9vw, 128px);
  --transition-fast: 180ms ease;
  --transition-reveal: 640ms ease;
  --transition-slow: 5.5s ease-in-out;
}

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

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

html.nav-open {
  overflow: hidden;
}

body {
  width: 100%;
  min-width: 0;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  background-color: var(--color-bg);
  font-family: var(--font-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

img {
  display: block;
}

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

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

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

button {
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
}

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

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

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

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

h1 {
  font-size: clamp(44px, 6vw, 84px);
  font-weight: 950;
  letter-spacing: -0.055em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 900;
  letter-spacing: -0.035em;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 850;
  letter-spacing: -0.02em;
}

p {
  margin-bottom: 1em;
}

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

:not(pre) > code {
  padding: 0.1em 0.35em;
  overflow-wrap: anywhere;
  color: var(--color-accent-dark);
  border: var(--line-thin) solid var(--color-border);
  background-color: var(--color-panel-alt);
}

pre {
  max-width: 100%;
  margin: 20px 0;
  padding: 18px;
  overflow-x: auto;
  color: var(--color-panel);
  border-left: var(--line-heavy) solid var(--color-warn);
  background-color: var(--color-accent-dark);
  line-height: 1.65;
  -webkit-overflow-scrolling: touch;
}

pre code {
  overflow-wrap: normal;
  word-break: normal;
}

.wrap {
  width: 100%;
  max-width: calc(var(--content-width) + (var(--gutter) * 2));
  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 {
  position: relative;
  padding-top: var(--section-space);
  padding-bottom: var(--section-space);
  overflow-x: clip;
}

.section-alt {
  border-top: var(--line-thin) solid var(--color-border);
  border-bottom: var(--line-thin) solid var(--color-border);
  background-color: var(--color-panel);
  background-image:
    linear-gradient(var(--color-grid-line) var(--line-thin), var(--color-transparent) var(--line-thin)),
    linear-gradient(90deg, var(--color-grid-line) var(--line-thin), var(--color-transparent) var(--line-thin));
  background-size: 32px 32px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: clamp(32px, 5vw, 64px);
}

.section-kicker,
.eyebrow {
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.section-kicker::before,
.eyebrow::before {
  width: 30px;
  height: var(--line-heavy);
  flex-shrink: 0;
  background-color: var(--color-warn);
  content: "";
}

.lead {
  color: var(--color-text-muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.75;
}

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

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

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

.button {
  min-height: 44px;
  padding: 0 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border: var(--line-medium) solid var(--color-accent-dark);
  border-radius: var(--radius-small);
  background-color: var(--color-panel);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

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

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

.button-primary:hover {
  border-color: var(--color-warn);
  background-color: var(--color-warn);
}

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

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

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

.button:disabled {
  color: var(--color-text-muted);
  border-color: var(--color-border);
  background-color: var(--color-panel-alt);
  transform: none;
}

.button-arrow {
  flex-shrink: 0;
  color: var(--color-warn);
  font-family: var(--font-mono);
  font-size: 16px;
}

.panel,
.card {
  position: relative;
  min-width: 0;
  padding: clamp(20px, 3vw, 32px);
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-none);
  background-color: var(--color-panel);
}

.panel {
  border-width: var(--line-medium);
}

.rule-top::before {
  position: absolute;
  top: calc(var(--line-medium) * -1);
  left: 0;
  width: 92px;
  height: var(--line-heavy);
  background-color: var(--color-warn);
  content: "";
}

.card {
  transition:
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.card:hover {
  border-color: var(--color-accent-dark);
  transform: translateY(-3px);
}

.badge,
.tag,
.chip {
  max-width: 100%;
  min-height: 26px;
  padding: 3px 10px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  overflow: hidden;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-pill);
  background-color: var(--color-panel);
  color: var(--color-accent-dark);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  line-height: 1.4;
  white-space: nowrap;
}

.badge-dot {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background-color: var(--color-warn);
}

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

.badge-warning {
  color: var(--color-error);
  border-color: var(--color-warn);
}

.data-table,
table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-panel);
}

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

th {
  color: var(--color-white);
  background-color: var(--color-accent-dark);
  font-size: 13px;
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.prose {
  color: var(--color-text-muted);
  font-size: 17px;
}

.prose h2,
.prose h3,
.prose strong {
  color: var(--color-text);
}

.prose h2 {
  margin-top: 2.2em;
  padding-top: 0.35em;
  border-top: var(--line-medium) solid var(--color-border);
}

.prose h3 {
  margin-top: 1.8em;
}

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

.prose li {
  margin-bottom: 0.55em;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--transition-reveal),
    transform var(--transition-reveal);
}

.reveal.shown {
  opacity: 1;
  transform: translateY(0);
}

.site-header {
  position: relative;
  z-index: 50;
  height: var(--header-height);
  border-bottom: var(--line-thin) solid var(--color-border);
  background-color: var(--color-panel);
}

