/* =========================================================
   博王品牌站 · 共享样式 /assets/site.css
   ========================================================= */

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

/* ---------- 2 变量 ---------- */
:root{
  --c-lake:#0B6E8F;
  --c-deep:#08475C;
  --c-red:#B02A25;
  --c-wine:#7C1F2B;
  --c-gold:#D9A227;
  --c-snow:#FBFCFD;
  --c-mist:#E4EBEF;
  --c-ink:#14202E;
  --c-moss:#2F7A6B;

  --ink-80:rgba(20,32,46,.82);
  --ink-60:rgba(20,32,46,.64);
  --ink-40:rgba(20,32,46,.44);
  --line:rgba(8,71,92,.16);
  --line-soft:rgba(8,71,92,.09);
  --on-deep:rgba(251,252,253,.78);

  --font-body:"PingFang SC","Noto Sans SC","Source Han Sans SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-head:var(--font-body);
  --font-mono:ui-monospace,"SFMono-Regular","JetBrains Mono",Menlo,Consolas,"Courier New",monospace;

  --fs-12:0.75rem;
  --fs-13:0.8125rem;
  --fs-14:0.875rem;
  --fs-16:1rem;
  --fs-18:1.125rem;
  --fs-24:1.5rem;
  --fs-32:2rem;
  --fs-40:2.5rem;

  --r-sm:12px;
  --r-card:22px;
  --r-lg:28px;
  --r-pill:999px;

  --shell:1200px;
  --pad:clamp(16px,4vw,28px);

  --shadow-card:0 26px 46px -32px rgba(8,71,92,.5);
  --shadow-pill:0 10px 30px -18px rgba(8,71,92,.5);

  --ease:cubic-bezier(.2,.7,.3,1);
  --dur:.28s;
}

/* ---------- 3 基础排版 ---------- */
body{
  background:var(--c-snow);
  color:var(--c-ink);
  font-family:var(--font-body);
  font-size:var(--fs-16);
  line-height:1.75;
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
h1,h2,h3,h4,h5{
  font-family:var(--font-head);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.2;
  color:var(--c-ink);
}
.title-xl{font-size:clamp(1.875rem,5vw,var(--fs-40))}
.title-lg{font-size:clamp(1.5rem,3.4vw,var(--fs-32))}
.title-md{font-size:var(--fs-24)}
.title-sm{font-size:var(--fs-18)}
.lede{font-size:var(--fs-18);line-height:1.7;color:var(--ink-60);max-width:46em}
.muted{color:var(--ink-60)}
.small{font-size:var(--fs-13)}
.mono{font-family:var(--font-mono);letter-spacing:.04em}
.data-num{
  font-family:var(--font-mono);
  letter-spacing:.04em;
  color:var(--c-deep);
  border-bottom:2px solid var(--c-gold);
  padding-bottom:1px;
}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
:focus-visible{outline:3px solid var(--c-gold);outline-offset:3px;border-radius:8px}
:where([id]){scroll-margin-top:112px}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
    scroll-behavior:auto!important;
  }
}

/* ---------- 4 布局工具 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--pad)}
.section{padding:clamp(56px,9vw,104px) 0}
.section-tight{padding:clamp(36px,6vw,64px) 0}
.grid{display:grid;gap:clamp(16px,2.4vw,24px)}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.stack>*+*{margin-top:14px}
.prose{max-width:680px}
.prose p+p{margin-top:1em}

/* ---------- 5 跳转链接 ---------- */
.skip-link{
  position:absolute;left:16px;top:-80px;z-index:200;
  display:inline-block;padding:11px 20px;border-radius:var(--r-pill);
  background:var(--c-deep);color:var(--c-snow);
  font-size:var(--fs-14);font-weight:700;letter-spacing:.02em;
  box-shadow:var(--shadow-pill);
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:14px}

/* ---------- 6 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  padding:16px 0 10px;
  background:linear-gradient(to bottom,rgba(251,252,253,.97) 34%,rgba(251,252,253,0));
  transition:padding .3s var(--ease);
}
.site-header[data-scrolled]{padding:8px 0 6px}

