:root {
  --bg: #f5ebdf;
  --bg-deep: #efdac6;
  --ink: #180f0d;
  --muted: #5c4740;
  --card: #fff8f1;
  --accent: #ff5a36;
  --line: #1d1110;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 123, 77, 0.24), transparent 28%),
    radial-gradient(circle at 85% 20%, rgba(29, 17, 16, 0.08), transparent 18%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-deep) 100%);
  color: var(--ink);
}

.app-shell {
  width: min(100%, 760px);
  min-height: 100vh;
  margin: 0 auto;
  padding: 32px 20px 40px;
}

.screen {
  display: none;
  min-height: calc(100vh - 72px);
}

.screen.active {
  display: flex;
}

.screen-home {
  flex-direction: column;
  justify-content: center;
}

.hero-badge,
.result-badge {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--line);
  color: #fff1e8;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1px;
}

.hero-title,
.result-title {
  margin: 22px 0 0;
  font-size: clamp(42px, 9vw, 78px);
  line-height: 0.98;
  letter-spacing: -0.04em;
  font-weight: 800;
}

.primary-btn {
  margin-top: 52px;
  width: 100%;
  border: 3px solid var(--line);
  border-radius: 999px;
  background: var(--accent);
  color: #fff7ef;
  box-shadow: 0 8px 0 rgba(29, 17, 16, 0.18);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  padding: 18px 24px;
  cursor: pointer;
}

.quiz-topbar {
  width: 100%;
  margin-bottom: 20px;
}

.question-counter {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 14px;
  color: var(--muted);
}

.progress-track {
  height: 12px;
  border-radius: 999px;
  background: rgba(29, 17, 16, 0.14);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--line) 0%, var(--accent) 100%);
  transition: width 160ms ease;
}

.screen-quiz,
.screen-result {
  flex-direction: column;
}

.quiz-card,
.result-card {
  background: var(--card);
  border: 3px solid var(--line);
  border-radius: 24px;
  box-shadow: 12px 12px 0 rgba(29, 17, 16, 0.1);
  padding: 24px 20px;
}

.question-title {
  margin: 0;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.35;
}

.options-list {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.option-btn {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  width: 100%;
  text-align: left;
  border: 3px solid var(--line);
  border-radius: 20px;
  background: #fff8f2;
  box-shadow: 8px 8px 0 rgba(29, 17, 16, 0.08);
  padding: 18px 16px;
  cursor: pointer;
}

.option-key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  flex: 0 0 36px;
  background: var(--accent);
  color: #fff5ed;
  font-size: 16px;
  font-weight: 700;
}

.option-text {
  font-size: 18px;
  line-height: 1.55;
  color: #3b2a25;
}

.result-subtitle {
  margin: 18px 0 0;
  font-size: 22px;
  line-height: 1.55;
  color: var(--muted);
}

.result-card {
  margin-top: 24px;
}

.result-description {
  margin: 0;
  font-size: 22px;
  line-height: 1.8;
  color: #2f211e;
}

@media (max-width: 640px) {
  .app-shell {
    padding: 20px 16px 28px;
  }

  .screen {
    min-height: calc(100vh - 48px);
  }

  .primary-btn {
    font-size: 18px;
  }

  .option-text,
  .result-description {
    font-size: 17px;
  }
}