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

body,
h1,
h2,
h3,
h4,
p,
ul,
ol,
figure {
  margin: 0;
  padding: 0;
}

ul,
ol {
  list-style: none;
}

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

a {
  color: inherit;
  text-decoration: none;
}

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

:root {
  --color-deep-graphite: #0D0F14;
  --color-panel-dark: #15181F;
  --color-card-surface: #1F242E;
  --color-graphite-line: #3A4350;
  --color-text-bright: #F5F7FA;
  --color-text-muted: #A0AAB5;
  --color-signal-orange: #FF4D00;
  --color-electric-blue: #00A3FF;
  --color-danger-red: #FF3B30;
  --color-success-green: #00C853;
  --font-heading: "PingFang SC", "Microsoft YaHei", Inter, sans-serif;
  --font-body: "Noto Sans SC", Arial, sans-serif;
  --font-data: "Roboto Mono", "Space Mono", monospace;
  --container-max: 1280px;
  --gutter: 24px;
  --border-line: 1px solid var(--color-graphite-line);
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--color-deep-graphite);
  color: var(--color-text-bright);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.2;
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-electric-blue);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 1000;
  padding: 12px 20px;
  background: var(--color-signal-orange);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
}

.skip-link:focus {
  left: 0;
}

/* ==== Header ==== */
.site-header {
  position: relative;
  z-index: 100;
  background: var(--color-deep-graphite);
  border-bottom: var(--border-line);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 140px;
  height: 4px;
  background: var(--color-signal-orange);
  z-index: 2;
  clip-path: polygon(0 0, 100% 0, 85% 100%, 0 100%);
}

.site-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(58, 67, 80, 0.5);
}

.site-header__brand {
  display: flex;
  align-items: center;
}

.site-header__brand-link {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 0.03em;
  color: var(--color-text-bright);
}

.site-header__brand-link::before {
  content: "";
  width: 12px;
  height: 12px;
  margin-right: 10px;
  background: var(--color-signal-orange);
  transform: skewX(-15deg);
  flex-shrink: 0;
}

.site-header__live {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background: rgba(255, 77, 0, 0.08);
  padding: 6px 10px;
  border-left: 2px solid var(--color-signal-orange);
}

.live-dot {
  width: 8px;
  height: 8px;
  background: var(--color-success-green);
  animation: live-pulse 2s infinite;
}

@keyframes live-pulse {
  0% { opacity: 1; }
  50% { opacity: 0.3; }
  100% { opacity: 1; }
}

.live-text {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: inherit;
}

.site-header__nav-wrap {
  background: var(--color-panel-dark);
  border-bottom: var(--border-line);
}

.site-nav__list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.site-nav__item {
  margin: 0;
}

.site-nav__link {
  display: block;
  padding: 16px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  border-bottom: 3px solid transparent;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-text-bright);
  background: rgba(0, 163, 255, 0.05);
}

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

.site-header__progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--color-signal-orange), var(--color-electric-blue));
  z-index: 10;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  background: var(--color-panel-dark);
  border: 1px solid var(--color-graphite-line);
}

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-toggle__line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-bright);
  transition: transform 0.2s, opacity 0.2s;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(6px) 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(-6px) rotate(-45deg);
}

/* ==== Footer ==== */
.site-footer {
  background: var(--color-panel-dark);
  border-top: var(--border-line);
  margin-top: 80px;
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1.5fr;
  gap: 40px;
  padding-top: 64px;
  padding-bottom: 48px;
}

.site-footer__brand-link {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 800;
  color: var(--color-text-bright);
  margin-bottom: 16px;
}

.site-footer__brand-link::before {
  content: "";
  width: 10px;
  height: 10px;
  margin-right: 8px;
  background: var(--color-signal-orange);
  transform: skewX(-15deg);
}

.site-footer__tagline {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: 16px;
}

.site-footer__note {
  color: var(--color-text-muted);
  font-size: 13px;
  line-height: 1.8;
  max-width: 36em;
}

.site-footer__nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.site-footer__col {
  min-width: 0;
}

.site-footer__heading {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-bright);
  border-left: 3px solid var(--color-signal-orange);
  padding-left: 10px;
  margin-bottom: 16px;
}

