/* =========================================================
   云顶国际 · PC 端帮助中心 — 共享样式 /assets/site.css
   云端档案室：深青蓝底 + 索引式排版 + 侧边轨道导航
   ========================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

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

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

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

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

a { color: inherit; }

[hidden] { display: none !important; }

/* ---------- 2. Tokens ---------- */
:root {
  --c-bg: #071A2B;
  --c-surface: #0E2A42;
  --c-glass: #1B3A55;
  --c-text: #F2F6F9;
  --c-text-2: #C3D0DB;
  --c-border: #7C8FA3;
  --c-accent: #FF8A3D;
  --c-accent-2: #A46BFF;
  --c-online: #23D3C0;
  --c-highlight: #E8EEF4;

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

  --header-h: 72px;
  --rail-w: 88px;
  --rail-w-open: 248px;
  --wrap: 1240px;

  --radius: 14px;
  --radius-sm: 10px;
  --line: 1px solid rgba(124, 143, 163, 0.26);
  --line-soft: 1px solid rgba(124, 143, 163, 0.18);
  --shadow-1: 0 18px 44px rgba(3, 10, 18, 0.45);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

@media (max-width: 1023px) { :root { --header-h: 62px; } }
@media (max-width: 640px)  { :root { --header-h: 58px; } }

/* ---------- 3. Base ---------- */
body {
  min-height: 100vh;
  background-color: var(--c-bg);
  background-image:
    radial-gradient(1100px 520px at 82% -8%, rgba(164, 107, 255, 0.16), transparent 62%),
    radial-gradient(880px 460px at -8% 6%, rgba(35, 211, 192, 0.10), transparent 60%),
    linear-gradient(to right, rgba(124, 143, 163, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(124, 143, 163, 0.045) 1px, transparent 1px);
  background-size: auto, auto, 96px 96px, 96px 96px;
  background-attachment: fixed;
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 16.5px;
  line-height: 1.85;
  letter-spacing: 0.005em;
}

@media (max-width: 768px) {
  body { background-attachment: scroll; }
}

#main-content {
  display: block;
  padding-top: var(--header-h);
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0.01em;
  color: var(--c-text);
  text-wrap: balance;
}

h1 { font-size: clamp(2.2rem, 4.6vw, 3.5rem); font-weight: 900; letter-spacing: -0.012em; }
h2 { font-size: clamp(1.6rem, 2.7vw, 2.375rem); }
h3 { font-size: 1.375rem; font-weight: 700; }
h4 { font-size: 1.0625rem; font-weight: 700; }

p { max-width: 70ch; }
strong { font-weight: 700; color: var(--c-text); }

::selection { background: rgba(255, 138, 61, 0.34); color: #FFFFFF; }

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 4. Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 24px;
}
.container--wide { max-width: 1440px; }
.container--narrow { max-width: 860px; }

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

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

.section { padding-block: 64px; position: relative; }
.section--tight { padding-block: 40px; }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: var(--line-soft);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-online);
}

.lede {
  font-size: 17px;
  line-height: 1.9;
  color: var(--c-text-2);
  max-width: 60ch;
}

.note {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.75;
  letter-spacing: 0.02em;
  color: var(--c-text-2);
  border-left: 2px solid rgba(164, 107, 255, 0.6);
  padding-left: 12px;
  max-width: 40ch;
}

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, rgba(124, 143, 163, 0.4), rgba(124, 143, 163, 0.05));
  margin-block: 32px;
}

.grid { display: grid; gap: 22px; }
.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)); }

.editorial {
  display: grid;
  grid-template-columns: minmax(0, 8fr) minmax(220px, 3fr);
  gap: 40px;
  align-items: start;
}

@media (max-width: 1100px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 1000px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .editorial { grid-template-columns: minmax(0, 1fr); gap: 28px; }
}
@media (max-width: 680px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .container { padding-inline: 18px; }
  .section { padding-block: 46px; }
}

/* ---------- 5. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: rgba(27, 58, 85, 0.78);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 14.5px;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease, transform 180ms ease;
}
.btn:hover { transform: translateY(-1px); }

.btn--primary {
  background: var(--c-accent);
  border-color: rgba(255, 138, 61, 0.7);
  color: #071A2B;
}
.btn--primary:hover { background: #FF9E5E; border-color: #FF9E5E; }

.btn--ghost {
  background: transparent;
  border-color: rgba(195, 208, 219, 0.4);
  color: var(--c-text);
}
.btn--ghost:hover {
  border-color: var(--c-accent);
  color: #FFC79B;
  background: rgba(255, 138, 61, 0.08);
}

