/* ==========================================================================
   优乐玩平台 · 共享样式表 /assets/site.css
   纸页叠层 + 深靛蓝底 + 橘红锚点 + 暖黄角标
   ========================================================================== */

:root{
  --c-orange:#FF5A2A;
  --c-blue:#1F6BFF;
  --c-yellow:#FFC93C;
  --c-indigo:#0B1033;
  --c-indigo-2:#1A2461;
  --c-paper:#F7F3EA;
  --c-ink:#101426;
  --c-mist:#A7B0C8;
  --c-mint:#2ED47A;
  --c-coral:#E5484D;
  --c-print:#080A14;

  --r-s:10px;
  --r-m:16px;
  --r-l:24px;
  --r-pill:999px;

  --edge:2px solid var(--c-print);
  --lift:6px 6px 0 rgba(8,10,20,.88);
  --lift-hi:10px 10px 0 rgba(8,10,20,.88);

  --font-head:"Space Grotesk","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","Sarasa Mono SC","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --wrap:1240px;
  --gutter:clamp(16px,4vw,44px);
  --header-h:76px;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;min-height:100vh;}
img,picture,svg,video{max-width:100%;}
button{font:inherit;color:inherit;}
ul,ol{list-style:none;margin:0;padding:0;}
p{margin:0;}
::selection{background:var(--c-orange);color:var(--c-ink);}

/* ---------- 中文排版基线 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  color:var(--c-paper);
  background-color:var(--c-indigo);
  background-image:
    radial-gradient(1100px 560px at 88% -12%,rgba(31,107,255,.30),transparent 62%),
    radial-gradient(880px 520px at 2% 2%,rgba(255,90,42,.18),transparent 58%),
    linear-gradient(180deg,#0B1033 0%,#101740 60%,#0B1033 100%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.12;
  letter-spacing:-.01em;
  color:inherit;
  text-wrap:balance;
}
h1{font-size:clamp(2.25rem,5.4vw,4.5rem);line-height:.98;font-weight:900;letter-spacing:-.025em;}
h2{font-size:clamp(1.6rem,3.2vw,2.5rem);}
h3{font-size:clamp(1.2rem,2.2vw,1.6rem);}

a{color:inherit;}
strong,b{font-weight:800;}

code,kbd,samp,pre{font-family:var(--font-mono);font-size:.92em;}

/* ---------- 焦点可见 ---------- */
:focus-visible{
  outline:3px solid var(--c-yellow);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------- 容器 ---------- */
.u-container{
  width:min(calc(100% - var(--gutter) * 2),var(--wrap));
  margin-inline:auto;
}

.page-main{
  padding-top:calc(var(--header-h) + clamp(16px,3vw,36px));
  padding-bottom:clamp(24px,4vw,56px);
}

.section{padding-block:clamp(36px,5vw,72px);}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.16em;
  color:var(--c-yellow);
}
.eyebrow::before{
  content:"";
  width:22px;
  height:3px;
  border-radius:2px;
  background:var(--c-orange);
  flex:0 0 auto;
}

/* ---------- 按钮 ---------- */
.btn{
  --btn-bg:var(--c-paper);
  --btn-fg:var(--c-ink);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border-radius:var(--r-pill);
  border:var(--edge);
  background:var(--btn-bg);
  color:var(--btn-fg);
  font-family:var(--font-head);
  font-size:15px;
  font-weight:800;
  line-height:1.2;
  letter-spacing:.01em;
  text-decoration:none;
  white-space:nowrap;
  cursor:pointer;
  box-shadow:4px 4px 0 rgba(8,10,20,.88);
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn:hover{
  color:var(--btn-fg);
  transform:translate(-1px,-2px);
  box-shadow:6px 7px 0 rgba(8,10,20,.88);
}
.btn:active{
  transform:translate(2px,2px);
  box-shadow:2px 2px 0 rgba(8,10,20,.88);
}
.btn--primary{--btn-bg:var(--c-orange);--btn-fg:var(--c-ink);}
.btn--accent{--btn-bg:var(--c-blue);--btn-fg:var(--c-paper);}
.btn--ghost{
  --btn-bg:transparent;
  --btn-fg:var(--c-paper);
  border-color:rgba(247,243,234,.5);
  box-shadow:none;
}
.btn--ghost:hover{
  --btn-bg:rgba(247,243,234,.10);
  border-color:var(--c-yellow);
  box-shadow:none;
  transform:none;
}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border-radius:var(--r-pill);
  border:1.5px solid rgba(247,243,234,.28);
  background:rgba(247,243,234,.10);
  color:var(--c-paper);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  line-height:1.5;
}
.tag--yellow{background:var(--c-yellow);color:var(--c-ink);border-color:var(--c-print);}
.tag--orange{background:var(--c-orange);color:var(--c-ink);border-color:var(--c-print);}
.tag--mint{background:var(--c-mint);color:var(--c-ink);border-color:var(--c-print);}

