/* ============================================================
   必胜28站 / 共享外壳样式  /assets/site.css
   ============================================================ */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px);}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;background:none;}
img,svg,picture,video{max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;}
table{border-collapse:collapse;}
hr{border:0;}

/* ---------- tokens ---------- */
:root{
  --ink:#0B1B2B;
  --ink-soft:#0F2F3C;
  --ink-deep:#071320;
  --paper:#F4F0E6;
  --paper-dim:#E7E1D3;
  --cyan:#17E0C8;
  --cyan-soft:#7FF3E4;
  --orange:#FF6A2B;
  --orange-deep:#B8380A;
  --violet:#7A5CFF;
  --slate:#5C6B7A;
  --mist:#A9C6C9;
  --black:#101418;
  --yellow:#E9FF6B;
  --coral:#FF4D6D;

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC",sans-serif;
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC",serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",monospace;
  --font-body:"Inter","Noto Sans SC","PingFang SC",system-ui,sans-serif;

  --ease:cubic-bezier(0.2,0.7,0.1,1);
  --header-h:84px;
  --hair:rgba(169,198,201,.34);
  --hair-soft:rgba(169,198,201,.18);

  --shadow-frame:0 18px 44px -34px rgba(11,27,43,.9);
}

/* ---------- base ---------- */
body{
  background-color:var(--paper);
  color:var(--black);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(92,107,122,.055) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(92,107,122,.055) 1px,transparent 1px);
  background-size:24px 24px;
}
body.is-nav-open{overflow:hidden;}

#main-content{position:relative;z-index:1;display:block;}
#main-content:focus{outline:none;}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  letter-spacing:-.03em;
  line-height:1.15;
  text-wrap:balance;
}
h1{font-size:clamp(34px,5.2vw,64px);}
h2{font-size:clamp(26px,3.4vw,40px);}
h3{font-size:clamp(20px,2.2vw,28px);}
h4{font-size:clamp(17px,1.5vw,20px);}
p{max-width:38em;}
strong{font-weight:600;}
em{font-family:var(--font-serif);font-style:normal;}

a{text-decoration-thickness:1px;text-underline-offset:3px;}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:1px;
}
::selection{background:var(--orange);color:#140A05;}

/* ---------- shared utilities ---------- */
.wrap{
  width:100%;
  max-width:1480px;
  margin-inline:auto;
  padding-inline:clamp(16px,3.4vw,64px);
}
.section{padding-block:clamp(48px,6vw,96px);position:relative;}
.section--ink{background:var(--ink);color:var(--paper);}
.section--panel{background:var(--ink-soft);color:var(--paper);}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--slate);
  line-height:1.4;
}
.eyebrow::before{content:"";width:28px;height:2px;background:var(--orange);flex:none;}
.eyebrow--on-ink{color:var(--mist);}
.eyebrow--on-ink::before{background:var(--cyan);}

.tag-line{
  display:flex;
  align-items:center;
  gap:14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--slate);
}
.tag-line::after{content:"";flex:1 1 auto;height:1px;background:var(--hair);}

.lede{font-size:clamp(16px,1.3vw,19px);line-height:1.8;color:var(--slate);}
.on-ink .lede,.section--ink .lede{color:rgba(244,240,230,.76);}

