/* ===== Theme tokens ===== */
:root{
  --bg:#0f1115; --panel:#161a21; --panel2:#1c212b; --line:#2a303c;
  --fg:#e7eaef; --dim:#9aa4b2; --accent:#d9a441; --hl:#f5c518;
  --mark-bg:rgba(245,197,24,.28); --code:#0b0d11;
  --shadow:0 8px 30px rgba(0,0,0,.45);
}
[data-theme="light"]{
  --bg:#f6f5f1; --panel:#ffffff; --panel2:#f0efe9; --line:#e2e0d8;
  --fg:#23272e; --dim:#6b7280; --accent:#b07d24; --hl:#8a5a00;
  --mark-bg:rgba(217,164,65,.35); --code:#f2f1ec;
  --shadow:0 8px 30px rgba(0,0,0,.10);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; background:var(--bg); color:var(--fg);
  font-family:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  font-size:16px; line-height:1.75; -webkit-font-smoothing:antialiased;
}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
input{font:inherit;color:var(--fg)}

.app{display:flex;height:100vh;height:100dvh;overflow:hidden}

/* ===== Sidebar ===== */
.sidebar{
  width:320px;min-width:260px;flex:0 0 auto;display:flex;flex-direction:column;
  background:var(--panel);border-right:1px solid var(--line);z-index:40;
}
.sb-head{display:flex;align-items:center;gap:10px;padding:14px 16px;border-bottom:1px solid var(--line)}
.brand{cursor:pointer;user-select:none}
.brand:hover .sb-title{color:var(--accent)}
.logo{width:30px;height:30px;flex:0 0 auto;border-radius:6px;display:block}
.sb-title{font-size:17px;font-weight:600;letter-spacing:.5px}

.search-row{display:flex;gap:8px;padding:12px 14px;border-bottom:1px solid var(--line)}
.tree-filter{
  flex:1;background:var(--panel2);border:1px solid var(--line);border-radius:9px;
  padding:8px 11px;font-size:14px;outline:none;min-width:0;
}
.tree-filter:focus{border-color:var(--accent)}

.tree{flex:1;overflow-y:auto;padding:8px 6px 40px}
.tree-node{user-select:none}
.tn-row{
  display:flex;align-items:center;gap:6px;padding:7px 9px;border-radius:8px;cursor:pointer;
  font-size:14.5px;color:var(--fg);line-height:1.35;
}
.tn-row:hover{background:var(--panel2)}
.tn-row.active{background:var(--accent);color:#1a1206;font-weight:600}
.tn-caret{width:14px;flex:0 0 auto;color:var(--dim);font-size:11px;transition:transform .15s}
.tree-node.open>.tn-row .tn-caret{transform:rotate(90deg)}
.tn-name{min-width:0;overflow-wrap:anywhere;word-break:break-word;line-height:1.35}
.tn-kids{display:none;margin-left:14px;border-left:1px solid var(--line);padding-left:2px}
.tree-node.open>.tn-kids,.tree-node.leaf>.tn-kids{display:block}
.tree-node.leaf>.tn-row .tn-caret{visibility:hidden}
.tn-count{margin-left:auto;font-size:11px;color:var(--dim);flex:0 0 auto;padding-left:8px}
.tn-row.active .tn-count{color:#5a4413}
.tree-empty{padding:20px;color:var(--dim);font-size:14px;text-align:center}

.sb-foot{padding:10px 16px;border-top:1px solid var(--line);font-size:12px;color:var(--dim)}

/* ===== Scrim (mobile) ===== */
.scrim{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:35}

/* ===== Content ===== */
.content{flex:1;display:flex;flex-direction:column;min-width:0;position:relative}
.topbar{
  display:flex;align-items:center;gap:12px;padding:12px 20px;
  border-bottom:1px solid var(--line);background:var(--panel);z-index:20;
}
.menu-btn{display:none;width:40px;height:40px;border-radius:9px;color:var(--dim)}
.menu-btn:hover{background:var(--panel2);color:var(--fg)}
.crumb{flex:1;font-size:14px;color:var(--dim);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.crumb b{color:var(--fg);font-weight:600}
.theme-btn{width:38px;height:38px;display:grid;place-items:center;border-radius:9px;color:var(--dim);flex:0 0 auto}
.theme-btn:hover{background:var(--panel2);color:var(--fg)}
[data-theme="dark"] .ic-sun{display:none}
[data-theme="light"] .ic-moon{display:none}

