/* ===========================================================
   乐竞体育主站 · /assets/site.css
   共享层：reset / 令牌 / 中文排版 / 站头 / 站脚 / 通用组件
   =========================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root{
  color-scheme: dark;

  --ink-void: #050B18;
  --deck-blue: #0D1A2E;
  --grid-line: #243349;
  --paper: #F2E9DA;
  --paper-dim: #BDB3A0;
  --cyan: #2BE7DA;
  --orange: #FF6A2E;
  --lime: #B6FF3D;
  --red: #FF4D5E;
  --on-paper: #101A2B;

  --font-display: "Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body: var(--font-display);
  --font-mono: "JetBrains Mono","IBM Plex Mono",ui-monospace,"SFMono-Regular",Consolas,"Liberation Mono","Courier New",monospace;

  --gutter: clamp(18px, 5vw, 72px);
  --shell-max: 1360px;
  --grid-gap: clamp(16px, 2vw, 24px);
  --ease: cubic-bezier(.2,.8,.2,1);
  --t-fast: 160ms;
  --rule: 1px solid var(--grid-line);
}

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

html{
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-block-start: 76px;
}

body{
  margin: 0;
  background-color: var(--ink-void);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, p, ul, ol, li, figure, figcaption, blockquote{ margin: 0; }
ul, ol{ padding: 0; list-style: none; }
img, svg, video{ display: block; max-width: 100%; }
a{ color: inherit; text-decoration: none; }
button{ font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
main{ display: block; }

::selection{ background: var(--cyan); color: var(--ink-void); }

/* ---------- 3. 中文排版 ---------- */
h1, h2, h3, h4{
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.15;
  text-wrap: balance;
}

h1{ font-size: clamp(1.9rem, 4vw, 3rem); }
h2{ font-size: clamp(1.4rem, 2.6vw, 2.1rem); }
h3{ font-size: clamp(1.1rem, 1.8vw, 1.35rem); letter-spacing: -0.01em; }
h4{ font-size: 1rem; letter-spacing: 0; }

p{ line-height: 1.85; }
small{ font-size: 13px; }

.display-xl{
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.4rem, 6vw, 5rem);
  letter-spacing: -0.02em;
  line-height: 1.02;
  text-wrap: balance;
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible,
input:focus-visible,
summary:focus-visible{
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 4. 容器与布局基元 ---------- */
.shell{
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.grid{
  display: grid;
  gap: var(--grid-gap);
}
.grid--split{ grid-template-columns: minmax(0,7fr) minmax(0,4fr) minmax(0,1fr); }
.grid--halves{ grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid--thirds{ grid-template-columns: repeat(3, minmax(0,1fr)); }

.section{ padding-block: clamp(48px, 7vw, 96px); }

.section__head{
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 12px 24px;
  margin-block-end: clamp(24px, 3vw, 40px);
  padding-block-end: 16px;
  border-bottom: var(--rule);
}

.section__title{
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.section__lead{
  max-width: 58ch;
  margin-inline-start: auto;
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-dim);
}

/* ---------- 5. 跳转链接 ---------- */
.skip-link{
  position: fixed;
  inset-block-start: 12px;
  inset-inline-start: 12px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--paper);
  color: var(--on-paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  border: 1px solid var(--on-paper);
  transform: translateY(-180%);
  transition: transform var(--t-fast) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{
  transform: translateY(0);
}

/* ---------- 6. 站头 ---------- */
.site-header{
  position: relative;
  z-index: 40;
  background-color: var(--ink-void);
  color: var(--paper);
}

.header-upper{
  background-color: var(--ink-void);
  border-bottom: 1px solid var(--grid-line);
}

.header-upper__inner{
  display: flex;
  align-items: center;
  gap: clamp(14px, 3vw, 40px);
  min-height: 78px;
  padding-block: 12px;
}

.brand-block{
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-inline-end: auto;
  min-width: 0;
}

.brand{
  display: inline-flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--paper);
  transition: color var(--t-fast) var(--ease);
}
.brand:hover{ color: var(--cyan); }

.brand__mark{
  display: inline-block;
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan);
  background: rgba(43, 231, 218, 0.09);
  border: 1px solid rgba(43, 231, 218, 0.34);
}

.brand-line{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.5;
  color: var(--paper-dim);
}

.header-quick{
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
}

.quick-link{
  display: inline-flex;
  align-items: center;
  padding: 9px 15px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.2;
  color: var(--paper);
  background-color: transparent;
  border: 1px solid var(--grid-line);
  transition:
    color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease);
}
.quick-link:hover{
  color: var(--cyan);
  border-color: var(--cyan);
  background-color: rgba(43, 231, 218, 0.08);
}