.header-inner{
  position:relative;
  display:flex;align-items:center;
  gap:clamp(10px,1.6vw,22px);
  min-height:64px;
  padding:8px 10px 8px 14px;
  background:rgba(251,252,253,.9);
  border:1px solid var(--line);
  border-radius:var(--r-pill);
  box-shadow:var(--shadow-pill);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  transition:min-height .3s var(--ease),background-color .3s var(--ease);
}
.site-header[data-scrolled] .header-inner{
  min-height:54px;
  background:rgba(251,252,253,.97);
}

.brand{
  display:flex;align-items:center;gap:10px;flex:0 0 auto;
  padding:4px 6px 4px 4px;border-radius:var(--r-pill);
}
.brand-mark{
  width:38px;height:38px;flex:0 0 auto;
  display:grid;place-items:center;
  border-radius:13px;
  background:linear-gradient(140deg,var(--c-lake),var(--c-deep));
  color:var(--c-snow);
  font-size:var(--fs-18);font-weight:800;letter-spacing:-.02em;
  box-shadow:inset 0 -2px 0 rgba(217,162,39,.6);
}
.brand-text{display:flex;flex-direction:column;line-height:1.18;min-width:0}
.brand-name{font-size:var(--fs-18);font-weight:800;letter-spacing:-.02em;color:var(--c-ink)}
.brand-tagline{font-size:var(--fs-12);color:var(--ink-40);white-space:nowrap}

.nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-list a{
  display:block;padding:9px 14px;border-radius:var(--r-pill);
  font-size:var(--fs-14);font-weight:600;color:var(--ink-60);
  white-space:nowrap;
  transition:background-color .22s var(--ease),color .22s var(--ease),transform .22s var(--ease);
}
.nav-list a:hover{background:var(--c-mist);color:var(--c-deep)}
.nav-list a[aria-current="page"]{
  background:var(--c-red);color:#fff;transform:scale(1.04);
  box-shadow:0 10px 20px -14px rgba(176,42,37,.95);
}

.subscribe-pill{
  display:inline-flex;align-items:center;gap:8px;flex:0 0 auto;
  padding:9px 12px 9px 16px;border-radius:var(--r-pill);
  background:var(--c-deep);color:var(--c-snow);
  font-size:var(--fs-13);font-weight:700;
  transition:background-color .24s var(--ease),transform .24s var(--ease);
}
.subscribe-pill:hover{background:var(--c-lake);transform:translateY(-1px)}
.count-badge{
  min-width:24px;height:24px;padding:0 7px;border-radius:var(--r-pill);
  display:inline-grid;place-items:center;
  background:var(--c-red);color:#fff;
  font-family:var(--font-mono);font-size:var(--fs-12);letter-spacing:.04em;
}

.nav-toggle{
  display:none;align-items:center;gap:9px;flex:0 0 auto;
  padding:9px 15px;border-radius:var(--r-pill);
  border:1px solid var(--line);background:var(--c-mist);
  color:var(--c-deep);
  font-size:var(--fs-13);font-weight:700;
}
.nav-toggle-icon{display:flex;flex-direction:column;justify-content:center;gap:4px;width:16px;height:14px}
.nav-toggle-bar{
  display:block;width:16px;height:2px;border-radius:2px;
  background:var(--c-deep);
  transition:transform .24s var(--ease);
}
[data-nav-toggle][aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(3px) rotate(45deg)}
[data-nav-toggle][aria-expanded="true"] .nav-toggle-bar:nth-child(2){transform:translateY(-3px) rotate(-45deg)}

/* ---------- 7 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 24px;border-radius:var(--r-pill);
  border:1px solid transparent;
  font-size:var(--fs-14);font-weight:700;letter-spacing:.01em;
  transition:transform .22s var(--ease),background-color .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--c-lake);color:#fff}
.btn-primary:hover{background:var(--c-deep)}
.btn-accent{background:var(--c-red);color:#fff}
.btn-accent:hover{background:var(--c-wine)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--c-deep)}
.btn-ghost:hover{background:var(--c-mist);border-color:var(--c-lake)}
.btn-gold{background:var(--c-gold);color:var(--c-ink)}
.btn-gold:hover{background:#c48f18}

/* ---------- 8 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:var(--fs-13);color:var(--ink-40);
}
.breadcrumb a{color:var(--ink-60);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--c-lake)}
.breadcrumb-sep{color:var(--line);font-family:var(--font-mono)}

