/* ============================================================
   /assets/site.css — 爱博国游艺 共享样式
   夜间档案室 × 霓虹游艺厅 / 深海蓝底 + 荧光青 + 琥珀金
   ============================================================ */

/* ---------- 01 Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

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

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

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

button { font: inherit; color: inherit; }

main { display: block; }

/* ---------- 02 Tokens ---------- */
:root {
  --ink-900: #061A2B;
  --ink-800: #0A2540;
  --ink-700: #123A5A;
  --cyan: #22E6D2;
  --cyan-soft: rgba(34, 230, 210, 0.12);
  --amber: #FFB43A;
  --wine: #7A1F3D;
  --indigo: #3B2F7A;
  --mist: #F4F7F5;
  --steel: #8FA6B2;
  --text-soft: #C9D7DB;
  --coral: #FF6B6B;
  --green: #3DDC97;

  --shadow-hard: 6px 6px 0 #04121D;
  --shadow-hard-sm: 3px 3px 0 #04121D;
  --border-hard: 2px solid var(--ink-700);

  --r-sm: 4px;
  --r-md: 8px;
  --r-pill: 999px;

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

  --shell-max: 1280px;
  --rail: 260px;
  --header-h: 78px;
  --gutter: clamp(16px, 4vw, 40px);
}

/* ---------- 03 Base typography ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 80% at 88% -12%, rgba(34, 230, 210, 0.13), transparent 58%),
    radial-gradient(90% 70% at -10% 108%, rgba(255, 180, 58, 0.09), transparent 60%),
    radial-gradient(70% 60% at 50% 130%, rgba(59, 47, 122, 0.24), transparent 70%);
  background-repeat: no-repeat;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

h1 { font-size: clamp(40px, 7vw, 96px); }
h2 { font-size: clamp(28px, 4vw, 48px); }
h3 { font-size: clamp(20px, 2.4vw, 28px); line-height: 1.2; }

p { max-width: 38em; }

strong, b { font-weight: 800; color: #FFFFFF; }

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color 0.16s ease;
}

a:hover { color: var(--amber); }

#main-content { scroll-margin-top: calc(var(--header-h) + 16px); }

:where(a, button, summary, input, [tabindex]):focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

/* ---------- 04 Utilities ---------- */
.mono {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

.annotation {
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
}

.annotation--rotated {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.34em;
  transform: rotate(180deg);
}

.link-scan {
  display: inline-block;
  color: var(--mist);
  text-decoration: none;
  background-image: linear-gradient(var(--cyan), var(--cyan));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 2px;
  transition: background-size 0.22s ease, color 0.22s ease;
}

.link-scan:hover,
.link-scan:focus-visible {
  color: var(--cyan);
  background-size: 100% 2px;
}

/* ---------- 05 Skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  transform: translateY(-180%);
  padding: 10px 18px;
  border-radius: var(--r-sm);
  background: var(--cyan);
  color: var(--ink-900);
  font-weight: 800;
  font-size: 14px;
  text-decoration: none;
  box-shadow: var(--shadow-hard-sm);
  transition: transform 0.18s ease;
}

.skip-link:focus-visible {
  transform: translateY(0);
  color: var(--ink-900);
}

/* ---------- 06 Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 10px var(--gutter) 8px;
  background: linear-gradient(180deg, rgba(6, 26, 43, 0.86), rgba(6, 26, 43, 0.38));
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.site-header[data-scrolled] {
  background: linear-gradient(180deg, rgba(6, 26, 43, 0.97), rgba(10, 37, 64, 0.95));
  border-bottom-color: var(--ink-700);
  box-shadow: 0 6px 0 -4px rgba(34, 230, 210, 0.16);
}

.header-rail {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
}

/* 品牌胶囊 */
.brand-capsule {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 14px 7px 7px;
  border: var(--border-hard);
  border-radius: var(--r-pill);
  background: var(--ink-800);
  color: var(--mist);
  text-decoration: none;
  flex: 0 0 auto;
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.brand-capsule:hover,
.brand-capsule:focus-visible {
  color: var(--mist);
  border-color: var(--cyan);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard-sm);
}

.brand-capsule__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: var(--r-sm);
  background: var(--cyan);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
}

.brand-capsule__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.05;
}

.brand-capsule__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: 0.02em;
}

.brand-capsule__sub {
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--steel);
  text-transform: uppercase;
}

