/* Code Maintainability Index - mobile-first */

:root {
    --maint-text: #111827;
    --maint-text-muted: var(--text-muted, #6b7280);
    --maint-border: #e5e7eb;
    --maint-surface: #f9fafb;
    --maint-bg: #ffffff;
    --maint-ring-size: 120px;
    --maint-radius: 12px;
    --maint-radius-sm: 8px;
    --maint-success: #059669;
    --maint-warning: #d97706;
    --maint-danger: #dc2626;
    --maint-accent: #0d9488;
    --maint-accent-hover: #0f766e;
}

/* --- Tool interface --- */
.maint-wrap {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.maint-input {
    background: var(--maint-bg);
    border: 1px solid var(--maint-border);
    border-radius: var(--maint-radius);
    padding: 1.25rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.maint-label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--maint-text);
    margin-bottom: 0.5rem;
}

.maint-code {
    width: 100%;
    min-height: 220px;
    padding: 1rem;
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--maint-text);
    background: var(--maint-surface);
    border: 1px solid var(--maint-border);
    border-radius: var(--maint-radius-sm);
    resize: vertical;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.maint-code::placeholder {
    color: var(--maint-text-muted);
}

.maint-code:focus {
    outline: none;
    border-color: var(--maint-accent);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.maint-meta {
    margin-top: 0.5rem;
}

.maint-char-count {
    font-size: 0.8125rem;
    color: var(--maint-text-muted);
}

.maint-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1rem;
}

.maint-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--maint-radius-sm);
    border: none;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.maint-btn:active {
    transform: scale(0.98);
}

.maint-btn-primary {
    background: var(--maint-accent);
    color: #fff;
}

.maint-btn-primary:hover {
    background: var(--maint-accent-hover);
}

.maint-btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.maint-btn-secondary {
    background: var(--maint-surface);
    color: var(--maint-text);
    border: 1px solid var(--maint-border);
}

.maint-btn-secondary:hover {
    background: var(--maint-border);
}

.maint-btn-icon {
    font-size: 0.75rem;
    line-height: 1;
}

/* Results panel */
.maint-results {
    background: var(--maint-bg);
    border: 1px solid var(--maint-border);
    border-radius: var(--maint-radius);
    padding: 1.25rem;
    min-height: 200px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.maint-empty {
    text-align: center;
    padding: 2rem 1rem;
}

.maint-empty-icon {
    font-size: 2.5rem;
    color: var(--maint-text-muted);
    margin-bottom: 0.75rem;
    opacity: 0.7;
}

.maint-empty-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--maint-text);
    margin: 0 0 0.5rem 0;
}

.maint-empty-desc {
    font-size: 0.9375rem;
    color: var(--maint-text-muted);
    margin: 0;
    max-width: 320px;
    margin-left: auto;
    margin-right: auto;
}

.maint-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 2rem;
    font-size: 0.9375rem;
    color: var(--maint-text-muted);
}

.maint-loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--maint-border);
    border-top-color: var(--maint-accent);
    border-radius: 50%;
    animation: maint-spin 0.7s linear infinite;
}

@keyframes maint-spin {
    to { transform: rotate(360deg); }
}

.is-hidden {
    display: none !important;
}

/* Output block */
.maint-output {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.maint-index-row {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1.25rem;
}

.maint-index-ring {
    position: relative;
    width: var(--maint-ring-size);
    height: var(--maint-ring-size);
    flex-shrink: 0;
}

.maint-ring-svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.maint-ring-bg {
    stroke: var(--maint-border);
}

.maint-ring-fill {
    stroke: var(--maint-accent);
    stroke-linecap: round;
    transition: stroke-dashoffset 0.5s ease, stroke 0.3s ease;
}

.maint-index-value {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--maint-text);
    line-height: 1;
}

.maint-index-meta {
    flex: 1;
    min-width: 0;
}

.maint-index-label {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--maint-text);
    margin: 0 0 0.25rem 0;
}

.maint-index-desc {
    font-size: 0.875rem;
    color: var(--maint-text-muted);
    margin: 0;
}

.maint-bar-wrap {
    height: 10px;
    background: var(--maint-surface);
    border-radius: 5px;
    overflow: hidden;
}

.maint-bar {
    height: 100%;
    border-radius: 5px;
    transition: width 0.5s ease, background-color 0.3s ease;
}

.maint-bar.high {
    background: var(--maint-success);
}

.maint-bar.medium {
    background: var(--maint-warning);
}

.maint-bar.low {
    background: var(--maint-danger);
}

.maint-metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.maint-metric {
    background: var(--maint-surface);
    border: 1px solid var(--maint-border);
    border-radius: var(--maint-radius-sm);
    padding: 0.75rem 1rem;
}

.maint-metric-name {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--maint-text-muted);
    margin-bottom: 0.25rem;
}

.maint-metric-value {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--maint-text);
}

.maint-recommendation {
    font-size: 0.9375rem;
    padding: 1rem 1.25rem;
    border-radius: var(--maint-radius-sm);
    border-left: 4px solid var(--maint-accent);
    background: var(--maint-surface);
    color: var(--maint-text);
}

.maint-recommendation strong {
    display: block;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--maint-text-muted);
    margin-bottom: 0.25rem;
}

/* Tier colors for ring and value */
.maint-tier-high .maint-ring-fill { stroke: var(--maint-success); }
.maint-tier-high .maint-index-value { color: var(--maint-success); }
.maint-tier-medium .maint-ring-fill { stroke: var(--maint-warning); }
.maint-tier-medium .maint-index-value { color: var(--maint-warning); }
.maint-tier-low .maint-ring-fill { stroke: var(--maint-danger); }
.maint-tier-low .maint-index-value { color: var(--maint-danger); }

/* Tablet and up: optional side-by-side layout */
@media (min-width: 768px) {
    .maint-wrap {
        gap: 1.75rem;
    }

    .maint-input {
        padding: 1.5rem;
    }

    .maint-results {
        padding: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .maint-wrap {
        display: grid;
        grid-template-columns: 1fr 1fr;
        align-items: start;
        gap: 2rem;
    }

    .maint-results {
        min-height: 340px;
    }
}