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

:root {
  --color-bg: #0A192F;
  --color-panel: #1A1A1A;
  --color-accent: #00FF9D;
  --color-orange: #FF6E30;
  --color-cyan: #00E5FF;
  --color-violet: #8A2BE2;
  --color-text: #E0E0E0;
  --color-muted: #8FA3C8;
  --color-line: #2A3B5C;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Mono", Consolas, monospace;
  --max-w: 1280px;
  --gutter: clamp(20px, 4vw, 48px);
  --header-h: 72px;
  --frame-w: clamp(3px, 0.4vw, 6px);
  --transition: 0.22s ease;
  --shadow: 6px 6px 0 rgba(0, 0, 0, 0.35);
}

html { scroll-behavior: smooth; }

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

main { display: block; }
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; color: #fff; }
p { margin-bottom: 1em; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--color-accent); }
img, svg, video { display: block; max-width: 100%; }
ul, ol { list-style: none; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }

body.is-nav-open { overflow: hidden; }
#main-content { scroll-margin-top: calc(var(--header-h) + 16px); outline: none; }

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

.container { width: min(100% - 2 * var(--gutter), var(--max-w)); margin-inline: auto; }

.section { padding-block: clamp(48px, 8vw, 96px); }
.section--band { background: linear-gradient(180deg, var(--color-bg) 0%, #0D1B3A 50%, var(--color-bg) 100%); border-block: 1px solid var(--color-line); }
.section--dark { background: var(--color-panel); }
.section--dark + .section--dark { border-top: 1px solid var(--color-line); }

.text { max-width: 72ch; }

.index { font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.16em; color: var(--color-cyan); text-transform: uppercase; }

.grid { display: grid; gap: clamp(20px, 3vw, 32px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--aside { grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); align-items: start; }

.skip-link {
  position: fixed;
  top: -80px;
  left: var(--gutter);
  z-index: 600;
  display: inline-block;
  padding: 10px 18px;
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid var(--color-accent);
  transition: top var(--transition), color var(--transition);
}
.skip-link:focus-visible { top: 12px; color: var(--color-bg); outline: none; }

.site-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 500;
  pointer-events: none;
}
.site-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-accent), var(--color-cyan));
  box-shadow: 0 0 10px rgba(0, 255, 157, 0.5);
  transition: width 0.1s linear;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 300;
  background: var(--color-bg);
  border-bottom: var(--frame-w) solid var(--color-line);
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(var(--frame-w) + 4px);
  height: 2px;
  background: var(--color-accent);
  opacity: 0.9;
  pointer-events: none;
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: min(100% - 2 * var(--gutter), var(--max-w));
  margin-inline: auto;
  min-height: var(--header-h);
}
.site-header__inner::before,
.site-header__inner::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 10px;
  height: 10px;
  transform: translateY(-50%);
  border: 0 solid var(--color-accent);
  opacity: 0.7;
  pointer-events: none;
}
.site-header__inner::before { left: -14px; border-width: 1px 0 0 1px; }
.site-header__inner::after { right: -14px; border-width: 1px 1px 0 0; }

.site-brand {
  position: relative;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: #fff;
}
.site-brand:hover { color: #fff; }
.site-brand__mark {
  display: inline-grid;
  place-items: center;
  padding: 7px 10px;
  background: var(--color-panel);
  border: 1px solid var(--color-accent);
  transform: skewX(-10deg);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  line-height: 1.1;
}
.site-brand__mark-inner { display: inline-block; transform: skewX(10deg); }
.site-brand__name { display: flex; flex-direction: column; line-height: 1.3; }
.site-brand__name strong { font-size: 17px; font-weight: 700; letter-spacing: 0.06em; color: #fff; }
.site-brand__name em { font-style: normal; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.22em; color: var(--color-cyan); }

.site-nav { display: flex; align-items: center; }
.site-nav__list { display: flex; align-items: center; gap: 2px; }
.site-nav__item { display: flex; }
.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 14px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-text);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}
.site-nav__link::before {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 8px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}
.site-nav__link:hover { background: rgba(0, 255, 157, 0.05); color: #fff; }
.site-nav__link:hover::before,
.site-nav__link[aria-current="page"]::before { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--color-accent); }
.site-nav__index {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--color-muted);
  transition: color var(--transition);
}
.site-nav__link:hover .site-nav__index { color: var(--color-cyan); }
.site-nav__link[aria-current="page"] .site-nav__index { color: var(--color-accent); }
.site-nav__text { display: inline-block; }

