/* ============================================================
   久赢平台官网 · /assets/site.css
   共享层：reset、变量、中文排版、头部、页脚、通用组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

ul, ol { list-style: none; }

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

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

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

table { border-collapse: collapse; width: 100%; }

hr { border: 0; }

/* ---------- 2. Tokens ---------- */
:root {
  --c-indigo: #0B1B3A;
  --c-panel: #152A5A;
  --c-lake: #0E7C86;
  --c-lake-light: #5FC7C9;
  --c-sunset: #F26A3D;
  --c-sunset-soft: #FFB38A;
  --c-wine: #7A1F3D;
  --c-gray: #A7B0C0;
  --c-warm: #F6F3EE;
  --c-ink: #101418;

  --tx-dark: #DDE4F0;
  --tx-dark-strong: #FFFFFF;
  --tx-muted-dark: #9AA6BC;
  --tx-paper: #1A2030;
  --tx-muted-paper: #5A6376;

  --line-dark: rgba(167, 176, 192, 0.28);
  --line-dark-strong: rgba(167, 176, 192, 0.5);
  --line-paper: rgba(16, 20, 24, 0.16);

  --wrap: 1280px;
  --gutter: clamp(1rem, 4vw, 3rem);
  --gap: clamp(1.25rem, 2.6vw, 2.5rem);
  --status-h: 36px;

  --dur: 200ms;
  --dur-slow: 260ms;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);

  --font-display: "Oswald", "Noto Sans SC", "Source Han Sans SC", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", SFMono-Regular, Consolas, monospace;
}

/* ---------- 3. Base & typography ---------- */
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--c-indigo);
  color: var(--tx-dark);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.8;
  letter-spacing: 0.01em;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.005em;
  color: var(--tx-dark-strong);
}

h1 { font-size: clamp(3rem, 8vw, 7rem); font-weight: 900; line-height: 0.98; }
h2 { font-size: clamp(2rem, 4vw, 3.4rem); }
h3 { font-size: 1.35rem; line-height: 1.4; }
h4 { font-size: 1.05rem; line-height: 1.4; }

p { max-width: 78ch; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.1em;
}

.muted { color: var(--tx-muted-dark); }

:focus-visible {
  outline: 2px solid var(--c-sunset);
  outline-offset: 3px;
}

#main-content { display: block; }

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 200;
  transform: translateY(-140%);
  background-color: var(--c-sunset);
  color: #1B0C04;
  padding: 0.6rem 1.1rem;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  transition: transform var(--dur) var(--ease);
}

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

/* ---------- 5. Layout ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.zone {
  position: relative;
  padding-block: clamp(3rem, 7vw, 6rem);
}

.zone--deep { background-color: var(--c-indigo); }

.zone--panel { background-color: var(--c-panel); }

.zone--paper {
  background-color: var(--c-warm);
  color: var(--tx-paper);
}

.zone--paper :is(h1, h2, h3, h4, h5, h6) { color: var(--c-ink); }
.zone--paper .muted,
.zone--paper .lede { color: var(--tx-muted-paper); }
.zone--paper .mono { color: #3C4658; }

.zone--wine {
  background-color: var(--c-wine);
  color: #F7E7EC;
  padding-block: clamp(1.25rem, 3vw, 2rem);
}

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

.col-12 { grid-column: 1 / -1; }
.col-8 { grid-column: span 8; }
.col-7 { grid-column: span 7; }
.col-6 { grid-column: span 6; }
.col-5 { grid-column: span 5; }
.col-4 { grid-column: span 4; }

.stack { display: grid; gap: var(--gap); }
.stack--tight { gap: 0.85rem; }

.rule {
  height: 1px;
  background-color: var(--line-dark);
}

.zone--paper .rule { background-color: var(--line-paper); }

.ticks {
  height: 10px;
  border-bottom: 1px solid var(--line-dark);
  background-image: repeating-linear-gradient(
    90deg,
    var(--line-dark-strong) 0 1px,
    transparent 1px 18px
  );
}

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.3rem;
  border: 1px solid var(--line-dark-strong);
  color: var(--tx-dark);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  letter-spacing: 0.05em;
  line-height: 1.4;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.btn--primary {
  background-color: var(--c-sunset);
  border-color: var(--c-sunset);
  color: #1B0C04;
  font-weight: 500;
}

.btn--primary:hover {
  background-color: var(--c-sunset-soft);
  border-color: var(--c-sunset-soft);
}

