/* Biomass Vietnam: phần CSS riêng cho WordPress (block lõi, header/footer dạng block, form gửi máy chủ).
   Giao diện chính nằm ở site.css, dùng chung với bản web tĩnh. */

/* Các phần nối liền nhau, không có khoảng trống mặc định giữa các block cấp cao nhất */
.wp-site-blocks { padding: 0; }
.wp-site-blocks > *, .bv-main > *, .bv-main .wp-block-post-content > * { margin-block: 0; }
.bv-main .wp-block-post-content { max-width: none; }
.bv-blog { padding: calc(var(--sc-section) + 40px) var(--sc-gutter) var(--sc-section); }

/* Header dạng block: logo (ảnh), menu (Điều hướng), ngôn ngữ (HTML), nút */
.bar figure.bar__mark { margin: 0; }
.bar .wp-block-navigation { margin-left: auto; font-size: var(--sc-t-sm); }
.bar .wp-block-navigation__container { gap: var(--sc-5); }
.bar .wp-block-navigation-item__content { padding: var(--sc-2) 0; color: var(--sc-ink); font-weight: 700; opacity: 0.9; text-decoration: none; }
.bar .wp-block-navigation-item__content:hover { opacity: 1; }
.bar .current-menu-item > .wp-block-navigation-item__content { opacity: 1; color: var(--sc-accent); box-shadow: inset 0 -2px 0 var(--sc-accent); }
.bar .wp-block-navigation__responsive-container-open { color: var(--sc-ink); }
.bar .wp-block-navigation__responsive-container.is-menu-open { background: var(--sc-canvas); color: var(--sc-ink); padding: var(--sc-6) var(--sc-5); }
.bar .wp-block-navigation__responsive-container.is-menu-open .wp-block-navigation-item__content { font-size: 1.25rem; padding: var(--sc-3) 0; }
.bar .wp-block-buttons { flex-wrap: nowrap; gap: var(--sc-3); }
.bar .bar__login .wp-block-button__link { min-height: 44px; }
@media (max-width: 860px) {
  .bar .wp-block-buttons { display: none; }
  .bar .wp-block-navigation { order: 3; margin-left: var(--sc-1); }
  .bar .lang { margin-left: auto; }
}
@media (max-width: 1180px) { .bar .bar__cta .bv-long { display: none; } }

/* Kiểu nút (chọn ở thanh bên phải khi chọn một nút) */
.wp-block-button[class*="is-style-bv-"] .wp-block-button__link {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--sc-2);
  min-height: 48px; padding: 0 var(--sc-5); border: 0; border-radius: var(--sc-r-pill);
  font-family: inherit; font-size: var(--sc-t-sm); font-weight: 700; white-space: nowrap; text-decoration: none;
  transition: transform var(--sc-d-fast) var(--sc-ease-out), background-color var(--sc-d-fast) var(--sc-ease-out), box-shadow var(--sc-d-fast) var(--sc-ease-out);
}
.wp-block-button.is-style-bv-primary .wp-block-button__link { background: var(--sc-accent); color: var(--sc-accent-ink); box-shadow: var(--sc-e2); }
.wp-block-button.is-style-bv-primary .wp-block-button__link:hover { background: #9EDD84; transform: translateY(-1px); }
.wp-block-button.is-style-bv-ghost .wp-block-button__link { background: transparent; color: var(--sc-ink); box-shadow: inset 0 0 0 1.5px rgb(243 248 241 / 0.5); }
.wp-block-button.is-style-bv-ghost .wp-block-button__link:hover { box-shadow: inset 0 0 0 1.5px var(--sc-ink); }
.wp-block-button.is-style-bv-dark .wp-block-button__link { background: var(--sc-canvas); color: var(--sc-ink); }
.wp-block-button.is-style-bv-dark .wp-block-button__link:hover { background: #1B3C58; transform: translateY(-1px); }
.wp-block-button.is-style-bv-outline-dark .wp-block-button__link { background: transparent; color: var(--sc-canvas); box-shadow: inset 0 0 0 1.5px rgb(14 34 51 / 0.45); }
.wp-block-button[class*="is-style-bv-"] .wp-block-button__link:focus-visible { outline: 2px solid var(--bv-sky); outline-offset: 3px; }

