/* ==========================================================================
   小鸟体育 · 共享样式表 /assets/site.css
   母题：草原绿 × 天空蓝 × 鸟羽亮橙；羽毛弧线分割；编辑部非对称节奏
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --deep:#0B2A22;
  --deep-ink:#08201A;
  --grass:#167A55;
  --grass-deep:#0F6546;
  --grass-soft:#DFF0E6;
  --sky:#2F80C9;
  --sky-deep:#2569A6;
  --sky-soft:#E7F1FA;
  --flame:#E8551F;
  --lime:#9BD34A;
  --silver:#B9C4C9;
  --paper:#FBF8F2;
  --ink:#0C1B2A;
  --ink-soft:#3D4C59;
  --ink-mute:#6B7A86;

  --line:rgba(12,27,42,.10);
  --line-strong:rgba(12,27,42,.20);
  --glass:rgba(255,255,255,.66);
  --glass-line:rgba(255,255,255,.72);

  --r-xl:28px;
  --r-lg:20px;
  --r-md:14px;
  --r-sm:10px;
  --r-pill:999px;

  --shadow-soft:0 20px 50px rgba(11,42,34,.10);
  --shadow-card:0 10px 26px rgba(11,42,34,.07);
  --shadow-lift:0 26px 60px rgba(11,42,34,.16);

  --font-sans:"HarmonyOS Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,"Courier New",monospace;

  --wrap:1200px;
  --gutter:clamp(16px,4vw,44px);
  --ease:cubic-bezier(.22,.68,.32,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:118px;
}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:clamp(15px,1.05vw,16.5px);
  line-height:1.85;
  color:var(--ink);
  letter-spacing:.01em;
  background-color:var(--paper);
  background-image:
    radial-gradient(920px 430px at 92% -6%, rgba(47,128,201,.14), transparent 68%),
    radial-gradient(780px 400px at -8% 2%, rgba(22,122,85,.12), transparent 66%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;border-spacing:0}
hr{border:0;border-top:1px solid var(--line);margin:0}

:focus-visible{
  outline:3px solid var(--flame);
  outline-offset:3px;
  border-radius:6px;
}

/* ---------- 3. 中文排版基调 ---------- */
h1,h2,h3,h4{font-weight:800;line-height:1.26;letter-spacing:-.01em;color:var(--ink)}
h1{font-size:clamp(2rem,4vw,3.25rem)}
h2{font-size:clamp(1.55rem,2.6vw,2.25rem)}
h3{font-size:clamp(1.18rem,2vw,1.5rem)}
h4{font-size:clamp(1rem,1.4vw,1.15rem)}
strong,b{font-weight:700}

/* ---------- 4. 通用容器 ---------- */
.wrap{
  width:min(var(--wrap),100% - 2*var(--gutter));
  margin-inline:auto;
}
.section{padding-block:clamp(40px,6vw,76px)}
.section--tight{padding-block:clamp(24px,4vw,44px)}
.stack > * + *{margin-top:var(--stack-gap,18px)}

/* ---------- 5. 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:-72px;
  left:clamp(12px,3vw,30px);
  z-index:300;
  padding:12px 22px;
  border-radius:0 0 14px 14px;
  background:var(--deep);
  color:#fff;
  font-weight:700;
  letter-spacing:.04em;
  transition:top .22s var(--ease);
}
.skip-link:focus{top:0}

/* ---------- 6. 页头：悬浮胶囊 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  padding:clamp(10px,1.6vw,18px) 0 0;
}
.header-shell{
  width:min(var(--wrap),100% - 2*var(--gutter));
  margin-inline:auto;
}
.nav-capsule{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.8vw,24px);
  padding:9px 12px 9px 16px;
  border-radius:var(--r-pill);
  background:rgba(251,248,242,.84);
  border:1px solid rgba(12,27,42,.08);
  box-shadow:var(--shadow-soft);
  -webkit-backdrop-filter:blur(16px) saturate(1.25);
  backdrop-filter:blur(16px) saturate(1.25);
  transition:padding .28s var(--ease), box-shadow .28s var(--ease), background .28s var(--ease);
}
.site-header[data-scrolled="true"] .nav-capsule{
  padding:5px 10px 5px 12px;
  background:rgba(251,248,242,.94);
  box-shadow:0 12px 30px rgba(11,42,34,.14);
}