.btn--cyan {
  border-color: var(--c-lake);
  color: var(--c-lake-light);
  background-color: rgba(14, 124, 134, 0.12);
}

.btn--cyan:hover {
  background-color: rgba(14, 124, 134, 0.3);
  color: #FFFFFF;
}

.btn--ghost {
  border-color: var(--line-dark);
  color: var(--tx-dark);
}

.btn--ghost:hover {
  border-color: var(--c-sunset);
  background-color: rgba(242, 106, 61, 0.12);
  color: #FFFFFF;
}

.zone--paper .btn--ghost {
  border-color: var(--line-paper);
  color: var(--c-ink);
}

/* ---------- 7. Panels, stats, tags ---------- */
.panel {
  background-color: var(--c-panel);
  border: 1px solid var(--line-dark);
  padding: clamp(1.1rem, 2vw, 1.75rem);
}

.zone--paper .panel {
  background-color: #FFFFFF;
  border-color: var(--line-paper);
}

.panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--line-dark);
}

.zone--paper .panel__head { border-bottom-color: var(--line-paper); }

.panel__title {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  color: var(--c-gray);
}

.zone--paper .panel__title { color: var(--tx-muted-paper); }

.stat { display: grid; gap: 0.3rem; }

.stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1;
  color: var(--tx-dark-strong);
}

.zone--paper .stat__num { color: var(--c-ink); }

.stat__label {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--tx-muted-dark);
}

.zone--paper .stat__label { color: var(--tx-muted-paper); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.15rem 0.65rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  line-height: 1.6;
}

.tag--live { color: var(--c-sunset); }
.tag--cyan { color: var(--c-lake); }
.tag--wine { color: var(--c-wine); }

.zone--paper .tag--cyan { color: #0A5C64; }

/* ---------- 8. Breadcrumb ---------- */
.breadcrumb { padding-block: 1rem; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--tx-muted-dark);
}

.breadcrumb__item--current { color: var(--c-sunset-soft); }

.zone--paper .breadcrumb__item { color: var(--tx-muted-paper); }
.zone--paper .breadcrumb__item--current { color: #B8401C; }

.breadcrumb__sep {
  color: var(--line-dark-strong);
  font-family: var(--font-mono);
}

.breadcrumb__link {
  color: var(--tx-dark);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.zone--paper .breadcrumb__link { color: var(--c-ink); }

.breadcrumb__link:hover {
  color: var(--c-lake-light);
  border-bottom-color: var(--c-lake-light);
}

/* ---------- 9. Prose ---------- */
.prose {
  max-width: 70ch;
  font-size: 1.0625rem;
  line-height: 1.85;
}

.prose > * + * { margin-top: 1.2em; }

.prose h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  margin-top: 2.2em;
  line-height: 1.25;
}

.prose h3 { margin-top: 1.8em; }

.prose ul { display: grid; gap: 0.6em; }

.prose ul > li {
  position: relative;
  padding-left: 1.4em;
}

.prose ul > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 9px;
  height: 2px;
  background-color: var(--c-lake);
}

.prose a {
  color: var(--c-lake-light);
  border-bottom: 1px solid var(--c-lake);
}

.zone--paper .prose a { color: #0A5C64; border-bottom-color: #0A5C64; }

.prose strong { font-weight: 700; color: var(--tx-dark-strong); }
.zone--paper .prose strong { color: var(--c-ink); }

.prose blockquote {
  border-left: 3px solid var(--c-sunset);
  padding-left: 1.1rem;
  color: var(--tx-muted-dark);
}

.zone--paper .prose blockquote { color: var(--tx-muted-paper); }

.lede {
  font-size: clamp(1.125rem, 1.6vw, 1.375rem);
  line-height: 1.7;
  color: #E9EEF8;
}

/* ---------- 10. Media containers ---------- */
.media {
  position: relative;
  overflow: hidden;
  background-color: var(--c-panel);
  border: 1px solid var(--line-dark);
}

.media > img,
.media > svg,
.media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--3x2 { aspect-ratio: 3 / 2; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

.media__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 0.55rem 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--tx-dark);
  background-image: linear-gradient(180deg, rgba(11, 27, 58, 0) 0%, rgba(11, 27, 58, 0.88) 100%);
}

.media__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(95, 199, 201, 0.16) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(0deg, rgba(95, 199, 201, 0.12) 0 1px, transparent 1px 56px);
}