.dot{
  display:inline-block;
  width:6px;height:6px;
  border-radius:50%;
  background:var(--yellow);
  flex:none;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  letter-spacing:.02em;
  line-height:1.2;
  padding:12px 22px;
  border:1px solid transparent;
  text-decoration:none;
  cursor:pointer;
  white-space:nowrap;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:transform .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn:hover{transform:translateY(-2px);}
.btn:active{transform:translateY(0);}
.btn--primary{background:var(--orange);color:#170A04;}
.btn--primary:hover{background:#FF8351;}
.btn--ghost{background:transparent;color:var(--paper);border-color:rgba(169,198,201,.46);}
.btn--ghost:hover{color:var(--cyan);border-color:var(--cyan);}
.btn--ink{background:var(--ink);color:var(--paper);}
.btn--ink:hover{background:var(--ink-soft);}
.btn--block{display:flex;width:100%;}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:200;
  transform:translateY(-180%);
  padding:10px 18px;
  background:var(--cyan);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  text-decoration:none;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0);}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:var(--ink);
  color:var(--paper);
  border-bottom:1px solid var(--hair);
  box-shadow:var(--shadow-frame);
}
.site-header::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background:linear-gradient(90deg,var(--cyan) 0 18%,var(--violet) 18% 32%,transparent 32% 100%);
  pointer-events:none;
}
.site-header__frame{
  max-width:1680px;
  margin-inline:auto;
  padding-inline:clamp(16px,2.4vw,40px);
  min-height:var(--header-h);
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(16px,2.4vw,44px);
}

.brand-cluster{display:flex;align-items:center;gap:14px;min-width:0;}
.brand{display:flex;flex-direction:column;gap:3px;text-decoration:none;color:var(--paper);}
.brand__mark{
  font-family:var(--font-display);
  font-weight:900;
  font-size:22px;
  line-height:1;
  letter-spacing:-.03em;
  white-space:nowrap;
}
.brand__mark b{color:var(--cyan);font-family:var(--font-mono);font-weight:700;letter-spacing:0;padding-inline:.05em;}
.brand__tag{
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--mist);
}
.version-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  line-height:1.5;
  color:var(--cyan-soft);
  background:rgba(23,224,200,.08);
  border:1px solid rgba(23,224,200,.42);
  clip-path:polygon(0 0,100% 0,100% 100%,8px 100%,0 calc(100% - 8px));
  white-space:nowrap;
}
.version-tag__key{font-size:9px;letter-spacing:.18em;color:var(--mist);}

.site-nav{justify-self:center;min-width:0;}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:clamp(6px,1.2vw,22px);
  margin:0;padding:0;
}
.site-nav__link{
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:9px 2px;
  color:rgba(244,240,230,.88);
  font-size:15px;
  font-weight:500;
  letter-spacing:.02em;
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.site-nav__num{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.1em;
  color:var(--mist);
  transition:color .2s var(--ease);
}
.site-nav__link:hover{color:var(--cyan-soft);border-bottom-color:rgba(23,224,200,.45);}
.site-nav__link:hover .site-nav__num{color:var(--cyan);}
.site-nav__link[aria-current="page"]{color:var(--cyan);border-bottom-color:var(--cyan);}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--cyan);}

.site-nav__foot{display:none;}

.header-actions{display:flex;align-items:center;gap:clamp(12px,1.6vw,22px);}
.header-contact{display:flex;flex-direction:column;gap:1px;text-align:right;line-height:1.5;}
.header-contact__k{font-family:var(--font-mono);font-size:9px;letter-spacing:.22em;color:var(--mist);}
.header-contact__v{font-family:var(--font-mono);font-size:11px;letter-spacing:.03em;color:rgba(244,240,230,.9);}
.header-cta{font-size:13px;padding:10px 18px;}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 14px;
  border:1px solid rgba(169,198,201,.46);
  color:var(--paper);
  font-size:12px;
  letter-spacing:.14em;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan);}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:16px;flex:none;}
.nav-toggle__bars i{display:block;height:1.5px;background:currentColor;transition:transform .22s var(--ease);}
.site-header[data-open="true"] .nav-toggle__bars i:first-child{transform:translateY(2.75px) rotate(45deg);}
.site-header[data-open="true"] .nav-toggle__bars i:last-child{transform:translateY(-2.75px) rotate(-45deg);}

