/* ============================================================
   大模型提示词工程 · 培训/指南型静态站样式
   纯 CSS，无外部依赖；颜色全部走变量，支持浅色/深色双主题
   ============================================================ */

:root{
  --navy:#1F4E79; --blue:#2E75B6; --blue-soft:#EAF2FB; --blue-line:#BDD7EE;
  --green:#2E8B57; --green-soft:#EAF7EE; --amber:#C77700; --amber-soft:#FFF4E5;
  --ink:#232a31; --grey:#5a6672; --line:#e6ebf2; --bg:#f6f9fd; --card:#ffffff;
  --row-alt:#fafcff; --th-bg:#1F4E79; --th-ink:#ffffff;
  --code-bg:#2b3440; --code-ink:#e6edf3; --radius:14px; --shadow:0 6px 24px rgba(31,78,121,.08);
  --topbar-h:58px;
}
[data-theme="dark"]{
  --navy:#8fbdea; --blue:#5AA9E6; --blue-soft:#17293c; --blue-line:#2c4a68;
  --green:#4FB37D; --green-soft:#15281f; --amber:#E0A33E; --amber-soft:#2c2417;
  --ink:#e4eaf1; --grey:#9dabba; --line:#26313e; --bg:#0e141b; --card:#161e27;
  --row-alt:#1a232d; --th-bg:#1c344f; --th-ink:#eaf2fb; --code-bg:#0b1118; --code-ink:#d7e3ef;
  --shadow:0 6px 24px rgba(0,0,0,.4);
}

*{box-sizing:border-box;}
html{
  scroll-padding-top:calc(var(--topbar-h) + 18px);
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Segoe UI",system-ui,sans-serif;
  font-size:16px; line-height:1.75; color:var(--ink); background:var(--bg);
  -webkit-font-smoothing:antialiased; transition:background .3s ease,color .3s ease;
}
img{max-width:100%; display:block;}
a{color:var(--blue); text-decoration:none;}
a:hover{text-decoration:underline;}
code,kbd,pre{font-family:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;}
:focus-visible{outline:2px solid var(--blue); outline-offset:2px;}

/* ---------- 阅读进度条 ---------- */
#progress{
  position:fixed; top:0; left:0; height:3px; width:0;
  background:linear-gradient(90deg,var(--navy),var(--blue));
  z-index:1001; transition:width .1s linear;
}

/* ---------- 顶部栏 ---------- */
.topbar{
  position:sticky; top:0; height:var(--topbar-h); z-index:1000;
  display:flex; align-items:center; gap:14px;
  padding:0 18px;
  padding-left:max(18px,env(safe-area-inset-left));
  padding-right:max(18px,env(safe-area-inset-right));
  background:color-mix(in srgb,var(--card) 88%,transparent);
  backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex; align-items:center; gap:10px; min-width:0;}
.logo{
  width:30px; height:30px; border-radius:8px; flex:0 0 auto;
  background:linear-gradient(135deg,var(--navy),var(--blue));
  display:flex; align-items:center; justify-content:center;
  color:#fff; font-weight:800; font-size:15px;
  box-shadow:0 4px 12px rgba(31,78,121,.35);
}
.brand .title{font-weight:700; font-size:16px; color:var(--ink); white-space:nowrap; overflow:hidden; text-overflow:ellipsis;}
.topbar .spacer{flex:1 1 auto;}

.search{position:relative; display:flex; align-items:center;}
.search input{
  width:230px; max-width:42vw; height:36px; padding:0 12px 0 34px;
  border:1px solid var(--line); border-radius:999px; background:var(--bg);
  color:var(--ink); font-size:14px; transition:width .2s ease,border-color .2s;
}
.search input:focus{outline:none; border-color:var(--blue); width:280px;}
.search .ic{position:absolute; left:12px; font-size:14px; color:var(--grey); pointer-events:none;}
.search-btn{display:none;}

