/* ==========================================================================
   四季体育安装 · site.css
   共享外壳：顶部状态窄条 + 品牌横梁 + 左侧书脊导航 + 半场弧页脚
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#0B1B33;
  --ink-2:#12294A;
  --ink-3:#081426;
  --paper:#F3EEE4;
  --paper-2:#E4DCCC;
  --orange:#FF6A13;
  --green:#1F8A44;
  --green-lt:#37B26A;
  --silver:#B9C2CC;
  --violet:#7B5CFF;
  --live:#E63946;

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

  --shell-top:104px;
  --spine:96px;
  --gutter:clamp(18px,4.2vw,52px);
  --container:1240px;
  --radius-lg:20px;
  --radius-md:12px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

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

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--shell-top) + 18px);
}

body{
  margin:0;
  padding-top:var(--shell-top);
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{ margin:0; }
h1,h2,h3,h4{ font-weight:800; letter-spacing:-.01em; line-height:1.22; }

ul,ol{ margin:0; padding:0; }
.site-nav__list,
.footer-col ul,
.footer-contact__list{ list-style:none; }

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

a{ color:inherit; }

code,kbd,samp,pre{ font-family:var(--font-mono); }

button{ font:inherit; color:inherit; }

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

/* ---------- 3. 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:-72px;
  left:14px;
  z-index:200;
  padding:12px 20px;
  background:var(--orange);
  color:#08111F;
  font-weight:700;
  font-size:14px;
  text-decoration:none;
  border-radius:0 0 10px 10px;
  transition:top .2s var(--ease);
}
.skip-link:focus{ top:0; }

/* ---------- 4. 页头外壳 ---------- */
.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:60;
  background:var(--ink);
  color:var(--paper);
}

/* 4.1 顶部状态窄条 */
.topline{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:38px;
  padding:0 var(--gutter);
  background:var(--ink-3);
  border-bottom:1px solid rgba(185,194,204,.16);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.13em;
  color:var(--silver);
}

.topline__phase{
  display:flex;
  align-items:center;
  gap:9px;
  min-width:0;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.pulse-dot{
  flex:0 0 auto;
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--green-lt);
  animation:pulse-dot 2.4s ease-in-out infinite;
}

@keyframes pulse-dot{
  0%,100%{ opacity:1; box-shadow:0 0 0 0 rgba(55,178,106,.55); }
  50%{ opacity:.42; box-shadow:0 0 0 6px rgba(55,178,106,0); }
}

.topline__meta{
  display:flex;
  align-items:center;
  gap:16px;
  flex:0 0 auto;
}

.topline__guide{
  color:var(--silver);
  text-decoration:none;
  border-bottom:1px solid transparent;
  padding-bottom:1px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.topline__guide:hover{ color:var(--orange); border-bottom-color:var(--orange); }

.topline__state{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--green-lt);
}
.topline__state::before{
  content:"";
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--green-lt);
}

/* 4.2 品牌横梁 */
.masthead{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:66px;
  padding:0 var(--gutter);
  background:var(--ink);
}

.brand{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:0;
  text-decoration:none;
  color:var(--paper);
}

.brand__mark{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:40px;
  height:40px;
  padding:0 2px;
  background:var(--orange);
  color:#08111F;
  font-size:14px;
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1;
  border-radius:12px 4px 12px 4px;
  transform:rotate(-3deg);
  transition:transform .24s var(--ease);
}
.brand:hover .brand__mark{ transform:rotate(0deg); }

.brand__text{
  display:flex;
  flex-direction:column;
  gap:1px;
  min-width:0;
}

.brand__name{
  font-size:15px;
  font-weight:800;
  letter-spacing:.02em;
  line-height:1.3;
}

.brand__tag{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.04em;
  color:var(--silver);
  line-height:1.4;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

/* 4.3 目录开关 */
.nav-toggle{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:40px;
  padding:0 16px;
  background:transparent;
  border:1px solid rgba(185,194,204,.34);
  border-radius:999px;
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease),background-color .2s var(--ease);
}
.nav-toggle:hover{ border-color:var(--orange); color:var(--orange); }
.nav-toggle[aria-expanded="true"]{ border-color:var(--orange); background:rgba(255,106,19,.14); }

.nav-toggle__bars{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:3px;
  width:16px;
  height:12px;
}
.nav-toggle__bars i{
  display:block;
  width:100%;
  height:2px;
  background:currentColor;
  border-radius:2px;
  transition:transform .24s var(--ease),opacity .18s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){ transform:translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){ opacity:0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){ transform:translateY(-5px) rotate(-45deg); }

