/* ═══════════════════════════════════════════════════════════════════════════
   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;
  letter-spacing: 0.2px;
}

.brand-text h1 .brand-zh {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--gold);
  margin-left: 4px;
  letter-spacing: 0;
}

.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 {
  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;
}

/* Quick-view item with a trailing calendar trigger button */
.date-item.has-cal { padding-right: 6px; }
.date-item.has-cal .date-label {
  flex: 1;
  min-width: 0;
}
.cal-trigger {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(199, 160, 42, 0.10);
  color: var(--gold);
  border: 1px solid rgba(199, 160, 42, 0.35);
  border-radius: 7px;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  transition: color 0.15s, background 0.15s, border-color 0.15s, transform 0.12s;
}
.cal-trigger:hover {
  color: #1a1a1a;
  border-color: var(--gold);
  background: var(--gold);
  transform: scale(1.05);
}
.cal-trigger svg { display: block; }

.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);
}

/* ─── Calendar (按日期浏览) ──────────────────────────────────────────────── */
.cal-nav {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  text-transform: none;
  letter-spacing: 0;
}
.cal-nav-btn {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  padding: 0;
  transition: all 0.15s;
}
.cal-nav-btn:hover:not(:disabled) {
  background: var(--sidebar-hover);
  color: var(--gold);
  border-color: var(--gold);
}
.cal-nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}
.cal-month-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text);
  min-width: 56px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.calendar {
  padding: 8px 14px 14px;
}

/* ─── Calendar Popover (triggered by .cal-trigger) ───────────────────── */
.cal-popover-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(8, 12, 24, 0.45);
  backdrop-filter: blur(2px);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease;
  display: none;
}
.cal-popover-backdrop.active {
  display: block;
  opacity: 1;
  pointer-events: auto;
}
/* Defensive: never let the popover/backdrop leak in if [hidden] is honored
   but our `.active` rule is missing for some reason. */
.cal-popover[hidden],
.cal-popover-backdrop[hidden] { display: none !important; }
.cal-popover {
  position: fixed;
  z-index: 999;
  width: 320px;
  max-width: calc(100vw - 24px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.35),
              0 4px 12px rgba(0, 0, 0, 0.18);
  display: none;
  flex-direction: column;
  overflow: hidden;
  animation: cal-pop-in 0.16s ease-out;
}
.cal-popover.active { display: flex; }
@keyframes cal-pop-in {
  from { opacity: 0; transform: translateY(-4px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0)    scale(1); }
}
.cal-popover-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--sidebar-bg);
}
.cal-popover-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--gold);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  flex: 1;
}
.cal-popover-close {
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--text-muted);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  line-height: 1;
  padding: 0;
  transition: background 0.15s, color 0.15s;
}
.cal-popover-close:hover {
  background: var(--sidebar-hover);
  color: var(--text);
}
.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
}
.cal-dow {
  font-size: 0.62rem;
  color: var(--text-muted);
  text-align: center;
  padding: 4px 0 2px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.cal-day {
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text);
  border-radius: 6px;
  cursor: pointer;
  user-select: none;
  position: relative;
  font-variant-numeric: tabular-nums;
  border: 1px solid transparent;
  transition: background 0.12s, border-color 0.12s, color 0.12s;
}
.cal-day.empty {
  visibility: hidden;
}
.cal-day.outside {
  color: var(--text-muted);
  opacity: 0.35;
}
.cal-day.no-data {
  color: var(--text-muted);
  opacity: 0.28;
  cursor: not-allowed;
  pointer-events: none;
}
.cal-day.has-data:hover {
  border-color: var(--gold);
}
/* Heat-intensity tiers based on (arxiv_relevant + github_relevant + x_intel_total). */
.cal-day.heat-1 { background: rgba(214, 165, 46, 0.10); }
.cal-day.heat-2 { background: rgba(214, 165, 46, 0.22); }
.cal-day.heat-3 { background: rgba(214, 165, 46, 0.38); }
.cal-day.heat-4 { background: rgba(214, 165, 46, 0.55); color: #1a1a1a; }
.cal-day.active {
  background: var(--sidebar-active);
  border-color: var(--gold);
  color: var(--gold);
  box-shadow: 0 0 0 1px var(--gold) inset;
}
.cal-day.today::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent-purple);
}

/* Sidebar controls — pinned to the bottom of the sidebar */
.sidebar-controls {
  margin-top: auto;
  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);
  letter-spacing: 0.3px;
}

.mobile-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.mobile-header-actions .sidebar-ctrl-btn {
  width: 34px;
  height: 34px;
}
.cal-trigger-mobile {
  color: var(--gold) !important;
  border-color: rgba(199, 160, 42, 0.35) !important;
  background: rgba(199, 160, 42, 0.10) !important;
}
.cal-trigger-mobile:hover {
  background: var(--gold) !important;
  color: #1a1a1a !important;
}
.cal-trigger-mobile svg { display: block; }

/* 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;
  }
}