:root {
  --color-primary-bg: #0A1128;
  --color-secondary-bg: #101B3D;
  --color-elevated-bg: #16214A;
  --color-accent-cyan: #00E5FF;
  --color-accent-purple: #7B2FFF;
  --color-accent-green: #39FF14;
  --color-accent-orange: #FF6B00;
  --color-text-primary: #E6F1FF;
  --color-text-secondary: #9AA8C7;
  --color-text-inverse: #0A1128;
  --color-border-subtle: #233057;
  --color-border-strong: #3A4C7A;
  --font-heading: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "Roboto Mono", "SFMono-Regular", "Cascadia Code", monospace;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;
  --container-width: 1280px;
  --header-height: 72px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --transition-fast: 0.2s ease-out;
  --transition-base: 0.3s ease-out;
  --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-float: 0 4px 20px rgba(0, 229, 255, 0.18);
  --focus-ring: 0 0 0 3px rgba(0, 229, 255, 0.65);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.75;
  color: var(--color-text-primary);
  background-color: var(--color-primary-bg);
  background-image:
    radial-gradient(ellipse at 85% 10%, rgba(123, 47, 255, 0.12), transparent 50%),
    radial-gradient(ellipse at 15% 90%, rgba(0, 229, 255, 0.08), transparent 45%),
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 44px 44px, 44px 44px;
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent-cyan);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

a:hover {
  color: var(--color-text-primary);
  opacity: 0.85;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul[class],
ol[class] {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.2;
  color: var(--color-text-primary);
}

p {
  margin-bottom: 1em;
}

:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
  border-radius: var(--radius-sm);
}

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

.l-container {
  width: min(100% - 48px, var(--container-width));
  margin-inline: auto;
}

.l-main {
  display: block;
  overflow: hidden;
}

.l-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - 48px, var(--container-width));
  margin-inline: auto;
  min-height: var(--header-height);
  position: relative;
}

.l-footer {
  width: min(100% - 48px, var(--container-width));
  margin-inline: auto;
}

.c-skip {
  position: fixed;
  top: -100px;
  left: var(--space-4);
  z-index: 3000;
  background: var(--color-accent-green);
  color: var(--color-text-inverse);
  font-family: var(--font-body);
  font-weight: 900;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  transition: top var(--transition-fast);
}

.c-skip:focus-visible {
  top: var(--space-2);
  box-shadow: var(--focus-ring);
}

.c-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 17, 40, 0.82);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid var(--color-border-subtle);
  margin-bottom: var(--space-7);
}

.c-brand__link {
  display: flex;
  flex-direction: column;
  gap: 0;
  line-height: 1;
  position: relative;
  z-index: 2;
}

.c-brand__link::before {
  content: "";
  position: absolute;
  left: -52px;
  top: 50%;
  width: 42px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-green), var(--color-accent-cyan));
  clip-path: polygon(0 0, 100% 0, 100% 100%, 6px 100%);
  transform: translateY(-50%);
  opacity: 0.8;
}

.c-brand__cn {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  color: var(--color-text-primary);
}

.c-brand__en {
  font-family: var(--font-data);
  font-size: 0.65rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-accent-cyan);
  margin-top: 3px;
}

.c-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.c-nav__link {
  display: inline-block;
  padding: var(--space-2) var(--space-3);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.c-nav__link:hover {
  color: var(--color-accent-cyan);
  background: rgba(0, 229, 255, 0.06);
  opacity: 1;
}

.c-nav__link[aria-current="page"] {
  color: var(--color-accent-green);
  border-bottom-color: var(--color-accent-green);
}

.c-nav-toggle {
  display: none;
  flex-direction: column;
  align-items: flex-end;
  gap: 5px;
  padding: var(--space-2) var(--space-2);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  min-width: 48px;
  min-height: 48px;
  justify-content: center;
  background: rgba(22, 33, 74, 0.6);
}

.c-nav-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-accent-cyan);
  transition: transform var(--transition-fast), opacity var(--transition-fast), background var(--transition-fast);
}

.c-nav-toggle__text {
  font-family: var(--font-data);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.c-nav-toggle[aria-expanded="true"] .c-nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--color-accent-green);
}

