/* ============================================================
   江南体育看台 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   ============================================================ */

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

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

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

ul, ol { list-style: none; }

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

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

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

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

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩体系 */
  --jn-night: #0A1A29;
  --jn-stand: #122E45;
  --jn-line: #1F4A63;
  --jn-green: #35D6A4;
  --jn-mint: #B6F5E2;
  --jn-orange: #FF5C38;
  --jn-paper: #F7F5EE;
  --jn-mist: #9DB2C2;
  --jn-craft: #E8DFCB;
  --jn-warn: #FFC94A;

  /* 字体 */
  --jn-font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --jn-font-body: var(--jn-font-display);
  --jn-font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 版式 */
  --jn-shell: 1280px;
  --jn-gutter: clamp(16px, 4vw, 48px);
  --jn-radius: 6px;
  --jn-radius-lg: 18px;
  --jn-step: clamp(28px, 5vw, 64px);

  /* 蓝图网格 */
  --jn-grid-lines:
    repeating-linear-gradient(90deg, rgba(31, 74, 99, .55) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(31, 74, 99, .40) 0 1px, transparent 1px 72px);
}

/* ---------- 3. 基础排版 ---------- */
html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  background-color: var(--jn-night);
  background-image:
    radial-gradient(120% 90% at 82% -10%, rgba(53, 214, 164, .12), transparent 62%),
    radial-gradient(90% 70% at 0% 4%, rgba(255, 92, 56, .10), transparent 58%),
    repeating-linear-gradient(90deg, rgba(31, 74, 99, .30) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(31, 74, 99, .22) 0 1px, transparent 1px 88px);
  color: var(--jn-paper);
  font-family: var(--jn-font-body);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--jn-font-display);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.01em;
}

p { max-width: 68ch; }

[id] { scroll-margin-block-start: 18px; }
#main-content { scroll-margin-block-start: 12px; }

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

/* ---------- 4. 页头 ---------- */
.jn-header {
  position: relative;
  z-index: 60;
  color: var(--jn-paper);
  background:
    radial-gradient(110% 170% at 88% -30%, rgba(53, 214, 164, .20), transparent 62%),
    linear-gradient(180deg, #0C2233 0%, var(--jn-night) 100%);
  border-bottom: 1px solid var(--jn-line);
  box-shadow: 0 22px 46px -34px rgba(0, 0, 0, .95);
}

.jn-header::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 2px;
  background: linear-gradient(90deg,
    var(--jn-green) 0 16%,
    transparent 16% 20%,
    var(--jn-orange) 20% 34%,
    transparent 34% 100%);
  opacity: .9;
  pointer-events: none;
}

/* skip link */
.jn-skip {
  position: absolute;
  left: 14px;
  top: -72px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--jn-green);
  color: var(--jn-night);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: .06em;
  border-radius: 0 0 6px 6px;
  transition: top .18s ease;
}
.jn-skip:focus { top: 0; }

/* 状态带 */
.jn-status {
  overflow: hidden;
  border-bottom: 1px dashed rgba(31, 74, 99, .95);
  background: linear-gradient(90deg, rgba(18, 46, 69, .92), rgba(10, 26, 41, .35));
}

.jn-status__track {
  display: flex;
  width: max-content;
  animation: jn-ticker 46s linear infinite;
}
.jn-status:hover .jn-status__track,
.jn-status:focus-within .jn-status__track { animation-play-state: paused; }

.jn-status__group {
  display: flex;
  align-items: center;
  gap: clamp(18px, 3vw, 46px);
  padding: 7px clamp(14px, 3vw, 34px);
}

.jn-status__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--jn-font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--jn-mist);
  white-space: nowrap;
}

.jn-status__dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--jn-green);
  box-shadow: 0 0 0 3px rgba(53, 214, 164, .18);
  flex: none;
}
.jn-status__item:nth-child(2) .jn-status__dot {
  background: var(--jn-warn);
  box-shadow: 0 0 0 3px rgba(255, 201, 74, .18);
}
.jn-status__item:nth-child(3) .jn-status__dot {
  background: var(--jn-orange);
  box-shadow: 0 0 0 3px rgba(255, 92, 56, .2);
}