.icon-btn{
  width:38px; height:38px; flex:0 0 auto; border:1px solid var(--line); border-radius:10px;
  background:var(--bg); color:var(--ink); font-size:17px; cursor:pointer;
  display:flex; align-items:center; justify-content:center; transition:.2s;
}
.icon-btn:hover{border-color:var(--blue); color:var(--blue); transform:translateY(-1px);}
.menu-btn{display:none;}

/* 搜索结果下拉 */
.search-results{
  position:absolute; top:46px; right:0; width:min(420px,86vw);
  max-height:60vh; overflow:auto; background:var(--card); border:1px solid var(--line);
  border-radius:12px; box-shadow:var(--shadow); padding:6px; display:none; z-index:1002;
}
.search-results.open{display:block;}
.search-results .sr-empty{padding:14px; color:var(--grey); font-size:14px; text-align:center;}
.sr-item{padding:9px 11px; border-radius:9px; cursor:pointer; display:block; color:var(--ink);}
.sr-item:hover{background:var(--blue-soft); text-decoration:none;}
.sr-item .sr-sec{font-size:12px; color:var(--blue); font-weight:700; margin-bottom:2px;}
.sr-item .sr-snip{font-size:13px; color:var(--grey); line-height:1.5;
  display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden;}
.sr-item mark{background:var(--amber-soft); color:var(--ink); padding:0 2px; border-radius:3px; font-weight:700;}

/* ---------- 布局 ---------- */
.layout{display:flex; align-items:flex-start; max-width:1280px; margin:0 auto;}

/* 侧栏目录 */
.toc{
  position:sticky; top:calc(var(--topbar-h) + 14px);
  width:240px; flex:0 0 240px; align-self:flex-start;
  max-height:calc(100vh - var(--topbar-h) - 28px); overflow:auto;
  padding:22px 14px 40px 18px;
  padding-left:max(18px,env(safe-area-inset-left));
}
.toc h4{margin:0 0 10px; font-size:13px; letter-spacing:.08em; color:var(--grey); text-transform:uppercase;}
.toc a{
  display:block; padding:7px 10px; margin:2px 0; border-radius:8px;
  color:var(--grey); font-size:14px; border-left:3px solid transparent; transition:.15s;
}
.toc a:hover{background:var(--blue-soft); color:var(--ink); text-decoration:none;}
.toc a.active{color:var(--navy); background:var(--blue-soft); border-left-color:var(--blue); font-weight:700;}
.toc a.sub{font-size:13px; padding-left:22px; color:var(--grey);}

/* 主内容 */
.content{flex:1 1 auto; min-width:0; padding:26px 26px 80px;
  padding-right:max(26px,env(safe-area-inset-right));}
.content > section{
  scroll-margin-top:calc(var(--topbar-h) + 18px);
  margin-bottom:38px;
}

/* ---------- Hero ---------- */
.hero{
  position:relative; overflow:hidden;
  background:linear-gradient(135deg,var(--navy),var(--blue));
  color:#fff; border-radius:var(--radius); padding:48px 40px;
  box-shadow:var(--shadow); margin-bottom:30px;
}
.hero::after{
  content:""; position:absolute; right:-60px; top:-60px; width:260px; height:260px;
  background:radial-gradient(circle,rgba(255,255,255,.16),transparent 70%);
}
.hero .badge{
  display:inline-block; padding:5px 13px; border-radius:999px; font-size:13px; font-weight:700;
  background:rgba(255,255,255,.18); border:1px solid rgba(255,255,255,.35); margin-bottom:16px;
}
.hero h1{
  margin:0 0 12px; font-size:clamp(28px,5vw,46px); line-height:1.2; font-weight:800; letter-spacing:.5px;
}
.hero p.lead{margin:0 0 22px; font-size:clamp(15px,2.2vw,19px); color:#dbe8f6; max-width:680px;}
.hero .cta{display:flex; gap:12px; flex-wrap:wrap; position:relative; z-index:1;}
.btn{
  display:inline-flex; align-items:center; gap:8px; padding:11px 22px; border-radius:10px;
  font-size:15px; font-weight:700; cursor:pointer; border:1px solid transparent; transition:.2s;
}
.btn-primary{background:#fff; color:var(--navy);}
.btn-primary:hover{transform:translateY(-2px); box-shadow:0 8px 22px rgba(0,0,0,.2); text-decoration:none;}
.btn-ghost{background:rgba(255,255,255,.12); color:#fff; border-color:rgba(255,255,255,.4);}
.btn-ghost:hover{background:rgba(255,255,255,.22); text-decoration:none;}
.hero .meta{display:flex; flex-wrap:wrap; gap:18px; margin-top:24px; font-size:13px; color:#cfe0f2; position:relative; z-index:1;}
.hero .meta span{display:inline-flex; align-items:center; gap:6px;}

