/* =========================================================
   冷心口袋 · 官网样式
   主题：冰白纸面 + 墨蓝首屏 + 钴蓝单一强调色
   版式：左侧固定目录轨道 + 右侧文档流（说明书结构）
   ========================================================= */

:root{
  --paper:#F4F7FA;
  --paper-2:#EAF0F7;
  --ink:#101C2E;
  --ink-2:#46586E;
  --ink-3:#7C8C9E;
  --blue:#2457C5;
  --blue-deep:#163C8F;
  --line:rgba(16,28,46,.14);
}

*,*::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:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",sans-serif;
  font-size:15px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

img{max-width:100%}

.wrap{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 20px;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:0 22px;
  border-radius:6px;
  border:1px solid transparent;
  font-size:14.5px;
  font-weight:700;
  text-decoration:none;
  white-space:nowrap;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-deep)}
.btn-ghost{border-color:rgba(255,255,255,.3);color:#fff}
.btn-ghost:hover{border-color:rgba(255,255,255,.62)}
.btn-solid{background:#fff;color:var(--ink)}
.btn-solid:hover{background:var(--paper-2)}
.btn-sm{min-height:36px;padding:0 14px;font-size:13px}

/* ---------- 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--paper);
  border-bottom:1px solid var(--line);
}
.site-header.is-scrolled{border-bottom-color:rgba(16,28,46,.28)}

.header-inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:12px;
  min-height:64px;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--ink);
  text-decoration:none;
}
.brand img{
  display:block;
  width:36px;
  height:36px;
  border-radius:8px;
}
.brand-name{font-size:16px;font-weight:800;letter-spacing:.01em}

.site-nav{display:none}
body.nav-open .site-nav{
  display:flex;
  flex-direction:column;
  position:absolute;
  left:-20px;
  right:-20px;
  top:100%;
  padding:4px 20px 12px;
  background:var(--paper);
  border-bottom:1px solid var(--line);
}
.site-nav a{
  display:block;
  padding:12px 2px;
  border-bottom:1px solid var(--line);
  font-size:14px;
  color:var(--ink-2);
  text-decoration:none;
}
.site-nav a:hover{color:var(--ink)}

.header-cta{margin-left:auto}

.nav-toggle{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:36px;
  height:36px;
  padding:0;
  border:1px solid var(--line);
  border-radius:6px;
  background:transparent;
  color:var(--ink);
  cursor:pointer;
}
.nav-toggle svg{display:block}

/* ---------- 首屏 ---------- */
.hero{
  background:var(--ink);
  color:#fff;
  padding:44px 0 52px;
}
.hero-grid{display:grid;gap:34px}

.hero-tag{
  margin:0;
  font-size:12.5px;
  letter-spacing:.08em;
  color:rgba(255,255,255,.62);
}
h1{
  margin:14px 0 16px;
  font-size:clamp(38px,9vw,76px);
  line-height:1.02;
  font-weight:800;
  letter-spacing:-.02em;
}
.hero-lead{
  margin:0;
  max-width:44ch;
  font-size:15px;
  line-height:1.75;
  color:rgba(255,255,255,.76);
}
.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:26px 0 24px;
}
.hero-meta{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
}
.hero-meta li{
  padding:4px 10px;
  border:1px solid rgba(255,255,255,.22);
  border-radius:4px;
  font-size:12px;
  color:rgba(255,255,255,.78);
}

.hero-frames{
  display:flex;
  align-items:flex-end;
  gap:14px;
}
.frame{
  margin:0;
  border:1px solid rgba(255,255,255,.2);
  border-radius:14px;
  overflow:hidden;
  background:#fff;
}
.frame img{display:block;width:100%;height:auto}
.frame figcaption{
  padding:8px 10px;
  background:var(--ink);
  font-size:11.5px;
  line-height:1.4;
  color:rgba(255,255,255,.7);
  letter-spacing:.04em;
}
.frame-notice{width:40%}
.frame-me{width:50%}

/* ---------- 文档主体 ---------- */
.doc-wrap{padding:0 0 64px}
.doc{display:grid;grid-template-columns:1fr}

