/* ============================================================
   Tokens
============================================================ */
:root{
  --paper: #F5F3EE;
  --paper-2: #FFFFFF;
  --ink: #1B1E23;
  --ink-dim: #6B6E73;
  --ink-faint: #9B9C97;
  --line: #DEDACE;
  --line-strong: #C7C2B3;
  --accent: #2447C4;
  --accent-ink: #EFF2FF;
  --sidebar-bg: #1B1E23;
  --sidebar-ink: #EDEDEA;
  --sidebar-ink-dim: #9AA0AC;
  --sidebar-line: #2E323A;

  --cat-modeling: #2447C4;
  --cat-mograph: #B4531D;
  --cat-redshift: #A32B2B;
  --cat-nodes: #6449B8;
  --cat-fields: #1E8A6E;
  --cat-materials: #A6790A;
  --cat-volumes: #2E7CA6;
  --cat-sim: #9A3D68;
  --cat-workflow: #5B6168;
  --cat-other: #8A8471;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin:0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
}

.mono{ font-family: var(--font-mono); }
.dim{ color: var(--ink-faint); }

/* ============================================================
   App shell
============================================================ */
.app{
  display:flex;
  min-height:100vh;
}

/* ============================================================
   Sidebar
============================================================ */
.sidebar{
  width: 350px;
  flex-shrink:0;
  background: var(--sidebar-bg);
  color: var(--sidebar-ink);
  display:flex;
  flex-direction:column;
  height:100vh;
  position:sticky;
  top:0;
  border-right: 1px solid #000;
}

.sidebar-head{
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  padding: 22px 20px 16px;
  border-bottom: 1px solid var(--sidebar-line);
}

.brand{ display:flex; gap:10px; align-items:flex-start; }
.brand-mark{
  color: #E8A15B;
  font-size: 18px;
  line-height: 1.4;
}
.brand-title{
  font-family: var(--font-display);
  font-weight:600;
  font-size: 16.5px;
  letter-spacing: 0.01em;
}
.brand-sub{
  font-size: 12px;
  color: var(--sidebar-ink-dim);
  margin-top:2px;
  font-family: var(--font-mono);
}

.sidebar-close{
  display:none;
  background:none;
  border:none;
  color: var(--sidebar-ink-dim);
  font-size: 16px;
  cursor:pointer;
  padding: 2px 6px;
}

.search-wrap{
  padding: 16px 20px 10px;
  position:relative;
}
.search-input{
  width:100%;
  background: #121417;
  border: 1px solid var(--sidebar-line);
  color: var(--sidebar-ink);
  font-family: var(--font-mono);
  font-size: 13.5px;
  padding: 10px 12px;
  border-radius: 3px;
  outline:none;
  transition: border-color .15s ease;
}
.search-input::placeholder{ color: #666b74; }
.search-input:focus{ border-color: var(--accent); }
.search-count{
  display:block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--sidebar-ink-dim);
  margin-top: 6px;
  min-height: 14px;
}

.filter-chips{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  padding: 4px 20px 14px;
  border-bottom: 1px solid var(--sidebar-line);
}
.chip{
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.01em;
  padding: 5px 9px 5px 8px;
  border-radius: 3px;
  border: 1px solid var(--sidebar-line);
  background: transparent;
  color: var(--sidebar-ink-dim);
  cursor:pointer;
  display:flex;
  align-items:center;
  gap:6px;
  transition: all .12s ease;
}
.chip .dot{
  width:6px; height:6px; border-radius:1px;
  display:inline-block;
  flex-shrink:0;
}
.chip:hover{ border-color: var(--sidebar-ink-dim); color: var(--sidebar-ink); }
.chip.active{
  background: var(--sidebar-ink);
  color: var(--sidebar-bg);
  border-color: var(--sidebar-ink);
}
.chip.active .dot{ background: currentColor !important; }

.index-list{
  flex:1;
  overflow-y:auto;
  padding: 6px 0 10px;
}
.index-item{
  display:flex;
  align-items:baseline;
  gap: 10px;
  padding: 7px 20px;
  cursor:pointer;
  border-left: 2px solid transparent;
  transition: background .12s ease;
}
.index-item:hover{ background: #22262D; }
.index-item.current{
  background: #22262D;
  border-left-color: #E8A15B;
}
.index-num{
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--sidebar-ink-dim);
  flex-shrink:0;
  width: 28px;
}
.index-title{
  font-size: 13px;
  line-height:1.4;
  color: var(--sidebar-ink);
}
.index-title mark{
  background: #E8A15B;
  color: #1B1E23;
  border-radius:1px;
  padding: 0 1px;
}

