/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    
    /* Neutral Colors */
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --medium-gray: #e9ecef;
    --dark-gray: #6c757d;
    --text-primary: #2c3e50;
    --text-secondary: #495057;
    --text-muted: #6c757d;
    
    /* Background Colors */
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-accent: #f8f9fa;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 8px 16px rgba(0, 0, 0, 0.15);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    
    /* Layout Breakpoints */
    --breakpoint-sm: 576px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 992px;
    --breakpoint-xl: 1200px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    font-size: var(--font-size-base);
}

/* App Container */
#app {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    min-height: 100vh;
    display: grid;
    grid-template-rows: auto 1fr;
    gap: var(--spacing-xl);
}

/* Header */
.app-header {
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-xl);
    background: var(--primary-gradient);
    color: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.app-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/><circle cx="50" cy="10" r="0.5" fill="white" opacity="0.05"/><circle cx="10" cy="60" r="0.5" fill="white" opacity="0.05"/><circle cx="90" cy="40" r="0.5" fill="white" opacity="0.05"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
}

.app-header h1 {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.app-description {
    font-size: var(--font-size-lg);
    opacity: 0.95;
    position: relative;
    z-index: 1;
    font-weight: 400;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: start;
}

/* Sections */
section {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--medium-gray);
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

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

section h2 {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: var(--spacing-sm);
    position: relative;
    font-weight: 600;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: var(--radius-sm);
}

/* Form Styles */
.book-form {
    display: grid;
    gap: var(--spacing-lg);
}

.form-group {
    display: grid;
    gap: var(--spacing-sm);
}

.form-group label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input {
    padding: var(--spacing-md);
    border: 2px solid var(--medium-gray);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-normal);
    background: var(--bg-secondary);
    font-family: inherit;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15), var(--shadow-md);
    transform: translateY(-2px);
    background: var(--white);
}

.form-group input:hover:not(:focus) {
    border-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.form-group input:invalid {
    border-color: var(--danger-color);
    animation: shake 0.5s ease-in-out;
}

.form-group input:invalid:focus {
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.15), var(--shadow-md);
}

.form-group input::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
    transition: opacity var(--transition-normal);
}

.form-group input:focus::placeholder {
    opacity: 0.5;
    transform: translateY(-2px);
}

/* Form Group Enhancements */
.form-group {
    position: relative;
}

.form-group label {
    transition: color var(--transition-normal);
}

.form-group:focus-within label {
    color: var(--primary-color);
}

/* Validation States */
.form-group.has-success label {
    color: var(--success-color);
}

.form-group.has-error label {
    color: var(--danger-color);
}

.form-group input.valid {
    border-color: var(--success-color);
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="%2328a745" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="20,6 9,17 4,12"></polyline></svg>');
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 40px;
}

.form-group input.error {
    border-color: var(--danger-color);
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="%23dc3545" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"></circle><line x1="15" y1="9" x2="9" y2="15"></line><line x1="9" y1="9" x2="15" y2="15"></line></svg>');
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 40px;
    animation: shake 0.5s ease-in-out;
}

.form-group input.valid:focus {
    box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.15), var(--shadow-md);
}

.form-group input.error:focus {
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.15), var(--shadow-md);
}

/* Field Error Messages */
.field-error {
    color: var(--danger-color);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    animation: fadeInUp 0.3s ease-out;
}

.field-error::before {
    content: '⚠️';
    font-size: var(--font-size-xs);
}

/* Form Validation Summary */
.validation-summary {
    background: rgba(248, 215, 218, 0.95);
    color: #721c24;
    border: 1px solid #f5c6cb;
    border-left: 4px solid var(--danger-color);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.3s ease-out;
}

.validation-summary h4 {
    margin: 0 0 var(--spacing-sm) 0;
    font-size: var(--font-size-base);
    font-weight: 600;
}

.validation-summary ul {
    margin: 0;
    padding-left: var(--spacing-lg);
}

.validation-summary li {
    margin-bottom: var(--spacing-xs);
}

/* Real-time Validation Indicators */
.form-group input:not(:placeholder-shown):valid {
    border-color: var(--success-color);
}

.form-group input:not(:placeholder-shown):invalid {
    border-color: var(--danger-color);
}

