:root {
  --bg: #f4efe6;
  --bg-accent: #efe3cf;
  --panel: rgba(255, 252, 246, 0.88);
  --ink: #18212f;
  --muted: #5d6a79;
  --line: rgba(24, 33, 47, 0.08);
  --primary: #0e7a66;
  --primary-dark: #0a6151;
  --accent: #df7846;
  --danger: #cc503d;
  --success: #277347;
  --shadow: 0 24px 60px rgba(24, 33, 47, 0.12);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(223, 120, 70, 0.22), transparent 32%),
    radial-gradient(circle at top right, rgba(14, 122, 102, 0.14), transparent 24%),
    linear-gradient(180deg, var(--bg) 0%, #f8f5ef 100%);
}

button,
input {
  font: inherit;
}

.page-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.hero {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding: 20px 8px 28px;
}

.hero h1 {
  margin: 10px 0 8px;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1.06;
}

.eyebrow,
.section-label {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
}

.subtitle {
  margin: 0;
  max-width: 640px;
  color: var(--muted);
  line-height: 1.6;
}

.hero-badge {
  display: grid;
  gap: 4px;
  min-width: 128px;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  color: white;
  background: linear-gradient(135deg, var(--primary) 0%, #0d574f 100%);
  box-shadow: var(--shadow);
}

.hero-badge span {
  font-size: 0.85rem;
  opacity: 0.82;
}

.hero-badge strong {
  font-size: 1.75rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  gap: 24px;
}

.panel {
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.52);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
}

.controls-panel,
.quiz-panel {
  padding: 24px;
}

.section-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}

.section-head h2 {
  margin: 4px 0 0;
  font-size: 1.45rem;
}

.set-list {
  display: grid;
  gap: 12px;
}

.set-option {
  display: flex;
  gap: 12px;
  align-items: start;
  padding: 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.set-option input {
  margin-top: 4px;
  accent-color: var(--primary);
}

.set-option-title {
  margin: 0 0 4px;
  font-weight: 700;
}

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

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 20px;
}

.checkbox-row {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
}

.checkbox-row input {
  accent-color: var(--accent);
}

.primary-button,
.secondary-button,
.ghost-button,
.result-button {
  border: none;
  cursor: pointer;
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    background 0.18s ease,
    color 0.18s ease;
}

.primary-button,
.secondary-button,
.ghost-button {
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 700;
}

.primary-button {
  color: white;
  background: linear-gradient(135deg, var(--primary) 0%, #15977f 100%);
  box-shadow: 0 14px 32px rgba(14, 122, 102, 0.28);
}

.secondary-button {
  color: var(--ink);
  background: rgba(24, 33, 47, 0.06);
}

.ghost-button {
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
}

.primary-button:hover,
.secondary-button:hover,
.ghost-button:hover,
.result-button:hover,
.card-face:hover {
  transform: translateY(-1px);
}

.hint {
  min-height: 24px;
  margin: 16px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.progress-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 74px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(14, 122, 102, 0.1);
  color: var(--primary-dark);
  font-weight: 800;
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 360px;
  text-align: center;
  padding: 24px;
  border: 1px dashed rgba(24, 33, 47, 0.12);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.6);
}

.empty-state h3 {
  margin-bottom: 8px;
}

.quiz-card {
  display: grid;
  gap: 18px;
}

.card-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.set-chip,
.wrong-chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 700;
}

.set-chip {
  color: var(--primary-dark);
  background: rgba(14, 122, 102, 0.12);
}

.wrong-chip {
  color: var(--accent);
  background: rgba(223, 120, 70, 0.12);
}

.card-face {
  width: 100%;
  padding: 32px 28px;
  text-align: left;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(24, 33, 47, 0.08);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(247, 241, 232, 0.96)),
    linear-gradient(135deg, rgba(14, 122, 102, 0.1), rgba(223, 120, 70, 0.08));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.card-face strong {
  display: block;
  margin-top: 12px;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.45;
}

.card-label {
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.answer-wrap {
  display: grid;
  gap: 10px;
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid rgba(24, 33, 47, 0.08);
}

.answer-text {
  font-size: clamp(1.25rem, 2.7vw, 1.8rem);
  font-weight: 800;
  color: var(--primary-dark);
}

.card-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.result-buttons {
  display: flex;
  gap: 10px;
}

.result-button {
  min-width: 64px;
  padding: 12px 0;
  border-radius: 16px;
  color: white;
  font-size: 1rem;
  font-weight: 800;
}

.result-button.correct {
  background: var(--success);
}

.result-button.wrong {
  background: var(--danger);
}

.hidden {
  display: none !important;
}

@media (max-width: 860px) {
  .page-shell {
    width: min(100% - 24px, 1120px);
    padding-top: 20px;
  }

  .hero {
    padding-left: 0;
    padding-right: 0;
    flex-direction: column;
    align-items: start;
  }

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

  .actions,
  .card-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-badge {
    width: fit-content;
  }

  .section-head {
    align-items: center;
  }

  .result-buttons {
    width: 100%;
  }

  .result-button {
    flex: 1;
  }
}

.login-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-card {
  width: min(440px, 100%);
  display: grid;
  gap: 16px;
  padding: 32px;
  border-radius: var(--radius-xl);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.52);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.login-card h1 {
  margin: 0;
  font-size: 2rem;
}

.password-label {
  font-weight: 800;
  color: var(--ink);
}

.password-input {
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.86);
  color: var(--ink);
  outline: none;
}

.password-input:focus {
  border-color: rgba(14, 122, 102, 0.55);
  box-shadow: 0 0 0 4px rgba(14, 122, 102, 0.12);
}

.quiz-options {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.field-row {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-weight: 700;
}

.select-input {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
  color: var(--ink);
  outline: none;
}

.select-input:focus {
  border-color: rgba(14, 122, 102, 0.55);
  box-shadow: 0 0 0 4px rgba(14, 122, 102, 0.12);
}

.compact-head {
  margin-bottom: 12px;
}

.compact-head h3 {
  margin: 4px 0 0;
  font-size: 1.25rem;
}

.wrong-list-panel {
  margin-top: 18px;
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--line);
}

.wrong-list {
  display: grid;
  gap: 12px;
}

.wrong-list-item {
  display: grid;
  gap: 10px;
  padding: 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 252, 246, 0.92);
  border: 1px solid var(--line);
}

.wrong-set-name {
  margin: 0;
  color: var(--primary);
  font-size: 0.86rem;
  font-weight: 800;
}

.wrong-pair {
  display: grid;
  gap: 4px;
}

.wrong-pair span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

.wrong-pair strong {
  line-height: 1.45;
}

.single-screen-layout {
  grid-template-columns: minmax(0, 760px);
  justify-content: center;
}

.single-screen-layout .controls-panel,
.single-screen-layout .quiz-panel {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

@media (max-width: 860px) {
  .header-actions {
    width: 100%;
    justify-content: space-between;
  }
}

.answer-detail {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: clamp(0.95rem, 2vw, 1.08rem);
  font-weight: 600;
  line-height: 1.55;
  text-align: left;
}

.answer-detail:empty {
  display: none;
}

.question-limit-row {
  font-size: 1.15rem;
  color: var(--ink);
}

.question-limit-row > span {
  font-size: 1.22rem;
  font-weight: 900;
}

.question-limit-select {
  min-height: 52px;
  padding: 14px 16px;
  font-size: 1.18rem;
  font-weight: 800;
}