/* ============================================================
   奇博赛场 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. Tokens ---------- */
:root{
  --green:#0E7C66;
  --moss:#1D4A3C;
  --flame:#F05A32;
  --clay:#C86B3F;
  --ink:#191B38;
  --night:#3A2D5C;
  --stone:#6A6E68;
  --paper:#F4EFE2;
  --paper-2:#EDE7D8;
  --paper-3:#FBF7EC;
  --silver:#B8C0C6;
  --speed:#F2C14E;

  --line:rgba(25,27,56,.14);
  --line-soft:rgba(25,27,56,.08);
  --line-light:rgba(244,239,226,.20);

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

  --gap:clamp(16px,2.2vw,28px);
  --sp-section:clamp(52px,7.5vw,108px);
  --radius:2px;

  --shadow-1:0 1px 2px rgba(25,27,56,.06),0 10px 24px -20px rgba(25,27,56,.55);
  --shadow-2:0 2px 6px rgba(25,27,56,.10),0 26px 44px -30px rgba(25,27,56,.62);
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    radial-gradient(1200px 620px at 88% -12%,rgba(14,124,102,.10),transparent 62%),
    radial-gradient(900px 520px at -12% 18%,rgba(200,107,63,.09),transparent 60%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
::selection{background:var(--flame);color:var(--ink)}
h1,h2,h3,h4,h5{font-weight:800;line-height:1.2;letter-spacing:0}
h1{font-size:clamp(30px,4.2vw,46px);font-weight:900;line-height:1.14}
h2{font-size:clamp(24px,3vw,34px)}
h3{font-size:clamp(19px,2.2vw,24px);line-height:1.32}
h4{font-size:18px}
strong{font-weight:800}
small{font-size:13px}

:focus-visible{outline:2px solid var(--flame);outline-offset:3px;border-radius:2px}
.site-footer :focus-visible,.nav :focus-visible{outline-color:var(--speed)}

.sr-only{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 4. 布局容器 ---------- */
.shell{
  width:100%;
  max-width:1200px;
  margin-inline:auto;
  padding-inline:clamp(18px,4vw,40px);
}
.section{padding-block:var(--sp-section)}
.section--tight{padding-block:clamp(28px,4vw,56px)}
.section--dark{background:var(--ink);color:var(--paper)}
.section--dark h1,.section--dark h2,.section--dark h3{color:var(--paper)}

.grid{display:grid;gap:var(--gap)}
.grid--2,.grid--3,.grid--4,.grid--split{grid-template-columns:1fr}
@media (min-width:720px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:1024px){
  .grid--3{grid-template-columns:repeat(3,1fr)}
  .grid--4{grid-template-columns:repeat(4,1fr)}
  .grid--split{grid-template-columns:1.4fr .6fr}
}

/* ---------- 5. 排版组件 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--green);
}
.eyebrow::before{
  content:"";width:22px;height:3px;background:var(--flame);
  transform:skewX(-20deg);flex:none;
}
.section--dark .eyebrow{color:var(--silver)}

.display{
  display:inline-block;
  font-size:clamp(38px,8vw,92px);
  font-weight:900;
  line-height:.94;
  letter-spacing:-.02em;
  transform:skewX(-7deg);
  transform-origin:0% 82%;
  text-wrap:balance;
}
.display--sm{font-size:clamp(27px,4.6vw,52px);line-height:1.02}

.chapter-num{
  display:block;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(44px,9vw,120px);
  line-height:.78;
  letter-spacing:-.04em;
  color:rgba(25,27,56,.12);
}
.section--dark .chapter-num{color:rgba(244,239,226,.16)}

.lede{
  max-width:60ch;
  font-size:clamp(17px,2vw,20px);
  line-height:1.7;
  color:var(--stone);
}
.section--dark .lede{color:rgba(244,239,226,.72)}

.prose{max-width:68ch;font-size:17px;line-height:1.8}
.prose p+p{margin-top:1em}
.prose h2{margin-top:1.8em;margin-bottom:.6em}
.prose h3{margin-top:1.5em;margin-bottom:.5em}
.prose ul,.prose ol{margin-block:1em;padding-left:1.2em;list-style:disc}
.prose li+li{margin-top:.4em}

.meta{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--stone);
  text-transform:uppercase;
}

.breadcrumb{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--stone)}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";color:var(--silver)}
.breadcrumb a{color:var(--stone);border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease}
.breadcrumb a:hover{color:var(--green);border-color:var(--green)}
.breadcrumb [aria-current="page"]{color:var(--ink)}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;
  font-size:15px;font-weight:800;line-height:1;
  letter-spacing:.02em;
  border:1px solid transparent;
  border-radius:var(--radius);
  transition:transform .2s ease,background-color .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.btn:hover{transform:translate(-1px,-2px)}
.btn:active{transform:translate(0,0)}

