/* ==========================================================================
   云时代安卓版 · yun-android.com.cn
   共享样式表：/assets/site.css
   ========================================================================== */

/* 1. 设计变量 ------------------------------------------------------------- */
:root{
  --paper:#F6F8FC;
  --card:#FFFFFF;
  --rule:#DCE3EF;
  --ink:#0E1B2E;
  --ink-2:#5A6B85;
  --blue:#1F5BFF;
  --violet:#4B32C3;
  --cyan:#10B7B0;
  --orange:#FF6A2B;
  --night:#0A1526;

  --blue-soft:rgba(31,91,255,.09);
  --violet-soft:rgba(75,50,195,.08);
  --cyan-soft:rgba(16,183,176,.10);
  --orange-soft:rgba(255,106,43,.12);
  --cloud:linear-gradient(135deg,#1F5BFF 0%,#4B32C3 58%,#10B7B0 100%);

  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",sans-serif;
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --wrap:1240px;
  --pad:clamp(18px,4vw,40px);
  --r:14px;
  --r-s:9px;
  --paper-edge:0 1px 0 var(--rule),0 14px 30px -24px rgba(14,27,46,.55);
}

/* 2. Reset 与基础 --------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
main{display:block}
img,svg{max-width:100%;display:block}
img{height:auto}
h1,h2,h3,h4{
  margin:0 0 .55em;
  font-weight:700;
  line-height:1.25;
  letter-spacing:-.01em;
  color:var(--ink);
}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
strong,b{font-weight:700}
ul,ol{margin:0 0 1em;padding-left:1.2em}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:6px}
::selection{background:rgba(31,91,255,.18)}

.skip-link{
  position:absolute;left:14px;top:-70px;z-index:120;
  padding:10px 18px;border-radius:0 0 12px 12px;
  background:var(--night);color:#fff;font-size:14px;
  transition:top .2s ease;
}
.skip-link:focus{top:0;text-decoration:none}

.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* 3. 布局容器 ------------------------------------------------------------- */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--pad)}

.section{padding:clamp(46px,7vw,96px) 0;position:relative}
.section--tight{padding:clamp(28px,4vw,48px) 0}
.section--ruled{border-top:1px solid var(--rule)}

.split{
  display:grid;
  grid-template-columns:minmax(0,4fr) minmax(0,8fr);
  gap:clamp(24px,5vw,72px);
  align-items:start;
}
.split--5-7{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.stack{display:flex;flex-direction:column;gap:clamp(14px,2vw,22px)}
.btn-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center}

/* 4. 排版元件 ------------------------------------------------------------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--blue);margin-bottom:14px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.65}
.display-1{font-size:clamp(34px,5.2vw,56px);line-height:1.1;letter-spacing:-.02em;margin-bottom:.4em}
.display-2{font-size:clamp(28px,3.6vw,40px);line-height:1.15;letter-spacing:-.02em}
.lead{font-size:clamp(16px,1.5vw,20px);line-height:1.7;color:var(--ink-2);max-width:60ch}
.meta{font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--ink-2)}
.num{font-family:var(--mono);font-size:12px;letter-spacing:.18em;color:var(--ink-2)}
.num--blue{color:var(--blue)}
.prose{max-width:68ch}
.prose p{font-size:16px;line-height:1.75}

/* 5. 章节编号体系 --------------------------------------------------------- */
.chapter{padding:clamp(40px,6vw,84px) 0;border-top:1px solid var(--rule);position:relative}
.chapter-head{display:flex;gap:16px;align-items:baseline;flex-wrap:wrap;margin-bottom:18px}
.chapter-num{font-family:var(--mono);font-size:12px;letter-spacing:.22em;color:var(--blue)}
.chapter-title{font-size:clamp(22px,2.6vw,28px);margin:0}
.chapter-body{max-width:68ch;font-size:16px}

/* 6. 按钮 ----------------------------------------------------------------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;border-radius:999px;
  font-size:15px;font-weight:600;font-family:inherit;
  border:1px solid transparent;cursor:pointer;
  transition:background .22s ease,border-color .22s ease,color .22s ease,transform .22s ease;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn--primary{background:var(--blue);border-color:var(--blue);color:#fff}
.btn--primary:hover{background:#1749d6;border-color:#1749d6}
.btn--ghost{background:var(--card);border-color:var(--rule);color:var(--ink)}
.btn--ghost:hover{border-color:var(--blue);color:var(--blue)}
.btn--accent{background:var(--orange);border-color:var(--orange);color:var(--ink)}
.btn--accent:hover{background:#ff7d47;border-color:#ff7d47}
.btn--sm{padding:8px 16px;font-size:13px}

