/* ==========================================================================
   博猫注册 · entry-bomao.com.cn
   site.css — 共享外壳：reset / tokens / 侧轨页头 / 页脚 / 基础组件
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink:#071A2B;
  --ink-deep:#04121F;
  --panel:#0D2A40;
  --panel-2:#0F3350;
  --line:#123B52;
  --paper:#E8EEF4;
  --paper-dim:#C6D6E3;
  --muted:#9FB3C4;
  --gold:#F2C14E;
  --orange:#FF7A3D;
  --cyan:#5FD3C4;
  --teal:#0B3B3A;
  --wine:#5A1F2E;
  --indigo:#241A3D;

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

  --ease:cubic-bezier(0.2,0.8,0.2,1);
  --dur:180ms;
  --rail-width:288px;
  --shell-max:1180px;
  --shadow-hard:10px 10px 0 rgba(36,26,61,.55);
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    radial-gradient(55vw 45vh at 88% -8%, rgba(95,211,196,.09), transparent 62%),
    radial-gradient(48vw 40vh at 4% 106%, rgba(242,193,78,.06), transparent 68%);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dt,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video,canvas{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
table{border-collapse:collapse;width:100%}
::selection{background:var(--gold);color:var(--ink)}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}

/* ---------- 3. 中文排版基线 ---------- */
h1,h2,h3,h4{font-weight:900;letter-spacing:.06em;line-height:1.2}
h1{font-size:clamp(2.1rem,5vw,3.4rem)}
h2{font-size:clamp(1.7rem,3.4vw,2.4rem)}
h3{font-size:clamp(1.2rem,2vw,1.6rem);letter-spacing:.05em}
p{max-width:68ch}
strong{font-weight:900;color:var(--gold)}
small{font-size:13px;color:var(--muted)}

/* ---------- 4. 外壳布局 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:400;
  transform:translateY(-180%);
  display:inline-block;
  padding:10px 18px;
  background:var(--gold);color:var(--ink);
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.1em;
  border:2px solid var(--ink);box-shadow:5px 5px 0 rgba(4,18,31,.8);
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 5. 页头：移动端顶栏 ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;
  gap:14px;
  padding:11px 18px;
  background:linear-gradient(180deg,#0A2236 0%,#071A2B 100%);
  border-bottom:2px solid var(--line);
}
.rail-brand{min-width:0}
.brand-mark{display:inline-flex;align-items:center;gap:11px;min-width:0}
.brand-glyph{
  position:relative;flex:none;
  width:34px;height:23px;border-radius:50%;
  background:radial-gradient(circle at 50% 50%,var(--gold) 0 34%,#B9862C 62%,#5F4310 100%);
  box-shadow:0 0 0 2px var(--line),0 0 18px rgba(242,193,78,.35);
}
.brand-glyph::before,
.brand-glyph::after{
  content:"";position:absolute;top:24%;bottom:24%;width:3px;border-radius:2px;background:var(--ink);
}
.brand-glyph::before{left:calc(50% - 7px)}
.brand-glyph::after{left:calc(50% + 4px)}
.brand-text{display:flex;flex-direction:column;gap:1px;min-width:0;line-height:1.1}
.brand-name{
  font-size:18px;font-weight:900;letter-spacing:.22em;color:var(--paper);
  white-space:nowrap;
}
.brand-tagline{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.32em;
  color:var(--gold);white-space:nowrap;
}

.nav-toggle{
  display:inline-flex;align-items:center;gap:10px;
  padding:9px 13px;
  border:2px solid var(--line);
  background:rgba(13,42,64,.75);
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);background:rgba(15,51,80,.95)}
.nav-toggle-icon{position:relative;display:block;width:18px;height:12px}
.nav-toggle-bar{
  position:absolute;left:0;width:18px;height:2px;background:var(--gold);
  transition:transform var(--dur) var(--ease);
}
.nav-toggle-bar:nth-child(1){top:1px}
.nav-toggle-bar:nth-child(2){bottom:1px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){transform:translateY(-4px) rotate(-45deg)}
.nav-toggle-label{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--paper);
}

