/* ============================================================
   四季体育主站 · 共享样式 /assets/site.css
   深夜底 + 四季荧光色 + 框景刻度 + 悬浮胶囊导航
   ============================================================ */

:root{
  --sj-ink:#05070C;
  --sj-surface:#0E1A26;
  --sj-zone-nav:#0F2E2C;
  --sj-zone-member:#2A0F1C;
  --sj-zone-press:#1B1233;

  --sj-spring:#C8F04A;
  --sj-spring-2:#FF6FA5;
  --sj-summer:#35D6FF;
  --sj-summer-2:#FF7A29;
  --sj-autumn:#FFC24D;
  --sj-autumn-2:#E4402F;
  --sj-winter:#A8ECFF;
  --sj-winter-2:#F3F7FA;

  --sj-text:#F3F7FA;
  --sj-muted:#93A6B4;
  --sj-line:rgba(147,166,180,.26);
  --sj-line-strong:rgba(147,166,180,.44);

  --sj-font-display:"Noto Sans SC","Source Han Sans SC",system-ui,"Microsoft YaHei",sans-serif;
  --sj-font-body:"Noto Sans SC",system-ui,"Microsoft YaHei",sans-serif;
  --sj-font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --sj-radius:14px;
  --sj-radius-sm:10px;
  --sj-pill:999px;
  --sj-shadow:0 12px 34px rgba(0,0,0,.5);
  --sj-shadow-soft:0 2px 10px rgba(0,0,0,.35);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--sj-ink);
  color:var(--sj-text);
  font-family:var(--sj-font-body);
  font-size:17px;
  line-height:1.6;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg,video{max-width:100%;display:block}
button,input{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
p{margin:0 0 1em}
a{color:var(--sj-summer);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--sj-summer);outline-offset:3px;border-radius:4px}
::selection{background:var(--sj-spring);color:var(--sj-ink)}

/* ---------- 中文排版 ---------- */
h1,h2,h3,h4,h5{
  font-family:var(--sj-font-display);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.1;
  margin:0 0 .55em;
  color:var(--sj-text);
  text-wrap:balance;
}
h1{font-size:clamp(40px,4.4vw,72px)}
h2{font-size:clamp(28px,3.2vw,56px)}
h3{font-size:clamp(22px,2vw,28px)}
h4{font-size:20px}
.sj-title-xl{font-size:clamp(40px,4.4vw,72px)}
.sj-title-lg{font-size:clamp(30px,3.2vw,56px)}
.sj-title-md{font-size:clamp(22px,2.2vw,40px)}
.sj-lede{font-size:17px;line-height:1.65;color:var(--sj-muted);max-width:62ch}
.sj-mono{font-family:var(--sj-font-mono);font-variant-numeric:tabular-nums;letter-spacing:.01em}

/* ---------- 骨架 ---------- */
.sj-container{width:100%;max-width:1680px;margin:0 auto;padding:0 clamp(16px,3vw,56px)}
.sj-container--narrow{max-width:1000px}
.sj-main{display:block;padding-top:clamp(92px,11vh,132px);padding-bottom:clamp(40px,6vh,80px)}
.sj-section{margin:0 0 clamp(40px,6vh,88px)}
.sj-section__head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:clamp(18px,2.4vh,32px)}
.sj-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--sj-font-mono);font-size:13px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--sj-muted);margin:0 0 10px;
}
.sj-eyebrow::before{content:"";width:18px;height:1px;background:var(--sj-autumn)}
.sj-rule{height:1px;background:var(--sj-line);border:0;margin:clamp(24px,4vh,48px) 0}

/* ---------- skip link ---------- */
.sj-skip{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--sj-spring);color:var(--sj-ink);
  padding:12px 20px;border-radius:0 0 var(--sj-radius-sm) 0;
  font-weight:700;font-size:15px;
}
.sj-skip:focus{left:0;text-decoration:none}

