/* Math On Board — SAT Math Prep · student area
   Same identity as the course PDFs: indigo, teal and gold; Baloo 2 for headings, Manrope for text.
   The one bold element is "your board": the 19 SAT Math skills on an indigo board, lit by accuracy. */
:root {
  --ink: #1F1D47;
  --muted: #5B6185;
  --paper: #F5F6FB;
  --card: #FFFFFF;
  --line: #DFE2F1;
  --indigo: #5750E0;
  --indigo-deep: #3E38B5;
  --board: #2A2675;
  --indigo-soft: #ECEBFF;
  --teal: #13806E;
  --teal-soft: #DDF4EF;
  --mint: #29C2A6;
  --gold: #FFC94A;
  --gold-soft: #FFF4D6;
  --rose: #C8364F;
  --rose-soft: #FBE3E7;
  --radius-s: 8px;
  --radius-m: 14px;
  --shadow: 0 1px 2px rgba(31, 29, 71, .06), 0 6px 18px rgba(31, 29, 71, .06);
  --head: "Baloo 2", "Manrope", system-ui, sans-serif;
  --text: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
button, input, select, textarea { font-family: inherit; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.55 var(--text); }
h1, h2, h3 { font-family: var(--head); line-height: 1.15; margin: 0 0 .4em; font-weight: 700; }
h1 { font-size: 2.1rem; }
h2 { font-size: 1.55rem; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 .8em; }
a { color: var(--indigo-deep); }
img { max-width: 100%; }
:focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; border-radius: 4px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.muted { color: var(--muted); }
.small { font-size: .875rem; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* ---------- header ---------- */
#top { position: sticky; top: 0; z-index: 20; background: rgba(255, 255, 255, .94); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 16px; padding: 10px 20px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand-logo { height: 40px; width: auto; display: block; }
.brand span { display: flex; flex-direction: column; line-height: 1.05; border-left: 1px solid var(--line); padding-left: 10px; }
.brand b { font-family: var(--head); font-size: 1.15rem; }
.brand small { color: var(--muted); font-size: .78rem; font-weight: 600; }
.top-nav { margin-left: auto; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.top-nav a { text-decoration: none; font-weight: 600; color: var(--muted); }
.top-nav a:hover { color: var(--indigo-deep); }
.who { font-weight: 700; }
.demo-flag { width: 100%; text-align: center; font-size: .8rem; font-weight: 700; color: #7A5600; background: var(--gold-soft);
  border-radius: 6px; padding: 3px; }

/* ---------- buttons and inputs ---------- */
.btn { font: 700 .95rem var(--text); border-radius: 999px; padding: 10px 20px; border: 2px solid transparent; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; text-decoration: none; line-height: 1.2; }
.btn-primary { background: var(--indigo); color: #fff; }
.btn-primary:hover { background: var(--indigo-deep); }
.btn-teal { background: var(--teal); color: #fff; }
.btn-quiet { background: transparent; color: var(--indigo-deep); border-color: var(--line); }
.btn-quiet:hover { border-color: var(--indigo); }
.btn-small { padding: 6px 14px; font-size: .85rem; }
.btn[disabled] { opacity: .55; cursor: default; }
.icon-btn { border: 0; background: transparent; font-size: 1.6rem; line-height: 1; cursor: pointer; color: var(--muted); padding: 2px 8px; }
label { font-weight: 700; font-size: .9rem; display: block; margin: 12px 0 4px; }
input[type=text], input[type=email], input[type=password], select {
  width: 100%; font: 500 1rem var(--text); padding: 11px 14px; border: 2px solid var(--line); border-radius: var(--radius-s); background: #fff; color: var(--ink); }
input:focus, select:focus { border-color: var(--indigo); outline: none; }
.form-note { font-size: .85rem; color: var(--muted); margin-top: 8px; }
.error { color: var(--rose); font-weight: 600; font-size: .9rem; margin-top: 8px; }

