*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: 'Noto Sans SC Regular', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: #0D0D0F;
  color: #F5F5F7;
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

ul, ol {
  list-style: none;
}

a {
  color: #00B4D8;
  text-decoration: none;
}

a:hover {
  color: #E63946;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

address {
  font-style: normal;
}

:focus-visible {
  outline: 2px solid #00B4D8;
  outline-offset: 4px;
  border-radius: 4px;
}

#main-content {
  scroll-margin-top: 88px;
}

:root {
  --color-primary: #E63946;
  --color-bg: #0D0D0F;
  --color-card: #1A1A1D;
  --color-border: #C0C0C8;
  --color-accent: #00B4D8;
  --color-primary-dark: #8A1C1C;
  --color-text: #F5F5F7;
  --color-muted: #C0C0C8;
  --color-subtle: #2B2B30;
  --font-heading: 'Noto Sans SC Black', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'Noto Sans SC Regular', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --container-max: 1280px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --ease: cubic-bezier(.22, 1, .36, 1);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: #E63946;
  color: #FFFFFF;
  padding: 12px 20px;
  font-weight: 700;
  border-radius: 0 0 12px 0;
}

.skip-link:focus {
  left: 0;
  color: #FFFFFF;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(13, 13, 15, .92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(192, 192, 200, .15);
}

.header-shell {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 64px;
  position: relative;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text);
  flex-shrink: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: #FFFFFF;
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 900;
  border-radius: 12px;
  transform: rotate(-6deg);
  box-shadow: 4px 4px 0 var(--color-primary-dark);
  transition: transform .3s var(--ease);
}

.brand-link:hover .brand-mark {
  transform: rotate(0deg) scale(1.05);
}

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

.brand-text {
  font-family: var(--font-heading);
  font-size: 22px;
  letter-spacing: .02em;
  color: var(--color-text);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: var(--color-muted);
  margin-top: 2px;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 8px;
  padding: 6px 12px;
  border: 1px solid rgba(192, 192, 200, .18);
  border-radius: 999px;
  background: rgba(26, 26, 29, .6);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--color-muted);
  flex-shrink: 0;
}

.header-status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent);
  animation: pulse 2.4s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .35; }
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--color-text);
  border-radius: 999px;
  border: 1px solid rgba(192, 192, 200, .2);
  background: rgba(26, 26, 29, .6);
  flex-shrink: 0;
}

.nav-toggle-line {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  position: relative;
  transition: background .2s;
}

.nav-toggle-line::before,
.nav-toggle-line::after {
  content: '';
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--color-text);
  transition: transform .3s var(--ease);
}

.nav-toggle-line::before {
  top: -6px;
}

.nav-toggle-line::after {
  top: 6px;
}

.site-header[data-open] .nav-toggle-line {
  background: transparent;
}

.site-header[data-open] .nav-toggle-line::before {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open] .nav-toggle-line::after {
  transform: translateY(-6px) rotate(-45deg);
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-muted);
  border-radius: 999px;
  white-space: nowrap;
  transition: background .2s, color .2s, box-shadow .2s;
  position: relative;
}

.nav-link::before {
  content: attr(data-index);
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--color-accent);
  letter-spacing: .06em;
  opacity: .75;
}

.nav-link:hover {
  color: var(--color-text);
  background: var(--color-card);
}

.nav-link[aria-current="page"] {
  color: var(--color-text);
  background: var(--color-card);
  box-shadow: inset 0 0 0 1px rgba(230, 57, 70, .35);
}

.nav-link[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background .2s, border-color .2s;
}

.btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 4px 0 var(--color-primary-dark);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 0 var(--color-primary-dark);
  color: #FFFFFF;
}

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

.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-text);
}

.header-cta {
  margin-left: 12px;
  flex-shrink: 0;
}

.header-cta:hover {
  color: #FFFFFF;
}

.header-cta-bracket {
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(255, 255, 255, .75);
}

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
  background: transparent;
}

.header-progress-fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width .1s linear;
}

.site-footer {
  background: #0A0A0C;
  border-top: 2px solid var(--color-primary);
  position: relative;
  margin-top: auto;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 0;
  width: 120px;
  height: 2px;
  background: var(--color-accent);
}

.footer-shell {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 2fr 1fr 1.2fr;
  gap: 48px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-size: 28px;
  color: var(--color-text);
}

.footer-brand::before {
  content: '';
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 14px var(--color-primary);
}

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

.footer-tagline {
  margin-top: 12px;
  max-width: 36em;
  color: var(--color-muted);
  font-size: 14px;
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 16px;
  border-left: 3px solid var(--color-primary);
  padding-left: 12px;
}

