/* =========================================================
   博业体育 · 共享外壳样式  /assets/site.css
   1 重置  2 变量  3 基础排版  4 布局  5 头部  6 页脚
   7 通用组件  8 媒体容器  9 响应式  10 无障碍与动效降级
   ========================================================= */

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

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

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

ul, ol { padding: 0; 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%; }

:focus-visible {
  outline: 2px solid #B4FF3A;
  outline-offset: 2px;
  background-color: rgba(169, 180, 176, 0.14);
}

/* ---------- 2 变量 ---------- */
:root {
  --pitch-900: #0B2A21;
  --teal-800: #0E3A3F;
  --burgundy-700: #5A1A2A;
  --indigo-700: #241E4E;
  --orange: #FF6A2B;
  --volt: #B4FF3A;
  --mist: #A9B4B0;
  --paper: #F3F1E9;
  --ink: #0A1412;
  --brass: #C9A15A;

  --bg: var(--pitch-900);
  --fg: var(--paper);
  --muted: var(--mist);
  --line: rgba(169, 180, 176, 0.26);
  --line-strong: rgba(169, 180, 176, 0.52);

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

  --step--1: 0.8125rem;
  --step-0: 1rem;
  --step-1: 1.25rem;
  --step-2: 1.75rem;

  --gutter: clamp(1rem, 4vw, 3.25rem);
  --shell: 78rem;
  --baseline: 8px;
  --row: 24px;
  --header-h: 4.5rem;
}

/* ---------- 3 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--bg);
  background-image:
    linear-gradient(to right, rgba(169, 180, 176, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(169, 180, 176, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: var(--step-0);
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 { line-height: 1.15; font-weight: 800; letter-spacing: -0.01em; }
h1 { font-size: clamp(2.25rem, 5.4vw, 5rem); letter-spacing: -0.03em; line-height: 0.98; }
h2 { font-size: clamp(1.5rem, 2.6vw, 2.25rem); }
h3 { font-size: var(--step-1); }
h4 { font-size: var(--step-0); }

strong { font-weight: 800; }

code, kbd, samp, .mono { font-family: var(--font-mono); }

::selection { background: var(--orange); color: var(--pitch-900); }

/* ---------- 4 布局 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--row) clamp(1rem, 2vw, 1.5rem);
}

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

/* ---------- 5 头部 ---------- */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: 0;
  z-index: 200;
  padding: 0.625rem 1rem;
  background: var(--volt);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  transform: translateY(-140%);
  transition: transform 0.18s ease;
}

.skip-link:focus { transform: translateY(0.5rem); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(11, 42, 33, 0.97);
  border-bottom: 1px solid var(--line);
}

.site-header[data-scrolled="true"] {
  background: #0A231C;
  border-bottom-color: var(--line-strong);
}

.header-frame {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 0 var(--gutter);
  min-height: var(--header-h);
}

/* 品牌区 */
.brand-block {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  min-width: 0;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2.375rem;
  height: 2.375rem;
  border: 1px solid var(--orange);
  background: linear-gradient(135deg, rgba(255, 106, 43, 0.18), transparent 62%);
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.brand-link:hover .brand-mark { background-color: var(--orange); color: var(--pitch-900); }
.brand-link:hover .brand-name { color: var(--orange); }

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

.brand-name {
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  transition: color 0.18s ease;
}

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.brand-domain {
  padding-left: 0.875rem;
  border-left: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--line-strong);
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
}

.nav-toggle-icon { display: grid; gap: 4px; }

.nav-toggle-bar {
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: transform 0.2s ease;
}

/* 导航区 */
.nav-zone {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.4vw, 2.25rem);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 1.6vw, 1.5rem);
}

.nav-list a {
  position: relative;
  display: block;
  padding: 0.5rem 0.125rem;
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--fg);
  transition: color 0.18s ease;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.125rem;
  height: 1px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s ease;
}

.nav-list a:hover { color: var(--orange); }
.nav-list a:hover::after,
.nav-list a:focus-visible::after { transform: scaleX(1); }

.nav-list a[aria-current="page"] { color: var(--orange); font-weight: 700; }
.nav-list a[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--volt);
}

.nav-tools {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-left: clamp(0.75rem, 1.6vw, 1.5rem);
  border-left: 1px solid var(--line);
}

.tool-link {
  padding: 0.375rem 0.5rem;
  border: 1px solid transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.tool-link:hover { color: var(--fg); border-color: var(--line-strong); }

.tool-cta {
  padding: 0.5rem 0.875rem;
  background: var(--orange);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.tool-cta:hover { background: var(--volt); color: var(--ink); }

/* 遮罩 */
.nav-scrim {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 110;
  background: rgba(10, 20, 18, 0.72);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

/* 坐标标尺 */
.header-rail {
  display: flex;
  align-items: center;
  gap: 1rem;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 0.375rem var(--gutter) 0.5rem;
  border-top: 1px solid var(--line);
}

.rail-index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  white-space: nowrap;
}

