:root {
    /* Modern Color Palette */
    --primary-color: #6366f1;
    --primary-hover: #5855eb;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    
    /* Glass Theme Colors */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --glass-backdrop: blur(20px);
    
    /* Dark Theme */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    
    /* 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;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Glass Morphism Components */
.glass {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-backdrop);
    -webkit-backdrop-filter: var(--glass-backdrop);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    transition: none;
}

/* Navigation */
.navbar {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--spacing-sm) 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-brand img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.navbar-brand:hover {
    color: var(--text-primary);
    text-decoration: none;
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    background: var(--glass-bg);
}

/* Mobile Navigation */
.mobile-nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-sm);
}

@media (max-width: 768px) {
    .mobile-nav-toggle {
        display: block;
    }
    
    .navbar-nav {
        position: fixed;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(15, 23, 42, 0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: var(--spacing-lg);
        transform: translateY(-100vh);
        transition: transform 0.3s ease;
    }
    
    .navbar-nav.active {
        transform: translateY(0);
    }
}

/* Layout */
.main-container {
    padding-top: 80px;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 80px;
    bottom: 0;
    width: 280px;
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--glass-border);
    padding: var(--spacing-lg);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 900;
}

.sidebar.active {
    transform: translateX(0);
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.sidebar-profile {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--glass-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--glass-border);
}

.profile-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
    border: 3px solid var(--primary-color);
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    margin-bottom: var(--spacing-xs);
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.sidebar-menu a:hover, .sidebar-menu a.active {
    color: var(--text-primary);
    background: var(--glass-bg);
    transform: translateX(4px);
}

@media (min-width: 1024px) {
    .sidebar {
        position: relative;
        transform: translateX(0);
        top: 0;
        height: auto;
    }
    
    .main-content {
        margin-left: 300px;
    }
}

/* Cards */
.card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-backdrop);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: none;
}

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

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.card-body {
    padding: 0;
}

/* Forms */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    background: rgba(255, 255, 255, 0.08);
}

.form-control::placeholder {
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.3);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover {
    background: #059669;
    transform: translateY(-1px);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-1px);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

/* Status Cards */
.status-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    transition: none;
}

.status-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.status-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-color);
    border-radius: var(--radius-md);
    font-size: 1.5rem;
    color: white;
}

.status-content h3 {
    margin: 0 0 var(--spacing-xs);
    font-size: 1.125rem;
    color: var(--text-primary);
}

.status-content p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Mood Grid */
.mood-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.mood-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.mood-option:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.mood-option.selected {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--primary-color);
}

.mood-icon {
    font-size: 2rem;
}

/* Activity List */
.activity-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.activity-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    margin-bottom: var(--spacing-sm);
    transition: all 0.3s ease;
}

.activity-item:hover {
    transform: translateX(2px);
    background: rgba(255, 255, 255, 0.1);
}

.activity-item.selected {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--primary-color);
}

/* Letter Templates */
.letter-templates {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.letter-template {
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    margin-bottom: var(--spacing-md);
}

.letter-template:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.letter-template.selected {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--primary-color);
}

/* Letter List */
.letter-list-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-primary);
    text-decoration: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    min-height: 48px;
}

.letter-list-item:last-child {
    border-bottom: none;
}

.letter-list-item:hover {
    background: rgba(255, 255, 255, 0.03);
}

.letter-list-item.unread {
    background: rgba(99, 102, 241, 0.05);
    border-left: 3px solid var(--primary-color);
}

.letter-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    color: var(--text-muted);
    flex-shrink: 0;
}

.letter-content {
    flex: 1;
    min-width: 0;
    line-height: 1.3;
}

.letter-title {
    font-size: 0.875rem;
    margin: 0;
    color: var(--text-primary);
    font-weight: 500;
}

.letter-meta {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 1px;
}

.letter-preview {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 2px;
    line-height: 1.2;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.letter-time {
    font-size: 0.7rem;
    color: var(--text-muted);
    flex-shrink: 0;
    margin-left: var(--spacing-xs);
}

@media (max-width: 640px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .card {
        padding: var(--spacing-md);
    }
    
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .mood-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .letter-list-item {
        padding: var(--spacing-sm);
    }
    
    .letter-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .letter-time {
        font-size: 0.7rem;
    }
    
    .letter-preview {
        font-size: 0.8rem;
    }
}

/* Text colors */
.text-primary { color: var(--primary-color) !important; }
.text-secondary { color: var(--text-secondary) !important; }
.text-muted { color: var(--text-muted) !important; }
.text-success { color: var(--success-color) !important; }
.text-warning { color: var(--warning-color) !important; }
.text-danger { color: var(--danger-color) !important; }

/* Additional spacing utilities */
.ms-2 { margin-left: var(--spacing-sm) !important; }
.me-2 { margin-right: var(--spacing-sm) !important; }

/* Background utilities */
.bg-glass { background: rgba(255, 255, 255, 0.05) !important; }

/* Font utilities */
.font-medium { font-weight: 500 !important; }
.text-sm { font-size: 0.875rem !important; }
.text-xs { font-size: 0.75rem !important; }

/* Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-xs); }
.p-2 { padding: var(--spacing-sm); }
.p-3 { padding: var(--spacing-md); }
.p-4 { padding: var(--spacing-lg); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--spacing-xs); }
.gap-2 { gap: var(--spacing-sm); }
.gap-3 { gap: var(--spacing-md); }
.gap-4 { gap: var(--spacing-lg); }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }

.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* Space utilities */
.space-y-2 > * + * { margin-top: var(--spacing-sm); }
.space-y-3 > * + * { margin-top: var(--spacing-md); }
.space-y-4 > * + * { margin-top: var(--spacing-lg); }

/* Specific spacing fixes */
.grid > * {
    margin-bottom: 0;
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

/* Fix flex utility spacing */
.flex-1 {
    flex: 1 1 0%;
}

.min-w-0 {
    min-width: 0;
}

.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Badge styles */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    white-space: nowrap;
}

.bg-primary { background-color: var(--primary-color); color: white; }
.bg-secondary { background-color: var(--glass-bg); color: var(--text-primary); }
.bg-success { background-color: var(--success-color); color: white; }
.bg-warning { background-color: var(--warning-color); color: #000; }
.bg-danger { background-color: var(--danger-color); color: white; }

/* Icon fixes for Material Icons fallback */
.material-icons-fallback {
    font-family: 'Material Icons', 'Font Awesome 6 Free', 'Bootstrap Icons';
    font-weight: normal;
    font-style: normal;
    font-size: inherit;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    display: inline-block;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    -webkit-font-feature-settings: 'liga';
    -webkit-font-smoothing: antialiased;
}

/* Ensure icons display properly */
.bi::before,
.material-icons {
    display: inline-block;
    vertical-align: middle;
}