/* ============================================================
   亿博主页 · 共享样式 /assets/site.css
   夜航仪表盘：赣江夜蓝底 + 钨金橙标记 + 等宽索引
   ============================================================ */

/* ---------- 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;
  padding: 0;
}

ul, ol { list-style: none; }

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

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

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

/* ---------- tokens ---------- */
:root {
  --ink-900: #061728;   /* 赣江夜蓝 */
  --ink-800: #0A2239;   /* 深潜蓝 */
  --ink-700: #0E2C47;   /* 仪表蓝 */
  --ink-600: #123A5A;   /* 航道蓝 */
  --line: #6B8799;      /* 青灰 */
  --paper: #F4F7F5;     /* 瓷白 */
  --amber: #F2A33A;     /* 钨金橙 */
  --amber-hi: #FFC46B;  /* 高光橙 */
  --mist: #A9BFCB;      /* 雾青 */

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

  --wrap: 1200px;
  --gutter: clamp(18px, 4vw, 44px);

  --chamfer: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  --chamfer-sm: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));

  --t-fast: 180ms;
  --t-mid: 320ms;
  --t-slow: 520ms;
}

/* ---------- base ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: clamp(15.5px, 0.45vw + 14.2px, 17.5px);
  line-height: 1.75;
  color: var(--mist);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(1100px 620px at 82% -12%, rgba(18, 58, 90, 0.55), transparent 70%),
    radial-gradient(820px 520px at 4% 6%, rgba(14, 44, 71, 0.55), transparent 72%),
    repeating-linear-gradient(0deg, rgba(107, 135, 153, 0.075) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, rgba(107, 135, 153, 0.055) 0 1px, transparent 1px 64px);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  color: var(--paper);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

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

#main-content { scroll-margin-top: 140px; }

/* ---------- focus ---------- */
:focus-visible {
  outline: 2px solid var(--amber-hi);
  outline-offset: 3px;
}

/* 切角元素的外描边会被裁切，改用内阴影 */
.btn:focus-visible,
.card:focus-visible,
.tag:focus-visible,
.skip-link:focus-visible,
.foot-contact:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--amber-hi);
}

/* ---------- helpers ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(40px, 6vw, 88px); }
.section--tight { padding-block: clamp(26px, 4vw, 52px); }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
}

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

.display {
  font-size: clamp(2rem, 4.6vw, 3.6rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.025em;
}

.section-title {
  font-size: clamp(1.35rem, 2.4vw, 2.05rem);
  font-weight: 800;
  letter-spacing: 0.01em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--amber);
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
}

.lede {
  max-width: 66ch;
  color: var(--mist);
}

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, rgba(242, 163, 58, 0.9) 0 72px, rgba(107, 135, 153, 0.28) 72px 100%);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.7em 1.15em;
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  white-space: nowrap;
  color: var(--paper);
  background: rgba(18, 58, 90, 0.6);
  border: 1px solid rgba(169, 191, 203, 0.42);
  clip-path: var(--chamfer-sm);
  transition: background-color var(--t-fast) ease, color var(--t-fast) ease,
              border-color var(--t-fast) ease, transform var(--t-fast) ease;
}

.btn--accent {
  color: #06172a;
  background: linear-gradient(135deg, var(--amber) 0%, #d98a20 100%);
  border-color: transparent;
}

.btn--ghost {
  color: var(--paper);
  background: transparent;
  border-color: rgba(169, 191, 203, 0.45);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn--accent:hover {
  background: linear-gradient(135deg, var(--amber-hi) 0%, var(--amber) 100%);
}

.btn--ghost:hover {
  color: var(--amber-hi);
  background: rgba(18, 58, 90, 0.7);
  border-color: rgba(242, 163, 58, 0.7);
}

.btn:active { transform: translateY(0); }

/* ---------- tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.3em 0.6em;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--mist);
  background: rgba(18, 58, 90, 0.45);
  border: 1px solid rgba(107, 135, 153, 0.4);
}

.tag--accent {
  color: #06172a;
  font-weight: 700;
  background: var(--amber);
  border-color: transparent;
}

/* ---------- card ---------- */
.card {
  position: relative;
  display: block;
  padding: clamp(18px, 2.4vw, 28px);
  background: linear-gradient(160deg, rgba(14, 44, 71, 0.94), rgba(10, 34, 57, 0.94));
  border: 1px solid rgba(107, 135, 153, 0.28);
  clip-path: var(--chamfer);
  box-shadow: inset 0 0 0 1px rgba(244, 247, 245, 0.04);
  transition: border-color var(--t-fast) ease, transform var(--t-mid) ease;
}