/* Loading State for Validation */
.form-group.validating input {
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="%236c757d" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="3"></circle><path d="m12 1 0 6m0 6 0 6m11-7-6 0m-6 0-6 0"></path></svg>');
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 40px;
}

.form-group.validating input::after {
    animation: spin 1s linear infinite;
}

/* Security Warning Styles */
.security-warning {
    background: rgba(255, 243, 205, 0.95);
    color: #856404;
    border: 1px solid #ffeaa7;
    border-left: 4px solid var(--warning-color);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.security-warning::before {
    content: '🔒';
    font-size: var(--font-size-sm);
}

/* Character Counter */
.character-counter {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-align: right;
    margin-top: var(--spacing-xs);
    transition: color var(--transition-normal);
}

.character-counter.warning {
    color: var(--warning-color);
}

.character-counter.error {
    color: var(--danger-color);
}

/* Button Styles */
.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    position: relative;
    overflow: hidden;
    font-family: inherit;
    text-transform: none;
    letter-spacing: 0.3px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left var(--transition-slow);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--primary-gradient);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
    filter: brightness(1.1);
}

.btn-primary:active {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--secondary-color);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary:active {
    transform: translateY(0);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #20c997 100%);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-success:hover {
    background: linear-gradient(135deg, #218838 0%, #1ea080 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-success:active {
    transform: translateY(0);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color) 0%, #e85d75 100%);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-danger:hover {
    background: linear-gradient(135deg, #c82333 0%, #d63c5e 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-danger:active {
    transform: translateY(0);
}

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

/* Button Loading State */
.btn.loading {
    pointer-events: none;
    opacity: 0.7;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Task List Styles */
.task-category {
    margin-bottom: var(--spacing-xl);
}

.task-category h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.task-list {
    display: grid;
    gap: var(--spacing-md);
}

.task-item {
    background: var(--bg-accent);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
    display: grid;
    gap: var(--spacing-md);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.task-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(102, 126, 234, 0.02) 100%);
    pointer-events: none;
}

.task-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    background: var(--white);
}

.task-item:hover .task-info h4 {
    color: var(--primary-color);
}

.task-item:hover .task-actions .btn {
    transform: scale(1.02);
}

/* Task Item States */
.task-item.adding {
    animation: fadeInScale 0.5s ease-out;
}

.task-item.removing {
    animation: fadeOut 0.3s ease-in forwards;
}

.task-item.completing {
    animation: pulse 0.6s ease-in-out;
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: scale(0.9) translateY(-10px);
    }
}

.task-item.completed {
    border-left-color: var(--success-color);
    opacity: 0.85;
}

.task-item.completed::before {
    background: linear-gradient(135deg, transparent 0%, rgba(40, 167, 69, 0.02) 100%);
}

.task-info {
    position: relative;
    z-index: 1;
}

.task-info h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    font-weight: 600;
    line-height: 1.4;
}

.task-info .author {
    color: var(--text-muted);
    font-style: italic;
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xs);
}

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

.task-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

/* Enhanced Message Container */
.message-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    max-width: 420px;
    pointer-events: none;
}

.message {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.4s ease-out;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
    pointer-events: auto;
    opacity: 0;
    transform: translateX(100%);
    transition: all var(--transition-normal);
}

.message.show {
    opacity: 1;
    transform: translateX(0);
}

.message::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: inherit;
    opacity: 0.9;
    z-index: -1;
}

.message.success {
    background: rgba(212, 237, 218, 0.95);
    color: #155724;
    border: 1px solid #c3e6cb;
    border-left: 4px solid var(--success-color);
}

.message.error {
    background: rgba(248, 215, 218, 0.95);
    color: #721c24;
    border: 1px solid #f5c6cb;
    border-left: 4px solid var(--danger-color);
}

.message.info {
    background: rgba(209, 236, 241, 0.95);
    color: #0c5460;
    border: 1px solid #bee5eb;
    border-left: 4px solid var(--info-color);
}

.message.warning {
    background: rgba(255, 243, 205, 0.95);
    color: #856404;
    border: 1px solid #ffeaa7;
    border-left: 4px solid var(--warning-color);
}

