/* =========================================================
   启博EPN — 共享样式 /assets/site.css
   ========================================================= */

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

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

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

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

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

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

table { border-collapse: collapse; border-spacing: 0; }

hr { border: 0; border-top: 1px solid var(--line); margin: 28px 0; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #101E38;
  --ink-deep: #0B1730;
  --ink-layer: #1B2E52;
  --slate: #33465E;
  --slate-end: #46596F;
  --signal: #FF7A2F;
  --signal-soft: #FF9055;
  --ember: #E2542A;
  --cream: #F4EFE4;
  --cream-dim: #E4DCCC;
  --silver: #C6CED8;
  --umber: #241E1B;
  --green: #3F8F7A;

  --line: rgba(198, 206, 216, .18);
  --line-strong: rgba(198, 206, 216, .34);
  --silver-85: rgba(198, 206, 216, .85);
  --silver-70: rgba(198, 206, 216, .7);
  --silver-55: rgba(198, 206, 216, .55);

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

  --rail-w: 88px;
  --shell: 1280px;
  --gutter: 24px;

  --radius-s: 3px;
  --radius-m: 6px;
  --ease: cubic-bezier(.2, .6, .3, 1);
}

/* ---------- 3. 基础元素 ---------- */
body {
  margin: 0;
  background: var(--ink);
  color: var(--silver);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--cream);
  text-decoration: none;
  transition: color .16s var(--ease);
}

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

strong, b { font-weight: 700; color: var(--cream); }

code, kbd, samp, time, .mono {
  font-family: var(--font-mono);
  font-size: .92em;
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
}

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

/* ---------- 4. 焦点与跳过链接 ---------- */
:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 2px;
  border-radius: var(--radius-s);
}

.skip-link {
  position: absolute;
  top: -72px;
  left: 10px;
  z-index: 300;
  padding: 11px 20px;
  background: var(--signal);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .04em;
  border-radius: 0 0 var(--radius-s) var(--radius-s);
  transition: top .18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 0;
  color: var(--ink);
  outline-offset: 4px;
}

/* ---------- 5. 布局工具 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.band {
  padding-block: 56px;
  border-bottom: 1px solid var(--line);
}

.band--tight { padding-block: 34px; }

.band--cream {
  background: var(--cream);
  color: var(--umber);
  border-bottom-color: rgba(36, 30, 27, .12);
}

.band--cream a { color: #8A3A16; }
.band--cream a:hover { color: var(--ember); }
.band--cream strong,
.band--cream b { color: var(--umber); }

.band--indigo { background: var(--ink-layer); }

.band--slate {
  background: linear-gradient(155deg, var(--slate) 0%, var(--slate-end) 100%);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 22px;
}

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

.stack > * + * { margin-top: 16px; }

/* ---------- 6. 排版组件 ---------- */
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--signal);
}

.kicker::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--signal);
  flex: none;
}

.section-title {
  margin: 0 0 14px;
  padding-left: 15px;
  border-left: 4px solid var(--signal);
  font-family: var(--font-display);
  font-size: clamp(21px, 2.3vw, 29px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.band--cream .section-title { color: var(--umber); }

.lede {
  max-width: 68ch;
  margin: 0 0 20px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--silver-85);
}

.band--cream .lede { color: #4A423C; }

.prose {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
}

.prose > * + * { margin-top: 1.05em; }

.prose h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--cream);
  letter-spacing: .01em;
}

.band--cream .prose h3 { color: var(--umber); }

.band--cream .prose { color: #3A332E; }

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  font-family: var(--font-sans);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .05em;
  line-height: 1.2;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--radius-s);
  cursor: pointer;
  text-decoration: none;
  transition: background-color .16s var(--ease), color .16s var(--ease),
              border-color .16s var(--ease);
}