.card:hover {
  border-color: rgba(242, 163, 58, 0.55);
  transform: translateY(-2px);
}

/* ---------- grid ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- breadcrumb ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  padding-block: clamp(14px, 2vw, 22px);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--line);
}

.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.crumbs__item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.crumbs__sep { color: rgba(107, 135, 153, 0.6); }

.crumbs__link { color: var(--mist); transition: color var(--t-fast) ease; }
.crumbs__link:hover { color: var(--amber-hi); }
.crumbs [aria-current="page"] { color: var(--paper); }

/* ---------- media（页面阶段放图） ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background:
    radial-gradient(120% 90% at 18% 0%, rgba(18, 58, 90, 0.92), rgba(6, 23, 40, 0.96) 72%);
  border: 1px solid rgba(107, 135, 153, 0.3);
  clip-path: var(--chamfer);
}

.media > img,
.media > picture,
.media > svg {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    repeating-linear-gradient(0deg, rgba(169, 191, 203, 0.14) 0 1px, transparent 1px 4px),
    repeating-linear-gradient(90deg, rgba(169, 191, 203, 0.1) 0 1px, transparent 1px 4px);
  mix-blend-mode: screen;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }

.media__label {
  position: absolute;
  z-index: 3;
  left: 0;
  bottom: 0;
  padding: 0.4em 0.75em;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  color: var(--mist);
  background: rgba(6, 23, 40, 0.82);
  border-top: 1px solid rgba(107, 135, 153, 0.35);
}

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 0.7em 1.1em;
  font-weight: 800;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: #06172a;
  background: var(--amber-hi);
  clip-path: var(--chamfer-sm);
  transform: translateY(-180%);
  transition: transform var(--t-mid) ease;
}

.skip-link:focus,
.skip-link:focus-visible { transform: none; }

/* ---------- rail（左侧竖排快捷轨） ---------- */
.rail {
  position: fixed;
  z-index: 70;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: 60px;
  padding: 18px 0 20px;
  background: linear-gradient(180deg, rgba(14, 44, 71, 0.96), rgba(6, 23, 40, 0.96));
  border: 1px solid rgba(107, 135, 153, 0.32);
  border-left: 0;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.rail__label {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.34em;
  color: var(--line);
  writing-mode: vertical-rl;
}

.rail__link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 0.3em 0;
  color: var(--mist);
  transition: color var(--t-fast) ease;
}

.rail__idx {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.06em;
  color: var(--line);
  transition: color var(--t-fast) ease;
}

.rail__text {
  writing-mode: vertical-rl;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.2em;
}

.rail__link:hover { color: var(--amber-hi); }
.rail__link:hover .rail__idx { color: var(--amber); }

.rail__pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--amber);
  animation: railPulse 3.4s ease-in-out infinite;
}

@keyframes railPulse {
  0%, 100% { opacity: 0.65; box-shadow: 0 0 0 0 rgba(242, 163, 58, 0.45); }
  50% { opacity: 1; box-shadow: 0 0 0 8px rgba(242, 163, 58, 0); }
}

@media (min-width: 1280px) and (min-height: 720px) {
  .rail { display: flex; }
}

/* ---------- masthead ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(6, 23, 40, 0.86);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  backdrop-filter: blur(14px) saturate(120%);
  border-bottom: 1px solid rgba(107, 135, 153, 0.28);
  transition: background-color var(--t-mid) ease, box-shadow var(--t-mid) ease;
}

.masthead.is-scrolled {
  background: rgba(6, 23, 40, 0.96);
  box-shadow: 0 18px 44px -26px #000;
}

.masthead__bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding-block: 12px;
}

.masthead__util {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.masthead__util--start { justify-self: start; }
.masthead__util--end { justify-self: end; }

.util-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  padding: 0.45em 0.7em;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--mist);
  border: 1px solid rgba(107, 135, 153, 0.36);
  clip-path: var(--chamfer-sm);
  transition: color var(--t-fast) ease, background-color var(--t-fast) ease, border-color var(--t-fast) ease;
}

.util-link__k {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.util-link__v { color: inherit; }

