/* ═══════════════════════════════════════════════════════════
   layout.css — Structural layout: topbar, sidebar, main
═══════════════════════════════════════════════════════════ */

/* ─── TOPBAR ─────────────────────────────────────────────── */
.topbar {
  height: var(--topbar-h);
  background: var(--ink);
  display: flex;
  align-items: center;
  padding: 0 2rem;
  gap: 1.5rem;
  position: sticky;
  top: 0;
  z-index: 200;
  border-bottom: 2px solid var(--gold);
}

.logo {
  font-family: 'Playfair Display', serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.01em;
  flex-shrink: 0;
}
.logo em { color: var(--gold-light); font-style: normal; }

/* ─── PORTAL SWITCHER ────────────────────────────────────── */
.portal-switcher {
  display: flex;
  background: rgba(255,255,255,0.08);
  border-radius: 6px;
  padding: 3px;
  gap: 2px;
  margin-left: auto;
}
.ps-btn {
  padding: 5px 20px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: transparent;
  color: rgba(255,255,255,0.45);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  font-family: 'DM Sans', sans-serif;
}
.ps-btn.active { background: var(--gold); color: var(--ink); }
.ps-btn:not(.active):hover { color: rgba(255,255,255,0.75); }

/* ─── TOPBAR USER ────────────────────────────────────────── */
.topbar-user {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255,255,255,0.65);
  font-size: 13px;
  font-weight: 500;
  flex-shrink: 0;
}
.topbar-avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--gold);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: var(--ink);
  flex-shrink: 0;
}
.topbar-notif {
  position: relative;
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  border-radius: 50%;
  transition: background var(--ease);
}
.topbar-notif:hover { background: rgba(255,255,255,0.1); }
.topbar-notif svg { width: 18px; height: 18px; fill: rgba(255,255,255,0.5); }
.notif-dot {
  position: absolute; top: 4px; right: 4px;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--gold); border: 2px solid var(--ink);
}

/* ─── APP LAYOUT ─────────────────────────────────────────── */
.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: calc(100vh - var(--topbar-h));
}

/* ─── SIDEBAR ────────────────────────────────────────────── */
.sidebar {
  background: var(--white);
  border-right: 1px solid var(--rule);
  padding: 1.25rem 0;
  position: sticky;
  top: var(--topbar-h);
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
}

.nav-section     { margin-bottom: 1.5rem; }
.nav-section-label {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0 1.25rem;
  margin-bottom: 4px;
}
.sidebar-divider {
  height: 1px;
  background: var(--rule);
  margin: 0.25rem 1.25rem 1rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 1.25rem;
  color: var(--slate);
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: all var(--ease);
}
.nav-item:hover { background: var(--surface); color: var(--ink); }
.nav-item.active {
  background: var(--gold-pale);
  color: var(--ink);
  border-left-color: var(--gold);
  font-weight: 600;
}
.nav-icon  { font-size: 15px; width: 18px; text-align: center; flex-shrink: 0; }
.nav-badge {
  margin-left: auto;
  background: var(--gold);
  color: var(--ink);
  font-size: 10px; font-weight: 700;
  padding: 1px 6px; border-radius: 10px;
}

/* ─── MAIN CONTENT ───────────────────────────────────────── */
.main {
  padding: 2rem 2.5rem;
  overflow-y: auto;
  min-width: 0;
}

/* ─── PAGE ───────────────────────────────────────────────── */
.page        { display: none; }
.page.active { display: block; }

.page-header           { margin-bottom: 2rem; }
.page-header h1        { margin-bottom: 4px; }
.page-header p         { color: var(--slate); font-size: 13.5px; }

/* ─── GRID HELPERS ───────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 2rem;
}
.stats-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.stats-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }

.two-col    { display: grid; grid-template-columns: 1fr 1fr;        gap: 20px; align-items: start; }
.col-35-65  { display: grid; grid-template-columns: 1fr 1.6fr;      gap: 20px; align-items: start; }
.col-65-35  { display: grid; grid-template-columns: 1.6fr 1fr;      gap: 20px; align-items: start; }

/* ─── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 1100px) {
  .stats-grid       { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .app-layout       { grid-template-columns: 1fr; }
  .sidebar          { display: none; }
  .two-col,
  .col-35-65,
  .col-65-35        { grid-template-columns: 1fr; }
  .main             { padding: 1.25rem; }
}
@media (max-width: 600px) {
  .topbar           { padding: 0 1rem; }
  .portal-switcher  { display: none; }
  .stats-grid       { grid-template-columns: 1fr 1fr; }
  .book-grid        { grid-template-columns: repeat(2, 1fr); }
  .wb-stats         { display: none; }
}