/* =========================================================
   /assets/site.css — 共享外壳样式
   深墨夜景底 + 霓虹青绿/电光紫线框 + 纸感面板
   ========================================================= */

/* ---------- 1. Tokens ---------- */
:root {
  --ink-900: #0A0F14;
  --panel: #131C24;
  --line: #243440;
  --neon: #2FE3C0;
  --violet: #8A6BFF;
  --orange: #FF8A3D;
  --paper: #F3EBDD;
  --paper-ink: #1B1410;
  --muted: #9FB0BC;
  --text: #DCE6EC;
  --title: #F2F7F9;

  --track-w: 220px;
  --brand-bar-h: 56px;
  --shell-w: 1180px;

  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --ease-out: cubic-bezier(.22, .68, .3, 1);
}

/* ---------- 2. Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  background: var(--ink-900);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: transparent;
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 夜间网格与光晕场 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(760px 560px at 88% -10%, rgba(138, 107, 255, .22), transparent 65%),
    radial-gradient(620px 460px at 2% 10%, rgba(47, 227, 192, .13), transparent 62%),
    repeating-linear-gradient(90deg, rgba(36, 52, 64, .45) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(36, 52, 64, .45) 0 1px, transparent 1px 72px);
}

::selection { background: var(--neon); color: #04120F; }

img, svg, video { max-width: 100%; height: auto; }
img { border: 0; }

/* ---------- 3. Typography ---------- */
h1, h2, h3, h4, h5 {
  margin: 0 0 .6em;
  color: var(--title);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: .03em;
}

h1 { font-size: clamp(2rem, 5.6vw, 3.6rem); font-weight: 900; letter-spacing: .04em; }
h2 { font-size: clamp(1.5rem, 3.4vw, 2.25rem); }
h3 { font-size: clamp(1.1rem, 2.2vw, 1.35rem); letter-spacing: .02em; }
h4 { font-size: 1.02rem; letter-spacing: .02em; }

p { margin: 0 0 1em; }

a { color: var(--neon); text-decoration: none; }
a:hover { color: #FFFFFF; }

strong, b { color: var(--title); font-weight: 700; }

small { font-size: .8em; }

hr {
  border: 0;
  border-top: 1px dashed var(--line);
  margin: 2rem 0;
}

.mono { font-family: var(--mono); letter-spacing: .06em; }
.text-muted { color: var(--muted); }

/* ---------- 4. Focus & skip link ---------- */
:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  top: -72px;
  left: 1rem;
  z-index: 90;
  padding: .7rem 1rem;
  background: var(--neon);
  color: #04120F;
  font: 700 .85rem/1 var(--sans);
  letter-spacing: .04em;
  transition: top .2s ease;
}
.skip-link:focus { top: .6rem; color: #04120F; }

#main-content:focus { outline: none; }

/* ---------- 5. Header: brand bar ---------- */
.site-header { position: relative; }

.brand-bar {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--brand-bar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 clamp(.8rem, 2.6vw, 1.4rem);
  background: rgba(10, 15, 20, .9);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  z-index: 60;
}
.brand-bar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, rgba(47, 227, 192, .55), rgba(138, 107, 255, .45), transparent);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .62rem;
  min-width: 0;
  color: var(--title);
}
.brand:hover { color: var(--title); }

.brand__mark {
  flex: 0 0 auto;
  width: 24px;
  height: 24px;
  background: linear-gradient(140deg, var(--neon), var(--violet));
  clip-path: polygon(0 0, 100% 0, 100% 58%, 58% 100%, 0 100%);
  box-shadow: 0 0 16px rgba(47, 227, 192, .5);
}

.brand__text { display: flex; flex-direction: column; min-width: 0; line-height: 1.15; }
.brand__name {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: .06em;
  white-space: nowrap;
}
.brand__sub {
  font: 500 .6rem/1.3 var(--mono);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.brand-bar__tools {
  display: flex;
  align-items: center;
  gap: .45rem;
  flex: 0 0 auto;
}

