:root {
  --color-bg: #06343B;
  --color-panel: #0A434C;
  --color-panel-raised: #0F525C;
  --color-border: #1D5F68;
  --color-accent: #FF5A2E;
  --color-accent-dark: #D9431C;
  --color-text: #F1F8F7;
  --color-text-muted: #A3C4C2;
  --color-success: #35D49A;
  --color-warning: #FFC24B;
  --color-error: #FF6B6B;
  --color-paper: #FCFDFC;
  --color-paper-soft: #F1F6F4;
  --color-paper-deep: #E6EEEC;
  --color-paper-line: #DCE6E4;
  --color-ink: #0B3138;
  --color-ink-muted: #59777C;
  --color-flag-red: #D8404B;
  --color-flag-navy: #27356E;
  --color-flag-blue: #2B4C93;
  --color-flag-white: #F7F9F8;
  --color-shadow: rgba(1, 20, 24, 0.5);
  --color-shadow-soft: rgba(1, 20, 24, 0.35);
  --color-shadow-faint: rgba(1, 20, 24, 0.2);
  --color-accent-glow: rgba(255, 90, 46, 0.24);
  --color-accent-shadow: rgba(255, 90, 46, 0.35);
  --color-dot: rgba(163, 196, 194, 0.14);
  --color-focus-backdrop: rgba(6, 52, 59, 0.68);
  --font-display: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  --radius-xl: 26px;
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --radius-pill: 999px;
  --shadow-deep: 0 42px 80px var(--color-shadow), 0 12px 28px var(--color-shadow-soft);
  --shadow-soft: 0 18px 40px var(--color-shadow-soft);
  --shadow-card: 0 14px 30px var(--color-shadow);
  --shadow-cta: 0 10px 28px var(--color-accent-shadow);
  --layout-max: 1320px;
  --content-max: 920px;
  --header-height: 76px;
  --gutter: clamp(16px, 3vw, 36px);
  --section-space: clamp(64px, 9vw, 120px);
  --focus-width: 2px;
  --motion-fast: 150ms;
  --motion-base: 420ms;
}

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

html {
  min-width: 320px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 16px);
}

html.nav-open {
  overflow: hidden;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: clip;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

img {
  height: auto;
}

svg {
  flex-shrink: 0;
}

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

button,
summary,
select {
  cursor: pointer;
}

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

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

ul,
ol {
  padding-left: 1.3em;
}

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

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

h1,
.hero-title {
  margin-bottom: 20px;
  font-size: clamp(52px, 5vw, 72px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.18;
}

h3 {
  margin-bottom: 12px;
  font-size: clamp(21px, 2.4vw, 28px);
  font-weight: 800;
  line-height: 1.25;
}

p {
  margin-bottom: 1.15em;
}

strong {
  color: var(--color-text);
  font-weight: 750;
}

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

code {
  overflow-wrap: anywhere;
}

pre {
  max-width: 100%;
  padding: 20px;
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  color: var(--color-text);
  -webkit-overflow-scrolling: touch;
}

hr {
  margin: 32px 0;
  border: 0;
  border-top: 1px solid var(--color-border);
}

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

:where(a, button, summary, input, select, textarea, [role="tab"]):focus-visible {
  outline: var(--focus-width) solid var(--color-accent);
  outline-offset: 3px;
}

.no-break {
  white-space: nowrap;
}

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

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

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

.wrap {
  width: 100%;
  max-width: var(--layout-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

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

.section-tight {
  padding-top: clamp(44px, 6vw, 72px);
  padding-bottom: clamp(44px, 6vw, 72px);
  overflow-x: clip;
}

.section-head {
  max-width: 760px;
  margin-bottom: 38px;
}

.section-kicker {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
}

.panel-raised {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-panel-raised);
  box-shadow: var(--shadow-soft);
}

.paper-panel {
  border-radius: var(--radius-xl);
  background: var(--color-paper);
  color: var(--color-ink);
  box-shadow: var(--shadow-soft);
}

.paper-panel h2,
.paper-panel h3,
.paper-panel strong {
  color: var(--color-ink);
}

.card {
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
}

.grid-2,
.grid-3 {
  display: grid;
  gap: 24px;
}

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

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.badge,
.status-badge,
.tag {
  display: inline-flex;
  min-height: 28px;
  max-width: 100%;
  align-items: center;
  gap: 7px;
  padding: 4px 11px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-text-muted);
  font-size: 12px;
  font-weight: 700;
  overflow-wrap: anywhere;
}

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

.status-badge {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: var(--color-text);
}

.btn,
.btn-primary,
.btn-secondary,
.btn-quiet {
  display: inline-flex;
  min-width: 24px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 25px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
  transition:
    transform var(--motion-fast) ease,
    background-color var(--motion-fast) ease,
    border-color var(--motion-fast) ease,
    color var(--motion-fast) ease;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-text);
  box-shadow: var(--shadow-cta);
}

.btn-primary:hover {
  transform: translateY(-1px);
  background: var(--color-accent-dark);
}

.btn-secondary {
  border-color: var(--color-border);
  background: transparent;
  color: var(--color-text);
}

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

.btn-quiet {
  border-color: var(--color-border);
  background: var(--color-panel);
  color: var(--color-text);
}

