/* ==========================================================================
   四季体育安装 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ========================================================================== */

/* ---------- 变量 ---------- */
:root{
  --ink-deep:#12352E;
  --ink:#14161A;
  --bone:#F4F1E6;
  --bone-raised:#FBF9F1;
  --rock:#6E7278;
  --clay:#B25A38;
  --signal:#FF6A1F;
  --electric:#2F6DF6;
  --spring:#4E9A4B;
  --summer:#FF8A3D;
  --autumn:#C98A24;
  --winter:#5FB7DC;
  --moss:#7C9A4E;

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

  --radius-s:12px;
  --radius-m:16px;
  --radius-l:22px;

  --shell:1280px;
  --edge:clamp(18px,4vw,56px);
  --header-h:74px;
  --ease:cubic-bezier(.2,.7,.2,1);
  --line:rgba(20,22,26,.12);
  --line-light:rgba(244,241,230,.16);
  --shadow-1:0 18px 40px rgba(20,22,26,.10);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bone);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5{margin:0;font-weight:800;letter-spacing:-.02em;line-height:1.2}
p{margin:0 0 1.05em;max-width:72ch}
p:last-child{margin-bottom:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:var(--electric);text-underline-offset:3px}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit}
strong,b{font-weight:800}
table{border-collapse:collapse;width:100%}
.num,.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}

/* ---------- 无障碍 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  padding:12px 18px;border-radius:10px;
  background:var(--bone);color:var(--ink-deep);
  font-weight:700;text-decoration:none;box-shadow:var(--shadow-1);
  transform:translateY(-190%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}
.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;
}
:focus-visible{outline:2px solid var(--electric);outline-offset:3px;border-radius:6px}
.site-header :focus-visible,
.site-footer :focus-visible,
.card--panel :focus-visible{outline-color:var(--winter)}
[id]{scroll-margin-top:96px}

/* ---------- 版式容器 ---------- */
.shell{width:min(100% - (var(--edge) * 2),var(--shell));margin-inline:auto}
.section{padding-block:clamp(52px,7.5vw,104px)}
.section--tight{padding-block:clamp(30px,4.5vw,60px)}

.grid{display:grid;gap:clamp(18px,2.6vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4-8{grid-template-columns:4fr 8fr}
.grid--8-4{grid-template-columns:8fr 4fr}
.grid--5-7{grid-template-columns:5fr 7fr}
.grid--7-5{grid-template-columns:7fr 5fr}
@media (max-width:980px){
  .grid--2,.grid--3,.grid--4-8,.grid--8-4,.grid--5-7,.grid--7-5{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 标题组 ---------- */
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;
  color:var(--clay);margin-bottom:10px;
}
.section-head{
  display:flex;align-items:flex-start;gap:clamp(12px,2vw,22px);
  margin-bottom:clamp(22px,3vw,38px);
}
.section-head__note{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.28em;
  color:var(--rock);white-space:nowrap;padding-top:6px;
}
.section-title{font-size:clamp(28px,4vw,44px)}
.section-title--xl{font-size:clamp(38px,6.4vw,78px);letter-spacing:-.03em}
.lede{font-size:18px;line-height:1.9;color:#33383D;max-width:64ch}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 22px;border-radius:999px;border:1px solid transparent;
  font-size:15px;font-weight:700;line-height:1.2;text-decoration:none;
  cursor:pointer;white-space:nowrap;
  transition:transform .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--signal{background:var(--signal);color:var(--ink)}
.btn--signal:hover{background:#FF8147}
.btn--ghost{background:transparent;color:var(--bone);border-color:rgba(244,241,230,.42)}
.btn--ghost:hover{background:rgba(244,241,230,.12);border-color:var(--bone)}
.btn--outline{background:transparent;color:var(--ink-deep);border-color:rgba(18,53,46,.35)}
.btn--outline:hover{background:var(--ink-deep);color:var(--bone);border-color:var(--ink-deep)}
.btn--sm{padding:9px 16px;font-size:13px}
.btn--lg{padding:16px 28px;font-size:17px}