/* ---------- 卡片 ---------- */
.paper-card{
  background:var(--c-paper);
  color:var(--c-ink);
  border:var(--edge);
  border-radius:var(--r-m);
  box-shadow:var(--lift);
  padding:clamp(18px,2.4vw,28px);
}

/* ---------- 媒体容器基础规则 ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  width:100%;
  border:var(--edge);
  border-radius:var(--r-m);
  background:
    radial-gradient(120% 90% at 80% 0%,rgba(31,107,255,.42),transparent 62%),
    linear-gradient(150deg,var(--c-indigo-2) 0%,var(--c-indigo) 78%);
  box-shadow:var(--lift);
}
.media-frame > img,
.media-frame > picture,
.media-frame > picture > img,
.media-frame > svg{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame__hint{
  position:absolute;
  inset:auto 0 0 0;
  padding:10px 14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--c-mist);
  background:linear-gradient(180deg,transparent,rgba(8,10,20,.72));
}
.media-frame--16x9{aspect-ratio:16/9;}
.media-frame--3x2{aspect-ratio:3/2;}
.media-frame--4x3{aspect-ratio:4/3;}
.media-frame--1x1{aspect-ratio:1/1;}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--c-mist);
}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
}
.breadcrumb__list li{display:inline-flex;align-items:center;}
.breadcrumb__list li + li::before{
  content:"/";
  margin-inline-end:6px;
  color:rgba(167,176,200,.55);
}
.breadcrumb a{
  color:var(--c-mist);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.breadcrumb a:hover{color:var(--c-yellow);border-bottom-color:currentColor;}
.breadcrumb [aria-current="page"]{color:var(--c-paper);}

/* ---------- 正文 ---------- */
.prose{
  max-width:42em;
  font-size:17px;
  line-height:1.78;
  color:rgba(247,243,234,.9);
}
.prose p{margin:0 0 1.1em;}
.prose p:last-child{margin-bottom:0;}
.prose h2,.prose h3{color:var(--c-paper);margin:1.6em 0 .6em;}
.prose a{color:var(--c-yellow);text-underline-offset:3px;}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.2vw,28px);}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}

/* ==========================================================================
   HEADER
   ========================================================================== */
.skip-link{
  position:fixed;
  top:12px;
  left:12px;
  z-index:400;
  padding:10px 18px;
  border:var(--edge);
  border-radius:var(--r-s);
  background:var(--c-yellow);
  color:var(--c-ink);
  font-family:var(--font-head);
  font-size:14px;
  font-weight:800;
  text-decoration:none;
  box-shadow:var(--lift);
  transform:translateY(-180%);
  transition:transform .18s ease;
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);}

.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:200;
  border-bottom:2px solid transparent;
  background:linear-gradient(180deg,rgba(11,16,51,.94) 0%,rgba(11,16,51,.70) 58%,rgba(11,16,51,0) 100%);
  transition:background-color .3s ease,border-color .3s ease,box-shadow .3s ease;
}
.site-header.is-scrolled{
  background:rgba(8,12,38,.97);
  -webkit-backdrop-filter:blur(12px) saturate(140%);
  backdrop-filter:blur(12px) saturate(140%);
  border-bottom-color:var(--c-orange);
  box-shadow:0 12px 34px rgba(3,5,18,.6);
}

.header__inner{
  width:min(calc(100% - var(--gutter) * 2),var(--wrap));
  margin-inline:auto;
  min-height:var(--header-h);
  display:flex;
  align-items:center;
  gap:clamp(10px,1.8vw,26px);
}

.header__brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex:0 0 auto;
  text-decoration:none;
  color:var(--c-paper);
}
.header__brand:hover{color:var(--c-paper);}
.header__mark{
  width:40px;
  height:40px;
  display:grid;
  place-items:center;
  flex:0 0 auto;
  border:var(--edge);
  border-radius:11px;
  background:var(--c-orange);
  color:var(--c-ink);
  font-family:var(--font-head);
  font-size:19px;
  font-weight:900;
  line-height:1;
  box-shadow:3px 3px 0 rgba(8,10,20,.9);
  transform:rotate(-5deg);
  transition:transform .22s ease;
}
.header__brand:hover .header__mark{transform:rotate(4deg) scale(1.05);}
.header__brand-text{display:flex;flex-direction:column;line-height:1.1;}
.header__brand-name{
  font-family:var(--font-head);
  font-size:18px;
  font-weight:800;
  letter-spacing:.01em;
}
.header__brand-sub{
  margin-top:3px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.09em;
  color:var(--c-mist);
  white-space:nowrap;
}

