/* ===========================================================
   狗威看台 · 共享样式表 /assets/site.css
   赛场绿 / 裁判红 / 警告黄 / 炭黑 / 米白 —— 战术板式数据看台
   =========================================================== */

/* ---------- 1. reset ---------- */
*,
*::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, pre { margin: 0; }

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

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

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

button {
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

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

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

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

/* ---------- 2. 变量 ---------- */
:root {
  --green-900: #0B3B24;
  --green-600: #17703F;
  --green-300: #6FBF97;
  --teal: #12B7A0;
  --red: #D7263D;
  --yellow: #F2C230;
  --amber: #8A6500;
  --ink: #14181B;
  --ink-soft: #4A5257;
  --paper: #F6F4EF;
  --paper-pure: #FFFFFF;
  --rule: #DCD8CF;

  --font-head: "Inter Tight", "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", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell: 1200px;
  --doc: 760px;
  --radius: 2px;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--paper);
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(30px, 5vw, 52px); }
h2 { font-size: clamp(24px, 3.2vw, 34px); }
h3 { font-size: clamp(19px, 2vw, 23px); }
h4 { font-size: 17px; }

p { max-width: 68ch; }

strong, b { font-weight: 800; }

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

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

#main-content { display: block; scroll-margin-top: 150px; }

/* ---------- 4. 工具类与通用按钮 ---------- */
.shell {
  width: min(var(--shell), 100% - 32px);
  margin-inline: auto;
}

.mono {
  font-family: var(--font-mono);
  font-variant-ligatures: none;
  letter-spacing: 0.02em;
}

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

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--green-600);
}

.label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  background: var(--green-600);
  color: var(--paper);
  padding: 3px 8px;
  border-radius: var(--radius);
}

.lead {
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.65;
  color: var(--ink-soft);
}

.muted { color: var(--ink-soft); }

.note {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.rule {
  height: 1px;
  border: 0;
  background: var(--rule);
}

.pitch-grid {
  background-image:
    repeating-linear-gradient(0deg, rgba(220, 216, 207, .9) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(90deg, rgba(220, 216, 207, .9) 0 1px, transparent 1px 48px);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 15px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.btn--primary { background: var(--green-600); color: var(--paper); }
.btn--primary:hover { background: var(--green-900); }

.btn--ghost { border-color: var(--ink); color: var(--ink); background: transparent; }
.btn--ghost:hover { background: var(--ink); color: var(--paper); }

.btn--accent { background: var(--yellow); color: var(--ink); }
.btn--accent:hover { background: #DFAF22; }

.btn--sm { font-size: 13px; padding: 8px 14px; }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

/* ---------- 5. 页头 ---------- */
.skip-link {
  position: fixed;
  left: 50%;
  top: 0;
  z-index: 300;
  transform: translate(-50%, -160%);
  background: var(--yellow);
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
  padding: 10px 20px;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: transform .18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible { transform: translate(-50%, 0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  width: 100%;
  height: 3px;
  background: var(--yellow);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.header-band {
  background: var(--green-900);
  color: var(--green-300);
  max-height: 44px;
  overflow: hidden;
  transition: max-height .28s var(--ease), opacity .2s linear;
}

.site-header[data-condensed] .header-band {
  max-height: 0;
  opacity: 0;
}

.band-inner {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 36px;
  padding: 6px 0;
}

.band-tag {
  flex: none;
  background: var(--yellow);
  color: var(--ink);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  padding: 2px 8px;
  border-radius: var(--radius);
  transform: skewX(-6deg);
}

.band-scroll {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--green-300);
}

.band-meta {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--paper);
  padding-left: 12px;
  border-left: 1px solid rgba(111, 191, 151, .35);
}

.masthead { background: var(--paper); }

.masthead-inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  padding: 20px 0 16px;
  transition: padding .25s var(--ease);
}

.site-header[data-condensed] .masthead-inner { padding: 10px 0 8px; }

.masthead-side {
  display: flex;
  align-items: center;
  gap: 8px;
}

.masthead-side--start { justify-self: start; }
.masthead-side--end { justify-self: end; }