/* 7. 卡片、面板与标签 ----------------------------------------------------- */
.card{
  position:relative;background:var(--card);
  border:1px solid var(--rule);border-radius:var(--r);
  padding:clamp(18px,2.4vw,26px);box-shadow:var(--paper-edge);
}
.card--stack{isolation:isolate}
.card--stack::after{
  content:"";position:absolute;left:12px;top:12px;right:-12px;bottom:-12px;
  border:1px solid var(--rule);border-radius:var(--r);
  background:rgba(255,255,255,.6);z-index:-1;
}
.card--flat{box-shadow:none}
.card-title{font-size:20px;margin:0 0 8px}
.card-body{color:var(--ink-2);font-size:15px;line-height:1.7}

.panel{
  position:relative;overflow:hidden;
  background:var(--night);color:#E9EFFA;
  border:1px solid rgba(255,255,255,.12);border-radius:var(--r);
  padding:clamp(20px,2.6vw,30px);
}
.panel::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(120% 90% at 10% 0%,rgba(31,91,255,.46),transparent 58%),
    radial-gradient(90% 80% at 100% 100%,rgba(75,50,195,.5),transparent 60%);
}
.panel > *{position:relative;z-index:1}
.panel .card-title,.panel h2,.panel h3{color:#fff}
.panel-title{
  font-family:var(--mono);font-size:12px;letter-spacing:.18em;
  color:rgba(233,239,250,.62);margin:0 0 14px;font-weight:600;
}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:999px;
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;
  border:1px solid var(--rule);background:var(--card);color:var(--ink-2);
}
.tag--blue{color:var(--blue);border-color:rgba(31,91,255,.35);background:var(--blue-soft)}
.tag--violet{color:var(--violet);border-color:rgba(75,50,195,.32);background:var(--violet-soft)}
.tag--sync{color:#0B7C77;border-color:rgba(16,183,176,.45);background:var(--cyan-soft)}
.tag--pin{color:#A93A08;border-color:rgba(255,106,43,.5);background:var(--orange-soft)}

/* 8. 索引列表与面包屑 ----------------------------------------------------- */
.link-list{list-style:none;margin:0;padding:0}
.link-list li{border-top:1px solid var(--rule)}
.link-list li:last-child{border-bottom:1px solid var(--rule)}
.link-list a{
  display:flex;justify-content:space-between;align-items:baseline;gap:14px;
  padding:15px 2px;color:var(--ink);font-size:15px;
}
.link-list a:hover{color:var(--blue);text-decoration:none}
.link-list a::after{content:"→";font-family:var(--mono);color:var(--ink-2);transition:transform .22s ease,color .22s ease}
.link-list a:hover::after{transform:translateX(4px);color:var(--blue)}
.link-list--tight a{padding:11px 2px;font-size:14px}

.breadcrumbs{padding:20px 0 0}
.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0;
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--ink-2)}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:var(--rule)}
.breadcrumbs a{color:var(--ink-2)}
.breadcrumbs a:hover{color:var(--blue)}

/* 9. 图片容器（供页面阶段放置占位图） ------------------------------------- */
.media{
  position:relative;overflow:hidden;width:100%;
  border:1px solid var(--rule);border-radius:var(--r);
  aspect-ratio:16/10;
  background:
    linear-gradient(135deg,rgba(31,91,255,.10),rgba(75,50,195,.08) 55%,rgba(16,183,176,.12)),
    var(--card);
}
.media img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:4/5}
.media__cap{
  position:absolute;left:0;right:0;bottom:0;
  padding:10px 14px;font-family:var(--mono);font-size:11px;letter-spacing:.08em;
  color:var(--ink-2);background:linear-gradient(0deg,rgba(255,255,255,.94),rgba(255,255,255,0));
}
.media-grid{display:grid;gap:16px;grid-template-columns:repeat(2,minmax(0,1fr))}
.media-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}

/* 10. 页头 ---------------------------------------------------------------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(246,248,252,.94);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--rule);
}
.header-scan{
  height:3px;
  background:linear-gradient(90deg,var(--blue),var(--violet) 42%,var(--cyan) 72%,var(--orange));
  background-size:220% 100%;
  animation:scan 9s linear infinite;
}
@keyframes scan{from{background-position:0 0}to{background-position:-220% 0}}

.header-rail{
  width:100%;max-width:var(--wrap);margin:0 auto;
  padding:12px var(--pad);
  display:flex;align-items:center;gap:clamp(14px,2vw,28px);
}