.brand-capsule__tag {
  padding-left: 10px;
  border-left: 1px solid var(--ink-700);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--amber);
}

/* 栏目胶囊 */
.nav-capsule {
  display: flex;
  align-items: center;
  margin-inline: auto;
  padding: 5px;
  border: var(--border-hard);
  border-radius: var(--r-pill);
  background: rgba(10, 37, 64, 0.92);
}

.nav-capsule__list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-capsule__item { display: block; }

.nav-capsule__link {
  display: block;
  padding: 8px 14px;
  border: 1.5px solid transparent;
  border-radius: var(--r-pill);
  color: var(--mist);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.16s ease, background 0.16s ease, border-color 0.16s ease;
}

.nav-capsule__link:hover,
.nav-capsule__link:focus-visible {
  color: var(--cyan);
  background: var(--cyan-soft);
  border-color: rgba(34, 230, 210, 0.45);
}

.nav-capsule__link[aria-current="page"] {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 2px rgba(34, 230, 210, 0.22);
}

.nav-capsule__link[aria-current="page"]:hover {
  color: var(--ink-900);
  background: var(--amber);
  border-color: var(--amber);
}

/* 行动舱 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 14px;
  border: var(--border-hard);
  border-radius: var(--r-pill);
  background: var(--ink-800);
  color: var(--mist);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color 0.16s ease, color 0.16s ease, background 0.16s ease;
}

.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle__text { line-height: 1; }

/* 进度细线 */
.header-progress {
  width: 100%;
  max-width: var(--shell-max);
  height: 2px;
  margin: 9px auto 0;
  border-radius: 2px;
  background: rgba(18, 58, 90, 0.75);
  overflow: hidden;
}

.header-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}

/* ---------- 07 Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 2px solid var(--ink-700);
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.03em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease,
    background 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}

.btn:hover,
.btn:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard-sm);
}

.btn:active {
  transform: translate(0, 0);
  box-shadow: none;
}

.btn--solid {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

.btn--solid:hover,
.btn--solid:focus-visible {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--ink-900);
}

.btn--ghost {
  background: rgba(10, 37, 64, 0.7);
  color: var(--mist);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-soft);
}

.btn--amber {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--ink-900);
}

.btn--amber:hover,
.btn--amber:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

.btn--sm {
  padding: 8px 15px;
  font-size: 13px;
}

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

/* ---------- 08 Tags / chips / badges ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--ink-700);
  border-radius: var(--r-pill);
  background: rgba(18, 58, 90, 0.55);
  color: var(--mist);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.tag--cyan { background: var(--cyan); border-color: var(--cyan); color: var(--ink-900); }
.tag--amber { background: var(--amber); border-color: var(--amber); color: var(--ink-900); }
.tag--wine { background: var(--wine); border-color: #9C2B50; color: #FFE9F0; }
.tag--indigo { background: var(--indigo); border-color: #5548A8; color: #EEEBFF; }
.tag--green { background: rgba(61, 220, 151, 0.16); border-color: var(--green); color: var(--green); }
.tag--coral { background: rgba(255, 107, 107, 0.14); border-color: var(--coral); color: var(--coral); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border: 2px solid var(--ink-700);
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--mist);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.16s ease, border-color 0.16s ease, color 0.16s ease;
}

.chip:hover,
.chip:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.chip[aria-pressed="true"],
.chip.is-active {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--ink-900);
}

/* ---------- 09 Layout shells ---------- */
.container {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 820px; }

.page-shell {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(20px, 3vw, 48px);
  align-items: start;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--stack-gap, 16px);
}

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.grid {
  display: grid;
  gap: var(--grid-gap, clamp(16px, 2vw, 24px));
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* 左侧索引轨道 */
.index-rail {
  position: sticky;
  top: calc(var(--header-h) + 18px);
  padding-left: 16px;
  border-left: 2px solid var(--ink-700);
}

.index-rail__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--amber);
}

.index-rail__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.index-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: var(--r-sm);
  color: var(--steel);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.16s ease, background 0.16s ease, border-color 0.16s ease;
}

.index-rail__link:hover,
.index-rail__link:focus-visible {
  color: var(--mist);
  border-color: var(--ink-700);
  background: var(--cyan-soft);
}

.index-rail__link[aria-current="true"] {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.index-rail__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  opacity: 0.75;
}