.tool-link {
  padding: .5rem .7rem;
  border: 1px solid transparent;
  color: var(--muted);
  font: 500 .74rem/1 var(--mono);
  letter-spacing: .08em;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}
.tool-link:hover {
  color: var(--neon);
  border-color: var(--line);
  background: rgba(47, 227, 192, .06);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: .45rem;
  padding: .46rem .7rem;
  background: rgba(19, 28, 36, .92);
  border: 1px solid var(--line);
  color: var(--text);
  font: 600 .78rem/1 var(--sans);
  letter-spacing: .08em;
  cursor: pointer;
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}
.nav-toggle:hover { border-color: var(--neon); color: var(--neon); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform .22s ease, top .22s ease;
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

.nav-toggle__text { white-space: nowrap; }

/* ---------- 6. Track navigation ---------- */
.track-nav {
  position: fixed;
  top: var(--brand-bar-h);
  left: 0;
  bottom: 0;
  width: var(--track-w);
  display: flex;
  flex-direction: column;
  padding: 1.35rem 0 1.1rem;
  background: linear-gradient(180deg, #101922 0%, #0B1218 100%);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  overscroll-behavior: contain;
  visibility: visible;
  z-index: 55;
}

.track-nav__cap {
  margin: 0 0 .9rem;
  padding: 0 1.35rem;
  color: #5F7A88;
  font: 500 .66rem/1 var(--mono);
  letter-spacing: .22em;
  text-transform: uppercase;
}

.track-nav__list {
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 0;
  list-style: none;
}

.track-nav__item { position: relative; }

.track-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .68rem 1.2rem .68rem 1.35rem;
  color: #B9CBD5;
  font-size: .94rem;
  font-weight: 500;
  letter-spacing: .02em;
  transition: color .2s ease, background-color .2s ease;
}
.track-nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--neon), var(--violet));
  transform: scaleY(0);
  transform-origin: center;
  transition: transform .26s var(--ease-out);
}
.track-nav__link:hover {
  color: #FFFFFF;
  background: rgba(47, 227, 192, .06);
}
.track-nav__link:hover::before { transform: scaleY(1); }
.track-nav__link:hover .track-nav__num { color: var(--neon); }

.track-nav__link[aria-current="page"] {
  color: var(--neon);
  background: rgba(47, 227, 192, .09);
}
.track-nav__link[aria-current="page"]::before { transform: scaleY(1); }
.track-nav__link[aria-current="page"] .track-nav__num { color: var(--violet); }
.track-nav__link[aria-current="page"] .track-nav__label { font-weight: 700; }

.track-nav__num {
  flex: 0 0 auto;
  font: 500 .72rem/1 var(--mono);
  letter-spacing: .06em;
  color: #55707E;
  transition: color .2s ease;
}

.track-nav__label {
  flex: 1 1 auto;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.track-nav__foot {
  margin-top: auto;
  padding: 1rem 1.35rem 0;
  border-top: 1px dashed var(--line);
  display: flex;
  flex-direction: column;
  gap: .35rem;
}
.track-nav__stamp {
  font: 500 .68rem/1.5 var(--mono);
  letter-spacing: .06em;
  color: #5F7A88;
}
.track-nav__meta {
  font-size: .7rem;
  line-height: 1.6;
  letter-spacing: .04em;
  color: #4F6673;
}

/* 遮罩 */
.nav-scrim {
  position: fixed;
  inset: var(--brand-bar-h) 0 0 0;
  background: rgba(4, 8, 11, .66);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity .28s ease, visibility .28s ease;
  z-index: 65;
}
body.nav-open .nav-scrim {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* ---------- 7. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  padding: clamp(2rem, 5vw, 3.2rem) 0 1.6rem;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(19, 28, 36, .55), rgba(8, 12, 16, .96));
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, rgba(47, 227, 192, .5), rgba(138, 107, 255, .5), transparent);
}

.site-footer__inner {
  width: min(100% - 2.2rem, var(--shell-w));
  margin-inline: auto;
}

.footer-band {
  display: grid;
  grid-template-columns: 1.15fr 1fr 1fr;
  gap: 1.6rem;
  padding-bottom: 1.8rem;
  border-bottom: 1px dashed var(--line);
}

