/* ==========================================================================
   博鱼官方站 · 共享样式 /assets/site.css
   变量 → 重置 → 排版 → 容器网格 → 按钮 → 组件 → 头部 → 页脚 → 响应式 → 动效降级
   ========================================================================== */

:root{
  --navy-900:#061A2B;
  --navy-800:#0B3355;
  --navy-600:#17557F;
  --blue-400:#3E8FB0;
  --teal:#2FBFA6;
  --coral:#FF6B3D;
  --coral-soft:#FFA684;
  --paper:#F5F8FA;
  --mist:#E3EBF1;
  --ink:#0D151C;
  --grid-line:rgba(62,143,176,.30);
  --line-dark:rgba(62,143,176,.42);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC","Heiti SC","WenQuanYi Micro Hei",sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular","SF Mono",Consolas,"Liberation Mono","Courier New",monospace;
  --header-h:56px;
  --shell:1240px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --t-fast:.14s;
  --t-base:.18s;
}

*,
*::before,
*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 16px);
}

body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--ink);
  background:var(--paper);
  font-synthesis-weight:none;
  -webkit-font-smoothing:antialiased;
}

body,
h1,h2,h3,h4,h5,h6,
p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img,svg{display:block;max-width:100%;}
a{color:inherit;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;}
table{border-collapse:collapse;width:100%;}

:focus-visible{outline:2px solid var(--coral);outline-offset:2px;}

/* ---------- 排版 ---------- */
h1,h2,h3,h4,h5,h6{
  font-weight:900;
  line-height:1.06;
  letter-spacing:-.02em;
  text-wrap:balance;
}
h1{font-size:clamp(34px,5.6vw,76px);}
h2{font-size:clamp(26px,3.4vw,46px);}
h3{font-size:clamp(18px,1.7vw,24px);line-height:1.28;letter-spacing:-.01em;}
h4{font-size:16px;line-height:1.4;letter-spacing:0;}
p{line-height:1.75;}
strong,b{font-weight:700;}
small{font-size:12.5px;}

.prose p{max-width:36em;}
.prose p + p{margin-top:1em;}
.prose h2{margin:1.5em 0 .6em;}
.prose h3{margin:1.4em 0 .5em;}
.prose ul{list-style:disc;padding-left:1.2em;max-width:36em;}
.prose li + li{margin-top:.4em;}

/* ---------- 容器与栅格 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding:0 clamp(16px,4vw,48px);
}
.page-body{padding-block:clamp(32px,5vw,68px);}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2.2vw,32px);
}
.rule{height:1px;border:0;background:var(--grid-line);margin-block:clamp(24px,3vw,40px);}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 文字标记 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--navy-600);
}
.eyebrow::before{content:"";width:20px;height:1px;background:var(--coral);flex:none;}
.eyebrow--inverse{color:rgba(245,248,250,.72);}

.mono{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  font-variant-numeric:tabular-nums;
}

.status-dot{
  display:inline-block;width:7px;height:7px;
  background:var(--teal);
  box-shadow:0 0 0 3px rgba(47,191,166,.18);
  flex:none;
}

.rail-note{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.3em;
  color:var(--blue-400);
}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;
  border:1px solid var(--mist);
  background:var(--paper);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--navy-600);
  cursor:pointer;
  transition:background-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.tag:hover{border-color:var(--coral);color:var(--coral);}
.tag.is-active,
.tag[aria-pressed="true"]{
  background:var(--navy-800);
  border-color:var(--navy-800);
  color:var(--paper);
}

.result-count{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.1em;
  color:var(--navy-600);
}
.result-count b{color:var(--coral);font-weight:500;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;
  border:1px solid transparent;
  border-radius:0;
  font-size:13px;font-weight:700;letter-spacing:.08em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color var(--t-fast) var(--ease),
             color var(--t-fast) var(--ease),
             border-color var(--t-fast) var(--ease),
             transform var(--t-fast) var(--ease);
}
.btn:active{transform:translateY(1px);}
.btn-accent{background:var(--coral);color:var(--navy-900);}
.btn-accent:hover{background:var(--coral-soft);}
.btn-ghost{background:transparent;color:var(--paper);border-color:rgba(245,248,250,.40);}
.btn-ghost:hover{border-color:var(--coral);color:var(--coral-soft);}
.btn-dark{background:var(--navy-800);color:var(--paper);}
.btn-dark:hover{background:var(--navy-600);}
.btn-line{background:transparent;color:var(--navy-800);border-color:var(--blue-400);}
.btn-line:hover{border-color:var(--coral);color:var(--coral);}