.nav-toggle__text{
  font-size:11px;
  line-height:1;
}

/* 4.4 移动端导航面板 */
.site-nav{
  position:fixed;
  top:var(--shell-top);
  left:0;
  right:0;
  z-index:70;
  max-height:calc(100vh - var(--shell-top));
  overflow-y:auto;
  padding:14px var(--gutter) 26px;
  background:var(--ink);
  border-top:1px solid rgba(185,194,204,.16);
  opacity:0;
  visibility:hidden;
  transform:translateY(-14px);
  transition:opacity .22s var(--ease),transform .26s var(--ease),visibility .26s var(--ease);
}
.site-nav[data-open="true"]{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

.site-nav__list{
  display:flex;
  flex-direction:column;
  gap:4px;
}

.site-nav__item{ margin:0; }

.site-nav__link{
  position:relative;
  display:flex;
  flex-direction:row;
  align-items:center;
  gap:14px;
  padding:13px 12px 13px 16px;
  border-radius:10px;
  color:var(--paper);
  text-decoration:none;
  transition:color .2s var(--ease),background-color .2s var(--ease);
}
.site-nav__link::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:2px;
  height:0;
  border-radius:2px;
  background:var(--orange);
  transform:translateY(-50%);
  transition:height .24s var(--ease);
}
.site-nav__link:hover{ background:rgba(185,194,204,.08); }
.site-nav__link:hover::before{ height:58%; }

.site-nav__num{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:rgba(185,194,204,.6);
  transition:color .2s var(--ease);
}

.site-nav__label{
  font-size:15.5px;
  letter-spacing:.02em;
}

.site-nav__link[aria-current="page"]{
  background:rgba(255,106,19,.14);
  color:#FFFFFF;
}
.site-nav__link[aria-current="page"]::before{ height:72%; }
.site-nav__link[aria-current="page"] .site-nav__num{ color:var(--orange); }

.site-nav__foot{ padding-top:6px; }

.site-nav__cta{
  display:flex;
  align-items:center;
  justify-content:center;
  width:100%;
  min-height:46px;
  padding:0 20px;
  background:var(--orange);
  color:#08111F;
  font-size:14px;
  font-weight:700;
  text-decoration:none;
  border-radius:999px;
  transition:background-color .2s var(--ease);
}
.site-nav__cta:hover{ background:#FF8A4A; }

/* 4.5 阅读进度尺 */
.scroll-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:rgba(185,194,204,.16);
  overflow:hidden;
  pointer-events:none;
}
.scroll-meter__fill{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--silver) 0%,var(--orange) 100%);
  transition:width .1s linear;
}

/* ---------- 5. 页脚 ---------- */
.site-footer{
  position:relative;
  overflow:hidden;
  margin-top:clamp(64px,9vw,120px);
  background:var(--ink);
  color:var(--paper);
  border-top:1px solid rgba(185,194,204,.14);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-90px;
  right:-140px;
  width:440px;
  height:440px;
  border:1px solid rgba(185,194,204,.12);
  border-radius:50%;
  pointer-events:none;
}
.site-footer::after{
  content:"";
  position:absolute;
  left:-180px;
  bottom:-240px;
  width:520px;
  height:520px;
  border:1px solid rgba(255,106,19,.16);
  border-radius:50%;
  pointer-events:none;
}

.footer-inner{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:clamp(40px,6vw,76px) var(--gutter) 0;
}

.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1fr);
  gap:clamp(28px,4vw,44px);
}

.footer-brand__name{
  font-size:clamp(26px,3.6vw,42px);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.1;
  transform:skewX(-2deg);
  transform-origin:left bottom;
}

.footer-brand__tag{
  margin-top:14px;
  max-width:21em;
  font-size:13.5px;
  line-height:1.75;
  color:var(--silver);
}

.footer-col__title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--orange);
}

.footer-col ul{
  display:flex;
  flex-direction:column;
  gap:10px;
}

.footer-col a{
  display:inline-block;
  font-size:14px;
  color:var(--paper);
  text-decoration:none;
  opacity:.84;
  transition:opacity .2s var(--ease),color .2s var(--ease),transform .2s var(--ease);
}
.footer-col a:hover{
  opacity:1;
  color:var(--orange);
  transform:translateX(3px);
}

