/* ==========================================================================
   球帝指南 · 共享样式表 /assets/site.css
   骨架：技术蓝图网格 · 松墨绿结构 · 信号橙状态
   ========================================================================== */

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

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

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

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

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

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

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

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

:focus-visible {
  outline: 2px solid #E85D1F;
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- 2. Variables ---------- */
:root {
  --ink-900: #0B2B25;
  --ink-700: #12483C;
  --ink-500: #1C6B58;
  --signal-500: #E85D1F;
  --signal-600: #CF4F16;
  --signal-100: #FFE6D8;
  --paper: #F4F6F4;
  --line: #DCE3DF;
  --slate: #54645F;
  --black: #14201D;
  --archive: #6B2B44;
  --indigo: #3B3A78;

  --fs-12: 0.75rem;
  --fs-14: 0.875rem;
  --fs-16: 1rem;
  --fs-20: 1.25rem;
  --fs-26: 1.625rem;
  --fs-32: 2rem;
  --fs-44: 2.75rem;
  --fs-56: 3.5rem;

  --font-display: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
    "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
    "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", SimSun, serif;
  --font-mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;

  --shell-w: 1180px;
  --gutter: 20px;
  --gap: 28px;
  --nav-bp: 920px;
}

/* ---------- 3. 中文排版基线 ---------- */
body {
  font-family: var(--font-body);
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--black);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
  word-break: normal;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink-900);
  font-stretch: condensed;
}

h1 { font-size: var(--fs-44); }
h2 { font-size: var(--fs-32); }
h3 { font-size: var(--fs-26); }
h4 { font-size: var(--fs-20); }

strong, b { font-weight: 700; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}

/* ---------- 4. 布局工具 ---------- */
.shell {
  width: min(var(--shell-w), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

.grid { display: grid; gap: var(--gap); }
.grid--4-8 { grid-template-columns: 4fr 8fr; }
.grid--7-5 { grid-template-columns: 7fr 5fr; }
.grid--trio { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.stack {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ---------- 5. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.08em;
  line-height: 1.4;
  transition: background-color 0.18s ease, color 0.18s ease,
    border-color 0.18s ease;
}

.btn--signal {
  background-color: var(--signal-500);
  color: #FFFFFF;
  font-weight: 700;
}
.btn--signal:hover { background-color: var(--signal-600); }

.btn--ink {
  background-color: var(--ink-700);
  color: var(--paper);
}
.btn--ink:hover { background-color: var(--ink-500); }

.btn--ghost {
  border-color: var(--line);
  color: var(--ink-900);
  background-color: transparent;
}
.btn--ghost:hover {
  border-color: var(--ink-500);
  color: var(--ink-500);
  background-color: rgba(28, 107, 88, 0.06);
}

.btn--light {
  border-color: rgba(244, 246, 244, 0.35);
  color: var(--paper);
  background-color: transparent;
}
.btn--light:hover {
  border-color: var(--signal-500);
  color: var(--signal-100);
  background-color: rgba(232, 93, 31, 0.16);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border-radius: 2px;
  background-color: var(--signal-100);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.05em;
  line-height: 1.6;
}
.tag--archive { background-color: var(--archive); color: #FFFFFF; }
.tag--indigo { background-color: var(--indigo); color: #FFFFFF; }
.tag--ink { background-color: var(--ink-700); color: var(--paper); }
.tag--line {
  background-color: transparent;
  border: 1px solid var(--line);
  color: var(--slate);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 16px 0;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--slate);
}
.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumb__item::after {
  content: "/";
  color: var(--line);
}
.breadcrumb__item:last-child::after { content: ""; }
.breadcrumb a { transition: color 0.18s ease; }
.breadcrumb a:hover { color: var(--ink-500); }
.breadcrumb [aria-current="page"] { color: var(--ink-900); }