.quick-link--cta{
  color: #0A1018;
  font-weight: 700;
  background-color: var(--orange);
  border-color: var(--orange);
}
.quick-link--cta:hover{
  color: #050B18;
  background-color: var(--cyan);
  border-color: var(--cyan);
}

.nav-toggle{
  display: none;
  align-items: center;
  gap: 9px;
  flex: none;
  padding: 10px 13px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1;
  color: var(--paper);
  background-color: transparent;
  border: 1px solid var(--grid-line);
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.nav-toggle:hover{ border-color: var(--cyan); color: var(--cyan); }

.nav-toggle__bars{
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
  flex: none;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content: "";
  position: absolute;
  inset-inline-start: 0;
  width: 100%;
  height: 1px;
  background-color: currentColor;
  transition: top var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}
.nav-toggle__bars::before{ top: 1px; }
.nav-toggle__bars::after{ top: 7px; }

.site-header[data-open] .nav-toggle__bars::before{ top: 4px; transform: rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after{ top: 4px; transform: rotate(-45deg); }

.header-lower{
  position: sticky;
  top: 0;
  z-index: 45;
  background-color: var(--deck-blue);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(36, 51, 73, 0.85) 0 1px,
    transparent 1px 76px
  );
  border-bottom: 1px solid var(--grid-line);
}

.nav-index{
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
}

.nav-link{
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 15px clamp(11px, 1.6vw, 22px);
  font-size: 14px;
  letter-spacing: 0.01em;
  line-height: 1.4;
  color: var(--paper-dim);
  border-bottom: 2px solid transparent;
  transition:
    color var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}
.nav-link:hover{
  color: var(--paper);
  background-color: rgba(43, 231, 218, 0.07);
}

.nav-link__num{
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  line-height: 1;
  color: var(--paper-dim);
  opacity: 0.55;
  transition: color var(--t-fast) var(--ease), opacity var(--t-fast) var(--ease);
}
.nav-link:hover .nav-link__num{ color: var(--cyan); opacity: 1; }

.nav-link[aria-current="page"]{
  color: var(--paper);
  border-bottom-color: var(--cyan);
  background-color: rgba(43, 231, 218, 0.09);
}
.nav-link[aria-current="page"] .nav-link__num{
  color: var(--cyan);
  opacity: 1;
}

.scroll-progress{
  position: fixed;
  inset-block-start: 0;
  inset-inline-start: 0;
  width: 100%;
  height: 3px;
  z-index: 80;
  pointer-events: none;
  background-image: linear-gradient(90deg, var(--cyan), var(--orange));
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

/* ---------- 7. 站脚 ---------- */
.site-footer{
  position: relative;
  margin-block-start: clamp(64px, 8vw, 120px);
  background-color: var(--ink-void);
  border-top: 1px solid var(--grid-line);
  color: var(--paper);
}
.site-footer::before{
  content: "";
  position: absolute;
  inset-block-start: -1px;
  inset-inline-start: 0;
  width: min(280px, 42%);
  height: 2px;
  background-image: linear-gradient(90deg, var(--cyan), var(--orange));
}

.footer-grid{
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr) minmax(0, 1.25fr);
  gap: clamp(28px, 4vw, 56px) clamp(24px, 4vw, 64px);
  padding-block: clamp(40px, 6vw, 76px) clamp(32px, 4vw, 52px);
}

.footer-brand{
  position: relative;
  padding-inline-start: 16px;
  border-inline-start: 1px solid var(--grid-line);
}
.footer-brand::before{
  content: "";
  position: absolute;
  inset-block-start: -1px;
  inset-inline-start: -1px;
  width: 1px;
  height: 48px;
  background-color: var(--cyan);
}

.footer-brand__name{
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.6vw, 30px);
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--paper);
  transition: color var(--t-fast) var(--ease);
}
.footer-brand__name:hover{ color: var(--cyan); }

.footer-brand__line{
  margin-block-start: 12px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-dim);
}

.plate-code{
  display: inline-block;
  margin-block-start: 18px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  line-height: 1.5;
  color: var(--paper-dim);
  border: 1px solid var(--grid-line);
}

.footer-heading{
  margin-block-end: 16px;
  padding-block-end: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  line-height: 1.5;
  color: var(--cyan);
  border-bottom: 1px solid var(--grid-line);
}

.footer-nav__list{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 24px;
}
.footer-nav__list a{
  display: block;
  padding-block: 7px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper-dim);
  transition: color var(--t-fast) var(--ease), padding-inline-start var(--t-fast) var(--ease);
}
.footer-nav__list a:hover{
  color: var(--cyan);
  padding-inline-start: 4px;
}

