/* Base styles and variables */
:root {
    --primary-bg: #ffffff;
    --secondary-bg: #f8f9fa;
    --text-color: #333333;
    --accent-color: #4ecca3;
    --accent-hover: #3da58a;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --metric-card-bg: #ffffff;
    --toolbar-bg: #f1f4f8;
    --error-bg: #ffebee;
    --success-bg: #e8f5e9;
    --warning-bg: #fff3e0;
}

/* Dark mode variables */
.dark-mode {
    --primary-bg: #121212;
    --secondary-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --accent-color: #4ecca3;
    --accent-hover: #3da58a;
    --border-color: #444444;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --metric-card-bg: #1e1e1e;
    --toolbar-bg: #252525;
    --error-bg: #371d22;
    --success-bg: #1b3022;
    --warning-bg: #332a15;
}

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

body {
    font-family: 'Roboto', 'Inter', sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header styles */
header {
    background-color: var(--toolbar-bg);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    text-align: center;
    padding: 20px 0;
    color: var(--accent-color);
    font-size: 2.5rem;
}

.toolbar {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    padding-bottom: 15px;
}

.toolbar-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s;
}

.toolbar-btn:hover {
    background-color: var(--accent-hover);
}

/* Welcome note */
.welcome-note {
    text-align: center;
    margin: 30px 0;
    font-size: 1.1rem;
    color: var(--text-color);
}

/* Input section */
.input-section {
    margin: 20px 0;
}

#textInput {
    width: 100%;
    min-height: 300px;
    padding: 20px;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    resize: vertical;
    background-color: var(--secondary-bg);
    color: var(--text-color);
    transition: box-shadow 0.3s;
}

#textInput:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--accent-color);
}

/* Metrics section */
.metrics-section {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 20px;
    margin: 30px 0;
}

.metric-card {
    background-color: var(--metric-card-bg);
    border-radius: 8px;
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow);
    min-width: 150px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.metric-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.metric-label {
    display: block;
    font-size: 1rem;
    margin-bottom: 10px;
    color: var(--text-color);
}

.metric-value {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: var(--accent-color);
}

/* Progress bar */
.progress-bar {
    height: 4px;
    background-color: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
    margin: 20px 0;
    display: none;
}

.progress-fill {
    height: 100%;
    background-color: var(--accent-color);
    width: 0%;
    transition: width 0.3s;
}

/* Controls */
.controls {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 15px;
    margin: 30px 0;
}

.control-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: background-color 0.3s;
}

.control-btn:hover {
    background-color: var(--accent-hover);
}

/* Download options */
.download-options {
    display: none;
    text-align: center;
    margin: 20px 0;
    padding: 20px;
    background-color: var(--secondary-bg);
    border-radius: 8px;
}

.download-options h3 {
    margin-bottom: 15px;
    color: var(--text-color);
}

.format-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 10px 20px;
    margin: 0 10px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.format-btn:hover {
    background-color: var(--accent-hover);
}

/* Message area */
.message-area {
    margin: 20px 0;
    padding: 15px;
    border-radius: 4px;
    text-align: center;
    display: none;
}

.message-area.success {
    background-color: var(--success-bg);
    color: #4caf50;
    display: block;
}

.message-area.error {
    background-color: var(--error-bg);
    color: #f44336;
    display: block;
}

.message-area.warning {
    background-color: var(--warning-bg);
    color: #ff9800;
    display: block;
}

/* Animations */
@keyframes glow {
    0% { box-shadow: 0 0 5px var(--accent-color); }
    50% { box-shadow: 0 0 20px var(--accent-color); }
    100% { box-shadow: 0 0 5px var(--accent-color); }
}

.glow {
    animation: glow 1s ease-in-out;
}

/* Responsive design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .toolbar {
        flex-direction: column;
        align-items: center;
    }
    
    .toolbar-btn {
        width: 80%;
        margin-bottom: 5px;
    }
    
    .metrics-section {
        flex-direction: column;
        align-items: center;
    }
    
    .metric-card {
        width: 80%;
    }
    
    .controls {
        flex-direction: column;
        align-items: center;
    }
    
    .control-btn {
        width: 80%;
        margin-bottom: 10px;
    }
    
    .format-btn {
        display: block;
        width: 80%;
        margin: 10px auto;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }
    
    header h1 {
        font-size: 1.5rem;
    }
    
    .welcome-note {
        font-size: 1rem;
    }
    
    #textInput {
        min-height: 200px;
        padding: 15px;
    }
    
    .metric-value {
        font-size: 1.5rem;
    }
}