.btn--primary{
  background:var(--flame);
  color:var(--ink);
  box-shadow:inset 0 -3px 0 rgba(25,27,56,.28);
}
.btn--primary:hover{background:#ff6a42;box-shadow:inset 0 -3px 0 rgba(25,27,56,.34),0 12px 20px -14px rgba(240,90,50,.9)}

.btn--line{
  background:transparent;
  border-color:var(--ink);
  color:var(--ink);
}
.btn--line:hover{background:var(--ink);color:var(--paper)}

.btn--ghost{
  background:transparent;
  border-color:rgba(244,239,226,.55);
  color:var(--paper);
}
.btn--ghost:hover{background:var(--paper);color:var(--moss);border-color:var(--paper)}

/* ---------- 7. 卡片 / 标签 / 图像容器 ---------- */
.card{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  background:var(--paper-3);
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  box-shadow:var(--shadow-1);
  transition:transform .24s ease,box-shadow .24s ease,border-color .24s ease;
}
.card:hover{transform:translate(4px,-4px);box-shadow:var(--shadow-2);border-color:var(--line)}
.card--dark{
  background:linear-gradient(152deg,var(--moss) 0%,var(--ink) 68%,var(--night) 100%);
  border-color:rgba(244,239,226,.14);
  color:var(--paper);
}
.card--dark .card__text{color:rgba(244,239,226,.74)}
.card__title{font-size:clamp(18px,2vw,22px);font-weight:800;line-height:1.3}
.card__text{margin-top:8px;font-size:15px;line-height:1.72;color:var(--stone)}

.chip-row{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 11px;
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.08em;
  color:var(--moss);
  background:rgba(255,255,255,.5);
  border:1px solid var(--line);
  border-radius:999px;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.chip:hover{border-color:var(--green);color:var(--green)}
.chip[aria-pressed="true"]{background:var(--green);border-color:var(--green);color:var(--paper)}

.media{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:4/3;
  background:linear-gradient(150deg,var(--moss),var(--ink));
  border:1px solid var(--line-soft);
}
.media--wide{aspect-ratio:16/9}
.media--tall{aspect-ratio:3/4}
.media--diag{clip-path:polygon(0 0,100% 0,100% 90%,0 100%)}
.media__img{width:100%;height:100%;object-fit:cover}
.media__cap{
  position:absolute;left:0;right:0;bottom:0;
  padding:10px 12px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--paper);
  background:linear-gradient(0deg,rgba(25,27,56,.82),rgba(25,27,56,0));
}

/* ---------- 8. 页头 ---------- */
.skip-link{
  position:fixed;left:12px;top:-120px;z-index:999;
  padding:10px 18px;
  background:var(--flame);color:var(--ink);
  font-weight:800;font-size:14px;
  border-radius:var(--radius);
  transition:top .18s ease;
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--paper);
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(255,255,255,.6);
}

.topbar{
  overflow:hidden;
  max-height:44px;
  background:linear-gradient(90deg,var(--moss) 0%,var(--ink) 62%,var(--night) 100%);
  color:var(--paper);
  transition:max-height .26s ease,opacity .2s ease;
}
.topbar__inner{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  min-height:34px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.08em;
}
.topbar__brand{color:rgba(244,239,226,.92);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar__support{color:rgba(244,239,226,.62);white-space:nowrap}
.topbar__link{
  color:var(--speed);
  white-space:nowrap;
  border-bottom:1px solid transparent;
  padding-bottom:1px;
  transition:border-color .18s ease,color .18s ease;
}
.topbar__link:hover{border-color:var(--speed);color:#ffe08a}

.mainbar{position:relative}
.mainbar__inner{
  display:flex;align-items:center;gap:clamp(10px,1.8vw,26px);
  padding-block:14px;
  transition:padding .24s ease;
}

.site-header[data-scrolled] .topbar{max-height:0;opacity:0}
.site-header[data-scrolled] .mainbar__inner{padding-block:9px}

.brand{
  display:inline-flex;align-items:center;gap:10px;
  margin-right:auto;
  flex:none;
}
.brand__mark{
  display:grid;place-items:center;
  width:38px;height:38px;
  background:linear-gradient(140deg,var(--green) 0%,var(--moss) 100%);
  color:var(--paper);
  font-size:19px;font-weight:900;line-height:1;
  transform:skewX(-8deg);
  box-shadow:inset 0 0 0 1px rgba(244,239,226,.22),0 8px 16px -12px rgba(14,124,102,.9);
}
.brand__text{display:flex;flex-direction:column;line-height:1.02}
.brand__name{font-size:19px;font-weight:900;letter-spacing:.02em;color:var(--ink)}
.brand__sub{
  margin-top:4px;
  font-family:var(--font-mono);
  font-size:10px;letter-spacing:.18em;
  color:var(--stone);
}