/* 品牌 */
.brand{
  display:flex;
  align-items:center;
  gap:11px;
  flex:0 0 auto;
  padding:4px 6px;
  border-radius:var(--r-pill);
}
.brand-mark{
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  flex:0 0 auto;
  border-radius:50%;
  background:linear-gradient(135deg,var(--grass) 8%,var(--sky) 96%);
  color:#fff;
  box-shadow:0 8px 18px rgba(22,122,85,.32);
}
.brand-mark svg{width:21px;height:21px}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-name{font-size:1.06rem;font-weight:900;letter-spacing:.06em;color:var(--deep)}
.brand-tag{
  max-height:18px;
  overflow:hidden;
  font-family:var(--font-serif);
  font-size:.72rem;
  letter-spacing:.07em;
  color:var(--grass);
  white-space:nowrap;
  transition:max-height .26s var(--ease), opacity .2s var(--ease);
}
.site-header[data-scrolled="true"] .brand-tag{max-height:0;opacity:0}

/* 主导航 */
.primary-nav{
  flex:1 1 auto;
  display:flex;
  align-items:center;
  justify-content:center;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(2px,.5vw,8px);
}
.nav-item{display:block}
.nav-link{
  position:relative;
  display:inline-block;
  padding:9px 14px;
  border-radius:var(--r-pill);
  font-size:.94rem;
  font-weight:600;
  color:var(--ink-soft);
  transition:color .2s var(--ease), background .2s var(--ease);
}
.nav-link:hover{color:var(--deep);background:rgba(22,122,85,.10)}
.nav-link[aria-current="page"]{
  color:var(--deep);
  background:var(--grass-soft);
  font-weight:700;
}
.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:2px;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--flame);
  transform:translateX(-50%);
}
.nav-foot{display:none}
.nav-quiet-link{
  font-size:.9rem;
  font-weight:600;
  color:var(--sky);
  text-align:center;
  padding:4px;
}
.nav-quiet-link:hover{color:var(--sky-deep)}

/* 桌面 CTA */
.header-actions{
  flex:0 0 auto;
  display:flex;
  align-items:center;
  gap:8px;
}
.site-header[data-scrolled="true"] .btn-ghost{padding:8px 14px;font-size:.86rem}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 15px;
  border-radius:var(--r-pill);
  background:var(--deep);
  color:#fff;
  font-size:.88rem;
  font-weight:700;
  letter-spacing:.06em;
  transition:background .2s var(--ease);
}
.nav-toggle:hover{background:var(--grass-deep)}
.nav-toggle-bars{
  position:relative;
  width:18px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  flex:0 0 auto;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .25s var(--ease), top .25s var(--ease);
}
.nav-toggle-bars::before{top:-6px}
.nav-toggle-bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:0;transform:rotate(-45deg)}

/* 滚动进度 */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:3px;
  z-index:130;
  pointer-events:none;
}
.scroll-progress-bar{
  display:block;
  height:100%;
  width:0;
  border-radius:0 var(--r-pill) var(--r-pill) 0;
  background:linear-gradient(90deg,var(--grass),var(--sky) 56%,var(--flame));
  transition:width .12s linear;
}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 21px;
  border-radius:var(--r-pill);
  border:1px solid transparent;
  font-size:.94rem;
  font-weight:700;
  letter-spacing:.02em;
  white-space:nowrap;
  transition:transform .2s var(--ease), background .2s var(--ease),
             color .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.btn-primary{
  background:var(--grass);
  color:#fff;
  box-shadow:0 10px 22px rgba(22,122,85,.28);
}
.btn-primary:hover{background:var(--grass-deep);transform:translateY(-2px)}
.btn-flame{
  background:var(--flame);
  color:#fff;
  box-shadow:0 10px 22px rgba(232,85,31,.28);
}
.btn-flame:hover{background:#cf4615;transform:translateY(-2px)}
.btn-ghost{
  background:rgba(255,255,255,.62);
  color:var(--deep);
  border-color:rgba(11,42,34,.16);
}
.btn-ghost:hover{border-color:var(--grass);color:var(--grass);transform:translateY(-2px)}
.btn-block{width:100%}

