:root {
  --navy-950: #10233f;
  --navy-900: #173154;
  --navy-800: #1d3b67;
  --navy-700: #285385;
  --blue-100: #e9f1fb;
  --blue-50: #f4f8fd;
  --mint-600: #17846d;
  --mint-500: #2ca98e;
  --mint-100: #ddf5ef;
  --red-700: #a42a3a;
  --red-100: #fde8eb;
  --amber-700: #8a5a08;
  --amber-100: #fff3d4;
  --ink: #1c2735;
  --muted: #667386;
  --line: #dce3ec;
  --surface: #ffffff;
  --canvas: #f3f6fa;
  --shadow: 0 18px 52px rgba(23, 49, 84, 0.1);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 11px;
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--canvas);
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--canvas);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 92% 0%, rgba(44, 169, 142, 0.1), transparent 28rem),
    var(--canvas);
}

button,
input {
  font: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

.app-shell {
  min-height: 100vh;
}

.topbar {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 clamp(20px, 4vw, 64px);
  color: #fff;
  background: var(--navy-900);
  box-shadow: 0 8px 28px rgba(16, 35, 63, 0.15);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  font-size: 1.05rem;
  font-weight: 760;
  letter-spacing: -0.015em;
  text-decoration: none;
}

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.11);
}

.brand-mark svg {
  width: 25px;
  height: 25px;
  fill: none;
  stroke: #fff;
  stroke-width: 2.3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.brand-mark path {
  stroke: #64dbc0;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.9rem;
  color: #dbe7f5;
}

.status-divider {
  width: 1px;
  height: 22px;
  background: rgba(255, 255, 255, 0.22);
}

.header-timer {
  min-width: 62px;
  font-variant-numeric: tabular-nums;
  color: #fff;
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.03em;
}

.header-timer.is-urgent {
  color: #ffb7c0;
}

main {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(32px, 6vw, 72px) 0 64px;
  outline: none;
}

.start-layout {
  min-height: calc(100vh - 176px);
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  align-items: center;
  gap: clamp(28px, 5vw, 68px);
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--mint-600);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: break-word;
}

h1 {
  max-width: 780px;
  margin: 0;
  color: var(--navy-950);
  font-size: clamp(2.15rem, 5vw, 4.15rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.lead {
  max-width: 650px;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.7vw, 1.14rem);
  line-height: 1.65;
}

.notice {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  max-width: 620px;
  margin-top: 30px;
  padding: 14px 16px;
  border: 1px solid #cbd9e9;
  border-radius: var(--radius-sm);
  color: #415571;
  background: rgba(255, 255, 255, 0.62);
  line-height: 1.5;
}

.notice svg {
  flex: 0 0 auto;
  width: 21px;
  height: 21px;
  margin-top: 1px;
  fill: none;
  stroke: var(--navy-700);
  stroke-width: 2;
}

.exam-card {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 40px);
  border: 1px solid rgba(23, 49, 84, 0.08);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.exam-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 6px;
  background: linear-gradient(90deg, var(--navy-700), var(--mint-500));
}

.exam-card h2 {
  margin: 4px 0 24px;
  color: var(--navy-950);
  font-size: 1.35rem;
}

.facts {
  display: grid;
  gap: 18px;
  margin: 0 0 30px;
}

.fact {
  display: grid;
  grid-template-columns: 45px 1fr;
  align-items: center;
  gap: 14px;
}

.fact-icon {
  width: 45px;
  height: 45px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  color: var(--navy-700);
  background: var(--blue-100);
}

.fact-icon svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.fact strong,
.fact span {
  display: block;
}

.fact strong {
  margin-bottom: 3px;
  color: var(--navy-950);
  font-size: 0.98rem;
}

.fact span {
  color: var(--muted);
  font-size: 0.88rem;
}

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 0 22px;
  cursor: pointer;
  font-weight: 760;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease, border-color 160ms ease;
}

.button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.button:focus-visible,
.answer-option:has(input:focus-visible),
.question-pill:focus-visible {
  outline: 3px solid rgba(44, 169, 142, 0.35);
  outline-offset: 3px;
}

.button-primary {
  color: #fff;
  background: var(--navy-800);
  box-shadow: 0 10px 24px rgba(29, 59, 103, 0.22);
}

.button-primary:hover:not(:disabled) {
  background: var(--navy-700);
  box-shadow: 0 13px 28px rgba(29, 59, 103, 0.27);
}

.button-secondary {
  color: var(--navy-800);
  border-color: var(--line);
  background: #fff;
}

