/* ===== CSS Reset & Variables ===== */
:root {
  --color-bg: #0A1426;
  --color-surface: #101E34;
  --color-accent: #D7FF00;
  --color-accent-orange: #FF7A00;
  --color-text: #F0F4F8;
  --color-text-dim: #A8B8C8;
  --color-data: #00C2FF;
  --color-amber: #FFC700;
  --color-glass: rgba(255, 255, 255, 0.06);
  --color-line: #1E3A5A;

  --font-heading: "Archivo", "Arial Black", sans-serif;
  --font-body: "Noto Sans SC", system-ui, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-number: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --base-size: 16px;
  --rail-width: 280px;
  --transition: 200ms ease;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--base-size);
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

ul,
ol {
  margin: 0;
  padding: 0;
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

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

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

/* ===== A11y utilities ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 9999;
  padding: 10px 20px;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 700;
  font-size: 14px;
  border-radius: 6px;
  text-decoration: none;
  transform: translateY(-300%);
  transition: transform var(--transition);
}
.skip-link:focus-visible {
  transform: translateY(0);
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.4;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  background: transparent;
  white-space: nowrap;
  transition: background-color var(--transition), color var(--transition),
    border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn--primary {
  background: var(--color-accent);
  color: var(--color-bg);
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--color-accent-orange);
  color: var(--color-text);
}
.btn--primary:active {
  transform: translateY(1px);
}
.btn--outline {
  border-color: var(--color-line);
  color: var(--color-text);
}
.btn--outline:hover,
.btn--outline:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(215, 255, 0, 0.06);
}
.btn--sm {
  padding: 8px 14px;
  font-size: 13px;
  border-radius: 4px;
}
.btn--block {
  display: flex;
  width: 100%;
}

/* ===== Brand ===== */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-text);
}
.site-brand__mark {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-number);
  font-weight: 500;
  font-size: 22px;
  line-height: 1;
  border-radius: 4px;
  flex-shrink: 0;
}
.site-brand__mark::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -4px;
  width: 12px;
  height: 12px;
  background: var(--color-accent-orange);
  border-radius: 2px;
  border: 2px solid var(--color-bg);
}
.site-brand__name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.1;
}
.site-brand__text {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.site-brand__tagline {
  font-size: 12px;
  color: var(--color-text-dim);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.site-brand--bar .site-brand__mark {
  width: 32px;
  height: 32px;
  font-size: 18px;
  border-radius: 4px;
}
.site-brand--bar .site-brand__mark::after {
  width: 10px;
  height: 10px;
}
.site-brand--bar .site-brand__name {
  font-size: 17px;
}

.site-brand--rail {
  padding: 24px 20px 20px;
  border-bottom: 1px solid var(--color-line);
  flex-shrink: 0;
}
.site-brand--rail .site-brand__mark {
  width: 44px;
  height: 44px;
  font-size: 24px;
}
.site-brand--rail .site-brand__name {
  font-size: 22px;
}

.site-brand--footer {
  gap: 10px;
}
.site-brand--footer .site-brand__mark {
  width: 36px;
  height: 36px;
  font-size: 20px;
}
.site-brand--footer .site-brand__name {
  font-size: 18px;
}

/* ===== Scroll progress ===== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1000;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-orange));
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

/* ===== Header ===== */
.site-header {
  position: relative;
  z-index: 800;
}

.site-header__bar {
  position: sticky;
  top: 0;
  z-index: 150;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  background: rgba(10, 20, 38, 0.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-line);
}
.site-header__bar .site-brand {
  margin-right: auto;
}