/* ============================================================
   头部 · 悬浮胶囊导航
   ============================================================ */
.sj-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  display:flex;justify-content:flex-end;
  padding:16px clamp(16px,4vw,64px) 0;
  pointer-events:none;
}
.sj-capsule{
  position:relative;
  pointer-events:auto;
  display:flex;align-items:center;
  gap:clamp(8px,1.4vw,22px);
  padding:9px 14px 9px 20px;
  max-width:100%;
  background:rgba(14,26,38,.88);
  border:1px solid var(--sj-line);
  border-radius:var(--sj-pill);
  box-shadow:var(--sj-shadow),inset 0 0 0 1px rgba(5,7,12,.55);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  transition:padding .24s ease,gap .24s ease;
}
.sj-header[data-collapsed="true"] .sj-capsule{padding:5px 10px 5px 16px;gap:clamp(6px,1vw,14px)}
.sj-header[data-collapsed="true"] .sj-brand__suffix{display:none}
.sj-header[data-collapsed="true"] .sj-nav__link{padding:6px 10px;font-size:14px}

.sj-brand{display:flex;align-items:baseline;gap:8px;text-decoration:none;color:var(--sj-text);padding-right:14px;border-right:1px solid var(--sj-line)}
.sj-brand:hover{text-decoration:none}
.sj-brand__mark{font-family:var(--sj-font-display);font-weight:900;font-size:19px;letter-spacing:-.01em;white-space:nowrap}
.sj-brand__suffix{font-size:12px;letter-spacing:.18em;color:var(--sj-spring);white-space:nowrap}

.sj-nav{display:block}
.sj-nav__list{display:flex;align-items:center;gap:2px}
.sj-nav__item{display:block}
.sj-nav__link{
  display:inline-flex;align-items:center;gap:7px;
  padding:8px 12px;border-radius:var(--sj-pill);
  font-size:15px;color:var(--sj-muted);white-space:nowrap;
  transition:color .18s ease,background-color .18s ease;
}
.sj-nav__link:hover{color:var(--sj-text);background:rgba(243,247,250,.06);text-decoration:none}
.sj-nav__link[aria-current="page"]{color:var(--sj-text);background:rgba(243,247,250,.09);font-weight:500}
.sj-nav__dot{width:7px;height:7px;border-radius:50%;flex:none;background:var(--sj-muted);transition:box-shadow .2s ease,transform .2s ease}
.sj-nav__link[aria-current="page"] .sj-nav__dot{transform:scale(1.2);box-shadow:0 0 0 4px rgba(243,247,250,.1)}
.sj-nav__link:hover .sj-nav__dot{transform:scale(1.15)}
.sj-dot--spring{background:var(--sj-spring)}
.sj-dot--summer{background:var(--sj-summer)}
.sj-dot--autumn{background:var(--sj-autumn)}
.sj-dot--winter{background:var(--sj-winter)}

.sj-search{position:relative}
.sj-search__toggle{
  display:inline-flex;align-items:center;gap:6px;
  background:transparent;border:1px solid var(--sj-line);
  border-radius:var(--sj-pill);padding:7px 14px;
  font-size:14px;color:var(--sj-muted);cursor:pointer;
  transition:border-color .18s ease,color .18s ease;
}
.sj-search__toggle:hover{border-color:var(--sj-summer);color:var(--sj-summer)}
.sj-search__toggle[aria-expanded="true"]{border-color:var(--sj-summer);color:var(--sj-summer)}
.sj-search__field{
  position:absolute;top:calc(100% + 12px);right:0;z-index:5;
  min-width:300px;padding:10px;
  background:var(--sj-surface);
  border:1px solid var(--sj-summer);
  border-radius:var(--sj-radius);
  box-shadow:var(--sj-shadow);
}
.sj-search__field[hidden]{display:none}
.sj-search__input{
  width:100%;padding:10px 12px;
  background:var(--sj-ink);
  border:1px solid var(--sj-line);
  border-radius:var(--sj-radius-sm);
  color:var(--sj-text);font-size:15px;line-height:1.4;
}
.sj-search__input::placeholder{color:var(--sj-muted)}
.sj-search__input:focus{outline:none;border-color:var(--sj-summer);box-shadow:0 0 0 3px rgba(53,214,255,.18)}