.sidebar-foot{
  padding: 12px 20px 18px;
  font-size: 11px;
  color: var(--sidebar-ink-dim);
  border-top: 1px solid var(--sidebar-line);
  font-family: var(--font-mono);
}

/* ============================================================
   Main
============================================================ */
.main{
  flex:1;
  min-width:0;
}

.topbar{
  position: sticky;
  top:0;
  z-index: 5;
  display:flex;
  align-items:center;
  gap: 14px;
  padding: 14px 32px;
  background: rgba(245,243,238,0.9);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.menu-btn{
  display:none;
  flex-direction:column;
  gap:4px;
  background:none;
  border:none;
  cursor:pointer;
  padding: 6px 4px;
}
.menu-btn span{
  width: 20px; height: 2px; background: var(--ink);
}
.topbar-title{
  font-family: var(--font-display);
  font-weight:500;
  font-size: 14.5px;
  flex:1;
}
.topbar-meta{
  font-size: 12px;
  color: var(--ink-dim);
}

.hero{
  padding: 64px 32px 40px;
  max-width: 880px;
}
.hero-tag{
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 18px;
  font-weight:500;
}
.hero-title{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(30px, 4.4vw, 46px);
  line-height: 1.12;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}
.hero-title .accent{
  color: var(--accent);
  font-style: italic;
}
.hero-desc{
  font-size: 15.5px;
  line-height: 1.65;
  color: var(--ink-dim);
  max-width: 620px;
  margin:0;
}

/* ============================================================
   Cards
============================================================ */
.cards{
  padding: 32px 32px 90px;
  display:grid;
  grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
  gap: 18px;
  max-width: 1500px;
}

.card{
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 22px 24px 24px;
  scroll-margin-top: 90px;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.card:target,
.card.highlight{
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-ink);
}

.card-head{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap: 12px;
  margin-bottom: 12px;
}
.card-num{
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  padding: 2px 6px;
  white-space:nowrap;
}
.card-cat{
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 3px 7px;
  border-radius: 3px;
  white-space:nowrap;
}

.card-title{
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  line-height: 1.3;
  margin: 0 0 4px;
}
.card-title mark{
  background: #FCE7B8;
  color: inherit;
  border-radius:1px;
  padding: 0 1px;
}

.card-rule{
  height:1px;
  background: linear-gradient(to right, var(--line-strong), transparent);
  margin: 12px 0 14px;
}

.card-body{ font-size: 13.8px; line-height: 1.55; }

.tree-line{
  position:relative;
  padding: 4px 0 4px 0;
  color: var(--ink);
}
.tree-line mark{
  background: #FCE7B8;
  border-radius:1px;
  padding: 0 1px;
}
.tree-d0{ padding-left: 0; font-weight: 600; margin-top: 8px; }
.tree-d0:first-child{ margin-top:0; }
.tree-d1{ padding-left: 18px; color: var(--ink); border-left: 1px solid var(--line); margin-left: 3px; }
.tree-d2{ padding-left: 18px; color: var(--ink-dim); border-left: 1px solid var(--line); margin-left: 21px; }
.tree-d3{ padding-left: 18px; color: var(--ink-dim); border-left: 1px dashed var(--line); margin-left: 39px; font-size: 0.95em; }
.tree-d4{ padding-left: 18px; color: var(--ink-faint); border-left: 1px dashed var(--line); margin-left: 57px; font-size: 0.92em; }

.tree-line a{ color: var(--accent); word-break: break-all; }

.card-cats{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  justify-content:flex-end;
}

.card-images{
  display:grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin: 4px 0 14px;
}
.card-images.many{
  grid-template-columns: repeat(2, 1fr);
}
.card-img-link{
  display:block;
  border-radius: 4px;
  overflow:hidden;
  border: 1px solid var(--line);
  line-height:0;
}
.card-img-link img{
  width:100%;
  display:block;
  cursor: zoom-in;
  transition: transform .2s ease;
}
.card-img-link:hover img{ transform: scale(1.02); }

.note-flag{
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-dim);
  background: #F0EEE7;
  border: 1px dashed var(--line-strong);
  border-radius: 4px;
  padding: 10px 12px;
  line-height: 1.5;
}

.index-img-flag{
  margin-left: auto;
  font-size: 11px;
  color: #E8A15B;
  flex-shrink:0;
}

/* ============================================================
   Lightbox
============================================================ */
.lightbox{
  display:none;
  position: fixed;
  inset:0;
  background: rgba(15,15,14,0.92);
  z-index: 60;
  align-items:center;
  justify-content:center;
  padding: 40px;
  cursor: zoom-out;
}
.lightbox.show{ display:flex; }
.lightbox img{
  max-width: 100%;
  max-height: 100%;
  border-radius: 4px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.empty-state{
  padding: 60px 32px;
  text-align:center;
  color: var(--ink-dim);
}
.empty-state .mono{ font-size: 28px; color: var(--line-strong); margin-bottom: 10px; }