.util-link:hover {
  color: var(--paper);
  background: rgba(18, 58, 90, 0.55);
  border-color: rgba(242, 163, 58, 0.65);
}

.masthead__brand {
  justify-self: center;
  min-width: 0;
  text-align: center;
}

.brand {
  display: grid;
  justify-items: center;
  gap: 3px;
}

.brand__name {
  font-size: clamp(1.3rem, 2.3vw, 1.85rem);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: 0.34em;
  text-indent: 0.34em;
  color: var(--paper);
  transition: color var(--t-fast) ease;
}

.brand:hover .brand__name { color: var(--amber-hi); }

.brand__strap {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.26em;
  color: var(--line);
}

/* ---------- nav toggle ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5em;
  padding: 0.55em 0.7em;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--paper);
  border: 1px solid rgba(107, 135, 153, 0.42);
  clip-path: var(--chamfer-sm);
  transition: color var(--t-fast) ease, border-color var(--t-fast) ease, background-color var(--t-fast) ease;
}

.nav-toggle:hover {
  color: var(--amber-hi);
  border-color: rgba(242, 163, 58, 0.65);
  background: rgba(18, 58, 90, 0.5);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--t-mid) ease, top var(--t-mid) ease;
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { top: 8px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 4px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 4px;
  transform: rotate(-45deg);
}

/* ---------- nav ---------- */
.nav {
  border-top: 1px solid rgba(107, 135, 153, 0.2);
  background: linear-gradient(180deg, rgba(10, 34, 57, 0.5), rgba(6, 23, 40, 0));
}

.nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(4px, 1.6vw, 28px);
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 8px var(--gutter) 10px;
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.45em;
  padding: 0.5em 0.2em;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--mist);
  transition: color var(--t-fast) ease;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0.2em;
  right: 0.2em;
  bottom: 0.16em;
  height: 2px;
  background: var(--amber);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-mid) ease, box-shadow var(--t-mid) ease;
}

.nav__idx {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: var(--line);
  transition: color var(--t-fast) ease;
}

.nav__link:hover { color: var(--paper); }
.nav__link:hover::after { transform: scaleX(1); }

.nav__link[aria-current="page"] { color: var(--paper); }
.nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  box-shadow: 0 0 14px rgba(242, 163, 58, 0.75);
}
.nav__link[aria-current="page"] .nav__idx { color: var(--amber); }

/* ---------- scroll progress ---------- */
.masthead__progress {
  height: 2px;
  overflow: hidden;
  background: rgba(107, 135, 153, 0.18);
}

.masthead__progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--ink-600) 0%, var(--amber) 55%, var(--amber-hi) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 90ms linear;
}

/* ---------- footer ---------- */
.site-foot {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  padding-top: clamp(32px, 4.6vw, 64px);
  background: linear-gradient(180deg, rgba(10, 34, 57, 0.97) 0%, rgba(6, 23, 40, 1) 72%);
  border-top: 1px solid rgba(107, 135, 153, 0.3);
}

.site-foot::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--amber) 0 110px, rgba(107, 135, 153, 0.25) 110px 100%);
}

.site-foot__top {
  display: grid;
  grid-template-columns: minmax(230px, 1fr) minmax(0, 1.9fr) minmax(252px, 1.1fr);
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(28px, 4vw, 48px);
}

.foot-brand {
  display: grid;
  align-content: start;
  justify-items: start;
  gap: 14px;
}

.foot-brand__link {
  font-size: 1.35rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.24em;
  text-indent: 0.24em;
  color: var(--paper);
  transition: color var(--t-fast) ease;
}

.foot-brand__link:hover { color: var(--amber-hi); }

.foot-brand__note {
  font-size: 0.86rem;
  color: var(--mist);
}

.foot-brand__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.foot-tag {
  padding: 0.24em 0.55em;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  color: var(--line);
  border: 1px solid rgba(107, 135, 153, 0.35);
}

.foot-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}

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

.foot-col__title {
  margin-bottom: 12px;
  padding-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--amber);
  border-bottom: 1px solid rgba(107, 135, 153, 0.22);
}

.foot-col__list {
  display: grid;
  gap: 9px;
}

.foot-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-size: 0.9rem;
  color: var(--mist);
  transition: color var(--t-fast) ease;
}

