/* =========================================================
   BEPLAY 品牌站 · 共享样式 /assets/site.css
   设计语言：深墨蓝底 + 荧光青路径 + 暖橘节点 + 琥珀公告
   ========================================================= */

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

/* ---------- 2. Tokens ---------- */
:root{
  --ink-900:#0A1626;
  --ink-800:#0E2036;
  --ink-700:#132E4A;
  --teal-700:#17565E;
  --paper-100:#F3EDE1;
  --paper-300:#C9BEA8;
  --cyan-400:#3FE0CF;
  --orange-500:#FF8A3D;
  --amber-400:#F0B429;
  --mint-300:#9BD4BC;
  --slate-300:#9AAEC2;
  --text-body:#D9E3EE;

  --font-display:"Oswald","Barlow Semi Condensed","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;

  --step-0:16px; --step-1:20px; --step-2:28px; --step-3:40px; --step-4:64px; --step-5:96px;

  --radius-sm:10px;
  --radius-md:18px;
  --radius-lg:28px;
  --radius-pill:999px;

  --shell:1200px;
  --gutter:20px;
  --header-bar-h:64px;
  --ribbon-h:34px;
  --header-h:calc(var(--header-bar-h) + var(--ribbon-h));
  --shadow-deep:0 18px 44px rgba(0,0,0,.46);
}

@media (min-width:900px){
  :root{--header-bar-h:76px;--gutter:32px;}
}

/* ---------- 3. 中文排版基准 ---------- */
body{
  min-height:100vh;
  background:var(--ink-900);
  color:var(--text-body);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-body);
  font-weight:800;
  line-height:1.25;
  letter-spacing:-.01em;
  color:var(--paper-100);
}
h1{font-size:clamp(40px,7vw,96px)}
h2{font-size:clamp(28px,3.6vw,40px)}
h3{font-size:clamp(20px,2.2vw,28px)}
p{max-width:40em}
a{text-decoration:none}
strong{color:var(--paper-100)}
:focus-visible{outline:2px solid var(--orange-500);outline-offset:3px;border-radius:6px}

.shell{width:min(100% - 2 * var(--gutter),var(--shell));margin-inline:auto}
.site-main{display:block;padding-top:var(--header-h)}
.hero-bleed{margin-top:calc(-1 * var(--header-h))}

/* ---------- 4. 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:var(--radius-pill);
  border:1px solid transparent;cursor:pointer;
  font-family:var(--font-body);font-size:14px;font-weight:700;letter-spacing:.02em;
  transition:transform .22s ease,background-color .22s ease,color .22s ease,border-color .22s ease;
}
.btn-primary{background:var(--orange-500);border-color:var(--orange-500);color:#2A1200}
.btn-primary:hover{background:#FFA264;border-color:#FFA264;transform:translateY(-2px)}
.btn-ghost{background:rgba(63,224,207,.06);border-color:rgba(63,224,207,.55);color:var(--cyan-400)}
.btn-ghost:hover{background:rgba(63,224,207,.14);transform:translateY(-2px)}
.btn-quiet{background:rgba(154,174,194,.12);border-color:rgba(154,174,194,.28);color:var(--paper-100)}
.btn-quiet:hover{background:rgba(154,174,194,.2);transform:translateY(-2px)}

/* ---------- 5. 标签 / 坐标 / 章节 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 13px;border-radius:var(--radius-pill);
  font-size:13px;line-height:1.5;letter-spacing:.02em;
  background:rgba(154,174,194,.12);border:1px solid rgba(154,174,194,.3);color:var(--text-body);
}
.tag--mint{background:rgba(155,212,188,.14);border-color:rgba(155,212,188,.5);color:var(--mint-300)}
.tag--cyan{background:rgba(63,224,207,.12);border-color:rgba(63,224,207,.5);color:var(--cyan-400)}
.tag--amber{background:rgba(240,180,41,.14);border-color:rgba(240,180,41,.5);color:var(--amber-400)}
.tag--orange{background:rgba(255,138,61,.14);border-color:rgba(255,138,61,.5);color:var(--orange-500)}

.coord{
  display:inline-block;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--cyan-400);
}
.section{padding-block:clamp(40px,7vw,84px)}
.section-band{
  display:flex;align-items:center;gap:14px;
  padding-top:14px;margin-bottom:22px;
  border-top:1px solid rgba(154,174,194,.22);
}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:14px;margin-bottom:18px}
.section-title{font-size:clamp(24px,3vw,36px)}
.lede{font-size:17px;line-height:1.9;color:var(--slate-300);max-width:38em}

