:root {
  --bg: #f5f6fa; --panel: #ffffff; --ink: #151827; --muted: #5a6072; --line: #e1e4ee;
  --accent: #3b4cca; --accent-ink: #ffffff; --accent-soft: #eceefe;
  --ok: #157f3b; --ok-soft: #e7f6ec; --warn: #9a5800; --warn-soft: #fff4e0; --bad: #b42318; --bad-soft: #fdecea;
  --bar: #c7cdf6; --gold: #b7791f;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 1px 3px rgba(16, 24, 40, .07);
  --radius: 12px;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --bg: #0e1018; --panel: #171a26; --ink: #e8eaf3; --muted: #9ca3b8; --line: #2a2f40;
  --accent: #9aa6ff; --accent-ink: #10132a; --accent-soft: #232848;
  --ok: #4ade80; --ok-soft: #12301d; --warn: #fbbf24; --warn-soft: #33270b; --bad: #f87171; --bad-soft: #3a1414;
  --bar: #3a4170; --gold: #f6c453;
  --shadow: none;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--ink);
  font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); }
.hidden { display: none !important; }
h2 { font-size: 15px; margin: 0 0 10px; }

.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 20px; border-bottom: 1px solid var(--line); background: var(--panel);
  position: sticky; top: 0; z-index: 5;
}
.brand { display: flex; align-items: center; gap: 8px; min-width: 0; white-space: nowrap; }
.backlink { text-decoration: none; color: var(--muted); }
.backlink:hover { color: var(--ink); }
.sep { color: var(--line); }
.topactions { display: flex; align-items: center; gap: 10px; }
.freebadge { font-size: 12px; color: var(--ok); background: var(--ok-soft); padding: 3px 10px; border-radius: 99px; white-space: nowrap; }

button, input, select, textarea { font: inherit; color: inherit; }
.ghost { background: transparent; border: 1px solid var(--line); color: var(--ink); border-radius: 8px; padding: 7px 12px; cursor: pointer; }
.ghost:hover { border-color: var(--muted); }
.primary { background: var(--accent); color: var(--accent-ink); border: 1px solid var(--accent); border-radius: 8px; padding: 7px 14px; cursor: pointer; font-weight: 600; }
.primary:hover { filter: brightness(1.08); }
.small { padding: 4px 10px; font-size: 13px; }
.linkbtn { background: none; border: 0; padding: 0; color: var(--accent); text-decoration: underline; cursor: pointer; }
button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible, .drop:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}

.wrap { max-width: 1200px; margin: 0 auto; padding: 24px 20px 40px; }
.hero h1 { font-size: clamp(26px, 4vw, 34px); line-height: 1.15; margin: 0 0 6px; letter-spacing: -.01em; }
.lede { color: var(--muted); margin: 0 0 14px; max-width: 660px; }
.examples { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 14px; }
.exlabel { font-size: 13px; color: var(--muted); margin-right: 2px; }
.chip {
  border: 1px solid var(--line); background: var(--panel); color: var(--ink);
  border-radius: 99px; padding: 6px 12px; font-size: 13px; cursor: pointer;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }
.undobar { margin: 0 0 14px; padding: 8px 12px; border-radius: 8px; background: var(--accent-soft); font-size: 14px; }

.grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(320px, 400px); gap: 20px; align-items: start; }
.editor { min-width: 0; display: flex; flex-direction: column; gap: 14px; }
.results { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; }

.field { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.field > span { font-size: 12px; color: var(--muted); font-weight: 600; }
.field.grow { flex: 1 1 220px; }
input[type="text"], input[type="number"], select, textarea {
  border: 1px solid var(--line); background: var(--panel); border-radius: 8px; padding: 7px 9px; min-width: 0; width: 100%;
}
input[type="number"] { -moz-appearance: textfield; }
input[type="number"]::-webkit-inner-spin-button, input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
textarea { resize: vertical; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; }
.setuprow { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; }
.setuprow .field:not(.grow) { flex: 0 1 180px; }
.hint { color: var(--muted); font-size: 13px; margin: 8px 0 0; }
.warn { color: var(--warn); margin: 0; }
details.sub { margin-top: 10px; border-top: 1px dashed var(--line); padding-top: 8px; }
details.sub > summary { cursor: pointer; font-size: 14px; color: var(--accent); }
details.sub[open] > summary { margin-bottom: 8px; }

