/* matrix-calc.css — Matrix Calculator styles */

.mx-main { max-width: 960px; }

/* ── Section ────────────────────────────────────────────────────────────────── */
.mx-section {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.1rem 1.2rem;
    margin-bottom: 1rem;
}

.mx-section-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

/* ── Config row ─────────────────────────────────────────────────────────────── */
.mx-config-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    align-items: flex-end;
}

.mx-field {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.mx-label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.mx-small-sel { width: 80px; }
.mx-toggle-label { display: flex; align-items: center; gap: 0.4rem; font-size: 0.88rem; cursor: pointer; }
.mx-toggle-label input { flex-shrink: 0; }
.mx-build-btn { align-self: flex-end; padding: 0.55rem 1.4rem; }

/* ── Presets ────────────────────────────────────────────────────────────────── */
.mx-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    align-items: center;
    margin-top: 0.8rem;
    padding-top: 0.7rem;
    border-top: 1px solid var(--color-border);
}

.mx-preset-label {
    font-size: 0.78rem;
    color: var(--color-text-muted);
    font-weight: 600;
    margin-right: 0.2rem;
}

.mx-preset-btn {
    background: #f0f4fa;
    border: 1px solid #c5d8f8;
    border-radius: var(--radius-sm);
    padding: 0.25rem 0.65rem;
    font-size: 0.78rem;
    cursor: pointer;
    color: var(--color-primary);
    font-family: var(--font-main);
    font-weight: 600;
    transition: background 0.15s;
}
.mx-preset-btn:hover { background: #d8eafc; }

/* ── Matrix input grid ──────────────────────────────────────────────────────── */
.mx-hint-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.6rem;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.mx-hint {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.mx-hint code {
    font-family: var(--font-mono);
    background: #f0f4fa;
    padding: 0.05rem 0.3rem;
    border-radius: 3px;
    font-size: 0.78rem;
}

.mx-hint-actions { display: flex; gap: 0.4rem; }

.mx-small-btn {
    background: #f8f9fa;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 0.25rem 0.6rem;
    font-size: 0.75rem;
    cursor: pointer;
    color: var(--color-text-muted);
    font-family: var(--font-main);
    transition: border-color 0.15s, color 0.15s;
}
.mx-small-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }

.mx-grid-wrap {
    overflow-x: auto;
    padding-bottom: 0.3rem;
}

.mx-grid {
    display: inline-grid;
    gap: 4px;
    border-left: 3px solid var(--color-text-muted);
    border-right: 3px solid var(--color-text-muted);
    padding: 6px 10px;
    position: relative;
    border-radius: 2px;
}

/* Top/bottom bracket lines */
.mx-grid::before,
.mx-grid::after {
    content: "";
    position: absolute;
    left: -3px;
    right: -3px;
    height: 3px;
    background: var(--color-text-muted);
}
.mx-grid::before { top: 0; }
.mx-grid::after  { bottom: 0; }

.mx-cell {
    width: 64px;
    height: 36px;
    padding: 0.3rem 0.4rem;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.88rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color 0.15s, background 0.15s;
    box-sizing: border-box;
}

.mx-cell:focus {
    outline: none;
    border-color: var(--color-primary);
    background: #fff;
}

.mx-cell.aug-col {
    border-color: #a0c4ff;
    background: #f0f6ff;
}

.mx-cell.aug-col:focus {
    border-color: var(--color-primary);
    background: #fff;
}

.mx-cell.var-col {
    border-color: #a8d8a8;
    background: #f0fff0;
    min-width: 80px;
    width: 80px;
}

.mx-cell.var-col:focus {
    border-color: #2d8a2d;
    background: #fff;
}

/* Separator: thick right border on the last base column cell */
.mx-cell.mx-sep-right {
    border-right: 2px solid #555 !important;
}

.mx-var-note {
    background: #f0fff0;
    border: 1px solid #a8d8a8;
    border-radius: var(--radius-md);
    padding: 0.55rem 0.85rem;
    font-size: 0.82rem;
    color: #155724;
    margin: 0.6rem 0;
}
.mx-var-note.hidden { display: none; }
.mx-var-note code {
    font-family: var(--font-mono);
    background: #d4edda;
    padding: 0.05rem 0.3rem;
    border-radius: 3px;
}

.mx-solve-btn {
    width: 100%;
    margin-top: 0.9rem;
    padding: 0.8rem;
    font-size: 0.98rem;
}

/* ── Summary grid ───────────────────────────────────────────────────────────── */
.mx-summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 0.5rem;
}

.mx-summary-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0.55rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.mx-summary-key {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

.mx-summary-val {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-mono);
}

.mx-summary-val.good  { color: #155724; }
.mx-summary-val.warn  { color: #856404; }
.mx-summary-val.bad   { color: #721c24; }

