:root {
  --color-page: #ffffff;
  --color-panel: #f6f5f2;
  --color-panel-strong: #edeae4;
  --color-border: #e4e1db;
  --color-accent: #f0862a;
  --color-accent-deep: #cf6a15;
  --color-text: #1d1d22;
  --color-muted: #6b6a70;
  --color-success: #4caf6a;
  --color-warning: #d9a02b;
  --color-error: #e35d5d;
  --color-on-accent: #1d1d22;
  --color-on-dark: #ffffff;
  --color-accent-soft: rgba(240, 134, 42, 0.12);
  --color-accent-line: rgba(240, 134, 42, 0.32);
  --color-accent-glow: rgba(240, 134, 42, 0.3);
  --color-accent-glow-soft: rgba(240, 134, 42, 0.12);
  --color-success-soft: rgba(76, 175, 106, 0.14);
  --color-error-soft: rgba(227, 93, 93, 0.13);
  --color-warning-soft: rgba(217, 160, 43, 0.15);
  --color-ink-04: rgba(29, 29, 34, 0.04);
  --color-ink-08: rgba(29, 29, 34, 0.08);
  --color-ink-12: rgba(29, 29, 34, 0.12);
  --color-ink-22: rgba(29, 29, 34, 0.22);
  --color-header-glass: rgba(255, 255, 255, 0.84);
  --font-display: "Inter", "Noto Sans SC", -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
  --radius-xl: 32px;
  --radius-lg: 26px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --radius-pill: 999px;
  --shadow-soft: 0 1px 2px var(--color-ink-04), 0 10px 28px var(--color-ink-08);
  --shadow-lift: 0 2px 4px var(--color-ink-04), 0 18px 44px var(--color-ink-12);
  --shadow-hero: 0 1px 2px var(--color-ink-04), 0 14px 34px var(--color-ink-08), 0 48px 96px -24px var(--color-accent-line);
  --container: 1240px;
  --reading: 820px;
  --header-wide: 1280px;
  --header-height: 72px;
  --gutter: clamp(16px, 3vw, 40px);
  --section-space: clamp(72px, 9vw, 132px);
  --transition-fast: 180ms ease;
  --transition-reveal: 620ms cubic-bezier(0.2, 0.75, 0.25, 1);
}

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

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  overflow-x: clip;
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  padding: 0;
  overflow-x: clip;
  background: var(--color-page);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

img {
  height: auto;
}

svg {
  flex-shrink: 0;
}

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

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

button {
  color: inherit;
}

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

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

p {
  margin-bottom: 1.15em;
}

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

strong {
  font-weight: 650;
  color: var(--color-text);
}

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

:not(pre) > code {
  padding: 0.12em 0.38em;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-text);
  font-size: 0.9em;
}

pre {
  display: block;
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.75;
  -webkit-overflow-scrolling: touch;
}

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

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

h1 {
  margin-bottom: 20px;
  font-size: clamp(34px, 3.3vw, 48px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 760;
  line-height: 1.2;
  letter-spacing: -0.018em;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(21px, 2vw, 26px);
  font-weight: 720;
  line-height: 1.3;
  letter-spacing: -0.012em;
}

h4 {
  margin-bottom: 8px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
}

.keyword-lock {
  white-space: nowrap;
}

.gradient-word {
  background: linear-gradient(112deg, var(--color-accent), var(--color-accent-deep));
  color: transparent;
  background-clip: text;
  -webkit-background-clip: text;
}

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

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

.wide-wrap {
  width: 100%;
  max-width: min(100%, calc(var(--header-wide) + 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(48px, 6vw, 80px);
  padding-bottom: clamp(48px, 6vw, 80px);
}

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

.panel {
  padding: clamp(24px, 5vw, 48px);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  color: var(--color-text);
}

.card {
  min-width: 0;
  padding: clamp(22px, 3vw, 32px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-page);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
}

.card-lift {
  box-shadow: var(--shadow-lift);
}

.eyebrow,
.badge {
  display: inline-flex;
  max-width: 100%;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-muted);
  font-size: 12.5px;
  font-weight: 650;
  line-height: 1.35;
}

.eyebrow::before,
.status-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-soft);
  content: "";
}

.badge-accent {
  border-color: var(--color-accent-line);
  background: var(--color-accent-soft);
  color: var(--color-accent-deep);
}

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

.badge-error {
  border-color: var(--color-error);
  background: var(--color-error-soft);
  color: var(--color-text);
}

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

.lead {
  max-width: 680px;
  color: var(--color-muted);
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.72;
}

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

.button {
  display: inline-flex;
  min-height: 50px;
  max-width: 100%;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 23px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.button svg {
  width: 18px;
  height: 18px;
}

.button.button-primary {
  border-color: var(--color-accent-deep);
  background: linear-gradient(180deg, var(--color-accent), var(--color-accent-deep));
  color: var(--color-on-accent);
  box-shadow: 0 1px 2px var(--color-accent-line), 0 10px 24px -6px var(--color-accent-glow);
}