/* ---------- 6. 页头：导航抽屉（移动端） ---------- */
.site-nav{
  position:absolute;top:100%;left:0;right:0;
  display:flex;flex-direction:column;
  max-height:0;overflow:hidden;visibility:hidden;
  background:var(--panel);
  border-bottom:2px solid var(--line);
  box-shadow:0 20px 44px rgba(4,18,31,.65);
  transition:max-height 280ms var(--ease),visibility 0s linear 280ms;
}
.site-header[data-open] .site-nav{
  max-height:78vh;overflow-y:auto;visibility:visible;
  transition:max-height 280ms var(--ease),visibility 0s linear 0s;
}
.nav-list{display:flex;flex-direction:column;padding:4px 0}
.nav-item{border-bottom:1px dashed rgba(18,59,82,.85)}
.nav-item:last-child{border-bottom:0}
.nav-link{
  display:flex;align-items:baseline;gap:14px;
  padding:14px 22px;
  border-left:3px solid transparent;
  color:var(--paper-dim);
  font-size:15px;font-weight:700;letter-spacing:.14em;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.nav-index{
  font-family:var(--font-mono);font-size:11px;font-weight:400;letter-spacing:.06em;
  color:var(--muted);min-width:2ch;
  transition:color var(--dur) var(--ease);
}
.nav-label{line-height:1.2}
.nav-link:hover{
  background:var(--panel-2);color:var(--paper);
  border-left-color:var(--gold);transform:translateX(3px);
}
.nav-link:hover .nav-index{color:var(--gold)}
.nav-link[aria-current="page"]{
  color:var(--gold);
  border-left-color:var(--orange);
  background:linear-gradient(90deg,rgba(255,122,61,.20),rgba(255,122,61,0) 72%);
}
.nav-link[aria-current="page"] .nav-index{color:var(--orange)}

.rail-cta{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  margin:16px 20px 18px;padding:12px 15px;
  border:2px solid var(--orange);
  color:var(--paper);
  font-size:13.5px;font-weight:700;letter-spacing:.18em;
  box-shadow:5px 5px 0 rgba(255,122,61,.22);
  transition:background-color var(--dur) var(--ease),transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.rail-cta::after{content:"→";font-family:var(--font-mono);font-size:14px;color:var(--orange)}
.rail-cta:hover{
  background:rgba(255,122,61,.14);
  transform:translate(-1px,-2px);
  box-shadow:7px 7px 0 rgba(255,122,61,.26);
}
.rail-meta{display:none}

/* ---------- 7. 阅读进度轨 ---------- */
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-2px;height:3px;
  background:rgba(18,59,82,.9);
  pointer-events:none;z-index:3;
}
.scroll-progress-fill{
  display:block;width:100%;height:100%;
  transform:scaleX(var(--progress,0));
  transform-origin:left center;
  background:linear-gradient(90deg,var(--gold),var(--orange));
  transition:transform 120ms linear;
}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,110px);
  padding-top:clamp(34px,6vw,60px);
  background:linear-gradient(180deg,#061627 0%,#04121F 100%);
  border-top:2px solid var(--line);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;
  width:min(360px,62%);height:6px;
  background:linear-gradient(90deg,var(--gold),var(--orange) 55%,rgba(255,122,61,0));
}
.footer-top,
.footer-grid,
.footer-bottom{
  width:100%;max-width:var(--shell-max);margin-inline:auto;
  padding-inline:clamp(18px,4vw,48px);
}
.footer-top{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:18px;
  padding-bottom:clamp(22px,4vw,34px);
  border-bottom:2px solid var(--line);
}
.footer-brand{display:inline-flex;align-items:center;gap:14px}
.footer-glyph{
  position:relative;flex:none;
  width:30px;height:42px;
  border:2px solid var(--gold);border-bottom:0;
  background:linear-gradient(180deg,rgba(242,193,78,.26),rgba(242,193,78,0) 72%);
  box-shadow:inset 0 -18px 22px -14px rgba(255,122,61,.55);
}
.footer-glyph::after{
  content:"";position:absolute;right:5px;bottom:9px;
  width:3px;height:3px;border-radius:50%;background:var(--orange);
}
.footer-wordmark{
  font-size:clamp(1.35rem,3vw,1.9rem);font-weight:900;letter-spacing:.2em;
  color:var(--paper);line-height:1;
}
.footer-note{
  max-width:36ch;
  font-family:var(--font-mono);font-size:12px;line-height:1.9;letter-spacing:.06em;
  color:var(--muted);
}
.footer-grid{
  display:grid;grid-template-columns:1fr;gap:clamp(24px,4vw,40px);
  padding-block:clamp(26px,5vw,42px);
}
.footer-col{display:flex;flex-direction:column;gap:14px;min-width:0}
.footer-col-title{
  font-family:var(--font-mono);font-size:11px;font-weight:700;
  letter-spacing:.3em;color:var(--gold);text-transform:uppercase;
}
.footer-col-title::before{content:"//";margin-right:8px;letter-spacing:0;color:var(--orange)}
.footer-list{display:grid;gap:10px}
.footer-link{
  display:inline-flex;align-items:center;gap:8px;width:fit-content;
  padding:2px 0;
  font-size:15px;color:var(--paper-dim);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer-link:hover{color:var(--gold);border-bottom-color:var(--gold);transform:translateX(3px)}
.footer-contact-list{display:grid;gap:14px}
.footer-contact-item{display:grid;gap:2px;min-width:0}
.footer-label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--muted);
}
.footer-value{font-size:15px;color:var(--paper);letter-spacing:.02em;word-break:break-word}
.footer-value--mono{font-family:var(--font-mono);font-size:14px}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
  padding-block:18px 26px;
  border-top:2px solid var(--line);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--muted);
}
.footer-copy{margin:0;max-width:none}
.footer-legal{display:inline-flex;flex-wrap:wrap;align-items:center;gap:10px 14px;margin:0;max-width:none}
.footer-icp{
  padding:2px 8px;border:1px solid var(--line);color:var(--paper-dim);
}
.footer-hours{color:var(--muted)}

