/* =============================================
   ANDROID ANALYTICS DASHBOARD - MAIN CSS
   analytics.anantx.in
   ============================================= */

/* CSS Variables for Theming */
:root {
    /* Light Theme Colors */
    --primary: #4361ee;
    --primary-hover: #3651d4;
    --primary-light: #e8ebff;
    
    --background: #f8fafc;
    --surface: #ffffff;
    --surface-hover: #f1f5f9;
    
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    
    --success: #10b981;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #ef4444;
    --danger-light: #fee2e2;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Typography */
    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-base: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.25rem;
    --font-2xl: 1.5rem;
    --font-3xl: 1.875rem;
    
    /* Layout */
    --sidebar-width: 240px;
    --sidebar-collapsed: 60px;
    --header-height: 64px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Theme Colors */
[data-theme="dark"] {
    --primary: #6366f1;
    --primary-hover: #5b5cf6;
    --primary-light: #312e81;
    
    --background: #0f172a;
    --surface: #1e293b;
    --surface-hover: #334155;
    
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --border: #334155;
    --border-light: #475569;
    
    --success: #34d399;
    --success-light: #064e3b;
    --warning: #fbbf24;
    --warning-light: #451a03;
    --danger: #f87171;
    --danger-light: #7f1d1d;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* =============================================
   RESET & BASE STYLES
   ============================================= */

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

html {
    height: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--font-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
    min-height: 100vh;
    transition: background-color var(--transition), color var(--transition);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* =============================================
   TYPOGRAPHY
   ============================================= */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: var(--font-3xl); }
h2 { font-size: var(--font-2xl); }
h3 { font-size: var(--font-xl); }
h4 { font-size: var(--font-lg); }
h5 { font-size: var(--font-base); }
h6 { font-size: var(--font-sm); }

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-hover);
}

/* =============================================
   LAYOUT - DASHBOARD CONTAINER
   ============================================= */

.dashboard-container {
    display: flex;
    min-height: 100vh;
    background-color: var(--background);
}

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

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--surface);
    border-right: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 1000;
    transition: transform var(--transition);
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar.collapsed {
    width: var(--sidebar-collapsed);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background-color: var(--surface);
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-xl);
    font-weight: 700;
    color: var(--primary);
}

.logo-icon {
    font-size: var(--font-2xl);
}

.sidebar.collapsed .logo-text {
    display: none;
}

.sidebar-close {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: var(--font-lg);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius);
    transition: all var(--transition-fast);
}

.sidebar-close:hover {
    background-color: var(--surface-hover);
    color: var(--text-primary);
}

/* Navigation */
.sidebar-nav {
    padding: var(--spacing-lg) 0;
}

.nav-section {
    margin-bottom: var(--spacing-xl);
}

.nav-section-title {
    padding: 0 var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

.sidebar.collapsed .nav-section-title {
    display: none;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: var(--font-sm);
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
    position: relative;
}

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

.nav-item.active {
    background-color: var(--primary-light);
    color: var(--primary);
    border-left-color: var(--primary);
}

.nav-icon {
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}

.sidebar.collapsed .nav-text {
    display: none;
}

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

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left var(--transition);
}

.sidebar.collapsed + .main-content {
    margin-left: var(--sidebar-collapsed);
}

/* =============================================
   HEADER
   ============================================= */

.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    height: var(--header-height);
    background-color: var(--surface);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    gap: var(--spacing-lg);
}

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

.sidebar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: var(--font-lg);
    cursor: pointer;
    border-radius: var(--radius);
    transition: all var(--transition-fast);
}

.sidebar-toggle:hover {
    background-color: var(--surface-hover);
    color: var(--text-primary);
}

.breadcrumb {
    font-size: var(--font-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
}

.app-selector-wrapper {
    position: relative;
}

.app-selector {
    min-width: 200px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background-color: var(--surface);
    color: var(--text-primary);
    font-size: var(--font-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.app-selector:hover {
    border-color: var(--primary);
}

.app-selector:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

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

.date-range-picker {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.date-input {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background-color: var(--surface);
    color: var(--text-primary);
    font-size: var(--font-sm);
    transition: all var(--transition-fast);
}

.date-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.date-separator {
    color: var(--text-muted);
    font-size: var(--font-sm);
}

.refresh-btn,
.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.refresh-btn:hover,
.theme-toggle:hover {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
}

.user-menu {
    position: relative;
}

.user-menu-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.user-menu-toggle:hover {
    background-color: var(--surface-hover);
    border-color: var(--primary);
}

.user-name {
    font-size: var(--font-sm);
    font-weight: 500;
}

.user-menu-dropdown {
    position: absolute;
    top: calc(100% + var(--spacing-sm));
    right: 0;
    min-width: 200px;
    background-color: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-md);
    display: none;
    z-index: 1000;
}

.user-menu-dropdown.show {
    display: block;
}

.user-info {
    padding-bottom: var(--spacing-md);
}

.user-info .user-name {
    font-weight: 600;
    color: var(--text-primary);
}

.user-role {
    font-size: var(--font-xs);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.menu-divider {
    height: 1px;
    background-color: var(--border);
    margin: var(--spacing-md) 0;
}

.menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.menu-item:hover {
    background-color: var(--surface-hover);
    color: var(--text-primary);
}

/* =============================================
   CONTENT AREA
   ============================================= */

.content-area {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    color: var(--text-muted);
}

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading-text {
    font-size: var(--font-sm);
    font-weight: 500;
}

/* =============================================
   RESPONSIVE DESIGN
   ============================================= */

/* Tablet */
@media (max-width: 1024px) {
    .header-center {
        flex: 0;
    }
    
    .date-range-picker {
        display: none;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .sidebar-close {
        display: block;
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .main-header {
        padding: 0 var(--spacing-md);
    }
    
    .user-name {
        display: none;
    }
    
    .breadcrumb {
        font-size: var(--font-base);
    }
    
    .content-area {
        padding: var(--spacing-md);
    }
    
    .app-selector {
        min-width: 150px;
    }
}

/* Mobile Overlay */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    display: none;
    transition: opacity var(--transition);
}

.sidebar-overlay.show {
    display: block;
}

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

.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Transitions */
.fade-in {
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}