.rail-scale {
  position: relative;
  flex: 1 1 auto;
  height: 2px;
  background: var(--line);
}

.rail-scale::after {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: var(--rail-progress, 0%);
  height: 4px;
  background: linear-gradient(90deg, var(--orange), var(--volt));
  transition: width 0.14s linear;
}

/* ---------- 6 页脚 ---------- */
.site-footer {
  margin-top: calc(var(--row) * 2);
  background: var(--pitch-900);
  border-top: 1px solid var(--line);
}

.footer-frame {
  display: grid;
  grid-template-columns: minmax(12rem, 16rem) minmax(0, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(2.5rem, 5vw, 4rem) var(--gutter) 0;
}

.footer-brand { display: flex; flex-direction: column; gap: 0.5rem; }

.footer-mark {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  margin-bottom: 0.25rem;
  border: 1px solid var(--brass);
  color: var(--brass);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.footer-brand-name { font-size: 1.25rem; font-weight: 800; letter-spacing: 0.02em; }

.footer-domain {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.5rem);
}

.footer-col-title {
  margin-bottom: 0.875rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
  color: var(--brass);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.18em;
}

.footer-links { display: flex; flex-direction: column; gap: 0.5rem; }

.footer-link {
  width: fit-content;
  border-bottom: 1px solid transparent;
  color: var(--muted);
  font-size: 0.9375rem;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.footer-link:hover { color: var(--orange); border-bottom-color: var(--orange); }

.footer-text {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.7;
}

.footer-text span { display: block; word-break: break-word; }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  max-width: var(--shell);
  margin: clamp(2rem, 4vw, 3rem) auto 0;
  padding: 1rem var(--gutter) 2rem;
  border-top: 1px solid var(--line);
}

.footer-closing {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.footer-legal {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.footer-legal a {
  border-bottom: 1px solid var(--line-strong);
  color: var(--fg);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.footer-legal a:hover { color: var(--volt); border-bottom-color: var(--volt); }

/* ---------- 7 通用组件 ---------- */
.panel {
  padding: clamp(1.25rem, 3vw, 2.5rem);
  border: 1px solid var(--line);
  background: rgba(14, 58, 63, 0.42);
}

.panel--pitch { background: var(--pitch-900); }
.panel--teal { background: var(--teal-800); }
.panel--burgundy { background: var(--burgundy-700); }
.panel--indigo { background: var(--indigo-700); }

.panel--paper {
  background: var(--paper);
  border-color: rgba(10, 20, 18, 0.18);
  color: var(--ink);
}

.panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line);
}

.panel--paper .panel-head { border-bottom-color: rgba(10, 20, 18, 0.16); }

.panel-title {
  font-size: clamp(1.25rem, 2vw, 1.625rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.band {
  padding: clamp(1.5rem, 3vw, 2.25rem) var(--gutter);
  background: var(--burgundy-700);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--fg);
}

.band--teal { background: var(--teal-800); }
.band--indigo { background: var(--indigo-700); }
.band--orange { background: var(--orange); color: var(--ink); }
.band--orange .index-label { color: var(--ink); }
.band--orange .index-label::before { background: var(--ink); }

.band-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--shell);
  margin-inline: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8125rem 1.25rem;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

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

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.btn--primary:hover {
  background: var(--volt);
  border-color: var(--volt);
  color: var(--ink);
}

.btn--ghost { border-color: var(--line); color: var(--muted); }
.btn--ghost:hover { color: var(--fg); border-color: var(--fg); }

.band--orange .btn { border-color: rgba(10, 20, 18, 0.4); color: var(--ink); }
.band--orange .btn:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.index-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--brass);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
}

.index-label::before {
  content: "";
  width: 1.5rem;
  height: 1px;
  background: currentColor;
}

.display-title {
  margin: 0;
  font-size: clamp(2.5rem, 6vw, 6.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 0.98;
}

.display-title .thin-word { font-weight: 200; color: var(--muted); }
.tone-word { color: var(--orange); }

.stat-figure {
  display: inline-block;
  color: var(--volt);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.75rem, 3.4vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
}

.stat-figure .stat-unit {
  margin-left: 0.35rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.12em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--line-strong);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
}

.tag--live { border-color: var(--orange); color: var(--orange); }
.tag--brass { border-color: var(--brass); color: var(--brass); }

.prose {
  max-width: 68ch;
  color: var(--fg);
}

.prose p { margin-bottom: 1.25rem; }
.prose p:last-child { margin-bottom: 0; }

.prose h2,
.prose h3 { margin: 2rem 0 0.75rem; }

.prose strong { font-weight: 800; color: var(--orange); }

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

.panel--paper .prose { color: var(--ink); }
.panel--paper .prose strong { color: var(--burgundy-700); }
.panel--paper .prose a { color: var(--burgundy-700); border-bottom-color: var(--burgundy-700); }

.breadcrumbs {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumbs a { color: var(--muted); border-bottom: 1px solid transparent; }
.breadcrumbs a:hover { color: var(--volt); border-bottom-color: var(--volt); }
.breadcrumbs [aria-current="page"] { color: var(--fg); }

