:root {
  color-scheme: light;
  --canvas: #f0eee8;
  --paper: #fffdf8;
  --paper-deep: #f8f4eb;
  --ink: #1d2824;
  --muted: #66726d;
  --rail: #173b35;
  --rail-light: #214a42;
  --rail-ink: #fbf7ed;
  --accent: #ce6b3c;
  --accent-dark: #9f4825;
  --accent-soft: #fff0e7;
  --good: #267455;
  --good-soft: #eaf6ef;
  --bad: #ad493f;
  --bad-soft: #fff0ec;
  --hairline: rgba(45, 59, 53, 0.13);
  --hairline-strong: rgba(45, 59, 53, 0.22);
  --rail-line: rgba(255, 255, 255, 0.13);
  --serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --sans: "Aptos", "Segoe UI Variable Text", "Segoe UI", ui-sans-serif, sans-serif;
  --motion: cubic-bezier(0.32, 0.72, 0, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 9%, rgba(206, 107, 60, 0.14), transparent 29rem),
    radial-gradient(circle at 94% 88%, rgba(31, 93, 78, 0.12), transparent 31rem),
    var(--canvas);
  font-family: var(--sans);
  font-size: 16px;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  z-index: 0;
  inset: 0;
  pointer-events: none;
  content: "";
  opacity: 0.28;
  background-image: radial-gradient(rgba(29, 40, 36, 0.2) 0.55px, transparent 0.55px);
  background-size: 8px 8px;
  mask-image: linear-gradient(to bottom, black, transparent 78%);
}

button {
  font: inherit;
}

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

h1,
h2,
p,
figure {
  margin: 0;
}

.app-shell {
  position: relative;
  z-index: 1;
  width: min(100%, 1232px);
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0 auto;
  padding: clamp(20px, 4vw, 52px) clamp(16px, 3vw, 38px);
  display: grid;
  place-items: center;
}

.quiz-frame {
  width: 100%;
  padding: 7px;
  border: 1px solid rgba(37, 51, 45, 0.1);
  border-radius: 36px;
  background: rgba(255, 253, 248, 0.5);
  box-shadow:
    0 30px 80px rgba(51, 43, 32, 0.13),
    0 2px 5px rgba(51, 43, 32, 0.04),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  animation: shell-enter 900ms var(--motion) both;
}

.quiz-panel {
  width: 100%;
  min-height: min(780px, calc(100dvh - 70px));
  display: grid;
  grid-template-columns: minmax(252px, 294px) minmax(0, 1fr);
  overflow: hidden;
  border-radius: 29px;
  background: var(--paper);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.8);
}

.topbar {
  min-width: 0;
  padding: 34px 28px 28px;
  display: flex;
  flex-direction: column;
  color: var(--rail-ink);
  background:
    radial-gradient(circle at 14% 4%, rgba(255, 202, 156, 0.13), transparent 18rem),
    linear-gradient(158deg, var(--rail-light), var(--rail) 64%);
}

.brand {
  min-width: 0;
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.brand-mark {
  position: relative;
  flex: 0 0 auto;
  width: 52px;
  height: 52px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 17px;
  background: rgba(255, 255, 255, 0.07);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.14),
    0 16px 35px rgba(3, 20, 16, 0.15);
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  left: 14px;
  right: 14px;
  height: 1px;
  content: "";
  background: #efaa77;
  transform-origin: center;
}

.brand-mark::before {
  top: 19px;
  transform: rotate(32deg);
}

.brand-mark::after {
  top: 31px;
  transform: rotate(-32deg);
}

.brand-mark span {
  position: absolute;
  z-index: 1;
  width: 10px;
  height: 10px;
  border: 1px solid #f3b68b;
  border-radius: 50%;
  background: var(--rail);
  box-shadow: 0 0 0 3px rgba(239, 170, 119, 0.08);
}

