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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, figcaption, blockquote, dl, dd {
  margin: 0;
}

ul, ol { padding: 0; list-style: none; }

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

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; }

/* ============ tokens ============ */
:root {
  --c-ink: #071412;
  --c-felt-deep: #0C1F1B;
  --c-felt: #12302A;
  --c-line: #1B463C;
  --c-felt-mid: #2E6B5A;
  --c-mist: #EAF3EF;
  --c-mist-dim: #8FA69D;
  --c-neon: #A56BFF;
  --c-blue: #4FC3F7;
  --c-gold: #E8B44A;
  --c-lime: #38F0A0;
  --c-cyan: #3FD0C9;

  --font-head: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Noto Sans Mono CJK SC", monospace;

  --wrap: 1180px;
  --pad-x: clamp(16px, 3vw, 32px);
  --gap: clamp(16px, 2.2vw, 30px);

  --r-lg: 28px;
  --r-md: 20px;
  --r-sm: 12px;
  --r-pill: 999px;

  --glow-neon: 0 0 22px rgba(165, 107, 255, 0.34);
  --shadow-panel: 0 24px 60px rgba(0, 0, 0, 0.55);
}

/* ============ base ============ */
body {
  min-height: 100vh;
  background-color: var(--c-ink);
  background-image:
    radial-gradient(1100px 620px at 86% -4%, rgba(165, 107, 255, 0.14), transparent 62%),
    radial-gradient(920px 640px at -6% 6%, rgba(46, 107, 90, 0.26), transparent 64%);
  background-repeat: no-repeat;
  color: var(--c-mist);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.03em;
  color: var(--c-mist);
}

h1 { font-size: clamp(2rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.15rem, 2.4vw, 1.5rem); }

p { max-width: 72ch; }

:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection {
  background: rgba(165, 107, 255, 0.4);
  color: #fff;
}

/* ============ skip link ============ */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  background: var(--c-neon);
  color: #0A0F1E;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

/* ============ header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(7, 20, 18, 0.94);
}

.brandbar {
  position: relative;
  padding-top: 3px;
  background: linear-gradient(96deg, #071412 0%, #0C1F1B 52%, #12302A 100%);
  border-bottom: 1px solid rgba(27, 70, 60, 0.8);
}

.brandbar__inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 12px var(--pad-x);
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 22px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex: 0 0 auto;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 13px;
  background: linear-gradient(140deg, var(--c-neon), #6D3BD6);
  color: #080D18;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  box-shadow: var(--glow-neon);
}

.brand__text {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: 0.04em;
  color: var(--c-mist);
}

.brand__text em {
  margin-left: 6px;
  font-style: normal;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-mist-dim);
  vertical-align: 3px;
}

.brandbar__meta {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--c-mist-dim);
  max-width: none;
}

.brandbar__cert {
  padding: 4px 11px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(232, 180, 74, 0.5);
  color: var(--c-gold);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.brandbar__dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--c-felt-mid);
  flex: 0 0 auto;
}

.brandbar__icp,
.brandbar__hours {
  white-space: nowrap;
}

.brandbar__cta {
  flex: 0 0 auto;
  padding: 9px 20px;
  border-radius: var(--r-pill);
  background: var(--c-neon);
  color: #0A0F1E;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: box-shadow 200ms ease, transform 200ms ease;
}

.brandbar__cta:hover {
  box-shadow: var(--glow-neon);
  transform: translateY(-1px);
}

.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 90;
  background: rgba(234, 243, 239, 0.08);
  pointer-events: none;
}

.read-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--c-neon), var(--c-blue) 70%, var(--c-cyan));
  box-shadow: 0 0 12px rgba(165, 107, 255, 0.6);
}

.navbar {
  border-bottom: 1px solid var(--c-line);
  background: rgba(9, 25, 22, 0.92);
  backdrop-filter: blur(10px);
}

.navbar__inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 10px var(--pad-x) 12px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-line);
  background: rgba(18, 48, 42, 0.8);
  color: var(--c-mist);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.site-header[data-open="true"] .nav-toggle {
  border-color: var(--c-neon);
  color: var(--c-neon);
  box-shadow: 0 0 0 3px rgba(165, 107, 255, 0.16);
}

.mainnav {
  flex: 1 1 auto;
  min-width: 0;
}

.mainnav__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.mainnav__item { flex: 0 0 auto; }

.mainnav__link {
  display: inline-flex;
  align-items: center;
  padding: 9px 17px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  color: var(--c-mist-dim);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms ease, background-color 180ms ease, border-color 180ms ease;
}

.mainnav__link:hover {
  color: var(--c-mist);
  background: rgba(18, 48, 42, 0.85);
  border-color: var(--c-line);
}

.mainnav__link[aria-current="page"] {
  background: var(--c-neon);
  border-color: var(--c-neon);
  color: #0A0F1E;
  box-shadow: var(--glow-neon);
}

.navbar__quick {
  flex: 0 0 auto;
  margin-left: auto;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 195, 247, 0.45);
  padding-bottom: 2px;
  transition: border-color 180ms ease, color 180ms ease;
}

