:root {
  color-scheme: dark;
  --ink: #f5f8fb;
  --muted: #9aadc1;
  --dim: #64788f;
  --bg: #050d18;
  --surface: #0a192b;
  --surface-2: #0f2238;
  --line: rgba(156, 184, 211, 0.18);
  --mint: #5ce1c3;
  --mint-strong: #2fc9a8;
  --blue: #6db7ff;
  --amber: #ffca72;
  --red: #ff7a88;
  --shadow: 0 24px 64px rgba(0, 0, 0, 0.34);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { min-height: 100%; background: var(--bg); }

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 0%, rgba(43, 116, 143, 0.19), transparent 31rem),
    linear-gradient(rgba(110, 183, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(110, 183, 255, 0.035) 1px, transparent 1px),
    var(--bg);
  background-size: auto, 42px 42px, 42px 42px, auto;
}

button, input { font: inherit; }

.skip-link {
  position: fixed;
  top: 0;
  left: 1rem;
  z-index: 20;
  padding: .75rem 1rem;
  color: var(--bg);
  background: var(--mint);
  transform: translateY(-120%);
}

.skip-link:focus { transform: translateY(0); }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 76px;
  padding: 0 clamp(1.25rem, 4vw, 4rem);
  border-bottom: 1px solid var(--line);
  background: rgba(5, 13, 24, 0.82);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .8rem;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid rgba(92, 225, 195, .45);
  border-radius: 11px;
  color: var(--mint);
  font-weight: 850;
  box-shadow: inset 0 0 24px rgba(92, 225, 195, .08);
}

.brand strong, .brand small { display: block; }
.brand strong { font-size: .95rem; letter-spacing: .01em; }
.brand small { margin-top: .15rem; color: var(--muted); font-size: .75rem; }

.topbar-meta {
  display: flex;
  align-items: center;
  gap: .5rem;
  color: var(--muted);
  font-size: .82rem;
}

.topbar-button { padding: .35rem .65rem; border: 1px solid var(--line); border-radius: 7px; color: var(--ink); background: transparent; cursor: pointer; }
.topbar-button:hover { border-color: var(--mint); }

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 12px var(--mint);
}

.view { width: min(1180px, calc(100% - 2.5rem)); margin: 0 auto; }
.auth-view { display: grid; min-height: calc(100vh - 76px); place-items: center; padding: 2rem 0; }
.auth-card { width: min(100%, 460px); padding: clamp(1.5rem, 5vw, 2.5rem); border: 1px solid var(--line); border-radius: 20px; background: rgba(7, 21, 38, .94); box-shadow: var(--shadow); }
.auth-card h1 { font-size: clamp(2rem, 8vw, 3.2rem); }
.auth-card > p:not(.eyebrow) { color: var(--muted); line-height: 1.55; }
.auth-card form { display: grid; gap: .7rem; margin-top: 1.5rem; }
.auth-card label { color: var(--muted); font-size: .82rem; font-weight: 700; }
.auth-card input { width: 100%; min-height: 46px; margin-bottom: .4rem; padding: .7rem .8rem; border: 1px solid var(--line); border-radius: 9px; color: var(--ink); background: var(--surface-2); }
.auth-card input:focus { outline: 3px solid rgba(109, 183, 255, .35); border-color: var(--blue); }
.auth-error { margin: 0; color: var(--red) !important; }
.auth-card .button { margin-top: .5rem; }
.dashboard-view { padding: clamp(3rem, 8vw, 7rem) 0 5rem; }

.certification-picker {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  padding: 1rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(10, 25, 43, .78);
}
.certification-picker label { display: block; color: var(--mint); font-size: .875rem; font-weight: 800; }
.certification-picker p { margin: .25rem 0 0; color: var(--muted); font-size: .875rem; }
.certification-picker select { min-width: min(100%, 310px); min-height: 44px; padding: .55rem .75rem; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: var(--surface-2); font: inherit; }
.certification-picker select:focus-visible { outline: 3px solid rgba(109, 183, 255, .45); outline-offset: 2px; }
.app-status { padding: 1rem 1.25rem; border: 1px solid var(--amber); border-radius: 10px; color: var(--amber); }
.import-button { display: inline-flex; align-items: center; cursor: pointer; }

