/* ========== 1. Reset & Base ========== */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: "Inter", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-white);
  background: var(--color-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.35s ease, transform 0.35s ease;
}
html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}
img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
p, h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
button { background: none; border: none; cursor: pointer; }
strong { font-weight: 600; }

/* ========== 2. Design Tokens ========== */
:root {
  --color-primary: #0A1F44;
  --color-accent: #FF6B35;
  --color-neon: #39FF14;
  --color-silver: #C0C0C0;
  --color-white: #FFFFFF;
  --color-mist: #A8B5D0;
  --color-charcoal: #131313;
  --color-ice: #66D9FF;
  --gradient-page: linear-gradient(135deg, #0A1F44 0%, #131313 100%);

  --font-heading: "Oswald", "Arial Narrow", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "Roboto Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;

  --size-h1: clamp(2.8rem, 7vw, 5.5rem);
  --size-h2: clamp(1.8rem, 4vw, 3rem);
  --size-h3: clamp(1.2rem, 2.5vw, 1.8rem);
  --size-data: clamp(2rem, 5vw, 4rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4rem;
  --space-8: 6rem;

  --container-w: 1280px;
  --border-thick: 4px;
  --border-med: 2px;
  --border-thin: 1px;
  --shadow-hard: 6px 6px 0 rgba(0, 0, 0, 0.35);
  --shadow-card: 4px 4px 0 rgba(0, 0, 0, 0.2);
  --radius: 0;

  --header-h: 104px;
}

@media (max-width: 900px) {
  :root {
    --header-h: 88px;
  }
}

/* ========== 3. Typography ========== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-white);
  text-transform: uppercase;
}
h1 { font-size: var(--size-h1); }
h2 { font-size: var(--size-h2); margin-bottom: var(--space-4); }
h3 { font-size: var(--size-h3); margin-bottom: var(--space-3); }
p { margin-bottom: var(--space-3); }
a { color: var(--color-ice); transition: color 0.2s ease; }
a:hover { color: var(--color-accent); }

[data-font-data] {
  font-family: var(--font-data);
}

/* ========== 4. Layout Primitives ========== */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
.container--narrow {
  max-width: 860px;
}
.section {
  padding-block: var(--space-7);
}
.section--tight {
  padding-block: var(--space-5);
}
.section--loose {
  padding-block: var(--space-8);
}
.grid {
  display: grid;
  gap: var(--space-5);
}
.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
}

#main-content {
  scroll-margin-top: calc(var(--header-h) + var(--space-4));
  outline: none;
}

/* ========== 5. Interactive Elements ========== */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}
.skip-link {
  position: absolute;
  top: -200px;
  left: var(--space-3);
  z-index: 1000;
  background: var(--color-accent);
  color: var(--color-white);
  font-weight: 600;
  padding: var(--space-2) var(--space-4);
  box-shadow: var(--shadow-hard);
  transition: top 0.2s ease;
}
.skip-link:focus-visible {
  top: var(--space-2);
}

.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.2;
  padding: 0.8rem 1.6rem;
  border: 3px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
}
.btn:focus-visible {
  outline: 3px solid var(--color-neon);
  outline-offset: 2px;
}
.btn--primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.3);
}
.btn--primary:hover {
  background: #e25927;
  transform: translate(1px, 1px);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.3);
}
.btn--ghost {
  background: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}
.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-white);
}

/* ========== 6. Breadcrumb ========== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
  padding: var(--space-3) 0;
  list-style: none;
  font-size: 0.85rem;
}
.breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.breadcrumb__item:not(:last-child)::after {
  content: "/";
  margin-inline: 0.25rem;
  color: var(--color-mist);
}
.breadcrumb__link {
  color: var(--color-ice);
}
.breadcrumb__link:hover {
  color: var(--color-accent);
}
.breadcrumb__current {
  color: var(--color-mist);
}

/* ========== 7. Cards ========== */
.card {
  background: rgba(255, 255, 255, 0.04);
  border: 2px solid var(--color-silver);
  box-shadow: var(--shadow-card);
  padding: var(--space-5);
}
.card--accent {
  border-left: 5px solid var(--color-accent);
}
.card--data {
  border: 3px solid var(--color-primary);
  background: var(--color-white);
  color: var(--color-primary);
  box-shadow: var(--shadow-hard);
}
.card--data h2,
.card--data h3,
.card--data .card__title {
  color: var(--color-primary);
}

