/* =========================================================
   BIBO必博 · 共享站点样式 /assets/site.css
   深空蓝底 · 暖金循光 · 堆叠面板语言
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root{
  --deep-space:#081226;
  --star-indigo:#0F2244;
  --indigo-veil:#1B2452;
  --deep-teal:#0B3B3C;
  --wine:#4A1226;
  --gold:#E8B45C;
  --gold-deep:#8A6A34;
  --paper:#F4F1EA;
  --slate:#8FA0BF;
  --beam:linear-gradient(90deg,#4FD1E0,#2A6BE0);
  --radius-sm:12px;
  --radius-md:24px;
  --radius-lg:32px;
  --radius-pill:999px;
  --shell-max:1320px;
  --gutter:clamp(16px,4vw,44px);
  --section-gap:clamp(64px,9vw,132px);
  --ease:cubic-bezier(.22,.61,.36,1);
  --hairline:1px solid rgba(138,106,52,.42);
  --glow:inset 0 0 0 1px rgba(244,241,234,.045),0 26px 60px -34px rgba(0,0,0,.95);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:130px;
}
body{
  margin:0;
  background-color:var(--deep-space);
  background-image:
    radial-gradient(120% 90% at 6% -12%,rgba(42,107,224,.30),transparent 62%),
    radial-gradient(85% 65% at 102% 4%,rgba(232,180,92,.14),transparent 58%),
    radial-gradient(75% 60% at 50% 118%,rgba(11,59,60,.55),transparent 62%);
  background-repeat:no-repeat;
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}
main:focus{outline:none}
#main-content{scroll-margin-top:130px}
::selection{background:rgba(232,180,92,.32);color:var(--paper)}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:8px}

/* ---------- 3. 通用容器与文本层级 ---------- */
.shell{
  width:100%;
  max-width:var(--shell-max);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}
.section{padding-block:var(--section-gap)}
.section-head{
  display:flex;
  flex-direction:column;
  gap:14px;
  max-width:760px;
}
.display-1{
  font-size:clamp(38px,7vw,88px);
  font-weight:800;
  line-height:1.06;
  letter-spacing:.02em;
}
.section-title{
  font-size:clamp(26px,3.4vw,40px);
  font-weight:700;
  line-height:1.22;
  letter-spacing:.02em;
}
.card-title{
  font-size:clamp(18px,2vw,24px);
  font-weight:700;
  line-height:1.35;
  letter-spacing:.02em;
}
.lede{
  font-size:clamp(17px,1.4vw,19px);
  color:#CFD8E8;
  max-width:40ch;
}
.text-mute{color:var(--slate)}
.mono{
  font-family:var(--font-mono);
  letter-spacing:.08em;
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--gold);
}
.prose{
  display:flex;
  flex-direction:column;
  gap:18px;
  max-width:40em;
}
.prose p{color:#DCE3F0}
.beam-rule{
  height:1px;
  border:0;
  margin:0;
  border-radius:2px;
  background:var(--beam);
  opacity:.7;
}

/* ---------- 4. 可访问性工具类 ---------- */
.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;
}
.skip-link{
  position:absolute;
  left:16px;
  top:-120px;
  z-index:200;
  display:inline-flex;
  align-items:center;
  padding:11px 20px;
  border-radius:var(--radius-pill);
  background:var(--gold);
  color:#0A1526;
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  text-decoration:none;
  transition:top .22s var(--ease);
}
.skip-link:focus{top:14px}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  font-size:15px;
  font-weight:600;
  letter-spacing:.05em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .25s var(--ease),background-color .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.btn-gold{
  background:linear-gradient(135deg,#F2CE86,#E8B45C 55%,#C9922F);
  color:#0A1526;
  box-shadow:0 14px 30px -18px rgba(232,180,92,.95);
}
.btn-gold:hover{transform:translateY(-2px)}
.btn-ghost{
  background:transparent;
  border-color:rgba(232,180,92,.5);
  color:var(--gold);
}
.btn-ghost:hover{
  background-color:rgba(232,180,92,.12);
  transform:translateY(-2px);
}