/* ---------- 6. 面板 / 旁注 / 正文 ---------- */
.panel{
  background:var(--ink-700);border:1px solid rgba(63,224,207,.2);
  border-radius:var(--radius-lg);padding:clamp(18px,3vw,32px);
}
.paper-panel{
  background:var(--paper-100);color:var(--ink-900);
  border-radius:var(--radius-lg);padding:clamp(20px,4vw,44px);
}
.paper-panel h2,.paper-panel h3,.paper-panel strong{color:var(--ink-900)}
.aside-note{
  border-left:3px solid var(--cyan-400);
  padding:4px 0 4px 14px;margin-block:18px;
  font-size:15px;color:var(--slate-300);max-width:34em;
}
.prose{max-width:40em;font-size:17px;line-height:1.85}
.prose p + p{margin-top:1em}
.prose h2,.prose h3{margin-top:1.6em;margin-bottom:.5em}
.prose ul,.prose ol{margin-block:1em;padding-left:1.2em;list-style:disc}
.prose a{color:var(--cyan-400);border-bottom:1px dashed rgba(63,224,207,.6)}
.paper-panel .prose,.paper-panel .prose p{color:var(--ink-900)}
.paper-panel .prose a{color:var(--teal-700);border-bottom-color:rgba(23,86,94,.6)}

/* ---------- 7. 网格 ---------- */
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}
.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-12{grid-column:span 12}

/* ---------- 8. 图框 / 路径装饰 ---------- */
.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:var(--frame-ratio,16 / 9);
  border-radius:var(--radius-lg);
  background:var(--ink-700);
  border:1px solid rgba(63,224,207,.22);
}
.media-frame > img,.media-frame > svg,.media-frame > video,.media-frame > picture img{
  width:100%;height:100%;object-fit:cover;
}
.media-frame--wide{--frame-ratio:21 / 9}
.media-frame--square{--frame-ratio:1 / 1}
.media-frame--tall{--frame-ratio:3 / 4}
.media-frame--paper{background:var(--paper-100);border-color:rgba(10,22,38,.14)}
.media-frame--route{
  background-image:
    linear-gradient(rgba(63,224,207,.10) 1px,transparent 1px),
    linear-gradient(90deg,rgba(63,224,207,.10) 1px,transparent 1px);
  background-size:36px 36px,36px 36px;
}
.media-frame__hint{
  position:absolute;left:14px;bottom:12px;
  padding:5px 10px;border-radius:var(--radius-pill);
  background:rgba(10,22,38,.74);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--cyan-400);
}
.divider-route{
  height:1px;border:0;margin-block:var(--step-2);
  background-image:linear-gradient(90deg,var(--cyan-400) 0 18px,transparent 18px 26px);
  background-size:26px 1px;background-repeat:repeat-x;opacity:.55;
}
.texture-noise{position:relative}
.texture-noise::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  border-radius:inherit;opacity:.4;
  background-image:radial-gradient(rgba(243,237,225,.10) 1px,transparent 1px);
  background-size:6px 6px;
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb{font-size:13px;color:var(--slate-300);margin-bottom:18px}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__list li{display:flex;align-items:center;gap:8px}
.breadcrumb__list li + li::before{
  content:"";width:14px;height:1px;background:var(--slate-300);opacity:.7;
}
.breadcrumb a{color:var(--slate-300);border-bottom:1px dashed rgba(154,174,194,.5)}
.breadcrumb a:hover{color:var(--cyan-400);border-bottom-color:var(--cyan-400)}
.breadcrumb [aria-current="page"]{color:var(--cyan-400)}

/* ---------- 10. 页头 ---------- */
.skip-link{
  position:fixed;left:14px;top:-70px;z-index:200;
  padding:10px 18px;border-radius:var(--radius-pill);
  background:var(--paper-100);color:var(--ink-900);
  font-weight:700;font-size:14px;
  transition:top .2s ease;
}
.skip-link:focus{top:12px}