/* ========== 8. Page Head ========== */
.page-head {
  padding-block: var(--space-7) var(--space-5);
  border-bottom: 4px solid var(--color-accent);
  margin-bottom: var(--space-6);
}
.page-head__title {
  font-size: var(--size-h1);
  margin-bottom: var(--space-3);
}
.page-head__lead {
  font-size: 1.1rem;
  color: var(--color-mist);
  max-width: 60ch;
}

/* ========== 9. Media Containers ========== */
.media {
  position: relative;
  overflow: hidden;
  background: var(--color-charcoal);
  border: 3px solid var(--color-primary);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.2);
}
.media--ratio-16x9 { aspect-ratio: 16 / 9; }
.media--ratio-4x3 { aspect-ratio: 4 / 3; }
.media--ratio-1x1 { aspect-ratio: 1 / 1; }
.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.media:hover img {
  transform: scale(1.03);
}

/* ========== 10. Stat Strip ========== */
.stat-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  background: var(--color-silver);
  border: 3px solid var(--color-silver);
  box-shadow: var(--shadow-card);
}
.stat-strip__item {
  flex: 1 1 140px;
  background: var(--color-white);
  padding: var(--space-4);
}
.stat-strip__value {
  font-family: var(--font-data);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
}
.stat-strip__value--accent {
  color: var(--color-accent);
}
.stat-strip__label {
  margin-top: var(--space-2);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  opacity: 0.7;
}

/* ========== 11. Header ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-primary);
  border-bottom: var(--border-thick) solid var(--color-accent);
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.2);
}
.site-header__progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.06);
  overflow: hidden;
  z-index: 5;
  pointer-events: none;
}
.site-header__progress span {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-neon), #7fff6b);
  transition: width 0.1s linear;
}
.site-header__databar {
  background: var(--color-charcoal);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  overflow: hidden;
  white-space: nowrap;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--color-silver);
}
.site-header__databar-track {
  display: inline-block;
  padding-block: 0.4rem;
  animation: databar-slide 32s linear infinite;
  will-change: transform;
}
.site-header__databar-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-inline: 0.35rem;
  vertical-align: middle;
}
.site-header__databar-item strong {
  color: var(--color-neon);
  font-weight: 700;
}
.site-header__databar-sep {
  margin-inline: 0.2rem;
  color: rgba(255, 255, 255, 0.25);
}
.site-header__databar-live {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-neon);
  animation: live-pulse 1.6s ease-in-out infinite;
}
@keyframes databar-slide {
  0% { transform: translateX(100vw); }
  100% { transform: translateX(-100%); }
}
@keyframes live-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(57, 255, 20, 0.6); }
  50% { opacity: 0.4; box-shadow: 0 0 12px 2px rgba(57, 255, 20, 0.3); }
}

.site-header__main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  position: relative;
  min-height: 68px;
}
.site-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-block: var(--space-3);
  color: var(--color-white);
}
.site-header__brand:hover {
  color: var(--color-white);
}
.site-header__mark {
  position: relative;
  width: 38px;
  height: 38px;
  background: var(--color-accent);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.35);
  flex-shrink: 0;
}
.site-header__mark::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  border-style: solid;
  border-width: 0 15px 15px 0;
  border-color: transparent var(--color-neon) transparent transparent;
}
.site-header__mark::after {
  content: "";
  position: absolute;
  bottom: 5px;
  left: 5px;
  width: 7px;
  height: 7px;
  background: var(--color-white);
  opacity: 0.9;
}
.site-header__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}
.site-header__brand-name {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-white);
}
.site-header__brand-slogan {
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.site-header__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 46px;
  height: 46px;
  padding: 0;
  background: var(--color-primary);
  border: 2px solid var(--color-silver);
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.3);
}
.site-header__toggle:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}
.site-header__toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(2) {
  opacity: 0;
}
.site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header__nav {
  margin-left: auto;
}
.site-header__nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.site-header__nav-link {
  display: block;
  position: relative;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-white);
  padding: var(--space-2) var(--space-3);
  letter-spacing: 0.02em;
  transition: color 0.2s ease;
}
.site-header__nav-link::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: var(--space-3);
  right: var(--space-3);
  height: 3px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
.site-header__nav-link:hover,
.site-header__nav-link:focus-visible {
  color: var(--color-white);
}
.site-header__nav-link:hover::after,
.site-header__nav-link:focus-visible::after {
  transform: scaleX(1);
}
.site-header__nav-link[aria-current="page"] {
  color: var(--color-accent);
  font-weight: 600;
}
.site-header__nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

