/* ============================================================
   加拿大预测28 · 共享样式 /assets/site.css
   北境极光 × 数字脉冲：深色封面分区 + 冰白阅读分区
   ============================================================ */

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

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

body {
  margin: 0;
  background: var(--cn-ice);
  color: var(--cn-ink);
  font-family: var(--cn-font-body);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--cn-font-display);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

p { margin: 0; }

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

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

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

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

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

:focus-visible {
  outline: 2px solid var(--cn-cyan);
  outline-offset: 3px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --cn-red: #D7263D;
  --cn-red-deep: #A81C30;
  --cn-blue: #1B6EC2;
  --cn-cyan: #23C9B6;
  --cn-gold: #F2A93B;
  --cn-ink: #10151F;
  --cn-night: #0B2338;
  --cn-ice: #F5F9FD;
  --cn-mist: #5C6B7E;
  --cn-frost: #A9C8E8;
  --cn-line: rgba(169, 200, 232, 0.55);
  --cn-line-dark: rgba(169, 200, 232, 0.24);
  --cn-ice-70: rgba(245, 249, 253, 0.7);
  --cn-header-h: 76px;
  --cn-font-display: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC",
    "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --cn-font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    system-ui, -apple-system, "Segoe UI", sans-serif;
  --cn-font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;
  --cn-shadow: 0 18px 46px -28px rgba(11, 35, 56, 0.6);
}

/* ---------- 3. 中文排版与通用文字 ---------- */
.cn-mono {
  font-family: var(--cn-font-mono);
  font-size: 0.9em;
  letter-spacing: 0.06em;
}

.cn-prose {
  max-width: 34em;
  color: var(--cn-ink);
}

.cn-prose p { margin: 0 0 1.05em; }
.cn-prose p:last-child { margin-bottom: 0; }
.cn-prose h2,
.cn-prose h3 {
  color: var(--cn-blue);
  margin: 1.6em 0 0.6em;
}
.cn-prose h2 { font-size: clamp(1.5rem, 2.6vw, 2.4rem); }
.cn-prose ul { margin: 0 0 1.05em; padding-left: 1.1em; list-style: none; }
.cn-prose li { position: relative; margin-bottom: 0.5em; }
.cn-prose li::before {
  content: "";
  position: absolute;
  left: -1.1em;
  top: 0.72em;
  width: 7px;
  height: 7px;
  background: var(--cn-gold);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.cn-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--cn-font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--cn-red);
}
.cn-eyebrow::after {
  content: "";
  width: 42px;
  height: 2px;
  background: linear-gradient(90deg, var(--cn-red), var(--cn-gold));
}

.cn-rail {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--cn-font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--cn-mist);
}

.cn-number {
  font-family: var(--cn-font-mono);
  font-weight: 700;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cn-gold);
}

/* ---------- 4. 布局容器与网格 ---------- */
.cn-container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding-left: clamp(18px, 4vw, 40px);
  padding-right: clamp(18px, 4vw, 40px);
}

.cn-main { display: block; }
.cn-main--offset { padding-top: var(--cn-header-h); }

.cn-section {
  position: relative;
  padding-top: clamp(48px, 7vw, 96px);
  padding-bottom: clamp(48px, 7vw, 96px);
}
.cn-section--ice { background: var(--cn-ice); }
.cn-section--ink { background: var(--cn-ink); color: var(--cn-ice); }
.cn-section--ink .cn-prose { color: var(--cn-ice); }
.cn-section--ink .cn-prose h2,
.cn-section--ink .cn-prose h3 { color: var(--cn-frost); }

.cn-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.cn-section__title {
  font-size: clamp(1.5rem, 2.6vw, 2.4rem);
  font-weight: 700;
  color: var(--cn-blue);
  max-width: 26em;
}
.cn-section--ink .cn-section__title { color: var(--cn-ice); }

.cn-section__lead {
  margin-top: 12px;
  max-width: 34em;
  color: var(--cn-mist);
  font-size: 16px;
}
.cn-section--ink .cn-section__lead { color: var(--cn-ice-70); }