/* ---------- generic blocks ---------- */
main { padding: 28px 0 70px; }
.section { margin-top: 44px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.section-head p { margin: 0; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-m); padding: 22px; }
.center-card { max-width: 460px; margin: 48px auto; }
.center-card h1 { font-size: 1.8rem; }
.divider { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: .85rem; margin: 18px 0 4px; }
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.google { width: 100%; background: #fff; border-color: var(--line); color: var(--ink); }
.link-btn { background: none; border: 0; color: var(--indigo-deep); font: 600 .9rem var(--text); cursor: pointer; padding: 0; text-decoration: underline; }
.spinner { width: 22px; height: 22px; border: 3px solid var(--indigo-soft); border-top-color: var(--indigo); border-radius: 50%; animation: spin .8s linear infinite; display: inline-block; vertical-align: middle; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading { padding: 60px 0; text-align: center; color: var(--muted); }

/* ---------- dashboard: hello + next step ---------- */
.hello { display: grid; grid-template-columns: 1fr auto; gap: 18px; align-items: end; }
.hello h1 { font-size: 2.4rem; margin-bottom: .1em; }
.hello p { margin: 0; color: var(--muted); font-size: 1.05rem; max-width: 60ch; }

/* ---------- the board ---------- */
.board { margin-top: 22px; background: var(--board); color: #fff; border-radius: 20px; padding: 22px 22px 18px;
  box-shadow: inset 0 0 0 6px #232065, var(--shadow); }
.board-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.board-head h2 { color: #fff; margin: 0; }
.board-head p { margin: 0; color: #C9C7F5; font-size: .9rem; }
.board-cols { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.board-col h3 { font-size: 1rem; color: var(--gold); margin: 0 0 8px; font-weight: 700; }
.tile { display: flex; justify-content: space-between; align-items: center; gap: 8px; border-radius: 10px; padding: 8px 10px;
  margin-bottom: 7px; font-size: .82rem; font-weight: 600; line-height: 1.25; min-height: 46px; }
.tile b { font-family: var(--head); font-size: 1.05rem; white-space: nowrap; }
.tile.none { border: 1.5px dashed rgba(255, 255, 255, .28); color: #B9B6EE; }
.tile.review { background: #E5566E; color: #fff; }
.tile.developing { background: var(--gold); color: #3A2A00; }
.tile.proficient { background: #8FE3D2; color: #08352D; }
.tile.strong { background: var(--mint); color: #062C25; }
.legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 10px; font-size: .78rem; color: #C9C7F5; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }

/* ---------- tests ---------- */
.tests { display: grid; gap: 10px; }
.test-row { display: grid; grid-template-columns: 1.4fr 1fr auto; gap: 16px; align-items: center; background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius-m); padding: 14px 18px; }
.test-row h3 { margin: 0; font-size: 1.1rem; }
.test-row .meta { color: var(--muted); font-size: .85rem; }
.test-row .last { font-size: .9rem; }
.test-row .last b { font-family: var(--head); font-size: 1.25rem; }
.test-row .acts { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.test-row { border-left: 5px solid var(--line); }
.test-row.done { border-left-color: var(--mint); }
.history { grid-column: 1 / -1; display: flex; gap: 8px; flex-wrap: wrap; margin-top: -4px; }
.history a { font-size: .8rem; text-decoration: none; border: 1px solid var(--line); border-radius: 999px; padding: 2px 10px; color: var(--muted); }
.history a:hover { border-color: var(--indigo); color: var(--indigo-deep); }
.trend { margin-top: 14px; }
.trend svg { width: 100%; height: 150px; display: block; }