.navbar__quick:hover {
  color: #9BE1FF;
  border-color: #9BE1FF;
}

/* ============ tool dock ============ */
.tool-dock {
  position: fixed;
  right: clamp(12px, 2vw, 28px);
  bottom: clamp(16px, 3vw, 36px);
  z-index: 70;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
}

.tool-dock__toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 20px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-line);
  background: var(--c-felt-deep);
  color: var(--c-mist);
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.5);
  transition: border-color 200ms ease, box-shadow 200ms ease, color 200ms ease;
}

.tool-dock__toggle:hover {
  border-color: var(--c-neon);
  color: #fff;
  box-shadow: 0 0 0 3px rgba(165, 107, 255, 0.16), var(--glow-neon);
}

.tool-dock__icon {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--c-neon);
  box-shadow: 0 0 10px var(--c-neon);
}

.tool-dock__panel {
  width: min(330px, calc(100vw - 40px));
  padding: 20px;
  border-radius: var(--r-lg);
  border: 1px solid var(--c-line);
  background: linear-gradient(170deg, #0C1F1B, #071412);
  box-shadow: var(--shadow-panel);
  visibility: hidden;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 200ms ease, transform 260ms cubic-bezier(0.22, 0.61, 0.36, 1), visibility 260ms linear;
}

.tool-dock[data-open="true"] .tool-dock__panel {
  visibility: visible;
  opacity: 1;
  transform: translateY(0);
}

.tool-dock__head { margin-bottom: 14px; }

.tool-dock__kicker {
  display: block;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-felt-mid);
  margin-bottom: 6px;
}

.tool-dock__title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--c-mist);
  max-width: none;
}

.tool-dock__list {
  display: grid;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px dashed var(--c-line);
}

.tool-dock__link {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 11px 14px;
  border-radius: var(--r-md);
  border: 1px solid var(--c-line);
  background: rgba(18, 48, 42, 0.55);
  text-decoration: none;
  transition: border-color 180ms ease, background-color 180ms ease, transform 180ms ease;
}

.tool-dock__link:hover {
  border-color: var(--c-neon);
  background: rgba(165, 107, 255, 0.1);
  transform: translateX(-3px);
}

.tool-dock__label {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-mist);
}

.tool-dock__desc {
  font-size: 12.5px;
  color: var(--c-mist-dim);
}

.tool-dock__foot {
  display: block;
  margin-top: 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--c-lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 240, 160, 0.4);
  padding-bottom: 2px;
  width: fit-content;
}

.tool-dock__foot:hover { border-color: var(--c-lime); }

/* ============ footer ============ */
.site-footer {
  margin-top: clamp(56px, 8vw, 110px);
  border-top: 1px solid var(--c-line);
  background: linear-gradient(180deg, #071412 0%, #0A1A17 100%);
}

.footer__inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(38px, 5vw, 68px) var(--pad-x) 0;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.3fr 0.9fr;
  gap: clamp(22px, 3vw, 46px);
}

.brand--footer { margin-bottom: 14px; }

.footer__tagline {
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-mist-dim);
  max-width: 34ch;
}

.footer__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
  max-width: none;
}

.footer__title {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--c-mist);
  margin-bottom: 14px;
}

.footer__list {
  display: grid;
  gap: 10px;
  font-size: 15px;
}

.footer__list a {
  color: var(--c-mist-dim);
  text-decoration: none;
  transition: color 180ms ease, padding-left 180ms ease;
}

.footer__list a:hover {
  color: var(--c-neon);
  padding-left: 4px;
}

.footer__list--plain li {
  color: var(--c-mist-dim);
  font-size: 14px;
  line-height: 1.7;
}

.footer__list--plain .mono {
  color: var(--c-mist);
  font-size: 14px;
}

.footer__icp {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-mist-dim);
}

.footer__rhythm {
  max-width: var(--wrap);
  margin: clamp(28px, 4vw, 52px) auto 0;
  padding: 18px var(--pad-x);
  display: flex;
  flex-wrap: wrap;
  gap: 10px clamp(18px, 4vw, 48px);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.footer__rhythm span {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-felt-mid);
  position: relative;
  padding-left: 16px;
}

.footer__rhythm span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  border-radius: 50%;
  background: var(--c-neon);
}

.footer__copy {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 18px var(--pad-x) 26px;
  font-size: 13px;
  color: var(--c-mist-dim);
}

/* ============ generic layout ============ */
.wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.section {
  padding-block: clamp(40px, 6vw, 88px);
}

.section__head {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(24px, 3vw, 44px);
}

.section__title {
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  text-shadow: 0 0 24px rgba(165, 107, 255, 0.26);
}

.section__lede {
  font-size: 1.0625rem;
  color: var(--c-mist-dim);
  line-height: 1.75;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.grid__col { grid-column: span 12; }

.prose {
  max-width: 70ch;
  font-size: 1.0625rem;
  line-height: 1.75;
}

.prose > * + * { margin-top: 1em; }

.prose h2,
.prose h3 { margin-top: 1.6em; }

.prose ul,
.prose ol {
  padding-left: 1.2em;
  list-style: disc;
}

.prose li + li { margin-top: 0.4em; }

.card {
  padding: clamp(18px, 2.4vw, 30px);
  border-radius: var(--r-lg);
  border: 1px solid var(--c-line);
  background: var(--c-felt-deep);
  transition: border-color 220ms ease, transform 220ms ease;
}