/* custom scale editor */
.custom { margin-top: 12px; padding-top: 10px; border-top: 1px dashed var(--line); }
.ctable { border-collapse: collapse; width: 100%; margin: 8px 0; }
.ctable th { font-size: 12px; color: var(--muted); text-align: left; font-weight: 600; padding: 2px 4px; }
.ctable td { padding: 3px 4px; }
.ctable td:nth-child(3), .ctable td:nth-child(4) { text-align: center; }
.custom select.small { width: auto; padding: 4px 8px; font-size: 13px; margin-left: 6px; }

/* terms */
.terms { display: flex; flex-direction: column; gap: 14px; }
.term { padding: 14px 16px; }
.termhead { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.termhead .tname { font-weight: 700; font-size: 16px; border-color: transparent; background: transparent; padding-left: 4px; flex: 1 1 0; min-width: 0; }
.termhead .tname:hover, .termhead .tname:focus { border-color: var(--line); background: var(--panel); }
.wfield { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); }
.wfield input { width: 64px; }
.sgpa { white-space: nowrap; font-weight: 700; color: var(--accent); background: var(--accent-soft); border-radius: 99px; padding: 3px 10px; font-size: 13px; font-variant-numeric: tabular-nums; }
.x { background: transparent; border: 1px solid transparent; color: var(--muted); border-radius: 8px; width: 32px; height: 32px; cursor: pointer; font-size: 18px; line-height: 1; flex: none; }
.x:hover { border-color: var(--line); color: var(--bad); }
.crow { display: grid; grid-template-columns: minmax(0, 1fr) 84px 150px 76px 32px; gap: 8px; align-items: center; padding: 3px 0; }
.clabels span { font-size: 12px; color: var(--muted); font-weight: 600; }
.rt { display: flex; align-items: center; gap: 5px; font-size: 13px; color: var(--muted); cursor: pointer; }
.crow.superseded .cname, .crow.superseded .ccred, .crow.superseded .cgrade { text-decoration: line-through; opacity: .6; }
.crow input.bad, .crow select.bad { border-color: var(--bad); background: var(--bad-soft); }
.addc { margin-top: 8px; }
.termactions { display: flex; gap: 10px; flex-wrap: wrap; }

/* summary */
.bigrow { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
.biglabel { font-size: 13px; color: var(--muted); font-weight: 600; }
.big { font-size: 46px; font-weight: 800; line-height: 1.05; letter-spacing: -.02em; font-variant-numeric: tabular-nums; }
.big small { font-size: 18px; font-weight: 600; color: var(--muted); margin-left: 4px; letter-spacing: 0; }
.klass { background: var(--ok-soft); color: var(--ok); font-weight: 700; border-radius: 10px; padding: 6px 10px; font-size: 13px; text-align: right; max-width: 55%; }
.pct { display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--line); }
.pct .field { flex: 0 1 190px; }
.pctval { display: flex; flex-direction: column; min-width: 0; flex: 1 1 150px; }
.pctval b { font-size: 22px; font-variant-numeric: tabular-nums; }
.pctval .hint { margin: 0; font-size: 12px; }
.notes { margin: 12px 0 0; padding: 8px 12px 8px 28px; border-radius: 8px; background: var(--warn-soft); color: var(--warn); font-size: 13px; }

.tablewrap { overflow-x: auto; }
.ttable { width: 100%; border-collapse: collapse; font-size: 14px; }
.ttable th { text-align: left; font-size: 12px; color: var(--muted); font-weight: 600; border-bottom: 1px solid var(--line); padding: 5px 6px; }
.ttable td { padding: 6px; border-bottom: 1px solid var(--line); }
.ttable td.num { font-variant-numeric: tabular-nums; white-space: nowrap; }
.ttable tr.hit td { color: var(--ok); font-weight: 600; }
.gtable { font-size: 13px; }
.chart { margin-top: 12px; }
.chart svg { width: 100%; height: auto; display: block; }
.chart .grid { stroke: var(--line); stroke-width: 1; }
.chart .axis { fill: var(--muted); font-size: 11px; }
.chart .sline { fill: none; stroke: var(--bar); stroke-width: 2; stroke-dasharray: 4 4; }
.chart .sdot { fill: var(--panel); stroke: var(--muted); stroke-width: 2; }
.chart .cline { fill: none; stroke: var(--accent); stroke-width: 2.5; }
.chart .cdot { fill: var(--accent); stroke: var(--panel); stroke-width: 2; }
.legend { display: flex; gap: 14px; font-size: 12px; color: var(--muted); margin-top: 4px; }
.lg::before { content: ""; display: inline-block; width: 12px; height: 10px; margin-right: 5px; border-radius: 2px; vertical-align: -1px; }
.lg.bar::before { width: 10px; height: 10px; border-radius: 50%; border: 2px solid var(--muted); background: transparent; }
.lg.line::before { height: 3px; vertical-align: 3px; background: var(--accent); }