/* ---------- 章节排版 ---------- */
.chap{font-size:clamp(22px,3.4vw,30px); font-weight:800; color:var(--ink); margin:8px 0 6px;
  padding-left:14px; border-left:5px solid var(--blue); line-height:1.3;}
.sub{font-size:clamp(17px,2.4vw,21px); font-weight:700; color:var(--navy); margin:26px 0 8px;}
.lead{font-size:16px; color:var(--grey); margin:0 0 16px;}
p{margin:0 0 14px;}
ol,ul{padding-left:22px; margin:0 0 14px;}
li{margin:6px 0;}
hr{border:none; border-top:1px solid var(--line); margin:30px 0;}

/* ---------- 卡片网格 ---------- */
.grid{display:grid; gap:16px; margin:18px 0;}
.grid.cols2{grid-template-columns:repeat(2,1fr);}
.grid.cols3{grid-template-columns:repeat(3,1fr);}
.card{
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:20px; box-shadow:var(--shadow); transition:transform .2s ease,box-shadow .2s ease,border-color .2s;
}
.card:hover{transform:translateY(-4px); box-shadow:0 12px 30px rgba(31,78,121,.16); border-color:var(--blue-line);}
.card .c-ico{font-size:26px; margin-bottom:8px;}
.card h3{margin:0 0 6px; font-size:17px; color:var(--ink);}
.card p{margin:0; font-size:14px; color:var(--grey);}
.card .tag{display:inline-block; margin-top:10px; font-size:12px; font-weight:700; color:var(--blue);
  background:var(--blue-soft); padding:3px 10px; border-radius:999px;}

/* ---------- 提示框 ---------- */
.callout{
  display:flex; gap:12px; padding:14px 16px; border-radius:12px; margin:16px 0;
  border-left:5px solid var(--blue); background:var(--blue-soft);
}
.callout .c-emoji{font-size:20px; flex:0 0 auto; line-height:1.5;}
.callout .c-body{font-size:14.5px; color:var(--ink);}
.callout .c-body strong{display:block; margin-bottom:2px;}
.callout.tip{border-color:var(--green); background:var(--green-soft);}
.callout.warning{border-color:var(--amber); background:var(--amber-soft);}
.callout.note{border-color:var(--blue); background:var(--blue-soft);}

/* ---------- 标签页 ---------- */
.tabs{display:flex; flex-wrap:wrap; gap:6px; margin:18px 0 0; border-bottom:1px solid var(--line);}
.tab{
  padding:9px 16px; border:1px solid transparent; border-bottom:none; border-radius:10px 10px 0 0;
  background:transparent; color:var(--grey); font-size:14px; font-weight:600; cursor:pointer; transition:.15s;
}
.tab:hover{color:var(--ink);}
.tab.active{color:var(--navy); background:var(--card); border-color:var(--line); position:relative; top:1px;}
.panels{background:var(--card); border:1px solid var(--line); border-top:none; border-radius:0 0 12px 12px; padding:18px; margin-bottom:18px;}
.panel{display:none;}
.panel.active{display:block; animation:fade .25s ease;}
@keyframes fade{from{opacity:0; transform:translateY(6px);} to{opacity:1; transform:none;}}
.panel h4{margin:0 0 8px; color:var(--navy); font-size:16px;}
.panel pre{margin:10px 0 0;}