/* Phần nội dung dựng bằng block lõi */
.def-sec .def > * + * { margin-block-start: 0; }
.def-sec .wp-block-list.def__ex, .def-sec ul.def__ex { padding: 0; }
.def__full.wp-block-details > summary { margin: 0; }
.def__full.wp-block-details p { margin: var(--sc-2) 0 0; }
.faq .wp-block-buttons { margin-top: var(--sc-5); }
.faq__list.is-layout-flow > * { margin-block: 0; }
.qa.wp-block-details { padding: 0; }
.qa.wp-block-details > summary { list-style: none; }
.teaser--report .rteaser__covers figure { margin: 0; }
.teaser--report .wp-block-buttons, .end-card .wp-block-buttons { gap: var(--sc-3); }
.page-head .wp-block-list.jump, .page-head ul.jump { padding: 0; }
.foot__col p, .foot__brand p, .foot__bottom p { margin: 0; }
.foot__brand figure { margin: 0; }
.foot__brand .wp-block-buttons { margin-top: var(--sc-5); }
.foot .wp-block-heading { margin: 0 0 var(--sc-1); }

/* Form liên hệ gửi máy chủ */
.form__trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form__msg { margin: 0 0 var(--sc-4); padding: var(--sc-3) var(--sc-4); border-radius: var(--sc-r-md); font-weight: 600; font-size: var(--sc-t-sm); }
.form__msg--ok { background: var(--bv-mint); color: var(--bv-leaf); }
.form__msg--err { background: #FDECEC; color: #9B1C1C; }

/* Trang Đăng nhập dựng bằng block lõi */
.login .wp-block-buttons { display: grid; gap: var(--sc-3); }
.login .wp-block-button, .login .wp-block-button__link { width: 100%; }

/* Nút ngôn ngữ dạng link (bản dịch của trang đang xem) */
.lang a {
  display: inline-grid; place-items: center; min-width: 44px; min-height: 44px; border-radius: var(--sc-r-sm);
  color: var(--sc-ink); font-size: var(--sc-t-sm); font-weight: 600; text-decoration: none; opacity: 0.86;
}
.lang a:hover { opacity: 1; }
.lang a[aria-current="true"] { opacity: 1; color: var(--sc-accent); font-weight: 700; }
.lang a:focus-visible { outline: 2px solid var(--bv-sky); outline-offset: 3px; }
@media (max-width: 860px) { .lang a { min-width: 38px; } }

/* Bản 中文: chữ Hán dùng Noto Sans SC */
:lang(zh) body, body:lang(zh) { font-family: "Be Vietnam Pro", "Noto Sans SC", system-ui, sans-serif; }
:lang(zh) .sec-title { letter-spacing: 0; }

/* Lời dẫn "Biomass là gì?" dựng bằng đoạn văn lõi (chữ đậm là <strong>) */
.def__lead strong { font-weight: 800; }
.def-sec .def__src { font-size: var(--sc-t-xs); opacity: 0.8; }

