/* CSS Custom Properties for Consistent Design */
:root {
    /* Color Palette - Soft, Calming Colors */
    --primary-bg: #d9e7f5;
    --secondary-bg: #ebeef1;
    --card-bg: #ffffff;
    --border-color: #e1e5e9;
    --text-primary: #2c3e50;
    --text-secondary: #5a6c7d;
    --text-muted: #8b9dc3;
    --accent-blue: #6c9bd1;
    --accent-green: #7fb069;
    --accent-soft: #b8d4f0;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --error-color: #e74c3c;
    --shadow-light: rgba(0, 0, 0, 0.05);
    --shadow-medium: rgba(0, 0, 0, 0.1);
    --shadow-strong: rgba(0, 0, 0, 0.15);
    
    /* Typography */
    --font-primary: 'Lexend Deca', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-dyslexia: 'OpenDyslexic', 'Lexend Deca', sans-serif;
    --font-size-base: 16px;
    --font-size-large: 18px;
    --font-size-small: 14px;
    --line-height-base: 1.6;
    --line-height-relaxed: 1.8;
    
    /* 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: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--primary-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Focus Styles for Accessibility */
*:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

*:focus:not(:focus-visible) {
    outline: none;
}

/* Navigation */
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 8px var(--shadow-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-brand i {
    color: var(--accent-blue);
    font-size: 1.5rem;
}

.nav-brand h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.info-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.info-btn:hover {
    color: var(--accent-blue);
    background-color: var(--accent-soft);
}

/* Info Tooltip */
.info-tooltip {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 30px var(--shadow-strong);
    padding: var(--spacing-xl);
    max-width: 500px;
    width: 90%;
    z-index: 1000;
    transition: transform var(--transition-normal);
}

.info-tooltip.show {
    transform: translate(-50%, -50%) scale(1);
}

.tooltip-content h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.25rem;
}

.tooltip-content p {
    color: var(--text-secondary);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-lg);
}

.close-tooltip {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast);
}

.close-tooltip:hover {
    color: var(--text-primary);
}

/* Main Content */
.main-content {
    min-height: calc(100vh - 140px);
    padding: var(--spacing-xl) 0;
}

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

/* App Header */
.app-header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.app-header h2 {
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.subtitle {
    font-size: var(--font-size-large);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: var(--line-height-relaxed);
}

/* Controls Section */
.controls-section {
    margin-bottom: var(--spacing-xl);
}

.control-group {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.control-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 4px var(--shadow-light);
}

.control-btn:hover {
    border-color: var(--accent-blue);
    background-color: var(--accent-soft);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px var(--shadow-medium);
}

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

.control-btn[aria-pressed="true"] {
    background-color: var(--accent-blue);
    border-color: var(--accent-blue);
    color: white;
}

.tts-controls {
    display: flex;
    gap: var(--spacing-sm);
}

/* Text Section */
.text-section {
    margin-bottom: var(--spacing-xl);
}

.text-container {
    display: grid;
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.text-box-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.text-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-large);
}

.text-label i {
    color: var(--accent-blue);
}

.text-box-wrapper {
    position: relative;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 12px var(--shadow-light);
    transition: all var(--transition-fast);
}

.text-box-wrapper:focus-within {
    border-color: var(--accent-blue);
    box-shadow: 0 4px 20px var(--shadow-medium);
}

.text-box {
    width: 100%;
    padding: var(--spacing-lg);
    border: none;
    background: transparent;
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--text-primary);
    resize: vertical;
    min-height: 200px;
    border-radius: var(--radius-lg);
}

.text-box:focus {
    outline: none;
}

.text-box::placeholder {
    color: var(--text-muted);
    font-style: italic;
}

.text-box-actions {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    display: flex;
    gap: var(--spacing-xs);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.text-box-wrapper:hover .text-box-actions {
    opacity: 1;
}

.action-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    padding: var(--spacing-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 4px var(--shadow-light);
}

.action-btn:hover {
    background: var(--accent-soft);
    color: var(--accent-blue);
    transform: translateY(-1px);
}

/* Process Section */
.process-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.process-btn {
    position: relative;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-green));
    border: none;
    border-radius: var(--radius-xl);
    color: white;
    font-family: var(--font-primary);
    font-size: var(--font-size-large);
    font-weight: 600;
    padding: var(--spacing-lg) var(--spacing-xxl);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 6px 20px var(--shadow-medium);
    overflow: hidden;
}

.process-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px var(--shadow-strong);
}

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

.process-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-text {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.loading-spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.process-btn.loading .btn-text {
    opacity: 0;
}

