/* =====================================================
   LIFE JOURNEY TRACKER - MAIN STYLES
   Glassmorphism Design System with Dark Mode
   ===================================================== */

/* ============ CSS VARIABLES ============ */
:root {
    /* Colors - Dark Blue Theme */
    --bg-primary: #0a0e27;
    --bg-secondary: #151b3d;
    --bg-tertiary: #1e2749;
    
    /* Glass Effect */
    --glass-bg: rgba(21, 27, 61, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    
    /* Brand Colors */
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --secondary: #8b5cf6;
    --secondary-dark: #7c3aed;
    
    /* Status Colors */
    --success: #10b981;
    --success-light: #34d399;
    --warning: #f59e0b;
    --warning-light: #fbbf24;
    --danger: #ef4444;
    --danger-light: #f87171;
    --info: #06b6d4;
    
    /* Text Colors */
    --text-primary: #e2e8f0;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-disabled: #64748b;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Sidebar */
    --sidebar-width: 280px;
    --mobile-header-height: 64px;
    
    /* Z-Index Scale */
    --z-sidebar: 100;
    --z-header: 200;
    --z-modal: 1000;
    --z-toast: 2000;
}

/* ============ RESET & BASE ============ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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;
    overflow-x: hidden;
    min-height: 100vh;
    
    /* Animated gradient background */
    background: linear-gradient(135deg, 
        var(--bg-primary) 0%, 
        #0f1535 25%, 
        var(--bg-primary) 50%, 
        #1a1f45 75%, 
        var(--bg-primary) 100%);
    background-size: 400% 400%;
    animation: gradientShift 15s ease infinite;
}

/* ============ SIDEBAR ============ */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--glass-border);
    padding: var(--spacing-xl) 0;
    display: flex;
    flex-direction: column;
    z-index: var(--z-sidebar);
    transition: transform var(--transition-base);
}

.sidebar-header {
    padding: 0 var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo i {
    color: var(--primary);
    width: 32px;
    height: 32px;
}

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

.close-sidebar:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 0 var(--spacing-md);
}

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

.nav-item i {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-item span:first-of-type {
    flex: 1;
}

.nav-badge {
    background: var(--primary);
    color: white;
    padding: 0.125rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.nav-item:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--primary);
    color: white;
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 60%;
    background: white;
    border-radius: 0 999px 999px 0;
}

.sidebar-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--glass-border);
}

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

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: white;
    font-size: 0.875rem;
}

.user-info {
    flex: 1;
}

.user-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.user-status {
    font-size: 0.75rem;
    color: var(--success);
}

/* ============ MOBILE HEADER ============ */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--mobile-header-height);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: 0 var(--spacing-lg);
    align-items: center;
    justify-content: space-between;
    z-index: var(--z-header);
}

.menu-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.menu-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.mobile-logo {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-primary);
}

.mobile-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.icon-btn {
    position: relative;
    background: none;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.badge {
    position: absolute;
    top: 0;
    right: 0;
    background: var(--danger);
    color: white;
    font-size: 0.625rem;
    font-weight: 700;
    padding: 0.125rem 0.375rem;
    border-radius: 999px;
    line-height: 1;
}

/* ============ MAIN CONTENT ============ */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    padding: var(--spacing-2xl);
    transition: margin-left var(--transition-base);
}

/* ============ CUSTOM SCROLLBAR ============ */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ============ LOADING OVERLAY ============ */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 14, 39, 0.8);
    backdrop-filter: blur(10px);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: var(--spacing-lg);
    z-index: 999;
}

.loading-overlay.active {
    display: flex;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(59, 130, 246, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-overlay p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ============ TOAST NOTIFICATIONS ============ */
.toast-container {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* ============ MODAL ============ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 14, 39, 0.8);
    backdrop-filter: blur(10px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    padding: var(--spacing-xl);
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--glass-shadow);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalSlideIn var(--transition-base);
}

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

.modal-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-xl);
    overflow-y: auto;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 240px;
    }
}

@media (max-width: 768px) {
    .mobile-header {
        display: flex;
    }
    
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .close-sidebar {
        display: block;
    }
    
    .main-content {
        margin-left: 0;
        margin-top: var(--mobile-header-height);
        padding: var(--spacing-lg);
    }
    
    .toast-container {
        top: calc(var(--mobile-header-height) + var(--spacing-md));
        right: var(--spacing-md);
        left: var(--spacing-md);
    }
}

@media (max-width: 640px) {
    html {
        font-size: 14px;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .modal {
        max-width: 100%;
        margin: var(--spacing-md);
    }
}