/* ===== TOC ===== */
.toc-wrap{position:absolute;top:60px;right:20px;background:var(--panel);border:1px solid var(--line);border-radius:9px;box-shadow:var(--shadow);z-index:30;overflow:hidden}
.toc-toggle{width:100%;text-align:left;padding:7px 12px;font-size:13px;font-weight:600;display:flex;justify-content:space-between;align-items:center;gap:4px;line-height:1.2;white-space:nowrap}
.toc-caret{transition:transform .2s;color:var(--dim);font-size:10px}
.toc-wrap.collapsed .toc-caret{transform:rotate(-90deg)}
.toc-list{list-style:none;margin:0;padding:4px 8px 10px;max-height:52vh;overflow-y:auto;width:240px}
.toc-wrap.collapsed .toc-list{display:none}
.toc-list li a{display:block;padding:6px 9px;font-size:13.5px;color:var(--dim);border-radius:7px;text-decoration:none;line-height:1.4}
.toc-list li a:hover{background:var(--panel2);color:var(--fg)}
.toc-list .l2 a{padding-left:20px;font-size:13px}

/* ===== Search bar ===== */
.search-bar{display:flex;gap:8px;padding:14px 20px;border-bottom:1px solid var(--line);background:var(--panel)}
.ft-input{flex:1;background:var(--panel2);border:1px solid var(--line);border-radius:9px;padding:9px 13px;font-size:15px;outline:none}
.ft-input:focus{border-color:var(--accent)}
.btn-go{padding:0 20px;border-radius:9px;background:var(--accent);color:#1a1206;font-weight:600}

/* ===== Reader / markdown ===== */
.reader{flex:1;overflow-y:auto;padding:34px 48px 80px;scroll-behavior:smooth}
.reader-inner{max-width:760px;margin:0 auto}

/* constrain every image so large source files never blow out the layout */
.reader-inner img{max-width:100%;height:auto;display:block;margin:.6em auto;border-radius:8px}

/* special interactive apps (八字测算 / 转换工具) rendered as full-bleed iframe */
.reader:has(.app-frame){position:relative;overflow:hidden;padding:20px 0 0 0;display:flex;flex-direction:column}
.app-frame{width:100%;flex:1;border:0;display:block;background:#fff;min-height:0}
.md h1,.md h2,.md h3,.md h4{line-height:1.35;margin:1.6em 0 .6em;font-weight:700;scroll-margin-top:20px}
.md h1{font-size:1.9em;margin-top:.2em;padding-bottom:.35em;border-bottom:1px solid var(--line)}
.md h2{font-size:1.45em;color:var(--fg);padding-left:10px;border-left:3px solid var(--accent)}
.md h3{font-size:1.2em}
.md h4{font-size:1.05em;color:var(--dim)}
.md p{margin:.9em 0}
.md a{color:var(--accent);text-decoration:none;border-bottom:1px solid transparent}
.md a:hover{border-bottom-color:var(--accent)}
.md strong{font-weight:700}
.md em{font-style:italic}
.md del{opacity:.6}
.md ul,.md ol{margin:.8em 0;padding-left:1.5em}
.md li{margin:.35em 0}
.md blockquote{margin:1em 0;padding:.4em 1em;border-left:3px solid var(--accent);background:var(--panel2);border-radius:0 8px 8px 0;color:var(--dim)}
.md code{font-family:"Cascadia Code",Consolas,monospace;font-size:.9em;background:var(--code);padding:2px 6px;border-radius:5px}
.md pre{background:var(--code);border:1px solid var(--line);border-radius:10px;padding:14px 16px;overflow-x:auto;margin:1em 0}
.md pre code{background:none;padding:0}
.md img{max-width:100%;height:auto;display:block;margin:1.2em auto;border-radius:8px}
.md table{border-collapse:collapse;width:100%;margin:1em 0;font-size:.95em}
.md th,.md td{border:1px solid var(--line);padding:8px 12px;text-align:left}
.md th{background:var(--panel2);font-weight:600}
.md hr{border:none;border-top:1px solid var(--line);margin:2em 0}
.md mark{background:var(--mark-bg);color:inherit;padding:0 2px;border-radius:3px}

