/* ============================================================
   星空体育赛事 · 观测站  共享样式表
   /assets/site.css
   ============================================================ */

/* ---------- 0. 设计变量 ---------- */
:root{
  --c-deep:#05070F;
  --c-cabin:#0D1424;
  --c-violet:#7C5CFF;
  --c-cyan:#38E1E1;
  --c-amber:#F2B23E;
  --c-amber-2:#FFD98A;
  --c-orange:#FF7A3D;
  --c-white:#F5F8FF;
  --c-rock:#6E7893;
  --c-cream:#EFE8DA;
  --c-clay:#C08464;
  --c-moss:#7E9B7A;

  --glass:rgba(13,20,36,.62);
  --glass-strong:rgba(13,20,36,.88);
  --line:rgba(110,120,147,.22);
  --line-violet:rgba(124,92,255,.32);
  --line-soft:rgba(110,120,147,.12);

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-data:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --wrap:min(1280px,92vw);
  --gap:clamp(14px,1.8vw,26px);
  --rhythm:clamp(48px,7vw,104px);
  --r-sm:6px;
  --r-md:12px;
  --r-lg:22px;

  --ease:cubic-bezier(.22,.68,.24,1);
  --t-fast:220ms;
  --t-base:380ms;
  --t-slow:520ms;

  --scroll-progress:0;
}

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

html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:120px;
}

body{
  margin:0;
  min-height:100vh;
  background-color:var(--c-deep);
  background-image:
    radial-gradient(1100px 620px at 78% -12%, rgba(124,92,255,.20), transparent 62%),
    radial-gradient(900px 520px at 4% 6%, rgba(56,225,225,.09), transparent 58%),
    radial-gradient(820px 820px at 52% 118%, rgba(242,178,62,.06), transparent 62%);
  background-repeat:no-repeat;
  color:var(--c-white);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  overflow-x:hidden;
}

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

h1,h2,h3,h4,h5,h6,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}

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

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

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

table{border-collapse:collapse;border-spacing:0}

hr{border:0}

:focus-visible{
  outline:2px solid var(--c-cyan);
  outline-offset:3px;
  border-radius:4px;
}

::selection{background:rgba(124,92,255,.55);color:var(--c-white)}

/* ---------- 2. 中文排版与字号层级 ---------- */
.t-display{
  font-family:var(--font-display);
  font-size:clamp(38px,6.6vw,96px);
  line-height:.96;
  font-weight:800;
  letter-spacing:-.02em;
}

.t-chapter{
  font-family:var(--font-display);
  font-size:clamp(24px,3.2vw,42px);
  line-height:1.14;
  font-weight:800;
  letter-spacing:-.015em;
}

.t-sub{
  font-size:clamp(17px,1.6vw,21px);
  line-height:1.4;
  font-weight:700;
  letter-spacing:0;
}

.t-body{
  font-size:17px;
  line-height:1.78;
  max-width:68ch;
  color:rgba(245,248,255,.86);
}

.t-note{
  font-size:13px;
  line-height:1.65;
  letter-spacing:.02em;
  color:var(--c-rock);
}

.u-num{
  font-family:var(--font-data);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:-.01em;
}

.u-visually-hidden{
  position:absolute !important;
  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;
}

/* ---------- 3. 布局骨架 ---------- */
.wrap{
  width:var(--wrap);
  margin-inline:auto;
}

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

.col-rail{grid-column:1 / span 2}
.col-main{grid-column:4 / span 7}
.col-aside{grid-column:11 / span 2}

.section{padding-block:clamp(36px,5.4vw,80px)}

.section__lede{
  font-size:clamp(16px,1.5vw,19px);
  line-height:1.8;
  max-width:62ch;
  color:rgba(245,248,255,.82);
}

.divider{
  height:1px;
  background:linear-gradient(90deg,transparent,var(--line),transparent);
  margin-block:clamp(26px,3.4vw,52px);
}