.nav{display:flex;align-items:center}
.nav__list{display:flex;align-items:center;gap:clamp(8px,1.6vw,24px)}
.nav__item{position:relative}
.nav__link{
  position:relative;
  display:inline-block;
  padding:6px 2px 8px;
  font-size:15px;font-weight:600;
  color:#2B2E4A;
  white-space:nowrap;
  transition:color .18s ease;
}
.nav__link::after{
  content:"";
  position:absolute;left:0;right:0;bottom:0;
  height:3px;background:var(--flame);
  transform:skewX(-20deg) scaleX(0);
  transform-origin:left center;
  transition:transform .22s ease,background-color .22s ease;
}
.nav__link:hover{color:var(--green)}
.nav__link:hover::after{transform:skewX(-20deg) scaleX(1)}
.nav__link[aria-current="page"]{color:var(--moss)}
.nav__link[aria-current="page"]::after{background:var(--green);transform:skewX(-20deg) scaleX(1)}

.nav__foot{display:none}

.mainbar__cta{flex:none}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:10px 13px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.12em;
  transition:border-color .18s ease,color .18s ease;
}
.nav-toggle:hover{border-color:var(--green);color:var(--green)}
.nav-toggle__bars{position:relative;display:block;width:18px;height:2px;background:currentColor;transition:background-color .18s ease}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;
  width:18px;height:2px;background:currentColor;
  transition:transform .2s 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{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}

.header-progress{
  position:absolute;left:0;right:0;bottom:-1px;
  height:3px;
  background:rgba(25,27,56,.08);
  overflow:hidden;
}
.header-progress__bar{
  display:block;width:100%;height:100%;
  background:linear-gradient(90deg,var(--green) 0%,var(--flame) 66%,var(--speed) 100%);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .1s linear;
}

@media (max-width:899px){
  .nav-toggle{display:inline-flex}
  .mainbar__cta{display:none}
  .nav{
    position:absolute;left:0;right:0;top:100%;
    display:block;
    padding:10px clamp(18px,5vw,40px) 22px;
    background:linear-gradient(158deg,var(--moss) 0%,var(--ink) 72%,var(--night) 100%);
    color:var(--paper);
    border-bottom:3px solid var(--flame);
    box-shadow:0 28px 44px -26px rgba(0,0,0,.72);
    max-height:calc(100vh - 70px);
    overflow-y:auto;
    opacity:0;visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .2s ease,transform .2s ease,visibility .2s;
  }
  .nav[data-open]{opacity:1;visibility:visible;transform:translateY(0)}
  .nav__list{display:grid;gap:0;counter-reset:navitem}
  .nav__item{counter-increment:navitem;border-bottom:1px solid rgba(244,239,226,.14)}
  .nav__link{
    display:flex;align-items:center;gap:12px;
    padding:14px 0 14px 12px;
    font-size:17px;font-weight:700;
    color:var(--paper);
    border-left:3px solid transparent;
  }
  .nav__link::before{
    content:counter(navitem,decimal-leading-zero);
    font-family:var(--font-mono);
    font-size:11px;letter-spacing:.12em;
    color:var(--speed);
    min-width:2.2em;
  }
  .nav__link::after{display:none}
  .nav__link:hover,.nav__link[aria-current="page"]{color:var(--paper);background:rgba(244,239,226,.06)}
  .nav__item:nth-child(6n+1) .nav__link{border-left-color:var(--green)}
  .nav__item:nth-child(6n+2) .nav__link{border-left-color:var(--flame)}
  .nav__item:nth-child(6n+3) .nav__link{border-left-color:var(--speed)}
  .nav__item:nth-child(6n+4) .nav__link{border-left-color:var(--clay)}
  .nav__item:nth-child(6n+5) .nav__link{border-left-color:var(--silver)}
  .nav__item:nth-child(6n+6) .nav__link{border-left-color:var(--green)}
  .nav__foot{display:block;margin-top:20px}
  .nav__foot .btn{width:100%}
}

@media (max-width:719px){
  .topbar__support{display:none}
  .brand__sub{display:none}
}
@media (max-width:479px){
  .topbar__inner{font-size:10px;letter-spacing:.04em}
  .topbar__brand{max-width:58%}
}