.footer-contact__list{
  display:flex;
  flex-direction:column;
  gap:12px;
  font-size:13.5px;
  line-height:1.7;
  color:var(--silver);
}
.footer-contact__list li{
  display:flex;
  align-items:baseline;
  gap:10px;
}
.footer-contact__key{
  flex:0 0 auto;
  min-width:3.4em;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  color:var(--orange);
}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 26px;
  margin-top:clamp(36px,5vw,58px);
  padding:20px 0 28px;
  border-top:1px solid rgba(185,194,204,.14);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--silver);
}

.footer-base__copy,
.footer-base__icp{ margin:0; }

.footer-base__legal{
  display:flex;
  flex-wrap:wrap;
  gap:16px;
}
.footer-base__legal a{
  color:var(--silver);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-base__legal a:hover{ color:var(--orange); border-bottom-color:var(--orange); }

/* ---------- 6. 通用容器与排版 ---------- */
.u-container{
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.u-container--narrow{ max-width:880px; }

.u-prose{
  max-width:34em;
  font-size:16.5px;
  line-height:1.8;
}
.u-prose p + p{ margin-top:1.1em; }
.u-prose h2{ margin-top:1.6em; font-size:clamp(24px,2.6vw,32px); }
.u-prose h3{ margin-top:1.4em; font-size:clamp(19px,2vw,23px); }
.u-prose strong{ color:var(--ink); }

.u-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--silver);
}
.u-eyebrow::before{
  content:"";
  width:16px;
  height:1px;
  background:var(--orange);
}

.u-lead{
  font-size:clamp(17px,1.9vw,22px);
  line-height:1.7;
  font-weight:500;
}

.u-nums{
  font-family:var(--font-mono);
  font-size:clamp(30px,4.4vw,58px);
  font-weight:700;
  letter-spacing:-.02em;
  line-height:1;
  font-variant-numeric:tabular-nums;
}

.u-rule{
  height:1px;
  border:0;
  background:rgba(185,194,204,.4);
  margin:0;
}

.u-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;
}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:46px;
  padding:0 24px;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-sans);
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn:hover{ transform:translateY(-1px); }
.btn:active{ transform:translateY(0); }

.btn--accent{ background:var(--orange); color:#08111F; }
.btn--accent:hover{ background:#FF8A4A; }

.btn--ghost{
  background:transparent;
  color:var(--paper);
  border-color:rgba(185,194,204,.42);
}
.btn--ghost:hover{ color:var(--orange); border-color:var(--orange); }

.btn--ink{ background:var(--ink); color:var(--paper); }
.btn--ink:hover{ background:var(--ink-2); }

.btn--sm{ min-height:38px; padding:0 18px; font-size:13px; }
.btn--xs{ min-height:28px; padding:0 13px; font-size:11px; letter-spacing:.08em; }

/* ---------- 8. 标签徽标 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border:1px solid rgba(185,194,204,.36);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.12em;
  color:var(--silver);
  white-space:nowrap;
}
.tag--accent{ color:var(--orange); border-color:rgba(255,106,19,.55); }
.tag--green{ color:var(--green-lt); border-color:rgba(55,178,106,.5); }
.tag--violet{ color:var(--violet); border-color:rgba(123,92,255,.5); }
.tag--live{ color:var(--live); border-color:rgba(230,57,70,.55); }
.tag--live::before{
  content:"";
  width:5px;
  height:5px;
  border-radius:50%;
  background:var(--live);
  animation:pulse-dot 2.4s ease-in-out infinite;
}

/* ---------- 9. 面板与数据单元 ---------- */
.panel{
  padding:clamp(18px,3vw,30px);
  background:var(--ink-2);
  border:1px solid rgba(185,194,204,.14);
  border-radius:var(--radius-lg);
  color:var(--paper);
}
.panel--paper{
  background:var(--paper);
  border-color:var(--paper-2);
  color:var(--ink);
}

.stat{
  display:flex;
  flex-direction:column;
  gap:8px;
  padding:clamp(14px,2.4vw,22px) 0;
}
.stat__label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--silver);
}
.stat__value{
  font-family:var(--font-mono);
  font-size:clamp(24px,3.2vw,44px);
  font-weight:700;
  letter-spacing:-.02em;
  line-height:1;
  color:var(--paper);
  font-variant-numeric:tabular-nums;
}
.panel--paper .stat__label{ color:#6B7A8C; }
.panel--paper .stat__value{ color:var(--ink); }