.guide-line{
  height:1px;
  background:linear-gradient(90deg,rgba(124,92,255,.85),rgba(56,225,225,0));
  transform:rotate(-12deg);
  transform-origin:left center;
  pointer-events:none;
}

/* ---------- 4. 通用表面与卡片 ---------- */
.glass{
  background:var(--glass);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
  border:1px solid var(--line-violet);
  border-radius:var(--r-md);
  padding:var(--gap);
}

.plate{
  background:var(--c-cabin);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  padding:var(--gap);
}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 22px;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-body);
  font-size:14.5px;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1;
  white-space:nowrap;
  cursor:pointer;
  transition:
    transform var(--t-fast) var(--ease),
    box-shadow var(--t-fast) var(--ease),
    background-color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease),
    color var(--t-fast) var(--ease);
}

.btn--primary{
  background:linear-gradient(110deg,var(--c-violet),var(--c-cyan));
  color:#04060E;
  box-shadow:0 10px 28px -14px rgba(124,92,255,.95);
}
.btn--primary:hover{
  transform:translateY(-1px);
  box-shadow:0 16px 38px -16px rgba(56,225,225,.9);
}

.btn--ghost{
  background:transparent;
  border-color:rgba(124,92,255,.45);
  color:var(--c-white);
}
.btn--ghost:hover{
  border-color:var(--c-cyan);
  color:var(--c-cyan);
}

/* ---------- 6. 跳转链接 ---------- */
.skip-link{
  position:fixed;
  left:16px;
  top:-80px;
  z-index:200;
  display:inline-block;
  padding:10px 20px;
  background:var(--c-cyan);
  color:#04060E;
  font-size:14px;
  font-weight:700;
  border-radius:0 0 var(--r-sm) var(--r-sm);
  transition:top var(--t-fast) var(--ease);
}
.skip-link:focus{top:0}

/* ---------- 7. 刊头 ---------- */
.masthead{
  position:sticky;
  top:0;
  z-index:70;
  background:linear-gradient(180deg,rgba(5,7,15,.97),rgba(5,7,15,.88));
  -webkit-backdrop-filter:blur(20px) saturate(150%);
  backdrop-filter:blur(20px) saturate(150%);
  border-bottom:1px solid var(--line);
  color:var(--c-white);
}

.masthead::before{
  content:"";
  position:absolute;
  left:0;
  bottom:-1px;
  z-index:2;
  height:2px;
  width:calc(var(--scroll-progress,0) * 100%);
  background:linear-gradient(90deg,var(--c-violet),var(--c-cyan));
  opacity:0;
  pointer-events:none;
}
.masthead.is-scrolled::before{opacity:1}

.masthead__inner{
  width:var(--wrap);
  margin-inline:auto;
}

.masthead__plate{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:var(--gap);
  padding-block:18px 13px;
  border-bottom:1px solid var(--line-soft);
}

/* 遥测读数 */
.telemetry{
  grid-column:1;
  justify-self:start;
  display:flex;
  align-items:center;
  gap:18px;
  min-width:0;
}

.telemetry__cell{
  display:inline-flex;
  align-items:baseline;
  gap:7px;
  white-space:nowrap;
}

.telemetry__key{
  font-size:11.5px;
  letter-spacing:.16em;
  color:var(--c-rock);
  text-transform:uppercase;
}

.telemetry__val{
  font-size:13.5px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--c-white);
}

.telemetry__val--ok{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--c-moss);
  font-weight:600;
}

.telemetry__dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--c-moss);
  box-shadow:0 0 9px rgba(126,155,122,.95);
}

/* 品牌报头 */
.masthead__brand{
  grid-column:2;
  justify-self:center;
  line-height:1;
}

.masthead__brand-link{
  display:inline-flex;
  align-items:baseline;
  gap:9px;
  padding:4px 2px;
  border-radius:var(--r-sm);
}