/* ---------- 卡片与视觉容器 ---------- */
.card{
  position:relative;
  background:#fff;
  border:1px solid var(--mist);
  padding:clamp(18px,2vw,26px);
  transition:transform var(--t-base) var(--ease),
             border-color var(--t-base) var(--ease),
             box-shadow var(--t-base) var(--ease);
}
.card:hover{
  transform:translateY(-2px);
  border-color:var(--coral);
  box-shadow:0 14px 30px -24px rgba(11,51,85,.6);
}
.card--dark{
  background:var(--navy-800);
  color:var(--paper);
  border-color:var(--line-dark);
}

.media{
  position:relative;
  display:block;
  overflow:hidden;
  border:1px solid var(--line-dark);
  background:
    linear-gradient(135deg,var(--navy-800) 0%,var(--navy-600) 52%,var(--blue-400) 100%);
  background-size:cover;
}
.media img{
  width:100%;height:100%;
  object-fit:cover;
  transition:transform var(--t-base) ease-out;
}
.media:hover img{transform:scale(1.03);}
.media--16x9{aspect-ratio:16/9;}
.media--4x3{aspect-ratio:4/3;}
.media--1x1{aspect-ratio:1/1;}
.media--wide{aspect-ratio:21/9;}
.media-caption{
  position:absolute;left:0;bottom:0;
  padding:6px 10px;
  background: rgba(6,26,43,.82);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
}

/* ---------- 数据带 ---------- */
.data-strip{
  background:var(--paper);
  border-block:1px solid var(--mist);
  padding-block:clamp(18px,2.4vw,28px);
}
.stat-num{
  font-family:var(--font-mono);
  font-size:clamp(22px,2.6vw,32px);
  font-weight:500;
  letter-spacing:.02em;
  color:var(--navy-800);
  font-variant-numeric:tabular-nums;
}
.stat-label{
  font-size:12.5px;
  letter-spacing:.1em;
  color:var(--navy-600);
}

/* ---------- 面包屑 ---------- */
.breadcrumb{margin-bottom:clamp(16px,2vw,26px);}
.breadcrumb ol{
  display:flex;flex-wrap:wrap;gap:6px 0;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--navy-600);
}
.breadcrumb li + li::before{
  content:"/";
  margin:0 10px;
  color:var(--blue-400);
}
.breadcrumb a{
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:border-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease);
}
.breadcrumb a:hover{border-bottom-color:var(--coral);color:var(--navy-800);}

/* ---------- 章节索引轨 ---------- */
.index-rail{
  position:sticky;
  top:calc(var(--header-h) + 24px);
  display:flex;
  flex-direction:column;
  gap:4px;
  width:64px;
}
.index-rail a{
  display:flex;align-items:center;gap:8px;
  padding:6px 0;
  border-left:2px solid transparent;
  padding-left:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--navy-600);
  text-decoration:none;
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.index-rail a:hover{color:var(--navy-800);border-left-color:var(--coral-soft);}
.index-rail a[aria-current="true"]{
  color:var(--navy-800);
  border-left-color:var(--coral);
  font-weight:700;
}

/* ---------- 折叠面板 ---------- */
.fold{border-top:1px solid var(--grid-line);}
.fold:last-child{border-bottom:1px solid var(--grid-line);}
.fold-trigger{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  width:100%;
  padding:16px 0;
  text-align:left;
  font-size:16px;
  font-weight:700;
  letter-spacing:-.01em;
  cursor:pointer;
  transition:color var(--t-fast) var(--ease);
}
.fold-trigger:hover{color:var(--navy-600);}
.fold-icon{
  width:9px;height:9px;
  border-right:1.5px solid currentColor;
  border-bottom:1.5px solid currentColor;
  transform:rotate(-45deg);
  transition:transform var(--t-base) var(--ease);
  flex:none;
}
.fold-trigger[aria-expanded="true"] .fold-icon{transform:rotate(45deg);}
.fold-panel{padding:0 0 18px;font-size:14.5px;line-height:1.8;}
.fold-panel[hidden]{display:none;}

/* ==========================================================================
   头部：56px 紧凑命令栏
   ========================================================================== */
.site-header{
  position:sticky;
  top:0;
  z-index:90;
  background:var(--navy-900);
  color:var(--paper);
  border-bottom:1px solid var(--line-dark);
  --scroll-progress:0;
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:linear-gradient(90deg, rgba(62,143,176,.12) 1px, transparent 1px);
  background-size:48px 100%;
  pointer-events:none;
  opacity:.75;
}
.hdr-bar{
  position:relative;
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:clamp(12px,2vw,28px);
  height:var(--header-h);
}
.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  transform:scaleX(var(--scroll-progress,0));
  transform-origin:left center;
  background:linear-gradient(90deg,var(--teal),var(--coral));
  pointer-events:none;
  transition:transform .1s linear;
}

