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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

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

ul[class], ol[class], [role="list"] {
  list-style: none;
  padding: 0;
}

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

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

button {
  cursor: pointer;
}

a {
  color: var(--color-primary);
}

:root {
  --color-bg: #F5F0E6;
  --color-ink: #1A1A1A;
  --color-primary: #0052CC;
  --color-primary-dark: #003B99;
  --color-accent: #FF6B00;
  --color-accent-dark: #E05A00;
  --color-highlight: #39FF14;
  --color-line: #E0D8C8;
  --color-surface: #FFFFFF;
  --color-muted: #6B6B6B;

  --font-sans: "Noto Sans SC", "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", "Consolas", monospace;

  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-pill: 999px;
  --shadow-card: 0 12px 32px -20px rgba(26, 26, 26, 0.18);
  --container: 1200px;
  --container-sm: 880px;
  --container-pad: clamp(1rem, 4vw, 2.5rem);
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-ink);
  background: var(--color-bg);
  word-break: break-word;
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-ink);
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

#main-content {
  scroll-margin-top: 2rem;
}

[data-section] {
  scroll-margin-top: 2rem;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  z-index: 200;
  transform: translateY(-150%);
  background: var(--color-ink);
  color: var(--color-bg);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-pill);
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: none;
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.container-sm {
  max-width: var(--container-sm);
  margin-inline: auto;
}

.section {
  padding-block: clamp(2.5rem, 6vw, 5rem);
}

.section-head {
  max-width: 44rem;
  margin-bottom: clamp(1.5rem, 3.5vw, 2.5rem);
}

.section-head > * + * {
  margin-top: 0.5rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.eyebrow::before {
  content: "";
  width: 2rem;
  height: 2px;
  background: var(--color-accent);
  border-radius: 999px;
}

.grid-2,
.grid-3,
.grid-4 {
  display: grid;
  gap: clamp(1rem, 2.6vw, 1.75rem);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

@media (min-width: 900px) {
  .split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

  .split.is-flipped {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .split.is-flipped > *:first-child {
    order: 2;
  }

  .split.is-flipped > *:last-child {
    order: 1;
  }
}

.card {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-card);
}

.card-pad {
  padding: clamp(1.25rem, 3vw, 2rem);
}

.card-blue {
  background: var(--color-primary);
  border-color: transparent;
  color: #FFFFFF;
}

.card-orange {
  background: var(--color-accent);
  border-color: transparent;
  color: #FFFFFF;
}

.card-ink {
  background: var(--color-ink);
  border-color: transparent;
  color: #FFFFFF;
}

.card-blue h1, .card-blue h2, .card-blue h3, .card-blue h4,
.card-orange h1, .card-orange h2, .card-orange h3, .card-orange h4,
.card-ink h1, .card-ink h2, .card-ink h3, .card-ink h4 {
  color: #FFFFFF;
}

.card-blue a, .card-orange a, .card-ink a {
  color: rgba(255, 255, 255, 0.85);
}

.card-blue a:hover, .card-orange a:hover, .card-ink a:hover {
  color: var(--color-highlight);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  font-weight: 700;
  font-size: 0.9375rem;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -12px rgba(0, 82, 204, 0.5);
}

.btn-accent {
  background: var(--color-accent);
  color: #FFFFFF;
}

.btn-accent:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -12px rgba(255, 107, 0, 0.5);
}

.btn-ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-ink);
}

.btn-ghost:hover {
  background: var(--color-ink);
  color: var(--color-bg);
}

.kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.badge-live {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-pill);
  background: rgba(57, 255, 20, 0.12);
  color: var(--color-ink);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.badge-live::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--color-highlight);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.25);
}

.prose {
  max-width: 46rem;
}

.prose > p + p {
  margin-top: 1.25em;
}

.prose h2 {
  margin-top: 2.2em;
}

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

.prose ul,
.prose ol {
  margin: 1em 0 1.5em;
  padding-left: 1.25rem;
}

.prose li + li {
  margin-top: 0.5em;
}

.prose a {
  text-decoration: underline;
  text-underline-offset: 0.25rem;
}

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-ink);
}

.media-frame img,
.media-frame .media-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame .media-placeholder {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  min-height: 100%;
  color: rgba(255, 255, 255, 0.65);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-align: center;
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0 8px, transparent 8px 16px),
    var(--color-ink);
}

.ratio-16x9 {
  aspect-ratio: 16 / 9;
}

.ratio-4x3 {
  aspect-ratio: 4 / 3;
}

.ratio-square {
  aspect-ratio: 1 / 1;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
}

.breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--color-muted);
  font-family: var(--font-mono);
}

.breadcrumb [aria-current="page"] {
  color: var(--color-ink);
  font-weight: 700;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
}

.toc a,
.toc button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-pill);
  border: 0;
  background: transparent;
  color: var(--color-ink);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.toc a::before,
.toc button::before {
  content: "#";
  color: var(--color-primary);
  font-family: var(--font-mono);
}

.toc a:hover,
.toc button:hover {
  background: var(--color-bg);
}

.toc a.is-active,
.toc button.is-active {
  background: var(--color-primary);
  color: #FFFFFF;
}

.toc a.is-active::before,
.toc button.is-active::before {
  color: var(--color-highlight);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

.site-header {
  position: relative;
  background: var(--color-bg);
}

.site-header::after {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0 45%, var(--color-accent) 45% 72%, var(--color-highlight) 72% 100%);
}

.topbar {
  background: var(--color-ink);
  color: var(--color-bg);
  font-size: 0.8125rem;
}

