:root {
  color-scheme: light;
  --bg: #f4efe6;
  --bg-soft: rgba(255, 255, 255, 0.72);
  --panel: rgba(255, 251, 245, 0.92);
  --panel-strong: #fff9f1;
  --ink: #1a2231;
  --muted: #5c6779;
  --line: rgba(29, 39, 58, 0.12);
  --accent: #146356;
  --accent-strong: #0b4d44;
  --accent-soft: rgba(20, 99, 86, 0.12);
  --sun: #ff8f42;
  --sun-soft: rgba(255, 143, 66, 0.18);
  --danger: #8c3d28;
  --shadow: 0 24px 60px rgba(56, 48, 35, 0.14);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --font-body: "IBM Plex Sans KR", sans-serif;
  --font-display: "Instrument Serif", serif;
}

* {
  box-sizing: border-box;
}

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

body {
  background:
    radial-gradient(circle at top left, rgba(255, 206, 141, 0.62), transparent 28%),
    radial-gradient(circle at top right, rgba(104, 182, 163, 0.25), transparent 24%),
    linear-gradient(180deg, #f9f6ee 0%, #f0e9dc 100%);
  color: var(--ink);
  font-family: var(--font-body);
}

button,
input,
textarea,
select {
  font: inherit;
}

.page-shell {
  position: relative;
  min-height: 100vh;
  overflow: hidden;
}

.ambient {
  position: fixed;
  inset: auto;
  width: 46vw;
  aspect-ratio: 1;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.72;
  pointer-events: none;
}

.ambient-left {
  top: -12vw;
  left: -14vw;
  background: rgba(255, 164, 74, 0.2);
}

.ambient-right {
  bottom: -18vw;
  right: -14vw;
  background: rgba(20, 99, 86, 0.16);
}

.app {
  position: relative;
  z-index: 1;
  width: min(100%, 760px);
  margin: 0 auto;
  padding: 22px 18px 40px;
}

.hero,
.group-card,
.quiz-card,
.reveal-card,
.end-card {
  backdrop-filter: blur(20px);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.65);
  box-shadow: var(--shadow);
}

.hero {
  padding: 26px 22px;
  border-radius: var(--radius-xl);
  margin-bottom: 18px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--bg-soft);
  color: var(--accent-strong);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.hero h1,
.end-title {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 9vw, 4rem);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 0.92;
}

.hero p,
.group-card p,
.meta-line,
.reveal-empty,
.end-copy,
.footer-note {
  margin: 0;
  color: var(--muted);
  line-height: 1.58;
}

.group-grid {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.group-card {
  padding: 20px 18px;
  border-radius: var(--radius-lg);
  text-align: left;
  cursor: pointer;
  transition:
    transform 180ms ease,
    box-shadow 180ms ease,
    border-color 180ms ease;
}

.group-card:hover,
.group-card:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 26px 50px rgba(51, 40, 26, 0.16);
  border-color: rgba(20, 99, 86, 0.28);
  outline: none;
}

.group-link-card {
  display: block;
  margin-top: 20px;
  text-decoration: none;
  color: inherit;
  background:
    linear-gradient(135deg, rgba(20, 99, 86, 0.1), rgba(255, 143, 66, 0.08)),
    var(--panel);
}

.group-head,
.status-bar,
.quiz-head,
.reveal-head,
.end-badges {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.group-head strong,
.quiz-head strong {
  font-size: 1rem;
  font-weight: 700;
}

.topic {
  margin: 8px 0 10px;
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.pill,
.tiny-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  white-space: nowrap;
}

.pill {
  padding: 8px 12px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 700;
}

.tiny-pill {
  min-width: 78px;
  padding: 6px 10px;
  background: rgba(255, 255, 255, 0.76);
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 700;
}

.quiz-shell,
.end-shell {
  display: grid;
  gap: 14px;
}

.status-bar {
  padding: 0 2px;
}

.status-title {
  display: grid;
  gap: 6px;
}

.status-title h2 {
  margin: 0;
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.progress-track {
  position: relative;
  height: 10px;
  border-radius: 999px;
  background: rgba(26, 34, 49, 0.08);
  overflow: hidden;
}

.progress-value {
  position: absolute;
  inset: 0 auto 0 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--sun) 0%, var(--accent) 100%);
}

.quiz-card {
  border-radius: var(--radius-xl);
  padding: 22px 20px;
}

.quiz-question {
  margin: 22px 0 8px;
  font-size: clamp(1.35rem, 5vw, 2rem);
  font-weight: 700;
  line-height: 1.34;
  letter-spacing: -0.03em;
  word-break: keep-all;
}

.quiz-subtext {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.95rem;
}

.reveal-stack {
  display: grid;
  gap: 12px;
}

.reveal-card {
  border-radius: var(--radius-lg);
  padding: 18px 18px 16px;
  min-height: 116px;
}

.reveal-head strong {
  font-size: 1rem;
}

.reveal-card.hint {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 248, 235, 0.92)),
    var(--panel);
}

.reveal-card.answer {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(236, 249, 245, 0.94)),
    var(--panel);
}

.reveal-content {
  margin-top: 14px;
  white-space: pre-wrap;
  word-break: keep-all;
  line-height: 1.72;
  font-size: 0.98rem;
}

.reveal-empty {
  display: grid;
  place-items: center;
  min-height: 58px;
  text-align: center;
  font-size: 0.95rem;
}

.controls {
  position: sticky;
  bottom: 12px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  padding: 12px;
  border-radius: 24px;
  background: rgba(255, 252, 247, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(18px);
  box-shadow: 0 22px 46px rgba(49, 40, 28, 0.14);
}

.button {
  min-height: 54px;
  border: 0;
  border-radius: 18px;
  cursor: pointer;
  transition:
    transform 140ms ease,
    opacity 140ms ease,
    box-shadow 140ms ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.94);
  color: var(--ink);
  box-shadow: inset 0 0 0 1px var(--line);
}

.button.primary {
  background: linear-gradient(135deg, var(--accent) 0%, #1d8473 100%);
  color: #fff;
  font-weight: 700;
}

.button.ghost {
  background: linear-gradient(135deg, rgba(255, 143, 66, 0.94) 0%, #f7793c 100%);
  color: #fff;
  font-weight: 700;
}

.button:disabled {
  opacity: 0.55;
  cursor: default;
  transform: none;
}

.end-card {
  padding: 26px 22px;
  border-radius: var(--radius-xl);
}

.end-shell {
  padding-top: 14px;
}

.end-actions {
  display: grid;
  gap: 10px;
}

.footer-note {
  padding: 4px 2px 0;
  font-size: 0.86rem;
  text-align: center;
}

@media (min-width: 700px) {
  .app {
    padding: 30px 24px 52px;
  }

  .group-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .end-actions {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .app {
    padding-inline: 14px;
  }

  .hero,
  .quiz-card,
  .end-card {
    padding-inline: 16px;
  }

  .controls {
    grid-template-columns: 1fr;
  }

  .button {
    min-height: 50px;
  }
}