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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

ul,
ol {
  list-style: none;
}

a {
  color: var(--color-accent-alt);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

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

:root {
  --color-bg: #0A0E17;
  --color-bg-panel: #111826;
  --color-bg-deep: #1A2233;
  --color-text: #FFFFFF;
  --color-text-dim: #8A94A6;
  --color-accent: #C8FF00;
  --color-accent-alt: #00E5FF;
  --color-line: #2A3444;
  --color-overlay: rgba(200, 255, 0, 0.08);
  --color-danger: #FF3B3B;
  --font-headline: 'Arial Black', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-data: 'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;
  --font-headline-size: clamp(2.25rem, 6vw, 4.5rem);
  --font-headline-size-md: clamp(2.5rem, 8vw, 6rem);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;
  --container-width: 1280px;
  --header-height: 72px;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-4);
  }
}

@media (min-width: 1200px) {
  .container {
    padding-inline: var(--space-5);
  }
}

.site-main {
  min-height: 70vh;
}

.site-section {
  padding-block: clamp(var(--space-5), 8vw, var(--space-6));
}

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

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

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

.mono {
  font-family: var(--font-data);
  font-weight: 500;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.875rem;
  line-height: 1;
  padding: 0.95em 1.6em;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: background 0.25s ease, color 0.25s ease, transform 0.15s ease;
  cursor: pointer;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: #0A0E17;
  border-radius: 0;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: #dfff3d;
  color: #0A0E17;
  transform: translateY(-1px);
}

.heading-xl {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: var(--font-headline-size);
  line-height: 1.08;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

@media (min-width: 768px) {
  .heading-xl {
    font-size: var(--font-headline-size-md);
  }
}

.heading-lg {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: clamp(1.25rem, 2.5vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.lede {
  font-size: 1.125rem;
  color: var(--color-text-dim);
  max-width: 60ch;
}

.panel {
  background: var(--color-bg-panel);
  border: 1px solid var(--color-line);
  padding: var(--space-4);
  position: relative;
}

.panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--color-accent);
}

.tag {
  display: inline-flex;
  align-items: center;
  background: var(--color-bg-deep);
  border: 1px solid var(--color-line);
  color: var(--color-text-dim);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  text-transform: uppercase;
}

.tag--accent {
  background: var(--color-accent);
  border-color: transparent;
  color: #0A0E17;
}

.tag--line {
  background: transparent;
  border-color: var(--color-accent-alt);
  color: var(--color-accent-alt);
}

.grid {
  display: grid;
  gap: var(--space-4);
}

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

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

@media (max-width: 900px) {
  .grid--columns-2,
  .grid--columns-3 {
    grid-template-columns: minmax(0, 1fr);
  }
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
  font-size: 0.75rem;
  font-family: var(--font-data);
  color: var(--color-text-dim);
  padding: var(--space-3) 0 0;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.5em;
  color: var(--color-line);
}

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

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--color-accent);
}

.timeline {
  position: relative;
  padding-left: var(--space-4);
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-line);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--space-4);
}

.timeline__marker {
  position: absolute;
  left: calc(-1 * var(--space-4) + 1px);
  top: 6px;
  width: 10px;
  height: 10px;
  background: var(--color-accent-alt);
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--color-bg);
}

.img-frame {
  position: relative;
  overflow: hidden;
  display: block;
  background: var(--color-bg-deep);
  border: 1px solid var(--color-line);
}

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

.img-frame--ratio-3x4 {
  aspect-ratio: 3 / 4;
}

.img-frame--ratio-1x1 {
  aspect-ratio: 1 / 1;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.site-skip-link {
  position: fixed;
  top: -100%;
  left: var(--space-3);
  z-index: 200;
  padding: 12px 20px;
  background: var(--color-accent);
  color: #0A0E17;
  font-weight: 700;
  text-decoration: none;
  transition: top 0.2s ease;
}

.site-skip-link:focus-visible {
  top: var(--space-2);
}

.site-header {
  position: relative;
  z-index: 100;
  background: rgba(10, 14, 23, 0.92);
  backdrop-filter: blur(8px);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-alt));
  z-index: 1;
}

.site-header__bar {
  border-bottom: 1px solid var(--color-line);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.is-scrolled .site-header__bar {
  background: rgba(10, 14, 23, 0.98);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
}

.site-header__inner {
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.site-brand {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  color: var(--color-text);
  flex-shrink: 0;
}

.site-brand__mark {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.65rem;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--color-accent);
}

.site-brand__name {
  font-family: var(--font-headline);
  font-weight: 900;
  font-size: 1.65rem;
  line-height: 1;
  color: var(--color-text);
}