/* ---------- Tin tức: trang danh sách, chuyên mục, nhãn ---------- */
.news-filter a[aria-current="page"] { background: var(--sc-accent); color: var(--sc-accent-ink); box-shadow: none; }
.news { background: var(--bv-sky); color: var(--sc-canvas); padding: clamp(2.5rem, 5vw, 4rem) 0 var(--sc-section); }
.ngrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr)); gap: var(--sc-5); margin: 0; padding: 0; list-style: none; }
.ncard { display: flex; flex-direction: column; overflow: hidden; border-radius: var(--sc-r-lg); background: #fff; box-shadow: 0 18px 40px -24px rgb(14 34 51 / 0.45); transition: transform var(--sc-d-fast) var(--sc-ease-out), box-shadow var(--sc-d-fast) var(--sc-ease-out); }
.ncard:hover { transform: translateY(-3px); box-shadow: 0 26px 48px -24px rgb(14 34 51 / 0.55); }
.ncard__img { display: block; aspect-ratio: 16 / 10; overflow: hidden; background: var(--sc-canvas); }
.ncard__img img { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform 600ms var(--sc-ease-out); }
.ncard:hover .ncard__img img { transform: scale(1.04); }
.ncard__ph { position: relative; display: block; width: 100%; height: 100%; background: linear-gradient(150deg, #163A57, var(--sc-canvas)); }
.ncard__leaves { position: absolute; right: 12%; bottom: 8%; width: 30%; opacity: 0.9; }
.ncard__body { display: flex; flex-direction: column; gap: var(--sc-2); flex: 1; padding: var(--sc-5); }
.ncard__cat { align-self: flex-start; padding: 2px var(--sc-3); border-radius: var(--sc-r-pill); background: var(--bv-mint); color: var(--bv-leaf); font-size: var(--sc-t-xs); font-weight: 700; text-decoration: none; }
.ncard h3 { margin: 0; font-size: var(--sc-t-lg); line-height: 1.3; }
.ncard h3 a { color: var(--sc-canvas); text-decoration: none; }
.ncard h3 a:hover { color: var(--bv-leaf); }
.ncard p { margin: 0; color: #3B5163; font-size: var(--sc-t-sm); line-height: 1.6; }
.ncard time { margin-top: auto; padding-top: var(--sc-2); color: #5E7488; font-size: var(--sc-t-xs); font-weight: 600; }
.news-empty { margin: 0; padding: var(--sc-6); border-radius: var(--sc-r-lg); background: #fff; text-align: center; font-weight: 600; }
.news-pages ul { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--sc-2); margin: var(--sc-7) 0 0; padding: 0; list-style: none; }
.news-pages a, .news-pages span { display: grid; place-items: center; min-width: 44px; min-height: 44px; padding: 0 var(--sc-3); border-radius: var(--sc-r-pill); background: #fff; color: var(--sc-canvas); font-weight: 700; text-decoration: none; }
.news-pages .current { background: var(--sc-canvas); color: var(--sc-ink); }
.news-pages .dots { background: none; }
.end-cta--news { padding-top: 0; }

/* ---------- Tin tức: trang bài viết ---------- */
.post-head { padding-bottom: 0; }
.post-head__crumbs { display: flex; flex-wrap: wrap; gap: var(--sc-2); font-size: var(--sc-t-sm); font-weight: 700; }
.post-head__crumbs a { color: var(--sc-accent); text-decoration: none; }
.post-head__crumbs span { opacity: 0.5; }
.post-head__title { max-width: 22ch; margin: var(--sc-4) 0 0; font-size: clamp(2rem, 1.3rem + 2.8vw, 3.6rem); line-height: 1.12; text-wrap: balance; }
.post-head .sec-lede { max-width: 44rem; }
.post-head__meta { margin: var(--sc-5) 0 0; color: var(--sc-ink-soft); font-size: var(--sc-t-sm); }
.post-head__img { position: relative; z-index: 1; max-width: 1080px; margin: var(--sc-7) auto -6rem; padding-inline: var(--sc-gutter); }
.post-head__img img { display: block; width: 100%; height: auto; max-height: 560px; object-fit: cover; border-radius: var(--sc-r-lg); box-shadow: var(--sc-e3); }
.post-body { background: #fff; color: var(--sc-canvas); padding: calc(6rem + var(--sc-7)) var(--sc-gutter) var(--sc-7); }
.post-head:not(:has(.post-head__img)) + .post-body { padding-top: var(--sc-7); }
.post-body .prose { max-width: 720px; margin-inline: auto; font-size: 1.075rem; line-height: 1.75; color: #24394B; }
.post-body .prose > * + * { margin-block-start: 1.1em; }
.post-body .prose h2 { margin-top: 2em; font-size: clamp(1.45rem, 1.2rem + 1vw, 1.9rem); line-height: 1.25; color: var(--sc-canvas); }
.post-body .prose h3 { margin-top: 1.6em; font-size: 1.25rem; line-height: 1.3; color: var(--sc-canvas); }
.post-body .prose a { color: var(--bv-leaf); font-weight: 600; text-decoration: underline; text-underline-offset: 3px; }
.post-body .prose ul, .post-body .prose ol { padding-left: 1.3em; }
.post-body .prose li + li { margin-top: 0.4em; }
.post-body .prose blockquote { margin-inline: 0; padding: var(--sc-4) var(--sc-5); border-radius: var(--sc-r-md); background: var(--bv-mint); box-shadow: inset 4px 0 0 var(--sc-accent); }
.post-body .prose blockquote p { margin: 0; }
.post-body .prose figure { margin-inline: 0; }
.post-body .prose img { max-width: 100%; height: auto; border-radius: var(--sc-r-md); }
.post-body .prose figcaption { margin-top: var(--sc-2); color: #5E7488; font-size: var(--sc-t-sm); text-align: center; }
.post-body .prose table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.post-body .prose th, .post-body .prose td { padding: var(--sc-2) var(--sc-3); border-bottom: 1px solid rgb(14 34 51 / 0.12); text-align: left; vertical-align: top; }
.post-body .prose th { background: var(--bv-mint); font-weight: 700; }
.post-body .prose .wp-block-table { overflow-x: auto; }
.post-body .prose .bv-note { padding: var(--sc-4) var(--sc-5); border-radius: var(--sc-r-md); background: var(--bv-sky); }
.post-foot__meta { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: var(--sc-4); max-width: calc(720px + 2 * var(--sc-gutter)); margin: 0 auto; padding: 0 var(--sc-gutter) var(--sc-7); background: #fff; }
.post-foot { background: #fff; }
.post-tags { display: flex; flex-wrap: wrap; gap: var(--sc-2); margin: 0; padding: 0; list-style: none; }
.post-tags a { display: inline-flex; min-height: 36px; align-items: center; padding: 0 var(--sc-3); border-radius: var(--sc-r-pill); background: var(--bv-mint); color: var(--bv-leaf); font-size: var(--sc-t-sm); font-weight: 700; text-decoration: none; }
.post-foot__back { color: var(--sc-canvas); font-weight: 700; text-decoration: none; }
.news--related { padding-top: var(--sc-7); }
.news--related .sec-title { margin: 0 0 var(--sc-5); }
@media (max-width: 860px) {
  .post-head__img { margin-bottom: -3rem; }
  .post-body { padding-top: calc(3rem + var(--sc-6)); }
}

