/* ============================================================
   Java Backend Field Notes — stylesheet
   Design: engineer's field-notebook. Dark ink ground, serif
   heads for the "notebook" voice, mono for code/labels/tabs.
   ============================================================ */

:root{
  --bg:        #0f1417;
  --bg-raised: #131a1e;
  --panel:     #161d21;
  --panel-2:   #1b2328;
  --border:    #263136;
  --border-soft: #1e282d;
  --text:      #e7edef;
  --text-dim:  #93a3aa;
  --text-faint:#5f6e75;
  --accent:    #4fb0a5;
  --accent-dim:#3a8078;
  --accent-ink:#0b1a18;
  --warm:      #d9a441;
  --warm-dim:  #8a6a2c;
  --danger:    #d97a6a;
  --code-bg:   #0b1012;
  --radius: 3px;
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--sans);
  font-size:15.5px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed; inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 28px 28px;
  z-index:0;
}

a{color:var(--accent); text-decoration:none;}
a:hover{text-decoration:underline;}
:focus-visible{outline:2px solid var(--accent); outline-offset:2px;}

/* ---------- Layout shell ---------- */
.shell{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns: 300px 1fr;
  min-height:100vh;
}

/* ---------- Sidebar ---------- */
.sidebar{
  border-right:1px solid var(--border);
  background:var(--panel);
  display:flex;
  flex-direction:column;
  height:100vh;
  position:sticky;
  top:0;
}
.brand{
  padding:22px 20px 16px;
  border-bottom:1px solid var(--border-soft);
}
.brand .stamp{
  display:inline-block;
  font-family:var(--mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:var(--accent);
  border:1px solid var(--accent-dim);
  padding:2px 7px;
  border-radius:2px;
  margin-bottom:10px;
  text-transform:uppercase;
}
.brand h1{
  font-family:var(--serif);
  font-size:19px;
  font-weight:600;
  margin:0 0 4px;
  line-height:1.25;
}
.brand p{
  margin:0;
  font-size:12px;
  color:var(--text-faint);
  font-family:var(--mono);
}

.author-link{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:8px;
  margin:12px 20px 0;
  padding:8px 12px;
  border:1px solid var(--border);
  border-radius:var(--radius);
  font-family:var(--mono);
  font-size:11.5px;
  color:var(--text-dim);
  background:var(--bg-raised);
}
.author-link:hover{
  color:var(--accent);
  border-color:var(--accent-dim);
  text-decoration:none;
}
.author-link .arrow{color:var(--text-faint); flex-shrink:0;}
.author-link:hover .arrow{color:var(--accent);}

.search-wrap{
  padding:14px 16px;
  border-bottom:1px solid var(--border-soft);
}
.search-wrap input{
  width:100%;
  background:var(--bg-raised);
  border:1px solid var(--border);
  color:var(--text);
  padding:8px 10px;
  border-radius:var(--radius);
  font-family:var(--mono);
  font-size:12.5px;
}
.search-wrap input::placeholder{color:var(--text-faint);}
.search-wrap input:focus{border-color:var(--accent-dim);}

.progress-wrap{
  padding:10px 16px 4px;
  font-family:var(--mono);
  font-size:10.5px;
  color:var(--text-faint);
  display:flex;
  justify-content:space-between;
}
.progress-track{
  height:3px;
  background:var(--border-soft);
  margin:0 16px 12px;
  border-radius:2px;
  overflow:hidden;
}
.progress-fill{
  height:100%;
  background:var(--accent);
  width:0%;
  transition:width .3s ease;
}

.nav{
  flex:1;
  overflow-y:auto;
  padding:6px 0 24px;
}
.nav::-webkit-scrollbar{width:8px;}
.nav::-webkit-scrollbar-thumb{background:var(--border); border-radius:4px;}

