/* ============================================================
   prompt-builder.css — AI Prompt Builder page
   ============================================================ */

/* ── Page header ── */
.builder-header {
    padding: var(--space-10) 0 var(--space-8);
    text-align: center;
    border-bottom: 1px solid var(--border);
    margin-bottom: var(--space-8);
}

.builder-header h1 {
    font-family: var(--font-display);
    font-size: clamp(var(--text-3xl), 4vw, var(--text-4xl));
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-3);
}

.builder-header p {
    color: var(--text-muted);
    font-size: var(--text-base);
    max-width: 560px;
    margin: 0 auto;
}

/* ── Prompt type tabs ── */
.builder-type-tabs {
    display: flex;
    gap: 4px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 4px;
    width: fit-content;
    margin: 0 0 var(--space-6);
}

.builder-type-tab {
    padding: 7px 20px;
    border-radius: 7px;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--text-muted);
    background: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
}

.builder-type-tab:hover { color: var(--text); background: var(--surface-2); }
.builder-type-tab.active { background: var(--surface-3); color: var(--text); }

.coming-soon-badge {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-faint);
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    padding: 1px 6px;
}

/* ── Two-column builder layout ── */
.builder-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    align-items: start;
    padding-bottom: var(--space-24);
}

/* ── Form column ── */
.builder-form-col {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.builder-form-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

/* ── Starter chips ── */
.starter-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: var(--space-2);
}

.starter-chip {
    padding: 4px 12px;
    border-radius: var(--radius-pill);
    font-size: var(--text-xs);
    color: var(--text-muted);
    background: var(--surface-2);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.starter-chip:hover {
    color: var(--accent-orange);
    border-color: rgba(255, 92, 53, 0.3);
    background: rgba(255, 92, 53, 0.06);
}

/* ── Length radio group ── */
.length-group {
    display: flex;
    gap: 6px;
}

.length-radio {
    flex: 1;
    position: relative;
}

.length-radio input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.length-radio label {
    display: block;
    text-align: center;
    padding: 8px 12px;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-muted);
    background: var(--surface-2);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.length-radio input[type="radio"]:checked + label {
    color: var(--text);
    border-color: var(--accent-orange);
    background: rgba(255, 92, 53, 0.08);
}

.length-radio label:hover { color: var(--text); border-color: var(--border-hover); }

/* ── Examples toggle ── */
.examples-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
}

.examples-toggle input[type="checkbox"] {
    display: none;
}

.toggle-track {
    width: 38px;
    height: 22px;
    border-radius: var(--radius-pill);
    background: var(--surface-3);
    border: 1px solid var(--border);
    position: relative;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.toggle-track::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--text-faint);
    transition: all var(--transition-fast);
}

.examples-toggle input[type="checkbox"]:checked ~ .toggle-track {
    background: rgba(255, 92, 53, 0.2);
    border-color: rgba(255, 92, 53, 0.4);
}

.examples-toggle input[type="checkbox"]:checked ~ .toggle-track::after {
    left: 19px;
    background: var(--accent-orange);
}

.toggle-label {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

.toggle-label strong {
    color: var(--text);
    font-weight: 600;
}

/* ── Clear all link ── */
.builder-clear {
    font-size: var(--text-xs);
    color: var(--text-faint);
    cursor: pointer;
    text-decoration: none;
    text-align: right;
    display: block;
    padding-top: var(--space-2);
    transition: color var(--transition-fast);
}
.builder-clear:hover { color: var(--text-muted); }

/* ── Preview column ── */
.builder-preview-col {
    position: sticky;
    top: calc(var(--nav-height) + var(--space-6));
}

.builder-preview-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.builder-preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--border);
    background: var(--surface-2);
}

.builder-preview-label {
    font-size: var(--text-xs);
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.builder-preview-meta {
    font-size: var(--text-xs);
    color: var(--text-faint);
}

.builder-preview-body {
    padding: var(--space-5);
    min-height: 200px;
    font-size: var(--text-sm);
    line-height: 1.7;
    color: var(--text-muted);
    white-space: pre-wrap;
    word-break: break-word;
}

.builder-preview-body.has-content {
    color: var(--text);
}

.builder-preview-empty {
    color: var(--text-faint);
    font-style: italic;
}

/* ── Skeleton shimmer (AI loading) ── */
.skeleton-lines {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: var(--space-5);
}

.skeleton-line {
    height: 14px;
    border-radius: var(--radius-sm);
    background: linear-gradient(90deg, var(--surface-2) 25%, var(--surface-3) 50%, var(--surface-2) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.4s infinite;
}

.skeleton-line:nth-child(2) { width: 88%; }
.skeleton-line:nth-child(3) { width: 92%; }
.skeleton-line:nth-child(4) { width: 75%; }
.skeleton-line:nth-child(5) { width: 83%; }

@keyframes shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ── Preview actions ── */
.builder-preview-actions {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.builder-actions-row {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.builder-enhance-wrap {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.builder-enhance-info {
    font-size: var(--text-xs);
    color: var(--text-faint);
}

/* ── AI error / limit messages ── */
.builder-ai-message {
    font-size: var(--text-xs);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    display: none;
}

.builder-ai-message.error {
    background: rgba(255, 92, 53, 0.08);
    border: 1px solid rgba(255, 92, 53, 0.2);
    color: var(--accent-orange);
}

.builder-ai-message.limit {
    background: rgba(168, 85, 247, 0.08);
    border: 1px solid rgba(168, 85, 247, 0.2);
    color: var(--accent-purple);
}

.builder-ai-message a {
    color: inherit;
    font-weight: 600;
}

/* ── Copy confirmation ── */
.copy-confirm {
    display: none;
    font-size: var(--text-xs);
    color: var(--accent-green);
}

/* ── Save modal ── */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 200;
    align-items: center;
    justify-content: center;
    padding: var(--space-5);
}

.modal-overlay.open {
    display: flex;
}

.modal-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-6);
    width: 100%;
    max-width: 480px;
    position: relative;
}

.modal-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-5);
}

.modal-close {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    background: none;
    border: none;
    color: var(--text-faint);
    font-size: var(--text-xl);
    cursor: pointer;
    line-height: 1;
    transition: color var(--transition-fast);
}
.modal-close:hover { color: var(--text-muted); }

.modal-actions {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-5);
}

.modal-success {
    display: none;
    text-align: center;
    padding: var(--space-6) 0 var(--space-2);
}

.modal-success-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-3);
}

.modal-success-msg {
    font-size: var(--text-base);
    color: var(--text-muted);
    margin-bottom: var(--space-4);
}

/* ── Responsive ── */
@media (max-width: 860px) {
    .builder-layout {
        grid-template-columns: 1fr;
    }

    .builder-preview-col {
        position: static;
        order: -1;
    }
}

@media (max-width: 600px) {
    .builder-type-tabs {
        width: 100%;
    }

    .builder-type-tab {
        flex: 1;
        justify-content: center;
        padding: 7px 10px;
        font-size: 0.75rem;
    }

    .builder-actions-row {
        flex-direction: column;
    }

    .builder-actions-row .btn {
        width: 100%;
        text-align: center;
    }
}