/* ── Matrix display (result / steps) ───────────────────────────────────────── */
.mx-matrix-display {
    overflow-x: auto;
    padding: 0.3rem 0;
}

.mx-display-grid {
    display: inline-grid;
    gap: 3px;
    border-left: 3px solid #555;
    border-right: 3px solid #555;
    padding: 5px 10px;
    position: relative;
    border-radius: 2px;
}

.mx-display-grid::before,
.mx-display-grid::after {
    content: "";
    position: absolute;
    left: -3px; right: -3px;
    height: 3px;
    background: #555;
}
.mx-display-grid::before { top: 0; }
.mx-display-grid::after  { bottom: 0; }

.mx-dval {
    min-width: 56px;
    padding: 0.25rem 0.5rem;
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-text);
    background: none;
    border-radius: 2px;
}

.mx-dval.pivot-col { background: #fff8e1; font-weight: 700; color: #856404; }
.mx-dval.aug       { background: #f0f6ff; }
.mx-dval.var       { background: #f0fff0; }
.mx-dval.zero      { color: var(--color-text-muted); }
.mx-dval.highlighted { background: #e8f0fe; font-weight: 700; }

/* Separator on display cells (result matrix / steps) */
.mx-dval.mx-sep-right {
    border-right: 2px solid #666 !important;
}

/* ── Steps ──────────────────────────────────────────────────────────────────── */
.mx-steps-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
    margin: -1.1rem -1.2rem 0;
    padding: 1.1rem 1.2rem;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    transition: background 0.15s;
}
.mx-steps-header:hover { background: #f5f7fa; }

.mx-steps-arrow {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    transition: transform 0.2s;
}
.mx-steps-arrow.open { transform: rotate(180deg); }

.mx-steps-body { display: none; padding-top: 0.8rem; }
.mx-steps-body.open { display: block; }

/* ── Individual step ────────────────────────────────────────────────────────── */
.mx-step {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #f0f0f0;
}
.mx-step:last-child { border-bottom: none; margin-bottom: 0; }

.mx-step-label {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--color-text-muted);
    margin-bottom: 0.35rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.mx-step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    font-size: 0.72rem;
    font-weight: 700;
    flex-shrink: 0;
}

.mx-op-desc {
    font-family: var(--font-mono);
    font-size: 0.88rem;
    background: #1e1e2e;
    color: #cdd6f4;
    padding: 0.35rem 0.8rem;
    border-radius: var(--radius-sm);
    display: inline-block;
    margin-bottom: 0.45rem;
}

.mx-op-desc .op-scale   { color: #f9e2af; }  /* yellow */
.mx-op-desc .op-swap    { color: #89dceb; }  /* cyan */
.mx-op-desc .op-add     { color: #a6e3a1; }  /* green */
.mx-op-desc .op-pivot   { color: #cba6f7; }  /* purple */
.mx-op-desc .op-done    { color: #a6e3a1; }  /* green */

/* ── Solution body ──────────────────────────────────────────────────────────── */
.mx-solution {
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--color-text);
}

.mx-solution p { margin: 0.3rem 0; }

.mx-solution .sol-eq {
    font-family: var(--font-mono);
    background: #1e1e2e;
    color: #cdd6f4;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    display: block;
    margin: 0.4rem 0;
    font-size: 0.88rem;
    white-space: pre;
    overflow-x: auto;
}

.mx-solution .sol-label {
    font-weight: 700;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--color-text-muted);
    margin-top: 0.75rem;
    margin-bottom: 0.2rem;
    display: block;
}

.mx-solution .sol-free  { color: #856404; font-weight: 600; }
.mx-solution .sol-inconsistent { color: #721c24; font-weight: 700; }
.mx-solution .sol-unique { color: #155724; font-weight: 700; }
.mx-solution .sol-infinite { color: #1a3c6e; font-weight: 700; }

/* ── Tooltip ────────────────────────────────────────────────────────────────── */
.mx-info-icon { cursor: pointer; font-size: 0.8rem; opacity: 0.65; user-select: none; }
.mx-info-icon:hover { opacity: 1; }

.mx-tooltip {
    position: fixed;
    z-index: 999;
    max-width: 300px;
    background: #1e1e2e;
    color: #cdd6f4;
    font-size: 0.8rem;
    line-height: 1.5;
    padding: 0.6rem 0.9rem;
    border-radius: var(--radius-md);
    pointer-events: none;
    display: none;
    box-shadow: 0 4px 18px rgba(0,0,0,0.28);
}
.mx-tooltip.visible { display: block; }

/* ── Responsive ─────────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
    .mx-config-row { flex-direction: column; align-items: flex-start; }
    .mx-build-btn { width: 100%; }
    .mx-cell { width: 52px; font-size: 0.82rem; }
    .mx-summary-grid { grid-template-columns: 1fr 1fr; }
    .mx-preset-btn { font-size: 0.72rem; padding: 0.2rem 0.5rem; }
}