.sj-header__return{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 16px;border-radius:var(--sj-pill);
  background:var(--sj-autumn);color:var(--sj-ink);
  font-size:14px;font-weight:700;white-space:nowrap;
  box-shadow:0 6px 20px rgba(255,194,77,.2);
  transition:transform .18s ease,box-shadow .18s ease;
}
.sj-header__return::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--sj-ink)}
.sj-header__return:hover{text-decoration:none;transform:translateY(-1px);box-shadow:0 8px 24px rgba(255,194,77,.32)}

.sj-burger{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:42px;height:42px;padding:0 10px;
  background:transparent;border:1px solid var(--sj-line);
  border-radius:var(--sj-pill);cursor:pointer;
}
.sj-burger__bar{display:block;width:100%;height:1.5px;background:var(--sj-text);border-radius:2px;transition:transform .2s ease,opacity .2s ease}
.sj-header[data-open="true"] .sj-burger__bar:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.sj-header[data-open="true"] .sj-burger__bar:nth-child(2){opacity:0}
.sj-header[data-open="true"] .sj-burger__bar:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

.sj-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  border-radius:0 0 var(--sj-pill) var(--sj-pill);
  overflow:hidden;background:rgba(147,166,180,.14);
}
.sj-progress__fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--sj-spring),var(--sj-spring-2),var(--sj-summer),var(--sj-summer-2),var(--sj-autumn),var(--sj-winter));
  transition:width .12s linear;
}

/* ============================================================
   页脚
   ============================================================ */
.sj-footer{
  position:relative;
  margin-top:clamp(48px,8vh,120px);
  background:var(--sj-surface);
  border-top:1px solid var(--sj-line);
}
.sj-footer__inner{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.7fr);
  gap:clamp(24px,3vw,64px);
  padding-top:clamp(32px,5vh,64px);
  padding-bottom:clamp(24px,4vh,40px);
}
.sj-footer__brand{max-width:44ch}
.sj-footer__mark{
  font-family:var(--sj-font-display);font-weight:900;
  font-size:clamp(22px,2vw,28px);letter-spacing:-.02em;line-height:1.2;
  margin:0 0 12px;display:flex;flex-wrap:wrap;align-items:baseline;gap:10px;
}
.sj-footer__mark-suffix{font-family:var(--sj-font-body);font-size:12px;font-weight:500;letter-spacing:.2em;color:var(--sj-spring)}
.sj-footer__note{font-size:15px;line-height:1.65;color:var(--sj-muted);margin:0 0 18px}
.sj-footer__cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px 28px}
.sj-footer__col-title{
  font-family:var(--sj-font-mono);font-size:13px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;
  color:var(--sj-muted);margin:0 0 14px;
}
.sj-footer__list{display:flex;flex-direction:column;gap:10px}
.sj-footer__link{font-size:15px;color:var(--sj-text);opacity:.82}
.sj-footer__link:hover{opacity:1;color:var(--sj-summer);text-decoration:none}

.sj-footer__contact{
  grid-column:1 / -1;
  display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:12px 32px;
  padding-top:clamp(18px,3vh,28px);
  border-top:1px solid var(--sj-line);
}
.sj-contact-item{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0;font-size:15px;color:var(--sj-text)}
.sj-contact-item__label{
  font-size:13px;letter-spacing:.08em;color:var(--sj-muted);
  padding-right:8px;border-right:1px solid var(--sj-line);
}
.sj-copy{
  background:transparent;border:1px solid var(--sj-line);
  border-radius:var(--sj-pill);padding:3px 12px;
  font-size:13px;color:var(--sj-muted);cursor:pointer;
  transition:border-color .18s ease,color .18s ease;
}
.sj-copy:hover{border-color:var(--sj-spring);color:var(--sj-spring)}
.sj-copy[data-copied="true"]{border-color:var(--sj-spring);color:var(--sj-spring)}

