:root {
  --color-bg: #071526;
  --color-bg-panel: #0D2034;
  --color-bg-panel-2: #142B42;
  --color-bg-panel-3: #19344D;
  --color-bg-deep: #081A2C;
  --color-border: #29445A;
  --color-border-strong: #3A5A70;
  --color-accent: #38D9B2;
  --color-accent-dark: #159E83;
  --color-accent-soft: #173E42;
  --color-text: #EDF7F6;
  --color-text-muted: #9CB2BE;
  --color-text-faint: #718A99;
  --color-success: #68DFA8;
  --color-warn: #FF765C;
  --color-warn-dark: #D95642;
  --color-error: #F0525F;
  --color-yellow: #E3C56C;
  --color-yellow-soft: #403D2D;
  --color-white-soft: #DCE9E9;
  --color-black: #000000;
  --color-transparent: transparent;
  --color-grid: rgba(56, 217, 178, 0.055);
  --color-glow: rgba(56, 217, 178, 0.14);
  --color-shadow: rgba(0, 0, 0, 0.42);
  --color-shadow-soft: rgba(0, 0, 0, 0.2);
  --color-panel-glass: rgba(13, 32, 52, 0.93);
  --color-panel-muted: rgba(20, 43, 66, 0.72);
  --color-accent-line: rgba(56, 217, 178, 0.34);
  --color-warn-line: rgba(255, 118, 92, 0.32);
  --color-yellow-line: rgba(227, 197, 108, 0.3);
  --color-veil: rgba(0, 0, 0, 0.58);

  --font-display: Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  --radius-xs: 6px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 30px;
  --radius-pill: 999px;

  --shadow-panel: 0 30px 80px var(--color-shadow);
  --shadow-soft: 0 16px 40px var(--color-shadow-soft);
  --shadow-button: 0 12px 28px var(--color-warn-line);
  --shadow-accent: 0 0 36px var(--color-glow);

  --page-width: 1320px;
  --content-width: 920px;
  --nav-height: 78px;
  --gutter: clamp(16px, 4vw, 36px);
  --section-space: clamp(64px, 9vw, 116px);
  --transition-fast: 180ms ease;
  --transition-slow: 520ms cubic-bezier(0.2, 0.75, 0.25, 1);
}

*,
*::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: 100vh;
  margin: 0;
  overflow-x: clip;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  background:
    linear-gradient(var(--color-grid) 1px, var(--color-transparent) 1px),
    linear-gradient(90deg, var(--color-grid) 1px, var(--color-transparent) 1px),
    radial-gradient(circle at 74% 38%, var(--color-glow), var(--color-transparent) 32%),
    var(--color-bg);
  background-size: 48px 48px, 48px 48px, auto, auto;
}

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

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

button {
  border: 0;
}

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

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

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

:not(pre) > code {
  padding: 0.12em 0.4em;
  overflow-wrap: anywhere;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  color: var(--color-accent);
  background: var(--color-bg-deep);
  font-size: 0.88em;
}

pre {
  max-width: 100%;
  padding: 18px 20px;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-white-soft);
  background: var(--color-bg-deep);
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.7;
  tab-size: 2;
}

pre code {
  display: block;
  min-width: max-content;
  padding: 0;
  border: 0;
  background: none;
  overflow-wrap: normal;
}

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

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  color: var(--color-text);
  font-family: var(--font-display);
  line-height: 1.18;
  text-wrap: balance;
}

h1 {
  margin-bottom: 24px;
  font-size: clamp(3.25rem, 6vw, 4.75rem);
  font-weight: 850;
  letter-spacing: -0.055em;
}

h2 {
  margin-bottom: 20px;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.04em;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(1.24rem, 2vw, 1.55rem);
  font-weight: 750;
  letter-spacing: -0.025em;
}

h4 {
  margin-bottom: 8px;
  font-size: 1rem;
}

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

strong {
  color: var(--color-text);
}

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

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

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

.section-compact {
  padding-top: clamp(42px, 6vw, 72px);
  padding-bottom: clamp(42px, 6vw, 72px);
}

.section-head {
  max-width: 760px;
  margin-bottom: 36px;
}

.section-kicker,
.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.section-kicker::before,
.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: var(--shadow-accent);
}

