/*
 * Keyword Density Checker Pro – Scoped Styles
 * Prefix: kdc-
 * All selectors scoped under .kdc-tool
 */

/* ===== CSS Variables ===== */
.kdc-tool {
    --kdc-primary: #2563eb;        /* Blue 600 */
    --kdc-primary-dark: #1d4ed8;
    --kdc-surface: #ffffff;
    --kdc-bg: #f8fafc;
    --kdc-border: #e2e8f0;
    --kdc-text: #0f172a;
    --kdc-text-secondary: #475569;
    --kdc-success: #16a34a;
    --kdc-warning: #d97706;
    --kdc-danger: #dc2626;
    --kdc-radius: 12px;
    --kdc-radius-sm: 8px;
    --kdc-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --kdc-shadow-hover: 0 4px 12px rgba(0,0,0,0.08);
    --kdc-font: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --kdc-transition: 0.2s ease;
}

/* ===== General Reset Inside Tool ===== */
.kdc-tool,
.kdc-tool *,
.kdc-tool *::before,
.kdc-tool *::after {
    box-sizing: border-box;
}

.kdc-tool {
    font-family: var(--kdc-font);
    color: var(--kdc-text);
    background: var(--kdc-bg);
    padding: 24px;
    border-radius: var(--kdc-radius);
    max-width: 1200px;
    margin: 0 auto;
    line-height: 1.5;
}

/* ===== Sections ===== */
.kdc-section {
    margin-bottom: 32px;
}

.kdc-section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0 0 16px 0;
    color: var(--kdc-text);
}

/* ===== Hero ===== */
.kdc-hero {
    text-align: center;
    margin-bottom: 40px;
}

.kdc-hero-title {
    font-size: 2rem;
    font-weight: 700;
    margin: 0 0 8px 0;
    color: var(--kdc-primary);
}

.kdc-hero-description {
    font-size: 1.1rem;
    color: var(--kdc-text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* ===== Main Area (Input + Options) ===== */
.kdc-main-area {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 24px;
    margin-bottom: 32px;
}

@media (max-width: 768px) {
    .kdc-main-area {
        grid-template-columns: 1fr;
    }
}

/* ===== Input Section ===== */
.kdc-textarea {
    width: 100%;
    min-height: 240px;
    padding: 16px;
    font-size: 1rem;
    border: 2px solid var(--kdc-border);
    border-radius: var(--kdc-radius-sm);
    background: var(--kdc-surface);
    resize: vertical;
    font-family: inherit;
    transition: border-color var(--kdc-transition);
    outline: none;
}

.kdc-textarea:focus {
    border-color: var(--kdc-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.15);
}

.kdc-textarea-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
.kdc-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--kdc-radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--kdc-transition);
    background: var(--kdc-surface);
    color: var(--kdc-text);
    border-color: var(--kdc-border);
    white-space: nowrap;
}

.kdc-button:hover {
    background: #f1f5f9;
    box-shadow: var(--kdc-shadow-hover);
}

.kdc-button:focus-visible {
    outline: 2px solid var(--kdc-primary);
    outline-offset: 2px;
}

.kdc-button-primary {
    background: var(--kdc-primary);
    color: #fff;
    border-color: var(--kdc-primary);
}

.kdc-button-primary:hover {
    background: var(--kdc-primary-dark);
}

.kdc-button-outline {
    background: transparent;
    border-color: var(--kdc-border);
}

.kdc-button-outline:hover {
    background: #f8fafc;
}

.kdc-button-small {
    padding: 6px 14px;
    font-size: 0.85rem;
}

.kdc-button:disabled {
    opacity: 0.6;
    pointer-events: none;
}

/* ===== Options Section ===== */
.kdc-options-grid {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.kdc-option {
    display: flex;
    align-items: center;
    gap: 8px;
}

.kdc-option-label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--kdc-text-secondary);
    margin-bottom: 4px;
    display: block;
}

/* Toggle Switch */
.kdc-toggle-option {
    display: flex;
    align-items: center;
    gap: 12px;
}

.kdc-toggle-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 0.95rem;
    user-select: none;
}

.kdc-toggle-input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.kdc-toggle-slider {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    background: #cbd5e1;
    border-radius: 12px;
    transition: background var(--kdc-transition);
}

.kdc-toggle-slider::after {
    content: "";
    position: absolute;
    width: 20px;
    height: 20px;
    left: 2px;
    top: 2px;
    background: #fff;
    border-radius: 50%;
    transition: transform var(--kdc-transition);
}

.kdc-toggle-input:checked + .kdc-toggle-slider {
    background: var(--kdc-primary);
}

.kdc-toggle-input:checked + .kdc-toggle-slider::after {
    transform: translateX(20px);
}

.kdc-toggle-input:focus-visible + .kdc-toggle-slider {
    outline: 2px solid var(--kdc-primary);
    outline-offset: 2px;
}

/* Number Input */
.kdc-input {
    width: 80px;
    padding: 8px 12px;
    border: 1px solid var(--kdc-border);
    border-radius: var(--kdc-radius-sm);
    font-size: 0.9rem;
    background: var(--kdc-surface);
}

.kdc-input:focus {
    outline: 2px solid var(--kdc-primary);
    outline-offset: -1px;
}

/* Radio Group */
.kdc-phrase-length-group {
    border: none;
    padding: 0;
    margin: 0;
}

.kdc-radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.kdc-radio-label {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.9rem;
    cursor: pointer;
}