.btn[aria-disabled="true"],
.btn:disabled {
  cursor: not-allowed;
  opacity: 0.58;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

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

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

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

.site-head {
  position: relative;
  z-index: 40;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.head-row {
  position: relative;
  display: flex;
  width: 100%;
  max-width: var(--layout-max);
  min-height: var(--header-height);
  align-items: center;
  gap: 28px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.brand {
  display: inline-flex;
  min-height: 44px;
  flex: 0 0 auto;
  align-items: center;
  gap: 11px;
  margin-right: auto;
}

.brand-logo {
  display: block;
  width: 34px;
  height: 34px;
}

.brand-copy {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
}

.brand-name {
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.brand-local {
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 600;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 25px;
}

.desktop-nav a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 13px;
  font-weight: 550;
  transition: color var(--motion-fast) ease;
}

.desktop-nav a:hover,
.desktop-nav a.is-active {
  color: var(--color-text);
}

.desktop-nav a.is-active {
  font-weight: 750;
}

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

.language-picker {
  position: relative;
}

.language-toggle,
.menu-toggle {
  display: inline-flex;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--color-text-muted);
}

.language-toggle {
  gap: 6px;
  padding-inline: 10px;
  font-size: 13px;
}

.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 60;
  display: none;
  width: 168px;
  padding: 8px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-panel);
  box-shadow: var(--shadow-card);
}

.language-picker.is-open .language-menu {
  display: block;
}

.language-menu a {
  display: flex;
  min-height: 42px;
  align-items: center;
  padding: 8px 11px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.login-button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
  color: var(--color-text);
  font-size: 13px;
  font-weight: 800;
}

.login-button:hover {
  border-color: var(--color-accent);
  background: var(--color-panel-raised);
}

.menu-toggle {
  display: none;
  padding: 9px;
  border: 1px solid var(--color-border);
}

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

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

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

.menu-toggle-lines::before {
  top: -6px;
}

.menu-toggle-lines::after {
  top: 6px;
}

.mobile-nav {
  position: absolute;
  top: 100%;
  right: var(--gutter);
  left: var(--gutter);
  z-index: 55;
  display: none;
  max-height: calc(100dvh - var(--header-height));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-panel);
  box-shadow: var(--shadow-deep);
}

.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: 46px;
  align-items: center;
  padding: 11px 13px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
}

.mobile-nav a:hover,
.mobile-nav a.is-active {
  background: var(--color-panel-raised);
  color: var(--color-text);
}

.mobile-language-list {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
}

.nav-veil {
  position: fixed;
  inset: var(--header-height) 0 0;
  z-index: 30;
  display: none;
  border: 0;
  background: var(--color-focus-backdrop);
}

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

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

.footer-main {
  display: grid;
  grid-template-columns: minmax(240px, 1.2fr) repeat(3, minmax(150px, 1fr));
  gap: 42px;
  padding-top: 64px;
  padding-bottom: 48px;
}

.footer-brand {
  max-width: 330px;
}

.footer-brand .brand {
  margin-bottom: 18px;
}

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

.footer-title {
  margin-bottom: 15px;
  color: var(--color-text);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.footer-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links li + li {
  margin-top: 7px;
}

.footer-links a {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  color: var(--color-text-muted);
  font-size: 13px;
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 20px;
  padding-bottom: 24px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 12px;
}

.footer-legal,
.footer-language {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.footer-bottom a {
  min-height: 24px;
}

.prose {
  color: var(--color-text-muted);
  font-size: 16px;
}

.prose h2,
.prose h3 {
  margin-top: 2em;
  scroll-margin-top: calc(var(--header-height) + 78px);
}

.prose a:not(.btn):not(.btn-primary):not(.btn-secondary) {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 3px;
}

.prose li + li {
  margin-top: 8px;
}

.prose img {
  border-radius: var(--radius-lg);
}

@media (max-width: 1120px) {
  .desktop-nav {
    gap: 15px;
  }

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

  .language-toggle {
    width: 44px;
    padding-inline: 0;
    overflow: hidden;
    font-size: 0;
  }

  .language-toggle::before {
    content: "文";
    font-size: 13px;
  }
}

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

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

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

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

@media (max-width: 768px) {
  h1,
  .hero-title {
    font-size: clamp(28px, 9.7vw, 40px);
    line-height: 1.14;
  }

  h2 {
    font-size: clamp(27px, 8vw, 36px);
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 640px) {
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .head-row {
    gap: 10px;
  }

  .brand-copy {
    gap: 4px;
  }

  .brand-local {
    display: none;
  }

  .login-button {
    min-width: 58px;
    padding-inline: 13px;
  }

  .footer-main {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

  .button-row > a,
  .button-row > button {
    flex: 1 1 150px;
  }

  .paper-panel,
  .panel,
  .panel-raised,
  .card {
    max-width: 100%;
  }

  pre {
    padding: 16px;
  }
}

@media (max-width: 380px) {
  .brand-logo {
    width: 30px;
    height: 30px;
  }

  .brand-name {
    font-size: 17px;
  }

  .head-tools {
    gap: 5px;
  }

  .login-button {
    min-width: 52px;
    padding-inline: 10px;
  }
}

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

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

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