/* ============================================================
   Calculator single — layout 2 cột + sidebar related
   ============================================================ */

.calc-single {
    padding-block: var(--vjol-space-10);
    overflow-x: clip;
}

.calc-single__layout {
    display: block;
}

@media (min-width: 1024px) {
    .calc-single__layout {
        display: grid;
        grid-template-columns: minmax(0, 1fr) 280px;
        gap: var(--vjol-space-10);
    }
}

.calc-single__main { min-width: 0; }

.calc-single__header { margin-bottom: var(--vjol-space-6); }

.calc-single__title {
    margin: 0 0 var(--vjol-space-3);
}

.calc-single__lead {
    color: var(--vjol-color-text-muted);
    font-size: var(--vjol-fs-base);
    line-height: var(--vjol-lh-loose);
    margin: 0;
    max-width: 70ch;
}

/* Safe content overflow */
.calc-single__main img,
.calc-single__main video,
.calc-single__main iframe,
.calc-single__main embed,
.calc-single__main picture {
    max-width: 100%;
    height: auto;
    display: block;
}

.calc-single__main table {
    display: block;
    max-width: 100%;
    overflow-x: auto;
}

/* ---------- Sidebar ---------- */

.calc-single__sidebar { display: none; }

@media (min-width: 1024px) {
    .calc-single__sidebar { display: block; }
}

.calc-related {
    position: sticky;
    top: calc(var(--vjol-header-height) + var(--vjol-space-4));
    background: var(--vjol-color-surface);
    border: 1px solid var(--vjol-color-border);
    border-radius: var(--vjol-radius-md);
    padding: var(--vjol-space-5);
    max-height: calc(100vh - var(--vjol-header-height) - var(--vjol-space-8));
    overflow-y: auto;
    scrollbar-width: thin;
}

.calc-related__title {
    margin: 0 0 var(--vjol-space-4);
    font-size: var(--vjol-fs-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--vjol-color-text-muted);
    font-weight: var(--vjol-fw-semibold);
}

.calc-related__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
}

.calc-related__item { margin: 0; }

.calc-related__link {
    display: block;
    padding: var(--vjol-space-2) var(--vjol-space-3);
    border-radius: var(--vjol-radius-sm);
    color: var(--vjol-color-text);
    text-decoration: none;
    line-height: var(--vjol-lh-snug);
    transition: background-color var(--vjol-duration-fast) var(--vjol-ease-out),
                color var(--vjol-duration-fast) var(--vjol-ease-out);
}
.calc-related__link:hover,
.calc-related__link:focus-visible {
    background: var(--vjol-color-bg);
    color: var(--vjol-color-primary);
}

/* ============================================================
   Dem-ngay info-boxes (server-side dynamic boxes)
   ============================================================ */

.dn-box {
    margin-block: var(--vjol-space-10) 0;
    padding: var(--vjol-space-6);
    background: var(--vjol-color-surface);
    border: 1px solid var(--vjol-color-border);
    border-radius: var(--vjol-radius-lg);
}

.dn-box__title {
    margin: 0 0 var(--vjol-space-2);
    font-size: var(--vjol-fs-xl);
    line-height: var(--vjol-lh-snug);
    color: var(--vjol-color-heading);
}

.dn-box__lead {
    margin: 0 0 var(--vjol-space-5);
    color: var(--vjol-color-text-muted);
    line-height: var(--vjol-lh-normal);
}

.dn-box__foot {
    margin: var(--vjol-space-5) 0 0;
    padding-top: var(--vjol-space-4);
    border-top: 1px dashed var(--vjol-color-border);
    color: var(--vjol-color-text-muted);
    font-size: var(--vjol-fs-sm);
}