/* tools */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin: -4px 0 12px; overflow-x: auto; }
.tab { background: none; border: 0; border-bottom: 2px solid transparent; padding: 8px 10px; cursor: pointer; color: var(--muted); font-weight: 600; white-space: nowrap; font-size: 14px; }
.tab.on { color: var(--accent); border-bottom-color: var(--accent); }
.planout { margin: 12px 0 8px; }
.planout .planmain { margin: 0; font-size: 15px; }
.planout.ok .planmain b { color: var(--ok); font-size: 18px; }
.planout.no .planmain { color: var(--bad); }
.planout.no .planmain b { font-size: 18px; }
.btnrow { display: flex; flex-wrap: wrap; gap: 8px; }
.drop { margin-top: 12px; border: 2px dashed var(--line); border-radius: 10px; padding: 12px; text-align: center; }
.drop p { margin: 0; }
.drop.over { border-color: var(--accent); background: var(--accent-soft); }
.filelbl { color: var(--accent); text-decoration: underline; cursor: pointer; }
.filelbl input { position: absolute; width: 1px; height: 1px; opacity: 0; overflow: hidden; }
.method summary { cursor: pointer; font-weight: 600; }
.method ul { margin: 10px 0 0; padding-left: 18px; color: var(--muted); font-size: 13px; }
.method li { margin-bottom: 6px; }

.mbar { display: none; }
.foot { text-align: center; color: var(--muted); font-size: 13px; padding: 10px 20px 28px; }
.printsheet { display: none; }

@media (max-width: 920px) {
  .grid { grid-template-columns: minmax(0, 1fr); }
  .mbar {
    display: flex; position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 6; align-items: baseline; gap: 8px;
    background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 12px; padding: 10px 16px;
    box-shadow: 0 6px 20px rgba(0, 0, 0, .25); cursor: pointer; font-size: 14px; text-align: left;
  }
  .mbar.hidden { display: none !important; }
  .mbar b { font-size: 20px; font-variant-numeric: tabular-nums; }
  .mbar #mbarSub { margin-left: auto; opacity: .85; font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .foot { padding-bottom: 80px; }
}
@media (max-width: 600px) {
  .wrap { padding: 16px 16px 32px; }
  .topbar { padding: 8px 16px; }
  .freebadge { display: none; }
  .panel { padding: 14px 12px; }
  .term { padding: 12px; }
  .clabels { display: none; }
  .crow { grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr) auto 32px; row-gap: 6px; padding: 8px 0; border-bottom: 1px solid var(--line); }
  .crow .cname { grid-column: 1 / -1; }
  .rt .rtl { font-size: 12px; }
  .termhead { gap: 6px; }
  .wfield span { display: none; }
  .wfield input { width: 52px; }
  .big { font-size: 40px; }
  .setuprow .field:not(.grow) { flex: 1 1 140px; }
}

@media print {
  body { background: #fff; color: #000; font-size: 12px; }
  .topbar, .wrap, .foot, .mbar { display: none !important; }
  .printsheet { display: block !important; padding: 0; }
  .printsheet h1 { font-size: 20px; margin: 0 0 4px; }
  .printsheet h2 { font-size: 14px; margin: 14px 0 4px; }
  .printsheet .pmeta { color: #444; margin: 0 0 10px; }
  .printsheet .ptop { border: 1px solid #000; padding: 8px 10px; margin-bottom: 8px; }
  .printsheet .pbig { font-size: 18px; font-weight: 700; }
  .printsheet table { width: 100%; border-collapse: collapse; }
  .printsheet th, .printsheet td { border-bottom: 1px solid #bbb; padding: 3px 4px; text-align: left; }
  .printsheet .pfoot { font-weight: 700; margin: 4px 0 0; }
  .pterm { break-inside: avoid; }
}