/* ==========================================================================
   足彩网竞彩 · 共享样式表 /assets/site.css
   结构：令牌 → 重置 → 排版 → 布局工具 → 通用组件 → 刊头 → 页脚 → 响应式
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --pitch: #0B3D2E;
  --night: #0A1F19;
  --indigo: #123B33;
  --wine: #6E1B33;
  --cyan: #00E5A0;
  --amber: #FFB300;
  --magenta: #E91E63;
  --paper: #F6F4EC;
  --stack: #E4E0D2;
  --card: #FFFFFF;
  --ink: #2C2E36;
  --muted: #6C727C;
  --rule: #C9C4B2;
  --rule-soft: #DCD7C6;

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

  --wrap: 1240px;
  --narrow: 760px;
  --gutter: 24px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --dur: 220ms;
  --dur-slow: 320ms;
  --radius: 2px;
}

/* ---------- 2. 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dt, dd, hr {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

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

button { background: none; border: 0; }

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

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

[hidden] { display: none !important; }

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

/* ---------- 3. 中文排版与页面基础 ---------- */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: 0;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--pitch);
}

h1 { font-size: clamp(30px, 4.4vw, 44px); }
h2 { font-size: clamp(24px, 3vw, 34px); }
h3 { font-size: clamp(19px, 2vw, 22px); font-weight: 700; }
h4 { font-size: 18px; font-weight: 700; letter-spacing: -0.01em; }

p { text-wrap: pretty; }

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

.mono, code, kbd, samp, time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

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

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

.wrap--narrow { max-width: var(--narrow); }

.section { padding-block: clamp(60px, 8.5vw, 132px); }
.section--tight { padding-block: clamp(40px, 5vw, 72px); }

.bleed { padding-inline: var(--gutter); }

.section--paper  { background: var(--paper); color: var(--ink); }
.section--stack  { background: var(--stack); color: var(--ink); }
.section--dark   { background: var(--night); color: #fff; }
.section--pitch  { background: var(--pitch); color: #fff; }
.section--indigo { background: var(--indigo); color: #fff; }
.section--wine   { background: var(--wine);   color: #fff; }

.section--dark h1, .section--pitch h1, .section--indigo h1, .section--wine h1,
.section--dark h2, .section--pitch h2, .section--indigo h2, .section--wine h2,
.section--dark h3, .section--pitch h3, .section--indigo h3, .section--wine h3 { color: #fff; }

.section--dark strong, .section--pitch strong, .section--indigo strong, .section--wine strong { color: var(--cyan); }

.grid { display: grid; gap: 24px; }
.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)); }
.grid--7-5 { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.grid--8-4 { grid-template-columns: minmax(0, 8fr) minmax(0, 4fr); }
.grid--side { align-items: start; }

.stack-col { display: grid; gap: 16px; }
.row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.row--between { justify-content: space-between; }

.rule { height: 1px; background: var(--rule); border: 0; }
.rule--dark { background: rgba(255, 255, 255, 0.16); }

/* ---------- 5. 通用组件 ---------- */
/* 5.1 跳转链接 */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -120px;
  z-index: 200;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 20px;
  background: var(--amber);
  color: var(--night);
  font-weight: 700;
  font-size: 15px;
  border-radius: var(--radius);
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 12px; }

/* 5.2 焦点环 */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius);
}
.section--paper :focus-visible,
.section--stack :focus-visible {
  outline-color: var(--pitch);
}

/* 5.3 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 24px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  text-align: center;
  transition: transform var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}
.btn--primary { background: var(--amber); color: var(--night); border-color: var(--amber); }
.btn--primary:hover { transform: translateY(-2px); border-color: var(--night); }
.btn--dark { background: var(--pitch); color: #fff; border-color: var(--pitch); }
.btn--dark:hover { transform: translateY(-2px); border-color: var(--cyan); }
.btn--ghost { background: transparent; color: var(--cyan); border-color: rgba(0, 229, 160, 0.55); }
.btn--ghost:hover { background: rgba(0, 229, 160, 0.12); border-color: var(--cyan); transform: translateY(-2px); }
.btn--quiet { background: transparent; color: var(--pitch); border-color: var(--rule); }
.btn--quiet:hover { border-color: var(--pitch); transform: translateY(-2px); }
.btn--sm { min-height: 40px; padding: 0 16px; font-size: 14px; }
.btn[disabled], .btn[aria-disabled="true"] { opacity: 0.45; cursor: not-allowed; transform: none; }