/* Message Content Structure */
.message-content {
    position: relative;
    z-index: 1;
    padding-right: 30px; /* Space for close button */
}

.message-text {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.message-details {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    margin-top: var(--spacing-xs);
    white-space: pre-line;
    line-height: 1.3;
}

.message-error-code {
    font-size: var(--font-size-xs);
    font-family: monospace;
    background: rgba(0, 0, 0, 0.1);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-xs);
    display: inline-block;
}

/* Message Actions */
.message-actions {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
    flex-wrap: wrap;
}

.message-action-btn {
    font-size: var(--font-size-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    min-height: auto;
}

/* Message Progress Bar */
.message-progress {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.message-progress-bar {
    height: 100%;
    background: currentColor;
    width: 100%;
    transform: translateX(-100%);
    animation: progress-countdown linear;
}

@keyframes progress-countdown {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}

/* Message Close Button */
.message-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: transparent;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: inherit;
    opacity: 0.7;
    transition: opacity var(--transition-normal);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    z-index: 2;
}

.message-close:hover {
    opacity: 1;
    background-color: rgba(0, 0, 0, 0.1);
}

.message-close:focus {
    outline: 2px solid currentColor;
    outline-offset: 1px;
    opacity: 1;
}

/* Message Animations */
.message.dismissing {
    animation: slideOut 0.3s ease-in forwards;
}

.message.duplicate-flash {
    animation: duplicateFlash 0.5s ease-in-out;
}

@keyframes slideOut {
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

@keyframes duplicateFlash {
    0%, 100% {
        transform: scale(1);
        box-shadow: var(--shadow-lg);
    }
    50% {
        transform: scale(1.05);
        box-shadow: var(--shadow-xl), 0 0 20px rgba(102, 126, 234, 0.3);
    }
}

/* Priority-based styling */
.message[data-priority="critical"] {
    border-width: 2px;
    box-shadow: var(--shadow-xl), 0 0 20px rgba(220, 53, 69, 0.2);
    animation: slideIn 0.4s ease-out, criticalPulse 2s ease-in-out infinite;
}

@keyframes criticalPulse {
    0%, 100% {
        box-shadow: var(--shadow-xl), 0 0 20px rgba(220, 53, 69, 0.2);
    }
    50% {
        box-shadow: var(--shadow-xl), 0 0 30px rgba(220, 53, 69, 0.4);
    }
}

/* Animations */
@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    10%, 30%, 50%, 70%, 90% {
        transform: translateX(-5px);
    }
    20%, 40%, 60%, 80% {
        transform: translateX(5px);
    }
}

@keyframes bounce {
    0%, 20%, 53%, 80%, 100% {
        transform: translateY(0);
    }
    40%, 43% {
        transform: translateY(-15px);
    }
    70% {
        transform: translateY(-7px);
    }
    90% {
        transform: translateY(-3px);
    }
}

/* Page Load Animations */
.app-header {
    animation: fadeInUp 0.8s ease-out;
}

.main-content section:nth-child(1) {
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.main-content section:nth-child(2) {
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.task-item {
    animation: fadeInScale 0.5s ease-out;
}

.task-item:nth-child(even) {
    animation-delay: 0.1s;
}

.task-item:nth-child(odd) {
    animation-delay: 0.05s;
}

/* Responsive Design */

/* Large Desktop */
@media (min-width: 1200px) {
    #app {
        max-width: 1400px;
        padding: var(--spacing-xxl);
    }
    
    .main-content {
        grid-template-columns: 1fr 1.2fr;
        gap: var(--spacing-xxl);
    }
    
    .app-header {
        padding: 4rem var(--spacing-xxl);
    }
    
    .app-header h1 {
        font-size: 3.5rem;
    }
}

/* Desktop */
@media (max-width: 1199px) and (min-width: 992px) {
    .main-content {
        grid-template-columns: 1fr 1fr;
    }
}

/* Tablet */
@media (max-width: 991px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    #app {
        padding: var(--spacing-lg);
    }
    
    .app-header {
        padding: var(--spacing-xl) var(--spacing-lg);
    }
    
    .app-header h1 {
        font-size: var(--font-size-3xl);
    }
    
    section {
        padding: var(--spacing-lg);
    }
}

/* Mobile Large */
@media (max-width: 768px) {
    #app {
        padding: var(--spacing-md);
        gap: var(--spacing-lg);
    }
    
