/* =========================================================
   江南赛场 JN — /assets/site.css
   共享外壳：reset / tokens / 头部 / 页脚 / 通用组件
   ========================================================= */

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

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

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

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

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

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

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

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

/* ---------- 2. Tokens ---------- */
:root {
  /* 色彩 */
  --jn-jiangnan: #7C8A96;
  --jn-ink: #0E1A2B;
  --jn-table: #14263D;
  --jn-lime: #B6FF3B;
  --jn-orange: #FF7A1A;
  --jn-wine: #6E1F2E;
  --jn-indigo: #3A2D6B;
  --jn-warm: #D8D3CC;
  --jn-paper: #F4F1EA;
  --jn-white: #FFFFFF;
  --jn-line: #0B0F14;

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

  /* 尺寸 */
  --jn-shell: 1240px;
  --jn-shell-wide: 1440px;
  --jn-read: 720px;
  --jn-gutter: clamp(16px, 4vw, 40px);
  --jn-radius: 18px;
  --jn-radius-sm: 12px;
  --jn-radius-pill: 999px;

  /* 材质 */
  --jn-frame: 2px solid var(--jn-line);
  --jn-shadow: 6px 6px 0 var(--jn-line);
  --jn-shadow-lg: 10px 10px 0 var(--jn-line);

  /* 节奏 */
  --jn-header-space: clamp(96px, 12vw, 132px);
  --jn-ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 3. Base ---------- */
body {
  min-height: 100%;
  font-family: var(--jn-font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--jn-ink);
  background-color: var(--jn-jiangnan);
  background-image:
    radial-gradient(120% 80% at 10% -10%, rgba(244, 241, 234, .34), transparent 58%),
    radial-gradient(90% 70% at 104% 8%, rgba(14, 26, 43, .38), transparent 62%),
    repeating-linear-gradient(115deg, rgba(255, 255, 255, .05) 0 2px, transparent 2px 10px);
  background-attachment: fixed;
  overflow-x: hidden;
}

main {
  display: block;
  padding-top: var(--jn-header-space);
}

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

:focus-visible {
  outline: 3px solid var(--jn-orange);
  outline-offset: 3px;
  border-radius: 6px;
}

#main-content:focus { outline: none; }

/* ---------- 4. A11y 工具 ---------- */
.jn-visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.jn-skip {
  position: fixed;
  top: 10px;
  left: 50%;
  z-index: 200;
  padding: 12px 22px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--jn-ink);
  background: var(--jn-lime);
  border: var(--jn-frame);
  border-radius: var(--jn-radius-pill);
  box-shadow: var(--jn-shadow);
  transform: translate(-50%, -220%);
  transition: transform .2s var(--jn-ease);
}

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

/* ---------- 5. 布局容器 ---------- */
.jn-shell {
  width: 100%;
  max-width: var(--jn-shell);
  margin-inline: auto;
  padding-inline: var(--jn-gutter);
}

.jn-shell--wide { max-width: var(--jn-shell-wide); }
.jn-shell--read { max-width: var(--jn-read); }

.jn-section { padding-block: clamp(40px, 6vw, 88px); }
.jn-section--tight { padding-block: clamp(24px, 3.5vw, 48px); }

.jn-section--paper { background: var(--jn-paper); color: var(--jn-ink); }
.jn-section--ink { background: var(--jn-ink); color: var(--jn-paper); }
.jn-section--table { background: var(--jn-table); color: var(--jn-paper); }
.jn-section--wine { background: var(--jn-wine); color: var(--jn-paper); }
.jn-section--indigo { background: var(--jn-indigo); color: var(--jn-paper); }

.jn-grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.jn-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.jn-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.jn-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.jn-grid--sidebar { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); }

.jn-stack {
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2vw, 24px);
}

.jn-cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 14px;
}

.jn-divider {
  height: 2px;
  border: 0;
  margin: 0;
  background: currentColor;
  opacity: .18;
}

/* ---------- 6. 排版 ---------- */
.jn-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--jn-font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: rgba(11, 15, 20, .62);
}