.masthead-note {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
  white-space: nowrap;
}

.brand {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  text-align: center;
  padding: 2px 8px;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--green-600);
  color: var(--paper);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 5px 7px;
  border-radius: var(--radius);
  transform: skewX(-6deg);
}

.brand-name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
  transition: font-size .25s var(--ease);
}

.site-header[data-condensed] .brand-name { font-size: clamp(20px, 2.4vw, 26px); }

.brand-tag {
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  max-height: 24px;
  overflow: hidden;
  transition: opacity .2s linear, max-height .25s var(--ease);
}

.site-header[data-condensed] .brand-tag {
  opacity: 0;
  max-height: 0;
}

.quick-action {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 8px 14px;
  border: 1px solid var(--green-600);
  border-radius: var(--radius);
  color: var(--green-600);
  background: transparent;
  white-space: nowrap;
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.quick-action:hover {
  background: var(--green-600);
  color: var(--paper);
}

.quick-action--solid {
  background: var(--green-600);
  color: var(--paper);
}

.quick-action--solid:hover {
  background: var(--green-900);
  border-color: var(--green-900);
  color: var(--paper);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--green-600);
  border-radius: var(--radius);
  color: var(--green-600);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.nav-toggle:hover {
  background: var(--green-600);
  color: var(--paper);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 16px;
  height: 12px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform .2s var(--ease), opacity .2s linear;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.nav-toggle__text { font-family: var(--font-mono); }

.site-nav {
  background: var(--green-600);
  color: var(--paper);
  border-bottom: 1px solid var(--green-900);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 2px;
}

.nav-list a {
  display: block;
  padding: 12px 16px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: rgba(246, 244, 239, .86);
  border-top: 3px solid transparent;
  border-bottom: 3px solid transparent;
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.nav-list a:hover {
  color: #FFFFFF;
  background: rgba(11, 59, 36, .55);
  border-bottom-color: var(--yellow);
}

.nav-list a[aria-current="page"] {
  background: var(--yellow);
  color: var(--green-900);
  font-weight: 800;
  border-bottom-color: var(--yellow);
  border-top-color: var(--yellow);
}

.site-nav :focus-visible { outline-color: var(--yellow); }

/* ---------- 6. 页脚 ---------- */
.site-footer {
  margin-top: 80px;
  background: var(--green-900);
  color: var(--paper);
  border-top: 4px solid var(--yellow);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) 2fr;
  gap: 44px;
  padding: 56px 0 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.footer-brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.footer-mark {
  background: var(--yellow);
  color: var(--green-900);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 5px 8px;
  border-radius: var(--radius);
  transform: skewX(-6deg);
}

.footer-name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 26px;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.footer-line {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--green-300);
  max-width: 24ch;
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  padding: 9px 14px;
  border: 1px solid rgba(246, 244, 239, .35);
  border-radius: var(--radius);
  color: var(--paper);
  transition: background-color .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.to-top:hover {
  background: var(--yellow);
  color: var(--green-900);
  border-color: var(--yellow);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--yellow);
  padding-top: 10px;
  border-top: 2px solid var(--yellow);
  margin-bottom: 14px;
}

.footer-col a {
  display: inline-block;
  padding: 5px 0;
  font-size: 15px;
  color: rgba(246, 244, 239, .82);
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.footer-col a:hover {
  color: var(--teal);
  border-bottom-color: var(--teal);
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 26px;
  padding: 20px 0;
  border-top: 1px solid rgba(246, 244, 239, .16);
  font-size: 13.5px;
  color: var(--paper);
}

.footer-contact-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.footer-contact-key {
  font-size: 10.5px;
  letter-spacing: 0.12em;
  background: var(--green-300);
  color: var(--green-900);
  padding: 2px 6px;
  border-radius: var(--radius);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 24px;
  padding: 16px 0 30px;
  border-top: 1px solid rgba(246, 244, 239, .16);
  font-size: 12.5px;
  color: rgba(246, 244, 239, .62);
}