/* ---------- 8. 编辑部文字件 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-serif);
  font-size:.82rem;
  font-weight:600;
  letter-spacing:.18em;
  color:var(--grass);
}
.eyebrow::before{
  content:"";
  width:26px;
  height:1px;
  background:currentColor;
  opacity:.7;
}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  margin-bottom:clamp(20px,3vw,34px);
}
.section-head .section-title{margin-top:10px}
.section-title{
  font-size:clamp(1.6rem,3vw,2.4rem);
  font-weight:800;
  letter-spacing:-.012em;
}
.lede{
  max-width:34em;
  font-size:clamp(1rem,1.6vw,1.15rem);
  line-height:1.9;
  color:var(--ink-soft);
}
.prose{
  max-width:38em;
  font-size:1.02rem;
  color:var(--ink-soft);
}
.prose p + p{margin-top:1.1em}
.prose strong{color:var(--ink)}
.prose a{
  color:var(--sky);
  border-bottom:1px solid rgba(47,128,201,.38);
}
.prose a:hover{color:var(--sky-deep);border-bottom-color:var(--sky-deep)}
.rule{height:1px;background:var(--line);border:0;margin:clamp(22px,3vw,34px) 0}

/* 面包屑 */
.breadcrumbs{font-size:.8rem;color:var(--ink-mute);margin-bottom:clamp(14px,2vw,22px)}
.breadcrumbs-list{display:flex;flex-wrap:wrap;align-items:center;gap:9px}
.breadcrumbs-item{display:flex;align-items:center;gap:9px}
.breadcrumbs-item + .breadcrumbs-item::before{content:"/";color:var(--silver)}
.breadcrumbs a:hover{color:var(--grass)}
.breadcrumbs [aria-current="page"]{color:var(--ink);font-weight:600}

/* ---------- 9. 卡片与数据件 ---------- */
.card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:clamp(18px,2.4vw,26px);
  box-shadow:var(--shadow-card);
}
.glass-card{
  background:var(--glass);
  border:1px solid var(--glass-line);
  border-radius:var(--r-xl);
  padding:clamp(18px,2.6vw,30px);
  box-shadow:var(--shadow-soft);
  -webkit-backdrop-filter:blur(14px) saturate(1.2);
  backdrop-filter:blur(14px) saturate(1.2);
}
.deep-panel{
  background:linear-gradient(155deg,var(--deep) 0%,var(--deep-ink) 100%);
  color:rgba(251,248,242,.9);
  border-radius:var(--r-xl);
  padding:clamp(20px,3vw,36px);
}
.deep-panel h2,.deep-panel h3{color:#fff}
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 13px;
  border-radius:var(--r-pill);
  background:var(--sky-soft);
  color:var(--sky-deep);
  font-size:.78rem;
  font-weight:700;
  letter-spacing:.03em;
}
.chip--grass{background:var(--grass-soft);color:var(--grass-deep)}
.chip--flame{background:rgba(232,85,31,.13);color:var(--flame)}
.stat-value{
  display:block;
  font-family:var(--font-mono);
  font-weight:700;
  font-variant-numeric:tabular-nums;
  font-size:clamp(1.5rem,2.6vw,2.1rem);
  letter-spacing:-.02em;
  line-height:1.15;
  color:var(--deep);
}
.stat-label{
  display:block;
  margin-top:4px;
  font-size:.78rem;
  letter-spacing:.08em;
  color:var(--ink-mute);
}

