/* Base Styles */
:root {
    --primary-color: #4a6bff;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-bg: #f8f9fa;
    --dark-bg: #343a40;
    --border-color: #dee2e6;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f7ff;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin-top: 70px;
    padding: 0 20px;
}

/* Header Styles */
.header {
    background: transparent;
    padding: 1rem 0;
    position: relative;
    z-index: 1000;
}

header:not(.header) {
    /* background: linear-gradient(135deg, #4a6bff, #6c5ce7); */
    color: white;
    padding: 2rem 0;
    text-align: center;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 3.5rem;
    margin-bottom: 0.5rem;
}

/* Tool Container */
.tool-container {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.input-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #495057;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 0.2rem rgba(74, 107, 255, 0.25);
}

/* Options Panel */
.options-panel {
    background-color: var(--light-bg);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.options-panel h3 {
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--dark-bg);
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--transition);
}

.btn i {
    margin-right: 0.5rem;
}

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

.btn-primary:hover {
    background-color: #3a5bd9;
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: 50%;
    background: var(--light-bg);
    color: var(--secondary-color);
}

.btn-icon:hover {
    background: #e2e6ea;
    color: var(--primary-color);
}

.action-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

/* Results */
.results {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background-color: var(--light-bg);
    border-bottom: 1px solid var(--border-color);
}

.output-box {
    min-height: 100px;
    padding: 1.5rem;
    font-family: 'Courier New', Courier, monospace;
    white-space: pre-wrap;
    word-break: break-all;
    line-height: 1.8;
    background: white;
}

.placeholder {
    color: #6c757d;
    font-style: italic;
    text-align: center;
    margin: 1.5rem 0;
}

.stats {
    display: flex;
    justify-content: space-around;
    padding: 1rem;
    background-color: var(--light-bg);
    border-top: 1px solid var(--border-color);
}

.stat {
    text-align: center;
}

.stat-label {
    display: block;
    font-size: 0.875rem;
    color: var(--secondary-color);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-weight: 600;
    color: var(--primary-color);
}

/* How to Use Section */
.how-to-use {
    background: white;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow);
}

.how-to-use h2 {
    color: var(--dark-bg);
    margin-bottom: 1rem;
}

.how-to-use ol {
    padding-left: 1.5rem;
}

.how-to-use li {
    margin-bottom: 0.5rem;
}

/* Footer */
footer {
    background-color: var(--dark-bg);
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 2rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .input-group, .options-grid {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
}

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

.fade-in {
    animation: fadeIn 0.3s ease-out forwards;
}