/* ═══════════════════════════════════════════════════════════════════════════
   layout.css — Sidebar, Main Content Area, Grid System, Responsive
   ═══════════════════════════════════════════════════════════════════════════ */

/* ─── Sidebar ───────────────────────────────────────────────────────────── */
.sidebar {
  width: 260px;
  min-width: 260px;
  height: 100vh;
  position: sticky;
  top: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  transition: width 0.3s cubic-bezier(0.4,0,0.2,1),
              min-width 0.3s cubic-bezier(0.4,0,0.2,1);
  z-index: 100;
}

.sidebar-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.brand-text h1 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}

.brand-text span {
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* Date list */
.sidebar-section-title {
  padding: 16px 20px 8px;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--gold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.date-list {
  flex: 1;
  overflow-y: auto;
  padding: 0 8px;
}

.date-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  margin: 2px 0;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.date-item:hover {
  background: var(--sidebar-hover);
}

.date-item.active {
  background: var(--sidebar-active);
  border-left-color: var(--gold);
}

.date-item .date-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text);
}

.date-item.active .date-label {
  color: var(--gold);
}

.date-item .date-badges {
  display: flex;
  gap: 6px;
}

.date-badge {
  font-size: 0.68rem;
  padding: 1px 6px;
  border-radius: 10px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.date-badge.papers {
  background: rgba(167, 139, 250, 0.15);
  color: var(--accent-purple);
}

.date-badge.repos {
  background: rgba(56,161,105,0.15);
  color: var(--accent-green);
}

/* Sidebar controls */
.sidebar-controls {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-ctrl-btn {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  transition: all 0.2s;
}

.sidebar-ctrl-btn:hover {
  background: var(--sidebar-hover);
  color: var(--text);
}

.theme-toggle {
  font-size: 1rem;
}

/* ─── Mobile Header ─────────────────────────────────────────────────────── */
.mobile-header {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 52px;
  background: var(--sidebar-bg);
  border-bottom: 1px solid var(--border);
  padding: 0 16px;
  align-items: center;
  justify-content: space-between;
  z-index: 200;
}

.mobile-header .hamburger {
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 1.3rem;
  cursor: pointer;
}

.mobile-header .mobile-brand {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--gold);
}

/* Overlay */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 99;
}

/* ─── Main Content ──────────────────────────────────────────────────────── */
.main-content {
  flex: 1;
  overflow-y: auto;
  height: 100vh;
}

.module {
  padding: 32px;
  animation: fadeIn 0.4s ease;
}

/* ─── Grid System ───────────────────────────────────────────────────────── */
.grid-2     { display: grid; grid-template-columns: 1fr 1fr;       gap: 20px; }
.grid-3     { display: grid; grid-template-columns: repeat(3, 1fr);gap: 16px; }
.grid-60-40 { display: grid; grid-template-columns: 3fr 2fr;       gap: 24px; }
.grid-45-55 { display: grid; grid-template-columns: 45fr 55fr;     gap: 24px; }
.grid-65-35 { display: grid; grid-template-columns: 65fr 35fr;     gap: 24px; }

.kpi-row   { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; margin-bottom: 24px; }
.kpi-row-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 24px; }

/* ─── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 1200px) {
  .kpi-row   { grid-template-columns: repeat(3, 1fr); }
  .kpi-row-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .grid-60-40, .grid-45-55, .grid-65-35 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .mobile-header { display: flex; }
  .sidebar-overlay.active { display: block; }

  .sidebar {
    position: fixed;
    left: -280px;
    top: 52px;
    height: calc(100vh - 52px);
    transition: left 0.3s ease;
    z-index: 100;
  }
  .sidebar.mobile-open { left: 0; }

  body { padding-top: 52px; flex-direction: column; }

  .module { padding: 16px 12px; }

  .kpi-row, .kpi-row-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }

  /* Disable hover transforms on mobile */
  .card:hover,
  .kpi-card:hover {
    transform: none !important;
    box-shadow: none !important;
  }
}