.button-secondary:hover:not(:disabled) {
  border-color: #aebed1;
  background: var(--blue-50);
}

.button:disabled {
  cursor: not-allowed;
  color: #8e9aab;
  border-color: #e4e8ee;
  background: #e9edf2;
  box-shadow: none;
}

.button-wide {
  width: 100%;
}

.button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.exam-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  align-items: start;
  gap: 28px;
}

.question-panel,
.sidebar,
.result-card,
.review-card {
  border: 1px solid rgba(23, 49, 84, 0.08);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: 0 14px 40px rgba(23, 49, 84, 0.07);
}

.question-panel {
  min-height: 560px;
  display: flex;
  flex-direction: column;
  padding: clamp(24px, 4vw, 46px);
}

.progress-track {
  height: 7px;
  overflow: hidden;
  border-radius: 99px;
  background: #e8edf3;
}

.progress-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--navy-700), var(--mint-500));
  transition: width 240ms ease;
}

.question-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin: 28px 0 18px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 700;
}

.question-panel h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(1.4rem, 2.35vw, 1.9rem);
  line-height: 1.28;
  letter-spacing: -0.025em;
  white-space: pre-line;
}

.topic-label {
  width: fit-content;
  max-width: 100%;
  margin: 0 0 14px;
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--navy-700);
  background: var(--blue-100);
  font-size: 0.82rem;
  font-weight: 800;
  line-height: 1.35;
}

.question-heading {
  margin: 0 0 9px;
  color: var(--mint-600);
  font-size: 0.9rem;
  font-weight: 800;
  line-height: 1.4;
}

.answers {
  display: grid;
  gap: 13px;
  margin: 34px 0 40px;
}

.answer-option {
  min-height: 64px;
  display: grid;
  grid-template-columns: 25px 38px 1fr;
  align-items: center;
  gap: 13px;
  padding: 12px 16px;
  border: 1.5px solid var(--line);
  border-radius: 14px;
  cursor: pointer;
  background: #fff;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.answer-option:hover {
  border-color: #9eb4cc;
  background: var(--blue-50);
  transform: translateY(-1px);
}

.answer-option.is-selected {
  border-color: var(--navy-700);
  background: #eef5fd;
  box-shadow: inset 0 0 0 1px var(--navy-700);
}

.answer-option input {
  width: 20px;
  height: 20px;
  margin: 0;
  accent-color: var(--navy-700);
}

.answer-option input[type="checkbox"] {
  border-radius: 5px;
}

.answer-letter {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: var(--navy-700);
  background: var(--blue-100);
  font-weight: 800;
}

.answer-text {
  color: #29394d;
  font-size: 1rem;
  line-height: 1.45;
}

.question-actions {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-top: auto;
}

.text-answer-wrap {
  display: grid;
  gap: 10px;
  margin: 34px 0 40px;
}

.text-answer-wrap label {
  color: var(--navy-950);
  font-size: 0.9rem;
  font-weight: 800;
}

.text-answer {
  width: 100%;
  min-height: 180px;
  resize: vertical;
  padding: 16px;
  border: 1.5px solid var(--line);
  border-radius: 14px;
  color: var(--ink);
  background: #fff;
  font-size: 1rem;
  line-height: 1.55;
}

.text-answer:focus,
.matrix-row select:focus {
  border-color: var(--navy-700);
  outline: 3px solid rgba(44, 169, 142, 0.25);
  outline-offset: 2px;
}

.matrix-answers {
  display: grid;
  gap: 12px;
  margin: 34px 0 40px;
}

.matrix-row {
  display: grid;
  grid-template-columns: minmax(180px, 1.1fr) minmax(220px, 0.9fr);
  align-items: center;
  gap: 16px;
  padding: 14px 15px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--blue-50);
}

.matrix-row label {
  color: #31445b;
  font-weight: 700;
  line-height: 1.4;
}

.matrix-row select {
  width: 100%;
  min-height: 44px;
  padding: 8px 36px 8px 11px;
  border: 1px solid #becbda;
  border-radius: 9px;
  color: var(--ink);
  background: #fff;
}

.matrix-checkbox-row {
  display: grid;
  grid-template-columns: minmax(180px, 1.1fr) minmax(260px, 1.9fr);
  align-items: start;
  margin: 0;
}

.matrix-checkbox-row legend {
  padding: 3px 12px 0 0;
  color: #31445b;
  font-weight: 700;
  line-height: 1.4;
}

.matrix-checkboxes {
  display: grid;
  gap: 7px;
}

.matrix-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  padding: 8px 10px;
  border: 1px solid #becbda;
  border-radius: 8px;
  cursor: pointer;
  background: #fff;
  line-height: 1.35;
}