.cn-grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}
.cn-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.cn-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.cn-grid--asym { grid-template-columns: minmax(0, 7fr) minmax(0, 3fr); }

/* ---------- 5. 封面首屏 ---------- */
.cn-hero {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: linear-gradient(165deg, #0B2338 0%, #0E3A5C 48%, #10151F 100%);
  color: var(--cn-ice);
  padding-top: calc(var(--cn-header-h) + clamp(38px, 7vw, 86px));
  padding-bottom: clamp(42px, 7vw, 92px);
}
.cn-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(rgba(169, 200, 232, 0.22) 1px, transparent 1px),
    radial-gradient(60% 45% at 88% 6%, rgba(35, 201, 182, 0.28), transparent 70%),
    radial-gradient(50% 40% at 6% 96%, rgba(215, 38, 61, 0.22), transparent 72%);
  background-size: 24px 24px, auto, auto;
  opacity: 0.75;
  pointer-events: none;
}
.cn-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  align-items: end;
}
.cn-hero__title {
  font-family: var(--cn-font-display);
  font-weight: 900;
  font-size: clamp(2.6rem, 6vw, 5.4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--cn-ice);
}
.cn-hero__lead {
  margin-top: 18px;
  max-width: 38rem;
  font-size: 17px;
  color: rgba(245, 249, 253, 0.86);
}
.cn-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 24px;
  font-family: var(--cn-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--cn-frost);
}

/* ---------- 6. 按钮 ---------- */
.cn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid transparent;
  background: transparent;
  font-family: var(--cn-font-display);
  font-weight: 700;
  font-size: 15px;
  line-height: 1;
  letter-spacing: 0.04em;
  cursor: pointer;
  clip-path: polygon(12px 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%, 0 12px);
  transition: background-color 0.24s ease, color 0.24s ease, transform 0.24s ease, border-color 0.24s ease;
}
.cn-btn--primary { background: var(--cn-red); color: #fff; }
.cn-btn--primary:hover { background: var(--cn-red-deep); transform: translateY(-2px); }
.cn-btn--ghost {
  background: transparent;
  color: var(--cn-ice);
  border-color: var(--cn-frost);
}
.cn-btn--ghost:hover { background: rgba(245, 249, 253, 0.12); transform: translateY(-2px); }
.cn-btn--gold { background: var(--cn-gold); color: var(--cn-ink); }
.cn-btn--gold:hover { background: #d9902a; transform: translateY(-2px); }

/* ---------- 7. 站点头部 ---------- */
.cn-skip {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 120;
  padding: 12px 20px;
  background: var(--cn-gold);
  color: var(--cn-ink);
  font-weight: 700;
  font-size: 14px;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: top 0.2s ease;
}
.cn-skip:focus { top: 12px; }

.cn-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  background: linear-gradient(180deg, rgba(11, 35, 56, 0.78) 0%, rgba(11, 35, 56, 0) 100%);
  transition: background-color 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
}
.cn-header[data-scrolled] {
  background: linear-gradient(180deg, #0B2338 0%, #10151F 100%);
  border-bottom-color: var(--cn-line-dark);
  box-shadow: 0 14px 34px -24px rgba(0, 0, 0, 0.85);
}

.cn-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  height: var(--cn-header-h);
}

.cn-header__trace {
  display: block;
  height: 2px;
  width: 100%;
  transform: scaleX(var(--cn-scroll, 0));
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cn-red), var(--cn-blue) 42%, var(--cn-cyan) 78%, var(--cn-gold));
  transition: transform 0.12s linear;
}

.cn-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: var(--cn-ice);
}
.cn-brand__mark {
  position: relative;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  background: linear-gradient(140deg, var(--cn-red) 0%, var(--cn-red-deep) 42%, var(--cn-blue) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
}
.cn-brand__pulse {
  width: 11px;
  height: 11px;
  background: var(--cn-ice);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  animation: cn-pulse 7s ease-in-out infinite;
}
@keyframes cn-pulse {
  0%, 100% { opacity: 0.55; transform: scale(0.82); }
  50% { opacity: 1; transform: scale(1.12); }
}
.cn-brand__text { display: flex; flex-direction: column; line-height: 1.2; }
.cn-brand__name {
  font-family: var(--cn-font-display);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: 0.02em;
}
.cn-brand__tagline {
  margin-top: 3px;
  font-family: var(--cn-font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cn-frost);
}