/* ---------- 头部 ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:60;
  color:var(--bone);
  background-color:transparent;
  background-image:linear-gradient(180deg,rgba(18,53,46,.94) 0%,rgba(18,53,46,.62) 58%,rgba(18,53,46,0) 100%);
  border-bottom:1px solid transparent;
  transition:background-color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.site-header[data-scrolled="true"],
.site-header[data-pinned="true"]{
  background-color:var(--ink-deep);
  background-image:none;
  border-bottom-color:var(--line-light);
  box-shadow:0 12px 32px rgba(20,22,26,.30);
}
.site-header__inner{
  display:flex;align-items:center;gap:clamp(12px,2vw,26px);
  min-height:var(--header-h);padding-block:10px;
}
.scroll-progress{
  position:absolute;left:0;top:0;height:3px;width:0;z-index:2;
  background:linear-gradient(90deg,var(--spring),var(--summer),var(--autumn),var(--winter));
  transition:width .12s linear;
}

.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;color:var(--bone)}
.brand__mark{
  width:38px;height:38px;flex:0 0 38px;border-radius:12px;
  display:grid;place-items:center;
  background:var(--signal);color:var(--ink);
  font-size:18px;font-weight:900;letter-spacing:-.04em;
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__name{font-size:17px;font-weight:800;letter-spacing:.02em;color:var(--bone)}
.brand__subline{font-size:11px;letter-spacing:.16em;color:rgba(244,241,230,.64)}

.nav{display:flex;align-items:center;gap:20px;margin-left:auto}
.nav__list{display:flex;align-items:center;gap:clamp(10px,1.6vw,20px)}
.nav__item{position:relative}
.nav__link{
  position:relative;display:inline-block;padding:8px 2px;
  color:rgba(244,241,230,.86);font-size:15px;text-decoration:none;
  transition:color .18s var(--ease);
}
.nav__link::after{
  content:"";position:absolute;left:0;right:100%;bottom:2px;height:2px;
  background:var(--signal);transition:right .24s var(--ease);
}
.nav__link:hover{color:var(--bone)}
.nav__link:hover::after,
.nav__link:focus-visible::after,
.nav__link[aria-current="page"]::after{right:0}
.nav__link[aria-current="page"]{color:var(--bone)}

.nav__meta{
  display:flex;align-items:center;gap:10px;
  padding-left:16px;border-left:1px solid var(--line-light);
}
.nav__season{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:rgba(244,241,230,.72);white-space:nowrap;
}
.season-bars{display:inline-flex;align-items:flex-end;gap:3px;height:18px;opacity:.45;transition:opacity .2s var(--ease)}
.site-header[data-scrolled="true"] .season-bars,
.site-header[data-pinned="true"] .season-bars{opacity:1}
.season-bars__bar{width:4px;height:100%;border-radius:2px}
.season-bars__bar--spring{background:var(--spring)}
.season-bars__bar--summer{background:var(--summer)}
.season-bars__bar--autumn{background:var(--autumn)}
.season-bars__bar--winter{background:var(--winter)}

.site-header__cta{margin-left:6px}

.nav-toggle{
  display:none;align-items:center;gap:9px;margin-left:auto;
  padding:9px 15px 9px 13px;border-radius:999px;
  background:rgba(244,241,230,.08);border:1px solid rgba(244,241,230,.26);
  color:var(--bone);font-size:13px;font-weight:700;
  cursor:pointer;transition:background-color .18s var(--ease);
}
.nav-toggle:hover{background:rgba(244,241,230,.16)}
.nav-toggle__bars{display:grid;gap:3px}
.nav-toggle__bars span{
  display:block;width:16px;height:2px;border-radius:2px;background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__label{letter-spacing:.1em}