.prose {
  max-width: 36em;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--black);
}
.prose p + p { margin-top: 1em; }
.prose h2 {
  font-size: var(--fs-26);
  margin: 1.6em 0 0.6em;
}
.prose h3 {
  font-size: var(--fs-20);
  margin: 1.4em 0 0.5em;
}
.prose ul,
.prose ol {
  margin: 1em 0;
  padding-left: 1.3em;
  list-style: revert;
}
.prose li + li { margin-top: 0.4em; }
.prose a {
  color: var(--ink-500);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.prose a:hover { color: var(--signal-600); }
.prose blockquote {
  margin: 1.4em 0;
  padding: 4px 0 4px 18px;
  border-left: 3px solid var(--signal-500);
  color: var(--slate);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
  padding-bottom: 12px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.section-head__no {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--signal-500);
}
.section-head__title {
  font-family: var(--font-display);
  font-size: var(--fs-26);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--ink-900);
}
.section-head__note {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--slate);
}

.band {
  background-color: var(--ink-700);
  color: var(--paper);
  padding: clamp(32px, 5vw, 56px) 0;
}
.band--indigo { background-color: var(--indigo); }
.band--archive { background-color: var(--archive); }
.band .section-head { border-bottom-color: rgba(244, 246, 244, 0.2); }
.band .section-head__title { color: var(--paper); }
.band .section-head__note { color: rgba(244, 246, 244, 0.6); }
.band .section-head__no { color: var(--signal-100); }

/* 可复用图片容器 —— 页面阶段直接放入 <img> */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  background-color: var(--paper);
  background-image:
    repeating-linear-gradient(90deg, rgba(28, 107, 88, 0.07) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(0deg, rgba(28, 107, 88, 0.07) 0 1px, transparent 1px 24px);
}
.media-frame > img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 8px;
  z-index: 2;
  border: 1px dashed rgba(84, 100, 95, 0.34);
  pointer-events: none;
}
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--3x4 { aspect-ratio: 3 / 4; }
.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 3;
  padding: 6px 10px;
  background-color: rgba(11, 43, 37, 0.84);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.05em;
}

/* 滚动进度（由 JS 注入 body 首位） */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 250;
  pointer-events: none;
  background-color: rgba(220, 227, 223, 0.55);
}
.read-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background-image: linear-gradient(90deg, var(--ink-500), var(--signal-500));
  transition: width 0.1s linear;
}

/* ---------- 6. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 300;
  display: inline-block;
  padding: 10px 18px;
  border-radius: 2px;
  background-color: var(--signal-500);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.06em;
  box-shadow: 0 8px 24px rgba(11, 43, 37, 0.28);
  transition: top 0.18s ease;
}
.skip-link:focus,
.skip-link:focus-visible { top: 16px; }

/* ---------- 7. 刊头 ---------- */
.masthead {
  position: relative;
  z-index: 80;
  background-color: var(--paper);
  border-bottom: 1px solid var(--line);
}

.masthead__top {
  background-color: var(--ink-900);
  color: var(--paper);
}

.masthead__utility {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 42px;
}

.brand-tag {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: rgba(244, 246, 244, 0.7);
  transition: color 0.18s ease;
}
.brand-tag:hover { color: var(--signal-100); }
.brand-tag__mark {
  color: var(--signal-500);
  font-size: var(--fs-14);
  line-height: 1;
}

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

.ver-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border: 1px solid rgba(244, 246, 244, 0.28);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: rgba(244, 246, 244, 0.76);
  transition: border-color 0.18s ease, color 0.18s ease,
    background-color 0.18s ease;
}
.ver-chip:hover {
  border-color: var(--signal-500);
  background-color: rgba(232, 93, 31, 0.16);
  color: #FFFFFF;
}
.ver-chip__label { color: rgba(244, 246, 244, 0.56); }
.ver-chip__no {
  color: var(--signal-100);
  font-weight: 700;
}

.utility-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 9px;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: rgba(244, 246, 244, 0.76);
  transition: color 0.18s ease, background-color 0.18s ease;
}
.utility-link:hover {
  color: #FFFFFF;
  background-color: rgba(244, 246, 244, 0.1);
}
.utility-link__icon {
  position: relative;
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 1.5px solid currentColor;
  border-radius: 50%;
}
.utility-link__icon::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -3px;
  width: 6px;
  height: 1.5px;
  background-color: currentColor;
  transform: rotate(45deg);
}

.masthead__bar {
  position: relative;
  background-image: linear-gradient(
    180deg,
    rgba(220, 227, 223, 0.6),
    rgba(244, 246, 244, 0) 82%
  );
}
.masthead__bar::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(
    90deg,
    rgba(28, 107, 88, 0.07) 1px,
    transparent 1px
  );
  background-size: 72px 100%;
}