.cn-nav { margin-left: clamp(8px, 1.6vw, 26px); }
.cn-nav__list { display: flex; align-items: center; gap: 2px; }
.cn-nav__item { list-style: none; }
.cn-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 12px;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: rgba(245, 249, 253, 0.8);
  transition: color 0.24s ease;
}
.cn-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 2px;
  background: linear-gradient(90deg, var(--cn-red), var(--cn-gold));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.28s ease;
}
.cn-nav__link:hover { color: var(--cn-ice); }
.cn-nav__link:hover::after,
.cn-nav__link[aria-current="page"]::after { transform: scaleX(1); }
.cn-nav__link[aria-current="page"] { color: var(--cn-ice); }
.cn-nav__index {
  font-family: var(--cn-font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cn-gold);
}
.cn-nav__link[aria-current="page"] .cn-nav__index { color: var(--cn-cyan); }

.cn-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex: 0 0 auto;
}

.cn-searchlink {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border: 1px solid rgba(169, 200, 232, 0.42);
  color: var(--cn-ice);
  font-size: 14px;
  letter-spacing: 0.06em;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: border-color 0.24s ease, background-color 0.24s ease;
}
.cn-searchlink:hover {
  border-color: var(--cn-cyan);
  background: rgba(35, 201, 182, 0.12);
}
.cn-searchlink__icon {
  position: relative;
  flex: 0 0 auto;
  width: 13px;
  height: 13px;
  border: 1.5px solid currentColor;
  border-radius: 50%;
}
.cn-searchlink__icon::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -3px;
  width: 7px;
  height: 1.5px;
  background: currentColor;
  transform: rotate(45deg);
}
.cn-searchlink__text { white-space: nowrap; }

.cn-cta { white-space: nowrap; }

.cn-navtoggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid rgba(169, 200, 232, 0.45);
  color: var(--cn-ice);
  cursor: pointer;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}
.cn-navtoggle__label {
  font-family: var(--cn-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
}
.cn-navtoggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}
.cn-navtoggle__bar {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.24s ease, opacity 0.24s ease;
}
.cn-navtoggle[aria-expanded="true"] .cn-navtoggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.cn-navtoggle[aria-expanded="true"] .cn-navtoggle__bar:nth-child(2) { opacity: 0; }
.cn-navtoggle[aria-expanded="true"] .cn-navtoggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 8. 站点页脚 ---------- */
.cn-footer {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: linear-gradient(180deg, #0B2338 0%, #10151F 58%, #0B2338 100%);
  color: var(--cn-ice);
  padding-top: clamp(44px, 6vw, 82px);
}
.cn-footer__aurora {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 38% at 10% 0%, rgba(35, 201, 182, 0.22), transparent 70%),
    radial-gradient(46% 32% at 84% 6%, rgba(27, 110, 194, 0.36), transparent 72%),
    radial-gradient(30% 22% at 66% 100%, rgba(242, 169, 59, 0.16), transparent 76%);
}
.cn-footer__inner {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
  align-items: start;
}
.cn-footer__logo {
  display: inline-block;
  font-family: var(--cn-font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  letter-spacing: 0.02em;
  color: var(--cn-ice);
}
.cn-footer__logo::after {
  content: "";
  display: block;
  width: 54px;
  height: 4px;
  margin-top: 10px;
  background: linear-gradient(90deg, var(--cn-red), var(--cn-gold));
}
.cn-footer__tagline {
  margin-top: 14px;
  font-size: 14px;
  color: var(--cn-ice-70);
}
.cn-footer__short {
  margin-top: 8px;
  font-family: var(--cn-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cn-frost);
}