/* ---------- course ---------- */
.course-group { margin-bottom: 18px; }
.course-group > h3 { margin: 0 0 8px; }
details.part { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-m); margin-bottom: 8px; }
details.part > summary { list-style: none; cursor: pointer; display: grid; grid-template-columns: 1fr auto auto; gap: 12px; align-items: center; padding: 12px 16px; }
details.part > summary::-webkit-details-marker { display: none; }
details.part > summary .t { font-weight: 700; }
details.part[open] > summary { border-bottom: 1px solid var(--line); }
.meter { width: 120px; height: 8px; background: var(--indigo-soft); border-radius: 99px; overflow: hidden; }
.meter i { display: block; height: 100%; background: var(--teal); }
.count { font-size: .8rem; color: var(--muted); white-space: nowrap; }
.lessons { list-style: none; margin: 0; padding: 6px 16px 12px; }
.lessons li { display: flex; align-items: center; gap: 10px; padding: 7px 0; border-bottom: 1px dashed var(--line); }
.lessons li:last-child { border-bottom: 0; }
.lessons input[type=checkbox] { width: 20px; height: 20px; accent-color: var(--teal); flex: none; }
.lessons .code { font-weight: 800; color: var(--indigo-deep); width: 48px; flex: none; }
.lessons .lt { flex: 1; }
.lessons .soon { font-size: .78rem; color: var(--muted); }
.part-actions { display: flex; gap: 8px; padding: 12px 16px 0; flex-wrap: wrap; }
.video-frame { position: relative; padding-top: 56.25%; }
.video-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; border-radius: 10px; }

/* ---------- test runner ---------- */
body.runner { background: #fff; }
.run-bar { position: sticky; top: 0; z-index: 10; background: #fff; border-bottom: 1px solid var(--line); display: grid;
  grid-template-columns: 1fr auto 1fr; align-items: center; gap: 12px; padding: 10px 20px; }
.run-bar .title { font-weight: 800; }
.run-bar .title small { display: block; color: var(--muted); font-weight: 600; }
.timer { font: 800 1.35rem var(--head); text-align: center; min-width: 96px; }
.timer.low { color: var(--rose); }
.timer button { display: block; margin: 0 auto; font-size: .72rem; }
.run-tools { display: flex; gap: 8px; justify-content: flex-end; flex-wrap: wrap; }
.q-area { max-width: 780px; margin: 0 auto; padding: 26px 20px 140px; }
.q-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; border-bottom: 2px solid var(--ink);
  padding-bottom: 8px; margin-bottom: 18px; }
.q-num { font: 800 1.05rem var(--head); background: var(--ink); color: #fff; border-radius: 6px; padding: 2px 10px; }
.mark { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; font-size: .9rem; cursor: pointer; background: none; border: 0; color: var(--ink); }
.mark .flag { width: 18px; height: 18px; }
.mark[aria-pressed=true] .flag path { fill: var(--gold); stroke: #A77600; }
.stem { font-size: 1.07rem; }
.stem table, .solution table { border-collapse: collapse; margin: 10px 0; font-size: .95rem; }
.stem th, .stem td, .solution th, .solution td { border: 1px solid var(--line); padding: 6px 10px; text-align: center; }
.stem th, .solution th { background: var(--paper); }
.figure { margin: 12px 0; text-align: center; }
.figure img { max-height: 340px; }
.choices { display: grid; gap: 10px; margin-top: 16px; }
.choice { display: grid; grid-template-columns: 1fr auto; gap: 6px; align-items: stretch; }
.choice .pick { display: flex; align-items: center; gap: 14px; text-align: left; font: 500 1rem var(--text); color: var(--ink);
  background: #fff; border: 2px solid var(--line); border-radius: 12px; padding: 12px 14px; cursor: pointer; width: 100%; }
.choice .pick:hover { border-color: var(--indigo); }
.choice .letter { flex: none; width: 30px; height: 30px; border-radius: 50%; border: 2px solid var(--ink); display: grid; place-items: center; font-weight: 800; }
.choice.on .pick { border-color: var(--indigo); background: var(--indigo-soft); box-shadow: 0 0 0 1px var(--indigo); }
.choice.on .letter { background: var(--indigo); border-color: var(--indigo); color: #fff; }
.choice.out .pick { opacity: .5; }
.choice.out .pick .ctext { text-decoration: line-through; }
.cross { border: 1px solid var(--line); background: #fff; border-radius: 10px; padding: 0 10px; cursor: pointer; color: var(--muted); font-size: .78rem; font-weight: 700; }
.cross[aria-pressed=true] { background: var(--ink); color: #fff; border-color: var(--ink); }
.spr { margin-top: 16px; display: grid; grid-template-columns: minmax(0, 220px) 1fr; gap: 18px; align-items: start; }
.spr input { font: 700 1.3rem var(--text); letter-spacing: .04em; }
.spr .preview { min-height: 48px; font-size: 1.3rem; padding-top: 8px; }
.spr .rules { grid-column: 1 / -1; font-size: .85rem; color: var(--muted); background: var(--paper); border-radius: 10px; padding: 10px 14px; }
.spr .rules ul { margin: 0; padding-left: 18px; }
.run-foot { position: fixed; bottom: 0; left: 0; right: 0; background: #fff; border-top: 1px solid var(--line); display: grid;
  grid-template-columns: 1fr auto 1fr; align-items: center; gap: 10px; padding: 12px 20px; z-index: 10; }
.run-foot .right { display: flex; justify-content: flex-end; gap: 8px; }
.navgrid-btn { font: 800 .95rem var(--text); background: var(--ink); color: #fff; border: 0; border-radius: 999px; padding: 9px 18px; cursor: pointer; }
.navgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(44px, 1fr)); gap: 8px; }
.navgrid button { position: relative; height: 44px; border-radius: 8px; border: 2px dashed #9AA0C4; background: #fff; font: 800 .95rem var(--text); cursor: pointer; color: var(--ink); }
.navgrid button.answered { border: 2px solid var(--indigo); background: var(--indigo-soft); }
.navgrid button.current { outline: 3px solid var(--ink); outline-offset: 1px; }
.navgrid button.marked::after { content: ""; position: absolute; top: -6px; right: -6px; width: 14px; height: 14px; border-radius: 50%; background: var(--gold); border: 2px solid #fff; }
.nav-legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: .8rem; color: var(--muted); margin-bottom: 12px; }
.intro { max-width: 680px; margin: 40px auto; padding: 0 20px; }
.intro ul { padding-left: 20px; }
.ref table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.ref td, .ref th { border-bottom: 1px solid var(--line); padding: 8px 6px; text-align: left; vertical-align: top; }

