/* ===== 01 reset ===== */
*,
*::before,
*::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, ol, ul, figure, blockquote, dl, dd { margin: 0; }
ol, ul { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }

/* ===== 02 tokens ===== */
:root {
  --ink: #060B1A;
  --ink-2: #0C1630;
  --ink-3: #14224A;
  --line: #2A3A63;
  --line-soft: rgba(42, 58, 99, 0.55);
  --signal: #00F0B5;
  --signal-deep: #00C39A;
  --amber: #FFB020;
  --paper: #E8EEF7;
  --muted: #9AA9C4;
  --alert: #FF5C7A;
  --rail-w: 268px;
  --font-display: "Barlow Condensed", "Oswald", "PingFang SC", "Source Han Sans SC", sans-serif;
  --font-num: "JetBrains Mono", "Roboto Mono", ui-monospace, monospace;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --pad: clamp(18px, 4vw, 44px);
  --shadow-hard: 7px 7px 0 0 #02060F;
  --shadow-signal: 7px 7px 0 0 rgba(0, 240, 181, 0.16);
  --shadow-amber: 7px 7px 0 0 rgba(255, 176, 32, 0.14);
  --edge: 2px solid var(--line);
}

/* ===== 03 base ===== */
body {
  min-height: 100vh;
  padding-left: var(--rail-w);
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 82% 8%, rgba(0, 240, 181, 0.075), transparent 42%),
    radial-gradient(circle at 14% 78%, rgba(255, 176, 32, 0.06), transparent 40%);
  background-attachment: fixed;
  color: var(--paper);
  font: 400 16px/1.75 var(--font-body);
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}
p { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; }
::selection { background: var(--signal); color: var(--ink); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 11px 18px;
  background: var(--signal);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.06em;
  box-shadow: var(--shadow-hard);
  transform: translateY(-220%);
  transition: transform 0.16s ease;
}
.skip-link:focus { transform: none; }

/* ===== 04 header rail ===== */
.site-header {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--rail-w);
  background: var(--ink-2);
  border-right: 2px solid var(--line);
  z-index: 80;
}
.rail {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 24px;
  height: 100%;
  padding: 26px 24px 22px;
  overflow-y: auto;
  overscroll-behavior: contain;
}
.rail-progress {
  position: absolute;
  top: 0; right: -2px; bottom: 0;
  width: 3px;
  background: rgba(42, 58, 99, 0.4);
  pointer-events: none;
}
.rail-progress__bar {
  display: block;
  width: 100%;
  height: calc(var(--p, 0) * 100%);
  background: var(--signal);
  box-shadow: 0 0 14px rgba(0, 240, 181, 0.55);
  transition: height 0.12s linear;
}

.brand {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  align-items: center;
  gap: 4px 12px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--signal);
}
.brand__mark {
  grid-row: 1 / 3;
  position: relative;
  width: 36px; height: 36px;
  border: 2px solid var(--signal);
  background: rgba(0, 240, 181, 0.08);
}
.brand__mark::after {
  content: "";
  position: absolute;
  inset: 9px;
  background: var(--signal);
}
.brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 21px;
  line-height: 1.1;
  letter-spacing: 0.05em;
  transition: color 0.12s ease;
}
.brand__sub {
  font-family: var(--font-num);
  font-size: 10px;
  line-height: 1.5;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.brand:hover .brand__name { color: var(--signal); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 2px solid var(--line);
  background: var(--ink-3);
  color: var(--paper);
  cursor: pointer;
  transition: border-color 0.12s ease, color 0.12s ease;
}
.nav-toggle:hover { border-color: var(--signal); color: var(--signal); }
.nav-toggle__bars { display: grid; gap: 4px; width: 18px; }
.nav-toggle__bar { display: block; height: 2px; background: currentColor; }
.nav-toggle__label {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.site-nav { display: flex; flex-direction: column; gap: 12px; }
.site-nav__label {
  font-family: var(--font-num);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}
.site-nav__list { display: flex; flex-direction: column; border-top: 1px solid var(--line-soft); }
.site-nav__item { border-bottom: 1px solid var(--line-soft); }
.site-nav__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0 10px 6px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 500;
  transition: color 0.12s ease, padding-left 0.12s ease, box-shadow 0.12s ease;
}
.site-nav__num {
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--line);
  transition: color 0.12s ease;
}
.site-nav__text { letter-spacing: 0.03em; }
.site-nav__link:hover { color: var(--paper); padding-left: 12px; }
.site-nav__link:hover .site-nav__num { color: var(--signal); }
.site-nav__link[aria-current="page"] {
  color: var(--signal);
  padding-left: 12px;
  box-shadow: inset 3px 0 0 0 var(--signal);
}
.site-nav__link[aria-current="page"] .site-nav__num { color: var(--amber); }

