/* Mirror of Ages · 鉴往知来 — site styles */
:root{
  --paper:#f7f4ee; --ink:#2b2620; --sub:#6b6255;
  --bronze:#9a6b2f; --red:#a3372c; --line:#e2dbcd; --card:#fffdf8;
  --bronze-bg:#f0e8d8; --shadow:0 1px 2px rgba(43,38,32,.06),0 8px 24px rgba(43,38,32,.05);
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  background:var(--paper); color:var(--ink);
  font-family:"Microsoft YaHei","PingFang SC","Noto Sans SC",system-ui,sans-serif;
  font-size:15px; line-height:1.75;
}
a{color:var(--bronze); text-decoration:none;}
a:hover{text-decoration:underline;}
.container{max-width:1140px; margin:0 auto; padding:0 24px;}
.serif{font-family:"KaiTi","STKaiti","SimSun",serif;}

/* nav */
.nav{
  position:sticky; top:0; z-index:50; background:rgba(247,244,238,.92);
  backdrop-filter:blur(8px); border-bottom:1px solid var(--line);
}
.nav .container{display:flex; align-items:center; gap:26px; height:58px;}
.nav .brand{font-size:19px; font-weight:700; letter-spacing:1px; color:var(--ink); font-family:"KaiTi","SimSun",serif;}
.nav .brand em{font-style:normal; color:var(--bronze); font-size:13px; letter-spacing:.5px; margin-left:6px;}
.nav .links{display:flex; gap:20px; margin-left:auto; font-size:14px;}
.nav .links a{color:var(--sub);}
.nav .links a:hover{color:var(--ink); text-decoration:none;}

/* hero */
.hero{padding:64px 0 40px; border-bottom:1px solid var(--line);}
.hero h1{font-size:46px; letter-spacing:3px; font-family:"KaiTi","SimSun",serif; font-weight:700;}
.hero .en{color:var(--bronze); font-size:17px; letter-spacing:2px; margin-top:6px;}
.hero .tagline{font-size:18px; margin-top:16px; color:var(--ink);}
.hero .tagline .sm{color:var(--sub); font-size:14px; margin-left:10px;}
.hero .stats{display:flex; gap:36px; margin-top:26px; flex-wrap:wrap;}
.hero .stat b{font-size:26px; color:var(--bronze); font-family:"KaiTi","SimSun",serif;}
.hero .stat span{display:block; font-size:13px; color:var(--sub);}
.hero .cta{margin-top:28px; display:flex; gap:14px; flex-wrap:wrap;}

/* buttons */
.btn{
  display:inline-block; padding:10px 22px; border-radius:6px; font-size:15px;
  border:1px solid var(--bronze); cursor:pointer; transition:all .15s;
  background:var(--bronze); color:#fff; font-family:inherit;
}
.btn:hover{filter:brightness(1.08);}
.btn.ghost{background:transparent; color:var(--bronze);}
.btn.ghost:hover{background:var(--bronze-bg);}
.btn:disabled{opacity:.4; cursor:not-allowed;}
.btn.sm{padding:6px 14px; font-size:13px;}

/* sections */
section{padding:46px 0 10px;}
.sec-head{display:flex; align-items:baseline; gap:14px; margin-bottom:8px; flex-wrap:wrap;}
.sec-head h2{font-size:24px; font-family:"KaiTi","SimSun",serif; letter-spacing:1px;}
.sec-head .sub{color:var(--sub); font-size:13.5px;}
.sec-desc{color:var(--sub); font-size:13.5px; margin-bottom:20px;}

/* workspace */
.step{background:var(--card); border:1px solid var(--line); border-radius:8px; padding:20px 22px; margin-bottom:16px; box-shadow:var(--shadow);}
.step h3{font-size:16px; margin-bottom:10px; display:flex; align-items:center; gap:10px;}
.step h3 .no{
  width:24px; height:24px; border-radius:50%; background:var(--bronze); color:#fff;
  font-size:13px; display:inline-flex; align-items:center; justify-content:center;
}
textarea#situation{
  width:100%; min-height:110px; border:1px solid var(--line); border-radius:6px;
  padding:12px 14px; font:inherit; font-size:14.5px; line-height:1.7; background:#fff; resize:vertical;
}
textarea:focus{outline:2px solid var(--bronze-bg); border-color:var(--bronze);}
.hint{color:var(--sub); font-size:12.5px; margin-top:8px;}
.kchips{display:flex; flex-wrap:wrap; gap:8px; margin-top:14px;}
.chip{
  display:inline-flex; align-items:center; gap:6px; padding:4px 13px; border-radius:99px;
  background:var(--bronze-bg); color:#7a5220; border:1px solid #dcc9a6; font-size:13px; cursor:pointer;
  transition:all .12s; user-select:none;
}
.chip:hover{filter:brightness(.97);}
.chip.active{background:var(--bronze); color:#fff; border-color:var(--bronze);}
.chip .n{font-size:11px; opacity:.75;}
.chip.plain{background:#fff; cursor:default;}
.pickgrid{display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:12px; margin-top:14px;}
.pick{
  border:1.5px solid var(--line); border-radius:7px; padding:12px 14px; background:#fff; cursor:pointer;
  transition:all .12s;
}
.pick:hover{border-color:var(--bronze);}
.pick.on{border-color:var(--bronze); background:var(--bronze-bg); box-shadow:var(--shadow);}
.pick h4{font-size:14.5px; margin-bottom:4px;}
.pick .meta{font-size:12px; color:var(--sub);}
.pick .ex{font-size:12.5px; color:var(--sub); margin-top:6px; display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden;}
.report-actions{display:flex; gap:12px; margin:14px 0; flex-wrap:wrap;}
.report-panes{display:grid; grid-template-columns:1fr 1fr; gap:14px;}
.report-panes .pane{background:#fff; border:1px solid var(--line); border-radius:7px; overflow:hidden;}
.pane .pane-t{font-size:12.5px; color:var(--sub); padding:8px 14px; border-bottom:1px solid var(--line); background:#fbf9f3;}
.pane pre, .pane .rendered{
  padding:14px 18px; font-size:13px; line-height:1.8; max-height:520px; overflow:auto;
  white-space:pre-wrap; word-break:break-word;
}
.rendered h1{font-size:17px; margin:6px 0 10px;}
.rendered h2{font-size:15px; margin:14px 0 6px; color:var(--bronze);}
.rendered h3{font-size:14px; margin:10px 0 4px;}
.rendered ul{padding-left:20px;}
.rendered blockquote{border-left:3px solid var(--line); padding-left:12px; color:var(--sub); margin:8px 0;}
.rendered table{border-collapse:collapse; font-size:12.5px; margin:8px 0;}
.rendered th,.rendered td{border:1px solid var(--line); padding:4px 10px;}