/* ---------- Tài khoản: đăng nhập / đăng ký (2 tab, không cần JS) ---------- */
.login { width: min(100%, 480px); }
.acc-tabs { display: grid; grid-template-columns: 1fr 1fr; margin-top: var(--sc-5); }
.acc-tabs > input { position: absolute; opacity: 0; pointer-events: none; }
.acc-tabs > label { display: block; padding: var(--sc-3); border-bottom: 2px solid var(--sc-hairline); color: var(--sc-ink-soft); font-weight: 700; text-align: center; cursor: pointer; }
#acc-tab-login:checked + label, #acc-tab-reg:checked + label { border-color: var(--sc-accent); color: var(--sc-accent); }
.acc-tabs > input:focus-visible + label { outline: 2px solid var(--bv-sky); outline-offset: 2px; }
.acc-form { display: none; grid-column: 1 / -1; gap: var(--sc-4); margin-top: var(--sc-5); }
#acc-tab-login:checked ~ .acc-form--login, #acc-tab-reg:checked ~ .acc-form--reg { display: grid; }
.acc-form .btn { width: 100%; border: 0; font-family: inherit; cursor: pointer; }
.acc-form__row { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: var(--sc-2); font-size: var(--sc-t-sm); }
.acc-form__row a { color: var(--sc-accent); font-weight: 600; }
.login .acc-check { display: inline-flex; align-items: center; gap: var(--sc-2); font-weight: 500; }
.login .acc-check input { width: 18px; height: 18px; min-height: 0; padding: 0; accent-color: var(--sc-accent); }
.acc-form__note { margin: 0; color: var(--sc-ink-soft); font-size: var(--sc-t-xs); line-height: 1.6; }
.acc__status { margin-top: var(--sc-4) !important; padding: var(--sc-3) var(--sc-4); border-radius: var(--sc-r-md); font-weight: 600; }
.acc__status--approved { background: rgb(140 212 111 / 0.16); color: var(--sc-accent) !important; }
.acc__status--pending { background: rgb(255 196 87 / 0.14); color: #FFD27A !important; }
.acc__status--locked { background: rgb(255 120 120 / 0.14); color: #FFB3B3 !important; }
.login .form__msg { margin: var(--sc-4) 0 0; }
.login > .form__msg--ok { color: var(--bv-leaf); }
.login > .form__msg--err { color: #9B1C1C; }