/* ---------- 9 卡片 / 标签 / 章节编号 ---------- */
.card{
  position:relative;
  padding:26px 24px;
  background:var(--c-snow);
  border:1px solid var(--line-soft);
  border-radius:var(--r-card);
  transition:transform .26s var(--ease),box-shadow .26s var(--ease),border-color .26s var(--ease);
}
.card:hover{
  transform:translateY(-4px);
  border-color:var(--c-wine);
  box-shadow:var(--shadow-card);
}
.card-grid{display:grid;gap:clamp(16px,2.4vw,22px);grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:var(--r-pill);
  background:var(--c-mist);color:var(--c-deep);
  font-size:var(--fs-12);font-weight:700;line-height:1.6;
  white-space:nowrap;
}
.tag-red{background:rgba(176,42,37,.12);color:var(--c-red)}
.tag-gold{background:rgba(217,162,39,.18);color:#7d5a0c}
.tag-wine{background:rgba(124,31,43,.12);color:var(--c-wine)}
.tag-moss{background:rgba(47,122,107,.14);color:var(--c-moss)}
.tag-mono{font-family:var(--font-mono);letter-spacing:.04em}

.section-num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(2.25rem,6vw,4.25rem);
  font-weight:700;
  line-height:1;
  letter-spacing:-.04em;
  color:var(--c-lake);
  opacity:.24;
  margin-bottom:6px;
}

/* ---------- 10 图片容器 ---------- */
.figure{display:block;margin:0}
.figure-media{
  position:relative;
  aspect-ratio:16/10;
  overflow:hidden;
  border-radius:var(--r-lg);
  background:linear-gradient(150deg,rgba(11,110,143,.16),rgba(217,162,39,.12)),var(--c-mist);
  isolation:isolate;
}
.figure-media>img,
.figure-media>svg,
.figure-media>picture>img{
  width:100%;height:100%;object-fit:cover;object-position:center;
}
.figure-media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(20,32,46,.4) 1px,transparent 1px);
  background-size:6px 6px;
  opacity:.05;
}
.figure-caption{margin-top:10px;font-size:var(--fs-13);color:var(--ink-40);line-height:1.7}
.figure-square .figure-media{aspect-ratio:1/1}
.figure-tall .figure-media{aspect-ratio:4/5}
.figure-wide .figure-media{aspect-ratio:21/9}
.figure-media-map{
  background:
    linear-gradient(150deg,rgba(8,71,92,.9),rgba(11,110,143,.7)),
    var(--c-deep);
}
@media (max-width:640px){
  .figure-media,.figure-square .figure-media{aspect-ratio:4/3}
  .figure-tall .figure-media{aspect-ratio:3/4}
  .figure-wide .figure-media{aspect-ratio:16/9}
}

/* ---------- 11 滚动显现 ---------- */
html[data-js] [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .36s var(--ease),transform .36s var(--ease);
}
html[data-js] [data-reveal][data-shown]{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html[data-js] [data-reveal]{opacity:1;transform:none}
}

/* ---------- 12 章节跟随 ---------- */
[data-spy-link]{
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
[data-spy-link][data-current]{
  color:var(--c-red);
  border-color:var(--c-red);
  font-weight:700;
}

/* ---------- 13 返回顶部 ---------- */
.backtop{
  position:fixed;right:20px;bottom:22px;z-index:80;
  width:54px;height:54px;border-radius:50%;
  display:grid;place-items:center;
  background:conic-gradient(var(--c-gold) calc(var(--p,0) * 1%),rgba(8,71,92,.18) 0);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s linear;
}
.backtop[data-visible]{opacity:1;visibility:visible;transform:none}
.backtop::before{
  content:"";position:absolute;inset:3px;border-radius:50%;
  background:var(--c-deep);
  transition:background-color .2s var(--ease);
}
.backtop:hover::before{background:var(--c-lake)}
.backtop-icon{
  position:relative;z-index:1;
  width:12px;height:12px;
  border-left:2px solid var(--c-snow);
  border-top:2px solid var(--c-snow);
  transform:rotate(45deg) translate(2px,2px);
}

