/* =========================================================
   江南体育 · 共享样式表  /assets/site.css
   结构：侧边品牌轨道 + 居中刊头导航 + 夜绿页脚
   ========================================================= */

/* ---------- 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, ul, ol, li, figure, blockquote, dl, dd, hr {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

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

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

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

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

hr {
  border: 0;
  border-top: 1px solid rgba(28, 26, 23, .14);
}

/* ---------- 2. 设计令牌 ---------- */
:root {
  --paper: #F4F0E6;
  --ink-green: #123B32;
  --mist-gray: #4C6B66;
  --panel: #E1E6E0;
  --ink: #1C1A17;
  --cyan: #35E0C8;
  --cyan-deep: #0E6B5E;
  --orange: #E8752B;
  --orange-deep: #C75E1B;
  --clay: #B23A2E;
  --fog: #8C978F;
  --night: #0B241F;

  --line: rgba(28, 26, 23, .14);
  --line-strong: rgba(28, 26, 23, .30);
  --line-invert: rgba(244, 240, 230, .16);
  --ink-invert: rgba(244, 240, 230, .80);

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, "Times New Roman", serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", monospace;

  --rail-w: 84px;
  --shell: 1180px;
  --gap: 20px;

  --t-fast: 160ms ease-out;
  --t-mid: 240ms ease-out;

  --z-rail: 90;
  --z-header: 40;
  --z-progress: 120;
  --z-skip: 200;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  padding-left: var(--rail-w);
  background-color: var(--paper);
  background-image:
    linear-gradient(90deg, rgba(18, 59, 50, .042) 1px, transparent 1px),
    linear-gradient(rgba(18, 59, 50, .042) 1px, transparent 1px);
  background-size: 72px 72px;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--orange);
  color: #20160c;
}

:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* ---------- 4. 通用工具 ---------- */
.container {
  width: min(var(--shell), calc(100% - 48px));
  margin-inline: auto;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .04em;
}

.label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist-gray);
}

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

/* ---------- 5. 跳转链接与阅读进度 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: var(--z-skip);
  padding: 12px 22px;
  background: var(--ink-green);
  color: var(--paper);
  font-size: 14px;
  letter-spacing: .08em;
  transform: translate(-50%, -160%);
  transition: transform var(--t-fast);
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--z-progress);
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--orange), var(--clay));
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

/* ---------- 6. 侧边品牌轨道 ---------- */
.site-header {
  position: relative;
  z-index: var(--z-header);
  background: var(--paper);
  border-bottom: 1px solid var(--line-strong);
}

.brand-rail {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: var(--z-rail);
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 0 26px;
  background: var(--ink-green);
  border-right: 1px solid rgba(244, 240, 230, .14);
}

.rail-logo {
  writing-mode: vertical-rl;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 15px;
  letter-spacing: .30em;
  color: var(--paper);
  transition: color var(--t-fast);
}

.rail-logo:hover {
  color: var(--cyan);
}

.rail-marker {
  writing-mode: vertical-rl;
  max-height: 34vh;
  margin-top: 20px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .32em;
  color: var(--cyan);
}

.rail-rule {
  flex: 1 1 auto;
  width: 1px;
  min-height: 40px;
  margin: 20px 0;
  background: linear-gradient(180deg,
    var(--orange) 0%,
    var(--cyan) 55%,
    rgba(244, 240, 230, .12) 100%);
}

.rail-meta {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .22em;
  color: rgba(244, 240, 230, .5);
}

/* ---------- 7. 居中刊头 ---------- */
.masthead {
  width: min(var(--shell), calc(100% - 48px));
  margin-inline: auto;
  padding: 26px 0 0;
}

.masthead__kicker {
  padding-bottom: 10px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .32em;
  color: var(--mist-gray);
}

.masthead__brand {
  display: block;
  text-align: center;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(2rem, 5.6vw, 3.5rem);
  line-height: 1.05;
  letter-spacing: .12em;
  color: var(--ink-green);
}

.masthead__rule {
  position: relative;
  display: block;
  height: 1px;
  margin-top: 18px;
  background: var(--line-strong);
}

.masthead__rule::after {
  content: "";
  position: absolute;
  left: 0;
  top: -2px;
  width: 28px;
  height: 5px;
  background: var(--orange);
}

.nav-toggle {
  display: none;
  width: fit-content;
  margin: 16px auto 0;
  padding: 10px 18px;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--ink-green);
  color: var(--ink-green);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  transition: background-color var(--t-fast), color var(--t-fast);
}

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

.nav-toggle__bars {
  display: block;
  width: 16px;
  height: 9px;
  border-top: 1px solid currentColor;
  border-bottom: 1px solid currentColor;
}

.masthead__nav {
  border-bottom: 1px solid var(--line-strong);
}

.masthead__nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
}

.masthead__nav li {
  position: relative;
}

.masthead__nav li + li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: var(--line);
}

.masthead__nav a {
  position: relative;
  display: block;
  padding: 13px 20px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--ink);
  transition: color var(--t-fast);
}

.masthead__nav a::before {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 0;
  height: 3px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-fast);
}