.masthead__brand-name{
  font-family:var(--font-display);
  font-size:clamp(20px,2.35vw,29px);
  font-weight:800;
  letter-spacing:-.02em;
  color:var(--c-white);
}

.masthead__brand-dot{
  font-size:18px;
  color:var(--c-violet);
  transform:translateY(-2px);
}

.masthead__brand-sub{
  font-size:clamp(12px,1.1vw,14px);
  font-weight:600;
  letter-spacing:.22em;
  color:var(--c-rock);
}

/* 移动端开关 */
.nav-toggle{
  grid-column:3;
  justify-self:end;
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 15px;
  border:1px solid var(--line-violet);
  border-radius:999px;
  background:rgba(13,20,36,.72);
  color:var(--c-white);
  font-size:13px;
  font-weight:600;
  letter-spacing:.06em;
  transition:border-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease);
}
.nav-toggle:hover{border-color:var(--c-violet)}

.nav-toggle__label{line-height:1}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:5px;width:16px}
.nav-toggle__bar{
  display:block;
  width:16px;
  height:1.5px;
  background:currentColor;
  transition:transform var(--t-fast) var(--ease);
}
.nav-toggle.is-active .nav-toggle__bar:nth-child(1){transform:translateY(3.25px) rotate(45deg)}
.nav-toggle.is-active .nav-toggle__bar:nth-child(2){transform:translateY(-3.25px) rotate(-45deg)}

/* 下层导航 rail */
.masthead__rail{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:var(--gap);
  padding-block:6px 14px;
}

.primary-nav{
  grid-column:2;
  min-width:0;
}

.primary-nav__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:clamp(4px,1.1vw,16px);
}

.primary-nav__item{display:block}

.primary-nav__link{
  position:relative;
  display:inline-block;
  padding:8px 6px 12px;
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  color:var(--c-rock);
  transition:color var(--t-fast) var(--ease);
  white-space:nowrap;
}

.primary-nav__link::after{
  content:"";
  position:absolute;
  left:6px;
  right:6px;
  bottom:6px;
  height:2px;
  background:linear-gradient(90deg,var(--c-violet),var(--c-cyan));
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--t-base) var(--ease);
}

.primary-nav__link:hover{color:var(--c-white)}
.primary-nav__link:hover::after{transform:scaleX(1)}

.primary-nav__link[aria-current="page"]{color:var(--c-white)}
.primary-nav__link[aria-current="page"]::after{transform:scaleX(1)}

.primary-nav__link[aria-current="page"]::before{
  content:"";
  position:absolute;
  left:50%;
  top:-1px;
  width:5px;
  height:5px;
  margin-left:-2.5px;
  border-radius:50%;
  background:var(--c-cyan);
  box-shadow:0 0 10px var(--c-cyan);
}

/* 右侧工具区 */
.masthead__actions{
  grid-column:3;
  justify-self:end;
  display:flex;
  align-items:center;
  gap:14px;
  min-width:0;
}

.league-switch{
  display:flex;
  align-items:center;
  gap:10px;
  min-width:0;
}

.league-switch__key{
  font-size:11.5px;
  letter-spacing:.16em;
  color:var(--c-rock);
  text-transform:uppercase;
  white-space:nowrap;
}

.league-switch__track{
  display:flex;
  align-items:center;
  gap:2px;
  padding:3px;
  max-width:100%;
  overflow-x:auto;
  border:1px solid var(--line);
  border-radius:999px;
  background:rgba(13,20,36,.62);
  scrollbar-width:none;
  -ms-overflow-style:none;
}
.league-switch__track::-webkit-scrollbar{display:none}