.sj-footer__meta{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 24px;
  padding-top:16px;padding-bottom:22px;
  border-top:1px solid var(--sj-line);
  font-size:13px;color:var(--sj-muted);
}
.sj-footer__meta p{margin:0}
.sj-footer__band{
  display:block;position:absolute;left:0;right:0;bottom:0;height:4px;
  background:linear-gradient(90deg,var(--sj-spring),var(--sj-spring-2),var(--sj-summer),var(--sj-summer-2),var(--sj-autumn),var(--sj-autumn-2),var(--sj-winter));
  animation:sj-hue 12s linear infinite;
}
.sj-footer__band:hover{animation-play-state:paused}
@keyframes sj-hue{from{filter:hue-rotate(0deg)}to{filter:hue-rotate(360deg)}}

/* ============================================================
   通用组件
   ============================================================ */
.sj-grid{display:grid;gap:clamp(14px,1.6vw,24px)}
.sj-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.sj-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.sj-grid--bento{grid-template-columns:repeat(12,minmax(0,1fr))}

.sj-card{
  position:relative;
  padding:clamp(16px,1.6vw,26px);
  background:linear-gradient(180deg,rgba(14,26,38,.94),rgba(14,26,38,.72));
  border:1px solid var(--sj-line);
  border-radius:var(--sj-radius);
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.sj-card:hover{transform:translateY(-2px);border-color:var(--sj-summer);box-shadow:var(--sj-shadow-soft)}
.sj-card__label{
  display:block;font-family:var(--sj-font-mono);font-size:13px;
  letter-spacing:.14em;color:var(--sj-muted);margin-bottom:10px;
}
.sj-card__title{font-size:20px;font-weight:900;letter-spacing:-.01em;margin:0 0 8px}
.sj-card__meta{display:flex;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--sj-muted);margin:0}

.sj-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border-radius:var(--sj-pill);
  font-size:13px;font-weight:500;line-height:1.5;
  border:1px solid currentColor;background:transparent;
}
.sj-tag--spring{color:var(--sj-spring)}
.sj-tag--summer{color:var(--sj-summer)}
.sj-tag--autumn{color:var(--sj-autumn)}
.sj-tag--winter{color:var(--sj-winter)}

.sj-stat{display:flex;flex-direction:column;gap:4px}
.sj-stat__num{font-family:var(--sj-font-mono);font-size:clamp(28px,3vw,40px);line-height:1;color:var(--sj-spring)}
.sj-stat__label{font-size:13px;letter-spacing:.08em;color:var(--sj-muted)}

.sj-btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 24px;border-radius:var(--sj-pill);
  border:1px solid transparent;cursor:pointer;
  font-family:var(--sj-font-body);font-size:15px;font-weight:600;line-height:1;
  transition:transform .18s ease,background-color .18s ease,border-color .18s ease,color .18s ease;
}
.sj-btn:hover{text-decoration:none;transform:translateY(-1px)}
.sj-btn--primary{background:var(--sj-spring);color:var(--sj-ink);box-shadow:0 8px 24px rgba(200,240,74,.18)}
.sj-btn--primary:hover{background:#d6f76b}
.sj-btn--ghost{background:transparent;color:var(--sj-text);border-color:var(--sj-line-strong)}
.sj-btn--ghost:hover{border-color:var(--sj-spring);color:var(--sj-spring)}

.sj-breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  margin:0 0 20px;font-size:13px;color:var(--sj-muted);
}
.sj-breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.sj-breadcrumb li+li::before{content:"/";color:rgba(147,166,180,.5)}
.sj-breadcrumb a{color:var(--sj-muted)}
.sj-breadcrumb a:hover{color:var(--sj-summer);text-decoration:none}
.sj-breadcrumb [aria-current="page"]{color:var(--sj-text)}