@media (max-width:1120px){
  .nav__meta{display:none}
}
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .site-header__cta{display:none}
  .nav{
    position:fixed;inset:auto 0 0 0;z-index:90;
    flex-direction:column;align-items:stretch;gap:0;margin:0;
    max-height:84vh;overflow-y:auto;
    padding:10px 22px calc(24px + env(safe-area-inset-bottom,0px));
    background:var(--ink-deep);
    border-radius:var(--radius-l) var(--radius-l) 0 0;
    box-shadow:0 -18px 50px rgba(20,22,26,.5);
    transform:translateY(102%);visibility:hidden;
    transition:transform .28s var(--ease),visibility .28s var(--ease);
  }
  .nav[data-open="true"]{transform:translateY(0);visibility:visible}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__link{
    display:block;padding:13px 4px;font-size:17px;
    border-bottom:1px solid rgba(244,241,230,.1);
  }
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{color:var(--signal)}
  .nav__item[data-seg]::before{
    content:attr(data-seg);display:block;
    padding:16px 4px 6px;
    font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;
    color:var(--winter);
    border-top:1px solid var(--line-light);
  }
  .nav__item:first-child[data-seg]::before{border-top:0;padding-top:6px}
  .nav__meta{
    display:flex;justify-content:space-between;
    padding:16px 4px 0;margin-top:12px;
    border-left:0;border-top:1px solid var(--line-light);
  }
  body.nav-open{overflow:hidden}
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,96px);
  background:var(--ink);
  color:rgba(244,241,230,.78);
}
.season-strip{display:grid;grid-template-columns:repeat(4,1fr);height:6px}
.season-strip__unit{display:block}
.season-strip__unit--spring{background:var(--spring)}
.season-strip__unit--summer{background:var(--summer)}
.season-strip__unit--autumn{background:var(--autumn)}
.season-strip__unit--winter{background:var(--winter)}

.site-footer__inner{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;
  gap:clamp(24px,4vw,56px);
  padding-block:clamp(40px,6vw,74px);
}
.footer__brandline{
  font-size:clamp(20px,2.4vw,26px);font-weight:800;line-height:1.35;
  color:var(--bone);letter-spacing:-.01em;margin-bottom:12px;max-width:22ch;
}
.footer__note{
  font-size:14px;line-height:1.8;color:rgba(244,241,230,.6);
  margin-bottom:20px;max-width:30ch;
}
.footer__title{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;
  color:var(--winter);margin:0 0 16px;
}
.footer__list{display:grid;gap:10px}
.footer__link{
  color:rgba(244,241,230,.82);font-size:15px;text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer__link:hover{color:var(--bone);border-bottom-color:var(--signal)}
.footer__lines{display:grid;gap:10px;font-size:14px;line-height:1.7;color:rgba(244,241,230,.66)}
.footer__line{word-break:break-word}
.footer__bottom{
  display:flex;flex-wrap:wrap;gap:10px 24px;align-items:center;justify-content:space-between;
  padding-block:20px 30px;
  border-top:1px solid rgba(244,241,230,.12);
  font-size:13px;color:rgba(244,241,230,.52);
}
.footer__bottom p{margin:0;max-width:none}
.footer__legal{font-family:var(--font-mono);letter-spacing:.04em}
@media (max-width:980px){
  .site-footer__inner{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:620px){
  .site-footer__inner{grid-template-columns:minmax(0,1fr);gap:32px}
}

/* ---------- 卡片与面板 ---------- */
.card{
  position:relative;
  background:var(--bone-raised);
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  padding:clamp(18px,2.2vw,28px);
}
.card--panel{
  background-color:var(--ink-deep);
  background-image:repeating-linear-gradient(0deg,rgba(244,241,230,.07) 0 1px,transparent 1px 26px);
  border-color:transparent;
  color:rgba(244,241,230,.86);
}
.card--panel .card__title{color:var(--bone)}
.card--note{
  background:var(--clay);border-color:transparent;color:#FFF5EC;
}
.card--note .card__title{color:#FFF5EC}
.card--spring{border-left:4px solid var(--spring)}
.card--summer{border-left:4px solid var(--summer)}
.card--autumn{border-left:4px solid var(--autumn)}
.card--winter{border-left:4px solid var(--winter)}
.card__title{font-size:clamp(18px,2vw,22px);font-weight:800;margin-bottom:8px}
.card__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--rock)}
.card--panel .card__meta,.card--note .card__meta{color:rgba(244,241,230,.6)}
.card__body{font-size:16px;line-height:1.8}