.footer-band__col--brand {
  padding-left: 1rem;
  border-left: 3px solid rgba(47, 227, 192, .5);
}

.footer-cap {
  margin: 0 0 .75rem;
  color: var(--violet);
  font: 500 .68rem/1 var(--mono);
  letter-spacing: .2em;
  text-transform: uppercase;
}

.footer-brand {
  margin: 0 0 .35rem;
  color: var(--title);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: .06em;
}
.footer-brand__sub {
  margin: 0 0 .75rem;
  color: var(--muted);
  font: 500 .7rem/1.5 var(--mono);
  letter-spacing: .12em;
}
.footer-icp {
  display: inline-block;
  margin: 0;
  padding: .32rem .58rem;
  border: 1px solid var(--line);
  background: rgba(47, 227, 192, .05);
  color: var(--muted);
  font: 500 .7rem/1 var(--mono);
  letter-spacing: .06em;
}

.footer-line {
  margin: 0 0 .42rem;
  color: #C8D6DE;
  font-size: .9rem;
  word-break: break-word;
}
.footer-note {
  margin: .6rem 0 0;
  color: #7C93A0;
  font-size: .78rem;
  line-height: 1.75;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .8rem 1.4rem;
  padding-top: 1.35rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-links a {
  color: var(--muted);
  font-size: .84rem;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.footer-links a:hover {
  color: var(--neon);
  border-color: var(--neon);
}

.footer-copy {
  margin: 0;
  color: #5F7A88;
  font: 500 .72rem/1.6 var(--mono);
  letter-spacing: .05em;
}

.footer-top {
  padding: .42rem .72rem;
  border: 1px solid rgba(255, 138, 61, .42);
  color: var(--orange);
  font: 500 .78rem/1 var(--mono);
  letter-spacing: .08em;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}
.footer-top:hover {
  color: #FFB27A;
  border-color: var(--orange);
  background: rgba(255, 138, 61, .14);
}

/* ---------- 8. Layout ---------- */
.shell {
  width: min(100% - 2.2rem, var(--shell-w));
  margin-inline: auto;
}

.section { padding: clamp(2.2rem, 5vw, 3.6rem) 0; }
.section--tight { padding: clamp(1.4rem, 3vw, 2.2rem) 0; }
.section--band {
  background: rgba(19, 28, 36, .42);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.grid { display: grid; gap: clamp(.9rem, 2vw, 1.25rem); }
.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)); }

/* ---------- 9. Components ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin: 0 0 .9rem;
  color: var(--neon);
  font: 500 .7rem/1 var(--mono);
  letter-spacing: .2em;
  text-transform: uppercase;
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), var(--violet));
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: .5rem 1rem;
  margin: 0 0 1.4rem;
  padding-bottom: .75rem;
  border-bottom: 1px solid var(--line);
}
.section-head__num {
  font: 500 .78rem/1.4 var(--mono);
  letter-spacing: .12em;
  color: var(--violet);
}
.section-head__title { flex: 1 1 auto; min-width: 0; margin: 0; }
.section-head__meta {
  margin: 0;
  color: var(--muted);
  font: 500 .72rem/1.6 var(--mono);
  letter-spacing: .06em;
}

