/* ============================================================
   CSS Flexbox Generator — flexbox-generator.css
   Prefix: .fbg-*  |  Brand: #3B82F6
   ============================================================ */

/* ── Tokens ─────────────────────────────────────────────── */
.fbg-section {
    --fbg-accent: #3B82F6;
    --fbg-accent-dark: #2563EB;
    --fbg-border: rgba(15, 23, 42, 0.09);
    --fbg-text: #0F172A;
    --fbg-muted: #475569;
    --fbg-label: #1E293B;
    --fbg-input-bg: #FFFFFF;
    --fbg-input-border: #C9D6E3;
    --fbg-stage-bg: #F1F5F9;
    --fbg-code-bg: #F1F5F9;
    --fbg-radius-base: 20px;
    --fbg-radius-sm: 10px;
}

/* ── Section ─────────────────────────────────────────────── */
.fbg-section {
    padding: 60px 0 70px;
    background: #FFFFFF;
}

.fbg-section .container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ── Section Header ──────────────────────────────────────── */
.fbg-section-header {
    text-align: center;
    margin-bottom: 40px;
}

.fbg-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(99, 102, 241, 0.08) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 50px;
    padding: 8px 20px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--fbg-accent);
    margin-bottom: 16px;
}

.fbg-badge i {
    font-size: 16px;
}

.fbg-section-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.65;
}

/* ── Tool Card ───────────────────────────────────────────── */
.fbg-card {
    background: #FFFFFF;
    border: 1px solid var(--fbg-border);
    border-radius: var(--fbg-radius-base);
    box-shadow: 0 4px 24px rgba(59, 130, 246, 0.07);
    overflow: visible;
}

/* ── Presets Row ─────────────────────────────────────────── */
.fbg-presets-row {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
    padding: 18px 24px;
    border-bottom: 1px solid var(--fbg-border);
}

.fbg-presets-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.09em;
    color: var(--fbg-muted);
    white-space: nowrap;
    flex-shrink: 0;
}

.fbg-preset-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.fbg-preset-btn {
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border: 1.5px solid var(--fbg-input-border);
    background: transparent;
    color: var(--fbg-label);
    transition: all 0.18s ease;
}

.fbg-preset-btn:hover {
    border-color: var(--fbg-accent);
    color: var(--fbg-accent);
}

.fbg-preset-btn.active {
    background: var(--fbg-accent);
    border-color: var(--fbg-accent);
    color: #fff;
}

/* ── Body ────────────────────────────────────────────────── */
.fbg-body {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 0;
    min-height: 540px;
}

/* ── Controls Column ─────────────────────────────────────── */
.fbg-controls-col {
    padding: 20px 24px;
    background: #F8FBFF;
    border-right: 1px solid var(--fbg-border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    max-height: 750px;
}

/* ── Control Section ─────────────────────────────────────── */
.fbg-control-section {
    border-top: 1px solid var(--fbg-border);
    margin-top: 4px;
}

.fbg-control-section:first-child {
    border-top: none;
}

/* ── Accordion Header ────────────────────────────────────── */
.fbg-acc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 13px 0;
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    gap: 8px;
}

.fbg-acc-header:hover .fbg-section-title {
    color: var(--fbg-accent);
}

.fbg-acc-chevron {
    font-size: 14px;
    color: var(--fbg-muted);
    transition: transform 0.22s ease;
    flex-shrink: 0;
}

.fbg-acc-header[aria-expanded="true"] .fbg-acc-chevron {
    transform: rotate(180deg);
}

.fbg-section-title {
    font-size: 11.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.09em;
    color: var(--fbg-label);
    transition: color 0.18s;
}

/* ── Accordion Body ──────────────────────────────────────── */
.fbg-acc-body {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding-bottom: 18px;
}

.fbg-acc-body[hidden] {
    display: none;
}

/* ── Advanced badge ──────────────────────────────────────── */
.fbg-adv-badge {
    display: inline-block;
    font-size: 9px;
    font-weight: 700;
    text-transform: none;
    letter-spacing: 0;
    color: #7C3AED;
    background: rgba(124, 58, 237, 0.1);
    border: 1px solid rgba(124, 58, 237, 0.22);
    border-radius: 4px;
    padding: 1px 5px;
    vertical-align: middle;
    margin-left: 6px;
    font-style: italic;
}