.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 11px;border-radius:999px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  background:rgba(20,22,26,.06);color:var(--ink);
}
.chip--spring{background:rgba(78,154,75,.16);color:#2C5C2E}
.chip--summer{background:rgba(255,138,61,.2);color:#8A3F0F}
.chip--autumn{background:rgba(201,138,36,.2);color:#7A5210}
.chip--winter{background:rgba(95,183,220,.22);color:#1F5E7A}
.chip--signal{background:rgba(255,106,31,.18);color:#A63E0C}

/* ---------- 状态面板 ---------- */
.status-panel{
  display:flex;flex-wrap:wrap;gap:8px 22px;align-items:center;
  padding:14px 20px;border-radius:var(--radius-m);
  background:var(--ink-deep);
  background-image:repeating-linear-gradient(90deg,rgba(244,241,230,.06) 0 1px,transparent 1px 40px);
  color:var(--bone);font-size:13px;
}
.status-panel__item{display:inline-flex;align-items:center;gap:8px}
.status-panel__dot{width:8px;height:8px;border-radius:50%;background:var(--spring);flex:0 0 8px}
.status-panel__dot--signal{background:var(--signal)}
.status-panel__dot--winter{background:var(--winter)}
.status-panel__key{color:rgba(244,241,230,.58);letter-spacing:.08em;font-size:12px}
.status-panel__value{font-family:var(--font-mono);font-size:14px;font-variant-numeric:tabular-nums}

/* ---------- 数字锚点 ---------- */
.score{
  font-family:var(--font-mono);font-weight:700;line-height:.9;
  font-size:clamp(72px,12vw,160px);letter-spacing:-.04em;
}
.round-mark{
  font-family:var(--font-mono);font-weight:700;line-height:.85;
  font-size:clamp(48px,8vw,110px);letter-spacing:-.03em;color:var(--ink-deep);
}

/* ---------- 媒体容器（页面阶段放图片） ---------- */
.media{
  position:relative;overflow:hidden;
  border-radius:var(--radius-m);
  aspect-ratio:16 / 10;
  background:linear-gradient(155deg,#153B33 0%,var(--ink) 100%);
}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:3 / 4}
.media--square{aspect-ratio:1 / 1}
.media > img{width:100%;height:100%;object-fit:cover}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:14px 16px;
  background:linear-gradient(0deg,rgba(20,22,26,.9),rgba(20,22,26,0));
  color:var(--bone);font-size:13px;line-height:1.6;
}
.media__tag{
  position:absolute;left:14px;top:14px;
  padding:5px 10px;border-radius:999px;
  background:rgba(244,241,230,.92);color:var(--ink);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  margin:0 0 22px;font-size:13px;color:var(--rock);
}
.breadcrumbs a{color:var(--rock);text-decoration:none;border-bottom:1px solid rgba(110,114,120,.42)}
.breadcrumbs a:hover{color:var(--electric);border-bottom-color:currentColor}
.breadcrumbs__sep{color:rgba(110,114,120,.6)}
.breadcrumbs li{display:inline-flex;align-items:center;gap:8px}

/* ---------- 滚动显现 ---------- */
.reveal{transition:opacity .42s var(--ease),transform .42s var(--ease);transition-delay:var(--d,0ms)}
.js .reveal{opacity:0;transform:translateY(16px)}
.js .reveal.is-visible{opacity:1;transform:none}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;right:clamp(14px,2vw,26px);bottom:clamp(14px,2vw,26px);z-index:75;
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 17px;border-radius:999px;cursor:pointer;
  background:var(--ink-deep);color:var(--bone);
  border:1px solid rgba(244,241,230,.26);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s var(--ease);
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:#1B4A40}
body.nav-open .to-top{opacity:0;visibility:hidden}

/* ---------- 动效降级 ---------- */
@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;
  }
  .js .reveal{opacity:1;transform:none}
  .scroll-progress{transition:none}
}