.site-brand__tag {
  margin-left: var(--space-2);
  font-size: 0.7rem;
  color: var(--color-text-dim);
  letter-spacing: 0.18em;
  border-left: 2px solid var(--color-accent-alt);
  padding-left: var(--space-2);
  display: none;
}

@media (min-width: 768px) {
  .site-brand__tag {
    display: inline;
  }
}

.site-nav {
  order: 3;
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  counter-reset: navIndex;
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 18px 14px;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-text-dim);
  letter-spacing: 0.04em;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-nav__link::before {
  content: "/ " counter(navIndex, decimal-leading-zero);
  counter-increment: navIndex;
  font-family: var(--font-data);
  font-size: 0.7em;
  margin-right: 4px;
  color: var(--color-accent-alt);
  opacity: 0.7;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-text);
}

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

.site-header__cta {
  order: 4;
  flex-shrink: 0;
}

.site-header__toggle {
  order: 5;
  width: 44px;
  height: 44px;
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 10px;
  border: 1px solid var(--color-line);
  border-radius: 2px;
  transition: border-color 0.2s ease;
}

.site-header__toggle:hover,
.site-header__toggle:focus-visible {
  border-color: var(--color-accent);
}

.site-header__toggle-bar {
  height: 2px;
  background: var(--color-text-dim);
  display: block;
  transition: transform 0.25s ease, opacity 0.25s ease, background 0.25s ease;
}

.site-header__toggle:hover .site-header__toggle-bar {
  background: var(--color-accent);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(2) {
  opacity: 0;
}

.site-header__toggle[aria-expanded="true"] .site-header__toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0%;
  background: var(--color-accent);
  z-index: 101;
  pointer-events: none;
}

.site-footer {
  background: var(--color-bg-deep);
  border-top: 1px solid var(--color-line);
  padding-top: var(--space-5);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
}

@media (min-width: 768px) {
  .site-footer__inner {
    grid-template-columns: 2fr 1fr 1.2fr;
    gap: var(--space-5);
  }
}

.site-footer__brand {
  display: block;
}

.site-footer__brand .site-brand__mark {
  font-size: 2.2rem;
}

.site-footer__brand .site-brand__name {
  font-size: 2.2rem;
}

.site-footer__tagline {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-dim);
  margin-top: var(--space-2);
}

.site-footer__note {
  color: var(--color-text-dim);
  font-size: 0.875rem;
  margin-top: var(--space-2);
  max-width: 40ch;
  line-height: 1.7;
}

.site-footer__heading {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.site-footer__list li {
  padding: 4px 0;
  color: var(--color-text-dim);
  font-size: 0.875rem;
}

.site-footer__list a {
  color: var(--color-text-dim);
  transition: color 0.2s ease;
}

.site-footer__list a:hover,
.site-footer__list a:focus-visible {
  color: var(--color-accent);
}

.site-footer__bottom {
  border-top: 1px solid var(--color-line);
  border-bottom: 3px solid var(--color-accent);
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--color-text-dim);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

.site-footer__copyright,
.site-footer__icp {
  white-space: nowrap;
}

.site-footer__trust {
  width: 100%;
  font-size: 0.72rem;
  color: var(--color-text-dim);
  opacity: 0.85;
}

@media (max-width: 767px) {
  .site-header__inner {
    min-height: 60px;
    gap: var(--space-2);
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg-panel);
    border-bottom: 1px solid var(--color-line);
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    margin-left: 0;
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.4);
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-2) 0;
  }

  .site-nav__link {
    display: flex;
    align-items: center;
    padding: 14px var(--space-4);
    font-size: 1rem;
    border-bottom: 1px solid var(--color-line);
    border-left: 3px solid transparent;
  }

  .site-nav__link::before {
    content: "/ " counter(navIndex, decimal-leading-zero);
    font-size: 0.7em;
  }

  .site-nav__link:hover,
  .site-nav__link:focus-visible {
    background: var(--color-overlay);
  }

  .site-nav__link[aria-current="page"] {
    border-bottom-color: var(--color-line);
    border-left-color: var(--color-accent);
    background: rgba(200, 255, 0, 0.06);
  }

  .site-header__cta {
    display: none;
  }

  .site-header__toggle {
    display: flex;
  }
}

@media (min-width: 768px) and (max-width: 1024px) {
  .site-header__inner {
    gap: var(--space-2);
  }

  .site-nav__link {
    padding: 18px 10px;
    font-size: 0.8rem;
  }

  .site-nav__link::before {
    margin-right: 2px;
  }

  .site-brand__mark,
  .site-brand__name {
    font-size: 1.4rem;
  }

  .site-brand__tag {
    display: none;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

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