.site-nav-toggle {
  position: relative;
  z-index: 2;
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: 0;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 13px;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
}
.site-nav-toggle:hover { border-color: var(--color-accent); background: rgba(0, 255, 157, 0.05); }
.site-nav-toggle__icon { position: relative; width: 18px; height: 14px; }
.site-nav-toggle__icon::before,
.site-nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  transition: transform 0.2s ease;
}
.site-nav-toggle__icon::before { top: 0; }
.site-nav-toggle__icon::after { bottom: 0; }
.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__icon::before { transform: translateY(6px) rotate(45deg); }
.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__icon::after { transform: translateY(-6px) rotate(-45deg); }

.site-footer {
  position: relative;
  background: var(--color-bg);
  color: var(--color-text);
  border-top: var(--frame-w) solid var(--color-line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: calc(var(--frame-w) + 4px);
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  opacity: 0.9;
  pointer-events: none;
  z-index: 1;
}
.site-footer__bevel {
  position: absolute;
  top: var(--frame-w);
  right: 0;
  width: clamp(120px, 16vw, 200px);
  height: 12px;
  background: var(--color-orange);
  clip-path: polygon(40px 0, 100% 0, 100% 100%, 10px 100%);
  z-index: 2;
  opacity: 0.95;
}
.site-footer__inner {
  position: relative;
  width: min(100% - 2 * var(--gutter), var(--max-w));
  margin-inline: auto;
  padding-block: clamp(40px, 6vw, 72px) clamp(28px, 4vw, 48px);
  display: grid;
  gap: 36px;
}
.site-footer__inner::before,
.site-footer__inner::after {
  content: "";
  position: absolute;
  bottom: 32px;
  width: 10px;
  height: 10px;
  border: 0 solid var(--color-cyan);
  opacity: 0.6;
  pointer-events: none;
}
.site-footer__inner::before { left: -14px; border-width: 0 0 1px 1px; }
.site-footer__inner::after { right: -14px; border-width: 0 1px 1px 0; }

.site-footer__top { display: grid; grid-template-columns: 1fr auto; gap: 28px; align-items: start; }
.site-footer__brand { display: flex; flex-direction: column; gap: 8px; }
.site-footer__code { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.2em; color: var(--color-cyan); }
.site-footer__name { font-size: 22px; font-weight: 700; letter-spacing: 0.04em; color: #fff; }
.site-footer__note { max-width: 42ch; margin: 0; font-size: 13px; line-height: 1.75; color: var(--color-muted); }

.site-footer__nav { display: flex; flex-wrap: wrap; gap: 10px; justify-content: flex-end; }
.site-footer__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--color-line);
  background: transparent;
  font-size: 14px;
  text-decoration: none;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}
.site-footer__link:hover { border-color: var(--color-accent); background: rgba(0, 255, 157, 0.05); color: var(--color-accent); }
.site-footer__link-index { font-family: var(--font-mono); font-size: 11px; color: var(--color-orange); }

.site-footer__meta {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  padding-top: 22px;
  border-top: 1px solid var(--color-line);
  font-size: 13px;
  color: var(--color-muted);
}
.site-footer__contact { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.site-footer__contact-item { display: inline-flex; align-items: center; gap: 8px; }
.site-footer__contact-item::before { content: ""; width: 6px; height: 6px; background: var(--color-accent); flex: none; }
.site-footer__legal { display: flex; flex-direction: column; gap: 4px; text-align: right; font-family: var(--font-mono); font-size: 12px; color: var(--color-muted); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 26px;
  border: 2px solid var(--color-accent);
  background: transparent;
  color: var(--color-accent);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
}
.btn:hover { background: var(--color-accent); color: var(--color-bg); box-shadow: var(--shadow); }
.btn--primary { background: var(--color-accent); color: var(--color-bg); }
.btn--primary:hover { background: transparent; color: var(--color-accent); box-shadow: var(--shadow); }
.btn--orange { border-color: var(--color-orange); color: var(--color-orange); }
.btn--orange:hover { background: var(--color-orange); color: var(--color-bg); }

