/* =========================================================
   /assets/site.css — 博业体育 共享外壳
   数字化战术板：框架式导航 + 左侧索引轨道 + 研究板组件
   ========================================================= */

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

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

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

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

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

button { font: inherit; color: inherit; background: none; border: 0; }

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

/* ---------- tokens ---------- */
:root {
  --ink-900: #0B1412;
  --charcoal-800: #15181A;
  --forest-700: #12352C;
  --lime-400: #C6FF3D;
  --lime-200: #E4FF9B;
  --orange-500: #FF7A2F;
  --slate-500: #6E8CA0;
  --mist-100: #E8F0EC;
  --line-600: #2A3A36;

  --ink-raise: #101A18;
  --mist-dim: #A9B8B2;

  --font-display: "Oswald", "Barlow Condensed", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --rail-w: 216px;
  --header-h: 84px;
  --header-h-compact: 62px;
  --wrap: 1180px;
  --wrap-wide: 1440px;

  --space-s: 12px;
  --space-m: 20px;
  --space-l: 40px;
  --space-xl: 96px;
  --space-xxl: 140px;

  --radius-s: 2px;
  --radius-m: 4px;
  --shadow-1: 0 1px 0 rgba(198, 255, 61, 0.04), 0 12px 28px -20px rgba(0, 0, 0, 0.9);

  --dur-fast: 160ms;
  --dur-mid: 220ms;
  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- base ---------- */
html { scroll-behavior: smooth; }

body {
  background-color: var(--ink-900);
  color: var(--mist-100);
  font-family: var(--font-body);
  font-size: 16.5px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.012em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  background-image:
    radial-gradient(1200px 620px at 88% -12%, rgba(18, 53, 44, 0.62), transparent 66%),
    radial-gradient(760px 480px at -8% 8%, rgba(110, 140, 160, 0.13), transparent 70%);
  background-repeat: no-repeat;
}

p { max-width: 68ch; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 300;
  letter-spacing: 0.005em;
  line-height: 1.06;
  color: var(--mist-100);
}

h2 { font-size: clamp(2rem, 4vw, 2.9rem); }
h3 { font-size: clamp(1.35rem, 2.2vw, 1.7rem); font-weight: 400; }

strong { font-weight: 600; color: var(--lime-200); }

::selection { background: var(--lime-400); color: var(--ink-900); }

:focus-visible {
  outline: 2px solid var(--lime-400);
  outline-offset: 3px;
  border-radius: var(--radius-s);
}

/* ---------- frame ---------- */
.site-frame {
  min-height: 100vh;
  border-top: 1px solid var(--line-600);
  display: flex;
  flex-direction: column;
}

.site-main {
  flex: 1 0 auto;
  padding-block: 0 var(--space-xl);
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--space-m);
}

.wrap--wide {
  max-width: var(--wrap-wide);
  padding-inline: var(--space-m);
}

@media (min-width: 768px) {
  .wrap, .wrap--wide { padding-inline: var(--space-l); }
}

/* skip link */
.skip-link {
  position: absolute;
  left: var(--space-m);
  top: 8px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--lime-400);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  border-radius: var(--radius-m);
  transform: translateY(-160%);
  transition: transform var(--dur-fast) var(--ease-out);
}

.skip-link:focus-visible {
  transform: translateY(0);
  outline-offset: 2px;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 20, 18, 0.94);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-600);
  color: var(--mist-100);
  transition: box-shadow var(--dur-mid) var(--ease-out);
}

.site-header[data-compact] {
  box-shadow: 0 1px 0 rgba(42, 58, 54, 0.9), 0 18px 30px -34px rgba(0, 0, 0, 1);
}

.site-header__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "brand actions"
    "nav nav";
  align-items: center;
  gap: var(--space-s) var(--space-m);
  min-height: var(--header-h);
  padding-block: 14px;
  transition: min-height var(--dur-mid) var(--ease-out), padding-block var(--dur-mid) var(--ease-out);
}

.site-header[data-compact] .site-header__inner {
  min-height: var(--header-h-compact);
  padding-block: 8px;
}

/* brand */
.brand { grid-area: brand; min-width: 0; }

.brand__link {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 10px;
}

.brand__mark {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--mist-100);
  white-space: nowrap;
}

.brand__dot {
  width: 7px;
  height: 7px;
  background: var(--lime-400);
  border-radius: 50%;
  transform: translateY(-3px);
  box-shadow: 0 0 0 3px rgba(198, 255, 61, 0.14);
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--mist-dim);
  white-space: nowrap;
}