.cn-footer__grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.4fr);
}
.cn-footer__col { min-width: 0; }
.cn-footer__title {
  font-family: var(--cn-font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--cn-cyan);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--cn-line-dark);
  margin-bottom: 14px;
}
.cn-footer__item { margin-bottom: 10px; }
.cn-footer__link {
  display: inline-block;
  font-size: 15px;
  color: rgba(245, 249, 253, 0.78);
  transition: color 0.2s ease, transform 0.2s ease;
}
.cn-footer__link:hover {
  color: var(--cn-gold);
  transform: translateX(3px);
}
.cn-footer__link .cn-mono { color: var(--cn-frost); }

.cn-footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  margin-top: clamp(30px, 4vw, 52px);
  padding-top: 18px;
  padding-bottom: 26px;
  border-top: 1px solid var(--cn-line-dark);
  font-size: 13px;
  color: rgba(245, 249, 253, 0.66);
}
.cn-footer__legal,
.cn-footer__copy,
.cn-footer__note { margin: 0; }
.cn-footer__copy { font-family: var(--cn-font-mono); letter-spacing: 0.04em; }
.cn-footer__note { max-width: 34em; }

/* ---------- 9. 研究板 / 色带 / 标签 / 面包屑 ---------- */
.cn-panel {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  background: #fff;
  border: 1px solid var(--cn-frost);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));
  box-shadow: var(--cn-shadow);
}
.cn-panel--dark {
  background: #131A26;
  border-color: var(--cn-line-dark);
  color: var(--cn-ice);
}
.cn-panel__title {
  font-size: clamp(1.15rem, 1.8vw, 1.5rem);
  color: var(--cn-blue);
  margin-bottom: 12px;
}
.cn-panel--dark .cn-panel__title { color: var(--cn-frost); }
.cn-panel__body { font-size: 16px; }
.cn-panel__meta {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid rgba(169, 200, 232, 0.4);
  font-family: var(--cn-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cn-mist);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}
.cn-panel--dark .cn-panel__meta { color: var(--cn-frost); border-top-color: var(--cn-line-dark); }

.cn-band {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  padding: 14px 0;
  border-top: 1px solid var(--cn-line);
  border-bottom: 1px solid var(--cn-line);
  margin: clamp(28px, 4.5vw, 60px) 0;
}
.cn-band__label {
  flex: 0 0 auto;
  font-family: var(--cn-font-mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--cn-red);
}
.cn-band__rule {
  flex: 1 1 auto;
  height: 2px;
  min-width: 40px;
  background: linear-gradient(90deg, var(--cn-red), var(--cn-blue) 45%, var(--cn-cyan) 78%, var(--cn-gold));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.5s ease;
}
.cn-band.cn-reveal--in .cn-band__rule { transform: scaleX(1); }

.cn-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-family: var(--cn-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cn-blue);
  background: rgba(27, 110, 194, 0.08);
  border: 1px solid rgba(27, 110, 194, 0.26);
}
.cn-tag--gold {
  color: #8a5a10;
  background: rgba(242, 169, 59, 0.16);
  border-color: rgba(242, 169, 59, 0.42);
}

.cn-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: #fff;
  border: 1px solid var(--cn-frost);
  color: var(--cn-ink);
  font-size: 14px;
  cursor: pointer;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.cn-chip:hover { border-color: var(--cn-blue); }
.cn-chip[aria-pressed="true"] {
  background: var(--cn-blue);
  border-color: var(--cn-blue);
  color: #fff;
}

.cn-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--cn-font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cn-mist);
}
.cn-breadcrumb a { color: var(--cn-blue); }
.cn-breadcrumb a:hover { text-decoration: underline; }
.cn-breadcrumb__sep { color: var(--cn-frost); }
.cn-breadcrumb [aria-current="page"] { color: var(--cn-ink); }

