@import url("https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;600;700;800&family=Inter:wght@600;700&display=swap");

:root {
  color-scheme: light;
  --background: #f3f1ea;
  --card: #fcfbf7;
  --ink: #171918;
  --muted: #6f716d;
  --line: #222522;
  --pale-blue: #dce8f0;
  --pale-red: #f0dedc;
  --pale-green: #dfe9df;
  --pale-grey: #e8e7e2;
  --blue: #315e7a;
  --red: #9a4744;
  --green: #496a50;
  --result-card: #151615;
  --result-text: #f7f5ee;
  --result-muted: #bebbb2;
  --result-line: rgba(247, 245, 238, 0.18);
  --result-green: #b9d1b6;
  --result-red: #e5b6b1;
  font-family: "DM Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--background);
  color: var(--ink);
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
}

body {
  margin: 0;
  overflow: hidden;
  background: var(--background);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

button {
  border: 0;
  font: inherit;
  color: inherit;
  cursor: pointer;
  touch-action: manipulation;
}

button:focus-visible,
.quiz-card:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(49, 94, 122, 0.28);
  outline-offset: 3px;
}

button:disabled {
  cursor: wait;
  opacity: 0.62;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.hidden {
  display: none !important;
}

.app-shell {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  width: min(100%, 720px);
  min-width: 0;
  height: 100dvh;
  min-height: 100dvh;
  margin: 0 auto;
  overflow: hidden;
  padding:
    calc(env(safe-area-inset-top) + 14px)
    max(16px, env(safe-area-inset-right))
    calc(env(safe-area-inset-bottom) + 10px)
    max(16px, env(safe-area-inset-left));
  background: var(--background);
}

.app-header {
  display: grid;
  gap: 7px;
  padding-bottom: 6px;
  background: var(--background);
}

.start-mode .app-header,
.final-mode .app-header,
.error-mode .app-header {
  display: none;
}

.eyebrow,
.status-row,
.meta-row,
.info-footer,
.gesture-help,
.source-note {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--muted);
}

.eyebrow {
  margin-bottom: 5px;
  font-size: 0.69rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(2.1rem, 11vw, 4.2rem);
  line-height: 0.96;
  letter-spacing: 0;
}

.status-row,
.meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.progress-track {
  height: 4px;
  overflow: hidden;
  border: 1px solid rgba(23, 25, 24, 0.16);
  border-radius: 999px;
  background: var(--pale-grey);
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--blue);
  transition: width 180ms ease;
}

.app-main {
  display: grid;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  place-items: stretch;
}

.state-card,
.intro-screen,
.quiz-card,
.stack-card {
  border: 1.5px solid var(--line);
  border-radius: 28px;
  background: var(--card);
}

.state-card {
  align-self: center;
  max-height: 100%;
  overflow: auto;
  padding: 24px;
}

.intro-screen {
  align-self: center;
  display: grid;
  align-content: center;
  gap: clamp(14px, 3vh, 22px);
  max-height: 100%;
  overflow: auto;
  padding: clamp(24px, 7vw, 44px);
  background: var(--card);
}

.intro-screen h1 {
  max-width: 10ch;
}

.intro-screen .eyebrow {
  margin-bottom: 0;
}

.method-note {
  max-width: 34rem;
  margin-bottom: 2px;
  color: #343734;
  font-size: clamp(0.96rem, 3.8vw, 1.12rem);
  line-height: 1.48;
}

.intro-screen #start-button {
  width: min(100%, 18rem);
}

.state-card code {
  border-radius: 6px;
  padding: 2px 5px;
  background: var(--pale-grey);
}

.quiz-screen {
  display: grid;
  min-width: 0;
  height: 100%;
  min-height: 0;
  overflow: hidden;
}

.card-stage {
  position: relative;
  display: grid;
  min-width: 0;
  height: 100%;
  min-height: 0;
  overflow: hidden;
  padding: 8px 0 16px;
  perspective: 900px;
}

.stack-card,
.quiz-card {
  grid-area: 1 / 1;
}

.stack-card {
  pointer-events: none;
  box-shadow: none;
}

.stack-card-one {
  transform: translateY(7px) scale(0.986);
  background: #f7f5ef;
}

.stack-card-two {
  transform: translateY(14px) scale(0.972);
  background: #efede6;
}

.stack-card-three {
  transform: translateY(21px) scale(0.958);
  background: #e6e3da;
}

.quiz-card {
  position: relative;
  z-index: 4;
  display: grid;
  min-width: 0;
  height: 100%;
  min-height: 0;
  overflow: hidden;
  touch-action: pan-y;
  transform-origin: 50% 78%;
  transition: transform 180ms ease;
  user-select: none;
}

