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

:root {
    --primary-color: #2c5f8d;
    --secondary-color: #4a7ba7;
    --accent-color: #d4af37;
    --bg-color: #f5f7fa;
    --text-color: #333;
    --border-color: #ddd;
    --success-color: #28a745;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-color);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.subtitle {
    font-size: 1rem;
    opacity: 0.9;
}

main {
    padding: 30px;
}

.input-section,
.output-section {
    margin-bottom: 30px;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--primary-color);
    font-size: 0.95rem;
}

.char-count {
    float: right;
    color: #666;
    font-weight: normal;
    font-size: 0.9rem;
}

input[type="text"],
textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input[type="text"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(44, 95, 141, 0.1);
}

textarea {
    min-height: 150px;
    resize: vertical;
}

.button-group {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.btn-primary,
.btn-secondary {
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    flex: 1;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(44, 95, 141, 0.3);
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.info-section {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    margin-top: 30px;
}

.info-section h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.info-section ul {
    list-style-position: inside;
    line-height: 1.8;
    color: #555;
}

.info-section li {
    margin-bottom: 8px;
}

footer {
    background: var(--bg-color);
    padding: 20px;
    text-align: center;
    color: #666;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .container {
        margin: 0;
        border-radius: 0;
    }

    header h1 {
        font-size: 1.5rem;
    }

    main {
        padding: 20px;
    }

    .button-group {
        flex-direction: column;
    }
}