.lead {
  max-width: 720px;
  color: var(--color-text-muted);
  font-size: clamp(1rem, 2vw, 1.16rem);
}

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

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

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

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

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

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

.button {
  min-height: 48px;
  padding: 0 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 750;
  line-height: 1;
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    background-color var(--transition-fast);
}

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

.button svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.button-primary {
  color: var(--color-text);
  border-color: var(--color-warn);
  background: var(--color-warn);
  box-shadow: var(--shadow-button);
}

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

.button-secondary {
  color: var(--color-text);
  background: var(--color-bg-panel-2);
}

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

.button-quiet {
  color: var(--color-accent);
  border-color: var(--color-accent-dark);
  background: var(--color-accent-soft);
}

.button[disabled],
.button.is-disabled {
  color: var(--color-text-faint);
  border-color: var(--color-border);
  background: var(--color-bg-deep);
  box-shadow: none;
  cursor: not-allowed;
  opacity: 0.62;
  transform: none;
}

.panel,
.card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg-panel);
  box-shadow: var(--shadow-soft);
}

.panel {
  padding: clamp(20px, 3vw, 34px);
}

.card {
  padding: 24px;
  transition:
    transform var(--transition-fast),
    border-color var(--transition-fast),
    background-color var(--transition-fast);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-strong);
  background: var(--color-bg-panel-2);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.icon-disc {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border: 1px solid var(--color-accent-dark);
  border-radius: 50%;
  color: var(--color-accent);
  background: var(--color-accent-soft);
}

.icon-disc svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}

.topic-chips,
.badge-row {
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
}

.chip,
.badge {
  max-width: 100%;
  min-height: 28px;
  padding: 5px 10px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
  background: var(--color-bg-deep);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.3;
}

.chip-accent,
.badge-accent {
  color: var(--color-accent);
  border-color: var(--color-accent-dark);
  background: var(--color-accent-soft);
}

.badge-warn {
  color: var(--color-text);
  border-color: var(--color-warn);
  background: var(--color-warn-dark);
}

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

.badge-muted {
  color: var(--color-text-faint);
  background: var(--color-bg-panel-2);
}

.status-dot {
  width: 8px;
  height: 8px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 12px var(--color-success);
}

.site-header {
  position: relative;
  z-index: 50;
  height: var(--nav-height);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-panel-glass);
  box-shadow: 0 8px 28px var(--color-shadow-soft);
  backdrop-filter: blur(16px);
}

.site-header-inner {
  width: min(100%, calc(var(--page-width) + (var(--gutter) * 2)));
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: 24px;
}

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

.site-brand-logo {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  filter: drop-shadow(0 0 10px var(--color-glow));
}

.site-brand-copy {
  display: grid;
  gap: 1px;
}

.site-brand-name {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 750;
  letter-spacing: -0.02em;
}

.site-brand-domain {
  color: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
}

.desktop-nav {
  margin-left: auto;
  padding: 5px;
  display: flex;
  align-items: center;
  gap: 5px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-bg-panel);
}

.nav-link {
  min-height: 38px;
  padding: 0 15px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
  font-size: 0.8rem;
  font-weight: 650;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

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

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--color-text);
  background: var(--color-bg-panel-2);
}

.nav-link[aria-current="page"] {
  box-shadow: inset 0 0 0 1px var(--color-accent-line);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
}

.language-menu {
  position: relative;
}

.language-button,
.menu-toggle {
  min-height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
  background: var(--color-bg-panel);
  cursor: pointer;
}

.language-button {
  padding: 0 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 650;
}

.language-button svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}

.language-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 176px;
  padding: 7px;
  display: none;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-bg-panel);
  box-shadow: var(--shadow-panel);
}

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

.language-dropdown a {
  min-height: 42px;
  padding: 8px 11px;
  display: flex;
  align-items: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.language-dropdown a:hover,
.language-dropdown a[aria-current="true"] {
  color: var(--color-text);
  background: var(--color-bg-panel-2);
}

.menu-toggle {
  width: 44px;
  min-width: 44px;
  padding: 0;
  display: none;
  place-items: center;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  width: 18px;
  height: 2px;
  display: block;
  border-radius: var(--radius-pill);
  background: var(--color-text);
  transition: transform var(--transition-fast);
}

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

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

.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 {
  top: 0;
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::after {
  top: 0;
  transform: rotate(-45deg);
}