.zone--paper .media { border-color: var(--line-paper); }

/* ---------- 11. TOC / scrollspy ---------- */
.toc { display: grid; gap: 0.2rem; }

.toc__link {
  display: block;
  padding: 0.45rem 0.7rem;
  border-left: 2px solid var(--line-dark);
  font-size: 0.875rem;
  color: var(--tx-muted-dark);
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.toc__link:hover {
  color: var(--tx-dark-strong);
  border-left-color: var(--c-lake-light);
  background-color: rgba(14, 124, 134, 0.12);
}

.toc__link[aria-current="true"] {
  color: var(--c-sunset);
  border-left-color: var(--c-sunset);
  background-color: rgba(242, 106, 61, 0.1);
}

/* ---------- 12. Reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}

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

/* ============================================================
   13. Header
   ============================================================ */
.site-header {
  position: relative;
  z-index: 80;
  background-color: var(--c-indigo);
}

/* --- status bar --- */
.statusbar {
  position: relative;
  height: var(--status-h);
  border-bottom: 1px solid var(--line-dark);
  background-image: linear-gradient(90deg, rgba(14, 124, 134, 0.24) 0%, rgba(11, 27, 58, 0) 46%);
}

.statusbar__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  height: 100%;
  font-size: 0.8125rem;
}

.statusbar__id {
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  color: var(--c-lake-light);
  white-space: nowrap;
}

.statusbar__meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
  max-width: none;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  color: var(--tx-muted-dark);
  font-size: 0.75rem;
}

.statusbar__ver { color: var(--tx-dark); }

.statusbar__sep {
  width: 1px;
  height: 12px;
  background-color: var(--line-dark-strong);
  flex: 0 0 auto;
}

.statusbar__link {
  color: var(--c-sunset-soft);
  border-bottom: 1px solid rgba(255, 179, 138, 0.45);
  padding-bottom: 1px;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.statusbar__link:hover {
  color: var(--c-sunset);
  border-bottom-color: var(--c-sunset);
}

.statusbar__progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 2px;
  width: 0;
  background-image: linear-gradient(90deg, var(--c-lake-light) 0%, var(--c-sunset) 100%);
  transition: width 120ms linear;
}

/* --- masthead / frame nav --- */
.masthead {
  position: relative;
  border-bottom: 1px solid var(--line-dark);
}

.masthead::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  opacity: 0.35;
  background-image: repeating-linear-gradient(
    90deg,
    var(--c-lake-light) 0 1px,
    transparent 1px 26px
  );
}

.masthead__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--gap);
  min-height: 76px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-block: 0.7rem;
  flex: 0 0 auto;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--c-lake-light);
  color: var(--c-lake-light);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  background-image: repeating-linear-gradient(
    45deg,
    rgba(95, 199, 201, 0.14) 0 4px,
    transparent 4px 9px
  );
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.4rem;
  letter-spacing: 0.06em;
  color: var(--tx-dark-strong);
}

.brand__sub {
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--tx-muted-dark);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  margin-left: auto;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--line-dark-strong);
  color: var(--tx-dark);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav-toggle:hover {
  border-color: var(--c-sunset);
  background-color: rgba(242, 106, 61, 0.12);
}

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background-color: currentColor;
  box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor;
}

.nav-toggle__label {
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
}

.nav {
  display: flex;
  align-items: stretch;
  gap: 1.25rem;
  margin-left: auto;
}

.nav__list {
  display: flex;
  align-items: stretch;
}

.nav__item { display: flex; }

.nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 0.85rem;
  font-size: 0.9375rem;
  color: #E7ECF5;
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.nav__link:hover {
  color: #FFFFFF;
  background-color: rgba(14, 124, 134, 0.2);
  border-bottom-color: var(--c-lake-light);
}

.nav__link[aria-current="page"] {
  color: var(--c-sunset);
  background-color: rgba(242, 106, 61, 0.12);
  border-bottom-color: var(--c-sunset);
}

.nav__idx {
  font-size: 0.625rem;
  color: var(--c-gray);
  transform: translateY(-0.4em);
}

.nav__link[aria-current="page"] .nav__idx { color: var(--c-sunset-soft); }

.nav__search {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.15rem;
  padding-left: 1.2rem;
  border-left: 1px solid var(--line-dark);
}

.nav__search-label {
  font-size: 0.625rem;
  letter-spacing: 0.2em;
  color: var(--c-gray);
}

