/* ============================================================
   layout.css — Page structure, grid, and major containers
   ============================================================ */

/* ── App Shell ── */
.app-shell {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ── Top Navigation Bar ── */
.topnav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 24px;
  height: 56px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border-subtle);
  background: rgba(8, 11, 20, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.topnav__logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  margin-right: 8px;
  flex-shrink: 0;
}

.topnav__logo span {
  color: var(--accent-blue);
}

.topnav__nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
}

.topnav__spacer {
  flex: 1;
}

.topnav__avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
  font-family: var(--font-display);
  color: #fff;
  flex-shrink: 0;
  cursor: pointer;
  letter-spacing: 0.02em;
}

/* ── Main Content Area ── */
.main-content {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 0;
  flex: 1;
  overflow: hidden;
  min-height: 0;
}

/* ── Left Column ── */
.left-col {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--border-subtle);
  min-height: 0;
}

.left-col__top {
  padding: 20px 24px 0;
  flex-shrink: 0;
}

.left-col__feed {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px 24px 24px;
  min-height: 0;
}

/* Custom scrollbar for feed */
.left-col__feed::-webkit-scrollbar {
  width: 4px;
}

.left-col__feed::-webkit-scrollbar-track {
  background: transparent;
}

.left-col__feed::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: 2px;
}

.left-col__feed::-webkit-scrollbar-thumb:hover {
  background: var(--border-accent);
}

/* ── Right Sidebar ── */
.right-sidebar {
  display: flex;
  flex-direction: column;
  gap: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 20px 16px 24px;
  min-height: 0;
}

.right-sidebar::-webkit-scrollbar {
  width: 3px;
}

.right-sidebar::-webkit-scrollbar-track {
  background: transparent;
}

.right-sidebar::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 2px;
}

/* ── Section spacing helpers ── */
.section {
  margin-bottom: 20px;
}

.section-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-hint);
  margin-bottom: 10px;
}

/* ── Panel Overlay ── */
.panel-overlay {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(8, 11, 20, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.panel-card {
  background: #0E1220;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: 28px;
  width: 100%;
  max-width: 440px;
  position: relative;
}