/* ---------- Thư viện báo cáo và trình đọc PDF (thành viên) ---------- */
.lib { background: var(--sc-canvas); color: var(--sc-ink); padding: calc(var(--sc-section) + 40px) 0 var(--sc-section); }
.lib__head { max-width: 46rem; }
.lib__list { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: var(--sc-4); margin: var(--sc-7) 0 0; padding: 0; list-style: none; }
.lib__item { display: grid; grid-template-columns: 96px 1fr; gap: var(--sc-4); padding: var(--sc-4); border-radius: var(--sc-r-lg); background: var(--sc-surface); box-shadow: 0 0 0 1px var(--sc-hairline); }
.lib__item.is-open { box-shadow: 0 0 0 2px var(--sc-accent); }
.lib__cover { display: block; aspect-ratio: 1241 / 1755; overflow: hidden; border-radius: 6px; background: #fff; }
.lib__cover img { display: block; width: 100%; height: 100%; object-fit: cover; }
.lib__body { display: flex; flex-direction: column; gap: var(--sc-2); }
.lib__body b { font-size: var(--sc-t-lg); }
.lib__body > span { color: var(--sc-ink-soft); font-size: var(--sc-t-sm); line-height: 1.5; }
.lib__body .btn { align-self: flex-start; margin-top: auto; min-height: 40px; }
.lib__soon { margin-top: auto; color: #FFD27A !important; font-weight: 600; }
.reader { margin-top: var(--sc-7); border-radius: var(--sc-r-lg); overflow: hidden; background: #1B2B3A; box-shadow: 0 0 0 1px var(--sc-hairline), var(--sc-e3); scroll-margin-top: 90px; }
.reader:fullscreen { border-radius: 0; display: flex; flex-direction: column; }
.reader__bar { position: sticky; top: 0; z-index: 2; display: flex; flex-wrap: wrap; align-items: center; gap: var(--sc-3); padding: var(--sc-3) var(--sc-4); background: var(--sc-surface); border-bottom: 1px solid var(--sc-hairline); }
.reader__pos { color: var(--sc-ink-soft); font-size: var(--sc-t-sm); font-variant-numeric: tabular-nums; }
.reader__tools { display: flex; gap: var(--sc-2); margin-left: auto; }
.reader__tools button { display: grid; place-items: center; width: 40px; height: 40px; border: 0; border-radius: var(--sc-r-sm); background: rgb(243 248 241 / 0.08); color: var(--sc-ink); font-size: 1.1rem; font-weight: 700; cursor: pointer; }
.reader__tools button:hover { background: var(--sc-accent); color: var(--sc-accent-ink); }
.reader__tools button:focus-visible { outline: 2px solid var(--bv-sky); outline-offset: 2px; }
.reader__pages { height: min(82vh, 1100px); overflow: auto; overscroll-behavior: contain; padding: var(--sc-4); text-align: center; user-select: none; -webkit-user-select: none; }
.reader:fullscreen .reader__pages { flex: 1; height: auto; }
.reader__page { position: relative; display: inline-block; max-width: none; margin: 0 auto var(--sc-4); background: #fff; box-shadow: 0 10px 30px -12px rgb(0 0 0 / 0.6); vertical-align: top; }
.reader__page canvas { display: block; width: 100%; height: 100%; }
.reader__mark { position: absolute; inset: 0; z-index: 1; background-repeat: repeat; pointer-events: none; }
.reader__loading { margin: var(--sc-7) 0; color: var(--sc-ink-soft); }
@media (max-width: 860px) {
  .reader__pages { padding: var(--sc-2); height: 78vh; }
  .reader__tools button { width: 36px; height: 36px; }
}
@media print { .reader { display: none !important; } }

/* Trang 404 */
.not-found { min-height: 70svh; display: flex; align-items: center; }
.not-found__ctas { display: flex; flex-wrap: wrap; gap: var(--sc-3); margin: var(--sc-6) 0 0; }