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: rgba(169, 180, 176, 0.5);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: rgba(11, 42, 33, 0.5);
}

.data-table {
  width: 100%;
  min-width: 34rem;
  font-size: 0.9375rem;
}

.data-table caption {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-align: left;
}

.data-table th,
.data-table td {
  padding: 0.6875rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.data-table thead th {
  background: rgba(14, 58, 63, 0.55);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.14em;
}

.data-table tbody tr:hover { background: rgba(180, 255, 58, 0.06); }
.data-table tbody tr:last-child th,
.data-table tbody tr:last-child td { border-bottom: 0; }

.data-table .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.data-table .unit {
  margin-left: 0.25rem;
  color: var(--muted);
  font-size: 0.75rem;
}

.data-table--paper {
  background: var(--paper);
  color: var(--ink);
}

.data-table--paper thead th { background: #E4E0D4; color: #3C4744; }
.data-table--paper th,
.data-table--paper td { border-bottom-color: rgba(10, 20, 18, 0.14); }
.data-table--paper tbody tr:hover { background: rgba(90, 26, 42, 0.06); }

.chip-row { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.chip {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.chip:hover { color: var(--fg); border-color: var(--fg); }

.chip[aria-pressed="true"] {
  background: var(--volt);
  border-color: var(--volt);
  color: var(--ink);
  font-weight: 700;
}

.disclosure {
  border: 1px solid var(--line);
  background: rgba(14, 58, 63, 0.32);
}

.disclosure + .disclosure { margin-top: -1px; }
.disclosure[data-open="true"] { border-color: var(--line-strong); }

.disclosure__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 1rem 1.125rem;
  color: var(--fg);
  font-size: 1rem;
  font-weight: 700;
  text-align: left;
}

.disclosure__trigger::after {
  content: "+";
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
}

.disclosure__trigger[aria-expanded="true"]::after { content: "–"; }

.disclosure__panel {
  padding: 1rem 1.125rem 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.disclosure__panel[hidden] { display: none; }

/* ---------- 8 媒体容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  background-color: var(--teal-800);
  background-image:
    linear-gradient(to right, rgba(169, 180, 176, 0.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(169, 180, 176, 0.12) 1px, transparent 1px);
  background-size: 32px 32px;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--21x9 { aspect-ratio: 21 / 9; }

.media-caption {
  margin-top: 0.5rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
}

.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: var(--row);
}

/* ---------- 9 响应式 ---------- */
@media (max-width: 1240px) {
  .tool-link { display: none; }
}

@media (max-width: 1080px) {
  .brand-domain { display: none; }
  .footer-frame { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 960px) {
  .nav-toggle { display: inline-flex; }

  .site-header[data-open="true"] .nav-toggle-bar:first-child {
    transform: translateY(2.5px) rotate(45deg);
  }

  .site-header[data-open="true"] .nav-toggle-bar:last-child {
    transform: translateY(-2.5px) rotate(-45deg);
  }

  .nav-zone {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 120;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: min(90vw, 22rem);
    height: 100dvh;
    padding: calc(var(--header-h) + 1rem) var(--gutter) 2rem;
    background: var(--teal-800);
    border-left: 1px solid var(--line);
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform 0.28s ease;
  }

  .site-header[data-open="true"] .nav-zone { transform: translateX(0); }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-top: 1px solid var(--line);
  }

  .nav-list li { border-bottom: 1px solid var(--line); }
  .nav-list a { padding: 0.875rem 0; font-size: 1.0625rem; }
  .nav-list a::after { display: none; }

  .nav-list a[aria-current="page"] {
    padding-left: 0.75rem;
    border-left: 2px solid var(--volt);
  }

  .nav-tools {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding-left: 0;
    border-left: 0;
  }

  .tool-link {
    display: block;
    padding: 0.625rem 0.75rem;
    border-color: var(--line);
    text-align: left;
  }

  .tool-cta { padding: 0.75rem; text-align: center; }

  .nav-scrim { display: block; }
  .site-header[data-open="true"] .nav-scrim { opacity: 1; pointer-events: auto; }

  .header-rail { padding-bottom: 0.4375rem; }
  .rail-index { font-size: 0.625rem; letter-spacing: 0.14em; }
}

@media (max-width: 900px) {
  .span-3,
  .span-4,
  .span-6,
  .span-8 { grid-column: span 12; }
}

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .brand-tagline { display: none; }
  .rail-index { max-width: 46%; overflow: hidden; text-overflow: ellipsis; }
}

/* ---------- 10 显现与动效降级 ---------- */
[data-reveal] { transition: opacity 0.45s ease, transform 0.45s ease; }
[data-reveal].is-pending { opacity: 0; transform: translateY(12px); }
[data-reveal].is-visible { opacity: 1; transform: none; }

@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].is-pending { opacity: 1; transform: none; }
  .rail-scale::after { transition: none; }
}