/* ---------- 9. 通用布局与排版组件 ---------- */
.container{
  width:100%;max-width:var(--shell-max);margin-inline:auto;
  padding-inline:clamp(18px,4vw,48px);
}
.section{padding-block:clamp(44px,7vw,92px);position:relative}
.eyebrow{
  display:flex;align-items:center;gap:12px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.28em;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:28px;height:2px;background:var(--cyan);flex:none}
.display-title{
  font-size:clamp(2.2rem,6vw,4rem);
  font-weight:900;letter-spacing:.06em;line-height:1.08;
}
.lede{
  max-width:60ch;
  font-size:clamp(1rem,1.6vw,1.12rem);
  line-height:1.9;color:var(--paper-dim);
}
.mono{font-family:var(--font-mono);letter-spacing:.08em}
.rule{border:0;height:2px;background:var(--line);margin-block:clamp(24px,4vw,48px)}
.stack{display:grid;gap:var(--stack-gap,1.25rem)}
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:1fr}
.grid--3{grid-template-columns:1fr}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.visually-hidden{
  position:absolute;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;
}

/* ---------- 10. 面板 / 卡片 ---------- */
.panel{
  background:var(--panel);
  border:2px solid var(--line);
  box-shadow:var(--shadow-hard);
  padding:clamp(20px,3vw,32px);
  min-width:0;
}
.card{
  display:block;
  background:var(--panel);
  border:2px solid var(--line);
  box-shadow:var(--shadow-hard);
  padding:clamp(20px,3vw,32px);
  min-width:0;
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.card:hover,.card:focus-visible{
  transform:translateY(-4px);
  box-shadow:14px 14px 0 rgba(36,26,61,.6);
  border-color:var(--gold);
}

/* ---------- 11. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:12px;
  padding:13px 22px;
  border:2px solid var(--line);
  background:transparent;color:var(--paper);
  font-size:14px;font-weight:700;letter-spacing:.14em;
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),color var(--dur) var(--ease);
}
.btn::after{content:"→";font-family:var(--font-mono);font-size:14px;letter-spacing:0}
.btn:hover{transform:translate(-1px,-2px)}
.btn--primary{
  border-color:var(--orange);color:var(--paper);
  background:linear-gradient(120deg,rgba(255,122,61,.18),rgba(255,122,61,0) 78%);
  box-shadow:5px 5px 0 rgba(255,122,61,.24);
}
.btn--primary::after{color:var(--orange)}
.btn--primary:hover{
  background:rgba(255,122,61,.2);box-shadow:8px 8px 0 rgba(255,122,61,.28);
}
.btn--ghost{border-color:var(--line);color:var(--paper-dim)}
.btn--ghost::after{color:var(--gold)}
.btn--ghost:hover{border-color:var(--gold);color:var(--paper);background:rgba(242,193,78,.08);box-shadow:6px 6px 0 rgba(36,26,61,.5)}

/* ---------- 12. 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;
  border:2px solid var(--line);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--muted);white-space:nowrap;
}
.tag--new{border-color:var(--cyan);color:var(--cyan);background:rgba(95,211,196,.08)}
.tag--old{border-color:var(--wine);color:#E3AEB9;background:rgba(90,31,46,.3)}
.tag--gold{border-color:var(--gold);color:var(--gold);background:rgba(242,193,78,.08)}