@keyframes jn-ticker {
  from { transform: translate3d(0, 0, 0); }
  to   { transform: translate3d(-50%, 0, 0); }
}

/* 刊头 */
.jn-masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 18px;
  max-width: var(--jn-shell);
  margin-inline: auto;
  padding: clamp(12px, 2vw, 22px) var(--jn-gutter);
  background-image: repeating-linear-gradient(90deg, rgba(31, 74, 99, .30) 0 1px, transparent 1px 88px);
}

.jn-masthead__rail {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.jn-masthead__rail--right { justify-content: flex-end; }

.jn-masthead__kicker {
  color: var(--jn-mist);
  letter-spacing: .22em;
  font-size: 11px;
  white-space: nowrap;
}

.jn-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  justify-self: center;
  min-width: 0;
}

.jn-brand__mark {
  width: 38px; height: 38px;
  flex: none;
  border: 1px solid rgba(53, 214, 164, .55);
  background: linear-gradient(135deg,
    var(--jn-green) 0 46%,
    #0A1A29 46% 54%,
    var(--jn-orange) 54% 100%);
  box-shadow: inset 0 0 0 1px rgba(10, 26, 41, .9), 0 10px 22px -14px var(--jn-green);
}

.jn-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1;
  min-width: 0;
}

.jn-brand__name {
  font-size: clamp(1.3rem, 2.6vw, 2rem);
  font-weight: 900;
  letter-spacing: .16em;
  color: var(--jn-paper);
  transform: skew(-4deg);
  text-shadow: 1px 0 0 rgba(182, 245, 226, .32);
  white-space: nowrap;
}

.jn-brand__sub {
  margin-top: 7px;
  font-family: var(--jn-font-mono);
  font-size: 10px;
  letter-spacing: .3em;
  color: var(--jn-mist);
  text-transform: uppercase;
  white-space: nowrap;
}

/* 按钮 */
.jn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: .62rem 1.15rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .08em;
  white-space: nowrap;
  transition: transform .18s ease, background-color .18s ease, color .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.jn-btn--action {
  background: var(--jn-orange);
  color: var(--jn-night);
  box-shadow: 0 12px 26px -16px rgba(255, 92, 56, .95);
}
.jn-btn--action:hover { background: #ff7454; transform: translateY(-1px); }
.jn-btn--action:active { transform: translateY(0); }

.jn-btn--ghost {
  border-color: rgba(53, 214, 164, .5);
  background: rgba(53, 214, 164, .08);
  color: var(--jn-mint);
}
.jn-btn--ghost:hover { background: rgba(53, 214, 164, .18); border-color: var(--jn-green); }

/* 汉堡 */
.jn-nav-toggle {
  display: none;
  width: 46px; height: 40px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(53, 214, 164, .42);
  border-radius: 6px;
  background: rgba(18, 46, 69, .6);
  transition: border-color .18s ease, background-color .18s ease;
}
.jn-nav-toggle:hover { border-color: var(--jn-green); background: rgba(53, 214, 164, .12); }

.jn-nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px; height: 2px;
  background: var(--jn-mint);
  transition: background-color .2s ease;
}
.jn-nav-toggle__bars::before,
.jn-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px; height: 2px;
  background: var(--jn-mint);
  transition: transform .22s ease, top .22s ease;
}
.jn-nav-toggle__bars::before { top: -6px; }
.jn-nav-toggle__bars::after { top: 6px; }

.jn-header[data-open="true"] .jn-nav-toggle__bars { background: transparent; }
.jn-header[data-open="true"] .jn-nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.jn-header[data-open="true"] .jn-nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* 栏目行 */
.jn-nav {
  border-top: 1px solid rgba(31, 74, 99, .95);
  border-bottom: 1px solid rgba(31, 74, 99, .75);
  background: rgba(10, 26, 41, .55);
}