.nav-scrim{
  position:fixed;
  inset:0;
  z-index:60;
  background:rgba(7,19,32,.72);
  opacity:0;
  visibility:hidden;
  transition:opacity .3s var(--ease),visibility .3s var(--ease);
}
.site-header[data-open="true"] .nav-scrim{opacity:1;visibility:visible;}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  z-index:2;
  margin-top:clamp(56px,7vw,110px);
  padding-block:clamp(48px,5.5vw,84px) 28px;
  background:var(--ink);
  color:var(--paper);
  border-top:1px solid var(--hair);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;left:0;
  width:min(38%,320px);
  height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
}
.site-footer__inner{
  max-width:1480px;
  margin-inline:auto;
  padding-inline:clamp(16px,3.4vw,64px);
  display:grid;
  grid-template-columns:1.35fr .8fr 1.25fr .9fr;
  gap:clamp(28px,3vw,56px);
  align-items:start;
}
.footer-block{min-width:0;}
.footer-block__title{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer-block__title::after{content:"";flex:1 1 auto;height:1px;background:var(--hair-soft);}

.footer-block--brand{display:flex;flex-direction:column;gap:14px;}
.footer-brand{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(22px,2vw,28px);
  letter-spacing:-.03em;
  line-height:1.1;
  text-decoration:none;
  color:var(--paper);
}
.footer-brand b{color:var(--cyan);font-family:var(--font-mono);letter-spacing:0;padding-inline:.05em;}
.footer-brand__note{font-size:14px;line-height:1.7;color:rgba(244,240,230,.72);max-width:26em;}
.footer-brand__badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  align-self:flex-start;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:var(--yellow);
  border:1px solid rgba(233,255,107,.34);
  background:rgba(233,255,107,.06);
  clip-path:polygon(0 0,100% 0,100% 100%,8px 100%,0 calc(100% - 8px));
}

.footer-list{display:flex;flex-direction:column;gap:10px;margin:0;padding:0;}
.footer-list a{
  display:inline-block;
  font-size:14px;
  color:rgba(244,240,230,.82);
  text-decoration:none;
  border-bottom:1px solid transparent;
  padding-bottom:1px;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-list a:hover{color:var(--cyan);border-bottom-color:var(--cyan);}

.footer-list--contact{gap:12px;}
.footer-list--contact li{display:grid;grid-template-columns:52px minmax(0,1fr);gap:10px;align-items:baseline;}
.footer-k{font-family:var(--font-mono);font-size:10px;letter-spacing:.14em;color:var(--mist);}
.footer-v{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.02em;
  line-height:1.6;
  color:var(--paper);
  overflow-wrap:anywhere;
}
.footer-note{
  margin-top:14px;
  font-size:13px;
  line-height:1.7;
  color:rgba(169,198,201,.92);
  max-width:30em;
}

.footer-block--meta{display:flex;flex-direction:column;gap:8px;}
.footer-meta{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:rgba(244,240,230,.86);
  max-width:none;
}
.footer-meta--dim{color:var(--mist);font-size:11px;}

.site-footer__base{
  max-width:1480px;
  margin:clamp(32px,4vw,56px) auto 0;
  padding-inline:clamp(16px,3.4vw,64px);
  padding-top:20px;
  border-top:1px solid var(--hair-soft);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 22px;
}
.footer-base__item{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(244,240,230,.86);
  max-width:none;
}
.footer-base__item--dim{color:var(--mist);}
.footer-scale{
  flex:1 1 200px;
  min-width:120px;
  height:8px;
  background-image:repeating-linear-gradient(90deg,rgba(23,224,200,.6) 0 1px,transparent 1px 12px);
}

/* ---------- breadcrumbs ---------- */
.breadcrumbs{padding-block:6px;}
.breadcrumbs ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  list-style:none;
  margin:0;padding:0;
}
.breadcrumbs li{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--slate);
}
.breadcrumbs li+li::before{content:"/";margin-right:8px;color:var(--mist);}
.breadcrumbs a{color:var(--slate);text-decoration:none;border-bottom:1px solid transparent;}
.breadcrumbs a:hover{color:var(--orange-deep);border-bottom-color:currentColor;}

