/* Geranium HARMONIC 75 — User Guide
   ------------------------------------------------------------ */

:root{
  --bg: #0f1512;
  --panel: #141d18;
  --panel-2: #182119;
  --line: rgba(231,232,221,0.10);
  --line-strong: rgba(231,232,221,0.16);
  --cream: #E7E8DD;
  --cream-dim: #b9bcae;
  --cream-faint: #8c9186;
  --sage: #87917E;
  --amber: #EFC57C;
  --amber-dim: #b99a5f;
  --mint: #89C5A3;
  --topbar-h: 60px;
  --sidebar-w: 288px;
  --ease: cubic-bezier(.19,1,.22,1);
}

*{ box-sizing:border-box; }
html{ background: var(--bg); scroll-behavior:smooth; }
body{
  margin:0; background: var(--bg); color: var(--cream);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; display:block; }
a{ color: inherit; }
::selection{ background: var(--amber); color: #211a0c; }
kbd{
  font: inherit; font-size: 11px; background: rgba(231,232,221,.08); border: 1px solid var(--line-strong);
  border-radius: 5px; padding: 2px 6px; color: var(--cream-dim);
}

.glow{
  position: fixed; width: 520px; height: 520px; border-radius:50%;
  background: radial-gradient(circle, rgba(239,197,124,0.07), rgba(137,197,163,0.04) 45%, transparent 70%);
  pointer-events:none; z-index: 1; left:0; top:0;
  will-change: transform;
}
@media (pointer:coarse){ .glow{ display:none; } }

/* ---------- Topbar ---------- */
.topbar{
  position: fixed; top:0; left:0; right:0; height: var(--topbar-h); z-index: 300;
  display:flex; align-items:center; gap:16px;
  padding: 0 18px;
  background: rgba(15,21,18,0.86); backdrop-filter: blur(16px) saturate(140%); -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--line);
}
.icon-btn{
  display:inline-flex; align-items:center; justify-content:center;
  width:36px; height:36px; border-radius:9px; background:transparent; border:1px solid transparent;
  color: var(--cream-dim); cursor:pointer;
}
.icon-btn:hover{ color: var(--cream); background: rgba(231,232,221,.06); }
.icon-btn svg{ width:20px; height:20px; }
.only-mobile{ display:none; }

.brand{ display:flex; align-items:center; gap:10px; text-decoration:none; flex-shrink:0; }
.brand img{ width:26px; height:26px; border-radius:7px; }
.brand-text{ display:flex; flex-direction:column; line-height:1.15; }
.brand-text strong{ font-size:13px; letter-spacing:.06em; color: var(--cream); }
.brand-text em{ font-style:normal; font-size:11px; letter-spacing:.08em; color: var(--sage); text-transform:uppercase; }

.search-trigger{
  display:flex; align-items:center; gap:10px; flex:1; max-width: 420px;
  background: rgba(231,232,221,.05); border:1px solid var(--line); border-radius:10px;
  padding: 8px 12px; color: var(--cream-faint); cursor:pointer; font-size:13px;
}
.search-trigger:hover{ border-color: var(--line-strong); color: var(--cream-dim); }
.search-trigger svg{ width:16px; height:16px; flex-shrink:0; }
.search-trigger span{ flex:1; text-align:left; }
.search-trigger kbd{ padding:1px 6px; }

.topbar-link{
  margin-left:auto; font-size:12px; letter-spacing:.06em; color: var(--cream-dim); text-decoration:none;
  border:1px solid var(--line); padding:8px 14px; border-radius:999px; white-space:nowrap; flex-shrink:0;
}
.topbar-link:hover{ color: var(--amber); border-color: rgba(239,197,124,.35); }

/* ---------- Shell / Sidebar ---------- */
.shell{ display:flex; padding-top: var(--topbar-h); min-height:100vh; }