.league-switch__chip{
  flex:0 0 auto;
  padding:5px 12px;
  border-radius:999px;
  font-size:13px;
  font-weight:600;
  letter-spacing:.02em;
  color:var(--c-rock);
  transition:color var(--t-fast) var(--ease),background-color var(--t-fast) var(--ease);
}
.league-switch__chip:hover{color:var(--c-white)}
.league-switch__chip[aria-pressed="true"]{
  background:linear-gradient(110deg,var(--c-violet),var(--c-cyan));
  color:#04060E;
}

/* ---------- 8. 章节头 ---------- */
.chapter{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  align-items:end;
  gap:6px 18px;
  margin-bottom:clamp(20px,3vw,34px);
}

.chapter__num{
  grid-row:1 / span 2;
  font-family:var(--font-data);
  font-size:clamp(36px,5vw,70px);
  font-weight:700;
  line-height:.86;
  letter-spacing:-.04em;
  color:var(--c-clay);
}

.chapter__title{
  font-family:var(--font-display);
  font-size:clamp(20px,2.25vw,32px);
  font-weight:800;
  line-height:1.16;
  letter-spacing:-.02em;
  color:var(--c-white);
}

.chapter__rule{
  position:relative;
  height:1px;
  background:linear-gradient(90deg,rgba(124,92,255,.8),rgba(56,225,225,0));
}
.chapter__rule::after{
  content:"";
  position:absolute;
  right:0;
  top:-1px;
  width:34px;
  height:3px;
  background:var(--c-cyan);
  opacity:.55;
}

/* ---------- 9. 指标卡 ---------- */
.metric{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:18px 20px;
  background:var(--c-cabin);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  transition:border-color var(--t-fast) var(--ease),box-shadow var(--t-fast) var(--ease);
}
.metric:hover{
  border-color:var(--line-violet);
  box-shadow:0 20px 46px -30px rgba(124,92,255,.95);
}

.metric__value{
  font-family:var(--font-data);
  font-size:clamp(26px,3.4vw,44px);
  font-weight:700;
  line-height:1;
  letter-spacing:-.02em;
  font-variant-numeric:tabular-nums;
}

.metric__label{
  font-size:12.5px;
  letter-spacing:.1em;
  color:var(--c-rock);
}

.metric--tackle .metric__value{color:var(--c-cyan)}

.metric--pass .metric__value{
  background:linear-gradient(100deg,var(--c-amber),var(--c-amber-2));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}

.metric--goals .metric__value{color:var(--c-orange)}

/* ---------- 10. 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:5px;
  padding:3px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  font-size:12.5px;
  font-weight:600;
  letter-spacing:.04em;
  color:var(--c-rock);
  white-space:nowrap;
}

.tag--cyan{border-color:rgba(56,225,225,.45);color:var(--c-cyan)}
.tag--amber{border-color:rgba(242,178,62,.45);color:var(--c-amber)}
.tag--violet{border-color:var(--line-violet);color:var(--c-violet)}
.tag--moss{border-color:rgba(126,155,122,.5);color:var(--c-moss)}

/* ---------- 11. 数据表 ---------- */
.data-table__wrap{
  width:100%;
  overflow-x:auto;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:var(--c-cabin);
  -webkit-overflow-scrolling:touch;
}

.data-table{
  width:100%;
  min-width:560px;
  font-size:15px;
}

.data-table th{
  padding:11px 14px;
  text-align:left;
  font-size:12px;
  font-weight:700;
  letter-spacing:.12em;
  color:var(--c-rock);
  border-bottom:1px solid var(--line);
  white-space:nowrap;
}

.data-table td{
  padding:13px 14px;
  border-bottom:1px solid var(--line-soft);
  color:rgba(245,248,255,.9);
  font-variant-numeric:tabular-nums;
}

.data-table tbody tr:last-child td{border-bottom:0}
.data-table tbody tr{transition:background-color var(--t-fast) var(--ease)}
.data-table tbody tr:hover{background:rgba(124,92,255,.08)}