.rail__cta {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
}
.rail__note {
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
  font-family: var(--font-num);
  font-size: 10px;
  line-height: 1.7;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ===== 05 buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border: 2px solid transparent;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.06em;
  text-align: center;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background-color 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}
.btn--primary {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
  box-shadow: 5px 5px 0 0 rgba(0, 240, 181, 0.24);
}
.btn--primary:hover {
  background: var(--signal-deep);
  border-color: var(--signal-deep);
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 0 rgba(0, 240, 181, 0.3);
}
.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--paper);
}
.btn--ghost:hover { border-color: var(--amber); color: var(--amber); }
.btn--block { width: 100%; }

/* ===== 06 footer ===== */
.site-footer {
  position: relative;
  overflow: hidden;
  padding: clamp(44px, 6vw, 76px) var(--pad) 28px;
  background: var(--ink-2);
  border-top: 3px solid var(--line);
}
.footer__watermark {
  position: absolute;
  right: -0.06em;
  bottom: -0.24em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(78px, 15vw, 210px);
  line-height: 0.8;
  letter-spacing: -0.02em;
  color: rgba(42, 58, 99, 0.32);
  pointer-events: none;
  user-select: none;
}
.footer__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}
.footer__top {
  display: grid;
  grid-template-columns: minmax(240px, 1.05fr) 2fr;
  gap: clamp(24px, 4vw, 58px);
}
.footer__brand { display: grid; gap: 14px; align-content: start; }
.footer__kicker {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.1;
  letter-spacing: 0.05em;
}
.footer__kicker::after {
  content: "";
  display: block;
  width: 56px;
  height: 4px;
  margin-top: 12px;
  background: var(--signal);
}
.footer__tagline { max-width: 36ch; color: var(--muted); font-size: 15px; line-height: 1.75; }
.footer__badge {
  justify-self: start;
  padding: 8px 10px;
  border: 1px dashed rgba(255, 176, 32, 0.45);
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
}
.footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(140px, 1fr));
  gap: 22px;
}
.footer__col { display: grid; gap: 12px; align-content: start; }
.footer__col-title {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
}
.footer__list { display: grid; gap: 9px; }
.footer__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 15px;
  transition: color 0.12s ease, gap 0.12s ease;
}
.footer__link::before { content: "—"; color: var(--line); transition: color 0.12s ease; }
.footer__link:hover { color: var(--paper); gap: 13px; }
.footer__link:hover::before { color: var(--signal); }

.footer__contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px 26px;
  padding: 22px 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.footer__item { display: grid; gap: 7px; align-content: start; }
.footer__label {
  font-family: var(--font-num);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.footer__value {
  font-family: var(--font-num);
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}
.footer__value--wide { font-family: var(--font-body); font-size: 14px; color: var(--muted); }
.footer__copy {
  justify-self: start;
  margin-top: 2px;
  padding: 5px 10px;
  border: 1px solid rgba(0, 240, 181, 0.5);
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
  cursor: pointer;
  transition: background-color 0.12s ease, color 0.12s ease;
}
.footer__copy:hover { background: var(--signal); color: var(--ink); }

.footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 26px;
  color: var(--muted);
}
.footer__legal {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
}
.footer__fine { max-width: 56ch; font-size: 13px; line-height: 1.7; }

/* ===== 07 layout primitives ===== */
.container {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--pad);
}
.section { position: relative; padding: clamp(46px, 7vw, 92px) 0; }
.section--tint { background: var(--ink-2); }
.section--panel { background: var(--ink-3); }
.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 14px 22px;
  margin-bottom: 30px;
}
.section__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(34px, 5.5vw, 62px);
  line-height: 0.85;
  color: var(--line);
}
@supports (-webkit-text-stroke: 2px red) {
  .section__num { color: transparent; -webkit-text-stroke: 2px var(--line); }
}
.section__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.06;
  letter-spacing: 0.02em;
}
.lede {
  max-width: 64ch;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.72;
  color: var(--paper);
}
.rule {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.rule::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line-soft);
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid rgba(0, 240, 181, 0.42);
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal);
}
.tag--amber { border-color: rgba(255, 176, 32, 0.45); color: var(--amber); }
.tag--muted { border-color: var(--line); color: var(--muted); }