.nav-section{border-bottom:1px solid var(--border-soft);}
.nav-section-head{
  display:flex;
  align-items:center;
  gap:9px;
  width:100%;
  background:none;
  border:none;
  color:var(--text-dim);
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.08em;
  text-transform:uppercase;
  padding:12px 16px;
  cursor:pointer;
  text-align:left;
}
.nav-section-head .tab-dot{
  width:7px; height:7px; border-radius:50%;
  flex-shrink:0;
}
.nav-section-head .count{
  margin-left:auto;
  color:var(--text-faint);
  font-size:10px;
}
.nav-section-head .chev{
  transition:transform .15s ease;
  color:var(--text-faint);
  font-size:10px;
  width:10px;
}
.nav-section.open .chev{transform:rotate(90deg);}
.nav-list{
  list-style:none;
  margin:0; padding:0 0 8px;
  display:none;
}
.nav-section.open .nav-list{display:block;}
.nav-list li a{
  display:flex;
  align-items:baseline;
  gap:8px;
  padding:6px 16px 6px 30px;
  font-size:13px;
  color:var(--text-dim);
  border-left:2px solid transparent;
}
.nav-list li a .idx{
  font-family:var(--mono);
  font-size:10px;
  color:var(--text-faint);
  flex-shrink:0;
}
.nav-list li a:hover{
  color:var(--text);
  text-decoration:none;
  background:var(--panel-2);
}
.nav-list li a.active{
  color:var(--accent);
  border-left-color:var(--accent);
  background:var(--panel-2);
}
.nav-list li a.read .idx::after{
  content:" \2713";
  color:var(--accent-dim);
}

/* ---------- Main ---------- */
.main{
  min-width:0;
  padding: 48px 56px 120px;
  max-width: 920px;
}
.topbar{
  display:none;
}
.crumb{
  font-family:var(--mono);
  font-size:11px;
  color:var(--text-faint);
  letter-spacing:.05em;
  text-transform:uppercase;
  margin-bottom:14px;
}
.crumb span{color:var(--accent);}

.entry-head{
  border-bottom:1px solid var(--border);
  padding-bottom:22px;
  margin-bottom:30px;
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:20px;
}
.entry-head h1{
  font-family:var(--serif);
  font-size:32px;
  line-height:1.2;
  margin:0 0 8px;
}
.entry-head .tagline{
  color:var(--text-dim);
  font-size:14.5px;
  margin:0;
  max-width:60ch;
}
.mark-read{
  flex-shrink:0;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.05em;
  text-transform:uppercase;
  background:var(--bg-raised);
  border:1px solid var(--border);
  color:var(--text-dim);
  padding:8px 12px;
  border-radius:var(--radius);
  cursor:pointer;
}
.mark-read.on{
  border-color:var(--accent-dim);
  color:var(--accent);
  background:var(--accent-ink);
}

.content h2{
  font-family:var(--serif);
  font-size:22px;
  margin:34px 0 12px;
  padding-top:2px;
}
.content h3{
  font-family:var(--serif);
  font-size:17.5px;
  margin:26px 0 10px;
  color:var(--text);
}
.content p{margin:0 0 14px; color:#d7dee0;}
.content ul, .content ol{margin:0 0 16px; padding-left:22px; color:#d7dee0;}
.content li{margin-bottom:6px;}
.content strong{color:#fff; font-weight:600;}
.content blockquote{
  margin:18px 0;
  padding:12px 16px;
  border-left:3px solid var(--warm-dim);
  background:rgba(217,164,65,0.06);
  color:var(--text-dim);
  font-size:14px;
  border-radius:0 var(--radius) var(--radius) 0;
}
.content blockquote p:last-child{margin-bottom:0;}
.content code{
  font-family:var(--mono);
  background:var(--code-bg);
  padding:2px 5px;
  border-radius:2px;
  font-size:.87em;
  color:#c9d6d3;
}
.content pre{
  background:var(--code-bg);
  border:1px solid var(--border-soft);
  border-radius:var(--radius);
  padding:16px 18px;
  overflow-x:auto;
  margin:0 0 18px;
}
.content pre code{
  background:none;
  padding:0;
  font-size:12.8px;
  line-height:1.55;
}
.content table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 20px;
  font-size:13.5px;
}
.content th, .content td{
  border:1px solid var(--border-soft);
  padding:8px 10px;
  text-align:left;
}
.content th{
  background:var(--panel-2);
  font-family:var(--mono);
  font-size:11px;
  text-transform:uppercase;
  letter-spacing:.04em;
  color:var(--text-dim);
}
.content hr{border:none; border-top:1px solid var(--border-soft); margin:30px 0;}