.sidebar{
  position: fixed; top: var(--topbar-h); bottom:0; left:0; width: var(--sidebar-w);
  overflow-y:auto; padding: 18px 12px 60px;
  background: var(--panel); border-right:1px solid var(--line);
  z-index: 200;
}
.sidebar::-webkit-scrollbar{ width:8px; }
.sidebar::-webkit-scrollbar-thumb{ background: var(--line-strong); border-radius:4px; }

.side-home{
  display:flex; align-items:center; gap:10px; padding:9px 10px; border-radius:8px;
  text-decoration:none; color: var(--cream-dim); font-size:13.5px; font-weight:600; margin-bottom:10px;
}
.side-home svg{ width:17px; height:17px; }
.side-home.active, .side-home:hover{ background: rgba(239,197,124,.08); color: var(--amber); }

.side-cats{ display:flex; flex-direction:column; gap:2px; border-top:1px solid var(--line); padding-top:10px; }

.side-cat summary{
  display:flex; align-items:center; gap:10px; padding:9px 10px; border-radius:8px; cursor:pointer;
  font-size:12.5px; font-weight:700; letter-spacing:.02em; color: var(--cream-dim); list-style:none;
  user-select:none;
}
.side-cat summary::-webkit-details-marker{ display:none; }
.side-cat summary svg{ width:16px; height:16px; color: var(--sage); flex-shrink:0; }
.side-cat[open] summary svg{ color: var(--amber); }
.side-cat summary:hover{ background: rgba(231,232,221,.05); color: var(--cream); }
.side-cat summary::after{
  content:''; width:7px; height:7px; margin-left:auto; border-right:1.6px solid var(--sage); border-bottom:1.6px solid var(--sage);
  transform: rotate(-45deg); transition: transform .2s var(--ease);
}
.side-cat[open] summary::after{ transform: rotate(45deg); }

.side-cat ul{ list-style:none; margin:2px 0 8px; padding:0 0 0 18px; border-left:1px solid var(--line); }
.side-cat li{ margin:0; }
.side-cat a{
  display:block; padding:7px 12px; border-radius:7px; text-decoration:none; color: var(--cream-faint);
  font-size:13px; line-height:1.35;
}
.side-cat a:hover{ color: var(--cream); background: rgba(231,232,221,.05); }
.side-cat a.active{ color: var(--amber); background: rgba(239,197,124,.10); font-weight:600; }

.sidebar-backdrop{ display:none; }

/* ---------- Content ---------- */
.content{ flex:1; min-width:0; margin-left: var(--sidebar-w); padding: 56px clamp(20px,4vw,64px) 100px; }

/* Home */
.home-hero{ max-width: 760px; margin: 0 auto 56px; }
.home-hero .eyebrow{ font-size:12px; letter-spacing:.24em; text-transform:uppercase; color: var(--amber); font-weight:700; margin:0 0 14px; }
.home-hero h1{ font-size: clamp(32px,5vw,52px); line-height:1.06; margin:0 0 18px; letter-spacing:-0.01em; }
.home-lead{ font-size: clamp(17px,2vw,20px); color: var(--cream); margin:0 0 14px; font-weight:600; }
.home-p{ font-size:15.5px; line-height:1.7; color: var(--cream-dim); margin:0 0 12px; max-width:64ch; }
.home-version{ font-size:12.5px; color: var(--sage); margin: 18px 0 0; }
.home-cta{ display:flex; gap:14px; margin-top:26px; flex-wrap:wrap; }

.home-grid{
  display:grid; grid-template-columns: repeat(auto-fill, minmax(230px,1fr)); gap:16px;
  max-width: 1080px; margin: 0 auto;
}
.cat-card{
  display:flex; flex-direction:column; gap:10px; text-decoration:none;
  padding:20px; border-radius:14px; border:1px solid var(--line); background: var(--panel);
  transition: transform .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}
.cat-card:hover{ transform: translateY(-3px); border-color: rgba(239,197,124,.3); background: var(--panel-2); }
.cat-icon{ color: var(--amber); }
.cat-icon svg{ width:30px; height:30px; }
.cat-title{ font-size:15.5px; font-weight:700; color: var(--cream); }
.cat-desc{ font-size:13px; line-height:1.5; color: var(--cream-faint); flex:1; }
.cat-count{ font-size:11.5px; letter-spacing:.06em; text-transform:uppercase; color: var(--mint); }