/* 5.4 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--muted);
  white-space: nowrap;
}
.tag--amber { background: var(--amber); border-color: var(--amber); color: var(--night); }
.tag--cyan  { background: var(--cyan);  border-color: var(--cyan);  color: var(--night); }
.tag--wine  { background: var(--wine);  border-color: var(--wine);  color: #fff; }
.tag--dark  { background: var(--night); border-color: var(--night); color: var(--cyan); }

/* 5.5 面包屑 */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 18px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--pitch); text-decoration: underline; text-underline-offset: 3px; }
.crumbs__sep { color: var(--rule); }
.crumbs [aria-current="page"] { color: var(--pitch); font-weight: 700; }

/* 5.6 正文容器 */
.prose { max-width: var(--narrow); }
.prose > * + * { margin-top: 1.15em; }
.prose p { line-height: 1.9; }
.prose h2 { margin-top: 2.1em; }
.prose h3 { margin-top: 1.7em; }
.prose ul, .prose ol { display: grid; gap: 10px; }
.prose li { position: relative; padding-left: 26px; }
.prose ul li::before {
  content: "";
  position: absolute; left: 4px; top: 0.78em;
  width: 10px; height: 2px; background: var(--cyan);
}
.prose ol { counter-reset: prose-ol; }
.prose ol li::before {
  counter-increment: prose-ol;
  content: counter(prose-ol, decimal-leading-zero);
  position: absolute; left: 0; top: 0;
  font-family: var(--font-mono); font-size: 13px; color: var(--amber); font-weight: 700;
}
.prose a {
  color: var(--indigo);
  text-decoration: underline;
  text-decoration-color: var(--cyan);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
.prose a:hover { color: var(--pitch); }
.prose blockquote {
  border-left: 3px solid var(--amber);
  padding: 4px 0 4px 20px;
  color: var(--indigo);
  font-weight: 500;
}

/* 5.7 编号章节 */
.sec-head {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  margin-bottom: clamp(28px, 4vw, 52px);
}
.sec-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--muted);
  padding-top: 0.7em;
  transition: color var(--dur-slow) var(--ease);
}
.sec-num[data-lit] { color: var(--cyan); }
.section--paper .sec-num[data-lit],
.section--stack .sec-num[data-lit] { color: var(--pitch); }
.sec-title { margin-bottom: 10px; }
.sec-lead { max-width: 66ch; color: var(--ink); opacity: 0.82; }
.section--dark .sec-lead,
.section--pitch .sec-lead,
.section--indigo .sec-lead,
.section--wine .sec-lead { color: rgba(255, 255, 255, 0.78); opacity: 1; }

/* 5.8 卡片与纸张叠层 */
.card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: clamp(20px, 2.4vw, 30px);
  color: var(--ink);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.card--stack { box-shadow: 6px 6px 0 var(--stack), 7px 7px 0 var(--rule-soft); }
.card--stack:hover { transform: translateY(-2px); border-color: var(--pitch); box-shadow: 6px 10px 0 var(--stack), 7px 11px 0 var(--rule-soft); }
.card--frame { border: 1px solid var(--pitch); padding: clamp(14px, 2vw, 22px); }
.card--frame::before {
  content: "";
  position: absolute; inset: 8px;
  border: 1px solid var(--rule-soft);
  pointer-events: none;
}
.card__title { font-size: 22px; font-weight: 900; letter-spacing: -0.02em; margin-bottom: 8px; }
.card__meta { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; color: var(--muted); }
.card__text { font-size: 16px; line-height: 1.8; }
.card--dark { background: var(--night); border-color: rgba(0, 229, 160, 0.28); color: rgba(255, 255, 255, 0.85); }
.card--dark .card__title { color: #fff; }
.card--wine { background: var(--wine); border-color: rgba(255, 179, 0, 0.45); color: #fff; }
.card--wine .card__title { color: #fff; }