.jn-nav__list {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  max-width: var(--jn-shell);
  margin-inline: auto;
  padding-inline: var(--jn-gutter);
}

.jn-nav__item { min-width: 0; display: flex; }

.jn-nav__link {
  display: flex;
  flex: 1;
  align-items: baseline;
  justify-content: center;
  gap: 8px;
  padding: 14px 6px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .08em;
  color: rgba(247, 245, 238, .82);
  border-bottom: 2px solid transparent;
  transition: color .16s ease, background-color .16s ease, border-color .16s ease;
}
.jn-nav__link:hover { color: var(--jn-mint); background: rgba(53, 214, 164, .08); }

.jn-nav__index {
  font-family: var(--jn-font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: rgba(157, 178, 194, .8);
  transition: color .16s ease;
}
.jn-nav__link:hover .jn-nav__index { color: var(--jn-green); }

.jn-nav__link[aria-current="page"] {
  color: var(--jn-paper);
  border-bottom-color: var(--jn-orange);
  background: linear-gradient(180deg, rgba(255, 92, 56, 0), rgba(255, 92, 56, .20));
}
.jn-nav__link[aria-current="page"] .jn-nav__index { color: var(--jn-orange); }

/* 快捷条 */
.jn-quick {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  max-width: var(--jn-shell);
  margin-inline: auto;
  padding: 10px var(--jn-gutter) 14px;
}

.jn-quick__label {
  font-family: var(--jn-font-mono);
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--jn-mist);
  border: 1px solid rgba(31, 74, 99, .95);
  border-radius: 3px;
  padding: 2px 8px;
  max-width: none;
  flex: none;
}

.jn-quick__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.jn-quick__link {
  display: inline-block;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--jn-mint);
  padding: 4px 12px;
  border: 1px dashed rgba(53, 214, 164, .42);
  border-radius: 999px;
  transition: background-color .16s ease, border-color .16s ease, border-style .16s ease, color .16s ease;
}
.jn-quick__link:hover {
  background: rgba(53, 214, 164, .16);
  border-style: solid;
  border-color: var(--jn-green);
  color: var(--jn-paper);
}

/* ---------- 5. 页脚 ---------- */
.jn-footer {
  position: relative;
  margin-top: clamp(40px, 7vw, 92px);
  overflow: hidden;
  color: var(--jn-paper);
  background:
    radial-gradient(90% 120% at 12% 0%, rgba(53, 214, 164, .14), transparent 60%),
    linear-gradient(180deg, var(--jn-stand) 0%, #0A1A29 58%);
  border-top: 1px solid var(--jn-line);
}

.jn-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--jn-grid-lines);
  background-size: 80px 80px;
  opacity: .30;
  pointer-events: none;
}

.jn-footer::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: repeating-linear-gradient(90deg,
    var(--jn-green) 0 28px,
    var(--jn-orange) 28px 56px,
    var(--jn-line) 56px 84px);
  opacity: .85;
}

.jn-foot__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: clamp(20px, 3vw, 44px);
  max-width: var(--jn-shell);
  margin-inline: auto;
  padding: clamp(36px, 5vw, 68px) var(--jn-gutter) clamp(20px, 3vw, 32px);
}

.jn-foot__brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}

.jn-foot__mark {
  font-size: clamp(1.2rem, 2vw, 1.6rem);
  font-weight: 900;
  letter-spacing: .14em;
  color: var(--jn-paper);
  transform: skew(-4deg);
  max-width: none;
  text-shadow: 1px 0 0 rgba(182, 245, 226, .3);
}

.jn-foot__tagline {
  font-size: 15px;
  line-height: 1.85;
  color: var(--jn-mint);
  max-width: 20ch;
}

.jn-foot__note {
  font-family: var(--jn-font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--jn-mist);
  max-width: 30ch;
}

.jn-foot__col { min-width: 0; }

.jn-foot__col-title {
  font-family: var(--jn-font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--jn-green);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(31, 74, 99, .95);
}

