:root {
    /* Color Palette */
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --light-gray: #e9ecef;
    --success-color: #4cc9f0;
    --warning-color: #f72585;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --shadow-inset: inset 0 1px 2px rgba(0,0,0,0.075);
    
    /* Transitions */
    --transition-fast: all 0.15s ease;
    --transition-normal: all 0.3s ease;
    --transition-slow: all 0.5s ease;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-circle: 50%;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
}

/* Base Styles */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Fira Sans', 'Droid Sans', 
                 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: var(--light-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--space-sm);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--space-md);
}

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

a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Layout */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 100%;
    background-color: rgb(255, 255, 255);
    position: relative;
    overflow: hidden;
}

/* Header Styles */
.app-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--space-md);
    position: relative;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

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

/* Navigation Styles */
.tool-nav {
    background-color: white;
    border-bottom: 1px solid var(--light-gray);
    position: sticky;
    top: 0;
    z-index: 90;
    box-shadow: var(--shadow-sm);
}

.nav-scroll-container {
    display: flex;
    overflow-x: auto;
    scrollbar-width: none; /* Firefox */
    -ms-overflow-style: none; /* IE/Edge */
    padding: var(--space-sm);
}

.nav-scroll-container::-webkit-scrollbar {
    display: none; /* Chrome/Safari */
}

.nav-item {
    padding: var(--space-sm) var(--space-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 0.85rem;
    color: var(--gray-color);
    cursor: pointer;
    transition: var(--transition-normal);
    min-width: 70px;
    border-radius: var(--radius-md);
    margin: 0 var(--space-xs);
    flex-shrink: 0;
    position: relative;
    border: none;
    background: transparent;
}

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: var(--space-xs);
}

.nav-item:hover {
    color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.05);
}

.nav-item.active {
    color: var(--primary-color);
    background-color: rgba(67, 97, 238, 0.1);
    font-weight: 600;
}

.nav-item.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
}

/* Main Content Area */
.tool-container {
    flex: 1;
    padding: var(--space-md);
    overflow-y: auto;
    background-color: var(--light-color);
}

.tool-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tool-content.active {
    display: block;
}

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

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: white;
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    transform: translateY(-20px);
    transition: var(--transition-normal);
}

.modal.active .modal-content {
    transform: translateY(0);
}

.modal-header {
    padding: var(--space-md);
    border-bottom: 1px solid var(--light-gray);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background-color: white;
    z-index: 10;
}

.close-modal {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-color);
    transition: var(--transition-fast);
}

.close-modal:hover {
    color: var(--dark-color);
}

.modal-body {
    padding: var(--space-md);
}

/* Form Styles */
.form-group {
    margin-bottom: var(--space-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-xs);
    font-weight: 500;
    color: var(--dark-color);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: var(--space-sm);
    border: 1px solid var(--light-gray);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.2);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.type-options {
    display: flex;
    gap: var(--space-md);
}

.type-options input[type="radio"] {
    display: none;
}

.type-options label {
    flex: 1;
    text-align: center;
    padding: var(--space-sm);
    border: 1px solid var(--light-gray);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
}

.type-options input[type="radio"]:checked + label {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.color-options {
    display: flex;
    gap: var(--space-sm);
}

.color-options input[type="radio"] {
    display: none;
}

.color-options label {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-circle);
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
}

.color-options input[type="radio"]:checked + label::after {
    content: '\f00c';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 0.8rem;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

.cancel-btn, .save-btn {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

.cancel-btn {
    background-color: var(--light-gray);
    color: var(--dark-color);
    border: none;
}

.cancel-btn:hover {
    background-color: #d1d5db;
}

.save-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

.save-btn:hover {
    background-color: var(--primary-dark);
}

/* Install Prompt */
.install-prompt {
    position: fixed;
    bottom: -100%;
    left: 0;
    width: 100%;
    background-color: white;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    padding: var(--space-md);
    z-index: 1000;
    transition: var(--transition-normal);
}

.install-prompt.active {
    bottom: 0;
}

.prompt-content {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
}

.prompt-actions {
    display: flex;
    gap: var(--space-sm);
}

.prompt-actions button {
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}

#install-cancel {
    background-color: var(--light-gray);
    color: var(--dark-color);
    border: none;
}