/* ── Hint tag ────────────────────────────────────────────── */
.fbg-hint-tag {
    display: inline-block;
    font-size: 9px;
    font-weight: 600;
    text-transform: none;
    letter-spacing: 0;
    color: var(--fbg-muted);
    background: rgba(71, 85, 105, 0.08);
    border-radius: 3px;
    padding: 1px 5px;
    vertical-align: middle;
    margin-left: 4px;
}

/* ── Control Group ───────────────────────────────────────── */
.fbg-control-group {
    display: flex;
    flex-direction: column;
    gap: 7px;
}

/* ── Labels ──────────────────────────────────────────────── */
.fbg-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--fbg-label);
    font-family: 'Fira Code', monospace;
}

.fbg-label-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.fbg-val-badge {
    font-size: 12px;
    font-weight: 600;
    color: var(--fbg-accent);
    background: rgba(59, 130, 246, 0.1);
    border-radius: 4px;
    padding: 2px 7px;
}

/* ── Option Button Groups ────────────────────────────────── */
.fbg-opt-group {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.fbg-opt-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 11px;
    border-radius: 7px;
    font-size: 12.5px;
    font-weight: 500;
    font-family: 'Fira Code', monospace;
    cursor: pointer;
    border: 1.5px solid var(--fbg-input-border);
    background: var(--fbg-input-bg);
    color: var(--fbg-muted);
    transition: all 0.16s ease;
    white-space: nowrap;
}

.fbg-opt-btn i {
    font-size: 13px;
}

.fbg-opt-btn:hover {
    border-color: var(--fbg-accent);
    color: var(--fbg-accent);
    background: rgba(59, 130, 246, 0.04);
}

.fbg-opt-btn.active {
    background: var(--fbg-accent);
    border-color: var(--fbg-accent);
    color: #FFFFFF;
}

/* ── Visual diagram option (justify / align icons) ───────── */
.fbg-opt-group--justify,
.fbg-opt-group--align {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
}

.fbg-opt-btn.fbg-opt-icon {
    flex-direction: column;
    gap: 5px;
    padding: 8px 6px 6px;
    font-size: 11px;
    font-family: 'Fira Code', monospace;
    text-align: center;
}

.fbg-opt-btn.fbg-opt-icon span:last-child {
    line-height: 1;
}

/* Mini diagram icons */
.fbg-icon-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2px;
    height: 18px;
    width: 100%;
}

/* Shared block style for mini items */
.fbg-icon-diagram::before,
.fbg-icon-diagram::after,
.fbg-icon-diagram b {
    content: '';
    display: block;
    width: 6px;
    height: 12px;
    border-radius: 2px;
    background: currentColor;
    opacity: 0.7;
    flex-shrink: 0;
}

/* justify-content diagrams */
.fbg-jc-start {
    justify-content: flex-start;
}

.fbg-jc-center {
    justify-content: center;
}

.fbg-jc-end {
    justify-content: flex-end;
}

.fbg-jc-between {
    gap: 8px;
    justify-content: space-between;
}

.fbg-jc-around {
    padding: 0 3px;
    justify-content: space-around;
}

.fbg-jc-evenly {
    justify-content: space-evenly;
}

/* align-items diagrams (varying heights) */
.fbg-ai-start::before {
    height: 12px;
    align-self: flex-start;
}

.fbg-ai-start::after {
    height: 8px;
    align-self: flex-start;
}

.fbg-ai-center::before {
    height: 12px;
    align-self: center;
}

.fbg-ai-center::after {
    height: 8px;
    align-self: center;
}

.fbg-ai-end::before {
    height: 12px;
    align-self: flex-end;
}

.fbg-ai-end::after {
    height: 8px;
    align-self: flex-end;
}

.fbg-ai-stretch::before {
    height: 100%;
}

.fbg-ai-stretch::after {
    height: 100%;
}

.fbg-ai-baseline::before {
    height: 14px;
    align-self: flex-end;
}

.fbg-ai-baseline::after {
    height: 9px;
    align-self: flex-end;
}

/* ── Range ───────────────────────────────────────────────── */
.fbg-range {
    width: 100%;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    border-radius: 2px;
    background: var(--fbg-input-border);
    cursor: pointer;
    accent-color: var(--fbg-accent);
}