.brand__link:hover .brand__tagline { color: var(--lime-200); }
.brand__link:hover .brand__dot { box-shadow: 0 0 0 5px rgba(198, 255, 61, 0.2); }

/* header actions */
.header-actions {
  grid-area: actions;
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 14px;
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  white-space: nowrap;
  transition: background-color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}

.header-cta--ghost {
  color: var(--mist-100);
  background: transparent;
}

.header-cta--ghost:hover {
  border-color: var(--lime-400);
  color: var(--lime-200);
}

.header-cta--solid {
  background: var(--lime-400);
  border-color: var(--lime-400);
  color: var(--ink-900);
}

.header-cta--solid:hover {
  background: var(--lime-200);
  border-color: var(--lime-200);
}

/* nav toggle */
.nav-toggle {
  grid-area: actions;
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  background: var(--charcoal-800);
  color: var(--mist-100);
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}

.nav-toggle:hover { border-color: var(--lime-400); color: var(--lime-200); }

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur-mid) var(--ease-out), opacity var(--dur-fast) var(--ease-out);
}

.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
}

.site-header[data-open] .nav-toggle {
  border-color: var(--lime-400);
  color: var(--lime-400);
}

.site-header[data-open] .nav-toggle__bars span:first-child {
  transform: translateY(2.75px) rotate(45deg);
}

.site-header[data-open] .nav-toggle__bars span:last-child {
  transform: translateY(-2.75px) rotate(-45deg);
}

/* nav */
.site-nav {
  grid-area: nav;
  display: none;
  border-top: 1px solid var(--line-600);
  padding-top: var(--space-s);
}

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

.site-nav__list {
  display: grid;
  gap: 2px;
}

.site-nav__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 10px;
  border-left: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.13em;
  color: var(--mist-dim);
  transition: color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out);
}

.site-nav__link:hover {
  color: var(--lime-200);
  background: rgba(198, 255, 61, 0.05);
  border-left-color: var(--lime-400);
}

.site-nav__link[aria-current="page"] {
  color: var(--lime-400);
  border-left-color: var(--lime-400);
  background: linear-gradient(90deg, rgba(198, 255, 61, 0.1), transparent 72%);
}

@media (min-width: 900px) {
  .site-header__inner {
    grid-template-columns: auto 1fr auto;
    grid-template-areas: "brand nav actions";
    gap: var(--space-l);
  }

  .nav-toggle { display: none; }

  .site-nav {
    display: block;
    border-top: 0;
    padding-top: 0;
    justify-self: center;
  }

  .site-nav__list {
    display: flex;
    align-items: center;
    gap: 2px;
  }

  .site-nav__link {
    border-left: 0;
    border-bottom: 2px solid transparent;
    padding: 10px 12px;
    letter-spacing: 0.1em;
    position: relative;
  }

  .site-nav__link::after {
    content: "";
    position: absolute;
    left: 12px;
    right: 12px;
    bottom: 2px;
    height: 1px;
    background: var(--lime-400);
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 180ms var(--ease-out);
  }

  .site-nav__link:hover { background: transparent; border-left-color: transparent; }
  .site-nav__link:hover::after { transform: scaleX(1); }
  .site-nav__link:hover { color: var(--lime-200); }

  .site-nav__link[aria-current="page"] {
    color: var(--lime-400);
    background: transparent;
    border-left-color: transparent;
    border-bottom-color: var(--lime-400);
  }

  .site-nav__link[aria-current="page"]::after { transform: scaleX(1); }
}

@media (max-width: 519px) {
  .brand__tagline { display: none; }
  .header-cta--ghost { display: none; }
  .site-header__inner { min-height: var(--header-h-compact); padding-block: 10px; }
}

/* ---------- index rail ---------- */
.rail {
  position: relative;
  display: none;
}

.rail__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--mist-dim);
  margin-bottom: var(--space-s);
}

.rail__list {
  position: relative;
  border-left: 1px solid var(--line-600);
  padding-left: var(--space-s);
  display: grid;
  gap: 2px;
}

.rail__indicator {
  position: absolute;
  left: -1px;
  top: 0;
  width: 2px;
  height: 18px;
  background: var(--lime-400);
  transition: transform var(--dur-mid) var(--ease-out);
}

.rail__item { display: block; }

.rail__link {
  display: block;
  padding: 7px 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--mist-dim);
  transition: color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}