/* ---------- 框景与刻度 ---------- */
.sj-frame{position:relative;border:1px solid var(--sj-line);border-radius:var(--sj-radius)}
.sj-frame::before,.sj-frame::after{
  content:"";position:absolute;width:16px;height:16px;pointer-events:none;
}
.sj-frame::before{top:-1px;left:-1px;border-top:1px solid var(--sj-autumn);border-left:1px solid var(--sj-autumn)}
.sj-frame::after{bottom:-1px;right:-1px;border-bottom:1px solid var(--sj-summer);border-right:1px solid var(--sj-summer)}

/* ---------- 图片容器基础规则 ---------- */
.sj-figure{
  position:relative;margin:0;overflow:hidden;
  border:1px solid var(--sj-line);border-radius:var(--sj-radius);
  background:var(--sj-zone-press);
  aspect-ratio:16 / 9;
}
.sj-figure--wide{aspect-ratio:21 / 9}
.sj-figure--tall{aspect-ratio:4 / 5}
.sj-figure__media{width:100%;height:100%;object-fit:cover;display:block}
.sj-figure__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:28px 14px 10px;
  font-family:var(--sj-font-mono);font-size:13px;color:var(--sj-text);
  background:linear-gradient(180deg,rgba(5,7,12,0),rgba(5,7,12,.85));
}

/* ---------- 滚动显现 ---------- */
.sj-reveal{opacity:0;transform:translateY(8px);transition:opacity .24s ease,transform .24s ease}
.sj-reveal[data-visible="true"]{opacity:1;transform:none}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1200px){
  .sj-nav__link{padding:7px 9px;font-size:14px}
  .sj-brand__suffix{display:none}
  .sj-grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .sj-footer__inner{grid-template-columns:minmax(0,1fr)}
  .sj-footer__brand{max-width:none}
}

@media (max-width:900px){
  body{font-size:16px}
  .sj-header{padding:10px 14px 0;justify-content:center}
  .sj-capsule{width:100%;justify-content:space-between;gap:8px;padding:8px 10px 8px 14px;border-radius:20px}
  .sj-header[data-collapsed="true"] .sj-capsule{padding:8px 10px 8px 14px;gap:8px}
  .sj-brand{border-right:0;padding-right:0}
  .sj-burger{display:flex}
  .sj-nav{
    display:none;
    position:absolute;top:calc(100% + 10px);left:0;right:0;z-index:6;
    padding:12px;
    background:var(--sj-surface);
    border:1px solid var(--sj-line);
    border-radius:20px;
    box-shadow:var(--sj-shadow);
  }
  .sj-header[data-open="true"] .sj-nav{display:block}
  .sj-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .sj-nav__link{width:100%;padding:12px 14px;font-size:16px;border-radius:12px}
  .sj-header[data-collapsed="true"] .sj-nav__link{font-size:16px;padding:12px 14px}
  .sj-nav__link[aria-current="page"]{background:rgba(243,247,250,.08)}
  .sj-search__field{min-width:0;left:0;right:0}
  .sj-header__return{padding:7px 12px;font-size:13px}
  .sj-search__toggle{padding:7px 11px;font-size:13px}
  .sj-grid--2,.sj-grid--3,.sj-grid--bento{grid-template-columns:minmax(0,1fr)}
  .sj-footer__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .sj-footer__meta{flex-direction:column;gap:6px}
}

@media (max-width:560px){
  .sj-container{padding:0 16px}
  .sj-brand__mark{font-size:17px}
  .sj-header__return::before{display:none}
  .sj-search__toggle{font-size:0;padding:9px;width:36px;height:36px;justify-content:center}
  .sj-search__toggle::before{content:"⌕";font-size:16px;line-height:1}
  .sj-footer__cols{grid-template-columns:minmax(0,1fr)}
  .sj-card{padding:16px}
  .sj-figure__caption{font-size:12px}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .sj-reveal{opacity:1;transform:none}
  .sj-footer__band{animation:none}
  .sj-progress__fill{transition:none}
}