/* Phần "Nhiệt trị và giá năng lượng" trên trang Nhiên liệu: khung trắng nổi trên nền xanh dương nhạt */
.mkt > .sc-wrap { max-width: calc(var(--sc-maxw) - 2 * var(--sc-gutter)); padding: clamp(1.5rem, 4vw, 3.25rem); border-radius: var(--sc-r-lg); background: #fff; box-shadow: 0 0 0 1px rgb(14 34 51 / 0.06), 0 30px 60px -30px rgb(14 34 51 / 0.45); }
.mkt .sec-title .t-alt { color: var(--bv-leaf); }
.mkt .stats { border-top-color: var(--sc-canvas); }
@media (max-width: 860px) { .mkt > .sc-wrap { margin-inline: var(--sc-4); width: auto; } }

/* Ngày cập nhật giá gần nhất, ngay trên ô lưu ý */
.price-updated { display: inline-flex; align-items: center; gap: var(--sc-2); margin: 0 0 var(--sc-3); padding: var(--sc-2) var(--sc-4); border-radius: var(--sc-r-pill); background: var(--sc-canvas); color: var(--sc-ink); font-size: var(--sc-t-sm); }
.price-updated svg { width: 18px; height: 18px; color: var(--sc-accent); flex: none; }
.price-updated b { color: var(--sc-accent); font-weight: 800; }
.acc-req { color: var(--sc-accent); font-weight: 800; }