.rail{display:none}
.doc-main{padding-top:40px}

.block{
  padding-top:30px;
  border-top:1px solid var(--line);
  margin-bottom:50px;
  scroll-margin-top:84px;
}

h2{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px;
  margin:0 0 12px;
  font-size:clamp(24px,4.8vw,34px);
  line-height:1.2;
  font-weight:800;
  letter-spacing:-.015em;
}
h2 .idx{
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--blue);
}

.lead{
  margin:0 0 22px;
  max-width:62ch;
  font-size:14.5px;
  line-height:1.75;
  color:var(--ink-2);
}

.prose p{
  margin:0 0 14px;
  max-width:66ch;
  font-size:14.5px;
  line-height:1.85;
  color:var(--ink-2);
}

.facts{
  display:grid;
  gap:0;
  margin:24px 0 0;
  padding:0;
  list-style:none;
  border-top:1px solid var(--line);
}
.facts li{
  display:grid;
  gap:3px;
  padding:13px 0;
  border-bottom:1px solid var(--line);
}
.facts b{font-size:14px}
.facts span{
  font-size:13.5px;
  line-height:1.7;
  color:var(--ink-2);
}

/* 目录列表 */
.cat-list{
  margin:0;
  padding:0;
  border-top:1px solid var(--line);
}
.cat-row{
  display:grid;
  gap:3px;
  padding:13px 0;
  border-bottom:1px solid var(--line);
}
.cat-row dt{font-size:14.5px;font-weight:700}
.cat-row dd{
  margin:0;
  font-size:13.5px;
  line-height:1.7;
  color:var(--ink-2);
}

/* 流程 */
.flow{
  display:grid;
  gap:24px;
  margin:0;
  padding:0;
  list-style:none;
}
.flow li{
  padding-top:12px;
  border-top:2px solid var(--ink);
}
.flow-no{
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--blue);
}
.flow h3{margin:8px 0 6px;font-size:15px}
.flow p{
  margin:0;
  font-size:13.5px;
  line-height:1.75;
  color:var(--ink-2);
}

/* 版本记录 */
.log{display:grid;gap:26px}
.log-item{
  padding-left:18px;
  border-left:2px solid var(--blue);
}
.log-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px;
  margin-bottom:8px;
}
.ver{font-size:18px;font-weight:800}
.log-note{
  padding:2px 7px;
  border-radius:4px;
  background:var(--blue);
  font-size:12px;
  color:#fff;
}
.log-date{
  margin-left:auto;
  font-size:12px;
  color:var(--ink-3);
}
.log-item ul{margin:0;padding-left:18px}
.log-item li{
  font-size:13.5px;
  line-height:1.8;
  color:var(--ink-2);
}

/* 界面截图 */
.shot-list{display:grid;gap:0}
.shot-row{
  display:grid;
  gap:16px;
  margin:0;
  padding:20px 0;
  border-top:1px solid var(--line);
}
.shot-row:last-child{border-bottom:1px solid var(--line)}
.shot-frame{
  max-width:210px;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:14px;
  background:#fff;
}
.shot-frame img{display:block;width:100%;height:auto}
.shot-row figcaption{display:grid;gap:5px;align-content:center}
.shot-row figcaption b{font-size:14px}
.shot-row figcaption span{
  font-size:13.5px;
  line-height:1.75;
  color:var(--ink-2);
  max-width:52ch;
}
.shot-note{
  margin:16px 0 0;
  font-size:12px;
  color:var(--ink-3);
}

/* 问答 */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{
  display:flex;
  align-items:baseline;
  gap:12px;
  padding:15px 0;
  font-size:14.5px;
  font-weight:700;
  cursor:pointer;
  list-style:none;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"+";
  margin-left:auto;
  font-size:16px;
  font-weight:400;
  color:var(--ink-3);
}
.faq details[open] summary::after{content:"−"}
.faq-no{font-size:11.5px;color:var(--blue)}
.faq details p{
  margin:0;
  padding:0 0 16px 27px;
  max-width:64ch;
  font-size:13.5px;
  line-height:1.8;
  color:var(--ink-2);
}