/* 5.9 图文容器 */
.ratio {
  position: relative;
  width: 100%;
  overflow: hidden;
  background: var(--stack);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}
.ratio::before {
  content: "";
  display: block;
  padding-top: var(--ratio, 56.25%);
}
.ratio > img,
.ratio > svg,
.ratio > picture,
.ratio > figure,
.ratio > .ratio__layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.ratio--wide   { --ratio: 56.25%; }
.ratio--panel  { --ratio: 42.85%; }
.ratio--square { --ratio: 100%; }
.ratio--tall   { --ratio: 133.33%; }
.ratio--banner { --ratio: 25%; }
.ratio--dark { background: var(--night); border-color: rgba(0, 229, 160, 0.3); }
.ratio__caption {
  position: absolute;
  left: 12px; bottom: 12px;
  z-index: 2;
  padding: 4px 10px;
  background: var(--night);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  border-radius: var(--radius);
}

/* 5.10 数据单元 */
.stat { display: grid; gap: 4px; }
.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}
.section--paper .stat__value,
.section--stack .stat__value { color: var(--pitch); }
.stat__label { font-size: 14px; color: var(--muted); letter-spacing: 0.02em; }
.section--dark .stat__label,
.section--pitch .stat__label,
.section--indigo .stat__label,
.section--wine .stat__label { color: rgba(255, 255, 255, 0.7); }

/* 5.11 筛选器 */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 28px;
}
.filter-btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--muted);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--card);
  cursor: pointer;
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.filter-btn:hover { transform: translateY(-2px); border-color: var(--pitch); color: var(--pitch); }
.filter-btn[aria-pressed="true"] { background: var(--pitch); border-color: var(--pitch); color: var(--cyan); }

/* 5.12 时间轴 / 档案条 */
.timeline {
  display: flex;
  gap: 0;
  overflow-x: auto;
  padding-top: 26px;
  border-top: 1px solid var(--rule);
  scrollbar-width: thin;
}
.timeline__item {
  position: relative;
  flex: 1 0 210px;
  padding-right: 28px;
}
.timeline__item::before {
  content: "";
  position: absolute;
  top: -27px; left: 0;
  width: 1px; height: 16px;
  background: var(--amber);
}
.timeline__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--amber);
  margin-bottom: 6px;
}
.timeline__title { font-size: 17px; font-weight: 700; margin-bottom: 4px; }
.timeline__text { font-size: 14px; color: var(--muted); }

/* 5.13 显现动画 */
@media (prefers-reduced-motion: no-preference) {
  [data-rise] {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
    will-change: opacity, transform;
  }
  [data-rise][data-shown] { opacity: 1; transform: none; }
}

/* 5.14 顶部阅读进度 */
.read-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 3px;
  z-index: 200;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* 5.15 段落落款 / 行动区 */
.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-top: 32px;
}
.note-mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 6. 刊头 ---------- */
.masthead {
  position: relative;
  z-index: 60;
  background: var(--pitch);
  color: #fff;
  border-bottom: 3px solid var(--cyan);
}
@media (min-width: 901px) {
  .masthead { position: sticky; top: 0; }
}

.masthead__bar {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  padding-block: 22px 12px;
  transition: padding var(--dur) var(--ease);
}

.masthead__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.72);
}
.masthead__tag--start { justify-self: start; }

.masthead__dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  flex: 0 0 auto;
}