.footer-link-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 16px;
}

.footer-link-list a {
  display: inline-block;
  color: var(--color-muted);
  font-size: 14px;
  padding: 4px 0;
  transition: color .2s, transform .2s var(--ease);
}

.footer-link-list a:hover {
  color: var(--color-primary);
  transform: translateX(4px);
}

.footer-contact p {
  color: var(--color-muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.footer-icp {
  font-family: var(--font-mono);
  font-size: 12px;
  padding-top: 10px;
  margin-top: 12px;
  border-top: 1px dashed rgba(192, 192, 200, .18);
}

.footer-bottom {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 16px 24px;
  border-top: 1px solid rgba(192, 192, 200, .1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.footer-trust {
  text-align: right;
  max-width: 56ch;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 80px 0;
  position: relative;
}

.section--compact {
  padding: 40px 0;
}

.grid {
  display: grid;
  gap: 24px;
}

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

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

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

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--color-muted);
}

.breadcrumb a {
  color: var(--color-accent);
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: '/';
  margin-right: 8px;
  color: var(--color-muted);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.display-title {
  font-family: var(--font-heading);
  font-size: clamp(40px, 8vw, 88px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--color-text);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.1;
  color: var(--color-text);
}

.card {
  background: var(--color-card);
  border: 1px solid rgba(192, 192, 200, .15);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, .3);
  border-color: rgba(230, 57, 70, .3);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 20px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.card-desc {
  color: var(--color-muted);
  font-size: 14px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 999px;
  background: var(--color-card);
  border: 1px solid rgba(192, 192, 200, .2);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--color-muted);
}

.tag--red {
  border-color: rgba(230, 57, 70, .5);
  color: #FFFFFF;
  background: rgba(230, 57, 70, .15);
}

.tag--blue {
  border-color: rgba(0, 180, 216, .5);
  color: #FFFFFF;
  background: rgba(0, 180, 216, .15);
}

.image-frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-card);
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(192, 192, 200, .2);
}

.image-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(230, 57, 70, .12), rgba(0, 180, 216, .08));
}

.image-frame::after {
  content: 'IMG';
  position: absolute;
  left: 12px;
  bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--color-muted);
  background: rgba(13, 13, 15, .75);
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(192, 192, 200, .2);
}

.image-frame--portrait {
  aspect-ratio: 3 / 4;
}

.image-frame--tall {
  aspect-ratio: 4 / 5;
}

.prose {
  max-width: 70ch;
  color: var(--color-muted);
  font-size: 16px;
  line-height: 1.8;
}

.prose h2,
.prose h3 {
  font-family: var(--font-heading);
  color: var(--color-text);
  margin-top: 1.6em;
  margin-bottom: .6em;
}

.prose h2 {
  font-size: 24px;
}

.prose h3 {
  font-size: 20px;
}

.prose a {
  color: var(--color-accent);
  border-bottom: 1px solid rgba(0, 180, 216, .4);
}

.prose ul {
  list-style: disc;
  padding-left: 1.4em;
  margin: 1em 0;
}

.prose ol {
  list-style: decimal;
  padding-left: 1.4em;
  margin: 1em 0;
}

.prose li {
  margin-bottom: .5em;
}

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

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

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

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

@media (max-width: 1024.98px) {
  .header-shell {
    flex-wrap: wrap;
    min-height: 60px;
    padding: 8px 16px;
    row-gap: 8px;
  }

  .brand {
    margin-right: auto;
  }

  .header-status {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    order: 2;
  }

  .header-cta {
    order: 3;
    margin-left: 0;
  }

  .site-nav {
    order: 4;
    width: 100%;
    margin-left: 0;
    display: none;
  }

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

  .site-nav .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 4px 4px;
  }

  .site-nav .nav-item + .nav-item .nav-link {
    border-top: 1px solid rgba(192, 192, 200, .08);
  }

  .site-nav .nav-link {
    width: 100%;
    justify-content: space-between;
    border-radius: 12px;
    padding: 12px 10px;
    white-space: normal;
  }

  .site-nav .nav-link::after {
    bottom: 50%;
    transform: translateY(50%);
    right: 14px;
    left: auto;
  }

  .site-nav .nav-link[aria-current="page"]::after {
    right: 14px;
  }

  .footer-shell {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 20px 24px;
  }

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px 20px;
  }

  .footer-trust {
    text-align: left;
  }
}

@media (max-width: 640.98px) {
  .brand-sub {
    display: none;
  }

  .header-cta {
    padding: 8px 12px;
    font-size: 13px;
  }

  .header-cta-bracket {
    display: none;
  }

  .nav-toggle-label {
    display: none;
  }

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

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 56px 0;
  }
}

@media (min-width: 1025px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    display: block;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}