.rail__link:hover { color: var(--lime-200); transform: translateX(3px); }

.rail__link.is-active {
  color: var(--lime-400);
}

@media (min-width: 1100px) {
  .rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + var(--space-l));
    align-self: start;
  }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  cursor: pointer;
  text-align: center;
  transition: background-color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
}

.btn--primary {
  background: var(--lime-400);
  border-color: var(--lime-400);
  color: var(--ink-900);
}

.btn--primary:hover {
  background: var(--lime-200);
  border-color: var(--lime-200);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--mist-100);
}

.btn--ghost:hover {
  border-color: var(--lime-400);
  color: var(--lime-200);
  transform: translateY(-1px);
}

.btn--quiet {
  background: var(--charcoal-800);
  border-color: var(--line-600);
  color: var(--mist-dim);
}

.btn--quiet:hover {
  border-color: var(--slate-500);
  color: var(--mist-100);
}

/* ---------- breadcrumbs ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: var(--space-m);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--mist-dim);
  border-bottom: 1px solid var(--line-600);
}

.breadcrumbs__item { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumbs__item:not(:last-child)::after {
  content: "/";
  color: var(--line-600);
}

.breadcrumbs a:hover { color: var(--lime-200); }

.breadcrumbs [aria-current="page"] { color: var(--lime-400); }

/* ---------- typography utilities ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--slate-500);
}

.eyebrow::before {
  content: "";
  width: 16px;
  height: 1px;
  background: currentColor;
}

.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  line-height: 1.72;
  color: var(--mist-dim);
}

.rule {
  height: 1px;
  border: 0;
  background: var(--line-600);
  margin-block: var(--space-l);
}

/* ---------- grid ---------- */
.grid {
  display: grid;
  gap: var(--space-m);
}

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

.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

@media (max-width: 899px) {
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-4, .col-6, .col-8 { grid-column: span 6; }
}

@media (max-width: 599px) {
  .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .col-4, .col-6, .col-8, .col-12 { grid-column: span 1; }
}

/* ---------- panel ---------- */
.panel {
  position: relative;
  background: var(--charcoal-800);
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  padding: var(--space-m);
  box-shadow: var(--shadow-1);
  transition: border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
}

.panel:hover,
.panel:focus-within {
  border-color: var(--lime-400);
  transform: translateY(-1px);
  box-shadow: 0 1px 0 rgba(198, 255, 61, 0.09), 0 18px 34px -22px rgba(0, 0, 0, 0.95);
}

.panel--forest { background: var(--forest-700); border-color: #1B4A3D; }

/* ---------- research board ---------- */
.board {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-s) var(--space-m);
  padding-block: var(--space-l);
  border-top: 1px solid var(--line-600);
}

.board__index {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--lime-400);
  padding-top: 6px;
}

.board__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 300;
  letter-spacing: 0.01em;
}

.board__summary {
  grid-column: 2;
  color: var(--mist-dim);
  max-width: 64ch;
}

.board__evidence {
  grid-column: 2;
  margin-top: var(--space-s);
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  background: rgba(21, 24, 26, 0.6);
  padding: var(--space-m);
}

@media (max-width: 599px) {
  .board { grid-template-columns: 1fr; }
  .board__index { padding-top: 0; }
  .board__summary,
  .board__evidence { grid-column: 1; }
}

/* ---------- data figure ---------- */
.data-figure { display: grid; gap: 4px; }

.data-figure__value {
  font-family: var(--font-mono);
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime-400);
  font-variant-numeric: tabular-nums;
}

.data-figure__unit {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--lime-200);
  margin-left: 6px;
  letter-spacing: 0.08em;
}

.data-figure__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--mist-dim);
}

.data-figure--orange .data-figure__value { color: var(--orange-500); }
.data-figure--orange .data-figure__unit { color: #FFB183; }
.data-figure--slate .data-figure__value { color: var(--slate-500); }

/* ---------- tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line-600);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist-dim);
  background: transparent;
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              background-color var(--dur-fast) var(--ease-out);
}

.tag--lime { color: var(--lime-400); border-color: rgba(198, 255, 61, 0.42); }
.tag--orange { color: var(--orange-500); border-color: rgba(255, 122, 47, 0.42); }
.tag--slate { color: var(--slate-500); border-color: rgba(110, 140, 160, 0.42); }

.tag:hover { color: var(--lime-200); border-color: var(--lime-400); }

.tag.is-active {
  background: var(--lime-400);
  border-color: var(--lime-400);
  color: var(--ink-900);
}