.masthead__brand {
  grid-column: 2;
  display: block;
  text-align: center;
  padding: 4px 10px;
}
.masthead__wordmark {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: #fff;
  transition: font-size var(--dur) var(--ease);
}
.masthead__subline {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.masthead__side {
  grid-column: 3;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 14px;
}
.masthead__cta {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 16px;
  font-size: 14px;
  font-weight: 700;
  color: var(--night);
  background: var(--amber);
  border: 1px solid var(--amber);
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.masthead__cta:hover { transform: translateY(-2px); border-color: #fff; }

/* 6.1 移动导航按钮 */
.nav-toggle {
  position: absolute;
  top: 18px;
  right: var(--gutter);
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid rgba(0, 229, 160, 0.55);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.nav-toggle:hover { background: rgba(0, 229, 160, 0.12); border-color: var(--cyan); }
.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}
.nav-toggle__bars i {
  display: block;
  height: 1px;
  width: 100%;
  background: var(--cyan);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 6.2 主导航 */
.masthead__nav {
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  padding-bottom: 12px;
  transition: padding var(--dur) var(--ease);
}
.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px;
}
.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.82);
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav-list a:hover {
  color: #fff;
  border-color: rgba(0, 229, 160, 0.55);
  background: rgba(0, 229, 160, 0.1);
  transform: translateY(-2px);
}
.nav-list a[aria-current="page"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--night);
  font-weight: 700;
}

/* 6.3 入口带 */
.masthead__strip {
  background: var(--night);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}
.masthead__strip-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 54px;
  padding-block: 7px;
  white-space: nowrap;
  transition: min-height var(--dur) var(--ease);
}
.masthead__strip-label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--amber);
}
.entry-tabs {
  display: flex;
  gap: 8px;
}
.entry-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 14px;
  font-size: 14px;
  color: #fff;
  border: 1px solid rgba(255, 179, 0, 0.4);
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.entry-tab__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--amber);
}
.entry-tab:hover { transform: translateY(-2px); background: rgba(255, 179, 0, 0.14); border-color: var(--amber); }
.entry-tab:focus-visible { outline-color: var(--amber); }

/* 6.4 收缩态 */
.masthead[data-condensed] .masthead__bar { padding-block: 10px 6px; }
.masthead[data-condensed] .masthead__subline { display: none; }
.masthead[data-condensed] .masthead__wordmark { font-size: clamp(20px, 2vw, 26px); }
.masthead[data-condensed] .masthead__nav { padding-bottom: 8px; }
.masthead[data-condensed] .nav-list a { min-height: 36px; font-size: 14px; padding: 0 12px; }
.masthead[data-condensed] .masthead__strip-inner { min-height: 46px; }

/* ---------- 7. 页脚 ---------- */
.site-foot {
  background: var(--pitch);
  color: rgba(255, 255, 255, 0.78);
  margin-top: 0;
}
.site-foot__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px;
  padding-block: clamp(48px, 6vw, 72px) clamp(36px, 5vw, 56px);
}
.foot-col { display: grid; gap: 14px; align-content: start; }
.foot-col__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--amber);
}
.foot-col__brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: -0.02em;
  color: #fff;
}
.foot-col__text { font-size: 14px; line-height: 1.8; color: rgba(255, 255, 255, 0.72); }

.foot-facts { display: grid; gap: 10px; font-size: 13px; }
.foot-facts__row { display: grid; grid-template-columns: 76px minmax(0, 1fr); gap: 10px; }
.foot-facts dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--amber);
  padding-top: 3px;
}
.foot-facts dd { color: rgba(255, 255, 255, 0.74); word-break: break-all; }