.fbg-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--fbg-accent);
    cursor: pointer;
    border: 2px solid #fff;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.25);
}

/* ── Input ───────────────────────────────────────────────── */
.fbg-input {
    width: 100%;
    padding: 8px 12px;
    border-radius: var(--fbg-radius-sm);
    border: 1.5px solid var(--fbg-input-border);
    background: var(--fbg-input-bg);
    color: var(--fbg-text);
    font-size: 14px;
    font-weight: 500;
    font-family: 'Fira Code', monospace;
    transition: border-color 0.18s;
    box-sizing: border-box;
}

.fbg-input:focus {
    outline: none;
    border-color: var(--fbg-accent);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* ── Active-item row ─────────────────────────────────────── */
.fbg-active-item-row {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.fbg-active-item-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 700;
    color: #fff;
    background: var(--fbg-accent);
    flex-shrink: 0;
}

.fbg-item-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    flex: 1;
}

.fbg-item-pill {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    border: 1.5px solid var(--fbg-input-border);
    background: var(--fbg-input-bg);
    color: var(--fbg-muted);
    transition: all 0.16s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.fbg-item-pill:hover {
    border-color: var(--fbg-accent);
    color: var(--fbg-accent);
}

.fbg-item-pill.active {
    background: var(--fbg-accent);
    border-color: var(--fbg-accent);
    color: #fff;
}

.fbg-item-pill.fbg-item-pill--hidden {
    opacity: 0.3;
    pointer-events: none;
}

/* ── Reset item button ───────────────────────────────────── */
.fbg-reset-item-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border-radius: var(--fbg-radius-sm);
    border: 1.5px solid var(--fbg-input-border);
    background: transparent;
    color: var(--fbg-muted);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.18s;
    align-self: flex-start;
}

.fbg-reset-item-btn:hover {
    border-color: #EF4444;
    color: #EF4444;
}

.fbg-reset-item-btn i {
    font-size: 14px;
}

/* ── Output Column ───────────────────────────────────────── */
.fbg-output-col {
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
}

/* ── Preview Box ─────────────────────────────────────────── */
.fbg-preview-box {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.fbg-preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px 12px;
}

.fbg-preview-label {
    font-size: 15px;
    font-weight: 700;
    color: var(--fbg-text);
}

.fbg-preview-hint {
    font-size: 13px;
    color: var(--fbg-muted);
}

.fbg-preview-stage {
    flex: 1;
    padding: 24px;
    min-height: 240px;
    display: flex;
    align-items: stretch;
    min-width: 0;
    overflow: hidden;
}

/* The actual flex container users see */
.fbg-preview-container {
    flex: 1;
    min-width: 0;
    display: flex;
    /* overridden by JS */
    background: var(--fbg-stage-bg);
    border-radius: 12px;
    border: 1px solid var(--fbg-border);
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.05) 1px, transparent 1px);
    background-size: 20px 20px;
    overflow: auto;
    transition: all 0.2s ease;
}

/* ── Flex Items in Preview ───────────────────────────────── */
.fbg-item {
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 700;
    color: #fff;
    cursor: pointer;
    transition: outline 0.12s, transform 0.12s;
    user-select: none;
    position: relative;
    min-width: 32px;
    min-height: 28px;
}

.fbg-item:hover {
    outline: 2.5px solid rgba(255, 255, 255, 0.9);
    outline-offset: 2px;
}

.fbg-item.fbg-item--selected {
    outline: 3px solid #FFFFFF;
    outline-offset: 3px;
    box-shadow: 0 0 0 5px var(--fbg-accent);
    z-index: 2;
}

.fbg-item-num {
    font-size: 12px;
    font-weight: 700;
    opacity: 0.85;
}

/* Item color palette — 8 colors */
.fbg-item:nth-child(1) {
    background: #3B82F6;
}

.fbg-item:nth-child(2) {
    background: #8B5CF6;
}

.fbg-item:nth-child(3) {
    background: #10B981;
}

.fbg-item:nth-child(4) {
    background: #F59E0B;
}

.fbg-item:nth-child(5) {
    background: #EF4444;
}

.fbg-item:nth-child(6) {
    background: #06B6D4;
}

.fbg-item:nth-child(7) {
    background: #EC4899;
}

.fbg-item:nth-child(8) {
    background: #84CC16;
}

/* ── Code Box ────────────────────────────────────────────── */
.fbg-code-box {
    border-top: 1px solid var(--fbg-border);
    display: flex;
    flex-direction: column;
}