.btn--sm { padding: 9px 15px; font-size: 12.5px; }

.btn--signal {
  background: var(--signal);
  color: #23150C;
}

.btn--signal:hover {
  background: var(--signal-soft);
  color: #23150C;
}

.btn--ember {
  background: var(--ember);
  color: #FFFFFF;
}

.btn--ember:hover {
  background: #F26940;
  color: #FFFFFF;
}

.btn--ghost {
  background: transparent;
  color: var(--cream);
  border-color: var(--line-strong);
}

.btn--ghost:hover {
  color: var(--signal);
  border-color: var(--signal);
}

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

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

/* ---------- 8. 展签 / 徽章 / 印章 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--silver);
  background: rgba(51, 70, 94, .55);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  white-space: nowrap;
}

.tag--signal {
  color: var(--ink);
  background: var(--signal);
  border-color: var(--signal);
  font-weight: 600;
}

.tag--ember {
  color: var(--cream);
  background: rgba(226, 84, 42, .9);
  border-color: transparent;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--silver);
  white-space: nowrap;
}

.badge::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--silver);
  flex: none;
}

.badge--online { color: #9FD8C7; }
.badge--online::before {
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(63, 143, 122, .22);
}

.badge--alert { color: #F4B49A; }
.badge--alert::before { background: var(--ember); }

.stamp {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 4px 11px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--cream);
  background: rgba(226, 84, 42, .14);
  border-left: 3px solid var(--ember);
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--silver-55);
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs li + li::before {
  content: "/";
  color: var(--silver-55);
}

.breadcrumbs a { color: var(--silver-85); }
.breadcrumbs a:hover { color: var(--signal); }

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

/* ---------- 10. 数据表 ---------- */
.data-table {
  width: 100%;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--silver);
}

.data-table caption {
  caption-side: top;
  padding: 0 0 12px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--signal);
}

.data-table th,
.data-table td {
  padding: 11px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.data-table thead th {
  background: var(--ink-layer);
  color: var(--cream);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  white-space: nowrap;
  border-bottom-color: var(--line-strong);
}

.data-table tbody tr {
  background: linear-gradient(90deg, rgba(51, 70, 94, .34), rgba(70, 89, 111, .1));
  transition: background-color .16s var(--ease);
}

.data-table tbody tr:hover {
  background: rgba(51, 70, 94, .72);
}

.data-table .mono {
  font-size: 12.5px;
  color: var(--cream);
}

.data-table--sticky thead th {
  position: sticky;
  top: 0;
  z-index: 2;
}

.band--cream .data-table { color: var(--umber); }
.band--cream .data-table th,
.band--cream .data-table td { border-bottom-color: rgba(36, 30, 27, .16); }
.band--cream .data-table tbody tr { background: rgba(36, 30, 27, .03); }
.band--cream .data-table tbody tr:hover { background: rgba(36, 30, 27, .07); }
.band--cream .data-table .mono { color: #6B3B1C; }

/* ---------- 11. 说明牌卡片 ---------- */
.plate {
  position: relative;
  padding: 22px;
  background: rgba(27, 46, 82, .55);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  transition: background-color .18s var(--ease), border-color .18s var(--ease);
}

.plate:hover {
  background: linear-gradient(155deg, rgba(51, 70, 94, .88), rgba(70, 89, 111, .42));
  border-color: rgba(255, 122, 47, .42);
}

.plate__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--signal);
}

.plate__title {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: .01em;
  color: var(--cream);
}

.plate__body {
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--silver-70);
}

.plate__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.band--cream .plate {
  background: rgba(36, 30, 27, .04);
  border-color: rgba(36, 30, 27, .16);
}

.band--cream .plate:hover {
  background: rgba(36, 30, 27, .08);
  border-color: rgba(226, 84, 42, .5);
}

.band--cream .plate__title { color: var(--umber); }
.band--cream .plate__body { color: #4A423C; }

/* ---------- 12. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: linear-gradient(150deg, var(--slate) 0%, var(--slate-end) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}

