/* ============================================
   ATLAS V3 — Category-driven navigation
   ============================================ */

/* Animated hero visual — canvas sits behind the headline */
.atlas-hero-wrap {
  position: relative;
  margin: 0 calc(-1 * var(--edge));
  padding: 0 var(--edge);
  overflow: hidden;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 32px;
  isolation: isolate;
}
.hero-visual {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: var(--ink);
  z-index: 0;
  pointer-events: auto;
}
.atlas-hero-wrap::after {
  /* Fade the bottom of the canvas into the paper color */
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, rgba(26,29,43,0) 55%, var(--paper) 100%),
    radial-gradient(1000px 400px at 50% 60%, rgba(26,29,43,0) 0%, rgba(26,29,43,0.35) 100%);
  pointer-events: none;
  z-index: 1;
}

/* Scene indicator — subtle, bottom-right of hero */
.hero-scene-indicator {
  position: absolute;
  right: var(--edge);
  bottom: 18px;
  z-index: 3;
  display: flex;
  gap: 14px;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  pointer-events: none;
}
.hero-scene-indicator span {
  color: rgba(244, 237, 220, 0.35);
  transition: color 0.6s ease;
  padding: 4px 10px;
  border: 1px solid rgba(244, 237, 220, 0.15);
  border-radius: 2px;
  background: rgba(26, 29, 43, 0.35);
  backdrop-filter: blur(4px);
}
.hero-scene-indicator span.active {
  color: rgba(244, 237, 220, 0.95);
  border-color: rgba(244, 237, 220, 0.6);
  background: rgba(26, 29, 43, 0.6);
}

.atlas-v3 {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--edge);
}

/* Hero masthead — now overlays the canvas */
.atlas-v3-hero {
  position: relative;
  z-index: 2;
  padding: 72px 0 56px;
  border-bottom: none;
  margin-bottom: 0;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 48px;
  align-items: end;
  min-height: clamp(360px, 58vh, 560px);
  color: var(--paper);
}
.atlas-v3-hero h1 {
  font-size: clamp(64px, 10vw, 140px);
  line-height: 0.88;
  letter-spacing: -0.04em;
  font-family: var(--serif);
  color: var(--paper);
  text-shadow: 0 2px 24px rgba(0,0,0,0.35);
}
.atlas-v3-hero h1 em { color: var(--amber); font-style: italic; }
.atlas-v3-hero .dateline {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(244,239,230,0.55);
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(244,239,230,0.2);
}
.atlas-v3-hero-right {
  font-size: 14px;
  line-height: 1.55;
  color: rgba(244,239,230,0.75);
  border-left: 1px solid rgba(244,239,230,0.2);
  padding-left: 24px;
  text-shadow: 0 1px 6px rgba(0,0,0,0.35);
}
.atlas-v3-hero-right .counter {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(244,239,230,0.55);
  margin-top: 18px;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
.atlas-v3-hero-right .counter strong {
  font-family: var(--serif);
  font-size: 22px;
  color: var(--paper);
  font-weight: 400;
  margin-right: 4px;
}

/* Toolbar */
.atlas-toolbar {
  position: sticky;
  top: 48px;
  z-index: 10;
  background: var(--paper);
  padding: 14px 0;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 20px;
  align-items: center;
}
.atlas-search {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 999px;
  max-width: 520px;
}
.atlas-search input {
  flex: 1;
  font-family: var(--serif);
  font-size: 17px;
  background: transparent;
  border: none;
  outline: none;
  color: var(--ink);
}
.atlas-search input::placeholder { color: var(--ink-3); }
.atlas-search-icon { color: var(--ink-3); font-family: var(--mono); font-size: 14px; }
.atlas-search-hit {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.1em;
}
.atlas-viewtoggle {
  display: flex;
  gap: 2px;
  background: var(--paper-2);
  border-radius: 999px;
  padding: 3px;
  border: 1px solid var(--rule);
}
.atlas-viewtoggle button {
  padding: 7px 14px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border-radius: 999px;
  color: var(--ink-3);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: all 0.15s;
}
.atlas-viewtoggle button:hover { color: var(--ink); }
.atlas-viewtoggle button.active { background: var(--ink); color: var(--paper); }

/* Category tabs strip */
.atlas-cats {
  display: flex;
  gap: 0;
  margin-bottom: 48px;
  border-bottom: 1px solid var(--rule);
  overflow-x: auto;
  scrollbar-width: none;
}
.atlas-cats::-webkit-scrollbar { display: none; }
.atlas-cat-tab {
  padding: 14px 18px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-3);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.15s;
  flex-shrink: 0;
}
.atlas-cat-tab:hover { color: var(--ink); }
.atlas-cat-tab.active {
  color: var(--ink);
  border-bottom-color: var(--amber);
}
.atlas-cat-tab-count {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--ink-3);
  padding: 2px 6px;
  background: var(--paper-2);
  border-radius: 999px;
  letter-spacing: 0.1em;
}
.atlas-cat-tab.active .atlas-cat-tab-count { background: var(--amber); color: var(--paper); }

/* Category section */
.atlas-category {
  margin-bottom: 80px;
  scroll-margin-top: 120px;
}
.atlas-cat-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 24px;
  padding-bottom: 16px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--ink);
}
.atlas-cat-head .num {
  font-family: var(--serif);
  font-size: 72px;
  line-height: 1;
  color: var(--amber);
  letter-spacing: -0.03em;
  font-style: italic;
}
.atlas-cat-head h2 {
  font-family: var(--serif);
  font-size: clamp(36px, 4vw, 56px);
  line-height: 1;
  letter-spacing: -0.02em;
}
.atlas-cat-head .tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-3);
  text-align: right;
}
.atlas-cat-head .tag strong { color: var(--ink); font-weight: 500; }

