@font-face { font-family: "Short Stack"; src: url("Short_Stack/ShortStack-Regular.ttf") format("truetype"); font-style: normal; font-weight: 400; font-display: swap; }
:root { color-scheme: light; --ink: #253e38; --muted: #74857c; --green: #376a55; --paper: #f7f6f0; --line: #e7e9e1; }
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: "Segoe UI", Arial, sans-serif; }
button, select, input { font: inherit; }
button { cursor: pointer; }
button:focus-visible, select:focus-visible, input:focus-visible, a:focus-visible, summary:focus-visible { outline: 3px solid #e6a967; outline-offset: 3px; }
.site-header { padding: 28px 5%; display: flex; align-items: center; justify-content: space-between; gap: 30px; background: #f3f4fa; color: #292e36; }
.brand { display: inline-flex; gap: 8px; align-items: center; color: inherit; text-decoration: none; font-size: 18px; font-weight: 500; line-height: 1.15; text-transform: uppercase; letter-spacing: 3px; }
.brand img { width: 52px; height: 52px; object-fit: contain; }
.site-navigation { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 30px; }
.site-navigation a, .nav-menu summary { color: inherit; text-decoration: none; font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .28em; }
.nav-menu { position: relative; }
.nav-menu summary { cursor: pointer; list-style: none; }
.nav-menu summary::-webkit-details-marker { display: none; }
.nav-menu summary::after { content: "\2304"; margin-left: 5px; letter-spacing: 0; }
.nav-submenu { position: absolute; z-index: 4; top: 100%; right: 0; min-width: 200px; padding: 10px 0; background: #f6f8fd; box-shadow: 0 8px 18px rgba(37, 46, 60, .12); }
.nav-submenu a { display: block; padding: 10px 16px; }
.site-navigation a:hover, .footer-bottom a:hover { text-decoration: underline; }
main { max-width: 1170px; margin: auto; padding: 39px 24px 0; }
.workspace { background: #fff; border: 1px solid #e8ebe4; border-radius: 17px; box-shadow: 0 14px 45px rgba(53, 78, 60, .055); overflow: hidden; }
.workspace-top { padding: 29px 35px 20px; }
.section-kicker { font-size: 10px; font-weight: 700; letter-spacing: 1.5px; color: #a6b8a7; }
h1 { font-family: Georgia, serif; font-weight: 400; }
h1 { font-size: 30px; margin: 7px 0 5px; letter-spacing: -.5px; }
h1 span { color: #d3b07b; font-size: 19px; }
.workspace-top p, .worksheet-heading p { color: var(--muted); font-size: 12px; line-height: 1.6; margin: 0; }
.mode-switch { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 35px 20px; }
.mode-button { border: 1px solid #dce8da; border-radius: 7px; padding: 10px 14px; background: #f0f5ed; color: var(--ink); font-size: 12px; font-weight: 700; }
.mode-button[aria-pressed="true"] { background: var(--green); border-color: var(--green); color: #fff; }
#settings-form { margin: 0 35px 22px; }
.settings { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 12px; }
.control { display: flex; flex-direction: column; gap: 5px; }
.control label, .custom-row label { font-size: 11px; font-weight: 700; color: #71847a; }
select, input { padding: 10px 12px; border: 1px solid #e2e8df; border-radius: 7px; background: #fff; color: var(--ink); font-size: 12px; }
input[type="number"] { width: 110px; }
.settings-help, .custom-editor p { color: var(--muted); font-size: 11px; line-height: 1.5; }
.custom-editor { margin: 16px 0; padding: 16px; border: 1px solid var(--line); border-radius: 8px; }
.custom-editor p { margin: 0 0 12px; }
.custom-rows { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.custom-row { display: flex; flex-wrap: wrap; align-items: end; gap: 8px; padding: 10px; background: #f9fbf7; border-radius: 7px; }
.custom-row strong { align-self: center; width: 25px; font-size: 12px; }
.custom-row label { display: flex; flex-direction: column; gap: 5px; }
.custom-row input { width: 80px; }
.form-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
.button, .print-button { border: 0; border-radius: 7px; padding: 12px 16px; font-size: 12px; font-weight: 700; }