/* ---------- Công cụ tính tiêu hao nhiên liệu (thành viên đã duyệt) ---------- */
.calc { background: var(--bv-sky); color: var(--sc-canvas); padding: clamp(2.5rem, 5vw, 4rem) 0 var(--sc-section); }
.calc__grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: var(--sc-6); align-items: start; }
.calc__form { display: grid; gap: var(--sc-5); }
.calc__form { min-width: 0; }
.calc__form fieldset { min-width: 0; margin: 0; padding: clamp(1.25rem, 3vw, 2rem); border: 0; border-radius: var(--sc-r-lg); background: #fff; box-shadow: 0 18px 40px -26px rgb(14 34 51 / 0.45); }
.calc__form legend { display: flex; align-items: center; gap: var(--sc-3); float: left; width: 100%; margin: 0 0 var(--sc-4); font-size: var(--sc-t-lg); font-weight: 800; }
.calc__form legend span { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: var(--sc-canvas); color: var(--sc-accent); font-size: var(--sc-t-sm); }
.calc__form legend + * { clear: both; }
.calc__fields { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--sc-4); margin-top: var(--sc-4); }
.calc__fields .wide { grid-column: 1 / -1; }
.calc__fields label { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--sc-1); min-width: 0; font-size: var(--sc-t-sm); font-weight: 700; }
.calc__fields .u { font-weight: 500; color: #5E7488; font-size: var(--sc-t-xs); }
.calc__fields input, .calc__fields select { box-sizing: border-box; width: 100%; min-width: 0; max-width: 100%; min-height: 48px; padding: 0 var(--sc-3); border: 1.5px solid rgb(14 34 51 / 0.18); border-radius: var(--sc-r-md); background: #fff; color: var(--sc-canvas); font: inherit; font-size: 16px; }
.calc__fields select { text-overflow: ellipsis; white-space: nowrap; overflow: hidden; }
.calc__fields input:focus, .calc__fields select:focus { outline: 2px solid var(--bv-leaf); outline-offset: 1px; border-color: transparent; }
.calc__form[data-kind="hoi"] .only-dau, .calc__form[data-kind="dau"] .only-hoi { display: none; }
.calc__form[data-flow="meter"] .only-pump, .calc__form[data-flow="pump"] .only-meter { display: none; }
.calc__sub { margin-top: var(--sc-5); padding-top: var(--sc-4); border-top: 1px solid rgb(14 34 51 / 0.1); }
.calc__sublbl { margin: 0 0 var(--sc-2); font-size: var(--sc-t-sm); font-weight: 800; }
.seg { display: inline-flex; flex-wrap: wrap; gap: 4px; padding: 4px; border-radius: var(--sc-r-pill); background: var(--bv-mint); }
.seg + .calc__fields, .pick + .seg { margin-top: var(--sc-4); }
.seg label { position: relative; cursor: pointer; }
.seg input, .pick input { position: absolute; opacity: 0; pointer-events: none; }
.seg span { display: inline-flex; align-items: center; min-height: 40px; padding: 0 var(--sc-4); border-radius: var(--sc-r-pill); font-weight: 700; font-size: var(--sc-t-sm); color: #3B5163; }
.seg input:checked + span { background: var(--sc-canvas); color: var(--sc-ink); }
.seg input:focus-visible + span, .pick input:focus-visible + span { outline: 2px solid var(--bv-leaf); outline-offset: 2px; }
.pick { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--sc-3); }
.pick label { cursor: pointer; }
.pick span { display: grid; gap: var(--sc-1); height: 100%; padding: var(--sc-4); border-radius: var(--sc-r-md); box-shadow: inset 0 0 0 1.5px rgb(14 34 51 / 0.15); font-size: var(--sc-t-xs); line-height: 1.5; color: #3B5163; }
.pick b { font-size: var(--sc-t-base); color: var(--sc-canvas); }
.pick input:checked + span { background: var(--bv-mint); box-shadow: inset 0 0 0 2px var(--bv-leaf); }
.calc__out { position: sticky; top: 96px; padding: clamp(1.5rem, 3vw, 2.25rem); border-radius: var(--sc-r-lg); background: var(--sc-canvas); color: var(--sc-ink); box-shadow: var(--sc-e3); }
.calc__lbl { margin: 0; color: var(--sc-ink-soft); font-size: var(--sc-t-sm); font-weight: 600; }
.calc__big { margin: var(--sc-1) 0 0; font-size: clamp(2.4rem, 1.8rem + 2.6vw, 3.6rem); font-weight: 800; line-height: 1.05; color: var(--sc-accent); font-variant-numeric: tabular-nums; }
.calc__big small { font-size: var(--sc-t-base); color: var(--sc-ink); font-weight: 700; }
.calc__range { margin: var(--sc-2) 0 0; color: var(--sc-ink-soft); font-size: var(--sc-t-sm); }
.calc__dl { display: grid; gap: 0; margin: var(--sc-5) 0 0; }
.calc__dl div { display: flex; justify-content: space-between; gap: var(--sc-4); padding: var(--sc-2) 0; border-bottom: 1px solid var(--sc-hairline); font-size: var(--sc-t-sm); }
.calc__dl dt { color: var(--sc-ink-soft); }
.calc__dl dd { margin: 0; font-weight: 800; font-variant-numeric: tabular-nums; text-align: right; }
.calc__dl dd small { display: block; font-weight: 500; font-size: var(--sc-t-xs); color: var(--sc-ink-soft); }
.calc__dl--cost { padding: var(--sc-2) var(--sc-4); border-radius: var(--sc-r-md); background: rgb(140 212 111 / 0.1); }
.calc__dl--cost div:last-child { border-bottom: 0; }
.calc__note { margin: var(--sc-4) 0 0; color: #FFD27A; font-size: var(--sc-t-sm); }
.calc__warn, .calc__info { display: grid; gap: var(--sc-2); margin: var(--sc-4) 0 0; padding: 0; list-style: none; font-size: var(--sc-t-sm); line-height: 1.5; }
.calc__warn li { padding: var(--sc-2) var(--sc-3); border-radius: var(--sc-r-sm); }
.calc__warn .is-warn { background: rgb(255 196 87 / 0.14); color: #FFD27A; }
.calc__warn .is-danger { background: rgb(255 120 120 / 0.16); color: #FFB3B3; font-weight: 700; }
.calc__info li { color: var(--sc-ink-soft); }
.calc__how { margin-top: var(--sc-4); font-size: var(--sc-t-sm); line-height: 1.6; }
.calc__how summary { cursor: pointer; color: var(--sc-accent); font-weight: 700; }
.calc__how ol { margin: var(--sc-3) 0 0; padding-left: 1.2em; color: var(--sc-ink-soft); }
.calc__how p { color: var(--sc-ink-soft); font-size: var(--sc-t-xs); }
.calc__cta { width: 100%; margin-top: var(--sc-5); }
@media (max-width: 960px) {
  .calc__grid { grid-template-columns: 1fr; }
  .calc__out { position: static; }
}
@media (max-width: 600px) {
  .calc__fields, .pick { grid-template-columns: minmax(0, 1fr); }
  /* Nút chọn 2 lựa chọn: chia đều bề ngang, chữ dài tự xuống dòng thay vì đẩy nút ra ngoài */
  .seg { display: grid; grid-auto-flow: column; grid-auto-columns: minmax(0, 1fr); width: 100%; box-sizing: border-box; border-radius: var(--sc-r-md); }
  .seg span { justify-content: center; width: 100%; box-sizing: border-box; min-height: 44px; padding: 6px var(--sc-2); border-radius: calc(var(--sc-r-md) - 4px); line-height: 1.25; text-align: center; }
}
/* Công cụ tính là một form dài: ẩn nút trượt nổi để không che kết quả */
body:has(.calc__form) .nav-hint { display: none; }