.contact-list li{
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding-block: 7px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
  border-bottom: 1px dashed rgba(36, 51, 73, 0.9);
  word-break: break-word;
}
.contact-list li:last-child{ border-bottom: 0; }

.contact-list__key{
  flex: none;
  min-width: 40px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 2.1;
  color: var(--paper-dim);
}

.footer-note{
  margin-block-start: 14px;
  font-size: 12px;
  line-height: 1.75;
  color: var(--paper-dim);
}

.footer-legal{
  background-color: var(--deck-blue);
  border-top: 1px solid var(--grid-line);
}

.footer-legal__inner{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px clamp(14px, 3vw, 36px);
  padding-block: 15px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--paper);
}

.footer-legal__icp{ color: var(--paper); }
.footer-legal__region{ color: var(--paper-dim); }
.footer-legal__copy{ color: var(--paper-dim); }

.legal-links{
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin-inline-start: auto;
}
.legal-links a{
  color: var(--paper-dim);
  transition: color var(--t-fast) var(--ease);
}
.legal-links a:hover{ color: var(--cyan); }

/* ---------- 8. 通用按钮 ---------- */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  line-height: 1.2;
  color: var(--paper);
  background-color: transparent;
  border: 1px solid var(--grid-line);
  transition:
    transform var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}
.btn:hover{ transform: translateY(-2px); }

.btn--primary{
  color: #0A1018;
  font-weight: 700;
  background-color: var(--orange);
  border-color: var(--orange);
}
.btn--primary:hover{
  color: #050B18;
  background-color: var(--cyan);
  border-color: var(--cyan);
}

.btn--ghost{
  color: var(--cyan);
  border-color: var(--cyan);
}
.btn--ghost:hover{ background-color: rgba(43, 231, 218, 0.12); }

.btn--paper{
  color: var(--on-paper);
  font-weight: 700;
  background-color: var(--paper);
  border-color: var(--paper);
}
.btn--paper:hover{
  background-color: #FFFFFF;
  border-color: var(--cyan);
}

/* ---------- 9. 标签与引导字 ---------- */
.tag{
  display: inline-block;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.4;
  color: var(--paper-dim);
  background-color: rgba(13, 26, 46, 0.62);
  border: 1px solid var(--grid-line);
}
.tag--cyan{
  color: var(--cyan);
  border-color: rgba(43, 231, 218, 0.42);
}
.tag--live{
  color: var(--lime);
  border-color: rgba(182, 255, 61, 0.42);
}
.tag--alert{
  color: var(--red);
  border-color: rgba(255, 77, 94, 0.42);
}

.eyebrow{
  display: block;
  margin-block-end: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  line-height: 1.5;
  text-transform: uppercase;
  color: var(--cyan);
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb{
  padding-block: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.6;
  color: var(--paper-dim);
  border-bottom: 1px solid var(--grid-line);
}
.breadcrumb__list{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.breadcrumb__item{
  display: flex;
  align-items: center;
  gap: 10px;
}
.breadcrumb__link{
  color: var(--paper-dim);
  transition: color var(--t-fast) var(--ease);
}
.breadcrumb__link:hover{ color: var(--cyan); }
.breadcrumb__sep{ color: var(--grid-line); }
.breadcrumb [aria-current="page"]{ color: var(--paper); }

/* ---------- 11. 卡片与展签 ---------- */
.card{
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(18px, 2.2vw, 28px);
  background-color: var(--deck-blue);
  border: 1px solid var(--grid-line);
  transition:
    transform var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}
.card:hover{
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.card--plaque{
  background-color: var(--paper);
  border-color: var(--paper);
  color: var(--on-paper);
}
.card--plaque:hover{
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.card__title{
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.05rem, 1.8vw, 1.35rem);
  letter-spacing: -0.01em;
  line-height: 1.32;
}

.card__text{
  font-size: 15px;
  line-height: 1.8;
  color: var(--paper-dim);
}
.card--plaque .card__text{
  color: var(--on-paper);
  opacity: 0.72;
}

.plate{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  align-self: flex-start;
  padding: 3px 7px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  line-height: 1.5;
  color: var(--cyan);
  border: 1px solid currentColor;
}
.card--plaque .plate{ color: var(--on-paper); opacity: 0.6; }