.site-footer__list li {
  margin-bottom: 10px;
  font-size: 14px;
  color: var(--color-text-muted);
}

.site-footer__link {
  color: var(--color-text-muted);
  transition: color 0.2s;
}

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

.site-footer__text {
  color: var(--color-text-muted);
  word-break: break-all;
}

.site-footer__contact .site-footer__list {
  color: var(--color-text-muted);
  font-size: 14px;
}

.site-footer__bottom {
  background: var(--color-deep-graphite);
  border-top: var(--border-line);
  padding: 20px 0;
}

.site-footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.site-footer__bottom-inner .site-footer__link {
  color: var(--color-text-muted);
}

.site-footer__bottom-inner .site-footer__link:hover,
.site-footer__bottom-inner .site-footer__link:focus-visible {
  color: var(--color-text-bright);
}

/* ==== Base components ==== */
.button {
  display: inline-block;
  padding: 12px 24px;
  border: 1px solid var(--color-graphite-line);
  background: transparent;
  color: var(--color-text-bright);
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  text-align: center;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.button:hover,
.button:focus-visible {
  border-color: var(--color-signal-orange);
}

.button--primary {
  background: var(--color-signal-orange);
  border-color: var(--color-signal-orange);
  color: #fff;
}

.button--primary:hover,
.button--primary:focus-visible {
  background: var(--color-electric-blue);
  border-color: var(--color-electric-blue);
}

.button--outline {
  border-color: var(--color-electric-blue);
  color: var(--color-electric-blue);
}

.button--outline:hover,
.button--outline:focus-visible {
  background: rgba(0, 163, 255, 0.1);
}

.card {
  background: var(--color-card-surface);
  border: var(--border-line);
  padding: 24px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.card--highlight {
  border-top: 3px solid var(--color-signal-orange);
}

.section {
  padding: 64px 0;
}

.section--dark {
  background: var(--color-panel-dark);
}

.section__label {
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--color-signal-orange);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section__title {
  font-size: 32px;
  margin-bottom: 24px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

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

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

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-muted);
  padding: 16px 0;
}

.breadcrumb__link {
  color: var(--color-text-muted);
  transition: color 0.2s;
}

.breadcrumb__link:hover,
.breadcrumb__link:focus-visible {
  color: var(--color-text-bright);
}

.breadcrumb__separator {
  color: var(--color-graphite-line);
}

.page-hero {
  padding: 64px 0 32px;
  border-bottom: var(--border-line);
}

.page-hero__title {
  font-size: 44px;
  line-height: 1.1;
}

.page-hero__lead {
  font-size: 18px;
  color: var(--color-text-muted);
  max-width: 40em;
  margin-top: 12px;
}

.image-frame {
  position: relative;
  background: linear-gradient(135deg, var(--color-panel-dark), var(--color-card-surface));
  border: var(--border-line);
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    45deg,
    transparent,
    transparent 10px,
    rgba(255, 255, 255, 0.02) 10px,
    rgba(255, 255, 255, 0.02) 20px
  );
}

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

.image-frame--wide {
  aspect-ratio: 21 / 9;
}

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

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

/* ==== Responsive ==== */
@media (max-width: 768px) {
  .site-header__top {
    padding-top: 12px;
    padding-bottom: 12px;
  }

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

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
  }

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

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__item {
    border-bottom: var(--border-line);
  }

  .site-nav__link {
    padding: 14px 16px;
    border-left: 3px solid transparent;
    border-bottom: none;
  }

  .site-nav__link[aria-current="page"] {
    border-left-color: var(--color-signal-orange);
    background: rgba(255, 77, 0, 0.04);
  }

  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 48px;
    padding-bottom: 32px;
  }

  .site-footer__nav {
    grid-template-columns: 1fr 1fr;
  }

  .site-footer__bottom-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

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

  .page-hero__title {
    font-size: 32px;
  }

  .section__title {
    font-size: 26px;
  }
}

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

  .live-dot {
    animation: none;
  }

  .card {
    transition: none;
  }

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

  html {
    scroll-behavior: auto;
  }
}