.site-nav{margin-inline-start:auto;}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
}
.site-nav__item{display:block;}
.site-nav__link{
  display:inline-block;
  padding:9px 13px;
  border:2px solid transparent;
  border-radius:var(--r-pill);
  font-size:15px;
  font-weight:500;
  line-height:1.4;
  color:rgba(247,243,234,.86);
  text-decoration:none;
  white-space:nowrap;
  transition:color .18s ease,background-color .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.site-nav__link:hover{
  color:var(--c-paper);
  background:rgba(247,243,234,.10);
  border-color:rgba(247,243,234,.22);
}
.site-nav__link[aria-current="page"]{
  color:var(--c-ink);
  background:var(--c-yellow);
  border-color:var(--c-print);
  box-shadow:3px 3px 0 rgba(8,10,20,.9);
  font-weight:800;
}
.site-nav__item--cta{margin-inline-start:10px;}
.site-nav__cta{padding:9px 18px;font-size:14px;}

.header__actions{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}

.lang-pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 15px;
  border:var(--edge);
  border-radius:var(--r-pill);
  background:var(--c-orange);
  color:var(--c-ink);
  font-family:var(--font-head);
  font-size:13px;
  font-weight:800;
  letter-spacing:.02em;
  line-height:1.4;
  text-decoration:none;
  white-space:nowrap;
  box-shadow:3px 3px 0 rgba(8,10,20,.9);
  transition:transform .2s ease,box-shadow .2s ease,background-color .2s ease;
}
.lang-pill:hover{
  color:var(--c-ink);
  background:#FF6E45;
  transform:rotate(-2deg) translateY(-1px);
  box-shadow:5px 6px 0 rgba(8,10,20,.9);
}
.lang-pill__dot{
  width:8px;
  height:8px;
  flex:0 0 auto;
  border:1.5px solid var(--c-print);
  border-radius:50%;
  background:var(--c-mint);
}
.lang-pill__label{display:inline-block;}

.nav-toggle{
  display:none;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  width:46px;
  height:46px;
  padding:0;
  border:var(--edge);
  border-radius:12px;
  background:var(--c-paper);
  color:var(--c-ink);
  box-shadow:3px 3px 0 rgba(8,10,20,.9);
  cursor:pointer;
  transition:background-color .18s ease,transform .18s ease,box-shadow .18s ease;
}
.nav-toggle:hover{background:var(--c-yellow);}
.nav-toggle:active{transform:translate(2px,2px);box-shadow:1px 1px 0 rgba(8,10,20,.9);}
.nav-toggle__bar{
  display:block;
  width:20px;
  height:2.5px;
  border-radius:2px;
  background:currentColor;
  transition:transform .22s ease,opacity .22s ease;
}
.site-header[data-open] .nav-toggle__bar:nth-child(1){transform:translateY(7.5px) rotate(45deg);}
.site-header[data-open] .nav-toggle__bar:nth-child(2){opacity:0;}
.site-header[data-open] .nav-toggle__bar:nth-child(3){transform:translateY(-7.5px) rotate(-45deg);}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,120px);
  padding-top:clamp(40px,5vw,68px);
  background:linear-gradient(180deg,#0A0F2E 0%,#060A1F 100%);
  border-top:2px solid rgba(255,201,60,.34);
  color:var(--c-paper);
}

.footer__inner{
  display:grid;
  grid-template-columns:minmax(260px,1.3fr) repeat(3,minmax(130px,.72fr));
  gap:clamp(24px,3.4vw,56px);
  padding-bottom:clamp(30px,4vw,52px);
  border-bottom:1px dashed rgba(167,176,200,.28);
}

.footer__brand{display:block;}
.footer__logo{
  display:inline-flex;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:var(--c-paper);
}
.footer__logo:hover{color:var(--c-paper);}
.footer__mark{
  width:36px;
  height:36px;
  display:grid;
  place-items:center;
  flex:0 0 auto;
  border:var(--edge);
  border-radius:10px;
  background:var(--c-orange);
  color:var(--c-ink);
  font-family:var(--font-head);
  font-size:17px;
  font-weight:900;
  line-height:1;
  box-shadow:3px 3px 0 rgba(8,10,20,.9);
  transform:rotate(-5deg);
}
.footer__name{
  font-family:var(--font-head);
  font-size:20px;
  font-weight:900;
  letter-spacing:.01em;
}
.footer__statement{
  margin-top:16px;
  max-width:34ch;
  font-size:15px;
  line-height:1.72;
  color:var(--c-mist);
}
.footer__contact{
  margin-top:20px;
  display:grid;
  gap:6px;
  font-style:normal;
  font-size:13px;
  line-height:1.7;
  color:var(--c-mist);
  word-break:break-word;
}
.footer__contact p{margin:0;}
.footer__contact-key{
  display:inline-block;
  min-width:4.8em;
  margin-inline-end:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--c-yellow);
}