/* ---------- results ---------- */
.score-hero { display: grid; grid-template-columns: auto 1fr; gap: 28px; align-items: center; }
.score-ring { width: 150px; height: 150px; }
.score-hero h1 { margin-bottom: 4px; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 10px; }
.chip { background: var(--paper); border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; font-size: .85rem; font-weight: 700; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.bars { display: grid; gap: 12px; }
.bar-row { display: grid; grid-template-columns: 1fr auto; gap: 4px 10px; font-size: .92rem; }
.bar-row .track { grid-column: 1 / -1; height: 10px; background: var(--indigo-soft); border-radius: 99px; overflow: hidden; }
.bar-row .track i { display: block; height: 100%; border-radius: 99px; }
.bar-row .track i.strong { background: var(--teal); }
.bar-row .track i.proficient { background: var(--mint); }
.bar-row .track i.developing { background: var(--gold); }
.bar-row .track i.review { background: var(--rose); }
.band { font-size: .78rem; font-weight: 700; color: var(--muted); }
.fine { font-size: .78rem; color: var(--muted); margin-top: 12px; }
.skills-list { list-style: none; margin: 0; padding: 0; }
.more-skills summary { cursor: pointer; font-weight: 700; color: var(--indigo-deep); font-size: .9rem; margin-top: 10px; }
.skills-list li { display: flex; justify-content: space-between; gap: 10px; padding: 7px 0; border-bottom: 1px dashed var(--line); font-size: .9rem; }
.tutor { border: 2px solid var(--indigo); background: linear-gradient(180deg, var(--indigo-soft), #fff 120px); }
.tutor-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.tutor-head h2 { margin: 0; }
.tutor-controls { margin-left: auto; display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.tutor-controls select { width: auto; padding: 8px 10px; }
.report { margin-top: 12px; }
.report h3 { margin-top: 18px; color: var(--indigo-deep); }
.report ul, .report ol { padding-left: 22px; }
.filters { display: flex; gap: 8px; }
.filters button[aria-pressed=true] { background: var(--ink); color: #fff; border-color: var(--ink); }
.qcard { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-m); margin-bottom: 10px; }
.qcard > summary { cursor: pointer; list-style: none; display: grid; grid-template-columns: auto 1fr auto; gap: 12px; align-items: center; padding: 12px 16px; }
.qcard > summary::-webkit-details-marker { display: none; }
.qcard[open] > summary { border-bottom: 1px solid var(--line); }
.res { font-weight: 800; font-size: .8rem; border-radius: 999px; padding: 3px 10px; white-space: nowrap; }
.res.ok { background: var(--teal-soft); color: var(--teal); }
.res.no { background: var(--rose-soft); color: var(--rose); }
.res.blank { background: var(--paper); color: var(--muted); }
.qbody { padding: 14px 18px 18px; }
.answers-line { display: flex; gap: 18px; flex-wrap: wrap; font-weight: 700; margin: 10px 0; }
.choice-review { display: grid; gap: 6px; margin: 10px 0; }
.choice-review div { border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; }
.choice-review .is-key { border-color: var(--teal); background: var(--teal-soft); }
.choice-review .is-wrong { border-color: var(--rose); background: var(--rose-soft); }
.solution { background: var(--paper); border-radius: 12px; padding: 12px 16px; margin-top: 10px; }
.solution h4 { margin: 0 0 6px; font-size: .95rem; }
.solution ul { padding-left: 20px; margin: 6px 0; }

