:root {
    --md5-primary-grad: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    --md5-danger-grad: linear-gradient(135deg, #ef4444 0%, #b91c1c 100%);
    --md5-success-bg: #d1fae5;
    --md5-success-text: #065f46;
    --md5-success-border: #10b981;
    --md5-danger-bg: #fee2e2;
    --md5-danger-text: #991b1b;
    --md5-danger-border: #f87171;
    --md5-bg-main: #ffffff;
    --md5-bg-card: #f9fafb;
    --md5-border: #e5e7eb;
    --md5-text: #1f2937;
    --md5-text-muted: #4b5563;
}

/* Auto Dark Mode Preference Integration Support */
@media (prefers-color-scheme: dark) {
    :root {
        --md5-bg-main: #111827;
        --md5-bg-card: #1f2937;
        --md5-border: #374151;
        --md5-text: #f9fafb;
        --md5-text-muted: #9ca3af;
        --md5-success-bg: #064e3b;
        --md5-success-text: #6ee7b7;
        --md5-danger-bg: #7f1d1d;
        --md5-danger-text: #fca5a5;
    }
}

.md5-container {
    background: var(--md5-bg-main);
    border: 1px solid var(--md5-border);
    border-radius: 12px;
    padding: 25px;
    max-width: 900px;
    margin: 20px auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--md5-text);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    position: relative;
}

.md5-header {
    text-align: center;
    margin-bottom: 25px;
}

.md5-header h2 {
    margin: 0 0 8px 0;
    color: var(--md5-text);
    font-size: 24px;
    font-weight: 700;
}

.md5-header p {
    margin: 0;
    color: var(--md5-text-muted);
    font-size: 14px;
}

/* Tabs UI Navigation layout styling */
.md5-tabs {
    display: flex;
    border-bottom: 2px solid var(--md5-border);
    margin-bottom: 20px;
    gap: 5px;
}

.md5-tab-btn {
    background: transparent;
    border: none;
    outline: none;
    padding: 10px 20px;
    font-size: 15px;
    font-weight: 600;
    color: var(--md5-text-muted);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    transition: all 0.3s ease;
}

.md5-tab-btn:hover {
    color: var(--md5-text);
}

.md5-tab-btn.active {
    color: #4f46e5;
    border-bottom: 2px solid #4f46e5;
}

.md5-tab-content {
    display: none;
    animation: fadeIn 0.4s ease;
}

.md5-tab-content.active {
    display: block;
}

/* Standard Inputs and controls layout sets */
.md5-control-group {
    margin-bottom: 20px;
}

.md5-control-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--md5-text);
}

.md5-action-bar {
    display: flex;
    gap: 10px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}

.md5-container textarea,
.md5-container input[type="text"] {
    width: 100%;
    background: var(--md5-bg-card);
    border: 1px solid var(--md5-border);
    color: var(--md5-text);
    border-radius: 8px;
    padding: 12px;
    font-size: 15px;
    font-family: monospace;
    box-sizing: border-box;
    transition: border-color 0.2s ease;
}

.md5-container textarea:focus,
.md5-container input[type="text"]:focus {
    border-color: #7c3aed;
    outline: none;
}

.md5-options-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 20px;
}

/* Custom Checkboxes UI */
.md5-checkbox-container {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    color: var(--md5-text-muted);
    user-select: none;
}

/* Interactive Gradient Buttons */
.md5-btn-primary {
    background: var(--md5-primary-grad);
    color: white !important;
    border: none;
    padding: 10px 22px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.md5-btn-secondary {
    background: var(--md5-bg-card);
    color: var(--md5-text) !important;
    border: 1px solid var(--md5-border);
    padding: 6px 14px;
    font-size: 13px;
    font-weight: 500;
    border-radius: 6px;
    cursor: pointer;
}

.md5-btn-danger {
    background: var(--md5-danger-grad);
    color: white !important;
    border: none;
    padding: 10px 22px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
}

.md5-btn-primary:hover, .md5-btn-danger:hover, .md5-btn-secondary:hover {
    opacity: 0.9;
}

/* Output Design & Analysis Cards layout specs */
.md5-results-card {
    background: var(--md5-bg-card);
    border: 1px solid var(--md5-border);
    border-radius: 10px;
    padding: 20px;
    margin-top: 20px;
}

.md5-results-card h3 {
    margin: 0 0 15px 0;
    font-size: 16px;
    font-weight: 600;
}

.md5-output-box {
    margin-bottom: 20px;
}

.md5-output-title {
    display: block;
    font-size: 13px;
    color: var(--md5-text-muted);
    margin-bottom: 5px;
}

.md5-copy-row {
    display: flex;
    gap: 8px;
}

.md5-copy-row input {
    flex-grow: 1;
    font-weight: bold;
    letter-spacing: 0.5px;
}

.btn-copy, .btn-export {
    background: #4f46e5;
    color: white;
    border: none;
    padding: 0 15px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    height: 42px;
}

.btn-export {
    background: #4b5563;
    height: 36px;
}

.md5-export-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

/* Statistics Dynamic Flex Cards Grid */
.md5-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-top: 15px;
}

.md5-stat-card {
    background: var(--md5-bg-main);
    border: 1px solid var(--md5-border);
    padding: 12px;
    border-radius: 8px;
    text-align: center;
}

.md5-stat-card .stat-title {
    display: block;
    font-size: 11px;
    color: var(--md5-text-muted);
    text-transform: uppercase;
    margin-bottom: 4px;
}

.md5-stat-card .stat-value {
    font-size: 15px;
    font-weight: 700;
    color: var(--md5-text);
}

/* Alerts Validation Block Definitions Layout styling */
.md5-alert-error {
    background-color: var(--md5-danger-bg);
    color: var(--md5-danger-text);
    padding: 12px;
    border-radius: 6px;
    margin: 15px 0;
    font-size: 14px;
    border: 1px solid var(--md5-danger-border);
}

.md5-verification-alert {
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    font-size: 16px;
    font-weight: bold;
    margin-top: 20px;
    border: 1px solid transparent;
}

.md5-verification-alert.match {
    background-color: var(--md5-success-bg);
    color: var(--md5-success-text);
    border-color: var(--md5-success-border);
}

.md5-verification-alert.mismatch {
    background-color: var(--md5-danger-bg);
    color: var(--md5-danger-text);
    border-color: var(--md5-danger-border);
}

/* Loading Spinner Overlays Styling CSS animation logic definitions */
.md5-loading-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(255,255,255,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    border-radius: 12px;
}

@media (prefers-color-scheme: dark) {
    .md5-loading-overlay { background: rgba(17,24,39,0.7); }
}

.md5-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--md5-border);
    border-top: 4px solid #7c3aed;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.md5-branding {
    text-align: center;
    margin-top: 25px;
    font-size: 11px;
    color: var(--md5-text-muted);
    border-top: 1px solid var(--md5-border);
    padding-top: 15px;
}
.md5-branding a {
    color: #4f46e5;
    text-decoration: none;
}

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
@keyframes fadeIn { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }

/* Responsive adjustments rulesets layout */
@media (max-width: 640px) {
    .md5-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .md5-tabs { flex-direction: column; border-bottom: none; }
    .md5-tab-btn { border-bottom: none !important; border-left: 3px solid transparent; text-align: left; }
    .md5-tab-btn.active { border-left-color: #4f46e5; }
}