/* ---------- 12. 章节索引带 ---------- */
.index-rail{
  padding: 16px;
  background-color: rgba(13, 26, 46, 0.6);
  border: 1px solid var(--grid-line);
}
.index-rail__title{
  margin-block-end: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  line-height: 1.5;
  color: var(--cyan);
}
.index-rail__list{
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.index-rail__link{
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 8px 8px 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--paper-dim);
  border-inline-start: 2px solid transparent;
  transition:
    color var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}
.index-rail__link:hover{
  color: var(--paper);
  background-color: rgba(43, 231, 218, 0.07);
  border-inline-start-color: var(--cyan);
}
.index-rail__num{
  flex: none;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

/* ---------- 13. 媒体容器 ---------- */
.media{
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background-color: var(--deck-blue);
  background-image:
    linear-gradient(135deg, rgba(43, 231, 218, 0.1), transparent 58%),
    repeating-linear-gradient(0deg, rgba(36, 51, 73, 0.85) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(90deg, rgba(36, 51, 73, 0.85) 0 1px, transparent 1px 32px);
  border: 1px solid var(--grid-line);
}
.media img{
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--wide{ aspect-ratio: 21 / 9; }
.media--tall{ aspect-ratio: 3 / 4; }
.media--square{ aspect-ratio: 1 / 1; }

.media__caption{
  position: absolute;
  inset-block-end: 0;
  inset-inline-start: 0;
  max-width: min(100%, 340px);
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  line-height: 1.6;
  color: var(--paper);
  background-color: rgba(5, 11, 24, 0.86);
  border-top: 1px solid var(--cyan);
}

/* ---------- 14. 数据与信号 ---------- */
.stat{
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-block: 14px;
  border-top: 1px solid var(--grid-line);
}
.stat__num{
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  letter-spacing: 0.02em;
  line-height: 1;
  color: var(--cyan);
}
.stat__label{
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  line-height: 1.6;
  color: var(--paper-dim);
}

.signal-dot{
  position: relative;
  display: inline-block;
  width: 7px;
  height: 7px;
  flex: none;
  background-color: var(--lime);
}
.signal-dot::after{
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid var(--lime);
  animation: signal-pulse 2.4s ease-out infinite;
}
@keyframes signal-pulse{
  0%   { transform: scale(1);   opacity: 0.9; }
  70%  { transform: scale(2.4); opacity: 0; }
  100% { transform: scale(2.4); opacity: 0; }
}

/* ---------- 15. 回到页首 ---------- */
.to-top{
  position: fixed;
  inset-block-end: clamp(16px, 3vw, 28px);
  inset-inline-end: clamp(16px, 3vw, 28px);
  z-index: 70;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
  color: var(--cyan);
  background-color: var(--deck-blue);
  border: 1px solid var(--cyan);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition:
    opacity var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease);
}
.to-top[data-visible]{
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}
.to-top:hover{ background-color: rgba(43, 231, 218, 0.16); }

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1040px){
  .grid--split{ grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .grid--thirds{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid{
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .footer-contact{ grid-column: 1 / -1; }
}

@media (max-width: 900px){
  .nav-toggle{ display: inline-flex; }
  .header-quick{ display: none; }
  .header-upper__inner{ min-height: 66px; }

  .header-lower{
    display: none;
    position: static;
    background-image: none;
    border-bottom: 1px solid var(--grid-line);
  }
  .site-header[data-open] .header-lower{ display: block; }

  .nav-index{ flex-direction: column; }
  .nav-link{
    width: 100%;
    padding: 14px 18px;
    font-size: 15px;
    border-bottom: 1px solid var(--grid-line);
    border-inline-start: 2px solid transparent;
  }
  .nav-link:last-child{ border-bottom: 0; }
  .nav-link[aria-current="page"]{
    border-bottom-color: var(--grid-line);
    border-inline-start-color: var(--cyan);
  }
}

@media (max-width: 720px){
  .grid--split,
  .grid--halves,
  .grid--thirds{ grid-template-columns: minmax(0, 1fr); }

  .footer-grid{
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }
  .footer-brand{ padding-inline-start: 14px; }

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

  .footer-legal__inner{ gap: 6px 16px; }
  .legal-links{ margin-inline-start: 0; width: 100%; }

  .section__lead{ margin-inline-start: 0; }
}

@media (max-width: 420px){
  .brand{ font-size: 19px; }
  .brand-line{ font-size: 10px; letter-spacing: 0.08em; }
  .nav-toggle{ padding: 9px 11px; }
}

/* ---------- 17. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }

  *,
  *::before,
  *::after{
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .card:hover,
  .card--plaque:hover,
  .btn:hover{ transform: none; }

  .signal-dot::after{ animation: none; opacity: 0; }
}