/* ---------- modal and toast ---------- */
.modal-wrap { position: fixed; inset: 0; background: rgba(20, 18, 50, .45); display: grid; place-items: center; z-index: 50; padding: 16px; }
.modal { background: #fff; border-radius: 16px; width: min(640px, 100%); max-height: 88vh; display: flex; flex-direction: column; box-shadow: 0 20px 60px rgba(0, 0, 0, .25); }
.modal-head { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px 8px; }
.modal-head h2 { margin: 0; font-size: 1.35rem; }
.modal-body { padding: 4px 20px 12px; overflow: auto; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; padding: 12px 20px 16px; border-top: 1px solid var(--line); }
.toast { position: fixed; left: 50%; bottom: 90px; transform: translate(-50%, 30px); opacity: 0; background: var(--ink); color: #fff;
  padding: 10px 18px; border-radius: 999px; font-weight: 600; z-index: 60; transition: .25s; pointer-events: none; max-width: 90vw; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.bad { background: var(--rose); }

footer.site { border-top: 1px solid var(--line); padding: 22px 20px 40px; font-size: .78rem; color: var(--muted); text-align: center; }

/* ---------- small screens ---------- */
@media (max-width: 860px) {
  .board-cols { grid-template-columns: 1fr 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .test-row { grid-template-columns: 1fr; }
  .test-row .acts { justify-content: flex-start; }
}
@media (max-width: 560px) {
  h1, .hello h1 { font-size: 1.8rem; }
  .hello { grid-template-columns: 1fr; }
  .board { padding: 16px; }
  .board-cols { grid-template-columns: 1fr; }
  .run-bar { grid-template-columns: 1fr auto; }
  .run-tools { grid-column: 1 / -1; justify-content: flex-start; }
  .run-foot { grid-template-columns: auto 1fr auto; padding: 10px 12px; }
  .spr { grid-template-columns: 1fr; }
  .score-hero { grid-template-columns: 1fr; }
  details.part > summary { grid-template-columns: 1fr auto; }
  details.part > summary .meter { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}