.btn{
  display:inline-flex; align-items:center; gap:8px; padding:12px 22px; border-radius:999px;
  font-size:14px; font-weight:600; text-decoration:none; transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}
.btn.primary{ background: linear-gradient(180deg, var(--amber), var(--amber-dim)); color:#211a0c; box-shadow:0 10px 24px -8px rgba(239,197,124,.4); }
.btn.primary:hover{ transform: translateY(-2px); }
.btn.ghost{ color: var(--cream); border:1px solid var(--line-strong); }
.btn.ghost:hover{ border-color: rgba(231,232,221,.4); transform: translateY(-2px); }

/* Breadcrumb */
.breadcrumb{ max-width: 760px; margin: 0 auto 8px; font-size:12.5px; color: var(--cream-faint); display:flex; gap:8px; flex-wrap:wrap; }
.breadcrumb a{ text-decoration:none; color: var(--cream-faint); }
.breadcrumb a:hover{ color: var(--amber); }
.breadcrumb span:not(:last-child){ color: var(--line-strong); }
.breadcrumb span:last-child{ color: var(--cream-dim); }

/* Chapter article */
.chapter{ max-width: 760px; margin: 0 auto; }
.chap-num{ display:inline-block; font-size:11.5px; letter-spacing:.14em; text-transform:uppercase; color: var(--mint); font-weight:700; margin: 10px 0 8px; }
.chapter h1{ font-size: clamp(26px,4vw,38px); line-height:1.14; margin:0 0 22px; letter-spacing:-0.01em; }

.on-this-page{
  border:1px solid var(--line); border-radius:12px; padding:14px 18px; margin: 0 0 30px; background: var(--panel);
}
.on-this-page span{ display:block; font-size:11px; letter-spacing:.12em; text-transform:uppercase; color: var(--sage); font-weight:700; margin-bottom:8px; }
.on-this-page ul{ list-style:none; margin:0; padding:0; columns: 2; column-gap: 24px; }
.on-this-page li{ break-inside: avoid; }
.on-this-page a{ display:block; padding:3px 0; font-size:13.5px; color: var(--cream-dim); text-decoration:none; }
.on-this-page a:hover{ color: var(--amber); }

.chapter-body{ font-size:16px; line-height:1.75; color: var(--cream-dim); }
.chapter-body h3{
  font-size: 19px; color: var(--cream); margin: 40px 0 14px; padding-top:10px;
  border-top: 1px solid var(--line); letter-spacing:-0.005em; scroll-margin-top: calc(var(--topbar-h) + 20px);
}
.chapter-body h3:first-child{ border-top:none; padding-top:0; margin-top:0; }
.chapter-body p{ margin: 0 0 16px; }
.chapter-body p a{ color: var(--amber); text-decoration: underline; text-underline-offset: 2px; }
.chapter-body p a:hover{ color: var(--cream); }
.chapter-body ol, .chapter-body ul{ margin: 0 0 18px; padding-left: 1.35em; }
.chapter-body li{ margin: 0 0 8px; }
.chapter-body ol{ counter-reset: item; }
.chapter-body strong{ color: var(--cream); }

.chapter-body .deflist{ margin: 0 0 20px; display:grid; grid-template-columns: minmax(140px, 220px) 1fr; gap: 3px 18px; }
.chapter-body .deflist dt{ color: var(--cream); font-weight:600; padding: 8px 0; border-top:1px solid var(--line); }
.chapter-body .deflist dd{ margin:0; padding: 8px 0; border-top:1px solid var(--line); color: var(--cream-dim); }
.chapter-body .deflist dt:first-of-type, .chapter-body .deflist dd:first-of-type{ border-top:none; }