/* ---------- media container (基础图片容器) ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  background:
    radial-gradient(120% 90% at 12% 0%,rgba(23,224,200,.16) 0%,transparent 58%),
    radial-gradient(100% 80% at 100% 100%,rgba(122,92,255,.22) 0%,transparent 62%),
    linear-gradient(150deg,var(--ink-soft) 0%,var(--ink) 64%,#122A44 100%);
  box-shadow:inset 0 0 0 1px var(--hair);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 20px),calc(100% - 20px) 100%,0 100%);
}
.media-frame img,
.media-frame picture,
.media-frame svg,
.media-frame video{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--16x9{aspect-ratio:16/9;}
.media-frame--4x3{aspect-ratio:4/3;}
.media-frame--1x1{aspect-ratio:1/1;}
.media-frame--tall{aspect-ratio:3/4;}
.media-frame__caption{
  position:absolute;
  left:0;bottom:0;
  max-width:calc(100% - 40px);
  padding:8px 14px;
  background:rgba(11,27,43,.86);
  color:var(--cyan-soft);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
}

/* ---------- reveal ---------- */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .42s var(--ease),transform .42s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
  will-change:opacity,transform;
}
.has-js [data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- responsive ---------- */
@media (max-width:1380px){
  .header-contact__v:first-of-type{display:none;}
}
@media (max-width:1200px){
  .header-contact{display:none;}
  :root{--header-h:76px;}
}
@media (max-width:1119px){
  :root{--header-h:72px;}
  .site-header__frame{
    grid-template-columns:minmax(0,1fr) auto;
    gap:12px;
    min-height:var(--header-h);
  }
  .brand-cluster{gap:10px;}
  .brand__mark{font-size:20px;}
  .header-cta{display:none;}
  .nav-toggle{display:inline-flex;}

  .site-nav{
    position:fixed;
    top:0;right:0;bottom:0;
    z-index:70;
    width:min(360px,88vw);
    display:flex;
    flex-direction:column;
    gap:22px;
    padding:calc(var(--header-h) + 26px) 24px 32px;
    background:var(--ink);
    border-left:1px solid var(--hair);
    box-shadow:-28px 0 64px -32px rgba(0,0,0,.75);
    overflow-y:auto;
    transform:translateX(103%);
    transition:transform .32s var(--ease);
    justify-self:stretch;
  }
  .site-header[data-open="true"] .site-nav{transform:translateX(0);}

  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;}
  .site-nav__item{border-bottom:1px solid var(--hair-soft);}
  .site-nav__link{
    display:flex;
    align-items:baseline;
    gap:12px;
    padding:15px 12px;
    font-size:16px;
    border-bottom:0;
    border-left:2px solid transparent;
  }
  .site-nav__link:hover{border-bottom-color:transparent;border-left-color:rgba(23,224,200,.5);}
  .site-nav__link[aria-current="page"]{
    border-left-color:var(--cyan);
    border-bottom-color:transparent;
    background:rgba(23,224,200,.07);
  }
  .site-nav__foot{
    display:flex;
    flex-direction:column;
    gap:10px;
    padding-top:20px;
    border-top:1px solid var(--hair-soft);
  }
  .site-nav__foot-line{
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.04em;
    color:var(--mist);
    max-width:none;
  }

  .site-footer__inner{grid-template-columns:1fr 1fr;}
  .footer-block--brand{grid-column:1 / -1;}
}
@media (max-width:760px){
  .site-footer__inner{grid-template-columns:1fr;gap:32px;}
  .site-footer__base{flex-direction:column;align-items:flex-start;gap:10px;}
  .footer-scale{flex:0 0 8px;width:100%;}
  .breadcrumbs li{font-size:10px;}
}
@media (max-width:420px){
  .brand__tag{display:none;}
  .version-tag{font-size:10px;padding:2px 7px;}
  .nav-toggle__text{display:none;}
  .nav-toggle{padding:11px 12px;}
}

/* ---------- motion preferences ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
  .has-js [data-reveal]{
    opacity:1 !important;
    transform:none !important;
    transition:none !important;
  }
  .btn:hover{transform:none;}
}