.c-nav-toggle[aria-expanded="true"] .c-nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.c-nav-toggle[aria-expanded="true"] .c-nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--color-accent-green);
}

.c-progress {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 3px;
  background: transparent;
  pointer-events: none;
}

.c-progress__bar {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent-green), var(--color-accent-cyan), var(--color-accent-purple));
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.45);
}

.c-footer {
  background-color: var(--color-secondary-bg);
  border-top: 1px solid var(--color-border-strong);
  padding: var(--space-7) 0 var(--space-5);
  margin-top: var(--space-8);
  position: relative;
}

.c-footer::before {
  content: "";
  display: block;
  position: absolute;
  top: -1px;
  left: 0;
  width: 280px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-green), var(--color-accent-cyan), var(--color-accent-purple));
  clip-path: polygon(0 0, 100% 0, 92% 100%, 0 100%);
}

.c-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1.4fr 1fr;
  gap: var(--space-5);
}

.c-footer-brand__name {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 2rem;
  line-height: 1.2;
  letter-spacing: 0.03em;
  margin-bottom: var(--space-2);
  background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-accent-cyan) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.c-footer-brand__tagline {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  max-width: 320px;
  border-left: 3px solid var(--color-accent-purple);
  padding-left: var(--space-3);
  margin-top: var(--space-2);
}

.c-footer-col__title {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent-purple);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border-subtle);
}

.c-footer-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.c-footer-nav__link {
  font-size: 0.88rem;
  color: var(--color-text-primary);
  padding: var(--space-1) 0;
  opacity: 0.78;
  transition: opacity var(--transition-fast), padding-left var(--transition-fast), color var(--transition-fast);
}

.c-footer-nav__link:hover {
  opacity: 1;
  color: var(--color-accent-cyan);
  padding-left: var(--space-2);
  background: none;
}

.c-footer-contact {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.c-footer-contact__item {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-family: var(--font-data);
  letter-spacing: 0.01em;
  word-break: break-all;
}

.c-footer-contact__item a {
  color: var(--color-text-primary);
  text-decoration: underline;
  text-decoration-color: var(--color-border-strong);
  text-underline-offset: 3px;
}

.c-footer-contact__item a:hover {
  color: var(--color-accent-green);
}

.c-footer-compliance {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-5);
  align-items: center;
  font-family: var(--font-data);
  font-size: 0.78rem;
  color: var(--color-text-secondary);
}

.c-footer-compliance__icp {
  letter-spacing: 0.06em;
}

.c-footer-compliance__year {
  letter-spacing: 0.04em;
}

.c-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 900;
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  min-height: 44px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}

.c-btn--primary {
  background: var(--color-accent-green);
  color: var(--color-text-inverse);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 50%, calc(100% - 12px) 100%, 0 100%);
}

.c-btn--primary:hover {
  background: var(--color-accent-cyan);
  color: var(--color-text-inverse);
  transform: translateY(-2px);
  box-shadow: 0 4px 24px rgba(0, 229, 255, 0.35);
  opacity: 1;
}

.c-btn--ghost {
  background: transparent;
  color: var(--color-accent-cyan);
  border: 1px solid var(--color-border-strong);
  box-shadow: inset 0 0 0 1px transparent;
}

.c-btn--ghost:hover {
  border-color: var(--color-accent-cyan);
  color: var(--color-text-primary);
  box-shadow: var(--shadow-float);
  transform: translateY(-2px);
}

.c-section-label {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-accent-orange);
  border-left: 3px solid var(--color-accent-orange);
  padding-left: var(--space-2);
  margin-bottom: var(--space-3);
}

.c-card {
  background: var(--color-secondary-bg);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  padding: var(--space-5);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.c-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-strong);
  box-shadow: 0 12px 32px rgba(0, 229, 255, 0.12);
}

.c-card--accent {
  border-left: 4px solid var(--color-accent-cyan);
}

.c-card--highlight {
  border-color: var(--color-accent-green);
  background: linear-gradient(145deg, var(--color-elevated-bg), var(--color-secondary-bg));
}

.c-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
  border-bottom: 1px solid var(--color-border-subtle);
  padding-bottom: var(--space-3);
}