.table-wrap{ margin: 0 0 22px; overflow-x:auto; border:1px solid var(--line); border-radius:12px; }
.table-wrap table{ width:100%; border-collapse:collapse; font-size:14.5px; }
.table-wrap th, .table-wrap td{ text-align:left; padding:11px 16px; border-bottom:1px solid var(--line); vertical-align:top; }
.table-wrap th{ color: var(--mint); font-size:11.5px; letter-spacing:.08em; text-transform:uppercase; background: var(--panel-2); font-weight:700; }
.table-wrap td:first-child{ color: var(--cream); font-weight:600; white-space:nowrap; }
.table-wrap tr:last-child td{ border-bottom:none; }
.table-wrap td{ color: var(--cream-dim); }

figure.illus{
  margin: 22px 0 28px; padding:0; border-radius:14px; overflow:hidden;
  border:1px solid var(--line-strong); background: #d9dbcd;
  box-shadow: 0 20px 50px -20px rgba(0,0,0,.6);
}
figure.illus img{ width:100%; display:block; }
figure.illus figcaption{
  padding: 12px 16px; font-size:13px; color: var(--sage); background: var(--panel); line-height:1.5;
  border-top:1px solid var(--line);
}

/* Technical diagrams ------------------------------------------------------ */
.flow-diagram{
  margin: 24px 0 30px; padding: 0; border-radius:14px; border:1px solid var(--line);
  background: var(--panel); overflow:hidden;
}
.flow-diagram svg{ display:block; width:100%; height:auto; padding: 20px 22px; }
.flow-diagram > div{ overflow-x:auto; }
.flow-diagram figcaption{
  padding: 11px 18px; font-size:13px; color: var(--sage); line-height:1.5;
  border-top:1px solid var(--line); background: var(--panel-2);
}
.flow-diagram .fbox{ fill: var(--panel-2); stroke: var(--line-strong); }
.flow-diagram .fbox.accent{ stroke: var(--amber); }
.flow-diagram .fbox.mint{ stroke: var(--mint); }
.flow-diagram .fbox.soft{ fill: rgba(231,232,221,.03); stroke: var(--line); }
.flow-diagram .zone{ fill: rgba(231,232,221,.025); stroke: var(--line); stroke-dasharray: 4 5; }
.flow-diagram .zone.global{ fill: rgba(137,197,163,.05); stroke: rgba(137,197,163,.25); }
.flow-diagram text{ fill: var(--cream-dim); font-size:12.5px; font-family: inherit; }
.flow-diagram text.strong{ fill: var(--cream); font-weight:600; }
.flow-diagram text.dim{ fill: var(--cream-faint); }
.flow-diagram text.mintx{ fill: var(--mint); }
.flow-diagram .farrow{ stroke: var(--sage); stroke-width:1.6; fill:none; }
.flow-diagram .farrow.ctl{ stroke: var(--mint); stroke-dasharray: 3 4; }
.flow-diagram .farrow.ct{ stroke: var(--sage); stroke-dasharray: 2 3; stroke-width:1.2; }
.flow-diagram .farrow.clip{ stroke: var(--amber); stroke-width:1.4; stroke-dasharray: 3 4; }
.flow-diagram .axis{ stroke: var(--line-strong); stroke-width:1.2; }
.flow-diagram .axis.faint{ stroke: var(--line); stroke-dasharray: 3 4; }
.flow-diagram .keyline{ stroke: var(--mint); stroke-width:1.2; stroke-dasharray: 3 4; }
.flow-diagram .wave{ stroke: var(--amber); stroke-width:2; fill:none; stroke-linejoin:round; stroke-linecap:round; }
.flow-diagram .bar{ fill: var(--mint); opacity:.8; }
.flow-diagram .bar.soft{ fill: var(--amber); opacity:.7; }
.flow-diagram .step{ fill: rgba(231,232,221,.10); stroke: var(--line-strong); }
.flow-diagram .step.tie{ fill: rgba(239,197,124,.30); stroke: rgba(239,197,124,.5); }
.flow-diagram .step.rest{ fill: rgba(20,29,24,.9); stroke: var(--line-strong); }
.flow-diagram .bridge{ stroke: var(--mint); stroke-width:2; fill:none; }
.flow-diagram .gate{ fill: rgba(137,197,163,.16); stroke: rgba(137,197,163,.45); }