/* ---------- 13. 面包屑 ---------- */
.breadcrumb{padding-block:18px 0}
.breadcrumb-list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--muted);
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb-item::after{content:"/";color:var(--line)}
.breadcrumb-item:last-child::after{content:""}
.breadcrumb-item a{color:var(--muted);border-bottom:1px solid transparent;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease)}
.breadcrumb-item a:hover{color:var(--gold);border-bottom-color:var(--gold)}
.breadcrumb-item[aria-current="page"]{color:var(--gold)}

/* ---------- 14. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:var(--media-ratio,16 / 10);
  border:2px solid var(--line);
  background:
    radial-gradient(120% 90% at 20% 0%,rgba(95,211,196,.16),transparent 55%),
    radial-gradient(90% 80% at 88% 100%,rgba(242,193,78,.16),transparent 60%),
    linear-gradient(150deg,var(--panel) 0%,#071A2B 58%,var(--indigo) 100%);
  box-shadow:var(--shadow-hard);
}
.media-frame img,
.media-frame picture,
.media-fill{
  width:100%;height:100%;object-fit:cover;display:block;
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(200deg,rgba(95,211,196,.14),transparent 44%,rgba(7,26,43,.55));
}
.media-frame--wide{--media-ratio:21 / 9}
.media-frame--tall{--media-ratio:4 / 5}
.media-frame--gold{border-color:var(--gold);box-shadow:10px 10px 0 rgba(242,193,78,.24)}
.media-caption{
  margin-top:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted);
}

/* ---------- 15. 平板 ---------- */
@media (min-width:640px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .brand-name{font-size:19px}
}

/* ---------- 16. 桌面：左侧轨道 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail-width)}

  .site-header{
    position:fixed;top:0;left:0;bottom:0;
    width:var(--rail-width);
    display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;
    gap:0;padding:0 0 18px;
    border-bottom:0;border-right:2px solid var(--line);
    background:linear-gradient(180deg,#0A2236 0%,#071A2B 58%,#061627 100%);
    overflow-y:auto;overscroll-behavior:contain;
  }
  .site-header::before{
    content:"";position:absolute;top:0;left:0;width:100%;height:132px;
    background:linear-gradient(158deg,rgba(242,193,78,.18),rgba(255,122,61,.07) 46%,transparent 72%);
    clip-path:polygon(0 0,100% 0,100% 58%,0 100%);
    pointer-events:none;
  }
  .rail-brand{
    position:relative;z-index:1;
    padding:28px 22px 20px;
    border-bottom:1px solid var(--line);
  }
  .brand-name{font-size:21px}
  .brand-glyph{width:38px;height:26px}

  .nav-toggle{display:none}

  .site-nav{
    position:static;
    flex:1 1 auto;
    max-height:none;overflow:visible;visibility:visible;
    background:none;border:0;box-shadow:none;
    transition:none;
    padding-top:10px;
  }
  .nav-item{border-bottom:0}
  .nav-link{padding:13px 22px;font-size:15px;letter-spacing:.16em}
  .nav-label{white-space:nowrap}
  .rail-cta{margin:16px 20px 0}
  .rail-meta{
    display:block;
    margin:auto 20px 0;padding-top:16px;
    border-top:1px solid var(--line);
    font-family:var(--font-mono);font-size:11px;line-height:1.9;
    letter-spacing:.14em;color:var(--muted);
  }

  .scroll-progress{
    position:fixed;top:0;bottom:0;left:calc(var(--rail-width) - 3px);right:auto;
    width:3px;height:auto;
    background:rgba(18,59,82,.85);
  }
  .scroll-progress-fill{
    width:100%;height:100%;
    transform:scaleY(var(--progress,0));
    transform-origin:center top;
    transition:transform 120ms linear;
  }

  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1.05fr 1.05fr 1.35fr}
  .footer-wordmark{font-size:1.9rem}
}

/* ---------- 17. 大桌面 ---------- */
@media (min-width:1440px){
  :root{--rail-width:304px}
  .display-title{font-size:clamp(3rem,5vw,4.4rem)}
}

/* ---------- 18. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0s !important;
    scroll-behavior:auto !important;
  }
  .nav-link:hover,.footer-link:hover,.card:hover,.card:focus-visible,
  .btn:hover,.rail-cta:hover{transform:none}
}