.masthead__nav a:hover {
  color: var(--ink-green);
}

.masthead__nav a:hover::before {
  transform: scaleX(1);
}

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

.masthead__nav a[aria-current="page"]::before {
  transform: scaleX(1);
  background: var(--clay);
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 10;
  margin-top: clamp(48px, 6vw, 88px);
  overflow: hidden;
  background: var(--night);
  color: var(--paper);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(53, 224, 200, .07) 1px, transparent 1px),
    linear-gradient(rgba(53, 224, 200, .07) 1px, transparent 1px);
  background-size: 84px 84px;
}

.footer-shell {
  position: relative;
  z-index: 1;
  width: min(var(--shell), calc(100% - 48px));
  margin-inline: auto;
  padding-top: clamp(40px, 6vw, 72px);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.4fr;
  gap: clamp(24px, 4vw, 48px);
}

.footer-brand__name {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  letter-spacing: .12em;
  color: var(--paper);
}

.footer-brand__line {
  max-width: 30em;
  margin-top: 12px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-invert);
}

.footer-col__title {
  padding-bottom: 10px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line-invert);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--cyan);
}

.footer-col li + li {
  margin-top: 11px;
}

.footer-col a {
  display: inline-block;
  font-size: 14px;
  color: var(--ink-invert);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

.footer-text {
  display: block;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(244, 240, 230, .72);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 28px;
  margin-top: clamp(32px, 5vw, 56px);
  padding: 18px 0 26px;
  border-top: 1px solid var(--line-invert);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: rgba(244, 240, 230, .55);
}

.footer-bottom__legal,
.footer-bottom__meta {
  font: inherit;
  letter-spacing: inherit;
}

/* ---------- 9. 区块与标题 ---------- */
.section {
  padding-block: clamp(40px, 6vw, 76px);
}

.section--tint {
  background: var(--panel);
}

.section--night {
  background: var(--night);
  color: var(--paper);
}

.section--night .section-head {
  border-bottom-color: var(--line-invert);
}

.section--night .section-head h2 {
  color: var(--paper);
}

.section--night .section-head p {
  color: rgba(244, 240, 230, .68);
}

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

.section-head__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--clay);
}

.section-head h2 {
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.35rem, 2.4vw, 1.9rem);
  line-height: 1.3;
  letter-spacing: .02em;
  color: var(--ink-green);
}

.section-head p {
  max-width: 44ch;
  margin-left: auto;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist-gray);
}

/* ---------- 10. 网格 ---------- */
.grid {
  display: grid;
  gap: var(--gap);
}

.grid--split {
  grid-template-columns: 7fr 5fr;
}

.grid--halves {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--thirds {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

/* ---------- 11. 卡片与标签 ---------- */
.card {
  position: relative;
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
}

.card--panel {
  background: var(--panel);
  border-color: transparent;
}

.card--night {
  background: rgba(11, 36, 31, .86);
  border-color: var(--line-invert);
  color: var(--paper);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist-gray);
  background: transparent;
}

.tag--clay {
  color: var(--clay);
  border-color: var(--clay);
}

.tag--orange {
  color: #8a3f0f;
  border-color: var(--orange);
  background: rgba(232, 117, 43, .12);
}

.tag--cyan {
  color: var(--cyan-deep);
  border-color: var(--cyan);
  background: rgba(53, 224, 200, .16);
}

/* ---------- 12. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid var(--ink-green);
  background: transparent;
  color: var(--ink-green);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .06em;
  transition: background-color var(--t-fast), color var(--t-fast), border-color var(--t-fast);
}

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

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: #20160c;
  font-weight: 700;
}

.btn--primary:hover {
  background: var(--orange-deep);
  border-color: var(--orange-deep);
  color: #150d05;
}

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--mist-gray);
}

/* ---------- 13. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  padding-top: 24px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--mist-gray);
}

.breadcrumb li {
  display: flex;
  align-items: center;
}

.breadcrumb li + li::before {
  content: "／";
  margin: 0 8px;
  color: var(--fog);
}

.breadcrumb a {
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.breadcrumb a:hover {
  color: var(--ink-green);
  border-bottom-color: var(--ink-green);
}

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

/* ---------- 14. 正文 ---------- */
.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink);
}

.prose h2,
.prose h3 {
  margin-top: 1.6em;
  margin-bottom: .5em;
  font-family: var(--font-serif);
  line-height: 1.35;
  color: var(--ink-green);
}

.prose h2 {
  font-size: 1.5rem;
  font-weight: 900;
}

.prose h3 {
  font-size: 1.2rem;
  font-weight: 700;
}

.prose p + p {
  margin-top: 1em;
}

.prose ul,
.prose ol {
  margin: 1em 0;
  padding-left: 1.3em;
}

.prose ul li {
  list-style: square;
}

.prose ol li {
  list-style: decimal;
}

.prose li + li {
  margin-top: .35em;
}

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

.prose strong {
  font-weight: 700;
}

/* ---------- 15. 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background-color: var(--ink-green);
  background-image:
    linear-gradient(115deg, rgba(53, 224, 200, .22) 0%, rgba(232, 117, 43, .14) 58%, rgba(11, 36, 31, 0) 100%),
    linear-gradient(90deg, rgba(244, 240, 230, .08) 1px, transparent 1px),
    linear-gradient(rgba(244, 240, 230, .08) 1px, transparent 1px);
  background-size: auto, 32px 32px, 32px 32px;
}