/* ============ GRID VIEW ============ */
.atlas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1px;
  background: var(--rule-soft);
  border: 1px solid var(--rule-soft);
}
.atlas-grid-card {
  background: var(--paper);
  padding: 22px 20px 20px;
  cursor: pointer;
  transition: all 0.2s;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 180px;
}
.atlas-grid-card:hover {
  background: var(--paper-3);
  z-index: 1;
  box-shadow: 0 0 0 1px var(--ink);
}
.atlas-grid-card .accent {
  position: absolute;
  top: 0; left: 0;
  width: 24px; height: 2px;
  background: var(--accent, var(--amber));
}
.atlas-grid-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.atlas-grid-card-num { color: var(--accent, var(--ink-3)); }
.atlas-grid-card-name {
  font-family: var(--serif);
  font-size: 26px;
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin-top: auto;
}
.atlas-grid-card-tag {
  font-size: 12px;
  color: var(--ink-3);
  font-style: italic;
  line-height: 1.4;
}
.atlas-grid-card-topics {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.15em;
  color: var(--ink-3);
  text-transform: uppercase;
  padding-top: 10px;
  border-top: 1px solid var(--rule-soft);
  display: flex;
  justify-content: space-between;
}

/* ============ INDEX (dense) VIEW ============ */
.atlas-index {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
  gap: 0;
  border-top: 1px solid var(--rule);
}
.atlas-index-row {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  gap: 12px;
  padding: 12px 16px 12px 0;
  border-bottom: 1px solid var(--rule-soft);
  cursor: pointer;
  align-items: baseline;
  transition: all 0.12s;
}
.atlas-index-row:hover {
  padding-left: 12px;
  background: var(--paper-2);
}
.atlas-index-row .num {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-3);
  letter-spacing: 0.15em;
}
.atlas-index-row .main {
  display: flex;
  gap: 14px;
  align-items: baseline;
  flex-wrap: wrap;
}
.atlas-index-row .name {
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: -0.01em;
}
.atlas-index-row .tag {
  font-size: 13px;
  color: var(--ink-3);
  font-style: italic;
}
.atlas-index-row .count {
  font-family: var(--mono);
  font-size: 9px;
  color: var(--ink-3);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  white-space: nowrap;
}

/* ============ SHELF VIEW (reading-room) ============ */
.atlas-shelf {
  display: flex;
  gap: 2px;
  padding: 24px 0 16px;
  overflow-x: auto;
  border-bottom: 1px solid var(--rule);
  scrollbar-width: thin;
}
.atlas-shelf-book {
  min-width: 64px;
  height: 240px;
  background: var(--accent);
  color: var(--paper);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 14px 8px 12px;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  border-top: 2px solid rgba(255,255,255,0.15);
  border-bottom: 2px solid rgba(0,0,0,0.2);
  transition: all 0.15s;
  overflow: hidden;
}
.atlas-shelf-book:hover {
  min-width: 72px;
  filter: brightness(1.15);
}
.atlas-shelf-book::before {
  content: '';
  position: absolute;
  left: 4px; top: 0; bottom: 0;
  width: 1px;
  background: rgba(255,255,255,0.2);
}
.atlas-shelf-book .sb-num {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  opacity: 0.7;
  writing-mode: vertical-rl;
  text-orientation: mixed;
}
.atlas-shelf-book .sb-name {
  font-family: var(--serif);
  font-size: 15px;
  line-height: 1.1;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  margin: 12px auto;
  letter-spacing: 0.02em;
  font-weight: 500;
}
.atlas-shelf-book .sb-foot {
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.15em;
  opacity: 0.6;
  text-align: center;
  text-transform: uppercase;
}

/* Featured/Tools strip below */
.atlas-quick {
  margin: 64px 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.atlas-quick-item {
  background: var(--paper);
  padding: 22px 20px;
  cursor: pointer;
  transition: all 0.15s;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.atlas-quick-item:hover { background: var(--paper-2); }
.atlas-quick-item .sym {
  font-family: var(--serif);
  font-size: 32px;
  color: var(--amber);
  line-height: 1;
  font-style: italic;
}
.atlas-quick-item .lbl {
  font-family: var(--serif);
  font-size: 20px;
}
.atlas-quick-item .desc {
  font-size: 12px;
  color: var(--ink-3);
  line-height: 1.5;
}

/* No results */
.atlas-empty {
  padding: 80px 20px;
  text-align: center;
  color: var(--ink-3);
  font-family: var(--serif);
  font-size: 24px;
  font-style: italic;
}
.atlas-empty em { color: var(--amber); }

/* Search results (flat list) */
.atlas-results-head {
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: flex;
  justify-content: space-between;
}
.atlas-result-row {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 20px;
  padding: 14px 16px 14px 0;
  border-bottom: 1px solid var(--rule-soft);
  cursor: pointer;
  align-items: baseline;
  transition: all 0.12s;
}
.atlas-result-row:hover { padding-left: 16px; background: var(--paper-2); }
.atlas-result-row .kind {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber);
  width: 80px;
}
.atlas-result-row .title {
  font-family: var(--serif);
  font-size: 19px;
}
.atlas-result-row .sub {
  font-size: 13px;
  color: var(--ink-3);
  font-style: italic;
}
.atlas-result-row .where {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-3);
}

@media (max-width: 760px) {
  .atlas-v3-hero { grid-template-columns: 1fr; }
  .atlas-v3-hero-right { border-left: none; padding-left: 0; border-top: 1px solid var(--rule); padding-top: 20px; }
  .atlas-toolbar { grid-template-columns: 1fr; }
  .atlas-cat-head { grid-template-columns: 1fr; }
  .atlas-cat-head .num { font-size: 56px; }
  .atlas-cat-head .tag { text-align: left; }
}