.masthead__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 22px 0 18px;
}

.masthead__kicker {
  justify-self: start;
  max-width: 15em;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  line-height: 1.7;
  color: var(--slate);
}

.masthead__brand {
  justify-self: center;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  text-align: center;
}
.masthead__brand-name {
  font-family: var(--font-display);
  font-size: var(--fs-44);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--ink-900);
  font-stretch: condensed;
  transition: color 0.18s ease;
}
.masthead__brand:hover .masthead__brand-name { color: var(--ink-700); }
.masthead__brand-latin {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  text-transform: uppercase;
  color: var(--slate);
}
.masthead__brand::after {
  content: "";
  display: block;
  width: 30px;
  height: 2px;
  margin-top: 4px;
  background-color: var(--signal-500);
}

.masthead__issue {
  justify-self: end;
  text-align: right;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  line-height: 1.8;
  color: var(--slate);
}
.masthead__issue-line { display: block; }
.masthead__issue-line + .masthead__issue-line { color: var(--ink-500); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background-color: var(--paper);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--ink-900);
  transition: border-color 0.18s ease, color 0.18s ease;
}
.nav-toggle:hover {
  border-color: var(--ink-500);
  color: var(--ink-500);
}
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}
.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background-color: currentColor;
  transition: transform 0.18s ease, opacity 0.18s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(4.5px) 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(-4.5px) rotate(-45deg);
}

.primary-nav {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  background-color: rgba(244, 246, 244, 0.65);
}
.primary-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  width: min(var(--shell-w), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}
.primary-nav__item { display: flex; }
.primary-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px clamp(10px, 1.5vw, 20px) 11px;
  border-bottom: 2px solid transparent;
  font-size: var(--fs-16);
  line-height: 1.4;
  color: var(--ink-900);
  transition: color 0.18s ease, border-color 0.18s ease,
    background-color 0.18s ease;
}
.primary-nav__no {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--slate);
  transition: color 0.18s ease;
}
.primary-nav__link:hover {
  color: var(--ink-500);
  border-bottom-color: var(--ink-500);
  background-color: rgba(28, 107, 88, 0.06);
}
.primary-nav__link:hover .primary-nav__no { color: var(--ink-500); }

.primary-nav__link--spot { color: var(--ink-500); }
.primary-nav__link--spot .primary-nav__no { color: var(--signal-500); }
.primary-nav__link--spot:hover {
  color: var(--ink-700);
  border-bottom-color: var(--signal-500);
}

.primary-nav__link[aria-current="page"] {
  color: var(--ink-900);
  font-weight: 700;
  border-bottom-color: var(--signal-500);
}
.primary-nav__link[aria-current="page"] .primary-nav__no {
  color: var(--signal-500);
}

/* ---------- 8. 页脚 ---------- */
.site-foot {
  position: relative;
  margin-top: 0;
  background-color: var(--ink-900);
  color: rgba(244, 246, 244, 0.76);
  border-top: 3px solid var(--signal-500);
}
.site-foot::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(244, 246, 244, 0.05) 1px, transparent 1px),
    linear-gradient(180deg, rgba(244, 246, 244, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.85;
}

.site-foot__main {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 4fr 8fr;
  gap: clamp(28px, 4vw, 64px);
  padding: 56px 0 44px;
}

.site-foot__lead {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
}
.site-foot__brand {
  font-family: var(--font-display);
  font-size: var(--fs-26);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--paper);
  transition: color 0.18s ease;
}
.site-foot__brand:hover { color: var(--signal-100); }
.site-foot__latin {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: rgba(244, 246, 244, 0.44);
}
.site-foot__note {
  max-width: 22em;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: rgba(244, 246, 244, 0.62);
}
.site-foot__ver {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 2px;
  padding: 4px 10px;
  border: 1px solid rgba(244, 246, 244, 0.18);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.05em;
  color: rgba(244, 246, 244, 0.6);
}
.site-foot__ver .mono { color: var(--signal-100); }