/* 行式列表 */
.data-row{
  position:relative;
  display:grid;
  grid-template-columns:3px minmax(0,1fr) auto;
  align-items:center;
  gap:14px;
  padding:14px 0;
  border-bottom:1px solid rgba(185,194,204,.18);
}
.data-row__bar{
  align-self:stretch;
  border-radius:2px;
  background:var(--silver);
}
.data-row__bar--green{ background:var(--green-lt); }
.data-row__bar--violet{ background:var(--violet); }
.data-row__bar--orange{ background:var(--orange); }
.data-row__body{ min-width:0; }
.data-row__title{
  font-size:15px;
  font-weight:700;
  line-height:1.45;
}
.data-row__desc{
  margin-top:2px;
  font-size:13px;
  line-height:1.6;
  color:#6B7A8C;
}
.data-row__time{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--silver);
  white-space:nowrap;
}

/* ---------- 10. 面包屑 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--silver);
}
.crumbs a{
  color:inherit;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.crumbs a:hover{ color:var(--orange); border-bottom-color:var(--orange); }
.crumbs__sep{ opacity:.45; }

/* ---------- 11. 图片容器基座 ---------- */
.figure{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 9;
  overflow:hidden;
  border-radius:var(--radius-lg);
  background:
    repeating-linear-gradient(135deg,rgba(185,194,204,.10) 0 8px,transparent 8px 16px),
    var(--ink-2);
  isolation:isolate;
}
.figure--wide{ aspect-ratio:21 / 9; }
.figure--tall{ aspect-ratio:4 / 5; }
.figure--paper{
  background:
    repeating-linear-gradient(135deg,rgba(11,27,51,.07) 0 8px,transparent 8px 16px),
    var(--paper-2);
}
.figure img,
.figure video{
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure__caption{
  position:absolute;
  left:0;
  bottom:0;
  right:0;
  z-index:2;
  padding:14px 18px;
  background:linear-gradient(180deg,rgba(8,20,38,0) 0%,rgba(8,20,38,.86) 100%);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
}
.figure--paper .figure__caption{
  background:linear-gradient(180deg,rgba(243,238,228,0) 0%,rgba(243,238,228,.92) 100%);
  color:var(--ink);
}

/* ---------- 12. 揭示动效协议 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
  will-change:opacity,transform;
}
[data-reveal][data-revealed="true"]{
  opacity:1;
  transform:none;
}

/* ---------- 13. 断点 ---------- */
@media (max-width:860px){
  .brand__tag{ display:none; }
}

@media (max-width:720px){
  .topline__guide,
  .topline__state{ display:none; }
  .topline{ font-size:10px; letter-spacing:.08em; }
  .nav-toggle__text{ display:none; }
  .nav-toggle{ padding:0 13px; }
}

@media (min-width:720px){
  .footer-grid{ grid-template-columns:repeat(2,minmax(0,1fr)); }
  .footer-brand{ grid-column:1 / -1; }
}

@media (min-width:1024px){
  .footer-grid{
    grid-template-columns:1.6fr .85fr .85fr .85fr 1.25fr;
    align-items:start;
  }
  .footer-brand{ grid-column:auto; }
}

/* 桌面书脊形态 */
@media (min-width:1080px){
  body{ padding-left:var(--spine); }

  .nav-toggle{ display:none; }
  .site-nav__foot{ display:none; }

  .site-nav{
    position:fixed;
    top:var(--shell-top);
    left:0;
    right:auto;
    bottom:0;
    width:var(--spine);
    max-height:none;
    margin:0;
    padding:18px 0 22px;
    overflow-y:auto;
    overflow-x:hidden;
    border-top:0;
    border-right:1px solid rgba(185,194,204,.16);
    background:linear-gradient(180deg,#0B1B33 0%,#081426 100%);
    opacity:1;
    visibility:visible;
    transform:none;
    transition:none;
    display:flex;
    flex-direction:column;
    z-index:55;
  }

  .site-nav__list{
    gap:2px;
    padding:0 8px;
  }

  .site-nav__link{
    flex-direction:column;
    align-items:flex-start;
    gap:4px;
    padding:12px 8px 12px 10px;
    border-radius:8px;
    color:var(--silver);
  }
  .site-nav__link:hover{ background:rgba(185,194,204,.08); color:var(--paper); }

  .site-nav__label{
    font-size:12.5px;
    line-height:1.25;
    letter-spacing:.01em;
  }

  .site-nav__num{ font-size:9.5px; }

  /* 进度尺在书脊形态下仍贴页头下沿 */
  .scroll-meter{ left:0; right:0; }
}

@media (min-width:1240px){
  :root{ --gutter:56px; }
}

/* ---------- 14. 无障碍降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }

  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
    scroll-behavior:auto !important;
  }

  [data-reveal]{
    opacity:1;
    transform:none;
  }
}