/* ===== tile / app grid (homepage) ===== */
.grid-3col{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:1.4em 0}
@media (max-width:760px){.grid-3col{grid-template-columns:repeat(2,1fr)}}
@media (max-width:480px){.grid-3col{grid-template-columns:1fr}}
.grid-card{
  background:var(--panel2);border:1px solid var(--line);border-radius:12px;overflow:hidden;
  transition:border-color .15s,transform .15s;min-height:96px;display:flex;align-items:center;justify-content:center;
}
.grid-card:hover{border-color:var(--accent);transform:translateY(-2px)}
.grid-card a{display:block;width:100%;text-decoration:none;color:inherit;padding:14px;text-align:center;font-size:15px;line-height:1.5}
.grid-card img{width:100%;height:auto;display:block;border-radius:0 0 12px 12px}

/* ===== Pager ===== */
.pager{display:flex;align-items:center;justify-content:center;gap:16px;padding:14px 20px;border-top:1px solid var(--line);background:var(--panel)}
.pg-btn{padding:8px 16px;border-radius:9px;background:var(--panel2);border:1px solid var(--line);font-size:14px}
.pg-btn:hover:not(:disabled){color:var(--accent);border-color:var(--accent)}
.pg-btn:disabled{opacity:.35;cursor:default}
.pg-info{font-size:13.5px;color:var(--dim)}

/* ===== Search results ===== */
.sr-item{padding:14px 0;border-bottom:1px solid var(--line)}
.sr-path{font-size:12.5px;color:var(--accent);margin-bottom:6px;display:flex;align-items:center;gap:6px}
.sr-path a{text-decoration:none}
.sr-text{font-size:14.5px;color:var(--fg);line-height:1.7}
.sr-count{padding:8px 0 24px;color:var(--dim);font-size:13.5px;text-align:center}

.hidden{display:none!important}

/* ===== Search modal ===== */
.modal{position:fixed;inset:0;z-index:60;display:flex;align-items:flex-start;justify-content:center;padding-top:14vh;background:rgba(0,0,0,.55);backdrop-filter:blur(2px)}
.modal-box{width:min(560px,92vw);background:var(--panel);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);overflow:hidden}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--line)}
.modal-title{font-size:15px;font-weight:600}
.modal-head .icon-btn{width:32px;height:32px;display:grid;place-items:center;border-radius:8px;color:var(--dim);font-size:16px}
.modal-head .icon-btn:hover{background:var(--panel2);color:var(--fg)}
.modal-body{display:flex;gap:8px;padding:16px 18px}
.modal-body .ft-input{flex:1;background:var(--panel2);border:1px solid var(--line);border-radius:9px;padding:10px 13px;font-size:15px;outline:none}
.modal-body .ft-input:focus{border-color:var(--accent)}
.modal-body .btn-go{padding:0 22px;border-radius:9px;background:var(--accent);color:#1a1206;font-weight:600}

/* ===== Scrollbars ===== */
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:var(--line);border-radius:6px;border:2px solid transparent;background-clip:content-box}
::-webkit-scrollbar-thumb:hover{background:var(--dim)}

/* ===== Responsive ===== */
@media (max-width:900px){
  .sidebar{position:fixed;left:0;top:0;bottom:0;width:min(85vw,340px);transform:translateX(-100%);transition:transform .25s ease;box-shadow:var(--shadow)}
  body.nav-open .sidebar{transform:translateX(0)}
  body.nav-open .scrim{display:block}
  .menu-btn{display:grid;place-items:center}
  .reader{padding:24px 20px 80px}
  .toc-wrap{top:58px;right:12px}
  .toc-list{width:min(70vw,220px)}
}
@media (max-width:520px){
  body{font-size:15px}
  .reader{padding:18px 14px 80px}
  .md h1{font-size:1.6em}
  .sb-title{font-size:16px}
}