.c-breadcrumb a {
  color: var(--color-text-secondary);
}

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

.c-breadcrumb__sep {
  color: var(--color-accent-purple);
}

.c-prose {
  max-width: 780px;
  color: var(--color-text-primary);
  font-size: 0.98rem;
}

.c-prose h2 {
  font-size: 1.8rem;
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
  border-left: 4px solid var(--color-accent-cyan);
  padding-left: var(--space-3);
}

.c-prose h3 {
  font-size: 1.25rem;
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
  color: var(--color-text-primary);
}

.c-prose p {
  color: var(--color-text-primary);
  line-height: 1.85;
}

.c-prose ul,
.c-prose ol {
  padding-left: var(--space-5);
  margin-bottom: var(--space-4);
}

.c-prose li {
  margin-bottom: var(--space-1);
  color: var(--color-text-primary);
}

.c-prose li::marker {
  color: var(--color-accent-green);
}

.c-prose blockquote {
  border-left: 3px solid var(--color-accent-purple);
  padding-left: var(--space-4);
  margin: var(--space-4) 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

.c-prose strong {
  color: var(--color-text-primary);
  font-weight: 900;
}

.c-prose a {
  color: var(--color-accent-green);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(57, 255, 20, 0.4);
}

.c-prose code {
  font-family: var(--font-data);
  background: rgba(0, 229, 255, 0.08);
  border: 1px solid var(--color-border-subtle);
  border-radius: 3px;
  padding: 0.15em 0.5em;
  font-size: 0.85em;
  color: var(--color-accent-cyan);
}

.l-grid--bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-7);
}

.l-grid--split {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
}

.l-grid--thirds {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.l-grid--quarters {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.l-grid--side {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
  margin-bottom: var(--space-7);
}

:where([data-scroll-reveal]) {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s ease-out, transform 0.3s ease-out;
}

:where([data-scroll-reveal].is-visible) {
  opacity: 1;
  transform: none;
}

@media (max-width: 1080px) {
  .c-footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
  }

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

  .l-grid--side {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .c-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    z-index: 999;
    background: rgba(10, 17, 40, 0.97);
    border-top: 1px solid var(--color-border-subtle);
    border-bottom: 1px solid var(--color-border-strong);
    padding: var(--space-3) 24px var(--space-5);
    clip-path: inset(0 0 100% 0);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-18px);
    transition: clip-path 0.35s ease-out, visibility 0.35s, opacity 0.3s, transform 0.35s;
  }

  .c-nav[data-open] {
    clip-path: inset(0 0 0 0);
    visibility: visible;
    opacity: 1;
    transform: none;
  }

  .c-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
  }

  .c-nav__link {
    display: block;
    padding: var(--space-3) var(--space-4);
    font-size: 1rem;
    border-bottom: 1px solid var(--color-border-subtle);
    border-left: 3px solid transparent;
  }

  .c-nav__link[aria-current="page"] {
    border-left-color: var(--color-accent-green);
    background: rgba(57, 255, 20, 0.04);
  }

  .c-nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .l-grid--bento {
    grid-template-columns: repeat(6, 1fr);
    gap: var(--space-3);
  }

  .l-grid--split,
  .l-grid--thirds {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  :root {
    --space-8: 72px;
    --space-7: 48px;
    --space-6: 40px;
    --space-5: 28px;
    --space-4: 20px;
  }

  .l-header {
    width: calc(100% - 32px);
  }

  .l-footer {
    width: calc(100% - 32px);
  }

  .c-brand__cn {
    font-size: 1.1rem;
  }

  .c-brand__en {
    font-size: 0.55rem;
  }

  .c-brand__link::before {
    left: -38px;
    width: 30px;
  }

  .c-footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .c-footer-brand__name {
    font-size: 1.6rem;
    font-family: var(--font-body);
    font-weight: 900;
    font-family: var(--font-heading);
  }

  .c-footer-compliance {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    margin-top: var(--space-5);
    padding-top: var(--space-3);
  }

  .l-grid--bento {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .c-btn--primary,
  .c-btn--ghost {
    width: 100%;
    min-height: 48px;
  }

  .c-prose {
    font-size: 0.92rem;
  }

  .c-prose h2 {
    font-size: 1.4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  html {
    scroll-behavior: auto;
  }

  [data-scroll-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .c-nav {
    transition: none;
    transform: none;
  }
}