/* ---------- stat strip ---------- */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  background: linear-gradient(135deg, rgba(18, 53, 44, 0.55), rgba(21, 24, 26, 0.9) 62%);
  overflow: hidden;
}

.stat-strip__cell {
  padding: var(--space-m);
  border-right: 1px solid var(--line-600);
}

.stat-strip__cell:last-child { border-right: 0; }

.stat-strip__cell .data-figure__value { font-size: clamp(1.9rem, 3.4vw, 2.6rem); }

@media (max-width: 599px) {
  .stat-strip__cell { border-right: 0; border-bottom: 1px solid var(--line-600); }
  .stat-strip__cell:last-child { border-bottom: 0; }
}

/* ---------- note ---------- */
.note {
  border-left: 2px solid var(--slate-500);
  padding: 4px 0 4px var(--space-m);
  color: var(--mist-dim);
  font-size: 15px;
  line-height: 1.8;
}

.note strong { color: var(--lime-200); }

/* ---------- inline status ---------- */
.inline-status {
  display: none;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  padding: 8px 12px;
  border: 1px solid rgba(198, 255, 61, 0.4);
  border-radius: var(--radius-m);
  background: rgba(198, 255, 61, 0.07);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--lime-200);
}

.inline-status[data-visible] { display: inline-flex; }

/* ---------- media frame ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line-600);
  border-radius: var(--radius-m);
  background:
    linear-gradient(160deg, rgba(18, 53, 44, 0.85), rgba(11, 20, 18, 0.96) 58%),
    var(--charcoal-800);
  isolation: isolate;
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(198, 255, 61, 0.07) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(0deg, rgba(110, 140, 160, 0.07) 0 1px, transparent 1px 44px);
  pointer-events: none;
  z-index: 1;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(198, 255, 61, 0.18);
  border-radius: 2px;
  pointer-events: none;
  z-index: 1;
}

.media-frame__inner {
  position: relative;
  z-index: 0;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.media-frame--wide .media-frame__inner { aspect-ratio: 21 / 9; }
.media-frame--tall .media-frame__inner { aspect-ratio: 4 / 5; }
.media-frame--square .media-frame__inner { aspect-ratio: 1 / 1; }

/* ---------- to top ---------- */
.to-top {
  position: fixed;
  right: var(--space-m);
  bottom: var(--space-m);
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--line-600);
  border-radius: 999px;
  background: rgba(21, 24, 26, 0.94);
  color: var(--mist-dim);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--dur-mid) var(--ease-out),
              transform var(--dur-mid) var(--ease-out),
              visibility var(--dur-mid),
              border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover { border-color: var(--lime-400); color: var(--lime-400); }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line-600);
  background:
    radial-gradient(900px 380px at 82% 0%, rgba(18, 53, 44, 0.6), transparent 68%),
    var(--ink-raise);
  color: var(--mist-dim);
  padding-block: var(--space-xl) var(--space-l);
  margin-top: var(--space-xl);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-l) var(--space-m);
}

.footer-col { min-width: 0; }

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--slate-500);
  margin-bottom: var(--space-s);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-600);
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--mist-100);
  margin-bottom: var(--space-s);
}

.footer-note {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist-dim);
  max-width: 34ch;
  margin-bottom: var(--space-s);
}

.footer-icp {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--slate-500);
}

.footer-list { display: grid; gap: 8px; }

.footer-link {
  position: relative;
  display: inline-block;
  font-size: 14.5px;
  color: var(--mist-dim);
  overflow-wrap: anywhere;
  transition: color var(--dur-fast) var(--ease-out);
}

.footer-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: var(--lime-400);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 180ms var(--ease-out);
}

.footer-link:hover { color: var(--lime-200); }
.footer-link:hover::after { transform: scaleX(1); }

.footer-text {
  font-size: 14px;
  color: var(--mist-dim);
  overflow-wrap: anywhere;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-s);
  margin-top: var(--space-l);
  padding-top: var(--space-m);
  border-top: 1px solid var(--line-600);
}

.footer-meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--slate-500);
  max-width: none;
}

@media (min-width: 640px) {
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 960px) {
  .site-footer__grid {
    grid-template-columns: 1.4fr 1fr 1.2fr 1fr;
    gap: var(--space-l);
  }
  .footer-col--brand { padding-right: var(--space-m); }
}

/* ---------- reduced motion ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .panel:hover,
  .panel:focus-within,
  .btn:hover { transform: none; }
}