/* Prev/Next */
.chap-nav-row{ max-width:760px; margin: 56px auto 0; display:grid; grid-template-columns:1fr 1fr; gap:14px; }
.chap-nav{
  display:flex; flex-direction:column; gap:6px; padding:16px 18px; border-radius:12px; border:1px solid var(--line);
  text-decoration:none; background: var(--panel); transition: border-color .25s var(--ease), transform .25s var(--ease);
}
.chap-nav:hover{ border-color: rgba(239,197,124,.3); transform: translateY(-2px); }
.chap-nav.next{ text-align:right; align-items:flex-end; }
.chap-nav-dir{ font-size:11px; letter-spacing:.1em; text-transform:uppercase; color: var(--sage); font-weight:700; }
.chap-nav-title{ font-size:14px; color: var(--cream); }
.chap-nav.placeholder{ border-color:transparent; }

/* ---------- Search overlay ---------- */
.search-overlay{
  position: fixed; inset:0; z-index:500; background: rgba(8,11,9,.72); backdrop-filter: blur(6px);
  display:flex; align-items:flex-start; justify-content:center; padding: 10vh 20px;
}
.search-overlay[hidden]{ display:none; }
.search-panel{
  width:100%; max-width:640px; background: var(--panel); border:1px solid var(--line-strong); border-radius:16px;
  box-shadow: 0 40px 90px -20px rgba(0,0,0,.7); overflow:hidden;
}
.search-field{ display:flex; align-items:center; gap:10px; padding:16px 18px; border-bottom:1px solid var(--line); }
.search-field svg{ width:18px; height:18px; color: var(--sage); flex-shrink:0; }
.search-field input{
  flex:1; background:transparent; border:none; outline:none; color: var(--cream); font-size:16px;
  font-family: inherit;
}
.search-field input::placeholder{ color: var(--cream-faint); }

.search-results{ max-height: 60vh; overflow-y:auto; padding: 8px; }
.search-hit{ display:flex; flex-direction:column; gap:3px; padding:11px 14px; border-radius:10px; text-decoration:none; }
.search-hit:hover{ background: rgba(239,197,124,.08); }
.search-hit-cat{ font-size:10.5px; letter-spacing:.1em; text-transform:uppercase; color: var(--mint); font-weight:700; }
.search-hit-title{ font-size:14.5px; color: var(--cream); font-weight:600; }
.search-hit-snip{ font-size:12.5px; color: var(--cream-faint); line-height:1.4; }
.search-empty{ padding: 20px 14px; color: var(--cream-faint); font-size:14px; }

/* ---------- Responsive ---------- */
@media (max-width: 980px){
  .only-mobile{ display:inline-flex; }
  .search-trigger span, .search-trigger kbd{ display:none; }
  .search-trigger{ max-width:none; width:auto; padding:8px; }
  .topbar-link{ display:none; }

  .sidebar{
    transform: translateX(-100%); transition: transform .3s var(--ease);
    box-shadow: 30px 0 60px rgba(0,0,0,.4);
  }
  body.sidebar-open .sidebar{ transform: translateX(0); }
  .sidebar-backdrop{
    display:block; position:fixed; inset: var(--topbar-h) 0 0 0; background: rgba(0,0,0,.5);
    opacity:0; pointer-events:none; transition: opacity .3s var(--ease); z-index:190;
  }
  body.sidebar-open .sidebar-backdrop{ opacity:1; pointer-events:auto; }

  .content{ margin-left:0; padding-top:36px; }
  .on-this-page ul{ columns:1; }
  .chap-nav-row{ grid-template-columns:1fr; }
  .chap-nav.next{ text-align:left; align-items:flex-start; }
}

@media (max-width: 560px){
  .brand-text{ display:none; }
}