:root {
  --bg: #f4ebdc;
  --paper: rgba(255, 249, 238, 0.74);
  --paper-strong: rgba(255, 249, 238, 0.9);
  --ink: #211815;
  --muted: #6a584f;
  --accent: #bb4327;
  --accent-deep: #8d2613;
  --gold: #c59a42;
  --line: rgba(33, 24, 21, 0.1);
  --success: #1e7d58;
  --error: #b7322c;
  --shadow: 0 32px 80px rgba(67, 29, 14, 0.16);
}

* {
  box-sizing: border-box;
}

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

body {
  position: relative;
  overflow-x: hidden;
  background:
    radial-gradient(circle at top left, rgba(197, 154, 66, 0.26), transparent 30%),
    radial-gradient(circle at 80% 18%, rgba(187, 67, 39, 0.18), transparent 24%),
    linear-gradient(135deg, #f7eedf 0%, #ead8ba 48%, #e4d2b5 100%);
  color: var(--ink);
  font-family: "Zen Kaku Gothic New", sans-serif;
}

body::before,
body::after {
  content: "";
  position: fixed;
  inset: auto;
  z-index: 0;
  pointer-events: none;
}

body::before {
  top: -4rem;
  right: -2rem;
  width: 18rem;
  height: 18rem;
  border-radius: 50%;
  background:
    radial-gradient(circle at center, rgba(197, 154, 66, 0.78) 0 26%, rgba(197, 154, 66, 0.12) 27% 51%, transparent 52%),
    radial-gradient(circle at center, rgba(187, 67, 39, 0.1), transparent 70%);
  filter: blur(1px);
  animation: drift 12s ease-in-out infinite;
}

body::after {
  left: -6rem;
  bottom: -5rem;
  width: 20rem;
  height: 20rem;
  border: 1px solid rgba(33, 24, 21, 0.1);
  transform: rotate(18deg);
}

.noise {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.07;
  background-image:
    linear-gradient(transparent 0 97%, rgba(0, 0, 0, 0.4) 100%),
    radial-gradient(circle at center, rgba(0, 0, 0, 0.6) 0 10%, transparent 11%);
  background-size: 100% 3px, 7px 7px;
  mix-blend-mode: multiply;
}

.app-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem 1.2rem;
}

.hero-panel {
  width: min(1120px, 100%);
  padding: clamp(1.5rem, 2vw, 2rem);
  border: 1px solid rgba(33, 24, 21, 0.08);
  background:
    linear-gradient(135deg, var(--paper-strong), rgba(251, 243, 228, 0.72)),
    linear-gradient(transparent 0 97%, rgba(33, 24, 21, 0.04) 100%);
  background-size: auto, 100% 2.8rem;
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.eyebrow,
.question-label,
.score-heading,
.feedback-badge {
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
}

h1 {
  margin: 0.5rem 0 1rem;
  font-family: "Yuji Mai", serif;
  font-size: clamp(2.7rem, 7vw, 5.6rem);
  line-height: 0.96;
  font-weight: 400;
}

.lead {
  width: min(44rem, 100%);
  margin: 0;
  font-size: 1rem;
  line-height: 1.9;
  color: var(--muted);
}

.start-cluster {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 2rem 0 0;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.primary-button,
.secondary-button {
  appearance: none;
  border: none;
  cursor: pointer;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease,
    opacity 160ms ease;
}

.primary-button {
  padding: 0.95rem 1.4rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  color: #fff7f2;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 16px 30px rgba(141, 38, 19, 0.26);
}

.secondary-button {
  min-width: 6rem;
  padding: 0.95rem 1.1rem;
  border-radius: 18px;
  background: rgba(33, 24, 21, 0.9);
  color: #fffaf3;
  font-weight: 700;
}

.primary-button:hover,
.secondary-button:hover,
.primary-button:focus-visible,
.secondary-button:focus-visible {
  transform: translateY(-2px);
}

.primary-button:focus-visible,
.secondary-button:focus-visible,
input:focus-visible {
  outline: 2px solid rgba(197, 154, 66, 0.85);
  outline-offset: 3px;
}

.quiz-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(280px, 0.9fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

.question-card,
.score-card {
  position: relative;
  overflow: hidden;
  min-height: 100%;
  padding: 1.4rem;
  border-radius: 26px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 252, 246, 0.92), rgba(248, 239, 225, 0.84));
}

.question-card::before {
  content: "十二支十干";
  position: absolute;
  right: -1rem;
  top: 1rem;
  font-family: "Yuji Mai", serif;
  font-size: clamp(2.5rem, 7vw, 4.2rem);
  color: rgba(187, 67, 39, 0.08);
  transform: rotate(-8deg);
}

.question-meta,
.score-grid {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.counter {
  font-family: "Yuji Mai", serif;
  font-size: 1.5rem;
  color: var(--accent);
}

.year-wrap {
  display: grid;
  gap: 0.35rem;
  margin-top: 1rem;
  padding: 1rem 0 1.1rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.year-caption,
.input-label,
.score-label,
.mini-guide-title {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.year-value {
  margin: 0;
  font-family: "Yuji Mai", serif;
  font-size: clamp(3.5rem, 10vw, 6.8rem);
  line-height: 0.95;
}

.answer-form {
  margin-top: 1.25rem;
}

.input-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.8rem;
  margin-top: 0.65rem;
}

input {
  width: 100%;
  min-width: 0;
  padding: 1rem 1.1rem;
  border-radius: 18px;
  border: 1px solid rgba(33, 24, 21, 0.16);
  background: rgba(255, 252, 247, 0.96);
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
}

input::placeholder {
  color: #9c8678;
}

.feedback {
  margin-top: 1.15rem;
  padding: 1rem;
  border-radius: 22px;
  background: rgba(255, 250, 240, 0.88);
  border: 1px solid rgba(33, 24, 21, 0.08);
}

.feedback-badge {
  margin: 0;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--gold);
}

.feedback-text {
  margin: 0.4rem 0 0;
  line-height: 1.8;
}

.feedback.is-correct {
  background: rgba(31, 125, 88, 0.1);
  border-color: rgba(31, 125, 88, 0.18);
}

.feedback.is-correct .feedback-badge {
  color: var(--success);
}

.feedback.is-wrong {
  background: rgba(183, 50, 44, 0.1);
  border-color: rgba(183, 50, 44, 0.18);
}

.feedback.is-wrong .feedback-badge {
  color: var(--error);
}

.feedback.is-idle .feedback-badge {
  color: var(--gold);
}

.next-button {
  margin-top: 0.9rem;
}

.score-card {
  display: grid;
  gap: 1.1rem;
  align-content: start;
}

.score-grid {
  gap: 1rem;
  flex-direction: column;
}

.score-grid strong {
  display: block;
  margin-top: 0.2rem;
  font-size: clamp(1.7rem, 5vw, 2.3rem);
  font-family: "Yuji Mai", serif;
}

.mini-guide {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  line-height: 1.8;
}

.mini-guide p {
  margin: 0.4rem 0 0;
}

.is-hidden {
  display: none !important;
}

@keyframes drift {
  0%,
  100% {
    transform: translate3d(0, 0, 0);
  }
  50% {
    transform: translate3d(-10px, 14px, 0);
  }
}

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

  .score-grid {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .score-grid > div {
    min-width: 7rem;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 1rem;
  }

  .hero-panel,
  .question-card,
  .score-card {
    padding: 1.1rem;
    border-radius: 22px;
  }

  .lead {
    font-size: 0.95rem;
  }

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

  .secondary-button,
  .primary-button {
    width: 100%;
  }

  .start-cluster {
    align-items: stretch;
  }
}