.btn--quiet {
  background: transparent;
  border-color: transparent;
  padding: 6px 0;
  color: var(--c-accent);
}
.btn--quiet::after {
  content: "→";
  transition: transform 180ms ease;
}
.btn--quiet:hover::after { transform: translateX(4px); }

.btn--block { width: 100%; }

/* ---------- 6. Cards & tags ---------- */
.card {
  background: var(--c-surface);
  border: var(--line);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: rgba(255, 138, 61, 0.5);
  box-shadow: var(--shadow-1);
}
.card--glass {
  background: rgba(27, 58, 85, 0.45);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: rgba(195, 208, 219, 0.22);
}
.card__title {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 8px;
}
.card__meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--c-text-2);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  background: rgba(164, 107, 255, 0.14);
  border: 1px solid rgba(164, 107, 255, 0.35);
  color: #C9A8FF;
}
.tag--online {
  background: rgba(35, 211, 192, 0.12);
  border-color: rgba(35, 211, 192, 0.35);
  color: var(--c-online);
}
.tag--accent {
  background: rgba(255, 138, 61, 0.14);
  border-color: rgba(255, 138, 61, 0.4);
  color: #FFB481;
}

/* ---------- 7. Breadcrumb ---------- */
.breadcrumb { padding-top: 16px; }
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-text-2);
}
.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-border);
}
.breadcrumb a { text-decoration: none; color: var(--c-text-2); }
.breadcrumb a:hover { color: var(--c-accent); }
.breadcrumb [aria-current="page"] { color: var(--c-text); }

/* ---------- 8. Anchor TOC ---------- */
.toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.toc__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 8px 12px;
  border-radius: 8px;
  border-left: 2px solid transparent;
  text-decoration: none;
  color: var(--c-text-2);
  font-size: 14px;
  transition: background 180ms ease, color 180ms ease, border-color 180ms ease;
}
.toc__link:hover { background: rgba(27, 58, 85, 0.7); color: var(--c-text); }
.toc__link.is-current,
.toc__link[aria-current="true"] {
  color: var(--c-text);
  background: rgba(27, 58, 85, 0.85);
  border-left-color: var(--c-accent);
}
.toc__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--c-accent-2);
}

/* ---------- 9. Dense index list ---------- */
.index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--line-soft);
}
.index-item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  padding: 16px 10px;
  border-bottom: var(--line-soft);
  text-decoration: none;
  color: inherit;
  transition: background 180ms ease, padding-left 180ms ease;
}
.index-item:hover { background: rgba(27, 58, 85, 0.6); padding-left: 16px; }
.index-item__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-accent-2);
  letter-spacing: 0.08em;
}
.index-item__title { font-weight: 600; font-size: 15.5px; }
.index-item__meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--c-text-2);
}
@media (max-width: 620px) {
  .index-item { grid-template-columns: 46px minmax(0, 1fr); }
  .index-item__meta { grid-column: 2; }
}

/* ---------- 10. Accordion (details) ---------- */
.accordion {
  border: var(--line);
  border-radius: 12px;
  background: rgba(14, 42, 66, 0.7);
  overflow: hidden;
}
.accordion + .accordion { margin-top: 10px; }
.accordion__title {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  font-weight: 700;
  font-size: 15.5px;
  list-style: none;
}
.accordion__title::-webkit-details-marker { display: none; }
.accordion__title::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--c-accent);
}
.accordion[open] .accordion__title::after { content: "–"; }
.accordion__body {
  padding: 0 18px 18px;
  color: var(--c-text-2);
  font-size: 15.5px;
}

/* ---------- 11. Media frames ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius);
  border: var(--line);
  background: linear-gradient(160deg, rgba(27, 58, 85, 0.9), rgba(7, 26, 43, 0.95));
}
.media-frame img,
.media-frame video,
.media-frame picture img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3  { aspect-ratio: 4 / 3; }
.media-frame--3x4  { aspect-ratio: 3 / 4; }
.media-frame--1x1  { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    linear-gradient(to right, rgba(195, 208, 219, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(195, 208, 219, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
}
.media-frame__caption {
  position: absolute;
  z-index: 1;
  left: 12px;
  right: 12px;
  bottom: 12px;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(7, 26, 43, 0.72);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--c-text-2);
}
.media-frame__badge { position: absolute; z-index: 1; top: 12px; left: 12px; }

/* ---------- 12. Reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms ease, transform 420ms ease;
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 13. Header ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -70px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: 8px;
  background: var(--c-accent);
  color: #071A2B;
  font-weight: 700;
  text-decoration: none;
  transition: top 160ms ease;
}
.skip-link:focus { top: 12px; }

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 90;
  background: rgba(7, 26, 43, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(124, 143, 163, 0.28);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  height: var(--header-h);
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: 20px;
}

