:root {
  --portal-ink: #20211f;
  --portal-muted: #686b65;
  --portal-paper: #f5f2ea;
  --portal-surface: #fffdf8;
  --portal-line: #d8d4ca;
  --portal-accent: #b84f31;
  --portal-accent-dark: #8c3822;
  --portal-green: #526d5b;
  --portal-correct: #2f6b45;
  --portal-correct-bg: #e8f3eb;
  --portal-wrong: #a33b31;
  --portal-wrong-bg: #fff0ed;
}

html { scroll-behavior: smooth; }
body { background: var(--portal-paper) !important; color: var(--portal-ink) !important; }
body.portal-ready { padding-top: 82px; }
body.portal-submitted main { opacity: 1; }

.portal-bar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  min-height: 66px;
  display: grid;
  grid-template-columns: minmax(160px, 1fr) minmax(280px, 520px) minmax(220px, 1fr);
  gap: 24px;
  align-items: center;
  padding: 12px max(20px, calc((100vw - 1180px) / 2));
  background: rgba(255, 253, 248, .96);
  border-bottom: 1px solid var(--portal-line);
  backdrop-filter: blur(12px);
}

.portal-brand { color: var(--portal-ink); text-decoration: none; font-size: 13px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.portal-progress { min-width: 0; }
.portal-progress-row { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 7px; color: var(--portal-muted); font-size: 12px; }
.portal-track { height: 7px; overflow: hidden; border-radius: 999px; background: #e6e1d7; }
.portal-fill { width: 0; height: 100%; background: var(--portal-accent); border-radius: inherit; transition: transform .25s ease; transform: scaleX(0); transform-origin: left; }
.portal-actions { justify-self: end; display: flex; gap: 9px; align-items: center; }
.portal-save { color: var(--portal-green); font-size: 12px; font-weight: 700; white-space: nowrap; }
.portal-pdf { min-height: 34px; padding: 0 11px; color: var(--portal-ink); border: 1px solid var(--portal-line); border-radius: 7px; background: white; font: inherit; font-size: 11px; font-weight: 800; cursor: pointer; white-space: nowrap; }
.portal-pdf:hover { border-color: var(--portal-accent); color: var(--portal-accent-dark); }
.portal-pdf:focus-visible { outline: 3px solid var(--portal-ink); outline-offset: 2px; }

body.portal-ready main { max-width: 980px; box-shadow: 0 18px 60px rgba(55, 48, 36, .08) !important; }
body.portal-ready h1 { color: var(--portal-ink) !important; letter-spacing: -.035em; }
body.portal-ready .directions { background: #f1ede3 !important; border-left-color: var(--portal-accent) !important; }
body.portal-ready .question { border-color: var(--portal-line) !important; border-radius: 16px !important; padding: 26px !important; transition: border-color .2s ease, transform .2s ease; }
body.portal-ready .question:focus-within { border-color: var(--portal-accent) !important; transform: translateY(-1px); }
body.portal-ready .badge { color: var(--portal-accent-dark) !important; background: #f8e9e3 !important; border-color: #e4b7a8 !important; }

body.portal-ready .choices { grid-template-columns: 1fr !important; gap: 10px !important; }
body.portal-ready .choice {
  position: relative;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: start;
  padding: 14px 15px !important;
  border: 1px solid #ded9ce !important;
  border-radius: 10px !important;
  background: var(--portal-surface);
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease, transform .15s ease;
}
body.portal-ready .choice:hover { border-color: #b9b1a3 !important; transform: translateY(-1px); }
body.portal-ready .choice.is-selected { border-color: var(--portal-accent) !important; background: #fff4ef; }
body.portal-ready .choice.is-correct,
body.portal-ready .choice.is-correct-answer { border-color: var(--portal-correct) !important; background: var(--portal-correct-bg) !important; box-shadow: inset 4px 0 0 var(--portal-correct); }
body.portal-ready .choice.is-wrong { border-color: var(--portal-wrong) !important; background: var(--portal-wrong-bg) !important; box-shadow: inset 4px 0 0 var(--portal-wrong); }
body.portal-ready .question.question-correct { border-color: #9ec2a8 !important; }
body.portal-ready .question.question-wrong { border-color: #e0aaa2 !important; }
body.portal-ready .choice:has(input:disabled) { cursor: default; transform: none; }
body.portal-ready .choice input { width: 19px; height: 19px; margin: 2px 0 0; accent-color: var(--portal-accent); }
body.portal-ready .choice:has(input:focus-visible) { outline: 3px solid var(--portal-ink); outline-offset: 2px; }
.choice-body { min-width: 0; }
.answer-label { align-self: center; justify-self: end; border-radius: 999px; padding: 4px 8px; background: var(--portal-correct); color: white; font-size: 11px; font-weight: 800; white-space: nowrap; }
.wrong-label { background: var(--portal-wrong); }
.question-result-label { display: inline-flex; margin: 0 0 14px; padding: 6px 9px; border-radius: 7px; color: var(--portal-wrong); background: var(--portal-wrong-bg); font-size: 12px; font-weight: 850; }