/* ---------- 10. 可展开内容组 ---------- */
.cn-fold {
  border-bottom: 1px solid var(--cn-line);
  background: transparent;
}
.cn-fold__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 18px 0;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  font-family: var(--cn-font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--cn-blue);
}
.cn-fold__icon {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  transition: transform 0.24s ease;
}
.cn-fold__icon::before,
.cn-fold__icon::after {
  content: "";
  position: absolute;
  background: var(--cn-red);
}
.cn-fold__icon::before { left: 0; top: 6px; width: 14px; height: 2px; }
.cn-fold__icon::after { left: 6px; top: 0; width: 2px; height: 14px; }
.cn-fold[data-open] .cn-fold__icon { transform: rotate(180deg); }
.cn-fold[data-open] .cn-fold__icon::after { opacity: 0; }
.cn-fold__panel {
  height: 0;
  overflow: hidden;
  transition: height 0.24s ease;
}
.cn-fold__inner { padding: 0 0 20px; }
.cn-fold__inner p { max-width: 34em; }

/* ---------- 11. 图片容器 ---------- */
.cn-media {
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(140deg, #0B2338 0%, #12405F 52%, #1B6EC2 100%);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}
.cn-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: relative;
  z-index: 1;
}
.cn-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(169, 200, 232, 0.22) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.5;
  pointer-events: none;
}
.cn-media--wide { aspect-ratio: 21 / 9; }
.cn-media--hero { aspect-ratio: 16 / 9; }
.cn-media--square { aspect-ratio: 1 / 1; }
.cn-media--tall { aspect-ratio: 3 / 4; }
.cn-media__caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--cn-mist);
}

/* ---------- 12. 显现与提示 ---------- */
.cn-reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}
.cn-reveal--in {
  opacity: 1;
  transform: none;
}

.cn-toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 140;
  transform: translate(-50%, 14px);
  padding: 10px 20px;
  background: #10151F;
  color: var(--cn-ice);
  border: 1px solid var(--cn-cyan);
  font-family: var(--cn-font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.24s ease, transform 0.24s ease, visibility 0.24s linear;
}
.cn-toast[data-open] {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1200px) {
  .cn-brand__tagline { display: none; }
  .cn-cta { display: none; }
}

@media (max-width: 1024px) {
  :root { --cn-header-h: 64px; }
  .cn-navtoggle { display: inline-flex; }
  .cn-searchlink__text { display: none; }

  .cn-nav {
    position: fixed;
    top: var(--cn-header-h);
    left: 0;
    right: 0;
    margin-left: 0;
    max-height: calc(100vh - var(--cn-header-h));
    overflow-y: auto;
    padding: 6px clamp(18px, 5vw, 40px) 26px;
    background: linear-gradient(180deg, #0B2338 0%, #10151F 100%);
    border-top: 1px solid var(--cn-line-dark);
    border-bottom: 1px solid var(--cn-line-dark);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.24s ease, transform 0.24s ease, visibility 0.24s linear;
  }
  .cn-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }
  .cn-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .cn-nav__item { border-bottom: 1px solid var(--cn-line-dark); }
  .cn-nav__link { display: flex; padding: 16px 0; font-size: 17px; }
  .cn-nav__link::after { left: 0; right: auto; width: 38px; bottom: 10px; }
  .cn-nav__index { align-self: center; }

  .cn-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .cn-footer__grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .cn-footer__col:last-child { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .cn-grid--2,
  .cn-grid--3,
  .cn-grid--asym { grid-template-columns: minmax(0, 1fr); }
  .cn-hero__inner { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .cn-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .cn-footer__meta { flex-direction: column; align-items: flex-start; }
  .cn-rail { writing-mode: horizontal-tb; }
  .cn-navtoggle__label { display: none; }
  .cn-brand__name { font-size: 16px; }
}

/* ---------- 14. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cn-brand__pulse { animation: none; opacity: 0.9; transform: none; }
  .cn-header__trace { transition: none; }
  .cn-reveal { transform: none; transition: opacity 0.3s ease; }
  .cn-band__rule { transition: none; transform: scaleX(1); }
  .cn-nav,
  .cn-fold__panel,
  .cn-fold__icon,
  .cn-toast,
  .cn-btn,
  .cn-chip,
  .cn-navtoggle__bar,
  .cn-nav__link::after,
  .cn-footer__link { transition: none; }
  .cn-btn:hover,
  .cn-footer__link:hover { transform: none; }
}