.calc__grid { min-height: 40vh; }
/* Nút tới công cụ tính, trên trang Nhiên liệu */
.fuel-tools { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--sc-3); margin: 0 0 var(--sc-3); }
.fuel-tools .price-updated { margin: 0; }
.calc-link { display: inline-flex; align-items: center; gap: var(--sc-3); padding: var(--sc-3) var(--sc-4); border-radius: var(--sc-r-md); background: var(--sc-canvas); color: var(--sc-ink); text-decoration: none; box-shadow: 0 12px 28px -16px rgb(14 34 51 / 0.6); transition: transform var(--sc-d-fast) var(--sc-ease-out); }
.calc-link:hover { transform: translateY(-2px); }
.calc-link:focus-visible { outline: 2px solid var(--bv-leaf); outline-offset: 3px; }
.calc-link svg { flex: none; width: 34px; height: 34px; padding: 6px; border-radius: var(--sc-r-sm); background: var(--sc-accent); color: var(--sc-accent-ink); }
.calc-link b { display: block; font-size: var(--sc-t-base); }
.calc-link small { display: block; color: var(--sc-ink-soft); font-size: var(--sc-t-xs); }
.calc-link__go { margin-left: var(--sc-2); color: var(--sc-accent); font-weight: 800; font-size: 1.2rem; }
@media (max-width: 600px) { .calc-link { width: 100%; } }
/* Trang công cụ khi chưa được dùng: giới thiệu + ảnh xem thử mờ + mời đăng ký */
.calc-lock__intro h2 { margin: 0 0 var(--sc-4); font-size: var(--sc-t-xl); }
.calc-lock__list { display: grid; gap: var(--sc-3); margin: 0; padding: 0; list-style: none; }
.calc-lock__list li { position: relative; padding: var(--sc-4) var(--sc-4) var(--sc-4) calc(var(--sc-4) + 26px); border-radius: var(--sc-r-md); background: #fff; line-height: 1.6; box-shadow: 0 10px 24px -20px rgb(14 34 51 / 0.5); }
.calc-lock__list li::before { content: "✓"; position: absolute; left: var(--sc-4); top: var(--sc-4); color: var(--bv-leaf); font-weight: 800; }
.calc-lock { position: relative; overflow: hidden; border-radius: var(--sc-r-lg); background: var(--sc-canvas); color: var(--sc-ink); box-shadow: var(--sc-e3); }
.calc-lock__sample { padding: clamp(1.5rem, 3vw, 2.25rem); filter: blur(6px); opacity: 0.55; user-select: none; }
.calc-lock__box { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: var(--sc-3); padding: var(--sc-6); text-align: center; background: rgb(14 34 51 / 0.55); }
.calc-lock__box svg { width: 44px; height: 44px; padding: 10px; border-radius: 50%; background: var(--sc-accent); color: var(--sc-accent-ink); }
.calc-lock__box b { font-size: var(--sc-t-lg); }
.calc-lock__box p { max-width: 28rem; margin: 0; color: var(--sc-ink-soft); font-size: var(--sc-t-sm); line-height: 1.6; }
.calc-lock__box .btn { min-width: 240px; }