.skip-link{
  position:fixed;
  top:8px;left:8px;
  z-index:200;
  padding:10px 16px;
  background:var(--coral);
  color:var(--navy-900);
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  text-decoration:none;
  transform:translateY(-200%);
  transition:transform var(--t-fast) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);}

.hdr-brandgroup{display:flex;align-items:center;gap:12px;min-width:0;}
.hdr-brand{
  display:inline-flex;align-items:center;gap:9px;
  text-decoration:none;
  color:var(--paper);
}
.hdr-brand-mark{
  width:18px;height:18px;
  flex:none;
  background:linear-gradient(135deg,var(--coral) 0 55%,var(--blue-400) 55% 100%);
  clip-path:polygon(0 0,100% 0,100% 66%,66% 100%,0 100%);
}
.hdr-brand-text{
  font-size:15px;
  font-weight:900;
  letter-spacing:.01em;
  white-space:nowrap;
}
.hdr-brand-meta{
  padding-left:9px;
  border-left:1px solid var(--line-dark);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  color:rgba(245,248,250,.52);
  white-space:nowrap;
  transition:opacity var(--t-base) var(--ease);
}
.site-header[data-compact="true"] .hdr-brand-meta{opacity:0;}
.hdr-status{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:rgba(245,248,250,.7);
  white-space:nowrap;
}

.hdr-nav{justify-self:center;}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(6px,1.3vw,20px);
}
.nav-link{
  display:flex;
  flex-direction:column;
  gap:1px;
  padding:8px 6px;
  border-bottom:2px solid transparent;
  text-decoration:none;
  color:rgba(245,248,250,.80);
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.nav-num{
  font-family:var(--font-mono);
  font-size:9.5px;
  line-height:1;
  letter-spacing:.18em;
  color:rgba(62,143,176,.95);
  transition:color var(--t-fast) var(--ease);
}
.nav-label{font-size:12.5px;line-height:1.1;white-space:nowrap;}
.nav-link:hover{color:#fff;}
.nav-link:hover .nav-num{color:var(--coral-soft);}
.nav-link[aria-current="page"]{color:#fff;border-bottom-color:var(--coral);}
.nav-link[aria-current="page"] .nav-num{color:var(--teal);}
.nav-foot{display:none;}

.hdr-actions{display:flex;align-items:center;gap:10px;justify-self:end;}
.batch-chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 10px;
  border:1px solid rgba(62,143,176,.55);
  text-decoration:none;
  color:var(--paper);
  transition:border-color var(--t-fast) var(--ease);
}
.batch-chip:hover{border-color:var(--coral);}
.batch-chip-key{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:rgba(245,248,250,.6);
}
.batch-chip b{
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.06em;
  color:var(--coral);
}
.batch-chip:hover b{color:var(--coral-soft);}

.nav-toggle{
  display:none;
  align-items:center;gap:8px;
  padding:7px 10px;
  border:1px solid rgba(62,143,176,.55);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  cursor:pointer;
  transition:border-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease),background-color var(--t-fast) var(--ease);
}
.nav-toggle:hover{border-color:var(--coral);color:var(--coral-soft);}
.nav-toggle[aria-expanded="true"]{
  background:var(--coral);
  border-color:var(--coral);
  color:var(--navy-900);
}
.nav-toggle-bars{display:grid;gap:3px;width:14px;}
.nav-toggle-bars span{
  display:block;height:1.5px;width:100%;
  background:currentColor;
  transition:transform var(--t-base) var(--ease),opacity var(--t-fast) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(4.5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-4.5px) rotate(-45deg);}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer{
  position:relative;
  overflow:hidden;
  background:var(--navy-900);
  color:rgba(245,248,250,.78);
  border-top:1px solid var(--line-dark);
  padding-block:clamp(40px,5.4vw,72px) 22px;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(90deg, rgba(62,143,176,.10) 1px, transparent 1px),
    linear-gradient(0deg, rgba(62,143,176,.10) 1px, transparent 1px);
  background-size:48px 48px;
  pointer-events:none;
}
.site-footer > .shell{position:relative;z-index:1;}