.jn-eyebrow::before {
  content: "";
  width: 28px;
  height: 3px;
  background: var(--jn-orange);
}

.jn-section--ink .jn-eyebrow,
.jn-section--table .jn-eyebrow,
.jn-section--wine .jn-eyebrow,
.jn-section--indigo .jn-eyebrow { color: var(--jn-lime); }

.jn-h1 {
  font-size: clamp(40px, 8vw, 88px);
  line-height: 1.02;
  letter-spacing: .04em;
  font-weight: 800;
  margin: 0;
}

.jn-h2 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.16;
  letter-spacing: .05em;
  font-weight: 800;
  margin: 0 0 .5em;
}

.jn-h3 {
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.4;
  letter-spacing: .03em;
  font-weight: 700;
  margin: 0 0 .4em;
}

.jn-lede {
  max-width: 48ch;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.8;
  color: rgba(11, 15, 20, .78);
  margin: 0;
}

.jn-section--ink .jn-lede,
.jn-section--table .jn-lede,
.jn-section--wine .jn-lede,
.jn-section--indigo .jn-lede { color: rgba(244, 241, 234, .82); }

.jn-prose {
  max-width: var(--jn-read);
  font-size: 17px;
  line-height: 1.85;
}

.jn-prose p { margin: 0 0 1.15em; }
.jn-prose p:last-child { margin-bottom: 0; }

.jn-prose a {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  text-decoration-color: var(--jn-orange);
}

.jn-prose a:hover { color: var(--jn-ink); background: var(--jn-lime); }

.jn-mono {
  font-family: var(--jn-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

/* ---------- 7. 按钮 ---------- */
.jn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: .05em;
  line-height: 1.2;
  border: var(--jn-frame);
  border-radius: var(--jn-radius-pill);
  background: transparent;
  color: var(--jn-ink);
  cursor: pointer;
  box-shadow: 0 0 0 var(--jn-line);
  transition: transform .16s var(--jn-ease), box-shadow .16s var(--jn-ease), background-color .16s ease, color .16s ease;
}

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

.jn-btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--jn-line);
}

.jn-btn:active {
  transform: translate(0, 0);
  box-shadow: 0 0 0 var(--jn-line);
}

.jn-btn--sm { padding: 9px 16px; font-size: 13.5px; }
.jn-btn--block { width: 100%; }

/* ---------- 8. 头部：悬浮胶囊浮岛 ---------- */
.jn-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  padding: clamp(10px, 1.6vw, 18px) var(--jn-gutter) 0;
  pointer-events: none;
}

.jn-header__island {
  pointer-events: auto;
  max-width: var(--jn-shell);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 26px);
  padding: 10px 14px 10px 18px;
  background: var(--jn-jiangnan);
  border: var(--jn-frame);
  border-radius: var(--jn-radius-pill);
  box-shadow: var(--jn-shadow);
  transition: padding .26s var(--jn-ease), box-shadow .26s var(--jn-ease), background-color .26s ease;
}

.jn-header.is-scrolled .jn-header__island { background: #86939E; }

.jn-header.is-condensed .jn-header__island {
  padding: 6px 12px 6px 14px;
  box-shadow: 4px 4px 0 var(--jn-line);
}

/* 品牌 */
.jn-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--jn-ink);
}

.jn-brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--jn-ink);
  color: var(--jn-lime);
  border: var(--jn-frame);
  border-radius: var(--jn-radius-sm);
  font-family: var(--jn-font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  transition: width .26s var(--jn-ease), height .26s var(--jn-ease);
}

.jn-header.is-condensed .jn-brand__mark { width: 32px; height: 32px; font-size: 12.5px; }

.jn-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.06;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .1em;
}

.jn-brand__text em {
  font-family: var(--jn-font-mono);
  font-style: normal;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .3em;
  color: rgba(11, 15, 20, .55);
}

/* 导航 */
.jn-nav {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.4vw, 18px);
  margin-left: auto;
}