/* ---------- 6. 头部：悬浮胶囊浮岛 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:90;
  padding:16px var(--gutter) 14px;
  transition:padding .3s var(--ease);
}
.site-header[data-scrolled]{padding-top:9px;padding-bottom:9px}
.header-shell{
  position:relative;
  display:flex;
  align-items:center;
  gap:12px;
  width:100%;
  max-width:var(--shell-max);
  margin:0 auto;
}
.brand-island{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:0;
  padding:9px 18px;
  border-radius:var(--radius-pill);
  background-color:rgba(15,34,68,.78);
  border:var(--hairline);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  box-shadow:0 18px 40px -30px rgba(0,0,0,.95);
}
.brand-mark{
  font-size:19px;
  font-weight:800;
  letter-spacing:.06em;
  text-decoration:none;
  color:var(--paper);
  white-space:nowrap;
}
.brand-mark-accent{color:var(--gold)}
.brand-slogan{
  padding-left:12px;
  border-left:1px solid rgba(143,160,191,.32);
  font-size:13px;
  letter-spacing:.08em;
  color:var(--slate);
  white-space:nowrap;
  transition:opacity .25s var(--ease);
}
.site-header[data-scrolled] .brand-slogan{display:none}
.version-chip{
  padding:3px 10px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(232,180,92,.36);
  background-color:rgba(232,180,92,.12);
  color:var(--gold);
  font-size:11px;
  letter-spacing:.1em;
  white-space:nowrap;
}
.nav-island{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:6px 8px 6px 12px;
  border-radius:var(--radius-pill);
  background-color:rgba(15,34,68,.72);
  border:1px solid rgba(138,106,52,.32);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
}
.nav-item{display:block}
.nav-link{
  display:block;
  padding:8px 13px;
  border-radius:var(--radius-pill);
  color:var(--slate);
  font-size:15px;
  letter-spacing:.06em;
  text-decoration:none;
  white-space:nowrap;
  transition:color .25s var(--ease),background-color .25s var(--ease),box-shadow .25s var(--ease);
}
.nav-link:hover{color:var(--paper);background-color:rgba(79,209,224,.13)}
.nav-link[aria-current="page"]{
  color:var(--gold);
  background-color:rgba(232,180,92,.14);
  box-shadow:inset 0 0 0 1px rgba(232,180,92,.45);
}
.nav-extra{
  display:flex;
  align-items:center;
  gap:8px;
  padding-left:10px;
  border-left:1px solid rgba(143,160,191,.24);
}
.chip{
  display:inline-flex;
  align-items:center;
  padding:6px 13px;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  font-size:13px;
  letter-spacing:.06em;
  text-decoration:none;
  white-space:nowrap;
  transition:transform .25s var(--ease),background-color .25s var(--ease),border-color .25s var(--ease);
}
.chip:hover{transform:translateY(-1px)}
.chip-enterprise{
  background-color:rgba(74,18,38,.85);
  border-color:rgba(232,180,92,.45);
  color:#F3C6B4;
}
.chip-family{
  background-color:rgba(11,59,60,.85);
  border-color:rgba(79,209,224,.4);
  color:#A8E6E4;
}
.nav-library{padding:9px 18px;font-size:14px}
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  margin-left:auto;
  padding:11px 18px;
  border-radius:var(--radius-pill);
  background-color:rgba(15,34,68,.8);
  border:var(--hairline);
  color:var(--paper);
  font-size:14px;
  letter-spacing:.08em;
  cursor:pointer;
}
.nav-toggle-icon{
  position:relative;
  display:block;
  width:18px;
  height:2px;
  border-radius:2px;
  background-color:var(--gold);
  transition:background-color .2s var(--ease);
}
.nav-toggle-icon::before,
.nav-toggle-icon::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  border-radius:2px;
  background-color:var(--gold);
  transition:transform .28s var(--ease);
}
.nav-toggle-icon::before{top:-6px}
.nav-toggle-icon::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon{background-color:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after{transform:translateY(-6px) rotate(-45deg)}
.scroll-beam{
  position:absolute;
  left:var(--gutter);
  right:var(--gutter);
  bottom:4px;
  height:2px;
  border-radius:2px;
  background:var(--beam);
  transform:scaleX(0);
  transform-origin:0 50%;
  opacity:.85;
  pointer-events:none;
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:var(--section-gap);
  padding:clamp(48px,7vw,88px) 0 40px;
  border-top:1px solid rgba(138,106,52,.28);
  background-image:linear-gradient(180deg,rgba(8,18,38,0) 0%,rgba(15,34,68,.78) 24%,rgba(8,18,38,.98) 100%);
}
.footer-beam{
  position:absolute;
  top:-1px;left:0;right:0;
  height:1px;
  background:var(--beam);
  opacity:.75;
}
.footer-shell{
  width:100%;
  max-width:var(--shell-max);
  margin:0 auto;
  padding:0 var(--gutter);
}
.footer-grid{
  display:grid;
  gap:clamp(26px,3.4vw,44px);
  grid-template-columns:1.5fr repeat(4,minmax(0,.82fr)) 1.7fr;
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:8px}
.footer-mark{font-size:22px;font-weight:800;letter-spacing:.08em}
.footer-mark-accent{color:var(--gold)}
.footer-slogan{font-size:14px;letter-spacing:.08em;color:var(--slate)}
.footer-version{font-size:11.5px;letter-spacing:.1em;color:var(--gold-deep)}
.footer-cta{margin-top:8px}
.footer-col-title{
  font-size:12px;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--gold);
}
.footer-links{display:flex;flex-direction:column;gap:10px;margin-top:16px}
.footer-link{
  position:relative;
  display:inline-block;
  font-size:15px;
  color:var(--slate);
  text-decoration:none;
  transition:color .22s var(--ease);
}
.footer-link:hover{color:var(--paper)}
.footer-link[aria-current="page"]{color:var(--gold)}
.footer-contact-list{display:flex;flex-direction:column;gap:14px;margin-top:16px}
.contact-item{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 10px;
}
.contact-label{
  padding:2px 9px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(232,180,92,.3);
  background-color:rgba(232,180,92,.1);
  color:var(--gold);
  font-size:11px;
  letter-spacing:.12em;
}
.contact-value{font-size:14.5px;color:var(--paper);word-break:break-word}
.copy-btn{
  margin-left:auto;
  padding:3px 12px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(143,160,191,.35);
  color:var(--slate);
  font-size:12px;
  letter-spacing:.08em;
  cursor:pointer;
  transition:color .22s var(--ease),border-color .22s var(--ease),background-color .22s var(--ease);
}
.copy-btn:hover{color:var(--gold);border-color:rgba(232,180,92,.5)}
.copy-btn[data-copied]{
  color:#0A1526;
  background-color:var(--gold);
  border-color:var(--gold);
}
.footer-note{
  margin-top:18px;
  padding-left:12px;
  border-left:2px solid var(--gold-deep);
  font-size:13px;
  color:var(--slate);
}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 22px;
  margin-top:clamp(30px,4vw,52px);
  padding-top:22px;
  border-top:1px solid rgba(143,160,191,.2);
}
.footer-bottom{font-size:12px;letter-spacing:.1em;color:var(--slate)}
.footer-meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--slate);
}
.dot{opacity:.45}
.to-top{
  position:fixed;
  right:clamp(16px,3vw,32px);
  bottom:clamp(16px,3vw,32px);
  z-index:70;
  display:none;
  align-items:center;
  padding:11px 18px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(232,180,92,.45);
  background-color:rgba(15,34,68,.92);
  color:var(--gold);
  font-size:13px;
  letter-spacing:.1em;
  cursor:pointer;
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.to-top[data-visible]{display:inline-flex}