.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-block: 0.625rem;
}

.topbar-tagline {
  margin: 0;
  letter-spacing: 0.04em;
}

.topbar-link {
  color: var(--color-highlight);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.topbar-link:hover {
  color: var(--color-accent);
}

.header-main {
  border-bottom: 1px solid var(--color-line);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding-block: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-ink);
}

.brand-mark {
  position: relative;
  display: block;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  background: var(--color-primary);
  border-radius: 50% 50% 50% 50% / 60% 40% 60% 40%;
  transform: rotate(-8deg);
}

.brand-mark::before {
  content: "";
  position: absolute;
  inset: 7px;
  border: 2px solid rgba(255, 255, 255, 0.85);
  border-radius: 50%;
}

.brand-mark::after {
  content: "";
  position: absolute;
  right: -10px;
  top: 6px;
  width: 18px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 999px;
  transform: rotate(-16deg);
}

.brand-mark-sm {
  width: 38px;
  height: 38px;
}

.brand-wing {
  position: absolute;
  display: block;
  height: 3px;
  border-radius: 999px;
}

.brand-wing-a {
  right: -12px;
  bottom: 4px;
  width: 14px;
  background: var(--color-accent);
  transform: rotate(14deg);
}

.brand-wing-b {
  left: -8px;
  top: 2px;
  width: 9px;
  background: var(--color-highlight);
  transform: rotate(28deg);
}

.brand-lockup {
  display: inline-flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.brand-subname {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-top: 0.125rem;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  background: var(--color-ink);
  border: 0;
  border-radius: 14px;
}

.nav-toggle-lines {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle-lines i {
  display: block;
  width: 22px;
  height: 2px;
  background: #FFFFFF;
  border-radius: 999px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-header[data-nav-open] .nav-toggle-lines i:nth-child(1),
.nav-toggle[aria-expanded="true"] .nav-toggle-lines i:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header[data-nav-open] .nav-toggle-lines i:nth-child(2),
.nav-toggle[aria-expanded="true"] .nav-toggle-lines i:nth-child(2) {
  opacity: 0;
}

.site-header[data-nav-open] .nav-toggle-lines i:nth-child(3),
.nav-toggle[aria-expanded="true"] .nav-toggle-lines i:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.header-nav {
  background: var(--color-primary);
  color: #FFFFFF;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 0.75rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-block;
  padding: 0.625rem 1rem;
  border-radius: var(--radius-pill);
  color: rgba(255, 255, 255, 0.92);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9375rem;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
  background: rgba(255, 255, 255, 0.14);
  color: #FFFFFF;
}

.nav-link[aria-current="page"] {
  background: var(--color-accent);
  color: #FFFFFF;
}

.nav-note {
  margin: 0;
  padding-left: 1rem;
  border-left: 1px solid rgba(255, 255, 255, 0.3);
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.8125rem;
  line-height: 1.4;
  max-width: 220px;
}

@media (min-width: 900px) {
  .nav-toggle {
    display: none;
  }
}

@media (max-width: 899.98px) {
  .header-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 80;
    display: none;
  }

  .site-header[data-nav-open] .header-nav,
  .header-nav[data-open] {
    display: block;
  }

  .nav-wrap {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    padding-block: 1rem;
  }

  .nav-links {
    flex-direction: column;
    gap: 0.25rem;
  }

  .nav-link {
    display: block;
    padding: 0.875rem 1rem;
  }

  .nav-note {
    border-left: 0;
    border-top: 1px solid rgba(255, 255, 255, 0.3);
    padding: 0.75rem 0 0;
    max-width: none;
  }
}

.site-footer {
  position: relative;
  background: var(--color-ink);
  color: rgba(245, 240, 230, 0.78);
}

.site-footer::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0 30%, var(--color-accent) 30% 55%, var(--color-highlight) 55% 100%);
}

.site-footer a {
  color: rgba(245, 240, 230, 0.82);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--color-highlight);
}

.footer-grid {
  display: grid;
  gap: 2rem;
  padding-block: 3rem 2rem;
}

@media (min-width: 760px) {
  .footer-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.9fr) minmax(0, 1.2fr);
  }
}

.footer-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-highlight);
  margin-bottom: 0.75rem;
}

.footer-brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: #FFFFFF;
  margin-bottom: 1rem;
}

.site-footer .brand-name {
  color: #FFFFFF;
}

.site-footer .brand-subname {
  color: var(--color-highlight);
}

.footer-desc {
  max-width: 34rem;
  margin-bottom: 1rem;
}

.footer-trust {
  border-left: 3px solid var(--color-accent);
  padding-left: 1rem;
  color: rgba(245, 240, 230, 0.65);
  font-size: 0.875rem;
  max-width: 34rem;
}

.footer-nav a {
  display: block;
  padding-block: 0.375rem;
}

.footer-contact p {
  margin-bottom: 0.375rem;
  font-size: 0.9375rem;
}

.footer-hours {
  font-size: 0.8125rem;
  color: rgba(245, 240, 230, 0.55);
  margin-top: 0.5rem;
}

.footer-bottom {
  border-top: 1px solid rgba(245, 240, 230, 0.15);
  padding-block: 1.25rem;
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: rgba(245, 240, 230, 0.6);
}

.footer-legal {
  display: flex;
  gap: 1rem;
}

.footer-legal a {
  color: rgba(245, 240, 230, 0.8);
}

.footer-icp {
  font-family: var(--font-mono);
  color: rgba(245, 240, 230, 0.5);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@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;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}