/* Box 1: multi-unit */
.dn-units {
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
    gap: var(--vjol-space-3);
}
.dn-units__item {
    margin: 0;
    padding: var(--vjol-space-3) var(--vjol-space-2);
    background: var(--vjol-color-bg);
    border: 1px solid var(--vjol-color-border);
    border-radius: var(--vjol-radius-md);
    text-align: center;
}
.dn-units__item dt {
    margin: 0;
    font-size: var(--vjol-fs-xs);
    font-weight: var(--vjol-fw-medium);
    color: var(--vjol-color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.dn-units__item dd {
    margin: var(--vjol-space-1) 0 0;
    font-size: var(--vjol-fs-2xl);
    font-weight: var(--vjol-fw-bold);
    color: var(--vjol-color-heading);
    line-height: 1.1;
    font-variant-numeric: tabular-nums;
}

/* Box 2: year table */
.dn-year-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--vjol-color-bg);
    border: 1px solid var(--vjol-color-border);
    border-radius: var(--vjol-radius-md);
    overflow: hidden;
}
.dn-year-table th,
.dn-year-table td {
    padding: var(--vjol-space-3) var(--vjol-space-4);
    text-align: left;
    border-bottom: 1px solid var(--vjol-color-border);
    font-variant-numeric: tabular-nums;
}
.dn-year-table th {
    background: var(--vjol-color-surface);
    font-weight: var(--vjol-fw-semibold);
    font-size: var(--vjol-fs-sm);
    color: var(--vjol-color-heading);
}
.dn-year-table tr:last-child td { border-bottom: 0; }
.dn-year-table tr.is-past td { color: var(--vjol-color-text-muted); }

.dn-tag {
    display: inline-block;
    padding: 2px 10px;
    background: var(--vjol-color-surface-2);
    border-radius: var(--vjol-radius-full);
    font-size: var(--vjol-fs-xs);
    color: var(--vjol-color-text-muted);
}
.dn-tag--now {
    background: var(--vjol-color-primary-soft);
    color: var(--vjol-color-primary);
    font-weight: var(--vjol-fw-semibold);
}

/* Box 3: milestones */
.dn-milestones {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--vjol-space-5);
}
@media (min-width: 640px) {
    .dn-milestones { grid-template-columns: 1fr 1fr; }
}
.dn-milestones__head {
    margin: 0 0 var(--vjol-space-3);
    font-size: var(--vjol-fs-base);
    font-weight: var(--vjol-fw-semibold);
    color: var(--vjol-color-heading);
}
.dn-milestone {
    padding: var(--vjol-space-3) var(--vjol-space-4);
    background: var(--vjol-color-bg);
    border: 1px solid var(--vjol-color-border);
    border-radius: var(--vjol-radius-md);
    margin-bottom: var(--vjol-space-2);
}
.dn-milestone:last-child { margin-bottom: 0; }
.dn-milestone__label {
    margin: 0 0 var(--vjol-space-1);
    font-weight: var(--vjol-fw-semibold);
    color: var(--vjol-color-heading);
    font-size: var(--vjol-fs-sm);
}
.dn-milestone__date {
    margin: 0;
    color: var(--vjol-color-text-muted);
    font-size: var(--vjol-fs-sm);
    font-variant-numeric: tabular-nums;
}
.dn-milestone__diff {
    margin: var(--vjol-space-1) 0 0;
    color: var(--vjol-color-primary);
    font-size: var(--vjol-fs-sm);
    font-weight: var(--vjol-fw-medium);
}

/* Dem-ngay explanation box (tóm tắt nhanh) */
.dn-explain {
    background: linear-gradient(180deg, var(--vjol-color-primary-soft) 0%, var(--vjol-color-bg) 60%);
    border-color: var(--vjol-color-primary-soft);
}
.dn-explain__intro {
    margin: 0 0 var(--vjol-space-4);
    font-size: var(--vjol-fs-lg);
    line-height: var(--vjol-lh-normal);
    color: var(--vjol-color-heading);
}
.dn-explain__intro {
    margin: 0 0 var(--vjol-space-5);
}