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(280px, .75fr);
  gap: clamp(2.5rem, 8vw, 7rem);
  align-items: center;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--mint);
  font-size: .75rem;
  font-weight: 800;
  letter-spacing: .17em;
}

h1, h2, p { text-wrap: pretty; }

h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(2.7rem, 7.2vw, 5.8rem);
  line-height: .98;
  letter-spacing: -.055em;
}

h1 span { color: var(--mint); font-weight: 420; }

.lede {
  max-width: 650px;
  margin: 1.6rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.65;
}

.actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.actions.centered { justify-content: center; }

.button {
  min-height: 48px;
  padding: .8rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 760;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}

.button:hover { transform: translateY(-2px); }
.button:focus-visible, .answer-button:focus-visible, .icon-button:focus-visible {
  outline: 3px solid rgba(109, 183, 255, .45);
  outline-offset: 3px;
}

.button-primary { color: #03231c; background: var(--mint); }
.button-primary:hover { background: #72edd2; }
.button-exam { color: #061a2c; border-color: rgba(109, 183, 255, .75); background: var(--blue); }
.button-exam:hover { border-color: #8bc7ff; background: #8bc7ff; }
.button-ghost { color: var(--ink); border-color: var(--line); background: transparent; }
.button-ghost:hover { border-color: rgba(92, 225, 195, .6); background: rgba(92, 225, 195, .06); }
.button:disabled { color: var(--dim); border-color: var(--line); background: rgba(255,255,255,.025); cursor: not-allowed; transform: none; }

.progress-panel {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 1.5rem;
  align-items: center;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: linear-gradient(145deg, rgba(15, 34, 56, .86), rgba(7, 21, 38, .92));
  box-shadow: var(--shadow);
}

.ring {
  display: grid;
  width: 150px;
  height: 150px;
  place-items: center;
  border-radius: 50%;
  background: conic-gradient(var(--mint) calc(var(--progress) * 1%), rgba(255,255,255,.07) 0);
}

.ring::before {
  position: absolute;
  width: 122px;
  height: 122px;
  border-radius: 50%;
  background: #0b1c2f;
  content: "";
}

.ring > div { position: relative; z-index: 1; text-align: center; }
.ring strong, .ring span { display: block; }
.ring strong { font-size: 2rem; letter-spacing: -.04em; }
.ring span { color: var(--muted); font-size: .78rem; }

.progress-copy strong, .progress-copy span { display: block; }
.progress-copy > strong { margin: .35rem 0; font-size: 1.65rem; }
.progress-copy > span:last-child { color: var(--muted); font-size: .84rem; line-height: 1.45; }
.progress-copy .review-count { margin-top: .55rem; color: var(--amber); }
.metric-label { color: var(--blue); font-size: .68rem; font-weight: 800; letter-spacing: .12em; }

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  align-items: end;
  margin-top: clamp(4rem, 9vw, 7rem);
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.section-heading h2 { margin: 0; font-size: clamp(1.65rem, 3vw, 2.35rem); letter-spacing: -.025em; }
.section-heading > p { max-width: 360px; margin: 0; color: var(--muted); line-height: 1.55; }

.domain-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; margin-top: 1.25rem; }

.domain-card {
  position: relative;
  display: grid;
  grid-template-columns: 70px 1fr auto;
  gap: 1.25rem;
  align-items: center;
  min-height: 150px;
  padding: 1.5rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(10, 25, 43, .78);
  transition: transform .18s ease, border-color .18s ease;
}

.domain-card:hover { transform: translateY(-3px); border-color: rgba(109, 183, 255, .38); }

.domain-number {
  color: rgba(109, 183, 255, .42);
  font-size: 2.25rem;
  font-weight: 250;
  letter-spacing: -.06em;
}

.domain-card h3 { margin: 0; font-size: 1.06rem; line-height: 1.35; }
.domain-card p { margin: .45rem 0 0; color: var(--muted); font-size: .86rem; }
.domain-action {
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--mint);
  background: rgba(92, 225, 195, .05);
  cursor: pointer;
  font-size: 1.35rem;
}

.domain-progress {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 3px;
  background: rgba(255,255,255,.05);
}

.domain-progress span { display: block; height: 100%; background: var(--mint); }

.prototype-note {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
  padding: 1.35rem 1.5rem;
  border-left: 3px solid var(--amber);
  background: rgba(255, 202, 114, .055);
}