.brand-mark span:nth-child(1) {
  top: 10px;
  left: 10px;
}

.brand-mark span:nth-child(2) {
  top: 21px;
  right: 9px;
}

.brand-mark span:nth-child(3) {
  bottom: 9px;
  left: 14px;
}

.brand-copy {
  min-width: 0;
}

.eyebrow {
  margin-bottom: 7px;
  color: #efb58e;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  line-height: 1;
  text-transform: uppercase;
}

h1 {
  max-width: 180px;
  font-family: var(--serif);
  font-size: clamp(1.65rem, 2.4vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.02;
}

.brand p:last-child {
  margin-top: 11px;
  color: rgba(251, 247, 237, 0.66);
  font-size: 0.85rem;
  line-height: 1.55;
}

.score-card {
  margin-top: 48px;
  padding: 18px 18px 17px;
  border: 1px solid var(--rail-line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.065);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.09),
    0 20px 45px rgba(3, 20, 16, 0.11);
}

.score-label {
  display: block;
  color: rgba(251, 247, 237, 0.58);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.score-pill {
  margin-top: 7px;
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: rgba(251, 247, 237, 0.64);
  font-family: var(--serif);
  font-size: 1.5rem;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

#score-value {
  color: #ffc498;
  font-size: 2.55rem;
  font-weight: 600;
  letter-spacing: -0.05em;
}

.score-divider {
  color: rgba(251, 247, 237, 0.22);
}

#answered-value {
  font-weight: 550;
}

.study-note {
  margin-top: auto;
  padding-top: 40px;
  display: grid;
  grid-template-columns: 31px 1fr;
  gap: 12px;
  color: rgba(251, 247, 237, 0.55);
  font-size: 0.77rem;
  line-height: 1.55;
}

.study-note-index {
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  color: #efb58e;
  font-size: 0.66rem;
  font-variant-numeric: tabular-nums;
}

.quiz-stage {
  min-width: 0;
  display: flex;
  flex-direction: column;
  background:
    radial-gradient(circle at 100% 0, rgba(206, 107, 60, 0.055), transparent 24rem),
    var(--paper);
}

.progress-region {
  padding: 23px clamp(28px, 4vw, 48px) 0;
}

.progress-copy {
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 650;
  letter-spacing: 0.07em;
  line-height: 1.2;
  text-transform: uppercase;
}

.progress-copy span:last-child {
  color: rgba(102, 114, 109, 0.62);
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: none;
}

.progress-wrap {
  height: 7px;
  overflow: hidden;
  border-radius: 999px;
  background: #e9e5db;
  box-shadow: inset 0 1px 2px rgba(45, 59, 53, 0.08);
}

.progress-bar {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), #e89d69 60%, #eeb487);
  box-shadow: 0 0 18px rgba(206, 107, 60, 0.24);
  transition: width 650ms var(--motion);
}

.question-view,
.finish-view {
  flex: 1;
  min-width: 0;
  padding: 29px clamp(28px, 4vw, 48px) 38px;
}

.question-view {
  display: flex;
  flex-direction: column;
  animation: content-enter 700ms var(--motion) 80ms both;
}

.question-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 650;
  line-height: 1.35;
}

#question-counter,
#question-source {
  display: inline-flex;
  align-items: center;
  min-height: 29px;
  padding: 5px 11px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: rgba(248, 244, 235, 0.76);
}

#question-counter {
  flex: 0 0 auto;
  color: var(--accent-dark);
  font-variant-numeric: tabular-nums;
}

#question-source {
  max-width: min(64%, 520px);
  justify-content: flex-end;
  overflow: hidden;
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#question-text {
  max-width: 920px;
  margin-top: 22px;
  font-family: var(--serif);
  font-size: clamp(1.42rem, 2.2vw, 1.8rem);
  font-weight: 600;
  letter-spacing: -0.026em;
  line-height: 1.35;
  text-wrap: pretty;
}

#question-text:focus {
  outline: none;
}

.question-media {
  width: 100%;
  max-width: 820px;
  margin: 24px auto 0;
  padding: 6px;
  border: 1px solid var(--hairline);
  border-radius: 25px;
  background: #eee9df;
  box-shadow:
    0 18px 45px rgba(51, 43, 32, 0.09),
    inset 0 1px 0 rgba(255, 255, 255, 0.72);
  animation: media-enter 700ms var(--motion) both;
}