.mistake-explanation { margin-top: 20px; border: 1px solid #d8c8a5; border-radius: 11px; background: #fffaf0; overflow: hidden; }
.mistake-explanation summary { padding: 14px 16px; color: #765317; cursor: pointer; font-size: 13px; font-weight: 850; }
.mistake-explanation summary:hover { background: #fff4da; }
.mistake-explanation summary:focus-visible { outline: 3px solid var(--portal-ink); outline-offset: -3px; }
.mistake-explanation-body { display: grid; gap: 11px; padding: 2px 16px 18px; border-top: 1px solid #eadbb9; }
.mistake-explanation-body p { margin: 0; color: #3f403c; font-size: 13px; line-height: 1.6; }
.mistake-method { padding-top: 14px; color: #765317 !important; }
.mistake-diff { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.mistake-diff-line { display: grid; gap: 7px; align-content: start; min-width: 0; padding: 12px; border-radius: 8px; }
.mistake-diff-heading { font-size: 10px; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; }
.mistake-explanation-body .mistake-diff-copy { margin: 0; color: inherit; text-decoration: none; overflow-wrap: anywhere; font-size: 12px; line-height: 1.55; }
.diff-missed { color: #7f332d; background: #fff0ed; }
.diff-required { color: #28593b; background: #e8f3eb; }
.mistake-takeaway { padding: 11px 12px; border-left: 4px solid var(--portal-accent); background: white; }

.reasoning { margin-top: 15px; border-top: 1px solid #e7e2d8; padding-top: 14px; }
.reasoning summary { color: var(--portal-muted); cursor: pointer; font-weight: 700; font-size: 13px; }
.reasoning-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 15px; }
.reasoning-field { display: grid; gap: 6px; }
.reasoning-field:last-child { grid-column: 1 / -1; }
.reasoning-field label { color: var(--portal-muted); font-size: 12px; font-weight: 700; }
.reasoning-field textarea {
  width: 100%; min-height: 76px; resize: vertical; padding: 11px 12px;
  border: 1px solid #d8d2c7; border-radius: 8px; background: white; color: var(--portal-ink);
  font: inherit; font-size: 14px; line-height: 1.45;
}
.reasoning-field textarea:focus-visible { outline: 3px solid var(--portal-ink); outline-offset: 2px; border-color: transparent; }

.portal-submit-zone { max-width: 980px; margin: 26px auto 80px; padding: 30px; background: var(--portal-ink); color: white; border-radius: 18px; }
.portal-submit-zone h2 { margin: 0 0 8px; font-size: 26px; }
.portal-submit-zone p { margin: 0; color: #d2d3cf; }
.portal-submit-row { display: flex; gap: 16px; align-items: center; justify-content: space-between; margin-top: 24px; }
.portal-submit {
  border: 0; border-radius: 9px; padding: 14px 20px; color: white; background: var(--portal-accent);
  font: inherit; font-weight: 800; cursor: pointer; transition: transform .16s ease, background .16s ease;
}
.portal-submit:hover { background: #cf6240; }
.portal-submit:active { transform: scale(.98); }
.portal-submit:focus-visible { outline: 3px solid white; outline-offset: 3px; }
.portal-submit:disabled { cursor: not-allowed; opacity: .55; }
.portal-unanswered { font-size: 13px; color: #d2d3cf; }
.portal-unanswered.has-gaps { color: #ffd3c4; }
body.portal-archived .portal-submit-zone { background: #343733; }
body.portal-archived .portal-track { opacity: .72; }
body.portal-archived .choice { cursor: default; }

.result-kicker { display: block; margin-bottom: 8px; color: #f3b5a2; font-size: 11px; font-weight: 850; letter-spacing: .12em; text-transform: uppercase; }
.result-score { display: flex; align-items: baseline; gap: 14px; margin-bottom: 10px; }
.result-score strong { font-size: clamp(32px, 6vw, 58px); line-height: 1; }
.result-score span { color: #d2d3cf; font-weight: 750; }
#portal-result p { max-width: 660px; color: #d2d3cf; }