/* ---------- 代码块 / Prompt 卡 ---------- */
pre{
  background:var(--code-bg); color:var(--code-ink); border-radius:10px; padding:14px 16px;
  overflow:auto; font-size:13.5px; line-height:1.65; margin:14px 0;
}
pre code{color:inherit; background:none; padding:0; font-size:inherit;}

/* Prompt 速查卡 */
.prompt-card{
  position:relative; background:var(--card); border:1px solid var(--line); border-radius:12px;
  padding:16px 16px 14px; margin:14px 0; box-shadow:var(--shadow);
}
.prompt-card .pc-title{font-size:14px; font-weight:700; color:var(--navy); margin-bottom:8px;}
.prompt-card pre{margin:0; background:var(--code-bg);}
.copy-btn{
  position:absolute; top:10px; right:10px; z-index:2;
  border:1px solid var(--line); background:var(--bg); color:var(--ink);
  font-size:12px; font-weight:600; padding:4px 10px; border-radius:8px; cursor:pointer; transition:.15s;
}
.copy-btn:hover{border-color:var(--blue); color:var(--blue);}
.copy-btn.done{background:var(--green-soft); color:var(--green); border-color:var(--green);}

/* ---------- 表格 ---------- */
.table-wrap{margin:16px 0; overflow-x:auto; border:1px solid var(--line); border-radius:12px;}
.table-wrap table{width:100%; border-collapse:collapse; font-size:14px; min-width:520px;}
.table-wrap caption{caption-side:bottom; font-size:12px; color:var(--grey); padding:8px; text-align:center;}
.table-wrap th,.table-wrap td{padding:11px 14px; text-align:left; border-bottom:1px solid var(--line);}
.table-wrap th{background:var(--th-bg); color:var(--th-ink); font-weight:700; position:sticky; top:0;}
.table-wrap tbody tr:nth-child(even){background:var(--row-alt);}
.table-wrap td code{background:var(--blue-soft); color:var(--navy); padding:1px 6px; border-radius:5px; font-size:12.5px;}
.table-hint{display:none; font-size:12px; color:var(--grey); text-align:center; margin:-6px 0 14px;}

/* ---------- FAQ ---------- */
.faq{border:1px solid var(--line); border-radius:12px; background:var(--card); margin:12px 0; overflow:hidden;}
.faq summary{
  cursor:pointer; padding:15px 18px; font-weight:600; color:var(--ink); list-style:none;
  display:flex; align-items:center; justify-content:space-between; gap:10px;
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:"+"; font-size:20px; color:var(--blue); flex:0 0 auto;}
.faq[open] summary::after{content:"\2212";}
.faq .faq-body{padding:0 18px 16px; color:var(--grey); font-size:14.5px;}

/* ---------- 图片灯箱 ---------- */
.inst-img{margin:16px 0; cursor:zoom-in; border:1px solid var(--line); border-radius:12px; padding:10px; background:var(--card); box-shadow:var(--shadow);}
.inst-img img{width:100%; height:auto; border-radius:8px;}
.inst-img figcaption{font-size:13px; color:var(--grey); text-align:center; margin-top:8px;}
#lightbox{
  position:fixed; inset:0; z-index:2000; background:rgba(15,22,30,.86);
  display:none; align-items:center; justify-content:center; padding:24px;
}
#lightbox.open{display:flex;}
#lightbox img{max-width:94vw; max-height:90vh; border-radius:10px; box-shadow:0 20px 60px rgba(0,0,0,.5);}
#lightbox .lb-close{position:absolute; top:18px; right:22px; color:#fff; font-size:30px; cursor:pointer; line-height:1;}

