/* Các trang /cong-cu/*. Mọi rule nằm trong .st-tool để không ảnh hưởng và không bị trùng với CSS chung của site. */
.st-tool {
  --green: #29B852;
  --green-nav: #47BA55;
  --orange: #F39C33;
  --ink: #212529;
  --dark: #232323;
  --page: #F7F7F7;
  --line: #D4D4D4;
  --num: #FFE23A;
  --blue: #3F55B5;
  --warn-bg: #FFF6EA;
  --warn-ink: #9A5A0A;
  --font-head: Roboto, sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", "Liberation Sans", Arial, sans-serif;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
}
.st-tool [hidden] { display: none !important; }
.st-tool img { max-width: 100%; }
.st-tool a { color: inherit; }
.st-tool :focus-visible { outline: 3px solid var(--orange); outline-offset: 2px; }

/* Đưa thẻ cơ bản về mặc định, tránh CSS của Bootstrap và style.css làm sai kiểu */
.st-tool p { margin: 1em 0; }
.st-tool h2, .st-tool h3 { line-height: 1.5; padding-bottom: 0; }
.st-tool ul { list-style: disc; }
.st-tool dt { font-weight: 400; }
.st-tool small { font-size: smaller; }
.st-tool legend { font-size: inherit; line-height: inherit; }

/* ===== Khung trang: nền xám tràn ngang màn hình dù nằm trong .container của header ===== */
.st-tool .page { background: var(--page); box-shadow: 0 0 0 100vmax var(--page); clip-path: inset(0 -100vmax); padding-bottom: 56px; }
.st-tool .st-wrap { max-width: 1140px; margin: 0 auto; }
.st-tool .crumbs { padding: 16px 0 0; font-size: 14px; color: #6c757d; }
.st-tool .crumbs a { text-decoration: none; color: #6c757d; }
.st-tool .crumbs a:hover { color: var(--green); }
.st-tool .page h1 { font-family: var(--font-head); font-weight: 700; color: var(--green); font-size: clamp(1.7rem, 4vw, 2.3rem); line-height: 1.2; margin: 18px 0 8px; }
.st-tool .page .st-subheading { font-family: var(--font-head); font-weight: 300; font-size: clamp(1.1rem, 2.4vw, 1.6rem); line-height: 1.3; margin: 0 0 28px; }

/* ===== Biểu mẫu ===== */
.st-tool .calc { display: grid; grid-template-columns: minmax(280px, 400px) minmax(0, 1fr); gap: 24px; align-items: start; }
.st-tool .card { display: block; background: #fff; border: 1px solid #e6e6e6; border-radius: 4px; padding: 20px; min-width: 0; }
.st-tool .card.form { display: grid; gap: 16px; }
.st-tool .card h2 { font-family: var(--font-head); font-weight: 500; font-size: 20px; margin: 0; color: var(--ink); }
.st-tool .field { display: grid; gap: 4px; min-width: 0; }
.st-tool .field > label, .st-tool .field > .lab { font-size: 14px; font-weight: 500; margin: 0; }
.st-tool .hint { font-size: 13px; color: #6c757d; }
.st-tool .inp { display: flex; border: 1px solid var(--line); background: #fff; }
.st-tool .inp:focus-within { border-color: var(--green); box-shadow: 0 0 0 2px rgba(41,184,82,.2); }
.st-tool .inp input, .st-tool .inp select { flex: 1; min-width: 0; width: auto; height: auto; border: 0; border-radius: 0; padding: 9px 10px; font: inherit; background: transparent; color: var(--ink); }
.st-tool .inp input:disabled { background: #f1f1f1; color: #6c757d; }
.st-tool .inp input:focus-visible, .st-tool .inp select:focus-visible { outline: none; }
.st-tool .inp .unit { display: grid; place-items: center; padding: 0 10px; font-size: 13px; color: #6c757d; background: #f4f4f4; border-left: 1px solid var(--line); white-space: nowrap; }
.st-tool .seg { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--line); }
.st-tool .seg button { border: 0; background: #fff; padding: 8px; cursor: pointer; font: inherit; font-size: 14px; color: var(--ink); }
.st-tool .seg button[aria-pressed="true"] { background: var(--green); color: #fff; font-weight: 500; }
.st-tool input[type=range] { width: 100%; accent-color: var(--green); }
.st-tool .range-row { display: flex; justify-content: space-between; font-size: 13px; color: #6c757d; }
.st-tool details.adv { border-top: 1px solid #eee; padding-top: 12px; }
.st-tool details.adv summary { cursor: pointer; font-weight: 500; }
.st-tool .adv-body { display: grid; gap: 14px; margin-top: 12px; }
.st-tool .linkbtn { background: none; border: 0; padding: 0; cursor: pointer; text-decoration: underline; color: var(--green); font: inherit; font-size: 13px; }