.header-brand{flex:0 0 auto}
.brand{display:inline-flex;align-items:center;gap:12px;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand-mark{
  position:relative;flex:0 0 auto;width:36px;height:36px;border-radius:11px;
  background:var(--cloud);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.45),0 8px 18px -12px rgba(31,91,255,.9);
}
.brand-mark-dot{
  position:absolute;inset:11px;border-radius:50%;background:#fff;
  box-shadow:0 0 0 3px rgba(255,255,255,.3);
}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-name{font-size:16px;font-weight:700;letter-spacing:-.01em;color:var(--ink)}
.brand-sub{font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--ink-2)}

.site-nav{margin-right:auto}
.nav-list{
  counter-reset:navidx;
  display:flex;align-items:center;gap:2px;
  list-style:none;margin:0;padding:0;
}
.nav-list li{counter-increment:navidx}
.nav-list a{
  display:inline-flex;align-items:baseline;gap:6px;
  padding:8px 12px;border-radius:8px;
  font-size:14px;color:var(--ink);white-space:nowrap;
  transition:background .2s ease,color .2s ease;
}
.nav-list a::before{
  content:counter(navidx,decimal-leading-zero);
  font-family:var(--mono);font-size:10px;letter-spacing:.06em;color:var(--ink-2);
}
.nav-list a:hover{background:var(--blue-soft);color:var(--blue);text-decoration:none}
.nav-list a[aria-current="page"]{
  background:var(--blue-soft);color:var(--blue);font-weight:700;
  box-shadow:inset 0 -2px 0 var(--blue);
}
.nav-list a[aria-current="page"]::before{color:var(--blue)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 14px;border-radius:999px;
  background:var(--card);border:1px solid var(--rule);
  color:var(--ink);font-size:13px;cursor:pointer;
}
.nav-toggle:hover{border-color:var(--blue);color:var(--blue)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:2px;border-radius:2px;background:currentColor}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;background:currentColor;
  transition:transform .24s ease;
}
.nav-toggle-bars::before{top:-5px}
.nav-toggle-bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg)}

.header-tools{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.tool-chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:7px 13px;border-radius:999px;
  background:var(--card);border:1px solid var(--rule);
  font-size:13px;color:var(--ink-2);cursor:pointer;
  transition:border-color .2s ease,color .2s ease,background .2s ease;
}
.tool-chip:hover{border-color:var(--blue);color:var(--blue);text-decoration:none}
.tool-chip--pin{background:var(--orange-soft);border-color:rgba(255,106,43,.5);color:var(--ink);font-weight:600}
.tool-chip--pin:hover{border-color:var(--orange);color:#A93A08}
.tool-chip--pin[aria-pressed="true"]{background:var(--orange);border-color:var(--orange);color:var(--ink)}
.chip-pin{
  width:9px;height:9px;border-radius:50%;
  background:var(--orange);box-shadow:0 0 0 3px rgba(255,106,43,.2);
}
.tool-chip--pin[aria-pressed="true"] .chip-pin{background:var(--ink);box-shadow:0 0 0 3px rgba(14,27,46,.18)}
.tool-chip--search{font-family:var(--mono);font-size:12px;letter-spacing:.06em}
.site-tag{
  display:inline-flex;align-items:center;gap:7px;
  padding-left:12px;margin-left:2px;border-left:1px solid var(--rule);
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--ink-2);
}
.site-tag::before{
  content:"";width:7px;height:7px;border-radius:50%;
  background:var(--cyan);box-shadow:0 0 0 3px rgba(16,183,176,.18);
}

/* 11. 页脚 ---------------------------------------------------------------- */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  background:var(--night);
  color:rgba(233,239,250,.72);
  position:relative;
}
.site-footer a{color:rgba(233,239,250,.8)}
.site-footer a:hover{color:#fff;text-decoration:none}

.footer-rail{
  position:sticky;bottom:0;z-index:70;
  border-top:1px solid rgba(255,255,255,.14);
  border-bottom:1px solid rgba(255,255,255,.08);
  background:linear-gradient(90deg,#0C1A30,#131F3E 58%,#1A1B44);
}
.footer-rail-inner{
  width:100%;max-width:var(--wrap);margin:0 auto;
  padding:12px var(--pad);
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
}
.footer-rail-tag{
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;
  color:rgba(233,239,250,.42);
}
.footer-rail-link{
  color:#fff!important;font-size:14px;font-weight:600;
  padding-bottom:2px;border-bottom:1px solid rgba(255,106,43,.75);
}
.footer-rail-link:hover{border-bottom-color:var(--orange)}
.footer-rail-top{
  margin-left:auto;
  padding:8px 16px;border-radius:999px;cursor:pointer;
  background:transparent;border:1px solid rgba(255,255,255,.24);
  color:#fff;font-size:13px;
  transition:background .2s ease,border-color .2s ease;
}
.footer-rail-top:hover{background:rgba(31,91,255,.32);border-color:rgba(31,91,255,.7)}