@media (min-width: 1024px) {
  .site-header__bar {
    display: none;
  }
}

/* ===== Mobile nav toggle ===== */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 6px;
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color var(--transition), border-color var(--transition);
}
.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--color-accent);
}
.nav-toggle__line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
  transition: transform 250ms var(--ease-out), opacity 150ms ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===== Side rail / drawer navigation ===== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 900;
  display: flex;
  flex-direction: column;
  width: var(--rail-width);
  max-width: 85vw;
  height: 100vh;
  height: 100dvh;
  background-color: var(--color-bg);
  background-image: radial-gradient(
      ellipse 90% 36% at 50% 0%,
      rgba(0, 194, 255, 0.08),
      transparent 70%
    ),
    linear-gradient(135deg, rgba(0, 194, 255, 0.02) 25%, transparent 25%),
    linear-gradient(225deg, rgba(0, 194, 255, 0.02) 25%, transparent 25%);
  background-size: auto, 32px 32px, 32px 32px;
  background-repeat: no-repeat, repeat, repeat;
  border-right: 1px solid var(--color-line);
  overflow-y: auto;
  overscroll-behavior: contain;
}
.site-nav:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--color-accent);
}

.site-nav__list {
  list-style: none;
  margin: 0;
  padding: 16px 0;
}

.site-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 20px;
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color var(--transition), background-color var(--transition);
}
.site-nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--color-accent);
  transition: width var(--transition);
}
.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.03);
}
.site-nav__link:hover::before,
.site-nav__link:focus-visible::before {
  width: 3px;
}
.site-nav__link[aria-current="page"] {
  color: var(--color-text);
}
.site-nav__link[aria-current="page"]::before {
  width: 3px;
  background: var(--color-accent);
}

.site-nav__index {
  font-family: var(--font-number);
  font-size: 12px;
  font-weight: 500;
  line-height: 1;
  color: var(--color-data);
  letter-spacing: 0.08em;
  min-width: 20px;
}
.site-nav__link[aria-current="page"] .site-nav__index {
  color: var(--color-accent);
}

.site-nav__label {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.site-nav__footer {
  margin-top: auto;
  padding: 20px;
  border-top: 1px solid var(--color-line);
  flex-shrink: 0;
}

.site-nav__data {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 16px 0 0;
  font-family: var(--font-number);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-text-dim);
}

.site-nav__pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  animation: nav-pulse 2s ease-in-out infinite;
}

@keyframes nav-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 0 rgba(215, 255, 0, 0.45);
  }
  50% {
    box-shadow: 0 0 0 6px rgba(215, 255, 0, 0);
  }
}

/* ===== Nav backdrop ===== */
.nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 890;
  background: rgba(4, 10, 20, 0.7);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 250ms ease, visibility 250ms ease;
}

/* ===== Mobile drawer states ===== */
@media (max-width: 1023px) {
  .site-nav {
    transform: translateX(-100%);
    transition: transform 250ms var(--ease-out);
    box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  }
  .site-nav[data-open] {
    transform: translateX(0);
    box-shadow: 20px 0 60px rgba(0, 0, 0, 0.55);
  }
  .site-nav[data-open] ~ .nav-backdrop {
    opacity: 1;
    visibility: visible;
  }
}

/* ===== Main content layout ===== */
#main-content {
  display: block;
  min-height: 70vh;
}
@media (min-width: 1024px) {
  #main-content {
    margin-left: var(--rail-width);
  }
}

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 40px);
}
.container--narrow {
  max-width: 760px;
}
.container--wide {
  max-width: none;
  padding-inline: clamp(20px, 4vw, 48px);
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  font-family: var(--font-number);
  font-size: 13px;
  color: var(--color-text-dim);
}
.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb li:not(:last-child)::after {
  content: "/";
  color: var(--color-line);
}
.breadcrumb a {
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color var(--transition);
}
.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--color-accent);
}
.breadcrumb [aria-current="page"] {
  color: var(--color-accent);
}

/* ===== Page hero ===== */
.page-hero {
  padding: clamp(40px, 8vw, 88px) 0;
}
.page-hero__eyebrow {
  font-family: var(--font-number);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--color-data);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.page-hero__title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin: 0 0 16px;
}
.page-hero__lead {
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.7;
  color: var(--color-text-dim);
  max-width: 600px;
}

/* ===== Section ===== */
.section {
  padding: clamp(40px, 6vw, 80px) 0;
}
.section-head {
  margin-bottom: 28px;
}
.section-head__row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 900;
  line-height: 1.2;
  color: var(--color-text);
  position: relative;
  padding-bottom: 14px;
}
.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 44px;
  height: 3px;
  background: var(--color-accent);
}
.section-subtitle {
  font-size: 14px;
  color: var(--color-text-dim);
  margin: 8px 0 0;
}