.jn-foot__links {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.jn-foot__link {
  display: inline-block;
  font-size: 14px;
  color: rgba(247, 245, 238, .78);
  transition: color .16s ease, transform .16s ease;
}
.jn-foot__link:hover { color: var(--jn-mint); transform: translateX(3px); }

.jn-foot__base {
  position: relative;
  max-width: var(--jn-shell);
  margin-inline: auto;
  padding: 20px var(--jn-gutter) 30px;
  border-top: 1px solid rgba(31, 74, 99, .85);
  display: grid;
  gap: 6px;
  font-family: var(--jn-font-mono);
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--jn-mist);
}

.jn-foot__contact { color: rgba(247, 245, 238, .92); max-width: none; }
.jn-foot__address { max-width: none; }

.jn-foot__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  align-items: center;
  justify-content: space-between;
  margin-top: 6px;
}

.jn-foot__icp { color: var(--jn-mist); }
.jn-foot__copy { color: rgba(157, 178, 194, .85); }

/* ---------- 6. 通用布局与组件 ---------- */
.jn-shell {
  width: 100%;
  max-width: var(--jn-shell);
  margin-inline: auto;
  padding-inline: var(--jn-gutter);
}

.jn-section { padding-block: clamp(32px, 5.5vw, 76px); }

.jn-grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 30px);
  grid-template-columns: 1fr;
}
.jn-grid--2 { grid-template-columns: 1fr; }
.jn-grid--3 { grid-template-columns: 1fr; }

.jn-stack { display: flex; flex-direction: column; gap: clamp(12px, 1.8vw, 22px); }
.jn-cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; }

.jn-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--jn-font-mono);
  font-size: 12px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--jn-green);
}
.jn-eyebrow::before {
  content: "";
  width: 26px; height: 2px;
  background: linear-gradient(90deg, var(--jn-green), transparent);
  flex: none;
}

.jn-display {
  font-size: clamp(2.4rem, 6vw, 5.6rem);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -.02em;
  color: var(--jn-paper);
  transform: skew(-4deg);
  text-shadow: 1px 0 0 rgba(182, 245, 226, .3);
  max-width: 14ch;
}

.jn-h2 { font-size: clamp(1.55rem, 3vw, 2.4rem); font-weight: 900; }
.jn-h3 { font-size: clamp(1.1rem, 1.6vw, 1.4rem); font-weight: 800; }

.jn-lede {
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  line-height: 1.8;
  color: var(--jn-mist);
  max-width: 64ch;
}

.jn-text { line-height: 1.8; max-width: 66ch; }

.jn-meta {
  font-family: var(--jn-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--jn-mist);
  font-variant-numeric: tabular-nums;
}

.jn-mono {
  font-family: var(--jn-font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  font-variant-numeric: tabular-nums;
}

.jn-rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--jn-line), rgba(31, 74, 99, 0));
}

/* 分区面板 */
.jn-panel {
  padding-block: clamp(28px, 5vw, 64px);
  border-block: 1px solid rgba(31, 74, 99, .9);
}
.jn-panel--deep { background: linear-gradient(180deg, rgba(18, 46, 69, .92), rgba(18, 46, 69, .6)); }

.jn-panel--paper {
  background: var(--jn-paper);
  color: #0A1A29;
  border-block-color: rgba(232, 223, 203, .9);
}
.jn-panel--paper .jn-lede,
.jn-panel--paper .jn-text { color: #3C5364; }
.jn-panel--paper .jn-meta { color: #59707F; }
.jn-panel--paper .jn-rule { background: linear-gradient(90deg, rgba(10, 26, 41, .25), transparent); }

/* 卡片 */
.jn-card {
  position: relative;
  overflow: hidden;
  padding: clamp(16px, 2vw, 26px);
  border: 1px solid rgba(31, 74, 99, .95);
  border-radius: var(--jn-radius);
  background: linear-gradient(160deg, rgba(18, 46, 69, .96), rgba(10, 26, 41, .96));
  box-shadow: 0 24px 44px -38px rgba(0, 0, 0, .95);
}
.jn-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--jn-green), rgba(53, 214, 164, 0));
}