.quiz-card.dragging {
  cursor: grabbing;
  transition: none;
}

.quiz-card.answered {
  user-select: text;
}

.quiz-card.correct-reveal {
  border-color: var(--result-card);
  background: var(--result-card);
}

.quiz-card.incorrect-reveal {
  border-color: var(--result-card);
  background: var(--result-card);
}

.card-scroll {
  display: grid;
  min-width: 0;
  grid-template-rows: auto minmax(0, 1fr) auto auto;
  height: 100%;
  min-height: 0;
  overflow-y: auto;
  padding: 22px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.quiz-card:not(.answered) .card-scroll {
  overflow: hidden;
}

.quiz-card.answered .card-scroll {
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 18px 18px 0;
  color: var(--result-text);
}

.meta-row {
  color: #595b56;
}

#question {
  align-self: center;
  min-width: 0;
  margin: clamp(18px, 5.5vh, 52px) 0 16px;
  font-size: clamp(1.65rem, 8.4vw, 3.6rem);
  line-height: 1.02;
  letter-spacing: 0;
  overflow-wrap: break-word;
}

.quiz-card.answered .meta-row,
.quiz-card.answered .gesture-help,
.quiz-card.answered .answer-grid {
  display: none;
}

.quiz-card.answered #question {
  flex: 0 0 auto;
  align-self: stretch;
  margin: 0 0 10px;
  color: var(--result-muted);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: clamp(0.68rem, 2.4vw, 0.84rem);
  font-weight: 800;
  letter-spacing: 0.08em;
  line-height: 1.22;
  text-transform: uppercase;
}

.gesture-help {
  max-width: 30rem;
  margin-bottom: 18px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.answer-grid {
  display: grid;
  min-width: 0;
  gap: 12px;
  margin-top: auto;
}

.answer-grid.multi-option,
.answer-grid.two-option {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.option-button,
#start-button,
#next-button,
#restart-button {
  min-height: 62px;
  border: 1.5px solid var(--line);
  border-radius: 18px;
  padding: 14px 16px;
  background: var(--pale-grey);
  font-weight: 800;
  box-shadow: 0 5px 0 rgba(23, 25, 24, 0.16);
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

.option-button:active,
#start-button:active,
#next-button:active,
#restart-button:active {
  transform: translateY(2px);
  box-shadow: 0 3px 0 rgba(23, 25, 24, 0.14);
}

.option-button {
  min-width: 0;
  width: 100%;
  overflow-wrap: break-word;
  text-align: left;
  line-height: 1.22;
}

.answer-grid.multi-option .option-button {
  min-height: clamp(70px, 11vh, 92px);
}

.answer-grid.two-option .option-button {
  min-height: clamp(72px, 12vh, 104px);
  text-align: center;
  text-transform: uppercase;
}

.option-button.correct-option {
  border-color: var(--green);
  background: var(--pale-green);
  color: var(--green);
}

.option-button.wrong-option {
  border-color: var(--red);
  background: var(--pale-red);
  color: var(--red);
}

.option-button.selected-option {
  box-shadow: inset 0 0 0 2px currentColor, 0 5px 0 rgba(23, 25, 24, 0.14);
}

.option-button:disabled {
  cursor: default;
  opacity: 1;
}

.swipe-label {
  position: absolute;
  top: 24px;
  z-index: 5;
  border: 2px solid currentColor;
  border-radius: 14px;
  padding: 7px 12px;
  background: rgba(252, 251, 247, 0.78);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0;
  transition: opacity 100ms ease;
}

.swipe-label-next {
  right: 22px;
  color: var(--blue);
  transform: rotate(8deg);
}

.feedback {
  display: grid;
  flex: 1 1 auto;
  gap: 0;
  min-width: 0;
  min-height: 0;
  margin-top: 0;
  padding-bottom: 0;
}

.answer-summary {
  display: grid;
  min-width: 0;
  gap: 7px;
  border-bottom: 1px solid var(--result-line);
  padding: 0 0 12px;
  color: var(--result-text);
}

.result {
  margin-bottom: 0;
  font-size: clamp(2.8rem, 12.5vw, 5rem);
  line-height: 0.9;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.result.correct {
  color: var(--result-green);
}

.result.incorrect {
  color: var(--result-red);
}

#correct-answer,
#interpretation,
#final-total,
.context-block p {
  color: #343734;
  line-height: 1.55;
}

#selected-answer,
#correct-answer {
  min-width: 0;
  margin-bottom: 0;
  color: var(--result-muted);
  line-height: 1.35;
  overflow-wrap: anywhere;
}