.jn-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(2px, .5vw, 6px);
}

.jn-nav__link {
  display: inline-block;
  padding: 9px 14px;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: .04em;
  white-space: nowrap;
  color: rgba(11, 15, 20, .78);
  border: 2px solid transparent;
  border-radius: var(--jn-radius-pill);
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}

.jn-nav__link:hover {
  background: rgba(244, 241, 234, .55);
  color: var(--jn-ink);
}

.jn-nav__link[aria-current="page"] {
  background: var(--jn-lime);
  border-color: var(--jn-line);
  color: var(--jn-ink);
}

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

/* 汉堡按钮 */
.jn-nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 16px;
  background: var(--jn-ink);
  color: var(--jn-lime);
  border: var(--jn-frame);
  border-radius: var(--jn-radius-pill);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  cursor: pointer;
}

.jn-nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background-color .18s ease;
}

.jn-nav-toggle__bars::before,
.jn-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform .2s var(--jn-ease);
}

.jn-nav-toggle__bars::before { top: -6px; }
.jn-nav-toggle__bars::after { top: 6px; }

.jn-nav-toggle[aria-expanded="true"] .jn-nav-toggle__bars { background: transparent; }
.jn-nav-toggle[aria-expanded="true"] .jn-nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.jn-nav-toggle[aria-expanded="true"] .jn-nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* 阅读进度 */
.jn-progress {
  max-width: var(--jn-shell);
  height: 3px;
  margin: 7px auto 0;
  border-radius: var(--jn-radius-pill);
  background: rgba(11, 15, 20, .22);
  overflow: hidden;
  opacity: 0;
  transition: opacity .3s ease;
}

.jn-header.is-scrolled .jn-progress { opacity: 1; }

.jn-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--jn-lime), var(--jn-orange));
}

/* ---------- 9. 页脚 ---------- */
.jn-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  background: var(--jn-ink);
  color: var(--jn-paper);
  border-top: 3px solid var(--jn-line);
  overflow: hidden;
}

.jn-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: linear-gradient(90deg,
    var(--jn-lime) 0 34%,
    var(--jn-orange) 34% 67%,
    var(--jn-wine) 67% 100%);
}

.jn-footer__grid {
  max-width: var(--jn-shell);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 80px) var(--jn-gutter) clamp(26px, 4vw, 44px);
  display: grid;
  gap: clamp(26px, 3vw, 44px);
  grid-template-columns: minmax(220px, 1.5fr) repeat(3, minmax(120px, 1fr)) minmax(200px, 1.4fr);
}

.jn-footer__brand .jn-brand--footer {
  color: var(--jn-paper);
  font-size: 20px;
}

.jn-footer__brand .jn-brand__mark {
  background: var(--jn-lime);
  color: var(--jn-ink);
}

.jn-footer__brand .jn-brand__text em { color: rgba(244, 241, 234, .5); }

.jn-footer__summary {
  margin-top: 18px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--jn-paper);
}

.jn-footer__note {
  margin-top: 8px;
  font-family: var(--jn-font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: rgba(244, 241, 234, .5);
}

.jn-footer__title {
  margin: 0 0 14px;
  font-family: var(--jn-font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--jn-lime);
}

.jn-footer__list {
  display: grid;
  gap: 10px;
}

.jn-footer__list a {
  display: inline-block;
  font-size: 15px;
  color: rgba(244, 241, 234, .78);
  border-bottom: 1px solid transparent;
  transition: color .16s ease, border-color .16s ease;
}

.jn-footer__list a:hover {
  color: var(--jn-lime);
  border-bottom-color: var(--jn-lime);
}

.jn-footer__contact-lines {
  display: grid;
  gap: 12px;
}

.jn-footer__contact-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--jn-font-mono);
  font-size: 13px;
  color: rgba(244, 241, 234, .86);
}

.jn-footer__address {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(244, 241, 234, .58);
}

