/* RC GEN PRO v8.0 - LAYOUT ENGINE
   Phase 3: Structural Logic & Grid Systems
   Style: Engineering Precision (No unnecessary padding)
*/

/* =========================================
   1. GLOBAL RESET & BASE
   ========================================= */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    width: 100vw;
    overflow: hidden; /* App-like feel, no outer scroll */
    background-color: var(--bg-body);
    color: var(--text-primary);
    font-family: var(--font-ui);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased; /* Crisp text */
}

/* =========================================
   2. APP SHELL (Flexbox Container)
   ========================================= */
.app-layout {
    display: flex;
    width: 100vw;
    height: 100vh;
    position: relative;
}

/* =========================================
   3. FIXED SIDEBAR (Command Strip)
   ========================================= */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: var(--z-sidebar);
    flex-shrink: 0; /* Never shrink */
    height: 100vh;
}

/* Logo Box */
.logo-box {
    width: 100%;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 20px;
    border-bottom: 1px solid var(--border-color);
}

/* Nav Menu */
.nav-menu {
    flex: 1;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: var(--space-sm);
    gap: 4px; /* Tight spacing */
    overflow-y: auto;
    overflow-x: hidden;
}

/* Spacers */
.spacer-line {
    width: 40%;
    height: 1px;
    background: var(--border-color);
    margin: 8px 0;
}

.spacer-flex {
    flex: 1; /* Pushes settings to bottom */
}

/* Nav Item (Button) */
.nav-item {
    width: 48px;
    height: 48px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    cursor: pointer;
    border-radius: var(--radius); /* 0px */
    transition: all var(--duration) var(--ease);
    position: relative;
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--bg-active);
    color: var(--primary);
    box-shadow: inset 3px 0 0 0 var(--primary); /* Left Indicator Line */
}

/* =========================================
   4. SIDEBAR TOOLTIPS (Pure CSS)
   ========================================= */
.nav-item[data-tooltip]:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    margin-left: 12px;
    background: var(--bg-surface);
    color: var(--text-primary);
    padding: 6px 10px;
    font-size: 11px;
    font-family: var(--font-tech);
    font-weight: 700;
    border: 1px solid var(--border-color);
    white-space: nowrap;
    z-index: var(--z-tooltip);
    pointer-events: none;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5);
    opacity: 0;
    animation: tooltip-slide 0.15s forwards 0.1s; /* Slight delay */
}

/* Tooltip Arrow */
.nav-item[data-tooltip]:hover::before {
    content: '';
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    margin-left: 6px;
    border-width: 6px;
    border-style: solid;
    border-color: transparent var(--border-color) transparent transparent;
    opacity: 0;
    animation: tooltip-slide 0.15s forwards 0.1s;
    z-index: var(--z-tooltip);
}

@keyframes tooltip-slide {
    to { opacity: 1; transform: translate(0, -50%); }
}

/* =========================================
   5. MAIN CONTENT (Workspace)
   ========================================= */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: var(--bg-body);
    position: relative;
    overflow: hidden;
}

/* Top Bar (Header) */
.top-bar {
    height: var(--header-height);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 var(--space-lg);
    flex-shrink: 0;
    z-index: var(--z-header);
}

.system-status {
    display: flex;
    align-items: center;
    gap: 10px;
}
.tech-text {
    font-family: var(--font-tech);
    font-size: 12px;
    letter-spacing: 1px;
    color: var(--text-secondary);
}
.status-dot {
    width: 8px; height: 8px;
    background: var(--success);
    border-radius: 50%; /* Only round thing allowed */
    box-shadow: 0 0 8px var(--success);
}

.header-controls {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}
.user-avatar {
    width: 32px; height: 32px;
    background: var(--bg-active);
    color: var(--primary);
    display: flex; align-items: center; justify-content: center;
    font-family: var(--font-tech);
    font-weight: 700;
    font-size: 12px;
    border: 1px solid var(--border-color);
}

/* Content Stage (Scrollable Area) */
.content-stage {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: var(--space-lg);
    position: relative;
    scroll-behavior: smooth;
}

/* View Management */
.view {
    display: none;
    width: 100%;
    max-width: 1920px; /* Limit ultra-wide */
    margin: 0 auto;
    padding-bottom: 40px;
}
.view.active { display: block; }

/* =========================================
   6. DASHBOARD GRID (Bento Layout)
   ========================================= */
.grid-dashboard {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: 120px 450px; /* Fixed heights for tight look */
    gap: var(--space-md);
}