/* 状态提示条 */
.jn-statusbar {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  border-left: 3px solid var(--jn-warn);
  border-radius: 0 var(--jn-radius) var(--jn-radius) 0;
  background: rgba(255, 201, 74, .12);
  color: var(--jn-paper);
  font-size: 14px;
  line-height: 1.7;
}
.jn-statusbar--ok { border-left-color: var(--jn-green); background: rgba(53, 214, 164, .12); }
.jn-statusbar--alert { border-left-color: var(--jn-orange); background: rgba(255, 92, 56, .14); }

/* 标签 */
.jn-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid rgba(53, 214, 164, .42);
  border-radius: 3px;
  background: rgba(53, 214, 164, .1);
  color: var(--jn-mint);
  font-family: var(--jn-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}
.jn-tag--craft {
  border-color: rgba(232, 223, 203, .55);
  background: var(--jn-craft);
  color: var(--jn-night);
}
.jn-tag--warn {
  border-color: rgba(255, 201, 74, .55);
  background: rgba(255, 201, 74, .16);
  color: var(--jn-warn);
}

/* 面包屑 */
.jn-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--jn-font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--jn-mist);
}
.jn-breadcrumb__link { color: var(--jn-mint); transition: color .16s ease; }
.jn-breadcrumb__link:hover { color: var(--jn-green); }
.jn-breadcrumb__sep { color: rgba(157, 178, 194, .6); }
.jn-breadcrumb [aria-current="page"] { color: var(--jn-paper); }

/* 图片容器 */
.jn-media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(31, 74, 99, .95);
  border-radius: var(--jn-radius-lg) 4px var(--jn-radius-lg) 4px;
  background:
    radial-gradient(120% 100% at 20% 0%, rgba(53, 214, 164, .22), transparent 62%),
    linear-gradient(150deg, #122E45 0%, #0A1A29 60%, #1F4A63 100%);
}
.jn-media img,
.jn-media video { width: 100%; height: 100%; object-fit: cover; }
.jn-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--jn-grid-lines);
  background-size: 72px 72px;
  opacity: .32;
  pointer-events: none;
}
.jn-media--wide { aspect-ratio: 21 / 9; }
.jn-media--square { aspect-ratio: 1 / 1; }
.jn-media--tall { aspect-ratio: 3 / 4; }

.jn-media__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 2;
  padding: 10px 14px;
  font-family: var(--jn-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--jn-paper);
  background: linear-gradient(180deg, transparent, rgba(10, 26, 41, .88));
}

/* 章节索引 */
.jn-index {
  position: sticky;
  top: 18px;
  padding-left: 14px;
  border-left: 2px solid rgba(31, 74, 99, .95);
}
.jn-index__title {
  font-family: var(--jn-font-mono);
  font-size: 11px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--jn-green);
  margin-bottom: 10px;
}
.jn-index__list { display: flex; flex-direction: column; gap: 2px; }
.jn-index__link {
  display: block;
  padding: 5px 8px;
  border-radius: 3px;
  font-size: 13px;
  color: var(--jn-mist);
  transition: color .16s ease, background-color .16s ease;
}
.jn-index__link:hover { color: var(--jn-paper); background: rgba(53, 214, 164, .1); }
.jn-index__link[aria-current="true"] {
  color: var(--jn-night);
  background: var(--jn-green);
  font-weight: 700;
}

/* 滚动进度与返回顶部（JS 生成） */
.jn-progress {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  height: 3px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--jn-green), var(--jn-mint) 58%, var(--jn-orange));
  pointer-events: none;
  transition: transform .12s linear;
}