.button-secondary {
  border-color: var(--color-border);
  background: var(--color-page);
  color: var(--color-text);
  box-shadow: var(--shadow-soft);
}

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

.button:focus-visible,
.site-nav a:focus-visible,
.header-tool:focus-visible,
.mobile-nav a:focus-visible {
  outline: 3px solid var(--color-accent-line);
  outline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-height);
  background: var(--color-header-glass);
  color: var(--color-text);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.header-shell {
  position: relative;
  z-index: 3;
  display: flex;
  width: 100%;
  max-width: min(100%, calc(var(--header-wide) + var(--gutter) * 2));
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  align-items: center;
  gap: 20px;
}

.site-brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 11px;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 750;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.site-brand img,
.brand-placeholder {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border-radius: var(--radius-pill);
  object-fit: cover;
  box-shadow: 0 2px 6px var(--color-accent-line);
}

.brand-placeholder {
  background: linear-gradient(145deg, var(--color-accent), var(--color-accent-deep));
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 7px;
  padding: 9px 12px;
  border-radius: var(--radius-pill);
  color: var(--color-text);
  font-size: 14px;
  font-weight: 550;
  transition: background var(--transition-fast);
}

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

.site-nav a[aria-current="page"] {
  font-weight: 700;
}

.site-nav svg {
  width: 16px;
  height: 16px;
  color: var(--color-muted);
}

.site-nav a[aria-current="page"] svg {
  color: var(--color-accent-deep);
}

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

.header-tool {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 8px 13px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-page);
  color: var(--color-text);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
}

.header-tool svg {
  width: 16px;
  height: 16px;
  color: var(--color-muted);
}

.language-wrap {
  position: relative;
}

.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  z-index: 5;
  width: 180px;
  margin: 0;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-page);
  color: var(--color-text);
  box-shadow: var(--shadow-lift);
  list-style: none;
}

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

.language-menu a {
  display: flex;
  width: 100%;
  min-height: 44px;
  align-items: center;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

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

.lang-short {
  display: none;
}

.menu-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  padding: 9px;
}

.menu-toggle-lines {
  display: grid;
  width: 20px;
  gap: 4px;
}

.menu-toggle-lines i {
  display: block;
  width: 20px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-text);
}

.mobile-nav {
  position: fixed;
  top: var(--header-height);
  right: 0;
  left: 0;
  z-index: 2;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  padding: 14px var(--gutter) 22px;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-top: 1px solid var(--color-border);
  background: var(--color-page);
  color: var(--color-text);
  box-shadow: var(--shadow-lift);
}

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

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

.mobile-nav a {
  display: flex;
  width: 100%;
  min-height: 48px;
  align-items: center;
  gap: 10px;
  padding: 11px 12px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

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

.mobile-nav svg {
  width: 18px;
  height: 18px;
  color: var(--color-muted);
}

.mobile-language-list {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--color-border);
}

.nav-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 1;
  display: none;
  background: var(--color-ink-22);
}

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

.site-footer {
  margin-top: var(--section-space);
  padding-top: 64px;
  padding-bottom: 28px;
  overflow-x: clip;
  background: var(--color-panel);
  color: var(--color-text);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.8fr 1.2fr 0.8fr;
  gap: clamp(28px, 5vw, 64px);
}

.footer-brand p {
  max-width: 390px;
  margin-top: 18px;
  color: var(--color-muted);
}

.footer-title {
  margin-bottom: 14px;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 750;
}

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

.footer-links a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  color: var(--color-muted);
  font-size: 14px;
}

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

.footer-bottom {
  display: flex;
  margin-top: 46px;
  padding-top: 22px;
  border-top: 1px solid var(--color-border);
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  color: var(--color-muted);
  font-size: 12.5px;
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

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

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

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

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

.data-table th {
  background: var(--color-panel);
  color: var(--color-text);
  font-weight: 700;
}

.prose {
  min-width: 0;
}

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

.prose h2 {
  margin-top: 2.2em;
  scroll-margin-top: calc(var(--header-height) + 24px);
}

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

.tilt-card {
  transform: rotate(-2deg);
}

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

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

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

@media (max-width: 768px) {
  h1 {
    font-size: clamp(24px, 7vw, 30px);
    line-height: 1.16;
    letter-spacing: -0.015em;
  }

  h2 {
    font-size: clamp(25px, 7vw, 31px);
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }

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

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

  .tilt-card {
    transform: none;
  }

  .button-row {
    align-items: stretch;
  }

  .button-row .button {
    flex: 1 1 100%;
  }

  .lang-full {
    display: none;
  }

  .lang-short {
    display: inline;
  }

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

  .footer-brand {
    grid-column: auto;
  }

  .data-table {
    min-width: 620px;
  }
}

@media (max-width: 390px) {
  .site-brand span {
    display: none;
  }

  .header-tool {
    padding-inline: 11px;
  }
}

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

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

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