.question-image-frame {
  display: grid;
  min-height: 148px;
  overflow: hidden;
  place-items: center;
  border-radius: 19px;
  background: #ffffff;
  box-shadow: inset 0 1px 1px rgba(37, 51, 45, 0.08);
}

.question-image {
  display: block;
  width: 100%;
  max-height: 390px;
  object-fit: contain;
}

#question-image-caption {
  padding: 8px 11px 4px;
  color: var(--muted);
  font-size: 0.75rem;
  line-height: 1.45;
  text-align: center;
}

#question-image-caption:empty {
  display: none;
}

.options-list {
  width: 100%;
  display: grid;
  gap: 10px;
  margin-top: 27px;
}

.option-button {
  position: relative;
  width: 100%;
  min-height: 61px;
  padding: 10px 17px 10px 11px;
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  align-items: center;
  gap: 14px;
  overflow: hidden;
  border: 1px solid var(--hairline);
  border-radius: 18px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.72);
  box-shadow:
    0 5px 15px rgba(51, 43, 32, 0.035),
    inset 0 1px 0 rgba(255, 255, 255, 0.95);
  text-align: left;
  cursor: pointer;
  transition:
    transform 480ms var(--motion),
    border-color 480ms var(--motion),
    background-color 480ms var(--motion),
    box-shadow 480ms var(--motion);
  animation: option-enter 560ms var(--motion) both;
}

.option-button:nth-child(2) {
  animation-delay: 45ms;
}

.option-button:nth-child(3) {
  animation-delay: 90ms;
}

.option-button:nth-child(4) {
  animation-delay: 135ms;
}

.option-button::after {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  content: "";
  opacity: 0;
  box-shadow: inset 4px 0 0 var(--accent);
  transition: opacity 480ms var(--motion);
}

.option-button:not(:disabled):hover {
  z-index: 1;
  border-color: rgba(206, 107, 60, 0.5);
  background: #fffaf4;
  box-shadow:
    0 13px 28px rgba(100, 69, 45, 0.09),
    inset 0 1px 0 rgba(255, 255, 255, 0.98);
  transform: translateY(-2px);
}

.option-button:not(:disabled):hover::after {
  opacity: 1;
}

.option-button:not(:disabled):active {
  transform: translateY(0) scale(0.992);
}

.option-button:focus-visible,
.primary-button:focus-visible {
  outline: 3px solid rgba(206, 107, 60, 0.3);
  outline-offset: 3px;
}

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

.option-key {
  position: relative;
  z-index: 1;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--hairline-strong);
  border-radius: 13px;
  color: var(--accent-dark);
  background: var(--paper-deep);
  font-size: 0.82rem;
  font-weight: 750;
  line-height: 1;
  text-transform: uppercase;
  transition:
    transform 480ms var(--motion),
    color 480ms var(--motion),
    border-color 480ms var(--motion),
    background-color 480ms var(--motion);
}

.option-button:not(:disabled):hover .option-key {
  transform: scale(1.04) rotate(-2deg);
}

.option-text {
  position: relative;
  z-index: 1;
  min-width: 0;
  font-size: 0.99rem;
  font-weight: 520;
  line-height: 1.48;
  overflow-wrap: anywhere;
}

.option-button.correct {
  border-color: rgba(38, 116, 85, 0.48);
  background: var(--good-soft);
  box-shadow:
    inset 4px 0 0 var(--good),
    inset 0 1px 0 rgba(255, 255, 255, 0.85);
}

.option-button.wrong {
  border-color: rgba(173, 73, 63, 0.45);
  background: var(--bad-soft);
  box-shadow:
    inset 4px 0 0 var(--bad),
    inset 0 1px 0 rgba(255, 255, 255, 0.85);
}

.option-button.correct .option-key {
  border-color: rgba(38, 116, 85, 0.38);
  color: #185a40;
  background: rgba(255, 255, 255, 0.58);
}