.scroll-progress {
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent-2));
  pointer-events: none;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius-sm);
}
.brand__mark {
  position: relative;
  flex: none;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  overflow: hidden;
  border: 1px solid rgba(195, 208, 219, 0.42);
  background: linear-gradient(150deg, #1B3A55, #071A2B 72%);
}
.brand__mark::before {
  content: "";
  position: absolute;
  inset: 9px 7px;
  background-image: repeating-linear-gradient(
    to bottom,
    rgba(195, 208, 219, 0.55) 0 2px,
    transparent 2px 7px
  );
}
.brand__mark::after {
  content: "";
  position: absolute;
  right: 5px;
  top: 6px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--c-accent);
}
.brand__text { display: block; min-width: 0; }
.brand__name {
  display: block;
  font-family: var(--font-head);
  font-size: 15.5px;
  font-weight: 800;
  letter-spacing: 0.01em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand__meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(195, 208, 219, 0.72);
}

.header-note {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: rgba(195, 208, 219, 0.72);
  white-space: nowrap;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.header-query {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  background: var(--c-accent);
  border: 1px solid rgba(255, 138, 61, 0.7);
  color: #071A2B;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: background 180ms ease;
}
.header-query:hover { background: #FF9E5E; }
.header-query__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #071A2B;
  box-shadow: 0 0 0 3px rgba(7, 26, 43, 0.18);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(124, 143, 163, 0.5);
  background: rgba(27, 58, 85, 0.6);
  color: var(--c-text);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.nav-toggle:hover { border-color: var(--c-accent); }
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}
.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}
.nav-toggle__bars span:last-child { width: 10px; }

/* ---------- 14. Rail navigation (desktop) ---------- */
.rail-nav {
  position: fixed;
  top: var(--header-h);
  left: 0;
  bottom: 0;
  z-index: 60;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 10px 18px;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(14, 42, 66, 0.72), rgba(7, 26, 43, 0.94));
  border-right: 1px solid rgba(124, 143, 163, 0.24);
  transition: width 200ms var(--ease), background 200ms ease, box-shadow 200ms ease;
}
.rail-nav:hover,
.rail-nav:focus-within {
  width: var(--rail-w-open);
  background: linear-gradient(180deg, rgba(27, 58, 85, 0.92), rgba(14, 42, 66, 0.96));
  box-shadow: 24px 0 60px rgba(4, 14, 24, 0.55);
}

.rail-nav__caption {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(195, 208, 219, 0.7);
  padding: 0 12px 10px;
  white-space: nowrap;
}

.rail-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.rail-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--c-text-2);
  text-decoration: none;
  white-space: nowrap;
  transition: background 180ms ease, color 180ms ease;
}
.rail-nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: transparent;
}
.rail-nav__link:hover { background: rgba(27, 58, 85, 0.72); color: var(--c-text); }
.rail-nav__link:hover::before { background: var(--c-accent-2); }
.rail-nav__link[aria-current="page"] {
  background: rgba(27, 58, 85, 0.9);
  color: var(--c-text);
}
.rail-nav__link[aria-current="page"]::before { background: var(--c-accent); }

.rail-nav__idx {
  flex: none;
  width: 22px;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--c-accent-2);
}
.rail-nav__link[aria-current="page"] .rail-nav__idx { color: var(--c-accent); }

.rail-nav__label {
  font-size: 14.5px;
  font-weight: 600;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 180ms ease, transform 180ms ease;
}
.rail-nav:hover .rail-nav__label,
.rail-nav:focus-within .rail-nav__label,
.rail-nav[data-open] .rail-nav__label {
  opacity: 1;
  transform: none;
}

.rail-nav__foot {
  margin-top: auto;
  padding: 14px 12px 4px;
  border-top: 1px dashed rgba(124, 143, 163, 0.3);
  white-space: nowrap;
}
.rail-nav__meta {
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: rgba(195, 208, 219, 0.6);
  margin-bottom: 8px;
}
.rail-nav__mail {
  font-size: 12.5px;
  color: var(--c-text-2);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 138, 61, 0.5);
}
.rail-nav__mail:hover { color: var(--c-accent); }

/* ---------- 15. Nav scrim ---------- */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 70;
  background: rgba(4, 14, 24, 0.62);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
}
.nav-scrim.is-open { opacity: 1; pointer-events: auto; }

/* ---------- 16. Responsive nav ---------- */
@media (max-width: 1023px) {
  .site-header__inner { padding-inline: 16px; gap: 10px; }
  .header-note { display: none; }
  .header-cta { display: none; }
  .brand__meta { display: none; }
  .nav-toggle { display: inline-flex; }