.index-band {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
  margin: 0 0 1.6rem;
  padding: 0;
  list-style: none;
}
.index-band a {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .42rem .72rem;
  border: 1px solid var(--line);
  background: rgba(19, 28, 36, .6);
  color: var(--muted);
  font: 500 .76rem/1 var(--mono);
  letter-spacing: .06em;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease, transform .2s ease;
}
.index-band a:hover {
  color: var(--neon);
  border-color: rgba(47, 227, 192, .5);
  background: rgba(47, 227, 192, .08);
  transform: translateY(-2px);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .24rem .55rem;
  border: 1px solid rgba(138, 107, 255, .35);
  background: rgba(138, 107, 255, .1);
  color: #B9A6FF;
  font: 500 .68rem/1.2 var(--mono);
  letter-spacing: .08em;
  text-transform: uppercase;
}
.tag--neon {
  border-color: rgba(47, 227, 192, .35);
  background: rgba(47, 227, 192, .1);
  color: var(--neon);
}
.tag--warm {
  border-color: rgba(255, 138, 61, .38);
  background: rgba(255, 138, 61, .1);
  color: #FFB27A;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: .55rem;
  padding: 1.1rem 1.15rem 1.2rem;
  background: var(--panel);
  border: 1px solid var(--line);
  transition: transform .24s var(--ease-out), border-color .24s ease, box-shadow .24s ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: rgba(47, 227, 192, .45);
  box-shadow: 0 14px 30px rgba(0, 0, 0, .45);
}
.card__index {
  font: 500 .72rem/1 var(--mono);
  letter-spacing: .1em;
  color: var(--neon);
}
.card__title {
  margin: 0;
  color: var(--title);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .02em;
}
.card__text {
  margin: 0;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.75;
}
.card__foot {
  margin-top: auto;
  padding-top: .7rem;
  color: #6D8794;
  font: 500 .72rem/1.6 var(--mono);
  letter-spacing: .05em;
}

.plate {
  position: relative;
  padding: clamp(1.1rem, 2.6vw, 2rem);
  background: var(--paper);
  color: var(--paper-ink);
  border: 1px solid #C8BCA6;
  box-shadow: 7px 7px 0 rgba(0, 0, 0, .4);
}
.plate h1, .plate h2, .plate h3, .plate h4 { color: var(--paper-ink); }
.plate a { color: #8A3A00; text-decoration: underline; text-underline-offset: 3px; }
.plate a:hover { color: #B34A00; }
.plate__cap {
  margin: 0 0 .8rem;
  color: #7A6A54;
  font: 500 .7rem/1 var(--mono);
  letter-spacing: .16em;
  text-transform: uppercase;
}

.note {
  position: relative;
  padding: .82rem .95rem;
  border-left: 2px solid var(--orange);
  background: rgba(255, 138, 61, .07);
  color: #C8D6DE;
  font-size: .85rem;
  line-height: 1.75;
}
.note__cap {
  display: block;
  margin-bottom: .4em;
  color: var(--orange);
  font: 500 .68rem/1 var(--mono);
  letter-spacing: .14em;
  text-transform: uppercase;
}

.prose {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
}
.prose p { margin: 0 0 1.05em; }
.prose h2 { margin: 1.9em 0 .6em; font-size: clamp(1.35rem, 2.6vw, 1.8rem); }
.prose h3 { margin: 1.6em 0 .5em; font-size: 1.12rem; }
.prose ul, .prose ol { margin: 0 0 1.1em; padding-left: 1.25em; }
.prose li { margin-bottom: .45em; }
.prose code {
  padding: .1em .38em;
  border: 1px solid rgba(47, 227, 192, .28);
  background: rgba(47, 227, 192, .1);
  color: var(--neon);
  font: 500 .85em/1.6 var(--mono);
}
.plate .prose code {
  border-color: rgba(27, 20, 16, .22);
  background: rgba(27, 20, 16, .08);
  color: var(--paper-ink);
}

.frame {
  position: relative;
  padding: clamp(1.1rem, 3vw, 2.4rem);
  border: 1px solid var(--line);
  background: linear-gradient(155deg, rgba(19, 28, 36, .92), rgba(10, 15, 20, .65));
  overflow: hidden;
}
.frame::before,
.frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid var(--neon);
  pointer-events: none;
}
.frame::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.frame::after { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

.scale-rule {
  height: 10px;
  border-bottom: 1px solid var(--line);
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 16px);
}
.scale-rule--top {
  border-bottom: 0;
  border-top: 1px solid var(--line);
}

.slash {
  position: absolute;
  left: -20%;
  top: 38%;
  width: 140%;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, rgba(47, 227, 192, .85), rgba(138, 107, 255, .7), transparent);
  transform: rotate(-7deg);
}
.slash--soft { height: 2px; opacity: .42; }

