/*
 * layout.css — Page shell, header, graph area, main split, sidebar
 * Depends on: tokens.css
 */

/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg-app);
  color: var(--text-1);
  transition: background 0.25s, color 0.25s;
  overflow: hidden;
}

/* ── App shell: full-height flex column ── */
#appShell {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ── Header ── */
#appHeader {
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 14px 20px 10px;
  z-index: 100;
  flex-shrink: 0;
  backdrop-filter: blur(12px);
}

.header-top {
  display: flex;
  align-items: center;
  gap: 14px;
}

#appTitle {
  font-size: 1.3rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
  flex-shrink: 0;
}

.search-row {
  display: flex;
  gap: 8px;
  flex: 1;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.tool-group {
  display: flex;
  gap: 6px;
  align-items: center;
  margin-left: auto;
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-2);
}

#maxPapersSlider {
  width: 80px;
  accent-color: var(--accent);
}

/* ── Progress bar ── */
#progressBar {
  height: 3px;
  background: var(--border);
  position: relative;
  overflow: hidden;
  margin-top: 6px;
  border-radius: 2px;
  display: none;
}
#progressBar.active { display: block; }
#progressFill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-dark));
  transition: width 0.3s ease;
  border-radius: 2px;
}

/* ── Main area: graph | sidebar ── */
#mainArea {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── Graph wrapper ── */
#graphWrapper {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--bg-graph);
}

#graphSvg {
  width: 100%;
  height: 100%;
  display: block;
}

/* ── Sidebar ── */
#sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--border);
  background: var(--bg-app);
  overflow-y: auto;
  overflow-x: hidden;
}
#sidebar::-webkit-scrollbar         { width: 5px; }
#sidebar::-webkit-scrollbar-track   { background: transparent; }
#sidebar::-webkit-scrollbar-thumb   { background: var(--border); border-radius: 4px; }

/* ── Panels inside sidebar ── */
.panel {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 16px 18px;
}

.panel-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
  margin-bottom: 12px;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  :root { --sidebar-w: 100%; }
  #mainArea    { flex-direction: column; }
  #graphWrapper { height: 55vh; }
  #sidebar     { max-height: 45vh; border-left: none; border-top: 1px solid var(--border); }
}