.option-button.wrong .option-key {
  border-color: rgba(173, 73, 63, 0.36);
  color: #923a33;
  background: rgba(255, 255, 255, 0.58);
}

.answer-footer {
  min-height: 65px;
  margin-top: 15px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.result-line {
  min-width: 0;
  display: flex;
  align-items: flex-start;
  gap: 9px;
  color: var(--muted);
  font-size: 0.93rem;
  font-weight: 650;
  line-height: 1.5;
}

.result-line:not(:empty)::before {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 0.42em;
  border-radius: 50%;
  content: "";
  background: currentColor;
  box-shadow: 0 0 0 4px color-mix(in srgb, currentColor 12%, transparent);
}

.result-line.good {
  color: var(--good);
}

.result-line.bad {
  color: var(--bad);
}

.primary-button {
  flex: 0 0 auto;
  min-height: 51px;
  margin: 0;
  padding: 7px 8px 7px 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  border: 0;
  border-radius: 999px;
  color: #ffffff;
  background: var(--rail);
  box-shadow:
    0 13px 26px rgba(23, 59, 53, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.16);
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 520ms var(--motion),
    background-color 520ms var(--motion),
    box-shadow 520ms var(--motion);
}

.primary-button::after {
  width: 37px;
  height: 37px;
  display: grid;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 50%;
  content: "→";
  color: var(--rail);
  background: #f0b184;
  font-size: 1.03rem;
  line-height: 1;
  transition: transform 520ms var(--motion);
}

#restart-button::after {
  content: "↻";
}

.primary-button:hover {
  background: #0e302b;
  box-shadow:
    0 17px 34px rgba(23, 59, 53, 0.26),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
  transform: translateY(-2px);
}

.primary-button:hover::after {
  transform: translateX(2px) rotate(-4deg) scale(1.05);
}

.primary-button:active {
  transform: translateY(0) scale(0.98);
}

.finish-view {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  animation: content-enter 700ms var(--motion) both;
}

.finish-orbit {
  position: relative;
  width: 72px;
  height: 72px;
  margin-bottom: 24px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(206, 107, 60, 0.24);
  border-radius: 50%;
  background: var(--accent-soft);
  box-shadow: 0 16px 34px rgba(124, 75, 48, 0.1);
}

.finish-orbit::before {
  width: 31px;
  height: 31px;
  border-radius: 50%;
  content: "";
  background: var(--rail);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.finish-orbit span {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  transform: translate(27px, -12px);
}

.finish-kicker {
  color: var(--accent-dark);
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.finish-view h2 {
  max-width: 720px;
  margin-top: 11px;
  font-family: var(--serif);
  font-size: clamp(2.1rem, 5vw, 3.8rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 1.08;
}

.finish-view p:not(.finish-kicker) {
  max-width: 570px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.6;
}

.finish-view .primary-button {
  margin-top: 28px;
}

.hidden {
  display: none !important;
}

@keyframes shell-enter {
  from {
    opacity: 0;
    transform: translateY(22px) scale(0.988);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes content-enter {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes option-enter {
  from {
    opacity: 0;
    transform: translateY(11px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes media-enter {
  from {
    opacity: 0;
    transform: translateY(13px) scale(0.99);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (max-width: 900px) {
  .quiz-panel {
    grid-template-columns: 235px minmax(0, 1fr);
  }

  .topbar {
    padding: 27px 22px 24px;
  }

  .brand {
    gap: 12px;
  }

  .brand-mark {
    width: 46px;
    height: 46px;
    border-radius: 15px;
  }

  .brand-mark::before {
    top: 17px;
  }

  .brand-mark::after {
    top: 27px;
  }

  .brand-mark span:nth-child(1) {
    top: 8px;
    left: 8px;
  }

  .brand-mark span:nth-child(2) {
    top: 18px;
    right: 7px;
  }

  .brand-mark span:nth-child(3) {
    bottom: 7px;
    left: 12px;
  }

  .score-card {
    margin-top: 38px;
  }

  .progress-region,
  .question-view,
  .finish-view {
    padding-right: 28px;
    padding-left: 28px;
  }
}