.difficulty-panel { max-width: 980px; margin: -52px auto 80px; padding: 30px; border: 1px solid var(--portal-line); border-radius: 18px; background: var(--portal-surface); }
.difficulty-panel[hidden] { display: none; }
.difficulty-panel h2 { margin: 0 0 7px; font-size: clamp(22px, 4vw, 32px); }
.difficulty-panel p { margin: 0; color: var(--portal-muted); }
.difficulty-panel .result-kicker { color: var(--portal-accent); }
.difficulty-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 9px; margin-top: 22px; }
.difficulty-choice { display: flex; gap: 8px; align-items: center; padding: 10px 11px; border: 1px solid var(--portal-line); border-radius: 8px; background: white; cursor: pointer; font-size: 12px; font-weight: 750; }
.difficulty-choice:has(input:checked) { border-color: var(--portal-accent); background: #fff4ef; }
.difficulty-choice input { accent-color: var(--portal-accent); }
.difficulty-status { margin-top: 14px; color: var(--portal-green); font-size: 12px; font-weight: 750; }

.teacher-answer-summary { max-width: 980px; margin: -52px auto 80px; padding: 30px; border: 1px solid #cad8ce; border-radius: 18px; background: #f1f7f2; }
.teacher-answer-summary .result-kicker { color: var(--portal-green); }
.teacher-answer-summary h2 { margin: 0 0 7px; font-size: clamp(22px, 4vw, 32px); }
.teacher-answer-summary p { margin: 0; color: var(--portal-muted); }
.teacher-answer-grid { display: grid; grid-template-columns: repeat(10, minmax(0, 1fr)); gap: 9px; margin-top: 22px; }
.teacher-answer-item { display: grid; gap: 3px; place-items: center; min-width: 0; padding: 10px 6px; border: 1px solid #cad8ce; border-radius: 9px; background: white; }
.teacher-answer-item span { color: var(--portal-muted); font-size: 11px; font-weight: 750; }
.teacher-answer-item strong { color: var(--portal-green); font-size: 20px; line-height: 1; }
.teacher-answer-warning { margin-top: 12px !important; color: #8f2d25 !important; font-weight: 750; }

.portal-message { position: fixed; z-index: 130; right: 22px; bottom: 22px; max-width: 390px; padding: 16px 18px; border-radius: 10px; color: white; background: var(--portal-ink); box-shadow: 0 18px 50px rgba(0, 0, 0, .2); }
.portal-message[hidden] { display: none; }

@media (max-width: 720px) {
  body.portal-ready { padding-top: 104px; }
  .portal-bar { grid-template-columns: 1fr auto; gap: 10px 16px; padding: 12px 16px; }
  .portal-progress { grid-column: 1 / -1; grid-row: 2; }
  .portal-actions { grid-column: 2; grid-row: 1; }
  .portal-save { display: none; }
  body.portal-ready main { margin: 0 !important; padding: 28px 17px 46px !important; }
  body.portal-ready .question { padding: 19px 16px !important; }
  .reasoning-grid { grid-template-columns: 1fr; }
  .mistake-diff { grid-template-columns: 1fr; }
  .reasoning-field:last-child { grid-column: auto; }
  .portal-submit-zone { margin: 18px 12px 42px; padding: 24px 20px; }
  .difficulty-panel { margin: -20px 12px 42px; padding: 24px 20px; }
  .teacher-answer-summary { margin: -20px 12px 42px; padding: 24px 20px; }
  .teacher-answer-grid { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .difficulty-grid { grid-template-columns: repeat(2, 1fr); }
  .portal-submit-row { align-items: stretch; flex-direction: column; }
  .portal-submit { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}

@media print {
  .portal-bar, .portal-submit-zone, .portal-message, .difficulty-panel { display: none !important; }
  body.portal-ready { padding-top: 0; }
  .mistake-explanation { break-inside: avoid; }
  .teacher-answer-summary { break-inside: avoid; margin: 24px auto 0; }
}

/* Extra practice questions are served as text after course access */
.booster-text-question{margin:0 0 14px;font-size:16px;line-height:1.6}
.booster-text-question p{margin:0 0 10px}
.booster-text-question .stem{font-weight:700}
.booster-text-choices .choice-text{margin-left:10px}
.booster-supplement-notice{margin:18px 0 0;padding:14px 16px;border:1px solid #d8c9a0;border-radius:10px;background:#fbf6e8;color:#6b5418;font-weight:600}

/* Class-homework choice lists (2026-10-02): choices of a few words (longest up to 20 characters) sit in one row,
   on screen and in print; longer choices stay one per line. */
body.portal-ready .options.choices-words { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
body.portal-ready .options.choices-words .choice { grid-template-columns: 24px minmax(0, 1fr); margin: 0; }
body.portal-ready .options.choices-words .answer-label { grid-column: 1 / -1; justify-self: start; }
@media screen and (max-width: 600px) {
  body.portal-ready .options.choices-words { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}