/* library */
.toolbar{display:flex; gap:12px; flex-wrap:wrap; align-items:center; margin-bottom:16px;}
.toolbar input[type=search], .toolbar select{
  padding:9px 14px; border:1px solid var(--line); border-radius:6px; font:inherit; font-size:14px; background:#fff;
}
.toolbar input[type=search]{flex:1; min-width:220px;}
.casegrid{display:grid; grid-template-columns:repeat(auto-fill,minmax(320px,1fr)); gap:16px;}
.case-card{
  background:var(--card); border:1px solid var(--line); border-radius:8px; padding:16px 18px;
  cursor:pointer; transition:all .15s; box-shadow:var(--shadow);
}
.case-card:hover{transform:translateY(-2px); border-color:var(--bronze);}
.case-card .top{display:flex; justify-content:space-between; gap:8px; font-size:12px; color:var(--sub); margin-bottom:6px;}
.case-card .top .src{color:var(--bronze);}
.case-card h3{font-size:15.5px; margin-bottom:8px;}
.case-card .ex{font-size:13px; color:var(--sub); display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; min-height:44px;}
.case-card .ks{display:flex; gap:6px; flex-wrap:wrap; margin-top:10px;}
.kmini{font-size:11.5px; background:var(--bronze-bg); color:#7a5220; border-radius:99px; padding:2px 10px;}

/* kernels */
.kgrid{display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:14px;}
.kcard{background:var(--card); border:1px solid var(--line); border-radius:8px; padding:16px 18px; box-shadow:var(--shadow);}
.kcard h3{font-size:15.5px; color:var(--bronze); margin-bottom:4px; font-family:"KaiTi","SimSun",serif; letter-spacing:.5px;}
.kcard .d{font-size:13px; color:var(--sub); margin-bottom:10px;}
.kcard .terms{font-size:12px; color:#9b8f7c; margin-bottom:10px;}
.kcard .cs{display:flex; flex-wrap:wrap; gap:6px;}
.klink{font-size:12.5px; border:1px solid var(--line); border-radius:99px; padding:2px 10px; background:#fff; cursor:pointer;}
.klink:hover{border-color:var(--bronze); color:var(--bronze); text-decoration:none;}

/* modal */
.modal-mask{
  position:fixed; inset:0; background:rgba(43,38,32,.45); z-index:100;
  display:none; align-items:flex-start; justify-content:center; padding:40px 16px; overflow:auto;
}
.modal-mask.show{display:flex;}
.modal{
  background:var(--card); border-radius:10px; max-width:780px; width:100%; box-shadow:0 24px 64px rgba(0,0,0,.25);
}
.modal .m-head{display:flex; align-items:flex-start; gap:14px; padding:22px 26px 14px; border-bottom:1px solid var(--line);}
.modal .m-head h3{font-size:19px; font-family:"KaiTi","SimSun",serif;}
.modal .m-head .meta{font-size:12.5px; color:var(--sub); margin-top:4px;}
.modal .close{margin-left:auto; border:none; background:none; font-size:22px; cursor:pointer; color:var(--sub); line-height:1;}
.modal .m-body{padding:18px 26px 28px;}
.fitem{margin-bottom:14px;}
.fitem h4{font-size:13px; color:var(--bronze); margin-bottom:3px;}
.fitem p{font-size:14px; line-height:1.85;}
.fitem.quote-block{background:#f2ecdf; border-radius:6px; padding:12px 16px; font-family:"KaiTi","SimSun",serif;}
.fitem.quote-block p{font-size:14.5px; color:#4a3d28;}

/* footer */
footer{margin-top:60px; border-top:1px solid var(--line); padding:30px 0 44px; color:var(--sub); font-size:13px;}
footer .row{display:flex; justify-content:space-between; gap:20px; flex-wrap:wrap;}

@media (max-width:860px){
  .hero h1{font-size:34px;}
  .report-panes{grid-template-columns:1fr;}
  .nav .links{gap:12px; font-size:13px;}
}

/* AI settings form */
.fitem input, .fitem select{
  width:100%; padding:8px 12px; border:1px solid var(--line); border-radius:6px;
  font:inherit; font-size:13.5px; background:#fff; color:var(--ink);
}
.fitem input:focus, .fitem select:focus{outline:2px solid var(--bronze-bg); border-color:var(--bronze);}