.card:hover {
  border-color: var(--c-felt-mid);
  transform: translateY(-2px);
}

.panel {
  padding: clamp(16px, 2.2vw, 26px);
  border-radius: var(--r-md);
  border: 1px solid var(--c-line);
  background: var(--c-felt);
}

.divider {
  height: 1px;
  border: 0;
  background: var(--c-line);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
  letter-spacing: 0.04em;
}

/* ============ buttons & chips ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: box-shadow 200ms ease, transform 200ms ease, background-color 200ms ease, border-color 200ms ease;
}

.btn--primary {
  background: var(--c-neon);
  color: #0A0F1E;
}

.btn--primary:hover {
  box-shadow: var(--glow-neon);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  border-color: var(--c-line);
  color: var(--c-mist);
}

.btn--ghost:hover {
  border-color: var(--c-neon);
  color: #fff;
}

.link-quiet {
  color: var(--c-blue);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 195, 247, 0.4);
  padding-bottom: 2px;
  transition: border-color 180ms ease, color 180ms ease;
}

.link-quiet:hover {
  color: #9BE1FF;
  border-color: #9BE1FF;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-line);
  background: rgba(18, 48, 42, 0.7);
  color: var(--c-mist-dim);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.5;
  white-space: nowrap;
}

.chip--neon {
  border-color: rgba(165, 107, 255, 0.5);
  background: rgba(165, 107, 255, 0.14);
  color: #C9A8FF;
}

.chip--gold {
  border-color: rgba(232, 180, 74, 0.5);
  background: rgba(232, 180, 74, 0.12);
  color: var(--c-gold);
}

.chip--lime {
  border-color: rgba(56, 240, 160, 0.45);
  background: rgba(56, 240, 160, 0.1);
  color: var(--c-lime);
}

.chip--cyan {
  border-color: rgba(63, 208, 201, 0.45);
  background: rgba(63, 208, 201, 0.1);
  color: var(--c-cyan);
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* ============ breadcrumb & index ============ */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--c-mist-dim);
  padding-block: 16px;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--c-mist-dim);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--c-felt-mid);
}

a.breadcrumb__item:hover { color: var(--c-neon); }

.coord-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.coord-index__link {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 6px 13px;
  border-radius: var(--r-pill);
  border: 1px solid var(--c-line);
  color: var(--c-mist-dim);
  text-decoration: none;
  transition: color 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.coord-index__link:hover {
  color: var(--c-mist);
  border-color: var(--c-felt-mid);
}

.coord-index__link[data-active="true"] {
  color: var(--c-mist);
  border-color: var(--c-neon);
  background: rgba(165, 107, 255, 0.14);
  box-shadow: 0 0 14px rgba(165, 107, 255, 0.24);
}

/* ============ media containers ============ */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid var(--c-line);
  background: linear-gradient(140deg, #12302A, #071412 70%);
  aspect-ratio: 16 / 10;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__cap {
  position: absolute;
  inset: auto 0 0 0;
  padding: 16px 20px;
  background: linear-gradient(transparent, rgba(7, 20, 18, 0.9));
  color: var(--c-mist);
  font-size: 13px;
  line-height: 1.6;
}

/* ============ reveal ============ */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 200ms ease, transform 200ms ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ============ responsive ============ */
@media (max-width: 1080px) {
  .footer__inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  body { font-size: 16px; }

  .site-header { position: static; }

  .brandbar__inner {
    flex-wrap: wrap;
    gap: 10px;
    padding-block: 10px;
  }

  .brandbar__meta { flex-basis: 100%; order: 3; font-size: 12px; }

  .brandbar__icp,
  .brandbar__hours,
  .brandbar__dot { display: none; }

  .brandbar__cta { margin-left: auto; }

  .nav-toggle { display: inline-flex; }

  .navbar__inner { gap: 10px; }

  .mainnav__list {
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    padding-bottom: 2px;
  }

  .mainnav__list::-webkit-scrollbar { display: none; }

  .site-header[data-open="true"] .mainnav__list {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .navbar__quick { display: none; }

  .tool-dock {
    left: 0;
    right: 0;
    bottom: 0;
    padding: 0 12px 12px;
    gap: 10px;
    align-items: stretch;
  }

  .tool-dock__toggle {
    order: 2;
    align-self: flex-end;
  }

  .tool-dock__panel {
    order: 1;
    width: 100%;
    max-height: min(62vh, 430px);
    overflow: auto;
    border-radius: 24px;
  }

  .site-footer { padding-bottom: 74px; }
}

@media (max-width: 640px) {
  .footer__inner { grid-template-columns: 1fr; }
  .footer__rhythm { font-size: 12px; }
  .section { padding-block: 40px; }
  .media { aspect-ratio: 4 / 3; }
  .media--wide { aspect-ratio: 16 / 10; }
}

/* ============ motion preferences ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

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