.footer-top{
  display:grid;
  grid-template-columns:minmax(220px,1fr) minmax(0,2.4fr);
  gap:clamp(24px,4vw,56px);
  align-items:start;
}
.footer-brand-mark{
  display:block;
  width:26px;height:26px;
  background:linear-gradient(135deg,var(--coral) 0 55%,var(--blue-400) 55% 100%);
  clip-path:polygon(0 0,100% 0,100% 66%,66% 100%,0 100%);
}
.footer-title{
  margin-top:12px;
  font-size:16px;
  font-weight:900;
  letter-spacing:.02em;
  color:#fff;
}
.footer-lede{
  margin-top:8px;
  max-width:26em;
  font-size:14px;
  line-height:1.7;
  color:rgba(245,248,250,.72);
}
.footer-note{
  margin-top:14px;
  padding-top:12px;
  max-width:30em;
  border-top:1px solid rgba(62,143,176,.28);
  font-size:12px;
  line-height:1.7;
  color:rgba(245,248,250,.52);
}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(18px,2.4vw,32px);
}
.footer-col{min-width:0;}
.footer-col-title{
  margin-bottom:12px;
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:500;
  letter-spacing:.22em;
  color:var(--teal);
}
.footer-list{display:grid;gap:8px;}
.footer-link{
  display:inline-block;
  font-size:14px;
  line-height:1.6;
  color:rgba(245,248,250,.78);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.footer-link:hover{color:#fff;border-bottom-color:var(--coral);}
.footer-link[aria-current="page"]{color:var(--coral-soft);border-bottom-color:var(--coral-soft);}
.footer-link--sm{font-size:12px;}
.footer-value{
  font-family:var(--font-mono);
  font-size:12.5px;
  line-height:1.7;
  letter-spacing:.04em;
  color:rgba(245,248,250,.9);
  word-break:break-word;
}
.footer-value--addr{
  font-family:var(--font-sans);
  letter-spacing:0;
  color:rgba(245,248,250,.72);
}
.footer-formats{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  margin-top:12px;
}
.fmt-tag{
  padding:2px 6px;
  border:1px solid rgba(62,143,176,.6);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:rgba(245,248,250,.8);
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  margin-top:clamp(28px,4vw,48px);
  padding-top:18px;
  border-top:1px solid rgba(62,143,176,.28);
}
.footer-legal{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:rgba(245,248,250,.55);
}
.footer-legal-links{
  display:flex;
  flex-wrap:wrap;
  gap:18px;
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1080px){
  .hdr-bar{grid-template-columns:1fr auto;gap:12px;}
  .hdr-nav{
    position:fixed;
    left:0;right:0;bottom:0;
    z-index:95;
    max-height:84vh;
    overflow-y:auto;
    padding:18px clamp(16px,5vw,32px) calc(22px + env(safe-area-inset-bottom));
    background:var(--navy-800);
    border-top:2px solid var(--coral);
    box-shadow:0 -24px 60px -30px rgba(0,0,0,.65);
    transform:translateY(104%);
    visibility:hidden;
    transition:transform var(--t-base) var(--ease),visibility var(--t-base) var(--ease);
  }
  .hdr-nav[data-open="true"]{
    transform:translateY(0);
    visibility:visible;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0;}
  .nav-item + .nav-item{border-top:1px solid rgba(62,143,176,.25);}
  .nav-link{
    flex-direction:row;
    align-items:baseline;
    gap:14px;
    padding:14px 2px;
    border-bottom:0;
    color:var(--paper);
  }
  .nav-num{font-size:11px;min-width:22px;}
  .nav-label{font-size:16px;font-weight:700;}
  .nav-link[aria-current="page"]{
    border-bottom-color:transparent;
    box-shadow:inset 3px 0 0 var(--coral);
    padding-left:12px;
  }
  .nav-foot{
    display:flex;
    align-items:center;
    gap:12px;
    margin-top:18px;
    padding-top:16px;
    border-top:1px solid rgba(62,143,176,.28);
  }
  .hdr-actions .batch-chip{display:none;}
  .nav-toggle{display:inline-flex;}
  html.nav-open,
  html.nav-open body{overflow:hidden;}
  .hdr-brand-meta{display:none;}
}

@media (max-width:900px){
  .footer-top{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));}
  .index-rail{
    position:static;
    width:100%;
    flex-direction:row;
    gap:14px;
    overflow-x:auto;
    padding-bottom:6px;
  }
  .index-rail a{
    border-left:0;
    border-bottom:2px solid transparent;
    padding:6px 0;
    white-space:nowrap;
  }
  .index-rail a:hover{border-left-color:transparent;border-bottom-color:var(--coral-soft);}
  .index-rail a[aria-current="true"]{border-left-color:transparent;border-bottom-color:var(--coral);}
  .rail-note{writing-mode:horizontal-tb;letter-spacing:.24em;}
}

@media (max-width:640px){
  .hdr-status-text{display:none;}
  .hdr-cta{padding:9px 14px;font-size:12.5px;}
  .footer-grid{grid-template-columns:1fr;gap:26px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr));}
  .breadcrumb ol{font-size:11px;}
}

/* ==========================================================================
   动效降级
   ========================================================================== */
@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-progress{transition:none !important;}
  .media:hover img{transform:none;}
  .card:hover{transform:none;}
}