.reveal .slides section {
    text-align: left;
}

.reveal .controls .controls-arrow {
    color: #B15A2B;
}

.reveal .progress span {
    background: #B15A2B;
}

.reveal .text-blue {
    color: #B15A2B !important;
}

.reveal .text-red {
    color: #E62727 !important;
}

.reveal .text-light {
    color: #666 !important;
}

.reveal .text-center {
    text-align: center !important;
}

.reveal .bg-light {
    background-color: #F7EFE6 !important;
}

.reveal .text-purple {
    color: #7B5EA7 !important;
}

.reveal .text-green {
    color: #2E7D32 !important;
}

.reveal .text-orange {
    color: #C2610F !important;
}

.reveal .text-teal {
    color: #B15A2B !important;
}

.reveal a {
    color: #B15A2B;
}

.reveal ul,
.reveal ol {
    padding-left: 1rem;
    line-height: 1.4em;
    margin-top: 0.3em;
    margin-bottom: 0.3em;
}

.reveal ul ul,
.reveal ol ol,
.reveal ul ol,
.reveal ol ul {
    font-size: 0.9em;
}

.reveal .footer {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    text-align: left;
    font-size: 1rem;
    color: #888;
}

/* Hide footer when the first slide is showing */
.reveal section:first-of-type.present~.footer {
    display: none;
}

.reveal .keyword {
    color: #2F3E7A;
    font-weight: 700;
}

.reveal .inline-code {
    font-family: 'Courier New', Courier, monospace;
    background-color: #f4f4f4;
    padding: 2px 4px;
    border-radius: 4px;
    /* font-weight: bold; */
    text-transform: none !important;
}

.reveal .slide-badge-row {
    text-align: right;
    margin: 0 0 0.35em;
}

.reveal .self-study-badge {
    display: inline-block;
    background: #90A4AE;
    color: white;
    font-size: 0.42em;
    padding: 3px 10px;
    border-radius: 16px;
    font-weight: 600;
}

.reveal .advanced-badge {
    display: inline-block;
    background: #7B5EA7;
    color: white;
    font-size: 0.42em;
    padding: 3px 10px;
    border-radius: 16px;
    font-weight: 600;
}

.reveal .fragment.blur {
    filter: blur(5px);
}

.reveal .fragment.blur.visible {
    filter: none;
}

.reveal .question-box {
    border: 3px solid #B15A2B;
    border-radius: 16px;
    padding: 0.75em;
    /* max-width: 700px; */
    margin: auto;
    background: #F7EFE6;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

.reveal .question-title {
    /* font-size: 1.2em; */
    font-weight: bold;
    color: #B15A2B;
    margin-bottom: 0.5em;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.reveal .question-content {
    /* font-size: 1.4em; */
    line-height: 1.4;
    color: #333;
}

/* Pipeline diagram */

.reveal .pipeline {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 0.5em;
    margin-top: 1em;
    flex-wrap: wrap;
}

.reveal .pipeline .stage {
    background: #F7EFE6;
    border: 2px solid #B15A2B;
    border-radius: 10px;
    padding: 0.5em;
    width: 140px;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

.reveal .pipeline .stage-title {
    font-weight: bold;
    color: #B15A2B;
    margin-bottom: 0.5em;
}

.reveal .pipeline .stage-desc {
    font-size: 0.8em;
    color: #333;
}

.reveal .pipeline .arrow {
    display: flex;
    align-items: center;
    font-size: 1.5em;
    color: #B15A2B;
}

.reveal .caption {
    text-align: center;
    margin-top: 0.8em;
    font-size: 0.8em;
    font-style: italic;
    color: #666;
}

.reveal .fst-italic {
    font-style: italic;
}

/* Responsive: stack nicely on narrow displays */
@media (max-width: 900px) {
    .reveal .pipeline {
        font-size: 0.8em;
    }

    .reveal .stage {
        width: 160px;
    }
}

@media (max-width: 680px) {
    .reveal .pipeline {
        gap: 0.6em;
    }

    .reveal .arrow {
        display: none;
    }

    .reveal .stage {
        width: 100%;
        max-width: 420px;
    }
}

/* Hide line numbers ONLY for code blocks with class 'no-line-numbers' */
.reveal pre code.no-line-numbers .hljs-ln-numbers {
    display: none !important;
}

/* Line numbers (when data-line-numbers): tránh wrap số 2 chữ số */
.reveal pre code .hljs-ln-numbers,
.reveal pre code .hljs-ln-numbers .hljs-ln-n {
    white-space: nowrap !important;
    text-align: right;
    padding-right: 8px;
    min-width: 1.6em;
    color: #888;
    user-select: none;
}

.reveal pre code .hljs-ln-line {
    vertical-align: top;
}

/* ============================================
   Sudoku grid (lec10) — 9x9 with thick 3x3 borders
   ============================================ */
.reveal .sudoku-grid {
    border-collapse: collapse;
    margin: 0 auto;
    font-size: 0.9em;
    font-family: var(--font-sans, sans-serif);
}

.reveal .sudoku-grid td {
    width: 34px;
    height: 34px;
    text-align: center;
    border: 1px solid #999;
    padding: 0;
}

.reveal .sudoku-grid tr:first-child td       { border-top: 2px solid #333; }
.reveal .sudoku-grid tr:nth-child(3n) td     { border-bottom: 2px solid #333; }
.reveal .sudoku-grid tr:last-child td        { border-bottom: 2px solid #333; }
.reveal .sudoku-grid td:first-child          { border-left: 2px solid #333; }
.reveal .sudoku-grid td:nth-child(3n)        { border-right: 2px solid #333; }
.reveal .sudoku-grid td:last-child           { border-right: 2px solid #333; }

.reveal .sudoku-grid td.highlight {
    background: #fff3cd;
    font-weight: bold;
}

/* Modifier: large grid (more readable on projector) */
.reveal .sudoku-grid--lg td {
    width: 46px;
    height: 46px;
    font-size: 1.15em;
}