.media-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

.media-frame--square {
  aspect-ratio: 1 / 1;
}

.media-frame--tall {
  aspect-ratio: 3 / 4;
}

.media-frame--blur img {
  filter: blur(2px) saturate(.85);
}

/* ---------- 16. 分段切换 ---------- */
.tabs {
  display: block;
}

.tabs__list {
  display: flex;
  overflow-x: auto;
  border-bottom: 1px solid var(--line-strong);
  scrollbar-width: thin;
}

.tabs__tab {
  flex: 0 0 auto;
  margin-bottom: -1px;
  padding: 12px 20px;
  border-bottom: 3px solid transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mist-gray);
  transition: color var(--t-fast), border-color var(--t-fast);
}

.tabs__tab:hover {
  color: var(--ink-green);
}

.tabs__tab[aria-selected="true"] {
  color: var(--ink-green);
  font-weight: 600;
  border-bottom-color: var(--orange);
}

.tabs__panel {
  padding-top: 24px;
}

.tabs__panel[hidden] {
  display: none;
}

/* ---------- 17. 折叠面板 ---------- */
.accordion {
  border-top: 1px solid var(--line-strong);
}

.accordion__item {
  border-bottom: 1px solid var(--line);
}

.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 18px 4px;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-green);
  transition: color var(--t-fast);
}

.accordion__trigger:hover {
  color: var(--clay);
}

.accordion__trigger::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--mist-gray);
}

.accordion__trigger[aria-expanded="true"]::after {
  content: "−";
  color: var(--orange);
}

.accordion__panel {
  padding: 0 4px 20px;
}

.accordion__panel[hidden] {
  display: none;
}

/* ---------- 18. 索引标签带 ---------- */
.index-strip {
  display: flex;
  overflow-x: auto;
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.index-strip__item {
  flex: 0 0 auto;
  padding: 11px 18px;
  border-right: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--mist-gray);
  white-space: nowrap;
  transition: background-color var(--t-fast), color var(--t-fast);
}

.index-strip__item:hover {
  color: var(--ink-green);
}

.index-strip__item[aria-current="true"] {
  background: var(--ink-green);
  color: var(--paper);
}

/* ---------- 19. 显现动效 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 420ms ease-out, transform 420ms ease-out;
}

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

/* ---------- 20. 响应式 ---------- */
@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 1000px) {
  .grid--split,
  .grid--thirds {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-12 {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .section-head p {
    margin-left: 0;
  }
}

@media (max-width: 900px) {
  body {
    padding-left: 0;
  }

  .brand-rail {
    position: static;
    width: auto;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 9px 20px;
    border-right: 0;
    border-bottom: 1px solid rgba(244, 240, 230, .14);
  }

  .rail-logo {
    writing-mode: horizontal-tb;
    font-size: 13px;
    letter-spacing: .22em;
  }

  .rail-marker {
    writing-mode: horizontal-tb;
    max-height: none;
    margin-top: 0;
    font-size: 10.5px;
    letter-spacing: .18em;
  }

  .rail-rule {
    display: none;
  }

  .rail-meta {
    writing-mode: horizontal-tb;
    font-size: 10px;
    letter-spacing: .16em;
  }

  .masthead {
    width: calc(100% - 36px);
    padding-top: 20px;
  }

  .masthead__kicker {
    font-size: 10px;
    letter-spacing: .22em;
  }

  .masthead__brand {
    font-size: clamp(1.9rem, 9vw, 2.6rem);
  }

  .nav-toggle {
    display: flex;
  }

  .masthead__nav {
    display: none;
    margin-top: 14px;
  }

  .masthead__nav[data-open] {
    display: block;
  }

  .masthead__nav ul {
    flex-direction: column;
    counter-reset: navidx;
  }

  .masthead__nav li {
    counter-increment: navidx;
  }

  .masthead__nav li + li::before {
    display: none;
  }

  .masthead__nav a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 4px;
    border-bottom: 1px solid var(--line);
    font-size: 15px;
  }

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

  .masthead__nav a::before {
    display: none;
  }

  .masthead__nav a::after {
    content: counter(navidx, decimal-leading-zero);
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .1em;
    color: var(--fog);
  }

  .masthead__nav a[aria-current="page"] {
    padding-left: 12px;
    background: var(--panel);
  }

  .masthead__nav a[aria-current="page"]::after {
    color: var(--clay);
  }
}

@media (max-width: 640px) {
  .container,
  .masthead,
  .footer-shell {
    width: calc(100% - 36px);
  }

  .grid--split,
  .grid--halves,
  .grid--thirds,
  .grid-12 {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .footer-bottom {
    font-size: 11px;
  }
}

/* ---------- 21. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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

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