/* ---------- 10. 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.2vw,26px)}
.grid-12{grid-template-columns:repeat(12,minmax(0,1fr))}
.col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:span 12}
@media (min-width:768px){
  .col-3,.col-4,.col-6{grid-column:span 6}
}
@media (min-width:1024px){
  .col-3{grid-column:span 3}
  .col-4{grid-column:span 4}
  .col-5{grid-column:span 5}
  .col-6{grid-column:span 6}
  .col-7{grid-column:span 7}
  .col-8{grid-column:span 8}
  .col-9{grid-column:span 9}
  .col-12{grid-column:span 12}
}

/* ---------- 11. 图片容器（供页面阶段放图） ---------- */
.figure{position:relative;margin:0}
.figure-frame{
  position:relative;
  overflow:hidden;
  border-radius:var(--r-xl);
  border:1px solid rgba(12,27,42,.08);
  background-color:var(--paper);
  background-image:
    linear-gradient(rgba(12,27,42,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(12,27,42,.05) 1px, transparent 1px);
  background-size:34px 34px, 34px 34px;
}
.figure-frame::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(150deg, rgba(47,128,201,.14), rgba(22,122,85,.12) 58%, rgba(232,85,31,.10));
  pointer-events:none;
}
.figure-frame img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure-frame--wide{aspect-ratio:16/9}
.figure-frame--panorama{aspect-ratio:21/9}
.figure-frame--portrait{aspect-ratio:4/5}
.figure-frame--square{aspect-ratio:1/1}
.figure-caption{
  margin-top:9px;
  font-family:var(--font-serif);
  font-size:.8rem;
  color:var(--ink-mute);
  letter-spacing:.02em;
}

/* ---------- 12. 章节目录 ---------- */
.toc{font-size:.86rem}
.toc-list{display:grid;gap:2px}
.toc-link{
  display:flex;
  align-items:center;
  gap:9px;
  padding:7px 10px;
  border-radius:var(--r-sm);
  color:var(--ink-soft);
  transition:background .2s var(--ease), color .2s var(--ease);
}
.toc-link::before{
  content:"";
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--silver);
  flex:0 0 auto;
  transition:background .2s var(--ease), transform .2s var(--ease);
}
.toc-link:hover{color:var(--deep);background:rgba(22,122,85,.08)}
.toc-link.is-active{
  color:var(--deep);
  font-weight:700;
  background:var(--grass-soft);
}
.toc-link.is-active::before{background:var(--flame);transform:scale(1.35)}

/* ---------- 13. 页面动效钩子 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .3s var(--ease), transform .3s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* 返回顶部（由 site.js 注入） */
.to-top{
  position:fixed;
  right:clamp(14px,3vw,30px);
  bottom:clamp(14px,3vw,30px);
  z-index:110;
  width:46px;
  height:46px;
  display:grid;
  place-items:center;
  border-radius:50%;
  background:var(--deep);
  color:#fff;
  border:1px solid rgba(255,255,255,.22);
  box-shadow:0 16px 34px rgba(11,42,34,.32);
  opacity:0;
  transform:translateY(12px);
  pointer-events:none;
  transition:opacity .24s var(--ease), transform .24s var(--ease), background .2s var(--ease);
}
.to-top.is-on{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{background:var(--grass-deep)}