.matrix-checkbox.is-selected {
  border-color: var(--navy-700);
  background: #eef5fd;
}

.matrix-checkbox input {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  margin: 1px 0 0;
  accent-color: var(--navy-700);
}

.matrix-text-row {
  align-items: start;
}

.matrix-text-label {
  color: #31445b;
  font-weight: 700;
  line-height: 1.45;
}

.matrix-text-fields {
  display: grid;
  gap: 10px;
}

.matrix-text-row label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.matrix-text-row input {
  width: 100%;
  min-height: 44px;
  padding: 9px 11px;
  border: 1px solid #becbda;
  border-radius: 9px;
  color: var(--ink);
  background: #fff;
  font: inherit;
}

.matrix-text-row input:focus {
  border-color: var(--navy-700);
  outline: 3px solid rgba(44, 169, 142, 0.25);
  outline-offset: 2px;
}

.no-selection-button {
  min-height: 46px;
  padding: 10px 14px;
  border: 1.5px dashed #aebed1;
  border-radius: 12px;
  color: var(--navy-700);
  cursor: pointer;
  background: var(--blue-50);
  font: inherit;
  font-weight: 750;
}

.no-selection-button.is-selected {
  border-style: solid;
  border-color: var(--navy-700);
  background: #eef5fd;
}

.sidebar {
  position: sticky;
  top: 24px;
  padding: 25px;
}

.timer-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 21px;
  border-bottom: 1px solid var(--line);
}

.timer-icon {
  width: 45px;
  height: 45px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--navy-700);
  background: var(--blue-100);
}

.timer-icon svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
}

.timer-label {
  display: block;
  margin-bottom: 2px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.timer-value {
  color: var(--navy-950);
  font-size: 1.45rem;
  font-weight: 850;
  font-variant-numeric: tabular-nums;
}

.timer-card.is-urgent .timer-icon {
  color: var(--red-700);
  background: var(--red-100);
}

.timer-card.is-urgent .timer-value {
  color: var(--red-700);
}

.sidebar-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 22px 0 14px;
}

.sidebar-heading h2 {
  margin: 0;
  color: var(--navy-950);
  font-size: 0.98rem;
}

.sidebar-heading span {
  color: var(--muted);
  font-size: 0.82rem;
}

.question-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.question-pill {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 9px;
  cursor: pointer;
  color: var(--muted);
  background: #fff;
  font-size: 0.78rem;
  font-weight: 800;
}

.question-pill:hover {
  border-color: var(--navy-700);
  color: var(--navy-700);
}

.question-pill.is-current {
  color: #fff;
  border-color: var(--navy-800);
  background: var(--navy-800);
}

.question-pill.is-answered:not(.is-current) {
  color: var(--mint-600);
  border-color: #9ed8cb;
  background: var(--mint-100);
}

.submit-area {
  margin-top: 24px;
}

.submit-hint {
  margin: 11px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.45;
  text-align: center;
}

.results-layout {
  max-width: 920px;
  margin: 0 auto;
}

.result-card {
  display: grid;
  grid-template-columns: 190px 1fr;
  align-items: center;
  gap: clamp(28px, 5vw, 56px);
  padding: clamp(28px, 5vw, 54px);
}

.score-ring {
  --score: 0;
  width: 170px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: conic-gradient(var(--mint-500) calc(var(--score) * 1%), #e6edf4 0);
}

.score-ring::before {
  content: "";
  position: absolute;
}

.score-ring.is-pending {
  background: conic-gradient(var(--navy-700) 10%, #e6edf4 0);
}

.score-inner {
  width: 132px;
  aspect-ratio: 1;
  display: grid;
  place-content: center;
  border-radius: 50%;
  text-align: center;
  background: #fff;
}

.score-value {
  color: var(--navy-950);
  font-size: 2.3rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.05em;
}

.score-label {
  margin-top: 7px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.result-copy .eyebrow {
  margin-bottom: 11px;
}

.result-copy h1 {
  font-size: clamp(1.85rem, 4vw, 2.8rem);
  line-height: 1.03;
}

.result-copy > p:not(.eyebrow) {
  margin: 16px 0 0;
  color: var(--muted);
  line-height: 1.58;
}

.result-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.stat-chip {
  padding: 9px 12px;
  border-radius: 9px;
  color: #3b4c61;
  background: var(--blue-50);
  font-size: 0.86rem;
  font-weight: 700;
}