.media-frame > img,
.media-frame > svg,
.media-frame > picture > img,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  max-width: 100%;
  padding: 7px 13px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--cream);
  background: rgba(16, 30, 56, .84);
  border-top: 1px solid var(--line-strong);
  border-right: 1px solid var(--line-strong);
}

/* ---------- 13. 折叠与矩阵 ---------- */
.matrix {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 14px;
}

.fold__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  padding: 13px 16px;
  background: rgba(27, 46, 82, .6);
  color: var(--cream);
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .04em;
  text-align: left;
  cursor: pointer;
  transition: background-color .18s var(--ease), border-color .18s var(--ease);
}

.fold__trigger:hover {
  background: rgba(51, 70, 94, .72);
  border-color: rgba(255, 122, 47, .5);
}

.fold__mark {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal);
  transition: transform .18s var(--ease);
}

.fold__trigger[aria-expanded="true"] .fold__mark { transform: rotate(45deg); }

.fold__panel {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows .18s var(--ease), opacity .18s var(--ease);
}

.fold__panel > * {
  overflow: hidden;
  min-height: 0;
}

.fold__trigger[aria-expanded="true"] + .fold__panel {
  grid-template-rows: 1fr;
  opacity: 1;
}

/* ---------- 14. 页头 ---------- */
.site-header {
  position: relative;
  background: var(--ink);
  border-bottom: 1px solid var(--line-strong);
}

/* 品牌轨道 */
.brand-rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding: 20px 0 22px;
  background: linear-gradient(180deg, var(--ink-deep) 0%, var(--ink) 42%, #16274A 100%);
  border-right: 1px solid var(--line);
}

.brand-rail::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, transparent, rgba(255, 122, 47, .38) 34%, transparent 88%);
  pointer-events: none;
}

.brand-rail__node {
  width: 9px;
  height: 9px;
  flex: none;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, .14);
}

.brand-rail__mark {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .3em;
  color: var(--cream);
}

.brand-rail__region {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--silver-85);
  transition: color .2s var(--ease);
}

.brand-rail__region.is-updated { color: var(--signal); }

.brand-rail__batch {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--silver-55);
}

/* 刊头 */
.header-body { position: relative; }

.masthead {
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 30px var(--gutter) 16px;
}

.masthead__rule {
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong));
}

.masthead__rule--end {
  background: linear-gradient(270deg, transparent, var(--line-strong));
}

.masthead__core {
  flex: 0 0 auto;
  text-align: center;
}

.masthead__brand {
  font-family: var(--font-display);
  font-size: clamp(30px, 4.6vw, 50px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.masthead__kicker {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--silver-70);
}

/* 栏目带 */
.header-bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding: 10px var(--gutter);
  background: rgba(27, 46, 82, .38);
  border-top: 1px solid var(--line);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  justify-self: start;
  padding: 9px 14px;
  background: transparent;
  color: var(--cream);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-s);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .08em;
  cursor: pointer;
  transition: border-color .16s var(--ease), color .16s var(--ease);
}

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

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: var(--signal);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--signal);
  transition: transform .18s var(--ease), opacity .18s var(--ease);
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.primary-nav { justify-self: center; }

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

.primary-nav__item { flex: none; }

.primary-nav__link {
  position: relative;
  display: block;
  padding: 9px 13px;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--silver);
  border-radius: var(--radius-s);
  transition: color .16s var(--ease), background-color .16s var(--ease);
}

.primary-nav__link:hover {
  color: var(--cream);
  background: rgba(255, 122, 47, .12);
}

.primary-nav__link[aria-current="page"] {
  color: var(--cream);
  background: rgba(27, 46, 82, .9);
}

.primary-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 2px;
  height: 2px;
  background: var(--signal);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  justify-self: end;
}

.header-tel {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--silver);
  white-space: nowrap;
}

.header-tel::before {
  content: "TEL";
  margin-right: 8px;
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--signal);
}