.process-btn.loading .loading-spinner {
    opacity: 1;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top: 3px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Help Text */
.help-text {
    font-size: var(--font-size-small);
    color: var(--text-muted);
    font-style: italic;
}

/* Status Messages */
.status-messages {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    z-index: 1000;
}

.status-message {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    box-shadow: 0 4px 12px var(--shadow-medium);
    margin-bottom: var(--spacing-sm);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    max-width: 300px;
}

.status-message.show {
    transform: translateX(0);
}

.status-message.success {
    border-left: 4px solid var(--success-color);
}

.status-message.error {
    border-left: 4px solid var(--error-color);
}

.status-message.warning {
    border-left: 4px solid var(--warning-color);
}

/* Footer */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0;
    text-align: center;
    margin-top: var(--spacing-xxl);
}

.footer-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.heart {
    color: var(--error-color);
    animation: heartbeat 2s ease-in-out infinite;
}

@keyframes heartbeat {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.footer-subtitle {
    font-size: var(--font-size-small);
    color: var(--text-muted);
}

/* Dyslexia-Friendly Styles */
.dyslexia-friendly {
    font-family: var(--font-dyslexia) !important;
    letter-spacing: 0.1em !important;
    word-spacing: 0.2em !important;
    line-height: 1.8 !important;
}

.dyslexia-friendly .text-box {
    font-family: var(--font-dyslexia) !important;
    font-weight: 500 !important;
    letter-spacing: 0.12em !important;
    word-spacing: 0.25em !important;
    line-height: 1.9 !important;
    font-size: 1.1em !important;
    color: var(--text-primary) !important;
    background-color: #fefefe !important;
    border: 2px solid var(--accent-blue) !important;
}

.dyslexia-friendly .text-box::first-letter {
    font-weight: 700 !important;
    font-size: 1.2em !important;
}

.dyslexia-friendly .text-box::placeholder {
    font-family: var(--font-dyslexia) !important;
    letter-spacing: 0.1em !important;
    word-spacing: 0.2em !important;
}

/* Enhanced dyslexia-friendly text styling */
.dyslexia-friendly .text-box {
    text-shadow: 0.5px 0.5px 0px rgba(0, 0, 0, 0.1) !important;
    text-rendering: optimizeLegibility !important;
    -webkit-font-smoothing: antialiased !important;
    -moz-osx-font-smoothing: grayscale !important;
}

/* Apply dyslexia-friendly styles to all text elements */
.dyslexia-friendly .text-label,
.dyslexia-friendly .help-text,
.dyslexia-friendly .status-message,
.dyslexia-friendly h1,
.dyslexia-friendly h2,
.dyslexia-friendly h3,
.dyslexia-friendly p {
    font-family: var(--font-dyslexia) !important;
    letter-spacing: 0.08em !important;
    word-spacing: 0.15em !important;
    line-height: 1.7 !important;
}

/* Dyslexia-friendly button text */
.dyslexia-friendly .control-btn span,
.dyslexia-friendly .process-btn .btn-text {
    font-family: var(--font-dyslexia) !important;
    letter-spacing: 0.05em !important;
    word-spacing: 0.1em !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .nav-container {
        padding: var(--spacing-md);
    }
    
    .nav-brand h1 {
        font-size: 1.25rem;
    }
    
    .app-header h2 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: var(--font-size-base);
    }
    
    .control-group {
        flex-direction: column;
        align-items: center;
    }
    
    .tts-controls {
        width: 100%;
        justify-content: center;
    }
    
    .text-box {
        min-height: 150px;
        font-size: var(--font-size-large);
    }
    
    .process-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .status-messages {
        top: var(--spacing-md);
        right: var(--spacing-md);
        left: var(--spacing-md);
    }
    
    .status-message {
        max-width: none;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: var(--spacing-lg) 0;
    }
    
    .app-header {
        margin-bottom: var(--spacing-xl);
    }
    
    .app-header h2 {
        font-size: 1.75rem;
    }
    
    .text-box {
        padding: var(--spacing-md);
        font-size: var(--font-size-large);
    }
    
    .text-box-actions {
        position: static;
        opacity: 1;
        margin-top: var(--spacing-sm);
        justify-content: center;
    }
    
    .info-tooltip {
        width: 95%;
        padding: var(--spacing-lg);
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-primary: #000000;
        --text-secondary: #333333;
        --shadow-light: rgba(0, 0, 0, 0.2);
        --shadow-medium: rgba(0, 0, 0, 0.3);
    }
}

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

/* Print Styles */
@media print {
    .navbar,
    .controls-section,
    .text-box-actions,
    .process-section,
    .footer {
        display: none;
    }
    
    .text-box {
        border: 1px solid #000;
        box-shadow: none;
    }
}