/* ---------- 8. 堆叠面板 / 卡片 ---------- */
.panel{
  position:relative;
  padding:clamp(22px,3vw,40px);
  border-radius:var(--radius-lg);
  border:var(--hairline);
  background-image:linear-gradient(160deg,rgba(15,34,68,.94),rgba(8,18,38,.94));
  box-shadow:var(--glow);
  overflow:hidden;
}
.panel--enterprise{
  background-image:linear-gradient(160deg,rgba(74,18,38,.94),rgba(11,17,34,.96));
  border-color:rgba(232,180,92,.3);
}
.panel--family{
  background-image:linear-gradient(160deg,rgba(11,59,60,.94),rgba(8,20,30,.96));
  border-color:rgba(79,209,224,.3);
}
.panel--indigo{
  background-image:linear-gradient(160deg,rgba(27,36,82,.94),rgba(8,18,38,.94));
}
.panel-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:12px 20px;
  padding-bottom:16px;
  margin-bottom:24px;
  border-bottom:1px solid rgba(143,160,191,.22);
}
.chapter-no{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.18em;
  color:var(--gold);
}
.summary-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 16px;
  font-size:14px;
  color:var(--slate);
}
.card{
  padding:clamp(18px,2.2vw,26px);
  border-radius:var(--radius-md);
  border:1px solid rgba(143,160,191,.2);
  background-color:rgba(15,34,68,.6);
  transition:transform .3s var(--ease),border-color .3s var(--ease);
}
.card:hover{transform:translateY(-3px);border-color:rgba(232,180,92,.45)}
.card-title + .card-text{margin-top:10px}
.card-text{font-size:15px;color:var(--slate)}
.stat{display:flex;flex-direction:column;gap:4px}
.stat-value{
  font-family:var(--font-mono);
  font-size:clamp(26px,3vw,40px);
  line-height:1.1;
  color:var(--gold);
}
.stat-label{font-size:13px;letter-spacing:.08em;color:var(--slate)}
.tagrow{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  display:inline-flex;
  align-items:center;
  padding:4px 11px;
  border-radius:6px;
  border:1px solid rgba(143,160,191,.3);
  background-color:rgba(143,160,191,.14);
  color:#C6D2E6;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
}
.tag--enterprise{
  border-color:rgba(232,180,92,.4);
  background-color:rgba(74,18,38,.7);
  color:#F3C6B4;
}
.tag--family{
  border-color:rgba(79,209,224,.4);
  background-color:rgba(11,59,60,.7);
  color:#A8E6E4;
}