.footer-legal .mono {
  color: var(--green-300);
  letter-spacing: 0.06em;
}

.footer-legal-note { color: rgba(246, 244, 239, .55); }

.site-footer :focus-visible { outline-color: var(--yellow); }

/* ---------- 7. 版式骨架 ---------- */
.doc {
  width: min(var(--doc), 100%);
  margin-inline: auto;
}

.prose > * + * { margin-top: 1.05em; }
.prose h2 { margin-top: 2.2em; }
.prose h3 { margin-top: 1.6em; }
.prose ul li {
  position: relative;
  padding-left: 20px;
}
.prose ul li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: .72em;
  width: 8px;
  height: 8px;
  background: var(--green-300);
  border-radius: 1px;
}

.grid {
  display: grid;
  gap: 20px;
}

.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)); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.35fr);
  gap: 40px;
  align-items: start;
}

.section { padding: 64px 0; }
.section--tight { padding: 36px 0; }

.section--dark {
  background: var(--green-900);
  color: var(--paper);
}

.section--dark .lead,
.section--dark .muted,
.section--dark .note { color: var(--green-300); }

.section--dark .rule { background: rgba(246, 244, 239, .2); }

.section--band {
  background: var(--green-300);
  color: var(--ink);
}

.chapter-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--rule);
}

.chapter-num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  background: var(--green-600);
  color: var(--paper);
  padding: 4px 8px;
  border-radius: var(--radius);
}

.chapter-head h2 { font-size: clamp(22px, 2.6vw, 30px); }

.chapter-note {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.section--dark .chapter-head { border-bottom-color: rgba(246, 244, 239, .2); }
.section--dark .chapter-note { color: var(--green-300); }

/* ---------- 8. 面包屑 ---------- */
.crumbs {
  padding: 18px 0 0;
  font-size: 13px;
  color: var(--ink-soft);
}

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
}

.crumbs li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.crumbs li + li::before {
  content: "/";
  font-family: var(--font-mono);
  color: var(--rule);
}

.crumbs a {
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule);
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.crumbs a:hover {
  color: var(--green-600);
  border-bottom-color: var(--green-600);
}

.crumbs [aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 9. 卡片与指标 ---------- */
.card {
  background: var(--paper-pure);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 20px;
}

.card--dark {
  background: var(--green-900);
  border-color: var(--green-900);
  color: var(--paper);
}

.card--band {
  background: var(--paper-pure);
  border-left: 4px solid var(--green-600);
}

.card-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  letter-spacing: -0.01em;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.card--dark .card-meta { color: var(--green-300); }

.stat-card {
  background: var(--paper-pure);
  border: 1px solid var(--rule);
  border-top: 4px solid var(--green-600);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
}

.stat-card--red { border-top-color: var(--red); }
.stat-card--yellow { border-top-color: var(--yellow); }
.stat-card--teal { border-top-color: var(--teal); }

.stat-value {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  transform: skewX(-3deg);
}

.stat-card--red .stat-value { color: var(--red); }
.stat-card--yellow .stat-value { color: var(--amber); }
.stat-card--teal .stat-value { color: var(--green-600); }

.stat-label {
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

/* ---------- 10. 状态标签 ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 3px 9px;
  border-radius: var(--radius);
  background: var(--rule);
  color: var(--ink);
}

.badge--red { background: var(--red); color: #FFFFFF; }
.badge--yellow { background: var(--yellow); color: var(--ink); }
.badge--green { background: var(--green-600); color: var(--paper); }
.badge--teal { background: var(--teal); color: var(--ink); }

.badge--outline {
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--ink-soft);
}

/* ---------- 11. 数据带与轮次切换 ---------- */
.data-band {
  background: var(--green-300);
  border-top: 1px solid var(--green-600);
  border-bottom: 1px solid var(--green-600);
  padding: 28px 0;
}

.data-strip {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(230px, 1fr);
  gap: 14px;
  overflow-x: auto;
  padding: 4px 4px 18px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  scrollbar-color: var(--green-600) var(--rule);
}