.pager{
  display:flex;
  justify-content:space-between;
  margin-top:48px;
  padding-top:20px;
  border-top:1px solid var(--border-soft);
  gap:16px;
}
.pager a{
  flex:1;
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:12px 14px;
  color:var(--text-dim);
}
.pager a:hover{border-color:var(--accent-dim); text-decoration:none;}
.pager a .lbl{
  display:block;
  font-family:var(--mono);
  font-size:10px;
  text-transform:uppercase;
  letter-spacing:.06em;
  color:var(--text-faint);
  margin-bottom:4px;
}
.pager a.next{text-align:right;}

/* Home */
.home-hero{padding-top:6px;}
.home-hero .stamp{
  font-family:var(--mono);
  font-size:11px;
  color:var(--warm);
  letter-spacing:.12em;
  text-transform:uppercase;
}
.home-hero h1{
  font-family:var(--serif);
  font-size:38px;
  line-height:1.15;
  margin:12px 0 16px;
  max-width:16ch;
}
.home-hero p{
  color:var(--text-dim);
  font-size:15.5px;
  max-width:62ch;
  margin-bottom:28px;
}
.home-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit, minmax(230px,1fr));
  gap:14px;
  margin-top:10px;
}
.home-card{
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:18px;
  background:var(--panel);
  display:block;
}
.home-card:hover{border-color:var(--accent-dim); text-decoration:none;}
.home-card .n{
  font-family:var(--mono);
  font-size:11px;
  color:var(--text-faint);
}
.home-card h3{
  font-family:var(--serif);
  font-size:17px;
  margin:8px 0 6px;
  color:var(--text);
}
.home-card p{
  font-size:12.5px;
  color:var(--text-faint);
  margin:0;
}

.home-footer{
  margin-top:36px;
  padding-top:20px;
  border-top:1px solid var(--border-soft);
  font-size:12.5px;
  color:var(--text-faint);
}
.home-footer a{color:var(--text-dim);}
.home-footer a:hover{color:var(--accent);}

.empty{color:var(--text-faint); font-family:var(--mono); font-size:13px; padding-top:40px;}

.menu-toggle{
  display:none;
  position:fixed;
  top:14px; left:14px;
  z-index:20;
  background:var(--panel);
  border:1px solid var(--border);
  color:var(--text);
  width:42px; height:42px;
  border-radius:var(--radius);
  font-family:var(--mono);
  font-size:16px;
}

.backdrop{
  display:none;
  position:fixed; inset:0;
  background:rgba(0,0,0,0.55);
  z-index:14;
  opacity:0;
  pointer-events:none;
  transition:opacity .2s ease;
}
.backdrop.show{
  display:block;
  opacity:1;
  pointer-events:auto;
}

@media (max-width: 880px){
  .shell{grid-template-columns:1fr;}
  .sidebar{
    position:fixed; z-index:15;
    width:min(300px, 84vw);
    left:calc(-1 * min(300px, 84vw));
    transition:left .22s ease;
  }
  .sidebar.open{left:0;}
  .menu-toggle{display:flex; align-items:center; justify-content:center;}
  .main{padding:76px 20px 100px;}
  .entry-head{flex-direction:column; align-items:flex-start; gap:14px;}
  .entry-head h1{font-size:25px;}
  .mark-read{align-self:flex-start;}
  .home-hero h1{font-size:27px;}
  .home-hero p{font-size:14.5px;}

  /* larger touch targets for nav + pager on small screens */
  .nav-list li a{padding:10px 16px 10px 30px; font-size:14px;}
  .nav-section-head{padding:14px 16px;}
  .pager{flex-direction:column;}
  .pager a.next{text-align:left;}
}

@media (max-width: 480px){
  .main{padding:72px 14px 90px;}
  .entry-head h1{font-size:22px;}
  .home-hero h1{font-size:23px;}
  .content pre{padding:12px 14px;}
  .content pre code{font-size:12px;}
  .home-grid{grid-template-columns:1fr;}
  .author-link{margin:10px 14px 0;}
}

@media (prefers-reduced-motion: reduce){
  *{transition:none !important; scroll-behavior:auto !important;}
}