/* ===== Grid ===== */
.grid {
  display: grid;
  gap: 24px;
}
.grid--2 {
  grid-template-columns: repeat(2, 1fr);
}
.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}
.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}
@media (max-width: 767px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }
}
@media (min-width: 768px) and (max-width: 1023px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== Data display ===== */
.data-display {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-number);
  line-height: 1;
}
.data-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-dim);
}
.data-value {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 500;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.data-unit {
  font-size: 0.5em;
  color: var(--color-text-dim);
  margin-left: 2px;
}

/* ===== Badge ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
.badge--live {
  background: rgba(215, 255, 0, 0.12);
  color: var(--color-accent);
  border: 1px solid rgba(215, 255, 0, 0.3);
}
.badge--hot {
  background: rgba(255, 122, 0, 0.12);
  color: var(--color-accent-orange);
  border: 1px solid rgba(255, 122, 0, 0.3);
}

/* ===== Editorial components ===== */
.editorial-note {
  background: var(--color-glass);
  border-left: 3px solid var(--color-data);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-dim);
}
.editorial-index {
  counter-reset: edi;
  list-style: none;
  margin: 0;
  padding: 0;
}
.editorial-index li {
  counter-increment: edi;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-line);
  font-size: 14px;
}
.editorial-index li::before {
  content: counter(edi, decimal-leading-zero);
  font-family: var(--font-number);
  font-size: 12px;
  color: var(--color-accent);
  margin-right: 12px;
}

/* ===== Media / Image container ===== */
.media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 8px;
  overflow: hidden;
}
.media--tall {
  aspect-ratio: 4 / 5;
}
.media--wide {
  aspect-ratio: 21 / 9;
}
.media--square {
  aspect-ratio: 1 / 1;
}
.media::after {
  content: attr(data-caption);
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 28px 14px 10px;
  font-size: 12px;
  color: rgba(240, 244, 248, 0.85);
  background: linear-gradient(transparent, rgba(10, 20, 38, 0.85));
  opacity: 0;
  transition: opacity var(--transition);
}
.media:hover::after {
  opacity: 1;
}

/* ===== Footer ===== */
.site-footer {
  position: relative;
  z-index: 10;
  background: var(--color-surface);
  color: var(--color-text-dim);
  border-top: 1px solid var(--color-line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 100%;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0,
    transparent 14px,
    rgba(255, 255, 255, 0.012) 14px,
    rgba(255, 255, 255, 0.012) 15px
  );
  pointer-events: none;
}
@media (min-width: 1024px) {
  .site-footer {
    margin-left: var(--rail-width);
  }
}

.site-footer__speed {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent) 25%, var(--color-accent-orange) 65%, transparent);
}

.site-footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(32px, 5vw, 64px) clamp(16px, 3vw, 40px) 24px;
}

.site-footer__main {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}
.site-footer__columns {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 767px) {
  .site-footer__columns {
    grid-template-columns: 1fr;
  }
}
@media (min-width: 1200px) {
  .site-footer__main {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }
}

.site-footer__about {
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-dim);
  margin: 16px 0 0;
  max-width: 480px;
}
.site-footer__trust {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text-dim);
  opacity: 0.85;
  margin: 14px 0 0;
  max-width: 480px;
  border-left: 2px solid var(--color-accent);
  padding-left: 12px;
}

.site-footer__col {
  min-width: 0;
}
.site-footer__heading {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text);
  margin: 0 0 16px;
}
.site-footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
  line-height: 1.6;
  word-break: break-all;
}
.site-footer__links a {
  color: var(--color-text-dim);
  text-decoration: none;
  transition: color var(--transition);
}
.site-footer__links a:hover,
.site-footer__links a:focus-visible {
  color: var(--color-accent);
}
.site-footer__note {
  font-size: 12px;
  color: var(--color-text-dim);
  opacity: 0.75;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 8px 24px;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--color-line);
  font-family: var(--font-number);
  font-size: 12px;
  color: var(--color-text-dim);
}
.site-footer__bottom p {
  margin: 0;
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}