:root {
  color-scheme: light;
  font-family: "Noto Sans KR", sans-serif;
  background: #f6f7fb;
  color: #1f2532;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  display: flex;
  justify-content: center;
}

.app {
  width: min(1100px, 100%);
  padding: 32px 24px 56px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.app__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: white;
  padding: 24px 28px;
  border-radius: 20px;
  box-shadow: 0 10px 30px rgba(30, 48, 96, 0.08);
}

.app__eyebrow {
  font-weight: 600;
  color: #5e6d91;
  margin-bottom: 6px;
}

.app__description {
  margin-top: 8px;
  color: #525e7a;
  max-width: 520px;
}

.app__footer {
  text-align: center;
  color: #6b7280;
  font-size: 0.9rem;
}

.panel {
  background: white;
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 14px 35px rgba(19, 33, 71, 0.08);
}

.panel__section {
  display: none;
  flex-direction: column;
  gap: 20px;
}

.panel__section.is-active {
  display: flex;
}

.hero {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  align-items: center;
}

.hero__content p {
  margin-top: 10px;
  color: #56617a;
}

.hero__actions {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.button-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.row-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px;
}

.row-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-top: 10px;
}

.row-quiz {
  margin-top: 16px;
  display: grid;
  gap: 16px;
  padding: 18px;
  border-radius: 18px;
  border: 1px solid #e4e9f6;
  background: #fbfcff;
}

.row-quiz__header {
  display: grid;
  gap: 6px;
}

.row-quiz__card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  border-radius: 14px;
  background: #eef2ff;
  border: 1px solid #dbe3ff;
}

.row-quiz__label {
  font-size: 0.9rem;
  color: #5a6887;
}

.row-quiz__glyph {
  font-size: 2.2rem;
  font-weight: 700;
}

.row-quiz__options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
}

.row-quiz__feedback {
  min-height: 24px;
  font-weight: 600;
}

.row-card {
  border: 1px solid #e3e8f3;
  border-radius: 16px;
  padding: 16px;
  background: #f8f9ff;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 140px;
}

.row-card__glyph {
  font-size: 2.4rem;
  font-weight: 700;
}

.row-card__mnemonic {
  font-size: 0.95rem;
  color: #4b5877;
  line-height: 1.4;
}

.row-card__tag {
  font-size: 0.8rem;
  color: #7a89a8;
}

.section__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.section__actions {
  display: flex;
  gap: 10px;
}

.section__hint {
  color: #5a6887;
}

.practice {
  display: grid;
  gap: 20px;
}

.practice__card {
  background: #f4f6ff;
  border-radius: 18px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.practice__badge {
  align-self: flex-start;
  background: #233a82;
  color: white;
  font-size: 0.8rem;
  padding: 4px 10px;
  border-radius: 999px;
}

.practice__word {
  font-size: 2.6rem;
  font-weight: 700;
}

.practice__meaning {
  color: #5b6680;
}

.practice__form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.practice__input {
  display: flex;
  gap: 10px;
}

.practice__input input {
  flex: 1;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid #d1d8f0;
  font-size: 1rem;
}

.practice__feedback {
  min-height: 24px;
  font-weight: 600;
}

.practice__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
  background: #f9fafc;
  border-radius: 12px;
  padding: 14px;
  text-align: center;
}

.practice__stats span {
  color: #7a879f;
  font-size: 0.85rem;
}

button {
  border: none;
  font-size: 1rem;
  padding: 12px 18px;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(35, 58, 130, 0.18);
}

button.primary {
  background: #233a82;
  color: white;
}

button.secondary {
  background: #f0f3ff;
  color: #233a82;
}

button.card {
  background: #f9fafc;
  border: 1px solid #e2e6f4;
  font-weight: 600;
}

button.card.is-selected {
  border-color: #233a82;
  box-shadow: inset 0 0 0 2px rgba(35, 58, 130, 0.25);
}

button.ghost {
  background: transparent;
  border: 1px solid #d5dcee;
  color: #4a5673;
  font-weight: 600;
}

@media (max-width: 720px) {
  .app__header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .practice__input {
    flex-direction: column;
  }
}