/* ========== 12. Header Mobile ========== */
@media (max-width: 900px) {
  .site-header__main {
    min-height: 60px;
  }
  .site-header__toggle {
    display: flex;
  }
  .site-header__nav {
    display: none;
    flex-basis: 100%;
    order: 3;
    width: 100%;
    background: var(--color-primary);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
  }
  .site-header__nav[data-open] {
    display: block;
    animation: nav-drop 0.25s ease;
  }
  .site-header__nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: 0.5rem;
  }
  .site-header__nav-item {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }
  .site-header__nav-item:last-child {
    border-bottom: none;
  }
  .site-header__nav-link {
    padding: 0.85rem var(--space-4);
    font-size: 1rem;
  }
  .site-header__nav-link::after {
    display: none;
  }
  .site-header__nav-link[aria-current="page"] {
    border-left: 4px solid var(--color-accent);
    background: rgba(255, 107, 53, 0.08);
  }
}
@keyframes nav-drop {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ========== 13. Footer ========== */
.site-footer {
  background: var(--color-primary);
  color: var(--color-white);
  margin-top: var(--space-7);
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}
.site-footer__accent {
  height: 6px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent) 68%, var(--color-neon) 68%, var(--color-neon) 100%);
}
.site-footer__body {
  position: relative;
  padding-block: var(--space-7) var(--space-4);
}
.site-footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.site-footer__logo {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-white);
  margin: 0;
  line-height: 1.1;
}
.site-footer__slogan {
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
  margin-top: var(--space-1);
  margin-bottom: var(--space-4);
}
.site-footer__trust {
  font-size: 0.9rem;
  color: var(--color-mist);
  max-width: 42ch;
  line-height: 1.7;
  margin-bottom: 0;
}
.site-footer__cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}
.site-footer__title {
  font-family: var(--font-heading);
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-white);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}
.site-footer__list {
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-footer__list li {
  margin-bottom: var(--space-2);
}
.site-footer__list a {
  color: var(--color-mist);
  font-size: 0.9rem;
  transition: color 0.2s ease, padding-left 0.2s ease;
}
.site-footer__list a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}
.site-footer__list--muted li {
  color: var(--color-mist);
  font-size: 0.9rem;
}
.site-footer__note {
  font-size: 0.78rem;
  color: var(--color-mist);
  opacity: 0.75;
  margin-top: var(--space-3);
  max-width: 30ch;
  line-height: 1.6;
  margin-bottom: 0;
}
.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-top: var(--space-4);
  font-size: 0.8rem;
  color: var(--color-mist);
}
.site-footer__copy,
.site-footer__icp {
  margin: 0;
}
.site-footer__totop {
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-white);
  background: transparent;
  border: 2px solid var(--color-accent);
  padding: 0.4rem 1rem;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}
.site-footer__totop:hover,
.site-footer__totop:focus-visible {
  background: var(--color-accent);
  color: var(--color-white);
}
.site-footer__totop span {
  margin-left: 0.4rem;
  font-size: 1rem;
}

@media (min-width: 640px) {
  .site-footer__cols {
    grid-template-columns: repeat(2, 1fr);
  }
  .site-footer__col--contact {
    grid-column: span 2;
  }
}
@media (min-width: 900px) {
  .site-footer__top {
    grid-template-columns: 1.1fr 2fr;
    gap: var(--space-7);
  }
  .site-footer__cols {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
  }
  .site-footer__col--contact {
    grid-column: auto;
  }
}

/* ========== 14. Utility ========== */
.text-center { text-align: center; }
.text-accent { color: var(--color-accent); }
.text-neon { color: var(--color-neon); }
.text-mist { color: var(--color-mist); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-4 { margin-top: var(--space-4); }
.mb-4 { margin-bottom: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mb-6 { margin-bottom: var(--space-6); }
[hidden] { display: none !important; }

/* ========== 15. Reduced Motion ========== */
@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;
  }
  .site-header__databar-track {
    animation: none;
    transform: none;
  }
  html.js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .skip-link {
    transition: none;
  }
}

/* ========== 16. Print ========== */
@media print {
  .site-header,
  .site-footer,
  .site-footer__accent {
    display: none !important;
  }
  body {
    background: #ffffff;
    color: #131313;
  }
}