/* Fields: dl key-value rows giống "Thông tin nhanh" cũ */
.dn-explain__fields {
    margin: 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--vjol-space-2);
}
.dn-explain__row {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--vjol-space-1);
    padding: var(--vjol-space-3);
    background: var(--vjol-color-bg);
    border: 1px solid var(--vjol-color-border);
    border-radius: var(--vjol-radius-md);
}
@media (min-width: 640px) {
    .dn-explain__fields { grid-template-columns: 1fr 1fr; }
    .dn-explain__row {
        grid-template-columns: minmax(140px, 0.4fr) 1fr;
        align-items: baseline;
        gap: var(--vjol-space-3);
    }
}
.dn-explain__label {
    margin: 0;
    font-size: var(--vjol-fs-xs);
    font-weight: var(--vjol-fw-semibold);
    color: var(--vjol-color-text-muted);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.dn-explain__value {
    margin: 0;
    font-size: var(--vjol-fs-sm);
    color: var(--vjol-color-heading);
    line-height: var(--vjol-lh-snug);
}

/* ============================================================
   Dong-ho boxes — use-cases + FAQ accordion
   ============================================================ */

/* Use cases checklist */
.dh-use-cases__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--vjol-space-2);
}
@media (min-width: 640px) {
    .dh-use-cases__list { grid-template-columns: 1fr 1fr; }
}
.dh-use-cases__item {
    position: relative;
    margin: 0;
    padding: var(--vjol-space-3) var(--vjol-space-4) var(--vjol-space-3) calc(var(--vjol-space-4) + 22px);
    background: var(--vjol-color-bg);
    border: 1px solid var(--vjol-color-border);
    border-radius: var(--vjol-radius-md);
    font-size: var(--vjol-fs-sm);
    line-height: var(--vjol-lh-snug);
    color: var(--vjol-color-text);
}
.dh-use-cases__item::before {
    content: "✓";
    position: absolute;
    left: var(--vjol-space-3);
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--vjol-color-primary);
    color: var(--vjol-c-white);
    font-size: 11px;
    font-weight: var(--vjol-fw-bold);
    line-height: 16px;
    text-align: center;
}

/* FAQ accordion */
.dh-faq__list {
    display: grid;
    gap: var(--vjol-space-2);
}
.dh-faq__item {
    background: var(--vjol-color-bg);
    border: 1px solid var(--vjol-color-border);
    border-radius: var(--vjol-radius-md);
    overflow: hidden;
}
.dh-faq__q {
    list-style: none;
    cursor: pointer;
    padding: var(--vjol-space-3) var(--vjol-space-4);
    padding-right: calc(var(--vjol-space-4) + 24px);
    font-weight: var(--vjol-fw-semibold);
    color: var(--vjol-color-heading);
    line-height: var(--vjol-lh-snug);
    position: relative;
    transition: background var(--vjol-duration-fast) var(--vjol-ease-out);
}
.dh-faq__q::-webkit-details-marker { display: none; }
.dh-faq__q::after {
    content: "";
    position: absolute;
    right: var(--vjol-space-4);
    top: 50%;
    width: 9px;
    height: 9px;
    border-right: 2px solid var(--vjol-color-text-muted);
    border-bottom: 2px solid var(--vjol-color-text-muted);
    transform: translateY(-70%) rotate(45deg);
    transition: transform var(--vjol-duration-fast) var(--vjol-ease-out);
}
.dh-faq__item[open] > .dh-faq__q::after {
    transform: translateY(-30%) rotate(-135deg);
}
.dh-faq__item[open] > .dh-faq__q,
.dh-faq__q:hover {
    background: var(--vjol-color-surface);
}
.dh-faq__a {
    padding: 0 var(--vjol-space-4) var(--vjol-space-4);
    color: var(--vjol-color-text);
    line-height: var(--vjol-lh-normal);
}