.site-foot__cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 2.4vw, 36px);
}
.site-foot__col { min-width: 0; }
.site-foot__col-title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid rgba(244, 246, 244, 0.14);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 400;
  letter-spacing: 0.12em;
  color: rgba(244, 246, 244, 0.9);
}
.site-foot__col-no { color: var(--signal-500); }
.site-foot__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.site-foot__list a {
  display: inline-block;
  font-size: var(--fs-14);
  line-height: 1.6;
  color: rgba(244, 246, 244, 0.68);
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.site-foot__list a:hover {
  color: var(--signal-100);
  border-bottom-color: var(--signal-500);
}

.site-foot__base {
  position: relative;
  z-index: 1;
  background-color: rgba(0, 0, 0, 0.24);
  border-top: 1px solid rgba(244, 246, 244, 0.1);
}
.site-foot__base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding: 18px 0 22px;
}
.site-foot__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: rgba(244, 246, 244, 0.52);
}
.site-foot__legal-item { white-space: nowrap; }
.site-foot__copy {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: rgba(244, 246, 244, 0.42);
}
.site-foot__arch {
  flex-basis: 100%;
  font-size: var(--fs-12);
  line-height: 1.8;
  color: rgba(244, 246, 244, 0.52);
}
.site-foot__arch a {
  color: var(--signal-100);
  border-bottom: 1px solid rgba(232, 93, 31, 0.55);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}
.site-foot__arch a:hover {
  color: #FFFFFF;
  border-bottom-color: var(--signal-500);
}

/* ---------- 9. 响应式 ---------- */
@media (max-width: 920px) {
  .grid--4-8,
  .grid--7-5 { grid-template-columns: 1fr; }

  .masthead__grid {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px 0 14px;
    gap: 12px;
  }
  .masthead__kicker,
  .masthead__issue { display: none; }
  .masthead__brand-name { font-size: var(--fs-32); }
  .masthead__brand-latin { letter-spacing: 0.2em; text-indent: 0.2em; }
  .nav-toggle {
    display: inline-flex;
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 95;
  }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 90;
    max-height: 0;
    overflow: hidden;
    border-top: 1px solid rgba(244, 246, 244, 0.12);
    background-color: var(--ink-900);
    transition: max-height 0.3s ease;
  }
  .primary-nav[data-open="true"] {
    max-height: min(78vh, 560px);
    overflow-y: auto;
  }
  .primary-nav__list {
    display: block;
    width: 100%;
    padding: 6px var(--gutter) 18px;
  }
  .primary-nav__item {
    display: block;
    border-bottom: 1px solid rgba(244, 246, 244, 0.1);
  }
  .primary-nav__link {
    display: flex;
    justify-content: space-between;
    width: 100%;
    padding: 14px 4px;
    border-bottom: 0;
    font-size: var(--fs-16);
    color: rgba(244, 246, 244, 0.86);
  }
  .primary-nav__no { color: rgba(244, 246, 244, 0.45); }
  .primary-nav__link:hover {
    color: #FFFFFF;
    background-color: rgba(244, 246, 244, 0.06);
    border-bottom-color: transparent;
  }
  .primary-nav__link:hover .primary-nav__no { color: var(--signal-100); }
  .primary-nav__link--spot { color: var(--signal-100); }
  .primary-nav__link--spot:hover {
    color: var(--signal-100);
    border-bottom-color: transparent;
  }
  .primary-nav__link[aria-current="page"] {
    padding-left: 12px;
    color: var(--signal-100);
    font-weight: 700;
    border-bottom-color: transparent;
    box-shadow: inset 3px 0 0 var(--signal-500);
  }
  .primary-nav__link[aria-current="page"] .primary-nav__no {
    color: var(--signal-500);
  }

  .site-foot__main {
    grid-template-columns: 1fr;
    padding: 42px 0 34px;
  }
  .site-foot__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }
}

@media (max-width: 720px) {
  .grid--trio { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  :root { --gutter: 16px; --gap: 22px; }
  .masthead__brand-name { font-size: var(--fs-32); }
  .masthead__brand-latin { font-size: var(--fs-12); }
  .masthead__tools .ver-chip__label { display: none; }
  .site-foot__cols { grid-template-columns: 1fr; gap: 22px; }
  .site-foot__base-inner { flex-direction: column; align-items: flex-start; }
  .prose { font-size: var(--fs-16); }
}

/* ---------- 10. 减少动态效果 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .read-progress__bar { transition: none; }
  .primary-nav { transition: none; }
}