.jn-totop {
  position: fixed;
  right: clamp(14px, 3vw, 34px);
  bottom: clamp(14px, 3vw, 34px);
  z-index: 110;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid rgba(53, 214, 164, .5);
  border-radius: 999px;
  background: rgba(10, 26, 41, .94);
  color: var(--jn-mint);
  font-size: 13px;
  letter-spacing: .08em;
  box-shadow: 0 20px 34px -24px rgba(0, 0, 0, .95);
  opacity: 0;
  transform: translateY(14px);
  pointer-events: none;
  transition: opacity .22s ease, transform .22s ease, border-color .2s ease;
}
.jn-totop[data-visible="true"] {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}
.jn-totop:hover { border-color: var(--jn-green); color: var(--jn-paper); }

/* 渐显 */
.jn-reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .45s ease, transform .45s ease;
}
.jn-reveal[data-shown="true"] { opacity: 1; transform: none; }

/* ---------- 7. 响应式 ---------- */
@media (min-width: 720px) {
  .jn-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .jn-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .jn-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 1080px) {
  .jn-nav__link { font-size: 14px; letter-spacing: .04em; gap: 6px; }
  .jn-brand__name { letter-spacing: .1em; }
}

@media (max-width: 900px) {
  .jn-masthead {
    grid-template-columns: 1fr auto;
    padding-block: 12px;
    gap: 10px;
  }
  .jn-masthead__rail--left { display: none; }
  .jn-masthead__rail--right { gap: 10px; }
  .jn-brand { justify-self: start; gap: 10px; }
  .jn-brand__mark { width: 32px; height: 32px; }
  .jn-brand__name { font-size: 1.2rem; letter-spacing: .1em; }
  .jn-brand__sub { font-size: 9px; letter-spacing: .22em; margin-top: 6px; }

  .jn-btn--action { padding: .5rem .9rem; font-size: 13px; letter-spacing: .06em; }
  .jn-nav-toggle { display: inline-flex; }

  .jn-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    z-index: 70;
    max-height: min(72vh, 540px);
    overflow-y: auto;
    border-top: 1px solid var(--jn-line);
    border-bottom: 2px solid var(--jn-orange);
    background: linear-gradient(180deg, #0C2233, #0A1A29);
    box-shadow: 0 34px 64px -34px rgba(0, 0, 0, .95);
  }
  .jn-header[data-open="true"] .jn-nav {
    display: block;
    animation: jn-drawer .22s ease both;
  }

  .jn-nav__list {
    grid-template-columns: 1fr;
    padding: 8px var(--jn-gutter) 18px;
  }
  .jn-nav__item { display: block; }
  .jn-nav__link {
    justify-content: space-between;
    padding: 14px 4px;
    border-bottom: 1px dashed rgba(31, 74, 99, .95);
    border-bottom-width: 1px;
  }
  .jn-nav__link[aria-current="page"] {
    border-bottom-color: var(--jn-orange);
    background: linear-gradient(90deg, rgba(255, 92, 56, .22), transparent);
  }
  .jn-nav__index { order: 2; }

  .jn-quick { padding-top: 6px; }
  .jn-quick__list {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 4px;
    scrollbar-width: thin;
  }
  .jn-quick__link { white-space: nowrap; }

  .jn-foot__grid { grid-template-columns: 1fr 1fr; }
  .jn-foot__brand { grid-column: 1 / -1; }
}

@keyframes jn-drawer {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: none; }
}

@media (max-width: 560px) {
  .jn-status__item { font-size: 11px; letter-spacing: .06em; }
  .jn-brand__name { font-size: 1.05rem; letter-spacing: .06em; }
  .jn-brand__sub { letter-spacing: .16em; }
  .jn-foot__grid { grid-template-columns: 1fr; }
  .jn-foot__tagline { max-width: 26ch; }
  .jn-display { max-width: 100%; }
  .jn-totop { padding: 9px 13px; font-size: 12px; }
}

/* ---------- 8. 可访问性：减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .jn-status { overflow-x: auto; }
  .jn-status__track { animation: none; transform: none; }

  .jn-reveal { opacity: 1; transform: none; }

  .jn-totop { transition: none; }
}