#correct-answer {
  color: var(--result-green);
  font-weight: 800;
}

.incorrect-reveal #selected-answer {
  color: var(--result-red);
}

.quiz-card.answered .context-block h3,
.quiz-card.answered .sources summary {
  color: var(--result-muted);
}

.quiz-card.answered .context-block p,
.quiz-card.answered .sources li {
  color: var(--result-text);
}

.context-block {
  min-width: 0;
  border-top: 1px solid var(--result-line);
  padding: 10px 0;
}

.context-block p,
.sources li,
.modal-body li {
  overflow-wrap: anywhere;
}

.context-block h3,
.final-card h3 {
  margin-bottom: 6px;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.source-note {
  margin-bottom: 0;
  color: var(--result-muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.sources {
  min-width: 0;
  border-top: 1px solid var(--result-line);
  padding: 10px 0 12px;
  color: var(--result-muted);
}

.sources summary {
  cursor: pointer;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.sources ul,
.modal-body ul {
  display: grid;
  gap: 8px;
  margin: 12px 0 0;
  padding-left: 20px;
}

.sources li,
.modal-body li {
  line-height: 1.45;
}

#start-button,
#next-button,
#restart-button {
  width: 100%;
  margin-top: 2px;
  background: var(--pale-blue);
  color: var(--blue);
}

.reveal-actions {
  position: sticky;
  bottom: 0;
  display: grid;
  margin: 0 -18px;
  padding: 12px 18px max(16px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--result-line);
  background: var(--result-card);
  color: var(--result-text);
}

.reveal-actions #next-button {
  margin-top: 0;
  min-height: 62px;
  border-color: var(--result-text);
  background: var(--result-text);
  color: var(--result-card);
  box-shadow: 0 5px 0 rgba(247, 245, 238, 0.24);
  font-size: 1rem;
}

.final-card {
  align-self: stretch;
  margin: 0 0 12px;
}

.final-card h2 {
  margin-bottom: 2px;
  font-size: clamp(3.4rem, 19vw, 6.5rem);
  line-height: 0.95;
  letter-spacing: 0;
}

.breakdown {
  display: grid;
  gap: 8px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.breakdown li {
  border: 1px solid rgba(23, 25, 24, 0.15);
  border-radius: 14px;
  padding: 10px 12px;
  background: #f7f5ef;
  color: #343734;
  line-height: 1.38;
}

.info-footer {
  position: relative;
  padding-top: 9px;
  background: var(--background);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: none;
}

.quiz-mode .info-footer {
  display: none;
}

.info-links button {
  border: 0;
  border-radius: 0;
  padding: 0;
  background: transparent;
  color: #555851;
}

.info-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  min-width: 0;
  max-width: 100%;
  gap: 4px 8px;
}

.info-links button {
  flex: 0 1 auto;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: end center;
  padding:
    calc(env(safe-area-inset-top) + 14px)
    max(14px, env(safe-area-inset-right))
    calc(env(safe-area-inset-bottom) + 14px)
    max(14px, env(safe-area-inset-left));
  background: rgba(23, 25, 24, 0.3);
}

.modal-panel {
  position: relative;
  width: min(100%, 680px);
  max-height: min(78dvh, 760px);
  overflow: auto;
  border: 1.5px solid var(--line);
  border-radius: 28px;
  padding: 24px;
  background: var(--card);
  box-shadow: 0 24px 60px rgba(23, 25, 24, 0.22);
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--pale-grey);
  font-size: 1.4rem;
  line-height: 1;
}

#modal-title {
  padding-right: 42px;
  font-size: 1.45rem;
  line-height: 1.12;
}

.modal-body {
  color: #343734;
  line-height: 1.55;
}

.modal-body p {
  margin-bottom: 13px;
}

.modal-body .source-list {
  max-height: 48dvh;
  overflow: auto;
  border: 1px solid rgba(23, 25, 24, 0.12);
  border-radius: 18px;
  padding: 14px 14px 14px 34px;
  background: #f7f5ef;
}

@media (min-width: 700px) {
  .app-shell {
    padding-inline: 24px;
  }

  .progress-track {
    grid-column: 1 / -1;
  }

  .card-scroll {
    padding: 30px;
  }

  .quiz-card.answered .card-scroll {
    padding: 22px 22px 0;
  }

  .quiz-card.answered .reveal-actions {
    margin-inline: -22px;
    padding-inline: 22px;
  }

  #question {
    margin-top: 10vh;
  }

  .quiz-card.answered #question {
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}