/* ============================================================
   Responsive
============================================================ */
@media (max-width: 900px){
  .sidebar{
    position: fixed;
    left:0; top:0;
    z-index: 30;
    transform: translateX(-100%);
    transition: transform .22s ease;
    width: min(84vw, 360px);
  }
  .sidebar.open{ transform: translateX(0); }
  .sidebar-close{ display:block; }
  .menu-btn{ display:flex; }
  .cards{ grid-template-columns: 1fr; padding: 20px 18px 70px; }
  .topbar{ padding: 12px 18px; }
}

.sidebar-scrim{
  display:none;
  position:fixed; inset:0;
  background: rgba(0,0,0,0.4);
  z-index: 25;
}
.sidebar-scrim.show{ display:block; }

/* ============================================================
   Focus visibility
============================================================ */
a:focus-visible, button:focus-visible, input:focus-visible, .index-item:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

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

/* ============================================================
   Add-card button (topbar)
============================================================ */
.add-card-btn{
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--ink);
  color: var(--paper);
  border: none;
  border-radius: 4px;
  padding: 7px 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity .12s ease;
}
.add-card-btn:hover{ opacity: 0.85; }

/* ============================================================
   Status + voting row
============================================================ */
.status-row{
  display:flex;
  align-items:center;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.status-pill{
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.02em;
  padding: 4px 9px;
  border-radius: 20px;
  border: 1px solid transparent;
  white-space: nowrap;
}
.status-suggested{
  background: #EFEDE6;
  color: var(--ink-dim);
  border-color: var(--line-strong);
}
.status-planned{
  background: #E3EAFB;
  color: #2447C4;
  border-color: #B9C9F2;
}
.status-implemented{
  background: #E1F1EA;
  color: #1E8A6E;
  border-color: #B7DFCC;
}

.vote-btn{
  display:flex;
  align-items:center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--paper-2);
  color: var(--ink-dim);
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  padding: 4px 10px 4px 9px;
  cursor: pointer;
  transition: all .12s ease;
  margin-left: auto;
}
.vote-btn:hover{ border-color: var(--accent); color: var(--accent); }
.vote-btn.voted{
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.vote-btn .thumb-icon{ flex-shrink:0; }

.edit-btn{
  font-family: var(--font-mono);
  font-size: 12px;
  background: none;
  color: var(--ink-dim);
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  padding: 4px 10px;
  cursor: pointer;
  transition: all .12s ease;
}
.edit-btn:hover{ border-color: var(--ink); color: var(--ink); }

.custom-flag{
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 3px;
  padding: 1px 4px;
  margin-left: 4px;
  vertical-align: middle;
}

/* ============================================================
   Edit form
============================================================ */
.card.editing{
  border-color: var(--accent);
}
.edit-label{
  display:block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-dim);
  margin: 12px 0 4px;
}
.edit-label:first-of-type{ margin-top: 4px; }
.edit-input{
  width: 100%;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  padding: 8px 10px;
  outline: none;
  box-sizing: border-box;
}
.edit-input:focus{ border-color: var(--accent); }
.edit-title{ font-family: var(--font-display); font-weight: 600; font-size: 16px; }
.edit-body{ font-family: var(--font-mono); font-size: 12.5px; line-height: 1.6; resize: vertical; }
.edit-row{ display:flex; gap: 12px; }
.edit-col{ flex:1; min-width: 0; }
.edit-images-note{
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  margin-top: 10px;
}
.edit-actions{
  display:flex;
  gap: 8px;
  margin-top: 16px;
}
.save-btn, .cancel-btn, .delete-btn{
  font-family: var(--font-mono);
  font-size: 12px;
  border-radius: 4px;
  padding: 7px 14px;
  cursor: pointer;
  border: 1px solid var(--line-strong);
}
.save-btn{
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.save-btn:hover{ opacity: 0.9; }
.cancel-btn{
  background: none;
  color: var(--ink-dim);
}
.cancel-btn:hover{ border-color: var(--ink); color: var(--ink); }
.delete-btn{
  background: none;
  color: #A32B2B;
  border-color: #E3C6C6;
  font-size: 11px;
  padding: 4px 9px;
}
.delete-btn:hover{ background: #FBEBEB; }

@media (max-width: 900px){
  .topbar{ flex-wrap: wrap; }
  .add-card-btn{ order: 3; width: 100%; margin-top: 4px; }
}