/* ==========================================================================
   LAYOUT.CSS — Application Shell, Sidebar, Topbar & 8pt Grid Layouts
   ========================================================================== */

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-app);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}

.app-container {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

/* SIDEBAR NAVIGATION */
.sidebar {
  width: 260px;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width var(--transition-base);
  z-index: 50;
}

.sidebar-header {
  padding: var(--space-5) var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border-bottom: 1px solid var(--border-subtle);
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 16px;
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-weight: 700;
  font-size: 15px;
  color: var(--text-main);
  line-height: 1.2;
}

.brand-subtitle {
  font-size: 11px;
  color: var(--text-muted);
}

.sidebar-nav {
  padding: var(--space-4) var(--space-3);
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.nav-category {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  padding: var(--space-2) var(--space-3) var(--space-1);
  margin-top: var(--space-2);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 500;
  transition: all var(--transition-fast);
  user-select: none;
  text-decoration: none;
}

.nav-item:hover {
  background-color: rgba(255, 255, 255, 0.04);
  color: var(--text-main);
}

.nav-item.active {
  background-color: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  font-weight: 600;
  border-left: 3px solid var(--accent-primary);
}

.nav-badge {
  margin-left: auto;
  padding: 2px 6px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  font-weight: 600;
  background-color: rgba(255, 255, 255, 0.08);
  color: var(--text-muted);
}

.sidebar-footer {
  padding: var(--space-4);
  border-top: 1px solid var(--border-subtle);
}

.progress-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  font-size: 11.5px;
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.progress-bar-wrap {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--grad-cyan);
  border-radius: var(--radius-pill);
  transition: width var(--transition-base);
}

/* MAIN WRAPPER */
.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow-y: auto;
}

/* TOPBAR */
.topbar {
  height: 64px;
  background: var(--bg-app);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.page-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.search-omnibox {
  display: flex;
  align-items: center;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-3);
  width: 280px;
  gap: var(--space-2);
}

.search-omnibox input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-main);
  font-size: 13px;
  width: 100%;
}

.search-kbd {
  font-family: var(--font-mono);
  font-size: 10px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-xs);
  padding: 2px 4px;
  color: var(--text-dim);
}

/* WORKSPACE CONTENT */
.content-area {
  padding: var(--space-6);
  flex: 1;
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
}

/* 8PT GRID SYSTEM */
.grid-cols-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}

.col-span-12 { grid-column: span 12 / span 12; }
.col-span-8 { grid-column: span 8 / span 12; }
.col-span-7 { grid-column: span 7 / span 12; }
.col-span-6 { grid-column: span 6 / span 12; }
.col-span-5 { grid-column: span 5 / span 12; }
.col-span-4 { grid-column: span 4 / span 12; }
.col-span-3 { grid-column: span 3 / span 12; }

@media (max-width: 1024px) {
  .sidebar { width: 72px; }
  .brand-info, .sidebar-footer, .nav-item span:not(.nav-icon) { display: none; }
  .col-span-8, .col-span-7, .col-span-6, .col-span-5, .col-span-4, .col-span-3 { grid-column: span 12 / span 12; }
}