  .rail-nav {
    top: 0;
    bottom: 0;
    width: min(84vw, 320px);
    padding: calc(var(--header-h) + 18px) 16px 24px;
    background: linear-gradient(180deg, #0E2A42, #071A2B);
    border-right: 1px solid rgba(124, 143, 163, 0.35);
    transform: translateX(-102%);
    box-shadow: none;
    z-index: 80;
    transition: transform 240ms var(--ease);
  }
  .rail-nav[data-open] {
    transform: none;
    box-shadow: 28px 0 80px rgba(3, 10, 18, 0.7);
  }
  .rail-nav:hover,
  .rail-nav:focus-within {
    width: min(84vw, 320px);
    box-shadow: none;
  }
  .rail-nav[data-open]:hover,
  .rail-nav[data-open]:focus-within {
    box-shadow: 28px 0 80px rgba(3, 10, 18, 0.7);
  }
  .rail-nav__caption { opacity: 1; }
  .rail-nav__label,
  .rail-nav:hover .rail-nav__label { opacity: 1; transform: none; }
}

@media (min-width: 1024px) {
  .nav-scrim { display: none; }
}

@media (max-width: 520px) {
  .header-query { padding: 8px 11px; font-size: 13px; }
  .nav-toggle__text { display: none; }
}

/* ---------- 17. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: 96px;
  background: linear-gradient(180deg, rgba(14, 42, 66, 0.62), rgba(7, 26, 43, 0.98) 42%);
  border-top: 1px solid rgba(124, 143, 163, 0.28);
}

.footer-band {
  background: rgba(27, 58, 85, 0.55);
  border-bottom: 1px solid rgba(124, 143, 163, 0.24);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.footer-band__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  min-height: 52px;
  max-width: 1440px;
  margin-inline: auto;
  padding: 12px 24px;
}
.footer-band__label {
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-online);
  white-space: nowrap;
}
.footer-band__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-band__link {
  font-size: 13.5px;
  color: var(--c-text-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}
.footer-band__link:hover { color: var(--c-text); border-bottom-color: var(--c-accent); }

.footer-main { border-bottom: 1px solid rgba(124, 143, 163, 0.2); }
.footer-main__inner {
  display: grid;
  grid-template-columns: minmax(260px, 1.05fr) minmax(0, 2fr);
  gap: 48px;
  max-width: 1440px;
  margin-inline: auto;
  padding: 56px 24px 48px;
}

.footer-brand__name {
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.01em;
}
.footer-brand__meta {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: rgba(195, 208, 219, 0.7);
  margin-top: 4px;
}
.footer-brand__note {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--c-text-2);
  max-width: 46ch;
}

.footer-contact {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px dashed rgba(124, 143, 163, 0.3);
}
.footer-contact__row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 12px;
  padding: 6px 0;
}
.footer-contact__key {
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: rgba(195, 208, 219, 0.72);
}
.footer-contact__val {
  font-size: 14px;
  color: var(--c-text);
  margin: 0;
  word-break: break-word;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
}
.footer-col__title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-online);
  padding-bottom: 10px;
  margin-bottom: 6px;
  border-bottom: 1px solid rgba(124, 143, 163, 0.24);
}
.footer-col__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-col__link {
  display: block;
  padding: 5px 0;
  font-size: 14px;
  color: var(--c-text-2);
  text-decoration: none;
  transition: color 180ms ease, padding-left 180ms ease;
}
.footer-col__link:hover { color: var(--c-text); padding-left: 5px; }

.footer-legal {
  background: rgba(7, 26, 43, 0.85);
}
.footer-legal__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  max-width: 1440px;
  margin-inline: auto;
  padding: 18px 24px 24px;
}
.footer-legal__text {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: rgba(195, 208, 219, 0.72);
}
.footer-legal__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-legal__link {
  font-size: 12.5px;
  color: var(--c-text-2);
  text-decoration: none;
  border-bottom: 1px solid rgba(124, 143, 163, 0.4);
}
.footer-legal__link:hover { color: var(--c-accent); border-bottom-color: var(--c-accent); }
.footer-legal__copy {
  font-size: 12.5px;
  color: rgba(195, 208, 219, 0.72);
  margin-left: auto;
}

@media (max-width: 1023px) {
  .footer-main__inner { grid-template-columns: minmax(0, 1fr); gap: 36px; padding: 44px 18px 38px; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
  .footer-band__inner { padding: 12px 18px; }
  .footer-legal__inner { padding: 16px 18px 22px; }
  .footer-legal__copy { margin-left: 0; }
  .site-footer { margin-top: 64px; }
}

@media (max-width: 560px) {
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .footer-contact__row { grid-template-columns: minmax(0, 1fr); gap: 2px; }
}

/* ---------- 18. Motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}