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(138, 107, 255, .18), rgba(47, 227, 192, .12)),
    var(--panel);
  aspect-ratio: 16 / 9;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(135deg, rgba(47, 227, 192, .07) 0 1px, transparent 1px 12px);
}
.media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: .45rem .7rem;
  border-top: 1px solid rgba(47, 227, 192, .35);
  background: linear-gradient(90deg, rgba(10, 15, 20, .92), rgba(10, 15, 20, .35));
  color: #E8F2F5;
  font: 500 .68rem/1.4 var(--mono);
  letter-spacing: .08em;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .72rem 1.15rem;
  border: 1px solid var(--line);
  background: rgba(19, 28, 36, .85);
  color: var(--text);
  font: 600 .88rem/1 var(--sans);
  letter-spacing: .04em;
  cursor: pointer;
  text-decoration: none;
  transition: transform .2s var(--ease-out), background-color .2s ease, border-color .2s ease, color .2s ease;
}
.btn:hover {
  transform: translateY(-2px);
  border-color: var(--neon);
  color: var(--neon);
}
.btn--primary {
  border-color: var(--orange);
  background: var(--orange);
  color: #1B1410;
}
.btn--primary:hover {
  border-color: #FFA463;
  background: #FFA463;
  color: #1B1410;
}
.btn--ghost {
  border-color: rgba(47, 227, 192, .5);
  background: transparent;
  color: var(--neon);
}
.btn--ghost:hover { background: rgba(47, 227, 192, .12); color: var(--neon); }
.btn__meta {
  font: 500 .7rem/1 var(--mono);
  letter-spacing: .1em;
  opacity: .78;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0 0 1.4rem;
  padding: 0;
  list-style: none;
  color: #6D8794;
  font: 500 .74rem/1.5 var(--mono);
  letter-spacing: .05em;
}
.breadcrumb li { display: inline-flex; align-items: center; gap: .45rem; }
.breadcrumb li + li::before { content: "/"; color: var(--line); }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--neon); }
.breadcrumb [aria-current="page"] { color: var(--neon); }

/* ---------- 10. Motion ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--neon), var(--violet), var(--orange));
  pointer-events: none;
  z-index: 80;
}

[data-reveal] {
  transition: opacity .5s ease, transform .55s var(--ease-out);
}
[data-reveal].is-armed {
  opacity: 0;
  transform: translateY(16px);
}
[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

[data-reveal-stagger] > * {
  transition: opacity .5s ease, transform .55s var(--ease-out);
  transition-delay: calc(var(--i, 0) * 80ms);
}
[data-reveal-stagger].is-armed > * {
  opacity: 0;
  transform: translateY(16px);
}
[data-reveal-stagger].is-in > * {
  opacity: 1;
  transform: none;
}

/* ---------- 11. Responsive shell ---------- */
@media (min-width: 1024px) {
  body {
    padding-top: var(--brand-bar-h);
    padding-left: var(--track-w);
  }
  nav.track-nav { visibility: visible; }
  .nav-scrim { display: none; }
}

@media (max-width: 1023px) {
  body { padding-top: var(--brand-bar-h); }

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

  .track-nav {
    width: min(86vw, 320px);
    visibility: hidden;
    transform: translateX(-104%);
    box-shadow: 24px 0 60px rgba(0, 0, 0, .55);
    transition: transform .34s var(--ease-out), visibility .34s linear;
    z-index: 70;
  }
  .track-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
  }

  .footer-band { grid-template-columns: 1fr 1fr; }
  .footer-band__col--brand { grid-column: 1 / -1; }
}

@media (max-width: 960px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .tool-link { display: none; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 680px) {
  .footer-band { grid-template-columns: 1fr; }
  .footer-band__col--brand { padding-left: .85rem; }
  .footer-base { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 620px) {
  body { font-size: 15px; }
  .brand-bar__tools { gap: .3rem; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .shell, .site-footer__inner { width: min(100% - 1.5rem, var(--shell-w)); }
}

/* ---------- 12. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal],
  [data-reveal].is-armed,
  [data-reveal-stagger].is-armed > * {
    opacity: 1 !important;
    transform: none !important;
  }
  .btn:hover,
  .card:hover,
  .index-band a:hover { transform: none; }
}