    .app-header {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .app-header h1 {
        font-size: var(--font-size-3xl);
    }
    
    .app-description {
        font-size: var(--font-size-base);
    }
    
    section {
        padding: var(--spacing-lg);
    }
    
    .task-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .task-item {
        padding: var(--spacing-md);
    }
}

/* Mobile Medium */
@media (max-width: 576px) {
    #app {
        padding: var(--spacing-sm);
    }
    
    .app-header {
        padding: var(--spacing-md);
    }
    
    .app-header h1 {
        font-size: var(--font-size-2xl);
    }
    
    section {
        padding: var(--spacing-md);
    }
    
    .message-container {
        left: var(--spacing-sm);
        right: var(--spacing-sm);
        max-width: none;
    }
    
    .form-group input {
        padding: var(--spacing-sm);
    }
    
    .task-info h4 {
        font-size: var(--font-size-base);
    }
}

/* Mobile Small */
@media (max-width: 480px) {
    .app-header h1 {
        font-size: var(--font-size-xl);
    }
    
    .app-description {
        font-size: var(--font-size-sm);
    }
    
    section h2 {
        font-size: var(--font-size-lg);
    }
    
    .task-category h3 {
        font-size: var(--font-size-base);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Enhanced Focus Styles for Keyboard Navigation */
.btn:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 6px rgba(102, 126, 234, 0.2);
}

input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Interactive Element States */
.task-item:focus-within {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-md);
}

section:focus-within {
    box-shadow: var(--shadow-lg), 0 0 0 3px rgba(102, 126, 234, 0.1);
}

/* Hover Effects for Interactive Elements */
.task-category h3:hover {
    color: var(--primary-color);
    cursor: default;
}

.app-header:hover {
    transform: scale(1.01);
}

/* Button Group Interactions */
.task-actions .btn + .btn {
    margin-left: 0;
}

.task-actions:hover .btn:not(:hover) {
    opacity: 0.7;
    transform: scale(0.98);
}

/* Form Submission States */
.book-form.submitting {
    pointer-events: none;
    opacity: 0.8;
}

.book-form.submitting .btn {
    animation: pulse 1s infinite;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .btn-primary {
        background: #000;
        border: 2px solid #fff;
    }
    
    .task-item {
        border: 2px solid #000;
    }
}
/* Manual Post Text Styles */
.manual-post-text {
    background: #fff3cd !important;
    color: #856404 !important;
    border: 1px solid #ffeaa7 !important;
    max-width: none;
}

.manual-post-header {
    font-weight: bold;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.manual-post-content {
    background: #f8f9fa;
    padding: 0.75rem;
    border-radius: 4px;
    border: 1px solid #dee2e6;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    white-space: pre-wrap;
    word-break: break-word;
    margin-bottom: 0.75rem;
    max-height: 150px;
    overflow-y: auto;
}

.copy-text-btn {
    background: #6c757d !important;
    color: white !important;
    border: none !important;
    padding: 0.375rem 0.75rem !important;
    font-size: 0.8rem !important;
    margin: 0 !important;
}

.copy-text-btn:hover {
    background: #5a6268 !important;
}

.copy-text-btn:focus {
    outline: 2px solid #6c757d;
    outline-offset: 2px;
}
/* A
dvanced Micro-Interactions */

/* Smooth Page Transitions */
* {
    scroll-behavior: smooth;
}

/* Enhanced Section Interactions */
section {
    transform-origin: center top;
}

section:hover h2::after {
    width: 100px;
    transition: width var(--transition-normal);
}

/* Task Item Micro-Interactions */
.task-item .task-info h4 {
    transition: all var(--transition-normal);
}

.task-item:hover .task-info h4 {
    transform: translateX(5px);
}

/* Button Ripple Effect */
.btn {
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::after {
    width: 300px;
    height: 300px;
}

/* Form Field Floating Labels Effect */
.form-group {
    position: relative;
}

.form-group.floating label {
    position: absolute;
    top: 50%;
    left: var(--spacing-md);
    transform: translateY(-50%);
    background: var(--bg-secondary);
    padding: 0 var(--spacing-xs);
    transition: all var(--transition-normal);
    pointer-events: none;
    color: var(--text-muted);
}