.stat-chip.correct {
  color: #0f6f5c;
  background: var(--mint-100);
}

.review-section {
  margin-top: 34px;
}

.review-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 17px;
}

.review-header h2 {
  margin: 0;
  color: var(--navy-950);
  font-size: 1.55rem;
  letter-spacing: -0.02em;
}

.review-header p {
  margin: 7px 0 0;
  color: var(--muted);
}

.review-list {
  display: grid;
  gap: 14px;
}

.review-card {
  padding: 22px 24px;
  border-radius: var(--radius-md);
  box-shadow: none;
}

.review-title-row {
  display: flex;
  align-items: flex-start;
  gap: 13px;
}

.review-number {
  flex: 0 0 auto;
  width: 33px;
  height: 33px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  color: var(--navy-700);
  background: var(--blue-100);
  font-size: 0.78rem;
  font-weight: 850;
}

.review-card h3 {
  margin: 5px 0 0;
  color: var(--navy-950);
  font-size: 1rem;
  line-height: 1.45;
  white-space: pre-line;
}

.review-topic {
  margin: 0;
  color: var(--mint-600);
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.35;
}

.review-answer {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 9px;
  margin: 14px 0 0 46px;
  padding: 11px 13px;
  border-radius: 10px;
  color: #45566b;
  background: var(--blue-50);
  line-height: 1.4;
}

.review-answer.correct {
  color: #0f6656;
  background: var(--mint-100);
}

.review-answer.incorrect {
  color: #942537;
  background: var(--red-100);
}

.review-answer.unanswered {
  color: var(--amber-700);
  background: var(--amber-100);
}

.solution-pending {
  margin: 10px 0 0 46px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.answer-indicator {
  font-weight: 900;
}

.review-actions {
  display: flex;
  justify-content: center;
  margin-top: 30px;
}

.dialog-backdrop {
  position: fixed;
  z-index: 20;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(16, 35, 63, 0.58);
  backdrop-filter: blur(6px);
}

.dialog-backdrop[hidden] {
  display: none;
}

.dialog {
  width: min(470px, 100%);
  padding: 34px;
  border-radius: 22px;
  background: #fff;
  box-shadow: 0 28px 80px rgba(16, 35, 63, 0.3);
  text-align: center;
}

.dialog-icon {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  margin: 0 auto 18px;
  border-radius: 50%;
  color: #fff;
  background: var(--mint-500);
  font-size: 1.5rem;
  font-weight: 900;
}

.dialog h2 {
  margin: 0;
  color: var(--navy-950);
  font-size: 1.55rem;
}

.dialog p {
  margin: 13px 0 26px;
  color: var(--muted);
  line-height: 1.55;
}

.dialog-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 11px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 900px) {
  .start-layout,
  .exam-layout {
    grid-template-columns: 1fr;
  }

  .start-layout {
    min-height: auto;
  }

  .sidebar {
    position: static;
    order: -1;
  }

  .sidebar .timer-card {
    padding-bottom: 0;
    border-bottom: 0;
  }

  .sidebar-heading,
  .question-grid,
  .submit-area {
    display: none;
  }

  .result-card {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  .result-stats {
    justify-content: center;
  }
}

@media (max-width: 620px) {
  .topbar {
    height: auto;
    min-height: 68px;
    padding: 12px 18px;
  }

  .brand {
    font-size: 0.95rem;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .header-status {
    gap: 8px;
    font-size: 0;
  }

  .header-status #answeredStatus {
    display: none;
  }

  .status-divider {
    display: none;
  }

  .header-timer {
    min-width: 58px;
    font-size: 0.96rem;
  }

  main {
    width: min(100% - 28px, 1180px);
    padding-top: 28px;
  }

  h1 {
    font-size: clamp(2rem, 11vw, 3.1rem);
  }

  .exam-card,
  .question-panel,
  .sidebar,
  .result-card {
    border-radius: 18px;
  }

  .question-panel {
    min-height: 570px;
    padding: 24px 19px;
  }

  .answer-option {
    grid-template-columns: 23px 1fr;
    gap: 11px;
    padding: 14px;
  }

  .answer-letter {
    display: none;
  }

  .question-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .question-actions .button {
    padding: 0 12px;
  }

  .dialog {
    padding: 28px 20px;
  }

  .dialog-actions {
    grid-template-columns: 1fr;
  }

  .review-header {
    align-items: stretch;
    flex-direction: column;
  }

  .review-header .button {
    width: 100%;
  }

  .review-answer {
    margin-left: 0;
  }

  .solution-pending {
    margin-left: 0;
  }

  .matrix-row {
    grid-template-columns: 1fr;
    gap: 9px;
  }

  .matrix-checkbox-row {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}