/* ---------- 12. 图片容器基础规则 ---------- */
.figure{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:
    radial-gradient(400px 220px at 24% 18%, rgba(124,92,255,.28), transparent 68%),
    linear-gradient(165deg,#0D1424,#05070F);
  isolation:isolate;
}

.figure::after{
  content:"";
  position:absolute;
  inset:0;
  background:repeating-linear-gradient(0deg,rgba(245,248,255,.035) 0 1px,transparent 1px 4px);
  pointer-events:none;
  mix-blend-mode:screen;
}

.figure img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.82) contrast(1.06) brightness(.86) hue-rotate(-6deg);
  transition:transform var(--t-slow) var(--ease);
}
.figure:hover img{transform:scale(1.025)}

.figure--wide{aspect-ratio:16 / 9}
.figure--square{aspect-ratio:1 / 1}
.figure--tall{aspect-ratio:3 / 4}

.figure__caption{
  margin-top:10px;
  font-size:12.5px;
  line-height:1.6;
  letter-spacing:.02em;
  color:var(--c-rock);
}

/* ---------- 13. 面包屑 ---------- */
.breadcrumb{padding-block:18px 0}

.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--c-rock);
}

.breadcrumb__list li{display:inline-flex;align-items:center;gap:8px}

.breadcrumb__list li + li::before{
  content:"/";
  color:rgba(110,120,147,.5);
}

.breadcrumb__link{
  color:var(--c-rock);
  transition:color var(--t-fast) var(--ease);
}
.breadcrumb__link:hover{color:var(--c-cyan)}

.breadcrumb__current{color:var(--c-white);font-weight:600}

/* ---------- 14. 进入视口显现 ---------- */
.reveal--pending{
  opacity:0;
  transform:translateY(22px) scale(.99);
  transition:opacity var(--t-slow) var(--ease),transform var(--t-slow) var(--ease);
}
.reveal--shown{
  opacity:1;
  transform:none;
}

/* ---------- 15. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:var(--rhythm);
  background:
    radial-gradient(900px 320px at 8% 0%, rgba(124,92,255,.16), transparent 70%),
    radial-gradient(700px 300px at 92% 10%, rgba(56,225,225,.09), transparent 72%),
    linear-gradient(180deg,rgba(13,20,36,.55),rgba(5,7,15,.98) 46%);
  border-top:1px solid var(--line);
  color:var(--c-white);
}

.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto;
  height:1px;
  background:linear-gradient(90deg,transparent,var(--c-violet),var(--c-cyan),transparent);
  opacity:.7;
}

.site-footer__inner{
  width:var(--wrap);
  margin-inline:auto;
  padding-block:clamp(42px,5.4vw,80px) 28px;
}

.site-footer__grid{
  display:grid;
  grid-template-columns:1.35fr 1fr 1fr 1.25fr;
  gap:clamp(24px,3.4vw,56px);
}

.footer-col{min-width:0}

.footer-col__title{
  font-size:12px;
  font-weight:700;
  letter-spacing:.2em;
  color:var(--c-rock);
  text-transform:uppercase;
  margin-bottom:16px;
}

.footer-brand{
  font-family:var(--font-display);
  font-size:clamp(19px,1.9vw,24px);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.2;
  color:var(--c-white);
}

.footer-brand__dot{
  color:var(--c-violet);
  margin-inline:6px;
}

.footer-note{
  margin-top:12px;
  font-size:13.5px;
  line-height:1.75;
  color:var(--c-rock);
  max-width:34ch;
}

.footer-icp{
  margin-top:16px;
  font-size:12.5px;
  letter-spacing:.06em;
  color:rgba(110,120,147,.85);
}

.footer-list{
  display:flex;
  flex-direction:column;
  gap:10px;
  font-size:14px;
  line-height:1.7;
  color:rgba(245,248,255,.72);
}

.footer-list--links a{
  color:rgba(245,248,255,.72);
  transition:color var(--t-fast) var(--ease);
}
.footer-list--links a:hover{color:var(--c-cyan)}