.site-header{
  position:fixed;top:0;left:0;right:0;z-index:90;
  display:flex;flex-direction:column;
  background:transparent;
  border-bottom:1px solid rgba(63,224,207,.16);
  transition:background-color .32s ease,box-shadow .32s ease,border-color .32s ease;
}
.site-header[data-state="solid"]{
  background:rgba(10,22,38,.96);
  border-bottom-color:rgba(63,224,207,.38);
  box-shadow:0 12px 34px rgba(0,0,0,.5);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}
.header-inner{
  width:min(100% - 2 * var(--gutter),var(--shell));
  margin-inline:auto;
  display:flex;align-items:center;gap:16px;
  min-height:var(--header-bar-h);
}
.brand{display:inline-flex;align-items:center;gap:11px;flex:0 0 auto}
.brand-mark{
  position:relative;width:32px;height:32px;flex:0 0 auto;
  border:1.5px solid var(--cyan-400);border-radius:11px;
  background:linear-gradient(140deg,rgba(63,224,207,.2),rgba(19,46,74,.6));
}
.brand-mark::before,.brand-mark::after{content:"";position:absolute;border-radius:50%}
.brand-mark::before{width:7px;height:7px;left:5px;bottom:5px;background:var(--orange-500)}
.brand-mark::after{width:6px;height:6px;right:5px;top:5px;background:var(--mint-300)}
.brand-type{display:flex;flex-direction:column;line-height:1.2}
.brand-name{
  font-family:var(--font-display);font-size:18px;font-weight:700;
  letter-spacing:.16em;text-transform:uppercase;color:var(--paper-100);
}
.brand-sub{font-size:11px;letter-spacing:.2em;color:var(--slate-300)}

.primary-nav{margin-inline:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:9px 13px;border-radius:var(--radius-pill);
  font-size:15px;color:var(--paper-100);
  transition:color .2s ease,background-color .2s ease;
}
.nav-link:hover{color:var(--cyan-400);background:rgba(63,224,207,.1)}
.nav-index{font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;color:var(--slate-300)}
.nav-link[aria-current="page"]{color:var(--cyan-400);background:rgba(63,224,207,.1)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:13px;right:13px;bottom:4px;height:2px;
  border-radius:2px;background:var(--cyan-400);
}

.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 15px;border-radius:var(--radius-pill);
  background:rgba(63,224,207,.1);border:1px solid rgba(63,224,207,.42);
  color:var(--paper-100);font-size:13px;cursor:pointer;
}
.nav-toggle__bars{position:relative;width:16px;height:10px;flex:0 0 auto}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;
  background:var(--cyan-400);transition:transform .24s ease,top .24s ease;
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}

.route-ribbon{
  display:flex;align-items:center;gap:10px;
  height:var(--ribbon-h);padding-inline:var(--gutter);
  background:linear-gradient(90deg,rgba(240,180,41,.18),rgba(240,180,41,.04));
  border-top:1px solid rgba(240,180,41,.28);
  color:var(--amber-400);font-size:13px;line-height:1;
}
.route-ribbon__dot{
  width:7px;height:7px;border-radius:50%;background:var(--amber-400);flex:0 0 auto;
  box-shadow:0 0 0 4px rgba(240,180,41,.16);
  animation:pulse-dot 2.4s ease-in-out infinite;
}
@keyframes pulse-dot{0%,100%{opacity:1}50%{opacity:.45}}
.route-ribbon__text{
  max-width:none;font-size:13px;color:var(--amber-400);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.scroll-meter{
  position:absolute;left:0;bottom:0;height:2px;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan-400),var(--orange-500));
}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  position:relative;margin-top:var(--step-4);
  background:var(--ink-900);color:var(--slate-300);
  border-top:1px solid rgba(63,224,207,.26);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;width:min(240px,40%);height:3px;
  background:linear-gradient(90deg,var(--cyan-400),var(--orange-500));
}
.trace-bar{
  position:sticky;bottom:0;z-index:40;
  display:flex;align-items:center;flex-wrap:wrap;gap:12px;
  width:min(100% - 2 * var(--gutter),var(--shell));
  margin:0 auto;padding:10px 18px;
  background:linear-gradient(90deg,rgba(19,46,74,.98),rgba(10,22,38,.98));
  border:1px solid rgba(63,224,207,.34);
  border-radius:var(--radius-pill);
  box-shadow:var(--shadow-deep);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  transform:translateY(-14px);
}
.trace-bar__label{
  padding-right:12px;border-right:1px solid rgba(154,174,194,.32);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--amber-400);
}
.trace-bar__list{display:flex;flex-wrap:wrap;gap:6px}
.trace-bar__list a{
  display:inline-block;padding:6px 13px;border-radius:var(--radius-pill);
  background:rgba(63,224,207,.1);color:var(--paper-100);font-size:13px;
  transition:background-color .2s ease,color .2s ease;
}
.trace-bar__list a:hover{background:var(--cyan-400);color:var(--ink-900)}
.trace-bar__note{margin-left:auto;font-size:12px;color:var(--slate-300)}

