:root {
    --bg-color: #f0f4f8;
    --card-bg: #ffffff;
    --text-color: #333;
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --error-color: #dc3545;
    --border-color: #dee2e6;
    --font-sans: 'Poppins', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 2rem 1rem;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1.2rem;
    color: var(--secondary-color);
}

.card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
}

.card h2 {
    margin-top: 0;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.card h3 {
    margin-top: 1.5rem;
    font-weight: 600;
    color: var(--secondary-color);
}

textarea {
    width: 100%;
    padding: 0.75rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 1rem;
    resize: vertical;
    box-sizing: border-box;
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

.key-controls {
    margin-bottom: 1rem;
    display: flex;
    gap: 1rem;
}

#key-mapping-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    padding: 1rem 0;
}

.key-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    font-family: var(--font-mono);
}

.key-item .original-char {
    font-weight: bold;
    font-size: 1rem;
    color: var(--secondary-color);
}

.key-item input {
    width: 30px;
    height: 30px;
    text-align: center;
    font-size: 1.2rem;
    font-weight: bold;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    text-transform: lowercase;
    font-family: var(--font-mono);
    padding: 0;
}

.key-item input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.error-message {
    color: var(--error-color);
    font-weight: bold;
    text-align: center;
    min-height: 1.2em;
    margin-top: 1rem;
}

.navigation {
    text-align: center;
    margin-top: 1rem;
}

.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

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

.btn-disabled {
    background-color: var(--secondary-color);
    cursor: not-allowed;
    pointer-events: none;
    opacity: 0.7;
}

#randomize-key-btn, #clear-key-btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* Break Page Specifics */
.hidden {
    display: none;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    text-align: center;
    margin-bottom: 2rem;
}

.stats-grid .label {
    display: block;
    font-size: 0.9rem;
    color: var(--secondary-color);
    font-weight: 600;
}

.stats-grid .value {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
}

#live-key-mapping {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 12px;
    font-family: var(--font-mono);
    background: #f9f9f9;
    padding: 1rem;
    border-radius: 6px;
    justify-content: center;
}

.live-key-pair {
    display: inline-flex;
    align-items: center;
    transition: all 0.3s ease;
    padding: 2px 4px;
    border-radius: 3px;
}

.live-key-pair .arrow {
    margin: 0 4px;
    color: var(--secondary-color);
}

.live-key-pair.highlight {
    background-color: #fff3cd; /* A light yellow for highlight */
    transform: scale(1.1);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.plaintext-display {
    background: #2d2d2d;
    color: #f0f0f0;
    padding: 1rem;
    border-radius: 6px;
    font-family: var(--font-mono);
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 400px;
    overflow-y: auto;
}

.card.success {
    border-color: var(--success-color);
}

.card.success h2 {
    color: var(--success-color);
    border-bottom-color: var(--success-color);
}

.final-stats .value {
    color: var(--success-color);
}

.final-key {
    font-family: var(--font-mono);
    background: #e9ecef;
    padding: 0.5rem;
    border-radius: 4px;
    word-break: break-all;
    text-align: center;
}

.chart-container {
    position: relative;
    height: 400px; /* Or any desired height */
    width: 100%;
}

/* ADDED: Styles for the final key mapping display */
.final-key-mapping {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    background: #f0f4f8; /* Use the main bg color for contrast */
    padding: 1rem;
    border-radius: 6px;
    font-family: var(--font-mono);
}

.key-map-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: white;
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.key-map-cipher {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-color);
}

.key-map-plain {
    font-size: 0.9rem;
    color: var(--secondary-color);
    border-top: 1px solid var(--border-color);
    margin-top: 2px;
    padding-top: 2px;
}