.grid { display: grid; gap: clamp(18px, 3vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--ink-3);
  border: var(--edge);
  box-shadow: var(--shadow-hard);
}
.card--signal { border-color: rgba(0, 240, 181, 0.5); box-shadow: var(--shadow-signal); }
.card--amber { border-color: rgba(255, 176, 32, 0.48); box-shadow: var(--shadow-amber); }

/* ===== 08 media containers ===== */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: var(--edge);
  background: linear-gradient(152deg, var(--ink-3), var(--ink-2));
}
.media > img,
.media > svg,
.media > video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }
.media__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 10px 12px;
  background: linear-gradient(to top, rgba(6, 11, 26, 0.94), transparent);
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ===== 09 breadcrumbs & prose ===== */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.breadcrumbs__item { display: inline-flex; align-items: center; gap: 10px; }
.breadcrumbs__item + .breadcrumbs__item::before { content: "/"; color: var(--line); }
.breadcrumbs a:hover { color: var(--signal); }

.prose {
  display: grid;
  gap: 18px;
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.82;
  color: var(--paper);
}
.prose h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 24px;
  letter-spacing: 0.02em;
}
.prose ul { display: grid; gap: 8px; }
.prose li { position: relative; padding-left: 20px; color: var(--muted); }
.prose li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.78em;
  width: 10px; height: 2px;
  background: var(--signal);
}
.prose a { color: var(--signal); border-bottom: 1px solid rgba(0, 240, 181, 0.4); }

/* ===== 10 motion ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
[data-reveal].is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  .rail-progress__bar { transition: none; }
  .btn, .footer__link, .site-nav__link { transition: none; }
  .btn--primary:hover { transform: none; }
}

/* ===== 11 responsive ===== */
@media (max-width: 1180px) {
  :root { --rail-w: 236px; }
}

@media (max-width: 980px) {
  body { padding-left: 0; }
  .skip-link { left: 12px; }
  .site-header {
    position: sticky;
    top: 0; left: 0; right: 0; bottom: auto;
    width: 100%;
    border-right: 0;
    border-bottom: 2px solid var(--line);
  }
  .rail {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    height: auto;
    padding: 12px 16px;
    overflow: visible;
  }
  .brand {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 3px 10px;
    flex: 1 1 auto;
    padding-bottom: 0;
    border-bottom: 0;
  }
  .brand__mark { width: 30px; height: 30px; }
  .brand__mark::after { inset: 7px; }
  .brand__name { font-size: 18px; }
  .brand__sub { font-size: 9px; letter-spacing: 0.1em; }
  .nav-toggle { display: inline-flex; margin-left: auto; }

  .rail-progress {
    top: auto; left: 0; right: 0; bottom: -2px;
    width: auto; height: 3px;
  }
  .rail-progress__bar {
    width: calc(var(--p, 0) * 100%);
    height: 100%;
    min-height: 3px;
  }

  .site-nav,
  .rail__cta {
    flex: 1 1 100%;
    width: 100%;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.32s ease, opacity 0.22s ease;
  }
  .site-header[data-open] .site-nav {
    max-height: 62vh;
    opacity: 1;
    overflow-y: auto;
    padding-top: 6px;
  }
  .site-header[data-open] .rail__cta {
    max-height: 260px;
    opacity: 1;
    margin-top: 4px;
    flex-direction: row;
    flex-wrap: wrap;
  }
  .rail__cta .btn { flex: 1 1 170px; }
  .rail__note { flex: 1 1 100%; padding-top: 10px; }
}

@media (max-width: 900px) {
  .footer__top { grid-template-columns: 1fr; }
  .footer__nav { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); }
}

@media (max-width: 720px) {
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
  .footer__watermark { font-size: clamp(66px, 22vw, 130px); }
  .footer__col-title { font-size: 10px; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .footer__nav { grid-template-columns: 1fr 1fr; }
  .section__head { gap: 10px 14px; }
  .rail__cta .btn { flex: 1 1 100%; }
}