.kdc-radio-input:focus-visible + span {
    outline: 2px solid var(--kdc-primary);
}

/* Custom check row */
.kdc-custom-check {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--kdc-border);
}

.kdc-custom-input-row {
    display: flex;
    gap: 8px;
    margin-top: 6px;
}

.kdc-custom-input-row .kdc-input {
    flex: 1;
    max-width: none;
}

/* ===== Statistics Dashboard ===== */
.kdc-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
}

.kdc-stat-card {
    background: var(--kdc-surface);
    padding: 16px;
    border-radius: var(--kdc-radius);
    box-shadow: var(--kdc-shadow);
    text-align: center;
}

.kdc-stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--kdc-text-secondary);
    margin-bottom: 6px;
}

.kdc-stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--kdc-primary);
}

/* ===== Results Section ===== */
.kdc-results-toolbar {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.kdc-results-count {
    font-size: 0.9rem;
    color: var(--kdc-text-secondary);
}

.kdc-results-actions {
    display: flex;
    gap: 8px;
}

.kdc-table-wrapper {
    overflow-x: auto;
    border-radius: var(--kdc-radius);
    box-shadow: var(--kdc-shadow);
}

.kdc-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--kdc-surface);
    font-size: 0.9rem;
    min-width: 600px;
}

.kdc-table th {
    background: #f1f5f9;
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--kdc-text-secondary);
    white-space: nowrap;
}

.kdc-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--kdc-border);
    vertical-align: middle;
}

.kdc-table tr:last-child td {
    border-bottom: none;
}

.kdc-density-cell {
    display: flex;
    align-items: center;
    gap: 8px;
}

.kdc-progress-bar {
    flex: 1;
    height: 6px;
    background: #e2e8f0;
    border-radius: 3px;
    overflow: hidden;
}

.kdc-progress-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.3s;
}

.kdc-progress-low { background: #94a3b8; }
.kdc-progress-balanced { background: var(--kdc-success); }
.kdc-progress-high { background: var(--kdc-warning); }
.kdc-progress-overused { background: var(--kdc-danger); }

.kdc-status-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.kdc-status-low { background: #f1f5f9; color: #475569; }
.kdc-status-balanced { background: #dcfce7; color: #166534; }
.kdc-status-high { background: #fef3c7; color: #92400e; }
.kdc-status-overused { background: #fee2e2; color: #991b1b; }

/* Empty state */
.kdc-empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--kdc-text-secondary);
}

/* ===== Output actions ===== */
.kdc-output-actions {
    display: flex;
    gap: 12px;
    margin: 24px 0 32px;
    flex-wrap: wrap;
}

/* ===== Insights ===== */
.kdc-insights-grid {
    display: grid;
    gap: 12px;
}

.kdc-insight {
    padding: 14px 18px;
    border-radius: var(--kdc-radius-sm);
    font-size: 0.95rem;
    background: var(--kdc-surface);
    border-left: 4px solid transparent;
    box-shadow: var(--kdc-shadow);
}

.kdc-insight-good {
    border-color: var(--kdc-success);
    background: #f0fdf4;
}

.kdc-insight-warning {
    border-color: var(--kdc-warning);
    background: #fff7ed;
}

.kdc-insight-info {
    border-color: var(--kdc-primary);
    background: #eff6ff;
}

/* ===== FAQ ===== */
.kdc-faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.kdc-faq-item {
    background: var(--kdc-surface);
    border-radius: var(--kdc-radius-sm);
    box-shadow: var(--kdc-shadow);
}

.kdc-faq-question {
    padding: 16px 20px;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.kdc-faq-question::-webkit-details-marker {
    display: none;
}

.kdc-faq-question::after {
    content: '+';
    font-size: 1.3rem;
    color: var(--kdc-text-secondary);
    transition: transform 0.2s;
}

details[open] .kdc-faq-question::after {
    content: '−';
    transform: rotate(45deg);
}

.kdc-faq-answer {
    padding: 0 20px 16px;
    color: var(--kdc-text-secondary);
    margin: 0;
}

/* ===== Related Tools ===== */
.kdc-related-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.kdc-related-link {
    display: inline-block;
    padding: 8px 18px;
    background: var(--kdc-surface);
    border-radius: 100px;
    color: var(--kdc-primary);
    text-decoration: none;
    font-weight: 500;
    box-shadow: var(--kdc-shadow);
    transition: all var(--kdc-transition);
}

.kdc-related-link:hover {
    background: var(--kdc-primary);
    color: #fff;
    box-shadow: var(--kdc-shadow-hover);
}

/* ===== Custom Result Card ===== */
.kdc-custom-result {
    margin-top: 12px;
    padding: 16px;
    background: var(--kdc-surface);
    border-radius: var(--kdc-radius-sm);
    box-shadow: var(--kdc-shadow);
}

.kdc-custom-keyword-title {
    margin: 0 0 8px 0;
    font-size: 1rem;
    color: var(--kdc-text);
}

/* ===== Utility: Screen Reader Only ===== */
.kdc-sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0,0,0,0);
    white-space: nowrap;
    border: 0;
}

/* ===== Responsive Fine-tuning ===== */
@media (max-width: 600px) {
    .kdc-tool {
        padding: 16px;
    }
    .kdc-hero-title {
        font-size: 1.6rem;
    }
    .kdc-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .kdc-results-actions {
        width: 100%;
        margin-top: 8px;
        justify-content: flex-start;
    }
}