.nav__search-link {
  width: max-content;
  font-size: 0.9375rem;
  color: var(--c-lake-light);
  border-bottom: 1px solid rgba(95, 199, 201, 0.45);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav__search-link:hover {
  color: #FFFFFF;
  border-bottom-color: var(--c-sunset);
}

/* ============================================================
   14. Footer
   ============================================================ */
.site-footer {
  position: relative;
  background-color: var(--c-indigo);
  color: var(--tx-dark);
  border-top: 1px solid var(--line-dark);
  padding-block: clamp(2rem, 5vw, 3.5rem);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  opacity: 0.55;
  background-image: repeating-linear-gradient(
    90deg,
    var(--c-lake-light) 0 2px,
    transparent 2px 14px
  );
}

.footer__creed {
  max-width: none;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 4vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--tx-dark-strong);
}

.footer__creed .mono {
  font-size: 0.5em;
  color: var(--c-gray);
  letter-spacing: 0.2em;
  margin-right: 0.4rem;
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gap);
  margin-top: 1.6rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--line-dark);
}

.footer__col { min-width: 0; }

.footer__title {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.6875rem;
  letter-spacing: 0.24em;
  color: var(--c-gray);
  margin-bottom: 0.85rem;
}

.footer__list { display: grid; gap: 0.5rem; }

.footer__link {
  color: var(--tx-dark);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer__link:hover {
  color: var(--c-lake-light);
  border-bottom-color: var(--c-lake-light);
}

.footer__meta { display: grid; gap: 0.8rem; }

.footer__meta > li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem;
  font-size: 0.9375rem;
}

.footer__k {
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--c-gray);
  border: 1px solid var(--line-dark);
  padding: 0.1rem 0.45rem;
  min-width: 3.4rem;
  text-align: center;
}

.footer__val {
  color: #E4EAF5;
  font-size: 0.9375rem;
  word-break: break-word;
}

.copy-btn {
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--c-lake-light);
  border: 1px solid rgba(95, 199, 201, 0.5);
  padding: 0.15rem 0.55rem;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.copy-btn:hover {
  background-color: rgba(95, 199, 201, 0.16);
  color: #FFFFFF;
  border-color: var(--c-lake-light);
}

.copy-btn[data-copied] {
  background-color: var(--c-lake-light);
  border-color: var(--c-lake-light);
  color: var(--c-ink);
}

.footer__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line-dark);
  font-size: 0.75rem;
  color: var(--tx-muted-dark);
}

.footer__base p { max-width: none; }

/* ============================================================
   15. Responsive
   ============================================================ */
@media (min-width: 960px) {
  .site-header { position: sticky; top: 0; }
}

@media (max-width: 959px) {
  .nav-toggle { display: inline-flex; }

  .statusbar__meta { display: none; }

  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 70;
    flex-direction: column;
    gap: 0;
    margin-left: 0;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background-color: var(--c-indigo);
    border-top: 1px solid var(--line-dark);
    border-bottom: 1px solid var(--line-dark);
    transition: max-height var(--dur-slow) var(--ease), visibility var(--dur-slow) var(--ease);
  }

  .nav[data-open] {
    max-height: 82vh;
    overflow-y: auto;
    visibility: visible;
  }

  .nav__list { flex-direction: column; }

  .nav__link {
    padding: 0.95rem var(--gutter);
    border-bottom: 1px solid var(--line-dark);
    border-left: 3px solid transparent;
  }

  .nav__link[aria-current="page"] {
    border-bottom-color: var(--line-dark);
    border-left-color: var(--c-sunset);
  }

  .nav__search {
    border-left: 0;
    border-top: 1px solid var(--line-dark);
    padding: 1rem var(--gutter) 1.2rem;
    background-color: var(--c-panel);
  }
}

@media (max-width: 900px) {
  .col-8, .col-7, .col-6, .col-5, .col-4 { grid-column: 1 / -1; }
}

@media (max-width: 860px) {
  .footer__grid { grid-template-columns: 1fr; gap: 1.8rem; }
}

@media (max-width: 560px) {
  .statusbar__id { font-size: 0.6875rem; letter-spacing: 0.1em; }
  .statusbar__link { font-size: 0.6875rem; }
  .masthead__inner { min-height: 66px; }
  .brand__name { font-size: 1.2rem; }
  .brand__sub { display: none; }
  .footer__base { flex-direction: column; }
}

/* ============================================================
   16. 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;
  }

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