.form-group.floating input:focus + label,
.form-group.floating input:not(:placeholder-shown) + label {
    top: 0;
    transform: translateY(-50%);
    font-size: var(--font-size-xs);
    color: var(--primary-color);
    font-weight: 600;
}

/* Loading States */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    backdrop-filter: blur(5px);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--medium-gray);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Success State Animations */
.success-checkmark {
    display: inline-block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--success-color);
    position: relative;
    animation: checkmark-pop 0.3s ease-out;
}

.success-checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

@keyframes checkmark-pop {
    0% {
        transform: scale(0);
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
    }
}

/* Error State Animations */
.error-shake {
    animation: shake 0.5s ease-in-out;
}

/* Stagger Animation for Task Lists */
.task-list .task-item:nth-child(1) { animation-delay: 0s; }
.task-list .task-item:nth-child(2) { animation-delay: 0.1s; }
.task-list .task-item:nth-child(3) { animation-delay: 0.2s; }
.task-list .task-item:nth-child(4) { animation-delay: 0.3s; }
.task-list .task-item:nth-child(5) { animation-delay: 0.4s; }

/* Smooth Scrolling for Long Lists */
.task-list {
    scroll-behavior: smooth;
}

/* Enhanced Copy Button Interactions */
.copy-text-btn {
    position: relative;
    overflow: hidden;
}

.copy-text-btn.copied {
    background: var(--success-color) !important;
    animation: pulse 0.3s ease-out;
}

.copy-text-btn.copied::before {
    content: '✓ Copied!';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: inherit;
    animation: fadeInScale 0.3s ease-out;
}
/* 
===== ACCESSIBILITY STYLES ===== */

/* Focus Styles */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast focus for buttons */
.btn:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 1px var(--white), 0 0 0 4px var(--primary-color);
}

/* Task item focus styles */
.task-item:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    background-color: var(--bg-accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Message accessibility styles */
.message {
    position: relative;
    padding-right: 40px; /* Space for close button */
}

.message-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: transparent;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: inherit;
    opacity: 0.7;
    transition: opacity var(--transition-normal);
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
}

.message-close:hover {
    opacity: 1;
    background-color: rgba(0, 0, 0, 0.1);
}

.message-close:focus {
    outline: 2px solid currentColor;
    outline-offset: 1px;
    opacity: 1;
}

/* Manual post text accessibility */
.manual-post-text {
    border: 2px solid var(--info-color);
}

.manual-post-content {
    background: var(--bg-accent);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    font-family: monospace;
    white-space: pre-wrap;
    word-break: break-word;
    margin: var(--spacing-sm) 0;
    border: 1px solid var(--medium-gray);
}

.manual-post-content:focus {
    outline: 2px solid var(--info-color);
    outline-offset: 2px;
}

/* Skip link for screen readers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: var(--white);
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    z-index: 1000;
}

.skip-link:focus {
    top: 6px;
}

/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #0000ff;
        --success-color: #008000;
        --danger-color: #ff0000;
        --text-primary: #000000;
        --bg-primary: #ffffff;
        --bg-secondary: #ffffff;
    }
    
    .btn {
        border: 2px solid currentColor;
    }
    
    .task-item {
        border: 2px solid var(--text-primary);
    }
}

/* Screen reader only content */
.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;
}

/* Keyboard navigation indicators */
.task-item[tabindex]:focus-within {
    background-color: var(--bg-accent);
    border-color: var(--primary-color);
}

/* Error state accessibility */
.form-group input[aria-invalid="true"] {
    border-color: var(--danger-color);
    box-shadow: 0 0 0 2px rgba(220, 53, 69, 0.25);
}

/* Loading state accessibility */
.btn[aria-busy="true"] {
    position: relative;
}

.btn[aria-busy="true"]::after {
    content: "";
    position: absolute;
    width: 16px;
    height: 16px;
    margin: auto;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

/* Touch target size for mobile accessibility */
@media (max-width: 768px) {
    .btn {
        min-height: 44px;
        min-width: 44px;
    }
    
    .task-item .btn {
        padding: var(--spacing-md);
    }
}