#install-confirm {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

/* Loading Overlay Styles */
#loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
  opacity: 1;
  transition: opacity 0.5s ease;
}

.loading-content {
  text-align: center;
  color: var(--dark-color);
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(67, 97, 238, 0.2);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1rem;
}

#loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
  
}


@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Dark mode loading overlay */
.dark-mode #loading-overlay {
  background-color: rgba(30, 30, 30, 0.95);
}

.dark-mode .loading-content {
  color: #e0e0e0;
}


/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--gray-color);
}

/* Dark Mode Styles */
.dark-mode {
    background-color: #121212;
    color: #e0e0e0;
}

.dark-mode .app-container {
    background-color: #1e1e1e;
}

.dark-mode .app-header {
    background: linear-gradient(135deg, #3730a3, #312e81);
}

.dark-mode .tool-nav {
    background-color: #252525;
    border-bottom-color: #333;
}

.dark-mode .nav-item {
    color: #b0b0b0;
}

.dark-mode .nav-item:hover {
    background-color: #333;
}

.dark-mode .nav-item.active {
    color: var(--accent-color);
    background-color: rgba(72, 149, 239, 0.1);
}

.dark-mode .tool-container {
    background-color: #121212;
}

.dark-mode .modal-content,
.dark-mode .notes-sidebar,
.dark-mode .notes-editor,
.dark-mode .todo-list-container,
.dark-mode .expense-summary .summary-card,
.dark-mode .expense-chart-container,
.dark-mode .expense-list-container,
.dark-mode .planner-events,
.dark-mode .vault-container,
.dark-mode .music-scroll-section {
    background-color: #252525;
    box-shadow: 0 2px 4px rgba(0,0,0,0.3);
    color: #e0e0e0;
} 

.dark-mode .fixed-music-player{
    background-color: #212528;
    border-color: #ffffff;
}

.dark-mode .card-header,
.dark-mode .todo-list-header,
.dark-mode .expense-list-header,
.dark-mode .planner-header {
    border-bottom-color: #333;
}

.dark-mode .empty-state {
    color: #777;
}

.dark-mode .option-btn {
    background-color: #333;
    border-color: #444;
    color: #e0e0e0;
}

.dark-mode .option-btn:hover {
    background-color: #3a3a3a;
}

.dark-mode .calculator-container {
    background-color: #252525;
}

.dark-mode .calculator-display {
    background-color: #1a1a1a;
}

.dark-mode .calc-btn {
    background-color: #333;
    color: #e0e0e0;
}

.dark-mode .calc-btn:hover {
    background-color: #3a3a3a;
}

.dark-mode .calc-btn.function {
    background-color: #2d2d2d;
    color: var(--accent-color);
}

.dark-mode .calc-btn.operation,
.dark-mode .calc-btn.equals {
    color: white;
}

.dark-mode #theme-toggle i {
    cursor: pointer;
    color: var(--primary-color);
}

/* Responsive Design */
@media (max-width: 1200px) {
    .notes-content {
        grid-template-columns: 200px 1fr;
    }
}

@media (max-width: 992px) {
    .dashboard-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
    
    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .notes-content {
        grid-template-columns: 1fr;
    }
    
    .notes-sidebar {
        order: 2;
    }
    
    .notes-editor {
        order: 1;
        margin-bottom: var(--space-lg);
    }
}

@media (max-width: 768px) {
    .app-header h1 {
        font-size: 1.5rem;
    }
    
    .header-actions {
        gap: var(--space-sm);
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .actions-grid {
        grid-template-columns: 1fr;
    }
    
    .planner-events {
        margin-top: var(--space-lg);
    }
    
    .insights-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 576px) {
    .app-header {
        padding: var(--space-sm);
    }
    
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }
    
    .header-actions {
        width: 100%;
        justify-content: space-between;
    }
    
    .nav-item {
        min-width: 60px;
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.75rem;
    }
    
    .nav-item i {
        font-size: 1rem;
        margin-bottom: 0;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }
    
    .category-buttons {
        flex-direction: column;
    }
    
    .category-btn {
        width: 100%;
    }
}