.prototype-note p { margin: 0; color: var(--muted); line-height: 1.55; }

.official-resources { display: flex; justify-content: space-between; align-items: center; gap: 2rem; margin: 2rem 0; padding: clamp(1.4rem, 3vw, 2rem); border: 1px solid rgba(92, 225, 195, .3); border-radius: 18px; background: rgba(92, 225, 195, .055); }
.official-resources h2 { margin: .3rem 0 .7rem; font-size: clamp(1.35rem, 2.8vw, 1.8rem); }
.official-resources p:not(.eyebrow) { max-width: 620px; margin: 0; color: var(--muted); line-height: 1.55; }
.official-resource-links { display: flex; flex-direction: column; align-items: stretch; gap: .65rem; min-width: 245px; }
.official-resource-links .button { text-align: center; white-space: nowrap; }
.resource-help { color: var(--mint); text-align: center; font-size: .82rem; }

.quiz-view { max-width: 900px; padding: 3rem 0 5rem; }
.quiz-shell { border: 1px solid var(--line); border-radius: 22px; background: rgba(7, 21, 38, .92); box-shadow: var(--shadow); }
.quiz-header { display: grid; grid-template-columns: 48px 1fr auto; gap: 1rem; align-items: center; padding: 1.25rem 1.5rem; }
.icon-button { width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 50%; color: var(--muted); background: transparent; cursor: pointer; font-size: 1.55rem; }
.quiz-context span, .quiz-context strong { display: block; }
.quiz-context > span { margin-bottom: .2rem; color: var(--mint); font-size: .72rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.quiz-context strong { font-size: .92rem; }
.quiz-score { text-align: right; }
.quiz-score span, .quiz-score strong { display: block; }
.quiz-score span { color: var(--muted); font-size: .72rem; }
.quiz-score strong { font-size: 1.35rem; }
.quiz-score strong.is-urgent { color: var(--red); }
.progress-track { height: 4px; background: rgba(255,255,255,.05); }
.progress-track span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--blue), var(--mint)); transition: width .25s ease; }

.question-card { padding: clamp(1.5rem, 5vw, 3.5rem); }
.question-meta { display: flex; justify-content: space-between; gap: 1rem; color: var(--dim); font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; }
.question-card h2 { max-width: 720px; margin: 1.25rem 0 2rem; font-size: clamp(1.45rem, 3.8vw, 2.2rem); line-height: 1.25; letter-spacing: -.025em; }
.answer-list { display: grid; gap: .75rem; }

.answer-button {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: .8rem;
  align-items: center;
  width: 100%;
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  text-align: left;
  background: rgba(15, 34, 56, .65);
  cursor: pointer;
  transition: border-color .16s ease, background .16s ease;
}

.answer-button:hover:not(:disabled) { border-color: rgba(109, 183, 255, .55); background: rgba(22, 49, 78, .78); }
.answer-button:disabled { cursor: default; }
.answer-letter { display: grid; width: 30px; height: 30px; place-items: center; border: 1px solid var(--line); border-radius: 8px; color: var(--muted); font-weight: 750; }
.answer-button.correct { border-color: rgba(92, 225, 195, .7); background: rgba(92, 225, 195, .1); }
.answer-button.correct .answer-letter { color: #03231c; border-color: var(--mint); background: var(--mint); }
.answer-button.incorrect { border-color: rgba(255, 122, 136, .7); background: rgba(255, 122, 136, .09); }
.answer-button.incorrect .answer-letter { color: #2b070d; border-color: var(--red); background: var(--red); }
.answer-button.selected { border-color: rgba(109, 183, 255, .8); background: rgba(109, 183, 255, .11); }
.answer-button.selected .answer-letter { color: #061a2c; border-color: var(--blue); background: var(--blue); }

.feedback { margin-top: 1rem; padding: 1rem 1.1rem; border-left: 3px solid var(--mint); background: rgba(92, 225, 195, .06); }
.feedback.is-wrong { border-color: var(--red); background: rgba(255, 122, 136, .06); }
.feedback strong { display: block; margin-bottom: .3rem; }
.feedback p { margin: 0; color: var(--muted); line-height: 1.55; }
.next-button { display: block; margin: 1.25rem 0 0 auto; }