.foot-link::before {
  content: "";
  width: 10px;
  height: 1px;
  background: var(--line);
  transition: width var(--t-fast) ease, background-color var(--t-fast) ease;
}

.foot-link:hover { color: var(--paper); }
.foot-link:hover::before { width: 18px; background: var(--amber); }

.foot-contact {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: clamp(16px, 2vw, 22px);
  background: rgba(14, 44, 71, 0.55);
  border: 1px solid rgba(107, 135, 153, 0.28);
  clip-path: var(--chamfer);
}

.foot-contact .foot-col__title { margin-bottom: 2px; }

.foot-contact__row {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  font-size: 0.86rem;
  line-height: 1.6;
}

.foot-contact__k {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.18em;
  color: var(--line);
}

.foot-contact__v {
  color: var(--paper);
  overflow-wrap: anywhere;
}

.foot-contact__note {
  margin-top: 2px;
  padding-top: 10px;
  font-size: 0.76rem;
  color: var(--mist);
  border-top: 1px dashed rgba(107, 135, 153, 0.32);
}

.foot-base {
  border-top: 1px solid rgba(107, 135, 153, 0.22);
  background: rgba(6, 23, 40, 0.72);
}

.foot-base__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 22px;
  padding-block: 16px;
}

.foot-base__icp,
.foot-base__year {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--line);
}

.foot-base__note {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.foot-base__note::before {
  content: "·";
  color: var(--amber);
  font-size: 1.1em;
  line-height: 1;
}

/* ---------- reveal ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--t-slow) ease, transform var(--t-slow) cubic-bezier(0.22, 0.61, 0.36, 1);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

.has-js [data-reveal].is-in {
  opacity: 1;
  transform: none;
  will-change: auto;
}

/* ---------- responsive ---------- */
@media (max-width: 1024px) {
  .site-foot__top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .foot-brand { grid-column: 1 / -1; }
}

@media (max-width: 960px) {
  .masthead__bar {
    grid-template-columns: 1fr auto auto;
    gap: 10px;
    padding-block: 10px;
  }

  .masthead__util--start { display: none; }

  .masthead__brand {
    justify-self: start;
    text-align: left;
  }

  .brand { justify-items: start; }

  .brand__name {
    font-size: 1.18rem;
    letter-spacing: 0.24em;
    text-indent: 0.24em;
  }

  .brand__strap {
    font-size: 0.56rem;
    letter-spacing: 0.18em;
  }

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

  .btn.btn--accent {
    padding: 0.55em 0.8em;
    font-size: 0.78rem;
    letter-spacing: 0.06em;
  }

  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    background: rgba(6, 23, 40, 0.98);
    border-top: 1px solid rgba(107, 135, 153, 0.26);
    border-bottom: 1px solid rgba(107, 135, 153, 0.3);
    transition: max-height var(--t-mid) ease, opacity var(--t-fast) ease, visibility var(--t-mid) ease;
  }

  .nav[data-open="true"] {
    max-height: min(74vh, 540px);
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px var(--gutter) 22px;
  }

  .nav__item + .nav__item { border-top: 1px solid rgba(107, 135, 153, 0.16); }

  .nav__link {
    width: 100%;
    justify-content: flex-start;
    gap: 0.9em;
    padding: 0.95em 0.4em;
    font-size: 1rem;
    letter-spacing: 0.12em;
  }

  .nav__link::after { display: none; }

  .nav__link[aria-current="page"] {
    color: var(--amber-hi);
    box-shadow: inset 3px 0 0 var(--amber);
  }
}

@media (max-width: 760px) {
  .site-foot__top {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .foot-base__inner { justify-content: flex-start; }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }

  .btn { padding: 0.68em 1em; }

  .foot-contact__row { grid-template-columns: 54px minmax(0, 1fr); }
}

@media (max-width: 420px) {
  .foot-cols { grid-template-columns: minmax(0, 1fr); }
  .nav-toggle__text { display: none; }
}

@media (min-width: 641px) and (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 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;
  }

  .has-js [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .rail__pulse {
    animation: none;
    box-shadow: 0 0 0 3px rgba(242, 163, 58, 0.28);
  }

  .card:hover,
  .btn:hover { transform: none; }
}

/* ---------- print ---------- */
@media print {
  .masthead,
  .rail,
  .site-foot,
  .skip-link { display: none !important; }

  body {
    color: #111;
    background: #fff;
  }

  .card { border-color: #999; }
}