/* ========================================
   CSS VARIABLES & BASE STYLES
   ======================================== */

:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --sidebar-bg: #1e293b;
    --sidebar-text: #94a3b8;
    --sidebar-active: #3b82f6;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}


/* ========================================
   LAYOUT
   ======================================== */

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


/* ========================================
   SIDEBAR
   ======================================== */

.sidebar {
    width: 280px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: var(--spacing-xl);
    overflow-y: auto;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
}

.logo {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo h1 {
    color: #ffffff;
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.logo p {
    font-size: 0.875rem;
    color: var(--sidebar-text);
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Navigation Groups */
.nav-group {
    margin-bottom: var(--spacing-sm);
}

.nav-group-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border: none;
    border-radius: var(--radius-md);
    color: #ffffff;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.95rem;
    font-weight: 600;
}

.nav-group-header:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-group-header.active {
    background: rgba(59, 130, 246, 0.2);
}

.group-icon {
    font-size: 1.25rem;
}

.group-title {
    flex: 1;
    text-align: left;
    margin: 0 var(--spacing-md);
}

.group-arrow {
    font-size: 0.75rem;
    transition: transform 0.2s;
}

.nav-group-header.collapsed .group-arrow {
    transform: rotate(-90deg);
}

/* Navigation Group Items */
.nav-group-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
    margin-left: var(--spacing-lg);
    max-height: 1000px;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    opacity: 1;
}

.nav-group-items.collapsed {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
}

/* Navigation Subgroups */
.nav-subgroup {
    margin-top: var(--spacing-xs);
}

.nav-subgroup-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.03);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--sidebar-text);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.85rem;
    font-weight: 500;
}

.nav-subgroup-header:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
}

.subgroup-icon {
    font-size: 1rem;
}

.subgroup-title {
    flex: 1;
    text-align: left;
    margin: 0 var(--spacing-sm);
}

.subgroup-arrow {
    font-size: 0.65rem;
    transition: transform 0.2s;
}

.nav-subgroup-header.collapsed .subgroup-arrow {
    transform: rotate(-90deg);
}

.nav-subgroup-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
    margin-left: var(--spacing-md);
    max-height: 500px;
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    opacity: 1;
}

.nav-subgroup-items.collapsed {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
}

/* Subgroup nav items - slightly smaller */
.nav-subgroup-items .nav-item {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
}

/* Old nav-section styles - remove */
.nav-section {
    display: none;
}

.nav-section h3 {
    display: none;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    width: 100%;
    padding: var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--sidebar-text);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.95rem;
    text-align: left;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: #ffffff;
}

.nav-item.active {
    background: var(--sidebar-active);
    color: #ffffff;
}

.nav-item .icon {
    font-size: 1.25rem;
}


/* ========================================
   MAIN CONTENT
   ======================================== */

.main-content {
    margin-left: 280px;
    flex: 1;
    padding: var(--spacing-xl);
}

.content-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.content-header h2 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.api-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-secondary);
    animation: pulse 2s infinite;
}

.status-dot.connected {
    background: var(--success-color);
}

.status-dot.error {
    background: var(--danger-color);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* API Endpoint Indicator */
.api-endpoint-indicator {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    border-radius: var(--radius-md);
    font-size: 12px;
    font-family: 'Courier New', monospace;
    font-weight: 500;
    white-space: nowrap;
}

.api-endpoint-indicator.production {
    background: #d4edda;
    border: 1px solid #28a745;
    color: #155724;
}

.api-endpoint-indicator.local {
    background: #fff3cd;
    border: 1px solid #ffc107;
    color: #856404;
}

.api-endpoint-indicator .endpoint-icon {
    margin-right: 6px;
    font-size: 14px;
}

.content-body {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}


/* ========================================
   WELCOME SCREEN
   ======================================== */

.welcome-screen {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.welcome-screen h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.welcome-screen p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.quick-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.stat-card {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.stat-card h4 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}


/* ========================================
   UTILITY CLASSES
   ======================================== */

.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.hidden { display: none; }