.breadcrumbs { display: block; padding-block: 16px; font-family: var(--font-mono); font-size: 13px; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 8px; }
.breadcrumbs li { display: inline-flex; align-items: center; }
.breadcrumbs li + li::before { content: "/"; margin-right: 8px; color: var(--color-line); }
.breadcrumbs a { color: var(--color-text); text-decoration: none; }
.breadcrumbs a:hover { color: var(--color-accent); }
.breadcrumbs [aria-current="page"] { color: var(--color-accent); }

.panel {
  position: relative;
  padding: clamp(18px, 3vw, 28px);
  background: var(--color-panel);
  border: 2px solid var(--color-line);
  box-shadow: var(--shadow);
}
.panel__label { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; color: var(--color-accent); text-transform: uppercase; }
.panel__title { margin-top: 8px; margin-bottom: 0; font-size: 20px; }
.panel__chart {
  aspect-ratio: 16 / 8;
  margin-top: 16px;
  border: 1px solid var(--color-line);
  background:
    linear-gradient(rgba(0, 229, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.06) 1px, transparent 1px);
  background-size: 24px 24px;
  position: relative;
}
.panel__chart::before {
  content: "CHART / 16:8";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--color-line);
}

.tag {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--color-line);
  background: var(--color-panel);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--color-cyan);
  text-transform: uppercase;
  line-height: 1.4;
}
.tag--accent { border-color: var(--color-accent); background: var(--color-accent); color: var(--color-bg); }
.tag--orange { border-color: var(--color-orange); background: var(--color-orange); color: var(--color-bg); }

.bevel {
  display: inline-block;
  width: clamp(64px, 10vw, 96px);
  height: 10px;
  background: linear-gradient(100deg, var(--color-accent) 0 62%, var(--color-violet) 62% 100%);
  clip-path: polygon(22px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--color-accent);
  text-transform: uppercase;
}
.section-kicker::before { content: ""; width: 28px; height: 2px; background: var(--color-orange); flex: none; }
.section-title { margin-top: 14px; margin-bottom: 0; font-size: clamp(26px, 4vw, 44px); }
.section-lead { margin-top: 10px; max-width: 60ch; color: var(--color-muted); }

.img-frame {
  position: relative;
  display: block;
  aspect-ratio: 4 / 3;
  background: var(--color-panel);
  border: 2px solid var(--color-line);
  overflow: hidden;
}
.img-frame:empty::after {
  content: "IMG / 4:3";
  position: absolute;
  right: 10px;
  bottom: 10px;
  padding: 5px 8px;
  background: rgba(10, 25, 47, 0.85);
  border: 1px solid var(--color-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--color-accent);
}
.img-frame img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.img-frame--wide { aspect-ratio: 16 / 9; }
.img-frame--wide:empty::after { content: "IMG / 16:9"; }
.img-frame--portrait { aspect-ratio: 3 / 4; }
.img-frame--portrait:empty::after { content: "IMG / 3:4"; }
.img-frame--cover img { object-fit: cover; }

.js [data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity 0.45s ease, transform 0.45s ease; }
.js [data-reveal="in"] { opacity: 1; transform: none; }

@media (max-width: 900px) {
  :root { --header-h: 60px; }
  .site-header__inner { gap: 12px; }
  .site-header__inner::before,
  .site-header__inner::after { display: none; }

  .site-nav-toggle { display: inline-flex; }
  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(10, 25, 47, 0.97);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
  }
  .site-nav[data-open] { opacity: 1; visibility: visible; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 8px; width: min(560px, 88vw); }
  .site-nav__link {
    justify-content: flex-start;
    padding: 16px 20px;
    font-size: 19px;
    border: 1px solid var(--color-line);
    background: var(--color-panel);
  }
  .site-nav__link::before { display: none; }
  .site-nav__link[aria-current="page"] { border-color: var(--color-accent); }

  .site-footer__top { grid-template-columns: 1fr; }
  .site-footer__nav { justify-content: flex-start; }
  .site-footer__meta { grid-template-columns: 1fr; }
  .site-footer__legal { text-align: left; }

  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--aside { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .site-brand__name strong { font-size: 15px; }
  .site-brand__mark { padding: 6px 8px; font-size: 11px; }
  .grid--2, .grid--3, .grid--4, .grid--aside { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
  .site-progress__bar { transition: none; }
  .js [data-reveal] { opacity: 1 !important; transform: none !important; transition: none !important; }
}