.footer-inner{
  width:min(100% - 2 * var(--gutter),var(--shell));
  margin-inline:auto;
  display:grid;grid-template-columns:1fr;gap:32px;
  padding:var(--step-3) 0 var(--step-2);
}
.footer-brand{display:flex;flex-direction:column;gap:12px}
.brand--footer .brand-name{font-size:17px}
.footer-brand__line{font-size:14px;color:var(--cyan-400);letter-spacing:.04em}
.footer-brand__note{font-size:13px;line-height:1.8;color:var(--slate-300);max-width:30em}
.footer-cols{display:grid;grid-template-columns:1fr;gap:26px}
.footer-col__title{
  display:flex;align-items:baseline;gap:8px;margin-bottom:12px;
  font-size:14px;font-weight:800;color:var(--paper-100);
}
.footer-col__en{
  font-family:var(--font-mono);font-size:10px;font-weight:400;
  letter-spacing:.18em;text-transform:uppercase;color:var(--mint-300);
}
.footer-list{display:grid;gap:4px}
.footer-list a{
  display:inline-block;padding:5px 0;font-size:14px;color:var(--text-body);
  transition:color .2s ease,transform .2s ease;
}
.footer-list a:hover{color:var(--cyan-400);transform:translateX(4px)}
.footer-contact{display:grid;gap:10px}
.footer-line{font-size:13px;line-height:1.75;color:var(--text-body);max-width:26em}
.footer-line__key{
  display:block;margin-bottom:2px;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--slate-300);
}
.footer-bottom{
  width:min(100% - 2 * var(--gutter),var(--shell));
  margin-inline:auto;
  display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between;
  padding:18px 0 var(--step-2);
  border-top:1px solid rgba(154,174,194,.18);
}
.footer-legal{font-size:12px;line-height:1.8;color:var(--slate-300);max-width:56em}
.footer-legal--muted{opacity:.82}

/* ---------- 12. 显现动效协议 ---------- */
.has-js [data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .55s ease,transform .55s ease;
  transition-delay:var(--reveal-delay,0ms);
}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 13. 断点 ---------- */
@media (min-width:760px){
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (min-width:1000px){
  .footer-inner{grid-template-columns:1.1fr 2fr;gap:48px;padding-block:var(--step-4) var(--step-3)}
}
@media (max-width:1100px){
  .header-cta{display:none}
}
@media (max-width:1024px){
  .grid{grid-template-columns:repeat(6,minmax(0,1fr));gap:20px}
  .col-3,.col-4,.col-5{grid-column:span 3}
  .col-6,.col-7,.col-8{grid-column:span 6}
}
@media (max-width:980px){
  .primary-nav{
    position:fixed;
    top:var(--header-h);left:0;right:0;
    display:none;
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    padding:12px var(--gutter) 24px;
    background:var(--ink-900);
    border-top:1px solid rgba(63,224,207,.2);
    border-bottom:1px solid rgba(63,224,207,.34);
    box-shadow:var(--shadow-deep);
  }
  .primary-nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{
    width:100%;padding:14px 12px;border-radius:var(--radius-md);
    font-size:17px;border-bottom:1px solid rgba(154,174,194,.16);
  }
  .nav-link[aria-current="page"]::after{display:none}
  .nav-toggle{display:inline-flex}
}
@media (max-width:760px){
  .trace-bar{border-radius:var(--radius-lg);justify-content:center;transform:translateY(-10px)}
  .trace-bar__note{margin-left:0;width:100%;text-align:center}
  .trace-bar__label{border-right:0;padding-right:0;width:100%;text-align:center}
  .footer-legal{max-width:none}
}
@media (max-width:680px){
  .grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-12{grid-column:span 4}
  body{font-size:16px}
}

/* ---------- 14. 无障碍与动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none;transition:none}
  .scroll-meter{display:none}
}