/* ---------- 15. 页脚 ---------- */
.site-footer {
  background: linear-gradient(180deg, var(--ink-deep) 0%, #0A142A 100%);
  border-top: 1px solid var(--line-strong);
  color: var(--silver);
  font-size: 14px;
}

.footer-inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 42px var(--gutter) 30px;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 28px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.footer-blurb {
  flex: 1 1 320px;
  max-width: 64ch;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--silver-70);
}

.footer-stamp {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--silver-55);
  white-space: nowrap;
}

.footer-mid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 28px 44px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.footer-label {
  margin-bottom: 13px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--signal);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 24px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-links a {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 13.5px;
  color: var(--silver);
  border-bottom: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.footer-links a:hover {
  color: var(--cream);
  border-bottom-color: var(--signal);
}

.footer-note {
  max-width: 42ch;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--silver-55);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 26px;
  padding-top: 20px;
  font-size: 12.5px;
  color: var(--silver-70);
}

.footer-legal { white-space: nowrap; }
.footer-legal .mono { color: var(--cream); }

/* ---------- 16. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 80;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: rgba(27, 46, 82, .95);
  color: var(--cream);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-s);
  font-family: var(--font-mono);
  font-size: 15px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s var(--ease), background-color .16s var(--ease), color .16s var(--ease);
}

.to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.to-top:hover {
  background: var(--signal);
  color: var(--ink);
  border-color: var(--signal);
}

/* ---------- 17. 桌面侧边轨道 ---------- */
@media (min-width: 1080px) {
  body { padding-left: var(--rail-w); }

  .brand-rail {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 90;
    width: var(--rail-w);
  }
}

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1079px) {
  .brand-rail {
    position: static;
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 14px;
    width: 100%;
    padding: 9px var(--gutter);
    background: linear-gradient(90deg, var(--ink-deep) 0%, var(--ink) 62%, #16274A 100%);
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .brand-rail::after { display: none; }

  .brand-rail__mark,
  .brand-rail__region,
  .brand-rail__batch {
    writing-mode: horizontal-tb;
    text-orientation: initial;
  }

  .brand-rail__mark { font-size: 13px; letter-spacing: .18em; }
  .brand-rail__region { font-size: 11px; }
  .brand-rail__batch { margin-top: 0; margin-left: auto; letter-spacing: .16em; }

  .header-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 14px;
    padding: 10px var(--gutter);
  }

  .nav-toggle { display: inline-flex; flex: none; }

  .primary-nav {
    order: 3;
    flex: 1 1 100%;
    width: 100%;
    display: none;
    margin: 0;
  }

  .primary-nav[data-open] {
    display: block;
    padding-top: 10px;
    border-top: 1px solid var(--line);
  }

  .primary-nav__list {
    flex-wrap: nowrap;
    gap: 6px;
    padding-bottom: 6px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
  }

  .primary-nav__link { padding: 8px 12px; white-space: nowrap; }

  .header-actions { margin-left: auto; }
}

@media (max-width: 900px) {
  .grid-12 { gap: 16px; }

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

  .band { padding-block: 42px; }
}

@media (max-width: 860px) {
  .header-tel { display: none; }
}

@media (max-width: 620px) {
  :root { --gutter: 16px; }

  .masthead { gap: 14px; padding-top: 22px; }
  .masthead__rule { display: none; }
  .masthead__kicker { letter-spacing: .16em; }

  .header-bar { padding: 9px var(--gutter); }
  .btn--sm { padding: 8px 12px; font-size: 12px; }

  .band { padding-block: 34px; }

  .footer-mid { grid-template-columns: 1fr; gap: 24px; }
  .footer-blurb { flex-basis: 100%; }
  .to-top { right: 14px; bottom: 14px; width: 40px; height: 40px; }
}

/* ---------- 19. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .brand-rail__region.is-updated { color: var(--silver-85); }
}