.footer-body{
  width:100%;max-width:var(--wrap);margin:0 auto;
  padding:clamp(40px,6vw,72px) var(--pad) 28px;
  display:grid;
  grid-template-columns:minmax(0,4fr) minmax(0,8fr);
  gap:clamp(28px,5vw,64px);
}
.brand--footer .brand-name{color:#fff}
.brand--footer .brand-sub{color:rgba(233,239,250,.45)}
.footer-motto{margin:18px 0 14px;font-size:15px;color:rgba(233,239,250,.75)}
.footer-marks{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}
.footer-marks li{
  position:relative;padding-left:18px;
  font-size:13px;color:rgba(233,239,250,.62);
}
.footer-marks li::before{
  content:"";position:absolute;left:0;top:.68em;
  width:7px;height:7px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 0 3px rgba(16,183,176,.16);
}
.footer-nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}
.footer-col-title{
  margin:0 0 14px;font-family:var(--mono);font-size:11px;font-weight:600;
  letter-spacing:.16em;color:rgba(233,239,250,.45);text-transform:uppercase;
}
.footer-col ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}
.footer-col a{font-size:14px;color:rgba(233,239,250,.78)}

.footer-base{
  width:100%;max-width:var(--wrap);margin:0 auto;
  padding:20px var(--pad) 40px;
  border-top:1px solid rgba(255,255,255,.1);
  display:flex;flex-wrap:wrap;gap:8px 26px;
  font-family:var(--mono);font-size:12px;letter-spacing:.04em;
  color:rgba(233,239,250,.5);
}
.footer-base-line{margin:0}
.footer-base-line--note{color:rgba(233,239,250,.42)}
.footer-base-line--icp{color:rgba(233,239,250,.62)}
.footer-base-line--copy{margin-left:auto;color:rgba(233,239,250,.6)}

/* 12. 滚动与显现状态 ------------------------------------------------------ */
.scroll-progress{
  position:fixed;top:0;left:0;height:3px;width:0;z-index:200;
  background:linear-gradient(90deg,var(--blue),var(--violet) 55%,var(--cyan));
  pointer-events:none;
}
html.js-ready .reveal{opacity:0;transform:translateY(8px);transition:opacity .4s ease,transform .4s ease}
html.js-ready .reveal.is-visible{opacity:1;transform:none}

[data-chapter-link]{
  transition:color .2s ease,border-color .2s ease;
}
[data-chapter-link][aria-current="true"]{color:var(--blue);font-weight:600}

/* 13. 响应式 -------------------------------------------------------------- */
@media (max-width:1024px){
  .nav-toggle{display:inline-flex;order:3}
  .header-tools{order:2;margin-left:auto}
  .header-tools .tool-chip--search,
  .header-tools .site-tag{display:none}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;
    background:var(--card);
    border-top:1px solid var(--rule);
    border-bottom:1px solid var(--rule);
    padding:10px var(--pad) 20px;
    margin:0;
    box-shadow:0 24px 40px -30px rgba(14,27,46,.6);
  }
  .site-nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .nav-list li{border-bottom:1px solid var(--rule)}
  .nav-list li:last-child{border-bottom:0}
  .nav-list a{padding:14px 2px;border-radius:0;font-size:15px;justify-content:flex-start}
  .nav-list a[aria-current="page"]{box-shadow:none;background:transparent}
}

@media (max-width:900px){
  .split,.split--5-7{grid-template-columns:minmax(0,1fr)}
  .grid-2,.grid-3{grid-template-columns:minmax(0,1fr)}
  .footer-body{grid-template-columns:minmax(0,1fr)}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px 20px}
  .media-grid,.media-grid--2{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:640px){
  .brand-sub{display:none}
  .tool-chip--pin .chip-text{font-size:12px}
  .tool-chip{padding:7px 11px}
  .footer-rail-inner{gap:10px}
  .footer-rail-top{margin-left:0;width:100%;text-align:center}
  .footer-base{flex-direction:column;gap:6px}
  .footer-base-line--copy{margin-left:0}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .header-scan{animation:none;background-position:0 0}
  html.js-ready .reveal{opacity:1;transform:none}
  .btn:hover{transform:none}
}