.jn-copy {
  display: inline-flex;
  align-items: center;
  padding: 4px 11px;
  font-family: var(--jn-font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: rgba(244, 241, 234, .78);
  background: transparent;
  border: 1.5px solid rgba(244, 241, 234, .35);
  border-radius: var(--jn-radius-pill);
  cursor: pointer;
  transition: background-color .16s ease, color .16s ease, border-color .16s ease;
}

.jn-copy:hover {
  background: var(--jn-lime);
  border-color: var(--jn-lime);
  color: var(--jn-ink);
}

.jn-copy[data-copied="true"] {
  background: var(--jn-lime);
  border-color: var(--jn-lime);
  color: var(--jn-ink);
}

.jn-footer__strip {
  max-width: var(--jn-shell);
  margin-inline: auto;
  padding-inline: var(--jn-gutter);
  font-family: var(--jn-font-mono);
  font-size: clamp(42px, 13vw, 150px);
  font-weight: 800;
  letter-spacing: .08em;
  line-height: .84;
  white-space: nowrap;
  overflow: hidden;
  user-select: none;
  color: rgba(182, 255, 59, .1);
  -webkit-text-stroke: 1.5px rgba(182, 255, 59, .34);
}

.jn-footer__bottom {
  max-width: var(--jn-shell);
  margin-inline: auto;
  padding: 20px var(--jn-gutter) clamp(28px, 4vw, 42px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  border-top: 1px solid rgba(244, 241, 234, .16);
  margin-top: clamp(20px, 3vw, 34px);
}

.jn-footer__legal {
  margin: 0;
  font-family: var(--jn-font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(244, 241, 234, .58);
}

/* ---------- 10. 通用组件 ---------- */
.jn-card {
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--jn-paper);
  color: var(--jn-ink);
  border: var(--jn-frame);
  border-radius: var(--jn-radius);
  box-shadow: var(--jn-shadow);
  transition: transform .18s var(--jn-ease), box-shadow .18s var(--jn-ease);
}

.jn-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--jn-shadow-lg);
}

.jn-card--ink { background: var(--jn-ink); color: var(--jn-paper); }
.jn-card--warm { background: var(--jn-warm); color: var(--jn-ink); }
.jn-card--flat { box-shadow: none; }
.jn-card--flat:hover { transform: none; box-shadow: none; }

.jn-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  font-family: var(--jn-font-mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--jn-ink);
  background: var(--jn-lime);
  border: var(--jn-frame);
  border-radius: var(--jn-radius-pill);
}

.jn-tag--orange { background: var(--jn-orange); }
.jn-tag--ink { background: var(--jn-ink); color: var(--jn-lime); }
.jn-tag--warm { background: var(--jn-warm); }
.jn-tag--ghost {
  background: transparent;
  color: inherit;
  border-color: currentColor;
}

.jn-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--jn-font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.jn-badge::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--jn-orange);
  box-shadow: 0 0 0 3px rgba(255, 122, 26, .25);
}

.jn-badge--live::before {
  background: var(--jn-lime);
  box-shadow: 0 0 0 3px rgba(182, 255, 59, .28);
  animation: jn-pulse 1.8s ease-out infinite;
}

@keyframes jn-pulse {
  50% { box-shadow: 0 0 0 8px rgba(182, 255, 59, 0); }
}

.jn-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.jn-stat__value {
  font-family: var(--jn-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.4vw, 54px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--jn-ink);
}

.jn-stat__label {
  font-family: var(--jn-font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: rgba(11, 15, 20, .55);
}

.jn-stat--dark .jn-stat__value { color: var(--jn-white); }
.jn-stat--dark .jn-stat__label { color: rgba(244, 241, 234, .62); }
.jn-stat--lime .jn-stat__value { color: var(--jn-lime); }
.jn-stat--lime .jn-stat__label { color: rgba(244, 241, 234, .62); }

.jn-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  font-family: var(--jn-font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: rgba(11, 15, 20, .58);
}

.jn-crumbs a:hover {
  color: var(--jn-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.jn-crumbs__sep { opacity: .45; }