/* ---------- 14 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,10vw,104px);
  padding:clamp(48px,7vw,72px) 0 26px;
  border-radius:36px 36px 0 0;
  overflow:hidden;
  color:var(--c-snow);
  background:
    radial-gradient(120% 90% at 100% 0%,rgba(11,110,143,.62) 0%,rgba(8,71,92,0) 58%),
    radial-gradient(90% 70% at 0% 100%,rgba(176,42,37,.28) 0%,rgba(8,71,92,0) 60%),
    var(--c-deep);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(rgba(251,252,253,.5) 1px,transparent 1px);
  background-size:5px 5px;
  opacity:.04;
}
.footer-grid{
  position:relative;z-index:1;
  display:grid;
  grid-template-columns:minmax(230px,1.5fr) repeat(3,minmax(112px,.85fr)) minmax(240px,1.3fr);
  gap:clamp(24px,3.2vw,38px);
}
.footer-mark{
  display:grid;place-items:center;
  width:44px;height:44px;margin-bottom:12px;
  border-radius:14px;
  background:linear-gradient(140deg,var(--c-gold),#b9820f);
  color:var(--c-deep);
  font-size:var(--fs-18);font-weight:800;
}
.footer-name{font-size:var(--fs-18);font-weight:800;letter-spacing:-.02em}
.footer-note{margin-top:8px;font-size:var(--fs-14);color:var(--on-deep);max-width:26em}
.footer-sub{
  margin-top:14px;
  display:inline-block;padding:6px 14px;border-radius:var(--r-pill);
  background:rgba(217,162,39,.16);
  color:var(--c-gold);
  font-size:var(--fs-12);font-weight:700;
}
.footer-col-title{
  margin-bottom:14px;
  font-size:var(--fs-13);font-weight:800;letter-spacing:.16em;
  color:var(--c-gold);
}
.footer-links a{
  display:inline-block;padding:5px 0;
  font-size:var(--fs-14);color:var(--on-deep);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.footer-links a:hover{color:#fff;border-color:var(--c-gold);transform:translateX(3px)}
.contact-list{
  display:grid;grid-template-columns:auto 1fr;gap:7px 14px;
  font-size:var(--fs-14);
}
.contact-list dt{color:var(--c-gold);font-weight:700}
.contact-list dd{color:var(--on-deep);word-break:break-word}
.footer-tip{
  margin-top:14px;padding-left:12px;
  border-left:2px solid rgba(217,162,39,.5);
  font-size:var(--fs-13);line-height:1.7;color:rgba(251,252,253,.6);
}
.footer-bottom{
  position:relative;z-index:1;
  margin-top:clamp(34px,5vw,54px);
  padding-top:20px;
  border-top:1px solid rgba(251,252,253,.16);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 24px;
  font-size:var(--fs-13);color:rgba(251,252,253,.58);
}
.footer-legal{font-family:var(--font-mono);letter-spacing:.04em}

/* ---------- 15 响应式 ---------- */
@media (max-width:1080px){
  .brand-tagline{display:none}
  .nav-toggle{display:inline-flex}

  .nav{
    position:absolute;
    top:calc(100% + 10px);
    left:0;right:0;
    margin-left:0;
    display:none;
    padding:12px;
    background:var(--c-snow);
    border:1px solid var(--line);
    border-radius:26px;
    box-shadow:0 30px 60px -34px rgba(8,71,92,.6);
  }
  .nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:4px}
  .nav-list a{
    padding:13px 16px;
    border-radius:16px;
    font-size:var(--fs-16);
    font-weight:700;
    color:var(--c-deep);
  }
  .nav-list a[aria-current="page"]{transform:none}

  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1/-1}
  .footer-contact{grid-column:1/-1}
}

@media (max-width:640px){
  :root{--r-lg:22px;--r-card:20px}
  .header-inner{padding:7px 8px 7px 10px;min-height:58px}
  .brand-mark{width:34px;height:34px;border-radius:11px;font-size:var(--fs-16)}
  .brand-name{font-size:var(--fs-16)}
  .subscribe-pill{padding:8px 9px 8px 13px}
  .footer-grid{grid-template-columns:1fr}
  .contact-list{grid-template-columns:1fr;gap:2px}
  .contact-list dt{margin-top:8px}
  .backtop{right:14px;bottom:16px;width:48px;height:48px}
}

@media (max-width:420px){
  .subscribe-pill-text{display:none}
  .nav-toggle-label{display:none}
  .nav-toggle{padding:10px 12px}
}