/* Card Foundation */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: var(--shadow-card);
    overflow: hidden;
}

.card-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.card h3 {
    font-family: var(--font-tech);
    font-size: 14px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 0;
}

/* KPI Cards */
.kpi-card {
    grid-column: span 1;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
}
.kpi-info label {
    font-family: var(--font-tech);
    font-size: 11px;
    color: var(--text-secondary);
    display: block;
}
.kpi-info h2 {
    font-family: var(--font-tech);
    font-size: 32px;
    color: var(--text-primary);
    margin: 4px 0 0 0;
    line-height: 1;
}
.kpi-icon {
    font-size: 24px;
    opacity: 0.8;
}
.kpi-icon.blue { color: var(--info); }
.kpi-icon.green { color: var(--success); }
.kpi-icon.red { color: var(--danger); }
.kpi-icon.purple { color: #A855F7; }

/* Chart & Actions */
.chart-box { 
    grid-column: span 3; 
    min-height: 450px;
}
.chart-wrapper {
    flex: 1;
    width: 100%;
    position: relative;
}

.actions-box { 
    grid-column: span 1; 
}
.btn-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    height: 100%;
}

/* =========================================
   7. DATA REGISTRY LAYOUT
   ========================================= */
.toolbar-panel {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--space-md);
    background: var(--bg-surface);
    padding: var(--space-sm);
    border: 1px solid var(--border-color);
    height: 56px;
    align-items: center;
}

.search-module {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-left: 12px;
    width: 350px;
    color: var(--text-tertiary);
    border-right: 1px solid var(--border-color);
    height: 100%;
}
.search-input {
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-tech);
    width: 100%;
    height: 100%;
    outline: none;
    font-size: 14px;
}

.action-module { display: flex; gap: var(--space-sm); align-items: center; padding-right: 8px; }
.divider-v { width: 1px; height: 24px; background: var(--border-color); margin: 0 4px; }

.grid-wrapper {
    border: 1px solid var(--border-color);
    background: var(--bg-surface);
    height: calc(100vh - 220px); /* Fill remaining space */
    overflow: auto;
    position: relative;
}

/* =========================================
   8. SETTINGS & PRINT LAYOUTS
   ========================================= */
.settings-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-md);
}

.danger-zone {
    border: 1px solid var(--danger);
    background: rgba(239, 68, 68, 0.03);
}

.print-studio-layout {
    display: flex;
    gap: var(--space-md);
    height: calc(100vh - 140px);
}
.print-controls {
    width: 300px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    overflow-y: auto;
}
.print-preview-area {
    flex: 1;
    background: #525659; /* Standard Grey for preview contrast */
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: center;
    padding: 40px;
    overflow: auto;
}

/* =========================================
   9. SCROLLBARS (NASA Style)
   ========================================= */
.custom-scroll::-webkit-scrollbar { width: 8px; height: 8px; }
.custom-scroll::-webkit-scrollbar-track { background: var(--bg-body); }
.custom-scroll::-webkit-scrollbar-thumb { 
    background: var(--border-color); 
    border: 1px solid var(--bg-body); 
}
.custom-scroll::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* =========================================
   10. RESPONSIVE BREAKPOINTS
   ========================================= */
@media (max-width: 1200px) {
    .grid-dashboard { grid-template-columns: repeat(2, 1fr); grid-template-rows: auto; }
    .kpi-card { grid-column: span 1; }
    .chart-box { grid-column: span 2; min-height: 400px; }
    .actions-box { grid-column: span 2; }
    .btn-grid { flex-direction: row; }
}

@media (max-width: 768px) {
    .app-layout { flex-direction: column; }
    .sidebar { 
        width: 100vw; height: 60px; 
        flex-direction: row; 
        border-right: none; 
        border-bottom: 1px solid var(--border-color);
    }
    .nav-menu { flex-direction: row; padding: 0 10px; gap: 0; }
    .nav-item { width: 14vw; height: 100%; border-radius: 0; box-shadow: none !important; }
    .nav-item.active { border-bottom: 2px solid var(--primary); background: transparent; }
    
    .spacer-line, .spacer-flex, .logo-box { display: none; }
    
    .grid-dashboard { grid-template-columns: 1fr; }
    .kpi-card, .chart-box, .actions-box { grid-column: span 1; }
    
    .print-studio-layout { flex-direction: column; }
    .print-controls { width: 100%; height: auto; }
    .desktop-only { display: none; }
}