.data-strip > * { scroll-snap-align: start; }

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tab {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  padding: 8px 13px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--paper-pure);
  color: var(--ink-soft);
  transition: background-color .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}

.tab:hover {
  border-color: var(--green-600);
  color: var(--green-600);
  background: #EAF5EF;
}

.tab[aria-selected="true"],
.tab[aria-pressed="true"] {
  background: var(--green-600);
  border-color: var(--green-600);
  color: var(--paper);
  font-weight: 700;
}

/* ---------- 12. 表格 ---------- */
.table-wrap {
  overflow-x: auto;
  background: var(--paper-pure);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.table {
  width: 100%;
  min-width: 560px;
  font-size: 14.5px;
}

.table caption {
  padding: 12px 14px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
}

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

.table thead th {
  background: var(--green-900);
  color: var(--paper);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-bottom: 0;
}

.table tbody tr:nth-child(even) { background: #FBFAF7; }
.table tbody tr:hover { background: #EAF5EF; }
.table td.num { text-align: right; }

/* ---------- 13. 图片容器（供页面阶段放置图片） ---------- */
.img-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--green-900);
  isolation: isolate;
}

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

.img-frame--16x9 { aspect-ratio: 16 / 9; }
.img-frame--4x3 { aspect-ratio: 4 / 3; }
.img-frame--1x1 { aspect-ratio: 1 / 1; }
.img-frame--tall { aspect-ratio: 4 / 5; }

.img-frame--empty {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--green-900);
  background-image:
    repeating-linear-gradient(0deg, rgba(246, 244, 239, .08) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(90deg, rgba(246, 244, 239, .08) 0 1px, transparent 1px 44px);
  color: var(--green-300);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}

.img-frame--empty::after { content: attr(data-label); }

.img-frame--tactics::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-image: repeating-linear-gradient(115deg, rgba(18, 183, 160, .5) 0 1px, transparent 1px 34px);
  opacity: .7;
}

.img-frame__tag {
  position: absolute;
  left: 12px;
  top: 12px;
  z-index: 2;
}

.img-frame__caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* ---------- 14. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}

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

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split { grid-template-columns: 1fr; gap: 28px; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 900px) {
  .masthead-inner {
    position: relative;
    grid-template-columns: 1fr;
    padding: 12px 0 10px;
  }

  .masthead-side--start { display: none; }

  .masthead-side--end {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    justify-self: auto;
  }

  .masthead-side--end .quick-action { display: none; }

  .nav-toggle { display: inline-flex; }

  .site-nav { display: none; }

  .site-nav[data-open] {
    display: block;
    animation: nav-drop .18s var(--ease) both;
  }

  @keyframes nav-drop {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: none; }
  }

  .nav-inner { display: block; padding: 6px 0 10px; }

  .nav-list {
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    gap: 0;
  }

  .nav-list a {
    padding: 13px 4px;
    border-top: 0;
    border-bottom: 1px solid rgba(246, 244, 239, .18);
    border-left: 3px solid transparent;
  }

  .nav-list a:hover { border-bottom-color: rgba(246, 244, 239, .18); }

  .nav-list li:last-child a { border-bottom: 0; }

  .nav-list a[aria-current="page"] {
    border-left-color: var(--yellow);
    border-top: 0;
    border-bottom-color: var(--yellow);
  }

  .band-meta { display: none; }

  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-contact { font-size: 13px; }
}

@media (max-width: 640px) {
  body { font-size: 16.5px; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }

  .section { padding: 44px 0; }
  .section--tight { padding: 28px 0; }

  .chapter-note { margin-left: 0; }

  .brand-name { font-size: 26px; }
  .brand-tag { font-size: 11px; }

  .masthead-note { display: none; }

  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
  .footer-top { padding: 40px 0 28px; }
  .footer-contact { flex-direction: column; align-items: flex-start; gap: 8px; }
  .data-strip { grid-auto-columns: minmax(200px, 1fr); }
}

/* ---------- 16. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }

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