:root {
    --tk-bg-light: #fafafa;
    --tk-bg-white: #fff;
    --tk-border-color: #ddd;
    --tk-border-dark: #333;
    --tk-text-color: #333;
    --tk-text-muted: #555;
    --tk-primary-color: #d00;
    --tk-secondary-color: #007cba;
    --tk-shadow-color: rgba(0,0,0,.04);
    --tk-header-bg: #f9f9f9;
}

#tk-chot-so-table {
    width: 600px;
    padding: 20px;
    background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
    border: 2px solid var(--tk-border-dark);
    font-family: Arial, sans-serif;
    text-align: center;
}

#tk-chot-so-table h2 {
    color: var(--tk-primary-color);
    margin-bottom: 5px;
    text-transform: uppercase;
}

#tk-chot-so-table p.date-text {
    margin-top: 0;
    color: var(--tk-text-muted);
    font-weight: bold;
}

#tk-chot-so-table table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
    background: var(--tk-bg-white);
}

#tk-chot-so-table td {
    padding: 12px;
    border: 1px solid var(--tk-border-color);
    font-weight: bold;
}

#tk-chot-so-table td.label-col {
    color: var(--tk-text-color);
    width: 40%;
}

#tk-chot-so-table td.value-col {
    color: var(--tk-primary-color);
    font-size: 18px;
}

#tk-chot-so-table td.value-col-normal {
    color: var(--tk-text-color);
    font-size: 16px;
}

#tk-chot-so-table p.footer-text {
    margin-top: 15px;
    font-size: 12px;
    color: var(--tk-text-muted);
}

/* --- Result Table & Dau/Duoi Styles --- */
.tk-result-container {
    display: flex;
    margin: 20px 0;
    gap: 2px;
}

.tk-table-result {
    width: 80%;
    border-collapse: collapse;
    border: 1px solid var(--tk-border-color);
    font-size: 14px;
}

.tk-table-result td {
    padding: 8px;
    border: 1px solid var(--tk-border-color);
    text-align: center;
}

.tk-table-result .giai-header {
    background: var(--tk-header-bg);
    font-weight: bold;
    width: 30%;
    text-align: left;
    padding-left: 15px;
}

.tk-table-result .giai-db {
    color: var(--tk-primary-color);
    font-weight: bold;
    font-size: 18px;
}

.tk-table-result .giai-so {
    font-weight: bold;
    color: var(--tk-text-color);
}

.tk-table-dau-duoi-wrap {
    display: flex;
}

.tk-table-dau, .tk-table-duoi {
    width: 50%;
    border-collapse: collapse;
    border: 1px solid var(--tk-border-color);
    font-size: 13px;
}

.tk-table-dau th, .tk-table-duoi th {
    background: var(--tk-header-bg);
    padding: 5px;
    border: 1px solid var(--tk-border-color);
}

.tk-table-dau td, .tk-table-duoi td {
    padding: 5px;
    border: 1px solid var(--tk-border-color);
    text-align: center;
}

.tk-table-dau td:first-child, .tk-table-duoi td:first-child {
    font-weight: bold;
    background: var(--tk-header-bg);
    width: 30px;
}

/* --- Number Formatting --- */
.tk-num {
    display: inline-block;
    padding: 0 5px;
    color: var(--tk-text-color);
    font-weight: bold;
}

.tk-db-tail {
    color: var(--tk-primary-color);
}



/* --- Pascal Pyramid --- */
.tk-pascal-pyramid {
    text-align: center;
        font-size: 16px;
    margin: 15px 0;
    line-height: 1.4;
    color: var(--tk-text-color);
    font-weight: bold;
    letter-spacing: 2px;
}
.tk-pascal-pyramid div:last-child {
    color: var(--tk-primary-color);
    font-size: 24px;
    margin-top: 10px;
}