:root {
  --navy: #112544;
  --blue: #1f64d1;
  --orange: #ed7d31;
  --ink: #172033;
  --mid: #5d687b;
  --line: #d8e0ea;
  --pale: #f4f7fb;
  --white: #ffffff;
  --green: #14805e;
  --red: #b13a3a;
  --shadow: 0 18px 50px rgba(17, 37, 68, 0.12);
  font-family: Aptos, Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: #eaf0f8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 8%, rgba(31, 100, 209, 0.14), transparent 28rem),
    radial-gradient(circle at 92% 92%, rgba(237, 125, 49, 0.13), transparent 26rem),
    #eaf0f8;
}

button, input { font: inherit; }
button { -webkit-tap-highlight-color: transparent; }

.app-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 24px 0 32px;
}

.course-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 18px;
  color: var(--navy);
}

.course-code, .course-name, .eyebrow, .progress-copy { margin: 0; }
.course-code { font-weight: 900; letter-spacing: 0.08em; }
.course-name { color: var(--mid); font-size: 0.94rem; margin-top: 3px; }
.week-chip { background: var(--navy); color: white; border-radius: 999px; padding: 8px 14px; font-weight: 800; }

.panel {
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 28px;
  box-shadow: var(--shadow);
  padding: clamp(24px, 5vw, 54px);
}

.panel[hidden] { display: none; }

.eyebrow {
  color: var(--blue);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  color: var(--navy);
  font-size: clamp(2.2rem, 6vw, 4.8rem);
  letter-spacing: -0.045em;
  line-height: 0.96;
  margin: 14px 0 18px;
}

h2 { color: var(--navy); margin: 0 0 8px; }
.lede { color: var(--mid); font-size: clamp(1rem, 2.4vw, 1.3rem); line-height: 1.55; max-width: 760px; }

.rules-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 34px 0;
}

.rule-card {
  min-height: 190px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--pale);
}

.rule-number { color: var(--orange); font-weight: 900; letter-spacing: 0.08em; }
.rule-card h2 { margin-top: 22px; font-size: 1.15rem; }
.rule-card p { color: var(--mid); line-height: 1.5; margin-bottom: 0; }

.start-form label, .answer-area label { display: block; color: var(--navy); font-weight: 800; margin-bottom: 9px; }
.start-row { display: grid; grid-template-columns: 1fr auto; gap: 12px; }

input {
  width: 100%;
  min-height: 52px;
  border: 2px solid var(--line);
  border-radius: 14px;
  padding: 12px 15px;
  background: white;
  color: var(--ink);
  outline: none;
}

input:focus { border-color: var(--blue); box-shadow: 0 0 0 4px rgba(31, 100, 209, 0.14); }
.privacy-note, .answer-help { color: var(--mid); font-size: 0.84rem; }

.button {
  min-height: 50px;
  border: 0;
  border-radius: 14px;
  padding: 12px 20px;
  font-weight: 850;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

.button:hover { transform: translateY(-1px); }
.button:focus-visible, .cue-button:focus-visible, .question-dot:focus-visible { outline: 3px solid rgba(31, 100, 209, 0.35); outline-offset: 3px; }
.button-primary { background: var(--blue); color: white; box-shadow: 0 8px 20px rgba(31, 100, 209, 0.22); }
.button-primary:hover { background: #174fa9; }
.button-secondary { background: #e7edf6; color: var(--navy); }
.button:disabled { cursor: not-allowed; opacity: 0.45; transform: none; }

.quiz-topline { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.progress-copy { color: var(--mid); font-weight: 750; margin-top: 7px; }
.timer { color: var(--navy); font-size: clamp(1.55rem, 4vw, 2.4rem); font-variant-numeric: tabular-nums; font-weight: 900; letter-spacing: 0.02em; }
.timer.warning { color: var(--red); }
.progress-track { height: 8px; margin: 18px 0 30px; border-radius: 999px; overflow: hidden; background: #e6ebf3; }
.progress-track span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--blue), var(--orange)); transition: width 180ms ease; }

.question-grid { display: grid; grid-template-columns: minmax(0, 1.12fr) minmax(290px, 0.88fr); gap: clamp(24px, 5vw, 56px); align-items: center; }
.logo-frame { margin: 0; border: 1px solid var(--line); background: var(--pale); border-radius: 24px; padding: clamp(18px, 4vw, 34px); }
.logo-frame img { display: block; width: 100%; aspect-ratio: 360 / 231; object-fit: contain; border-radius: 12px; background: white; }
.logo-frame figcaption { color: var(--mid); text-align: center; font-size: 0.8rem; margin-top: 12px; }
.question-letter { display: grid; place-items: center; width: 48px; height: 48px; margin: 0; border-radius: 50%; background: var(--orange); color: white; font-weight: 900; font-size: 1.2rem; }
.answer-area h1 { font-size: clamp(2rem, 4.5vw, 3.8rem); }