.footer-list--contact{gap:12px}

.footer-contact__key{
  display:inline-block;
  min-width:36px;
  margin-right:8px;
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--c-rock);
}

.footer-contact__val{
  font-size:13.5px;
  line-height:1.7;
  color:rgba(245,248,255,.82);
  word-break:break-word;
}

.site-footer__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-top:clamp(32px,4vw,60px);
  padding-top:20px;
  border-top:1px solid var(--line-soft);
}

.footer-base__note{
  font-size:12.5px;
  line-height:1.7;
  color:var(--c-rock);
  max-width:62ch;
}

.footer-base__meta{
  font-size:12.5px;
  letter-spacing:.04em;
  color:rgba(110,120,147,.85);
  white-space:nowrap;
}

/* ---------- 16. 响应式 ---------- */
@media (max-width:1180px){
  .obs-grid{grid-template-columns:repeat(8,minmax(0,1fr))}
  .col-rail{grid-column:1 / span 2}
  .col-main{grid-column:3 / span 6}
  .col-aside{grid-column:1 / span 8}
}

@media (max-width:1024px){
  .site-footer__grid{grid-template-columns:1fr 1fr}
  .footer-col--brand{grid-column:1 / -1}
}

@media (max-width:900px){
  .nav-toggle{display:inline-flex}

  .masthead__plate{
    grid-template-columns:auto minmax(0,1fr);
    padding-block:14px 12px;
  }
  .telemetry{display:none}
  .masthead__brand{grid-column:1;justify-self:start}
  .nav-toggle{grid-column:2}

  .masthead__rail{
    grid-template-columns:minmax(0,1fr);
    gap:12px;
    padding-block:0 16px;
  }

  .primary-nav{
    position:fixed;
    top:0;
    right:0;
    bottom:0;
    left:auto;
    z-index:80;
    width:min(86vw,340px);
    padding:104px 22px 44px;
    overflow-y:auto;
    overscroll-behavior:contain;
    background:linear-gradient(200deg,#0D1424 0%,#05070F 100%);
    border-left:1px solid var(--line-violet);
    box-shadow:-28px 0 70px -34px rgba(0,0,0,.95);
    transform:translateX(103%);
    transition:transform var(--t-base) var(--ease);
  }

  .masthead__rail[data-open] .primary-nav{transform:translateX(0)}

  .primary-nav__list{
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:2px;
  }

  .primary-nav__link{
    display:block;
    padding:14px 14px;
    font-size:17px;
    border-radius:10px;
  }
  .primary-nav__link::after{
    left:14px;
    right:auto;
    bottom:10px;
    width:22px;
    height:2px;
  }
  .primary-nav__link[aria-current="page"]::before{
    left:14px;
    top:50%;
    margin-top:-2.5px;
    margin-left:0;
  }

  .masthead__actions{
    grid-column:1;
    justify-self:stretch;
    flex-direction:column;
    align-items:stretch;
    gap:10px;
    width:100%;
  }

  .league-switch{
    justify-content:space-between;
    width:100%;
  }
  .league-switch__track{flex:1 1 auto}

  .masthead__actions .btn--primary{width:100%}
}

@media (max-width:760px){
  body{font-size:16px}

  .obs-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
  .col-rail,
  .col-main,
  .col-aside{grid-column:1 / -1}

  .site-footer__grid{grid-template-columns:1fr;gap:30px}

  .site-footer__base{flex-direction:column;align-items:flex-start}

  .chapter{grid-template-columns:auto minmax(0,1fr);gap:4px 14px}
}

@media (max-width:480px){
  .masthead__brand-dot{display:none}
  .masthead__brand-sub{letter-spacing:.16em}
  .league-switch__key{display:none}
}

/* ---------- 17. 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;
    scroll-behavior:auto !important;
  }

  .reveal--pending{opacity:1;transform:none}
  .figure:hover img{transform:none}
}