/* 下载区 */
.block-cta{
  padding-top:0;
  border-top:0;
  margin-bottom:0;
}
.cta{
  padding:30px 22px;
  border-radius:16px;
  background:var(--blue);
  color:#fff;
}
.cta h2{
  display:block;
  margin:10px 0 12px;
  font-size:clamp(23px,4.4vw,32px);
  color:#fff;
}
.cta p{
  margin:0 0 22px;
  max-width:52ch;
  font-size:14.5px;
  line-height:1.7;
  color:rgba(255,255,255,.8);
}
.cta .hero-tag{color:rgba(255,255,255,.7)}
.cta-actions{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:14px;
}
.cta-meta{font-size:12.5px;color:rgba(255,255,255,.74)}

/* ---------- 页脚 ---------- */
.site-footer{
  padding:26px 0;
  background:var(--ink);
  color:rgba(255,255,255,.72);
}
.footer-inner{
  display:flex;
  flex-direction:column;
  gap:8px;
}
.footer-brand{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:14px;
  font-weight:700;
  color:#fff;
}
.footer-brand img{
  display:block;
  width:24px;
  height:24px;
  border-radius:5px;
}
.footer-note{margin:0;font-size:12.5px}
.footer-copy{margin:0;font-size:12px}

/* ---------- 断点 ---------- */
@media (min-width:640px){
  .wrap{padding:0 28px}
  .header-inner{min-height:68px}

  .hero{padding:56px 0 64px}
  .hero-grid{gap:38px}

  .cat-row{grid-template-columns:160px minmax(0,1fr);align-items:baseline;gap:24px}
  .flow{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px 32px}
  .shot-row{grid-template-columns:210px minmax(0,1fr);align-items:center;column-gap:32px}

  .doc-main{padding-top:48px}
  .block{margin-bottom:56px}

  .cta{padding:42px 36px}

  .footer-inner{flex-direction:row;align-items:center;gap:22px}
  .footer-copy{margin-left:auto}
}

@media (min-width:900px){
  .site-nav{
    display:flex;
    align-items:center;
    gap:26px;
    margin-left:auto;
  }
  .site-nav a{
    padding:6px 0;
    border-bottom:0;
    font-size:13.5px;
  }
  .site-nav a:hover{color:var(--blue)}
  .header-cta{margin-left:32px}
  .nav-toggle{display:none}
  body.nav-open .site-nav{
    position:static;
    display:flex;
    flex-direction:row;
    padding:0;
    border:0;
    background:transparent;
  }

  .hero-grid{
    grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);
    align-items:center;
    column-gap:56px;
  }
  .hero-frames{gap:16px}
}

@media (min-width:1080px){
  .wrap{padding:0 36px}
  .header-inner{min-height:72px}

  .doc{
    grid-template-columns:206px minmax(0,1fr);
    column-gap:64px;
  }
  .rail{
    display:block;
    position:sticky;
    top:92px;
    align-self:start;
    padding-top:58px;
  }
  .rail-title{
    margin:0;
    font-size:12px;
    letter-spacing:.16em;
    color:var(--ink-3);
  }
  .rail-nav{
    display:flex;
    flex-direction:column;
    margin-top:12px;
    border-top:1px solid var(--line);
  }
  .rail-nav a{
    display:flex;
    align-items:baseline;
    gap:10px;
    padding:10px 0;
    border-bottom:1px solid var(--line);
    font-size:13.5px;
    color:var(--ink-2);
    text-decoration:none;
  }
  .rail-nav a span{
    font-size:11.5px;
    color:var(--ink-3);
    font-variant-numeric:tabular-nums;
  }
  .rail-nav a:hover{color:var(--ink)}
  .rail-nav a.is-active{color:var(--blue);font-weight:700}
  .rail-nav a.is-active span{color:var(--blue)}

  .rail-foot{
    display:flex;
    justify-content:space-between;
    margin-top:16px;
    padding-top:10px;
    border-top:1px solid var(--line);
    font-size:11.5px;
    color:var(--ink-3);
  }
  .rail-foot b{font-size:12px;color:var(--ink)}

  .flow{grid-template-columns:repeat(4,minmax(0,1fr))}
}

@media (min-width:1180px){
  .hero{padding:72px 0 80px}
  .doc-main{padding-top:58px}
  h1{font-size:76px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .btn{transition:none}
}

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