.question-nav { display: grid; grid-template-columns: repeat(12, 1fr); gap: 7px; margin: 30px 0 22px; }
.question-dot { min-width: 0; aspect-ratio: 1; border: 1px solid var(--line); border-radius: 10px; background: white; color: var(--mid); font-size: 0.78rem; font-weight: 900; cursor: pointer; }
.question-dot.answered { background: #e2f4ed; border-color: #aad9c7; color: var(--green); }
.question-dot.current { background: var(--navy); border-color: var(--navy); color: white; }

.button-row { display: flex; justify-content: flex-end; gap: 12px; margin-top: 24px; }
.review-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 28px; }
.review-item { display: flex; justify-content: space-between; gap: 12px; border: 1px solid var(--line); border-radius: 14px; padding: 13px 15px; background: var(--pale); cursor: pointer; color: var(--ink); }
.review-item span:first-child { color: var(--navy); font-weight: 900; }
.review-item .blank { color: var(--red); }
.review-item .complete { color: var(--green); }

.score-lockup { display: flex; align-items: center; gap: 26px; margin: 18px 0 30px; }
.score-lockup h1 { margin-bottom: 10px; }
.score-ring { flex: 0 0 auto; display: grid; place-content: center; width: 138px; height: 138px; border-radius: 50%; background: var(--navy); color: white; font-size: 3.1rem; font-weight: 950; line-height: 1; text-align: center; box-shadow: 0 12px 30px rgba(17, 37, 68, 0.24); }
.score-ring small { display: block; font-size: 0.85rem; margin-top: 6px; }
.result-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.result-item { display: grid; grid-template-columns: 38px 1fr auto; gap: 12px; align-items: center; border: 1px solid var(--line); border-radius: 16px; padding: 14px; }
.result-item.correct { background: #eef8f4; border-color: #b8decf; }
.result-item.incorrect { background: #fff4f2; border-color: #efc7c0; }
.result-letter { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--navy); color: white; font-weight: 900; }
.result-answer strong, .result-answer span { display: block; }
.result-answer span { color: var(--mid); font-size: 0.84rem; margin-top: 3px; }
.result-status { font-weight: 950; font-size: 1.1rem; }
.correct .result-status { color: var(--green); }
.incorrect .result-status { color: var(--red); }

.debrief-box { margin-top: 28px; padding: 24px; border-radius: 22px; background: #f0f5ff; border: 1px solid #cbdaf4; }
.debrief-box h2 { margin-top: 9px; }
.cue-buttons { display: flex; flex-wrap: wrap; gap: 9px; margin: 18px 0; }
.cue-button { border: 1px solid #b9c9e5; border-radius: 999px; padding: 9px 14px; background: white; color: var(--navy); font-weight: 800; cursor: pointer; }
.cue-button[aria-pressed="true"] { border-color: var(--blue); background: var(--blue); color: white; }
.debrief-prompt { color: var(--mid); line-height: 1.55; margin-bottom: 0; }

dialog { width: min(520px, calc(100% - 30px)); border: 0; border-radius: 24px; padding: 0; box-shadow: var(--shadow); }
dialog::backdrop { background: rgba(17, 37, 68, 0.58); backdrop-filter: blur(3px); }
dialog form { padding: 28px; }
dialog h2 { margin-top: 12px; }

footer { color: #667287; font-size: 0.76rem; text-align: center; padding: 22px 10px 0; }
noscript { display: block; margin: 20px; padding: 16px; background: white; color: var(--red); }

@media (max-width: 760px) {
  .app-shell { width: min(100% - 20px, 680px); padding-top: 12px; }
  .course-name { display: none; }
  .panel { border-radius: 22px; }
  .rules-grid, .question-grid, .result-list { grid-template-columns: 1fr; }
  .rule-card { min-height: 0; }
  .start-row { grid-template-columns: 1fr; }
  .question-nav { grid-template-columns: repeat(6, 1fr); }
  .review-grid { grid-template-columns: repeat(2, 1fr); }
  .score-lockup { align-items: flex-start; }
  .score-ring { width: 108px; height: 108px; font-size: 2.5rem; }
}

@media (max-width: 440px) {
  .course-header { padding: 0 3px; }
  .panel { padding: 22px 18px; }
  .score-lockup { display: block; }
  .score-ring { margin-bottom: 20px; }
  .button-row { display: grid; grid-template-columns: 1fr 1fr; }
  .button { padding-inline: 12px; }
}

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