/* 面包屑 */
.breadcrumbs { padding: 18px 0 0; }

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.breadcrumbs__link { color: var(--steel); text-decoration: none; }
.breadcrumbs__link:hover,
.breadcrumbs__link:focus-visible { color: var(--cyan); }
.breadcrumbs__sep { color: var(--ink-700); }
.breadcrumbs__current { color: var(--mist); }

/* 数字统计 */
.stat { display: flex; flex-direction: column; gap: 2px; }

.stat__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 36px);
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.stat__label {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

/* ---------- 10 Cards ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(16px, 2vw, 24px);
  border: var(--border-hard);
  border-radius: var(--r-md);
  background: var(--ink-800);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.card:hover,
.card:focus-within {
  border-color: var(--cyan);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}

.card__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed rgba(18, 58, 90, 0.9);
}

.card__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(18px, 1.8vw, 22px);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--steel);
  white-space: nowrap;
}

.card__body {
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.7;
}

.card__status {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  padding-top: 10px;
  border-top: 2px solid var(--ink-700);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--steel);
}

.card__status::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--green);
  flex: 0 0 auto;
}

.card__status--live::before { background: var(--cyan); }
.card__status--amber::before { background: var(--amber); }
.card__status--warn::before { background: var(--coral); }

/* ---------- 11 专题研究板 ---------- */
.board {
  display: grid;
  border: var(--border-hard);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(10, 37, 64, 0.96), rgba(6, 26, 43, 0.96));
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.board__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 13px 20px;
  background: var(--indigo);
  border-bottom: 2px solid var(--ink-700);
}

.board__label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: #E2DDFF;
}

.board__body {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.board__part {
  padding: 18px 20px;
  border-top: 1px solid rgba(18, 58, 90, 0.7);
}

.board__part-title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}

.board__summary {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-soft);
}

.board__terms {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.board__more {
  margin-top: 12px;
  font-size: 13px;
  font-weight: 700;
}

/* ---------- 12 折叠面板 ---------- */
.accordion {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.accordion__item {
  border: var(--border-hard);
  border-radius: var(--r-md);
  background: var(--ink-800);
  overflow: hidden;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.accordion__item[data-expanded] {
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard-sm);
}

.accordion__trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 16px 18px;
  border: 0;
  background: none;
  text-align: left;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 800;
  cursor: pointer;
  transition: color 0.16s ease;
}

.accordion__trigger:hover { color: var(--cyan); }

.accordion__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.accordion__sign {
  position: relative;
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  margin-left: auto;
}

.accordion__sign::before,
.accordion__sign::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: currentColor;
  transform: translate(-50%, -50%);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.accordion__sign::before { width: 14px; height: 2px; }
.accordion__sign::after { width: 2px; height: 14px; }

.accordion__item[data-expanded] .accordion__sign::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.accordion__panel {
  padding: 0 18px 18px;
  color: var(--text-soft);
  font-size: 15px;
  line-height: 1.75;
}

.accordion__panel[hidden] { display: none; }

/* ---------- 13 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: var(--border-hard);
  border-radius: var(--r-md);
  background-color: var(--ink-800);
  background-image: linear-gradient(
    140deg,
    rgba(34, 230, 210, 0.16),
    rgba(59, 47, 122, 0.3) 55%,
    rgba(6, 26, 43, 0.94)
  );
  box-shadow: var(--shadow-hard);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image: linear-gradient(rgba(34, 230, 210, 0.08) 1px, transparent 1px);
  background-size: 100% 6px;
  opacity: 0.5;
}

.media-frame > img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.media-frame__caption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 3;
  padding: 3px 10px;
  border: 1px solid var(--ink-700);
  border-radius: var(--r-pill);
  background: rgba(6, 26, 43, 0.86);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

/* ---------- 14 Reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

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

/* ---------- 15 Footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  padding: clamp(32px, 5vw, 64px) var(--gutter) 20px;
  border-top: 2px solid var(--ink-700);
  background: var(--ink-800);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--cyan) 0%,
    var(--amber) 42%,
    var(--wine) 74%,
    var(--indigo) 100%
  );
  opacity: 0.9;
}

.footer-inner {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
}

.footer-crown {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 22px;
  border-bottom: 2px dashed rgba(18, 58, 90, 0.9);
}