.mobile-nav {
  position: absolute;
  z-index: 55;
  top: var(--nav-height);
  right: 0;
  left: 0;
  max-height: calc(100dvh - var(--nav-height));
  padding: 14px var(--gutter) 20px;
  display: none;
  overflow-y: auto;
  overscroll-behavior: contain;
  border-bottom: 1px solid var(--color-border-strong);
  background: var(--color-bg-panel);
  box-shadow: var(--shadow-panel);
}

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

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

.mobile-nav a {
  width: 100%;
  min-height: 48px;
  padding: 11px 13px;
  display: flex;
  align-items: center;
  gap: 11px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-weight: 650;
}

.mobile-nav a:hover,
.mobile-nav a[aria-current="page"],
.mobile-nav a[aria-current="true"] {
  color: var(--color-text);
  background: var(--color-bg-panel-2);
}

.mobile-nav a svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
}

.mobile-language-title {
  margin: 15px 12px 7px;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

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

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

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

.site-footer::before {
  content: "";
  position: absolute;
  top: -220px;
  left: 12%;
  width: 460px;
  height: 460px;
  border: 1px solid var(--color-accent-line);
  border-radius: 50%;
  opacity: 0.3;
  pointer-events: none;
}

.footer-inner {
  position: relative;
  width: min(100%, calc(var(--page-width) + (var(--gutter) * 2)));
  margin-inline: auto;
  padding: 64px var(--gutter) 26px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 1.35fr 0.8fr;
  gap: 44px;
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 13px;
}

.footer-logo {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
}

.footer-title {
  margin-bottom: 7px;
  font-family: var(--font-display);
  font-weight: 800;
}

.footer-copy {
  max-width: 320px;
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.7;
}

.footer-heading {
  margin-bottom: 15px;
  color: var(--color-text-faint);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  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: 0.84rem;
  transition: color var(--transition-fast);
}

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

.footer-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-keywords a {
  max-width: 100%;
  padding: 5px 9px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text-muted);
  background: var(--color-bg-panel);
  font-family: var(--font-mono);
  font-size: 0.66rem;
}

.footer-bottom {
  margin-top: 44px;
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-faint);
  font-size: 0.75rem;
}

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

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity var(--transition-slow),
    transform var(--transition-slow);
}

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

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

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

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

.prose h2 {
  margin-top: 2.6em;
  scroll-margin-top: calc(var(--nav-height) + 24px);
}

.prose h3 {
  margin-top: 2em;
  scroll-margin-top: calc(var(--nav-height) + 24px);
}

.prose p,
.prose li {
  overflow-wrap: break-word;
}

.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-line);
  text-underline-offset: 0.2em;
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.data-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  color: var(--color-text-muted);
  background: var(--color-bg-panel);
  font-size: 0.86rem;
}

.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-text);
  background: var(--color-bg-panel-2);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

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

@media (max-width: 1080px) {
  .desktop-nav {
    display: none;
  }

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

  .menu-toggle {
    display: grid;
  }

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

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

@media (max-width: 640px) {
  :root {
    --nav-height: 68px;
    --gutter: 16px;
  }

  body {
    background-size: 36px 36px, 36px 36px, auto, auto;
  }

  h1 {
    font-size: clamp(2.65rem, 13.5vw, 3.75rem);
  }

  h2 {
    font-size: clamp(1.85rem, 9vw, 2.5rem);
  }

  .site-header-inner {
    gap: 10px;
  }

  .site-brand {
    gap: 9px;
  }

  .site-brand-logo {
    width: 36px;
    height: 36px;
  }

  .site-brand-name {
    font-size: 0.91rem;
  }

  .site-brand-domain {
    display: none;
  }

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

  .language-button {
    width: 44px;
    min-width: 44px;
    padding: 0;
    justify-content: center;
  }

  .language-button span {
    display: none;
  }

  .language-dropdown {
    display: none !important;
  }

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

  .button-row .button {
    flex: 1 1 148px;
  }

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

  .footer-inner {
    padding-top: 48px;
  }

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

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

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

  .section,
  .section-compact,
  .site-footer,
  .hero,
  [class*="hero"],
  [class*="stage"],
  [class*="visual"] {
    overflow-x: clip;
  }

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

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

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

  .reveal {
    transform: none;
  }
}