/* ---------- 练习清单 ---------- */
.exercise{border:1px solid var(--blue-line); border-radius:12px; background:var(--blue-soft); padding:8px 16px 14px; margin:16px 0;}
.exercise ul{list-style:none; padding:0; margin:8px 0 0;}
.exercise li{display:flex; align-items:flex-start; gap:10px; padding:7px 0; border-bottom:1px dashed var(--blue-line);}
.exercise li:last-child{border-bottom:none;}
.exercise input[type=checkbox]{width:18px; height:18px; margin-top:4px; accent-color:var(--green); flex:0 0 auto; cursor:pointer;}
.exercise label{cursor:pointer; font-size:14.5px; color:var(--ink);}
.exercise input:checked + label{color:var(--grey); text-decoration:line-through;}
.progress-pill{margin-left:auto; font-size:12px; font-weight:700; color:var(--green); background:var(--green-soft); padding:2px 10px; border-radius:999px;}

/* ---------- 资源附录 ---------- */
.res-list{display:grid; gap:10px;}
.res-item{display:flex; gap:12px; align-items:center; padding:13px 16px; border:1px solid var(--line); border-radius:12px; background:var(--card);}
.res-item .r-ico{font-size:20px; flex:0 0 auto;}
.res-item a{font-weight:600;}

/* ---------- 回到顶部 ---------- */
#toTop{
  position:fixed; right:22px; bottom:22px;
  bottom:max(22px,env(safe-area-inset-bottom));
  width:46px; height:46px; border-radius:50%; border:none; cursor:pointer;
  background:linear-gradient(135deg,var(--navy),var(--blue)); color:#fff; font-size:20px;
  box-shadow:0 8px 22px rgba(31,78,121,.4); opacity:0; visibility:hidden; transition:.25s; z-index:900;
}
#toTop.show{opacity:1; visibility:visible;}
#toTop:hover{transform:translateY(-3px);}

/* ---------- 抽屉遮罩 ---------- */
.backdrop{position:fixed; inset:0; background:rgba(15,22,30,.45); z-index:999; display:none;}
.backdrop.open{display:block;}

/* ---------- 闪烁定位动画 ---------- */
.flash{animation:flash 1.4s ease;}
@keyframes flash{0%,100%{background:transparent;} 25%,60%{background:var(--amber-soft);}}

/* ============================================================
   移动端适配
   ============================================================ */
@media (max-width:980px){
  .toc{
    position:fixed; top:0; left:0; bottom:0; width:80vw; max-width:300px; z-index:1001;
    background:var(--card); border-right:1px solid var(--line); padding-top:calc(var(--topbar-h) + 16px);
    transform:translateX(-100%); transition:transform .25s ease; box-shadow:var(--shadow);
    max-height:none;
  }
  body.toc-open .toc{transform:translateX(0);}
  .menu-btn{display:flex;}
  .content{padding:20px 18px 70px;}
  .grid.cols3{grid-template-columns:repeat(2,1fr);}
  .brand .title{display:none;}
  .search input{width:150px;}
  .search input:focus{width:180px;}
}
@media (max-width:640px){
  .topbar{gap:8px; padding:0 12px;}
  .search input{display:none;}
  .search input:focus{display:block; width:60vw;}
  .search-btn{display:flex;}
  .hero{padding:32px 22px;}
  .grid.cols2,.grid.cols3{grid-template-columns:1fr;}
  .btn{width:100%; justify-content:center;}
  .table-hint{display:block;}
  .content{padding:16px 13px 60px;}
}

/* ============================================================
   打印
   ============================================================ */
@media print{
  .topbar,.toc,.backdrop,#progress,#toTop,.search,.icon-btn,.menu-btn,#lightbox{display:none !important;}
  body{background:#fff; color:#000;}
  .layout{display:block;}
  .content{max-width:none; padding:0;}
  .callout,.card,.prompt-card,.faq,.table-wrap,.inst-img{break-inside:avoid;}
  .faq{display:block !important;}
  details.faq{open:true;}
  details.faq summary::after{content:"";}
  pre{background:#f1f1f1 !important; color:#000 !important; -webkit-print-color-adjust:exact; print-color-adjust:exact;}
  .hero{background:#1F4E79 !important; -webkit-print-color-adjust:exact; print-color-adjust:exact;}
  a{color:#000; text-decoration:underline;}
  .prompt-card .copy-btn{display:none;}
}