@media (max-width: 740px) {
  body {
    background:
      radial-gradient(circle at 10% 4%, rgba(206, 107, 60, 0.12), transparent 20rem),
      var(--canvas);
  }

  .app-shell {
    width: 100%;
    padding: 10px;
    place-items: stretch;
  }

  .quiz-frame {
    padding: 4px;
    border-radius: 25px;
  }

  .quiz-panel {
    min-height: calc(100dvh - 20px);
    display: flex;
    flex-direction: column;
    border-radius: 20px;
  }

  .topbar {
    padding: 20px;
    display: grid;
    grid-template-columns: 1fr;
    border-radius: 20px 20px 0 0;
  }

  .brand {
    align-items: center;
  }

  .brand-mark {
    width: 44px;
    height: 44px;
    border-radius: 14px;
  }

  .eyebrow {
    margin-bottom: 5px;
    font-size: 0.62rem;
  }

  h1 {
    max-width: none;
    font-size: 1.55rem;
    line-height: 1.05;
  }

  .brand p:last-child {
    margin-top: 5px;
    font-size: 0.76rem;
    line-height: 1.4;
  }

  .score-card {
    margin-top: 17px;
    padding: 10px 13px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    border-radius: 16px;
  }

  .score-label {
    font-size: 0.66rem;
  }

  .score-pill {
    margin-top: 0;
    gap: 5px;
    font-size: 1rem;
  }

  #score-value {
    font-size: 1.65rem;
  }

  .study-note {
    display: none;
  }

  .quiz-stage {
    flex: 1;
  }

  .progress-region {
    padding: 16px 18px 0;
  }

  .progress-copy {
    margin-bottom: 8px;
    font-size: 0.62rem;
  }

  .progress-copy span:last-child {
    display: none;
  }

  .question-view,
  .finish-view {
    padding: 18px 18px 23px;
  }

  .question-meta {
    display: grid;
    justify-content: stretch;
    gap: 7px;
  }

  #question-counter,
  #question-source {
    justify-self: start;
    min-height: 26px;
    padding: 4px 9px;
  }

  #question-source {
    max-width: 100%;
    justify-content: flex-start;
    overflow: visible;
    text-align: left;
    text-overflow: clip;
    white-space: normal;
  }

  #question-text {
    margin-top: 17px;
    font-size: clamp(1.22rem, 5.2vw, 1.45rem);
    line-height: 1.37;
  }

  .question-media {
    margin-top: 19px;
    padding: 4px;
    border-radius: 19px;
  }

  .question-image-frame {
    min-height: 110px;
    border-radius: 15px;
  }

  .question-image {
    max-height: 300px;
  }

  #question-image-caption {
    padding: 7px 8px 3px;
    font-size: 0.7rem;
  }

  .options-list {
    gap: 9px;
    margin-top: 20px;
  }

  .option-button {
    min-height: 58px;
    padding: 9px 12px 9px 9px;
    grid-template-columns: 39px minmax(0, 1fr);
    gap: 10px;
    border-radius: 16px;
  }

  .option-key {
    width: 36px;
    height: 36px;
    border-radius: 12px;
  }

  .option-text {
    font-size: 0.94rem;
    line-height: 1.45;
  }

  .answer-footer {
    min-height: 0;
    margin-top: 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
  }

  .result-line:empty {
    display: none;
  }

  .primary-button {
    width: 100%;
    justify-content: space-between;
    padding-left: 20px;
  }

  .finish-view {
    align-items: stretch;
    justify-content: center;
  }

  .finish-view h2 {
    font-size: clamp(2rem, 10vw, 3rem);
  }

  .finish-view .primary-button {
    margin-top: 24px;
  }
}

@media (max-width: 390px) {
  .app-shell {
    padding: 6px;
  }

  .quiz-panel {
    min-height: calc(100dvh - 12px);
  }

  .topbar {
    padding: 17px;
  }

  .brand-mark {
    display: none;
  }

  .question-view,
  .finish-view {
    padding-right: 14px;
    padding-left: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}