/* ---------- 14. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,104px);
  background:linear-gradient(178deg,var(--deep) 0%,var(--deep-ink) 100%);
  color:rgba(251,248,242,.86);
  padding-bottom:clamp(26px,4vw,44px);
  overflow:hidden;
}
.footer-arc{
  position:relative;
  height:clamp(46px,7vw,84px);
  color:var(--paper);
}
.footer-arc svg{width:100%;height:100%;display:block}
.footer-shell{padding-top:clamp(16px,3vw,32px)}
.footer-grid{
  display:grid;
  gap:clamp(26px,4vw,44px);
  grid-template-columns:1fr;
}
@media (min-width:640px){
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (min-width:1024px){
  .footer-grid{grid-template-columns:1.15fr 1.7fr 1.05fr}
}
.footer-brand .footer-mark{
  display:grid;
  place-items:center;
  width:42px;
  height:42px;
  margin-bottom:14px;
  border-radius:50%;
  background:linear-gradient(135deg,var(--grass) 8%,var(--sky) 96%);
  color:#fff;
}
.footer-mark svg{width:23px;height:23px}
.footer-brand-line{
  font-family:var(--font-serif);
  font-size:1.06rem;
  font-weight:600;
  color:#fff;
  letter-spacing:.02em;
  line-height:1.7;
}
.footer-note{
  margin-top:10px;
  max-width:32em;
  font-size:.82rem;
  line-height:1.8;
  color:rgba(251,248,242,.62);
}
.footer-columns{
  display:grid;
  gap:clamp(18px,3vw,30px);
  grid-template-columns:repeat(3,minmax(0,1fr));
}
.footer-col{display:block}
.footer-col-title{
  position:relative;
  margin-bottom:14px;
  padding-bottom:10px;
  font-size:.95rem;
  font-weight:700;
  color:#fff;
  letter-spacing:.06em;
}
.footer-col-title::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:26px;
  height:2px;
  border-radius:2px;
  background:var(--flame);
}
.footer-col ul{display:grid;gap:10px}
.footer-link{
  font-size:.86rem;
  color:rgba(251,248,242,.7);
  transition:color .2s var(--ease), padding-left .2s var(--ease);
}
.footer-link:hover{color:#fff;padding-left:6px}
.footer-contact{display:block}
.footer-contact-list{display:grid;gap:12px;font-size:.85rem}
.footer-contact-key{
  display:block;
  font-size:.7rem;
  letter-spacing:.16em;
  color:var(--lime);
  margin-bottom:2px;
}
.footer-contact-val{
  display:block;
  color:rgba(251,248,242,.86);
  line-height:1.7;
  word-break:break-word;
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  margin-top:clamp(26px,4vw,42px);
  padding-top:18px;
  border-top:1px solid rgba(251,248,242,.16);
  font-size:.8rem;
  color:rgba(251,248,242,.6);
}
.footer-legal-links{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal-links .footer-link{font-size:.8rem}
.footer-icp{letter-spacing:.04em}

/* ---------- 15. 移动端断点 ---------- */
@media (max-width:960px){
  .brand-tag{display:none}
  .header-actions{display:none}
  .nav-toggle{display:inline-flex}
  .nav-capsule{justify-content:space-between}
  .primary-nav{
    position:absolute;
    top:calc(100% + 10px);
    left:0;
    right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:12px;
    padding:16px;
    border-radius:var(--r-xl);
    background:rgba(251,248,242,.97);
    border:1px solid var(--line);
    box-shadow:var(--shadow-lift);
    -webkit-backdrop-filter:blur(18px) saturate(1.2);
    backdrop-filter:blur(18px) saturate(1.2);
  }
  .primary-nav[data-open="true"]{
    display:flex;
    animation:navDrop .22s var(--ease) both;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:4px}
  .nav-link{
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:12px 14px;
    border-radius:var(--r-md);
    font-size:1rem;
  }
  .nav-link[aria-current="page"]::after{
    position:static;
    transform:none;
  }
  .nav-foot{
    display:flex;
    flex-direction:column;
    gap:10px;
    padding-top:14px;
    border-top:1px dashed var(--line-strong);
  }
}

@media (max-width:640px){
  .footer-columns{grid-template-columns:1fr 1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

@keyframes navDrop{
  from{opacity:0;transform:translateY(-8px)}
  to{opacity:1;transform:none}
}

/* ---------- 16. 降低动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .scroll-progress-bar{transition:none}
}

/* ---------- 17. 打印与长文微调 ---------- */
@media print{
  .site-header,.site-footer,.to-top,.scroll-progress{display:none !important}
}