:root {
  --navy: #0e3b57;
  --navy-dark: #0a2c42;
  --accent: #e2561b;
  --accent-dark: #c04512;
  --bg: #ececec;
  --panel: #d8dfe2;
  --ink: #1b1b1b;
  --green: #1f7a3d;
  --red: #a63d40;
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; }

body {
  font-family: Roboto, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.45;
}

h1, h2 { color: var(--navy); font-weight: 500; margin: 0; }

/* ---------- Intro and code screens ---------- */

.stage { display: flex; justify-content: center; padding: 56px 16px; }

.card {
  background: #fff;
  width: 100%;
  max-width: 780px;
  border-left: 6px solid var(--accent);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

.card-body { padding: 32px 30px 28px; }

.card h1 {
  font-size: 34px;
  padding-bottom: 8px;
  border-bottom: 1px solid #333;
  margin-bottom: 16px;
}

.card p { margin: 0 0 12px; font-size: 15px; }

.info-box {
  background: #eaeaea;
  padding: 18px 20px;
  margin: 18px 0;
}

.info-box h2 { font-size: 22px; margin-bottom: 8px; }

.info-box ul { margin: 8px 0 0; padding-left: 20px; font-size: 15px; }

.card-footer {
  background: var(--panel);
  padding: 14px 20px;
  display: flex;
  justify-content: flex-end;
}

.btn {
  font: inherit;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #fff;
  background: var(--accent);
  border: 0;
  padding: 11px 22px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

.btn:hover { background: var(--accent-dark); }

.btn.secondary { background: var(--navy); }
.btn.secondary:hover { background: var(--navy-dark); }

.step { display: flex; gap: 10px; align-items: flex-start; margin: 26px 0 10px; font-size: 17px; }

.step-num {
  background: var(--navy);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  min-width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 3px;
  margin-top: 1px;
}

.pill {
  background: #eaeaea;
  border-radius: 6px;
  padding: 14px 16px;
  margin: 0 0 6px 34px;
  font-size: 16px;
}

.pill strong { color: var(--navy); text-transform: uppercase; font-size: 13px; letter-spacing: 0.03em; margin-right: 6px; }

.code-row { display: flex; gap: 10px; margin: 0 0 8px 34px; flex-wrap: wrap; }

.code-row input {
  font: inherit;
  font-size: 16px;
  padding: 10px 12px;
  border: 1px solid #555;
  width: 320px;
  max-width: 100%;
}

.error {
  margin: 8px 0 0 34px;
  background: var(--red);
  color: #fff;
  padding: 10px 14px;
  font-size: 14px;
  max-width: 440px;
  display: none;
}

.error.show { display: block; }

.disclaimer {
  background: var(--panel);
  border: 1px solid #c4cdd1;
  margin: 28px 0 0;
  padding: 14px 16px;
  font-size: 12px;
  color: #3d4a50;
  text-align: center;
}

/* ---------- Question screen ---------- */

.topbar {
  background: var(--navy);
  color: #fff;
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  min-height: 44px;
  overflow-x: auto;
}

.topbar-left { display: flex; align-items: stretch; }

.brand {
  padding: 0 18px;
  display: flex;
  align-items: center;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
  border-right: 1px solid rgba(255, 255, 255, 0.15);
}

.tab {
  padding: 0 18px;
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #b9c9d3;
  white-space: nowrap;
  background: none;
  border: 0;
  font-family: inherit;
}

.tab svg { width: 14px; height: 14px; fill: currentColor; }

.tab.active { background: #fff; color: var(--accent); font-weight: 700; border-bottom: 3px solid var(--accent); }

.tab.done { color: #8fd3a4; }

.tab.locked { opacity: 0.8; cursor: not-allowed; }

.toolbar {
  background: #fff;
  border-bottom: 1px solid var(--accent);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 16px;
  gap: 12px;
}

.toolbar .hint { font-size: 13px; color: #4a5960; }

.numbers {
  display: flex;
  justify-content: center;
  gap: 6px;
  padding: 8px 0 6px;
  font-size: 15px;
}

.num {
  font: inherit;
  font-weight: 600;
  color: var(--navy);
  background: none;
  border: 0;
  min-width: 30px;
  padding: 2px 6px;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  position: relative;
}

.num.answered { border-bottom-color: #9bb3c1; }

.num.current { color: var(--accent); font-size: 22px; border-bottom-color: var(--accent); }

.num.flagged::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 7px;
  height: 7px;
  background: #555;
  border-radius: 50%;
}

.qwrap { max-width: 1060px; margin: 0 auto; padding: 0 12px 40px; }

.qcard {
  background: #fff;
  border-left: 6px solid var(--accent);
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.25);
  min-height: 520px;
  padding: 14px 24px 40px;
}

.qhead { display: flex; align-items: center; gap: 8px; }

.arrow {
  background: none;
  border: 0;
  cursor: pointer;
  padding: 6px;
  color: var(--navy);
  display: grid;
  place-items: center;
}

.arrow:disabled { color: #b5b5b5; cursor: default; }

.arrow svg { width: 18px; height: 18px; fill: currentColor; }

.qnum { font-size: 30px; font-weight: 700; color: var(--accent); }

.flag-btn {
  background: none;
  border: 0;
  cursor: pointer;
  padding: 4px;
  color: #9a9a9a;
}

.flag-btn svg { width: 20px; height: 20px; fill: currentColor; }

.flag-btn.on { color: var(--navy); }

.flag-label { font-size: 12px; color: #55646b; }

.qtext { font-size: 17px; margin: 34px 7% 26px; }

.choices { margin: 0 7%; }

.choice {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 14px 10px;
  cursor: pointer;
  font-size: 16px;
  border-radius: 4px;
}

.choice:hover { background: #f3f6f7; }

.choice input { margin-top: 4px; accent-color: var(--navy); }

.modal-back {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-back.show { display: flex; }

.modal {
  background: #fff;
  max-width: 460px;
  width: 100%;
  border-left: 6px solid var(--accent);
  padding: 24px;
}

.modal h2 { font-size: 22px; margin-bottom: 10px; }

.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 20px; flex-wrap: wrap; }

/* ---------- Results ---------- */

.score-big { font-size: 56px; font-weight: 500; color: var(--navy); margin: 6px 0; }

.topic-row { margin: 16px 0; }

.topic-top { display: flex; justify-content: space-between; font-size: 15px; margin-bottom: 4px; }

.bar { background: #e3e8ea; height: 14px; border-radius: 7px; overflow: hidden; }

.bar span { display: block; height: 100%; background: var(--green); }

.bar span.low { background: var(--accent); }

.rec {
  border: 1px solid #c4cdd1;
  padding: 14px 16px;
  margin: 12px 0;
  background: #fafbfb;
}

.rec h3 { margin: 0 0 4px; color: var(--navy); font-size: 17px; }

.rec p { margin: 0 0 10px; font-size: 14px; }

.review-item { border-top: 1px solid #ddd; padding: 14px 0; font-size: 15px; }

.review-item .ok { color: var(--green); font-weight: 600; }

.review-item .bad { color: var(--red); font-weight: 600; }

@media (max-width: 640px) {
  .qtext, .choices { margin-left: 0; margin-right: 0; }
  .card h1 { font-size: 28px; }
  .toolbar .hint { display: none; }
}