.results-view { max-width: 760px; padding: 4rem 0; }
.result-card { padding: clamp(2rem, 7vw, 4rem); border: 1px solid var(--line); border-radius: 24px; text-align: center; background: rgba(7, 21, 38, .92); box-shadow: var(--shadow); }
.result-gauge { display: grid; width: 150px; height: 150px; margin: 0 auto 1.5rem; place-items: center; border: 1px solid rgba(92, 225, 195, .45); border-radius: 50%; box-shadow: inset 0 0 36px rgba(92, 225, 195, .08); }
.result-gauge strong { font-size: 2.3rem; }
.result-card h1 { font-size: clamp(2rem, 6vw, 3.5rem); }
.result-card > p:not(.eyebrow) { max-width: 540px; margin: 1rem auto 0; color: var(--muted); line-height: 1.6; }
.result-stats { display: grid; grid-template-columns: repeat(2, 1fr); margin: 2rem 0 0; border: 1px solid var(--line); border-radius: 14px; }
.result-stats div { padding: 1.25rem; }
.result-stats div + div { border-left: 1px solid var(--line); }
.result-stats span, .result-stats strong { display: block; }
.result-stats span { color: var(--muted); font-size: .78rem; }
.result-stats strong { margin-top: .35rem; font-size: 1.1rem; }

.result-review {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  text-align: left;
}

.result-review-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; }
.result-review-heading .eyebrow { margin-bottom: .45rem; }
.result-review-heading h2 { margin: 0; font-size: clamp(1.4rem, 3vw, 2rem); }
.result-review-heading > span { color: var(--amber); font-size: .82rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.result-review-list { display: grid; gap: .8rem; margin-top: 1rem; }

.review-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 1rem;
  padding: 1.15rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(15, 34, 56, .58);
}

.review-index { color: var(--amber); font-size: 1.15rem; font-weight: 300; }
.review-item h3 { margin: 0; font-size: 1rem; line-height: 1.45; }
.review-item dl { display: grid; grid-template-columns: repeat(2, 1fr); gap: .65rem; margin: .9rem 0; }
.review-item dl div { padding: .7rem .8rem; border-radius: 9px; background: rgba(92, 225, 195, .055); }
.review-item dt { color: var(--dim); font-size: .7rem; font-weight: 800; text-transform: uppercase; letter-spacing: .07em; }
.review-item dd { margin: .25rem 0 0; color: var(--mint); line-height: 1.4; }
.review-item dd.wrong-answer { color: var(--red); }
.review-item p { margin: 0; color: var(--muted); line-height: 1.55; }
.review-item > div > span { display: block; margin-top: .8rem; color: var(--dim); font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; }

[hidden] { display: none !important; }

@media (max-width: 820px) {
  .intro-grid, .domain-grid { grid-template-columns: 1fr; }
  .progress-panel { max-width: 480px; }
  .section-heading { align-items: start; flex-direction: column; }
  .official-resources { align-items: stretch; flex-direction: column; }
}

@media (max-width: 560px) {
  .certification-picker { align-items: stretch; flex-direction: column; }
  .certification-picker select { width: 100%; }
  .topbar { min-height: 66px; padding: 0 1rem; }
  .topbar-meta { display: none; }
  .view { width: min(100% - 1.4rem, 1180px); }
  .dashboard-view { padding-top: 2.5rem; }
  .progress-panel { grid-template-columns: 110px 1fr; padding: 1rem; }
  .ring { width: 110px; height: 110px; }
  .ring::before { width: 88px; height: 88px; }
  .ring strong { font-size: 1.45rem; }
  .domain-card { grid-template-columns: 48px 1fr auto; gap: .75rem; padding: 1.15rem; }
  .domain-number { font-size: 1.7rem; }
  .prototype-note { grid-template-columns: 1fr; gap: .4rem; }
  .quiz-view { padding-top: 1rem; }
  .quiz-header { padding: 1rem; }
  .question-meta { align-items: start; flex-direction: column; gap: .35rem; }
  .result-stats { grid-template-columns: 1fr; }
  .result-stats div + div { border-top: 1px solid var(--line); border-left: 0; }
  .result-review-heading { align-items: start; flex-direction: column; }
  .review-item { grid-template-columns: 1fr; }
  .review-item dl { grid-template-columns: 1fr; }
}

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