.button-primary, .print-button { background: var(--green); color: white; }
.button-primary:hover, .print-button:hover { background: #285441; }
.status { margin: 0; color: #9c4d2d; font-size: 12px; line-height: 1.5; }
.worksheet { padding: 26px 35px; border-top: 1px solid var(--line); background: #f9fbf7; }
.worksheet-heading { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: end; gap: 15px; }
.answer-toggle { padding: 8px 0; border: 0; background: none; color: var(--green); font-size: 12px; font-weight: 700; }
.triangles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; margin-top: 18px; }
.triangle-card { min-width: 0; padding: 10px; border: 1px solid #e5ebe2; border-radius: 9px; background: white; }
.triangle-number { font-size: 11px; font-weight: 700; color: #8ca398; }
.triangle-svg { display: block; width: 100%; height: auto; }
.triangle-fill { fill: #e5f1e4; stroke: #769788; stroke-width: 2; }
.triangle-circle { fill: #fff; stroke: #587a6b; stroke-width: 2; }
.triangle-value { fill: #253e38; font: 18px "Short Stack", "Segoe UI", sans-serif; text-anchor: middle; dominant-baseline: middle; }
.equation { fill: #253e38; font: 13px "Short Stack", "Segoe UI", sans-serif; text-anchor: middle; }
.answers { margin-top: 20px; padding: 15px; border: 1px solid #dce8da; border-radius: 8px; background: white; font-size: 12px; line-height: 1.7; }
.answers h3 { margin: 0 0 8px; font-size: 13px; }
.answers ol { margin: 0; padding-left: 22px; }
.workspace-footer { padding: 18px 35px; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
.print-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.print-button-secondary { background: #f0f5ed; color: var(--green); border: 1px solid #dce8da; }
.print-button-secondary:hover { background: #dce8da; }
.footer-sparkle, .bottom-note span { color: #d3b07b; }
.print-guide { margin: 0 35px 22px; padding: 12px 15px; border: 1px solid var(--line); border-radius: 8px; color: var(--muted); font-size: 11px; line-height: 1.5; }
.print-guide p { margin: 5px 0 0; }
.bottom-note { padding: 22px; text-align: center; color: #9bab9f; font-size: 11px; }
.site-footer { margin-top: 25px; padding: 30px 5%; background: #f3f4fa; }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 28px; }
.footer-bottom a { color: #57635e; text-decoration: none; font-size: 11px; }
.noscript { padding: 20px; color: #9c4d2d; }
.print-sheet { display: none; }
@media (max-width: 760px) {
  .site-header { padding: 20px; flex-wrap: wrap; gap: 18px; }
  .site-navigation { justify-content: flex-start; gap: 18px; }
  .site-navigation a, .nav-menu summary { font-size: 11px; letter-spacing: 1px; }
  main { padding: 25px 14px 0; }
  .workspace-top { padding: 25px 22px 18px; }
  .mode-switch, #settings-form, .print-guide { margin-left: 22px; margin-right: 22px; }
  .worksheet { padding: 23px 22px; }
  .workspace-footer { padding: 17px 22px; }
  .triangles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .custom-rows { grid-template-columns: 1fr; }
}
@media (max-width: 450px) { .triangles { grid-template-columns: 1fr; } }
@media print {
  @page { size: A4 landscape; margin: 8mm; }
  body { background: white; color: black; }
  .site-header, main, .site-footer, .noscript { display: none !important; }
  .print-sheet { display: block; }
  .print-page { width: 281mm; height: 194mm; break-after: page; page-break-after: always; }
  .print-page:last-child { break-after: auto; page-break-after: auto; }
  .print-layout { display: block; width: 100%; height: 100%; }
  .print-layout .triangle-fill { fill: #e4e9e6; stroke: #333; }
  .print-layout .triangle-circle { fill: white; stroke: #333; }
  .print-layout .triangle-value, .print-layout .print-symbol { fill: black; }
  .print-layout .print-symbol { font: 20px "Short Stack", "Segoe UI", sans-serif; text-anchor: middle; dominant-baseline: middle; }
  .print-layout .print-line { stroke: #222; stroke-width: 1.4; }
  .print-layout .print-footer { font: 11px "Segoe UI", Arial, sans-serif; text-anchor: middle; fill: #222; }
}