.footer-crown__title {
  margin: 0;
  max-width: 22em;
  font-family: var(--font-head);
  font-size: clamp(22px, 3.6vw, 42px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.footer-crown__dot {
  padding: 0 0.28em;
  color: var(--cyan);
}

.footer-crown__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.1fr 1.5fr 1fr;
  gap: clamp(20px, 4vw, 48px);
  padding: clamp(24px, 4vw, 40px) 0 clamp(20px, 3vw, 32px);
}

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

.footer-col__label {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
}

.footer-col__label::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 2px;
  background: var(--cyan);
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0;
  color: var(--mist);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  background-image: linear-gradient(var(--cyan), var(--cyan));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 2px;
  transition: background-size 0.2s ease, color 0.2s ease;
}

.footer-nav__link::before {
  content: "→";
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--amber);
}

.footer-nav__link:hover,
.footer-nav__link:focus-visible {
  color: var(--cyan);
  background-size: 100% 2px;
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-style: normal;
}

.footer-contact__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 0;
}

.footer-contact__key {
  min-width: 64px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.footer-contact__value {
  color: var(--mist);
  font-size: 15px;
  font-weight: 600;
  word-break: break-word;
}

.footer-contact__value--mono {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-meta__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
}

.footer-meta__key {
  min-width: 64px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.footer-meta__value { color: var(--text-soft); }

.footer-meta__icp {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid rgba(18, 58, 90, 0.85);
  font-size: 12px;
  color: var(--steel);
}

.footer-bottom__copy {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-soft);
}

.footer-bottom__meta {
  margin: 0;
  letter-spacing: 0.06em;
}

.footer-region {
  margin: 0;
  padding: 2px 10px;
  border: 1px solid rgba(255, 180, 58, 0.55);
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--amber);
  white-space: nowrap;
}

/* ---------- 16 Responsive ---------- */
@media (max-width: 1180px) {
  .nav-capsule__link { padding: 8px 10px; font-size: 13px; }
  .brand-capsule__tag { display: none; }
  .header-actions__link { display: none; }
}

@media (max-width: 1024px) {
  .page-shell { grid-template-columns: minmax(0, 1fr); }

  .index-rail {
    position: static;
    top: auto;
    padding: 12px 0 4px;
    border-left: 0;
    border-top: 2px solid var(--ink-700);
  }

  .index-rail__list {
    flex-direction: row;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
  }

  .index-rail__link {
    border: 1px solid var(--ink-700);
    border-radius: var(--r-pill);
    white-space: nowrap;
  }

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

@media (max-width: 900px) {
  :root { --header-h: 68px; --rail: 100%; }

  .site-header { padding: 8px var(--gutter) 6px; }

  .header-actions { display: none; }

  .nav-toggle { display: inline-flex; margin-left: auto; }

  .nav-capsule {
    position: fixed;
    left: var(--gutter);
    right: var(--gutter);
    top: calc(var(--header-h) + 6px);
    z-index: 120;
    flex-direction: column;
    align-items: stretch;
    margin: 0;
    padding: 10px;
    border-radius: var(--r-md);
    background: rgba(10, 37, 64, 0.985);
    box-shadow: var(--shadow-hard);
    max-height: calc(100vh - var(--header-h) - 32px);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
  }

  .nav-capsule__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    width: 100%;
  }

  .nav-capsule__link {
    padding: 13px 14px;
    border-radius: var(--r-md);
    font-size: 15px;
    border-color: rgba(18, 58, 90, 0.9);
  }

  .site-header[data-open] .nav-capsule {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .site-header[data-open] .nav-toggle {
    background: var(--cyan);
    border-color: var(--cyan);
    color: var(--ink-900);
  }

  .site-header[data-open] .nav-toggle__bars span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .site-header[data-open] .nav-toggle__bars span:nth-child(2) {
    opacity: 0;
  }

  .site-header[data-open] .nav-toggle__bars span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }

  .header-progress { margin-top: 7px; }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-col:last-child { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

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

  .brand-capsule__sub { letter-spacing: 0.16em; }

  .footer-crown { flex-direction: column; align-items: flex-start; }

  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 24px; }

  .footer-col:last-child { grid-column: auto; }

  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 8px; }

  .header-progress { display: none; }
}

/* ---------- 17 Motion / print ---------- */
@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 !important;
    transform: none !important;
  }
}

@media print {
  .site-header,
  .site-footer,
  .skip-link { display: none; }

  body { background: #FFFFFF; color: #061A2B; }
}