/* ---------- 9. 网格 / 横向叙事轨 ---------- */
.grid{display:grid;gap:clamp(18px,2.2vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(160px,.32fr) minmax(0,1fr)}
.rail{
  display:flex;
  gap:18px;
  padding-bottom:16px;
  overflow-x:auto;
  scroll-snap-type:x mandatory;
  scrollbar-color:var(--gold-deep) transparent;
}
.rail-item{
  flex:0 0 min(340px,78vw);
  scroll-snap-align:start;
}

/* ---------- 10. 章节索引轨 / 面包屑 ---------- */
.index-track{
  position:sticky;
  top:130px;
  display:flex;
  flex-direction:column;
  gap:6px;
}
.index-link{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:6px 12px;
  border-radius:var(--radius-pill);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--slate);
  text-decoration:none;
  transition:color .22s var(--ease),background-color .22s var(--ease);
}
.index-link:hover{color:var(--paper)}
.index-link[aria-current="true"]{
  color:var(--gold);
  background-color:rgba(232,180,92,.12);
}
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--slate);
}
.crumb-link{color:var(--slate);text-decoration:none}
.crumb-link:hover{color:var(--gold)}
.crumb-sep{opacity:.5}

/* ---------- 11. 图片容器（页面阶段放 img） ---------- */
.media-frame{
  position:relative;
  border-radius:var(--radius-lg);
  border:1px solid rgba(138,106,52,.4);
  background-color:var(--star-indigo);
  overflow:hidden;
}
.media-frame > img{
  display:block;
  width:100%;
  height:100%;
  aspect-ratio:16 / 10;
  object-fit:cover;
  filter:saturate(.9) brightness(.82) contrast(1.06);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(180deg,rgba(8,18,38,0) 42%,rgba(8,18,38,.74) 100%),
    radial-gradient(62% 62% at 18% 0%,rgba(232,180,92,.18),transparent 70%);
}
.media-frame--tall > img{aspect-ratio:4 / 5}
.media-frame--wide > img{aspect-ratio:21 / 9}

/* ---------- 12. 滚动显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .45s var(--ease),transform .45s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
[data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 13. 响应式 ---------- */
@media (max-width:1199px){
  .footer-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-brand{grid-column:span 3}
  .footer-contact{grid-column:span 3}
}
@media (max-width:1120px){
  .nav-toggle{display:inline-flex}
  .brand-island{flex:1 1 auto}
  .brand-slogan{display:none}
  .nav-island{
    position:absolute;
    left:0;
    right:0;
    top:calc(100% + 10px);
    margin-left:0;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:14px;
    border-radius:var(--radius-lg);
    background-color:rgba(11,22,44,.97);
    border:1px solid rgba(138,106,52,.4);
    box-shadow:0 34px 70px -30px rgba(0,0,0,.95);
    max-height:calc(100vh - 170px);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s linear;
  }
  .nav-island[data-open]{
    opacity:1;
    visibility:visible;
    transform:none;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{padding:12px 14px;border-radius:var(--radius-sm);font-size:16px}
  .nav-extra{
    flex-wrap:wrap;
    margin-top:12px;
    padding:14px 0 0;
    border-left:0;
    border-top:1px solid rgba(143,160,191,.24);
  }
  .nav-library{flex:1 1 auto}
}
@media (max-width:900px){
  .grid--2,
  .grid--3,
  .grid--split{grid-template-columns:minmax(0,1fr)}
  .index-track{
    position:static;
    flex-direction:row;
    flex-wrap:wrap;
    gap:6px;
  }
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand,
  .footer-contact{grid-column:span 2}
  .footer-base{flex-direction:column;align-items:flex-start}
  .nav-toggle-text{display:none}
  .nav-toggle{padding:12px 14px}
}
@media (max-width:420px){
  .version-chip{display:none}
}

/* ---------- 14. 动效退化 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
}