.footer__col{display:block;}
.footer__col-title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.14em;
  color:var(--c-yellow);
  line-height:1.5;
}
.footer__list{display:grid;gap:9px;}
.footer__list a{
  display:inline-block;
  padding-bottom:1px;
  border-bottom:2px solid transparent;
  color:rgba(247,243,234,.82);
  font-size:15px;
  line-height:1.6;
  text-decoration:none;
  transition:color .18s ease,border-color .18s ease;
}
.footer__list a:hover{color:var(--c-paper);border-bottom-color:var(--c-orange);}

.footer__tape-wrap{padding-block:clamp(20px,2.6vw,32px);}
.footer__tape{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.footer__tape li{
  padding:5px 13px;
  border:1.5px dashed rgba(167,176,200,.42);
  border-radius:var(--r-pill);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--c-mist);
}

.footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-block:18px 26px;
  border-top:1px solid rgba(167,176,200,.22);
  font-size:12.5px;
  color:var(--c-mist);
}
.footer__legal{
  font-family:var(--font-mono);
  letter-spacing:.03em;
}
.footer__copy{letter-spacing:.02em;}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:clamp(14px,2.5vw,28px);
  bottom:clamp(14px,2.5vw,28px);
  z-index:180;
  width:52px;
  height:52px;
  display:grid;
  place-items:center;
  padding:0;
  border:var(--edge);
  border-radius:14px;
  background:var(--c-yellow);
  color:var(--c-ink);
  font-family:var(--font-head);
  font-size:20px;
  font-weight:900;
  line-height:1;
  cursor:pointer;
  box-shadow:4px 4px 0 rgba(8,10,20,.88);
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  transition:opacity .25s ease,transform .25s ease,visibility .25s ease,box-shadow .18s ease,background-color .18s ease;
}
.to-top:hover{
  background:var(--c-orange);
  box-shadow:6px 6px 0 rgba(8,10,20,.88);
}
.to-top[data-visible="true"]{
  opacity:1;
  visibility:visible;
  transform:translateY(0);
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1024px){
  .footer__inner{grid-template-columns:repeat(3,minmax(0,1fr));}
  .footer__brand{grid-column:1 / -1;}
}

@media (min-width:901px) and (max-width:1080px){
  .site-nav__item--cta{display:none;}
}

@media (max-width:900px){
  :root{--header-h:66px;}

  .site-header,
  .site-header.is-scrolled{
    background:rgba(9,13,42,.97);
    -webkit-backdrop-filter:blur(12px);
    backdrop-filter:blur(12px);
    border-bottom:2px solid rgba(255,201,60,.32);
  }
  .site-header.is-scrolled{border-bottom-color:var(--c-orange);}

  .header__inner{min-height:var(--header-h);gap:12px;}
  .header__actions{margin-inline-start:auto;}
  .nav-toggle{display:flex;}

  .site-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    margin:0;
    padding:10px var(--gutter) 22px;
    background:#0A0F2E;
    border-bottom:2px solid var(--c-orange);
    box-shadow:0 24px 40px rgba(3,5,18,.65);
    max-height:calc(100vh - var(--header-h) - 4px);
    overflow-y:auto;
    display:none;
  }
  .site-header[data-open] .site-nav{display:block;}

  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:6px;
  }
  .site-nav__item--cta{margin:12px 0 0;}
  .site-nav__link{
    display:block;
    padding:13px 16px;
    border:2px solid rgba(167,176,200,.22);
    border-radius:12px;
    background:rgba(247,243,234,.04);
    font-size:16px;
  }
  .site-nav__link[aria-current="page"]{
    background:var(--c-yellow);
    border-color:var(--c-print);
  }
  .site-nav__cta{width:100%;padding:13px 18px;}

  .footer__bottom{flex-direction:column;align-items:flex-start;gap:8px;}
}

@media (max-width:640px){
  .footer__inner{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px;}
  .grid--2,.grid--3{grid-template-columns:1fr;}
  .to-top{width:46px;height:46px;font-size:18px;}
  .header__brand-sub{font-size:9px;letter-spacing:.05em;}
}

@media (max-width:420px){
  .header__mark{width:34px;height:34px;font-size:16px;}
  .header__brand-name{font-size:16px;}
  .header__brand-sub{display:none;}
  .lang-pill{padding:7px 10px;font-size:11px;gap:5px;}
  .nav-toggle{width:42px;height:42px;}
  .footer__inner{grid-template-columns:1fr;}
}

/* ==========================================================================
   降低动态效果
   ========================================================================== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .header__mark,
  .footer__mark,
  .lang-pill:hover,
  .btn:hover,
  .btn:active,
  .to-top{transform:none !important;}
}