.jn-section--ink .jn-crumbs,
.jn-section--table .jn-crumbs,
.jn-section--wine .jn-crumbs,
.jn-section--indigo .jn-crumbs { color: rgba(244, 241, 234, .6); }

.jn-section--ink .jn-crumbs a:hover,
.jn-section--table .jn-crumbs a:hover,
.jn-section--wine .jn-crumbs a:hover,
.jn-section--indigo .jn-crumbs a:hover { color: var(--jn-lime); }

/* 图片容器（页面阶段放入 img / picture） */
.jn-media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--jn-table);
  border: var(--jn-frame);
  border-radius: var(--jn-radius);
  box-shadow: var(--jn-shadow);
}

.jn-media--wide { aspect-ratio: 21 / 9; }
.jn-media--tall { aspect-ratio: 3 / 4; }
.jn-media--square { aspect-ratio: 1 / 1; }

.jn-media img,
.jn-media picture,
.jn-media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.jn-media__placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--jn-font-mono);
  font-size: 12px;
  letter-spacing: .3em;
  color: rgba(244, 241, 234, .45);
  background-image:
    repeating-linear-gradient(135deg, rgba(244, 241, 234, .07) 0 10px, transparent 10px 20px),
    linear-gradient(160deg, var(--jn-table), var(--jn-indigo));
}

.jn-media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  font-family: var(--jn-font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--jn-paper);
  background: var(--jn-ink);
  border-top: 2px solid var(--jn-line);
  border-right: 2px solid var(--jn-line);
  border-top-right-radius: 10px;
}

/* 显现 */
html.jn-anim-on .jn-reveal {
  opacity: 0;
  transform: translateY(18px);
}

html.jn-anim-on .jn-reveal.is-visible {
  opacity: 1;
  transform: none;
  transition: opacity .5s var(--jn-ease), transform .5s var(--jn-ease);
}

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1180px) {
  .jn-footer__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .jn-footer__brand { grid-column: 1 / -1; }
  .jn-footer__contact { grid-column: 1 / -1; }
}

@media (max-width: 980px) {
  .jn-header__island {
    flex-wrap: wrap;
    border-radius: 26px;
    padding: 10px 12px;
  }

  .jn-brand__text { font-size: 16px; }

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

  .jn-nav {
    order: 3;
    flex-basis: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    margin: 12px 0 2px;
    padding: 14px;
    background: var(--jn-ink);
    border: var(--jn-frame);
    border-radius: var(--jn-radius);
    box-shadow: var(--jn-shadow);
  }

  .jn-nav[data-open] {
    display: flex;
    animation: jn-drop .22s var(--jn-ease);
  }

  .jn-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .jn-nav__link {
    display: block;
    padding: 12px 14px;
    font-size: 15px;
    color: var(--jn-paper);
    border-radius: var(--jn-radius-sm);
  }

  .jn-nav__link:hover {
    background: rgba(182, 255, 59, .14);
    color: var(--jn-white);
  }

  .jn-nav__link[aria-current="page"] {
    background: var(--jn-lime);
    border-color: transparent;
    color: var(--jn-ink);
  }

  .jn-nav__actions {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .jn-nav__actions .jn-btn { width: 100%; padding: 12px 16px; }

  .jn-progress { margin-top: 9px; }

  .jn-grid--3,
  .jn-grid--4,
  .jn-grid--sidebar { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  body { background-attachment: scroll; }
}

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

@media (max-width: 700px) {
  body { font-size: 16px; }

  .jn-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .jn-footer__brand,
  .jn-footer__contact { grid-column: 1 / -1; }

  .jn-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
  }

  .jn-grid--2,
  .jn-grid--3,
  .jn-grid--4,
  .jn-grid--sidebar { grid-template-columns: minmax(0, 1fr); }

  .jn-media--wide { aspect-ratio: 16 / 9; }
}

@media (max-width: 440px) {
  .jn-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .jn-brand__text em { display: none; }
  .jn-media { box-shadow: 4px 4px 0 var(--jn-line); }
}

/* ---------- 12. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

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