/* ---------- 9. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,104px);
  background:linear-gradient(168deg,var(--moss) 0%,var(--ink) 56%,var(--night) 100%);
  color:var(--paper);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;left:0;right:0;top:0;height:5px;
  background:linear-gradient(90deg,var(--flame) 0 24%,var(--clay) 24% 44%,var(--green) 44% 68%,var(--silver) 68% 84%,var(--speed) 84% 100%);
}
.site-footer::after{
  content:"";
  position:absolute;right:-12%;bottom:-34%;
  width:62%;height:74%;
  background:radial-gradient(closest-side,rgba(14,124,102,.38),rgba(14,124,102,0) 72%);
  pointer-events:none;
}

.footer__grid{
  position:relative;z-index:1;
  display:grid;gap:clamp(26px,3.4vw,44px);
  grid-template-columns:1fr;
  padding-block:clamp(42px,6vw,74px) clamp(30px,4vw,48px);
}
@media (min-width:720px){
  .footer__grid{grid-template-columns:repeat(2,1fr)}
  .footer__brand{grid-column:1 / -1}
}
@media (min-width:1024px){
  .footer__grid{grid-template-columns:1.7fr .8fr .8fr .8fr 1.3fr}
  .footer__brand{grid-column:auto}
}

.footer__brand{max-width:42ch}
.footer__logo{display:inline-flex;align-items:center;gap:10px}
.footer__logo-mark{
  display:grid;place-items:center;
  width:34px;height:34px;
  background:var(--flame);color:var(--ink);
  font-size:17px;font-weight:900;line-height:1;
  transform:skewX(-8deg);
}
.footer__logo-text{
  display:flex;flex-direction:column;
  font-size:18px;font-weight:900;line-height:1.05;
  color:var(--paper);
}
.footer__logo-text em{
  margin-top:4px;
  font-family:var(--font-mono);font-style:normal;
  font-size:10px;letter-spacing:.18em;
  color:var(--silver);
}
.footer__intro{
  margin-top:16px;
  font-size:15px;line-height:1.75;
  color:rgba(244,239,226,.78);
}
.footer__tag{
  display:inline-flex;align-items:center;gap:9px;
  margin-top:16px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.1em;
  color:var(--speed);
}
.dot{
  display:inline-block;width:7px;height:7px;border-radius:50%;
  background:var(--flame);
  box-shadow:0 0 0 3px rgba(240,90,50,.22);
  flex:none;
}

.footer__title{
  position:relative;
  margin-bottom:14px;padding-left:11px;
  font-family:var(--font-mono);
  font-size:11px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;
  color:var(--silver);
}
.footer__title::before{
  content:"";position:absolute;left:0;top:50%;
  width:5px;height:5px;margin-top:-2.5px;
  background:var(--flame);
  transform:skewX(-16deg);
}
.footer__links{display:grid;gap:10px}
.footer__link{
  display:inline-block;
  font-size:15px;
  color:rgba(244,239,226,.82);
  transition:color .18s ease,transform .18s ease;
}
.footer__link:hover,.footer__link:focus-visible{color:var(--speed);transform:translateX(4px)}

.footer__list{display:grid;gap:12px}
.footer__row{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.footer__key{
  display:block;flex:0 0 100%;
  font-family:var(--font-mono);
  font-size:10px;letter-spacing:.14em;
  color:var(--silver);
}
.footer__value{
  font-size:14px;line-height:1.6;
  color:rgba(244,239,226,.88);
  word-break:break-word;
}
.copy-btn{
  padding:2px 10px;
  font-family:var(--font-mono);
  font-size:10px;letter-spacing:.1em;
  color:var(--silver);
  border:1px solid rgba(244,239,226,.28);
  border-radius:999px;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.copy-btn:hover{border-color:var(--speed);color:var(--speed)}
.copy-btn[data-copied]{background:var(--speed);border-color:var(--speed);color:var(--ink)}
.copy-btn__text{display:inline-block;line-height:1.6}

.footer__note{
  margin-top:18px;
  font-size:12px;line-height:1.72;
  color:rgba(244,239,226,.58);
}

.footer__legal{
  position:relative;z-index:1;
  border-top:1px solid rgba(244,239,226,.16);
  background:rgba(0,0,0,.16);
}
.footer__legal-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:8px 24px;
  padding-block:18px;
}
.footer__legal-text{
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.1em;
  color:rgba(244,239,226,.62);
}
.footer__legal-text--right{text-align:right}

/* ---------- 10. 滚动显现 ---------- */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .52s ease,transform .52s cubic-bezier(.2,.72,.3,1);
}
.has-js [data-reveal][data-revealed]{opacity:1;transform:none}

/* ---------- 11. 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    transition-duration:.001ms !important;
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .btn:hover,.card:hover,.footer__link:hover{transform:none}
}