.fbg-code-top-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px 0;
}

.fbg-code-tabs {
    display: flex;
    gap: 4px;
}

.fbg-code-tab {
    padding: 7px 18px;
    border-radius: var(--fbg-radius-sm) var(--fbg-radius-sm) 0 0;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    background: transparent;
    color: var(--fbg-muted);
    transition: all 0.18s;
}

.fbg-code-tab:hover {
    color: var(--fbg-text);
}

.fbg-code-tab.active {
    background: var(--fbg-code-bg);
    border-color: var(--fbg-border);
    border-bottom-color: var(--fbg-code-bg);
    color: var(--fbg-accent);
}

.fbg-copy-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: var(--fbg-radius-sm);
    border: 1.5px solid var(--fbg-input-border);
    background: transparent;
    color: var(--fbg-label);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.18s;
}

.fbg-copy-btn:hover {
    border-color: var(--fbg-accent);
    color: var(--fbg-accent);
}

.fbg-copy-btn i {
    font-size: 15px;
}

.fbg-code-pre {
    margin: 0;
    padding: 20px;
    background: var(--fbg-code-bg);
    color: #1E293B;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 13.5px;
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-all;
    min-height: 180px;
    border-radius: 0 0 var(--fbg-radius-base) 0;
    overflow-x: auto;
}

/* ── Toast ───────────────────────────────────────────────── */
.fbg-toast {
    position: fixed;
    bottom: 28px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: #1E293B;
    color: #F1F5F9;
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 100px;
    padding: 10px 22px;
    font-size: 14px;
    font-weight: 500;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s ease;
    z-index: 9999;
    white-space: nowrap;
}

.fbg-toast.fbg-toast--visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ── Dimmed state (e.g. align-content when flex-wrap: nowrap) */
.fbg-dimmed {
    opacity: 0.38;
    pointer-events: none;
    user-select: none;
}

/* ── Accessibility — focus-visible ───────────────────────── */
.fbg-acc-header:focus-visible,
.fbg-preset-btn:focus-visible,
.fbg-code-tab:focus-visible,
.fbg-copy-btn:focus-visible,
.fbg-reset-item-btn:focus-visible {
    outline: 2px solid var(--fbg-accent);
    outline-offset: 2px;
    border-radius: var(--fbg-radius-sm);
}

.fbg-preset-btn:focus-visible {
    border-radius: 100px;
}

.fbg-opt-btn:focus-visible {
    outline: 2px solid var(--fbg-accent);
    outline-offset: 1px;
}

.fbg-item-pill:focus-visible {
    outline: 2px solid var(--fbg-accent);
    outline-offset: 1px;
}

.fbg-range:focus-visible {
    outline: none;
}

.fbg-range:focus-visible::-webkit-slider-thumb {
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.3);
}

.fbg-input:focus-visible {
    outline: 2px solid var(--fbg-accent);
    outline-offset: 0;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 1100px) {
    .fbg-body {
        grid-template-columns: 340px 1fr;
    }
}

@media (max-width: 900px) {
    .fbg-body {
        grid-template-columns: 1fr;
    }

    .fbg-controls-col {
        border-right: none;
        border-bottom: 1px solid var(--fbg-border);
        max-height: none;
    }

    .fbg-code-pre {
        border-radius: 0 0 var(--fbg-radius-base) var(--fbg-radius-base);
    }
}

@media (max-width: 640px) {
    .fbg-section {
        padding: 40px 0 60px;
    }

    .fbg-presets-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .fbg-opt-group--justify,
    .fbg-opt-group--align {
        grid-template-columns: repeat(3, 1fr);
    }

    .fbg-controls-col {
        padding: 16px;
    }

    .fbg-preview-stage {
        padding: 16px;
        min-height: 180px;
    }

    .fbg-preview-header {
        padding: 14px 16px 8px;
    }

    .fbg-code-top-row {
        flex-wrap: wrap;
        gap: 10px;
        padding: 12px 14px 0;
    }

    .fbg-code-pre {
        padding: 14px;
        font-size: 12px;
    }
}