/* 7.1 目录反馈色块 */
.feedback-block {
  position: relative;
  background: var(--magenta);
  color: #fff;
  padding: 22px 20px 20px;
  border-radius: var(--radius);
}
.feedback-block::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  pointer-events: none;
}
.feedback-block__head {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.feedback-block__text { font-size: 14px; line-height: 1.75; color: rgba(255, 255, 255, 0.92); }
.feedback-block__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 12px;
  padding: 0 18px;
  background: #fff;
  color: var(--magenta);
  font-size: 15px;
  font-weight: 700;
  border: 1px solid #fff;
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.feedback-block__link:hover { transform: translateY(-2px); background: var(--night); color: var(--cyan); border-color: var(--night); }
.feedback-block__link:focus-visible { outline-color: #fff; }
.feedback-block__timer {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin-top: 18px;
  padding-top: 12px;
  border-top: 1px dashed rgba(255, 255, 255, 0.45);
}
.feedback-block__timer-label { font-size: 12px; letter-spacing: 0.06em; color: rgba(255, 255, 255, 0.85); }
.feedback-block__timer-value {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #fff;
}
.feedback-block__timer-value.tick { transform: translateY(1px); transition: transform 120ms var(--ease); }

/* 7.2 索引与条款 */
.index-list { display: grid; gap: 2px; }
.index-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 34px;
  padding: 6px 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.78);
  border-bottom: 1px dashed rgba(255, 255, 255, 0.12);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.index-list a:hover { color: var(--cyan); border-color: rgba(0, 229, 160, 0.5); }
.index-list--plain { margin-top: 6px; }
.index-list--plain a { border-bottom: 0; min-height: 30px; padding: 4px 0; }
.index-no {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--amber);
}
.foot-icp { font-size: 13px; color: rgba(255, 255, 255, 0.72); }
.foot-addr { font-size: 13px; line-height: 1.75; color: rgba(255, 255, 255, 0.6); }

/* 7.3 底栏 */
.site-foot__bottom {
  background: var(--night);
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}
.site-foot__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: center;
  justify-content: space-between;
  padding-block: 18px;
}
.site-foot__legal,
.site-foot__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.58);
}

/* ---------- 8. 响应式 ---------- */
@media (max-width: 1080px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-foot__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
}

@media (max-width: 900px) {
  :root { --gutter: 20px; }

  body { font-size: 16px; line-height: 1.82; }

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

  .masthead__side { display: none; }

  .masthead__bar {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    padding-block: 18px 12px;
  }
  .masthead__wordmark { font-size: clamp(22px, 6.4vw, 30px); }
  .masthead__subline { font-size: 11px; letter-spacing: 0.12em; margin-top: 6px; }
  .masthead__tag--start { font-size: 11px; }

  .masthead__nav { display: none; padding-bottom: 0; }
  .masthead__nav[data-open] { display: block; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; padding-block: 10px; }
  .nav-list a {
    width: 100%;
    min-height: 48px;
    padding: 0 18px;
    border: 0;
    border-left: 2px solid transparent;
    background: rgba(255, 255, 255, 0.03);
  }
  .nav-list a:hover { transform: none; border-left-color: var(--cyan); }
  .nav-list a[aria-current="page"] { border-left-color: var(--amber); }

  .masthead__strip-inner { gap: 12px; min-height: 50px; }
  .masthead__strip-label { letter-spacing: 0.14em; }

  .grid--2, .grid--3, .grid--4, .grid--7-5, .grid--8-4 { grid-template-columns: 1fr; }
  .sec-head { grid-template-columns: 1fr; gap: 8px; }
  .sec-num { padding-top: 0; }

  .card { padding: 20px; }
  .card--stack { box-shadow: 4px 4px 0 var(--stack), 5px 5px 0 var(--rule-soft); }
  .timeline__item { flex: 0 0 78%; }
}

@media (max-width: 620px) {
  .site-foot__grid { grid-template-columns: 1fr; gap: 30px; }
  .site-foot__bottom-inner { flex-direction: column; align-items: flex-start; }
  .foot-facts__row { grid-template-columns: 68px minmax(0, 1fr); }
  .action-row .btn { width: 100%; }
}

@media (max-width: 380px) {
  .masthead__wordmark { font-size: 22px; }
  .entry-tab { padding: 0 11px; }
}

/* ---------- 9. 无障碍与减弱动效 ---------- */
@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;
  }
  .masthead__strip { scroll-behavior: auto; }
}