/* ===== Nút ===== */
.st-tool .btn { display: inline-block; border: 1px solid transparent; border-radius: 6px; padding: 9px 18px; font: inherit; font-weight: 500; cursor: pointer; text-decoration: none; text-align: center; line-height: 1.4; }
.st-tool .btn-primary { background: var(--green); color: #fff; }
.st-tool .btn-primary:hover { background: var(--green); color: #fff; filter: brightness(.94); }
.st-tool .btn-secondary { background: var(--orange); color: #fff; border-radius: 8px; font-size: 18px; padding: 10px 20px; }
.st-tool .btn-secondary:hover { background: var(--orange); color: #fff; filter: brightness(.95); }
.st-tool .btn-outline { background: #fff; border-color: var(--orange); color: #b86d0e; border-radius: 8px; }
.st-tool .btn-outline:hover { background: #fff6ea; border-color: var(--orange); color: #b86d0e; }
.st-tool .btn-small { padding: 4px 10px; font-size: 13px; border: 1px solid var(--line); background: #fff; border-radius: 4px; cursor: pointer; }

/* ===== Kết quả ===== */
.st-tool .result { display: grid; gap: 16px; min-width: 0; }
.st-tool .verdict { background: linear-gradient(110deg, var(--blue), var(--green-nav)); color: #fff; border-radius: 4px; padding: 22px 24px; display: grid; gap: 4px; }
.st-tool .verdict .lab { font-size: 14px; opacity: .9; }
.st-tool .verdict .big { font-family: var(--font-head); font-weight: 700; font-size: clamp(2.2rem, 6vw, 3.3rem); line-height: 1.05; color: var(--num); font-variant-numeric: tabular-nums; }
.st-tool .verdict .sub { font-size: 15px; max-width: 58ch; }
.st-tool .kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); border-top: 1px solid #e6e6e6; border-left: 1px solid #e6e6e6; background: #fff; margin: 0; }
.st-tool .kpi { padding: 12px 14px; border-right: 1px solid #e6e6e6; border-bottom: 1px solid #e6e6e6; min-width: 0; }
.st-tool .kpi dt { font-size: 13px; font-weight: 400; color: #6c757d; }
.st-tool .kpi dd { margin: 2px 0 0; font-weight: 500; font-size: 17px; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.st-tool .notice { font-size: 14px; color: #6c757d; border-left: 3px solid var(--orange); padding-left: 12px; margin: 0; }

/* ===== Biểu đồ SVG ===== */
.st-tool .card.chart-card h2 { font-size: 17px; }
.st-tool #chart { margin-top: 8px; width: 100%; }
.st-tool #chart svg { display: block; }
.st-tool .ch-grid { stroke: #e8e8e8; stroke-width: 1; }
.st-tool .ch-zero { stroke: #888; stroke-width: 1.5; }
.st-tool .ch-line { fill: none; stroke: var(--green); stroke-width: 2.5; stroke-linejoin: round; }
.st-tool .ch-area { fill: var(--green); opacity: .14; }
.st-tool .ch-mark { fill: var(--orange); stroke: var(--dark); stroke-width: 1.5; }
.st-tool .ch-drop { stroke: var(--orange); stroke-width: 1.5; stroke-dasharray: 3 4; }
.st-tool .ch-t { font-family: var(--font-body); font-size: 11px; fill: #6c757d; }
.st-tool .ch-tag { font-family: var(--font-body); font-size: 12px; fill: var(--ink); font-weight: 500; }

/* ===== Khối nhận báo giá ===== */
.st-tool .quote { border: 2px solid var(--orange); }
.st-tool .quote textarea { width: 100%; min-height: 96px; border: 1px solid var(--line); border-radius: 0; padding: 10px; font: inherit; font-size: 14px; color: var(--ink); resize: vertical; margin-top: 10px; }
.st-tool .quote .actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; align-items: center; }
.st-tool .quote .contact { margin-top: 12px; font-size: 14px; color: #555; }
.st-tool .quote .contact a { color: var(--green); font-weight: 500; }
.st-tool .copied { font-size: 13px; color: var(--green); }

/* ===== Liên kết liên quan, giả định ===== */
.st-tool .related { margin-top: 32px; }
.st-tool .related h2 { font-family: var(--font-head); font-weight: 500; font-size: 22px; margin: 0 0 12px; color: var(--ink); }
.st-tool .related ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; }
.st-tool .related a { display: block; height: 100%; background: #fff; border: 1px solid #e6e6e6; border-radius: 4px; padding: 14px 16px; text-decoration: none; font-weight: 500; }
.st-tool .related a small { display: block; font-weight: 400; color: #6c757d; margin-top: 2px; }
.st-tool .related a:hover { border-color: var(--green); }
.st-tool .related a.hot { border-color: var(--orange); }
/* Rộng hết khung như các khối trên; chia 2 cột trên màn hình rộng để mỗi dòng khoảng 70 ký tự */
.st-tool .assume { margin-top: 28px; color: #555; font-size: 14px; background: #fff; border: 1px solid #e6e6e6; border-radius: 4px; padding: 16px 20px; }
.st-tool .assume ul { margin: 8px 0 0; padding-left: 20px; list-style: disc; columns: 2 360px; column-gap: 40px; }
.st-tool .assume li { break-inside: avoid; margin-bottom: 4px; }

@media (max-width: 991px) {
  .st-tool .calc { grid-template-columns: minmax(0, 1fr); }
  .st-tool .page { padding-top: 16px; }
}
@media (max-width: 480px) {
  .st-tool .page { padding-top: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .st-tool * { transition: none !important; animation: none !important; }
}