.header-inner {
  width: 100%;
  max-width: calc(var(--content-width) + (var(--gutter) * 2));
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: 32px;
}

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

.brand-mark {
  width: 39px;
  height: 39px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  overflow: hidden;
  border: var(--line-medium) solid var(--color-accent-dark);
  border-radius: var(--radius-pill);
  background: linear-gradient(145deg, var(--color-accent), var(--color-accent-dark));
}

.brand-mark img {
  width: 100%;
  height: 100%;
}

.brand-copy {
  display: grid;
  gap: 1px;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.brand-domain {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.desktop-nav {
  height: 100%;
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 28px;
}

.desktop-nav a {
  position: relative;
  height: 100%;
  display: inline-flex;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 650;
  white-space: nowrap;
}

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

.desktop-nav a[aria-current="page"]::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: var(--line-heavy);
  background-color: var(--color-warn);
  content: "";
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.language-picker {
  position: relative;
}

.language-button {
  min-height: 34px;
  padding: 0 13px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-accent-dark);
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-pill);
  background-color: var(--color-bg);
  font-size: 13px;
  font-weight: 800;
}

.language-caret {
  flex-shrink: 0;
  color: var(--color-warn);
  font-size: 11px;
}

.language-menu {
  position: absolute;
  top: calc(100% + 9px);
  right: 0;
  z-index: 70;
  width: 170px;
  padding: 6px;
  display: none;
  border: var(--line-medium) solid var(--color-accent-dark);
  background-color: var(--color-panel);
}

.language-picker.open .language-menu {
  display: grid;
}

.language-menu a {
  min-height: 40px;
  padding: 8px 10px;
  display: flex;
  align-items: center;
  font-size: 13px;
  font-weight: 700;
}

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

.menu-toggle {
  width: 44px;
  min-width: 44px;
  height: 44px;
  min-height: 44px;
  padding: 10px;
  display: none;
  border: var(--line-thin) solid var(--color-border);
  border-radius: var(--radius-small);
  background-color: var(--color-panel);
}

.menu-toggle span {
  width: 100%;
  height: var(--line-medium);
  margin-block: 4px;
  display: block;
  background-color: var(--color-accent-dark);
}

.mobile-nav {
  position: fixed;
  top: var(--header-height);
  right: 0;
  left: 0;
  z-index: 65;
  max-height: calc(100dvh - var(--header-height));
  padding: 10px var(--gutter) 20px;
  display: none;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-bottom: var(--line-heavy) solid var(--color-accent-dark);
  background-color: var(--color-panel);
}

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

.mobile-nav a {
  width: 100%;
  min-height: 48px;
  padding: 12px 4px;
  display: flex;
  align-items: center;
  border-bottom: var(--line-thin) solid var(--color-border);
  font-weight: 800;
}

.mobile-nav a[aria-current="page"] {
  color: var(--color-accent-dark);
  border-left: var(--line-heavy) solid var(--color-warn);
  padding-left: 12px;
}

.mobile-language-label {
  margin: 18px 0 4px;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

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

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

.site-footer {
  position: relative;
  overflow-x: clip;
  color: var(--color-panel);
  border-top: var(--line-heavy) solid var(--color-warn);
  background-color: var(--color-accent-dark);
}

.footer-grid {
  padding-top: 64px;
  padding-bottom: 50px;
  display: grid;
  grid-template-columns: minmax(240px, 1.3fr) repeat(3, minmax(150px, 1fr));
  gap: clamp(28px, 5vw, 72px);
}

.footer-brand .brand-name {
  color: var(--color-white);
}

.footer-brand .brand-domain,
.footer-description {
  color: var(--color-panel-alt);
}

.footer-description {
  max-width: 380px;
  margin-top: 18px;
  font-size: 14px;
}

.footer-title {
  margin-bottom: 16px;
  color: var(--color-white);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

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

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

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

.footer-bottom {
  padding-top: 20px;
  padding-bottom: 24px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  border-top: var(--line-thin) solid var(--color-border);
  color: var(--color-panel-alt);
  font-size: 12px;
}

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

@media (max-width: 1120px) {
  .desktop-nav {
    gap: 17px;
  }

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

  .brand-domain {
    display: none;
  }
}

@media (max-width: 900px) {
  .desktop-nav,
  .header-tools > .language-picker {
    display: none;
  }

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

  .menu-toggle {
    display: block;
  }

  .footer-grid {
    grid-template-columns: 1.2fr 1fr;
  }
}

@media (max-width: 640px) {
  :root {
    --header-height: 64px;
    --gutter: 16px;
  }

  h1 {
    font-size: clamp(42px, 14vw, 62px);
  }

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

  .brand {
    gap: 9px;
  }

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

  .brand-name {
    font-size: 15px;
  }

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

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

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

  .footer-bottom {
    flex-direction: column;
  }

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

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

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

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

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