*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --radical: #00a0e9;
  --kanji: #f092b0;
  --vocabulary: #b783d6;
  --bg: #f5f5f5;
  --text: #333;
  --muted: #888;
  --white: #fff;
  --border: #ddd;
  --error: #e74c3c;
  --success: #27ae60;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

a {
  color: var(--radical);
}

.update-banner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.5rem 1rem;
  background: #fff8e6;
  border-bottom: 1px solid #f0d78c;
  font-size: 0.9rem;
}

.btn-small {
  font-size: 0.85rem;
  padding: 0.35rem 0.75rem;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.home-link, .settings-link {
  text-decoration: none;
  color: var(--text);
  font-size: 1.25rem;
  width: 2rem;
  text-align: center;
}

.top-title {
  font-weight: 600;
}

.sync-status {
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
  flex: 1;
  padding: 0 0.5rem;
}

.sync-status[data-state="offline"] { color: #e67e22; }
.sync-status[data-state="error"] { color: var(--error); }
.sync-status[data-state="syncing"] { color: var(--radical); }

main {
  max-width: 480px;
  margin: 0 auto;
}

.screen {
  padding: 2rem 1rem;
  text-align: center;
}

.screen h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
}

.subtitle {
  color: var(--muted);
  margin: 0 0 1.5rem;
  line-height: 1.5;
}

.actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
}

.btn {
  border: none;
  border-radius: 4px;
  padding: 0.65rem 1.25rem;
  font-size: 1rem;
  cursor: pointer;
  font-weight: 600;
}

.btn-primary {
  background: var(--radical);
  color: var(--white);
}

.btn-secondary {
  background: var(--white);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-large {
  padding: 0.85rem 2rem;
  font-size: 1.1rem;
  min-width: 200px;
}

.resume-panel {
  background: #fff8e1;
  border: 1px solid #ffe082;
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}

/* Review screen */
#screen-review {
  padding: 0;
  max-width: 100%;
}

.review-header {
  position: relative;
  padding: 1.5rem 1rem 2rem;
  color: var(--white);
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.review-header.type-radical { background: var(--radical); }
.review-header.type-kanji { background: var(--kanji); }
.review-header.type-vocabulary { background: var(--vocabulary); }

.review-header.shake {
  animation: shake 0.4s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}

.review-stats {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  display: flex;
  gap: 0.75rem;
  font-size: 0.85rem;
  opacity: 0.95;
}

.review-character {
  font-size: 5rem;
  line-height: 1.1;
  font-weight: 400;
}

.review-character img {
  max-height: 120px;
  max-width: 200px;
  filter: brightness(0) invert(1);
}

.review-prompt-bar {
  background: #e8e8e8;
  text-align: center;
  padding: 0.6rem;
  font-size: 0.95rem;
  color: #555;
}

.answer-form {
  display: flex;
  background: var(--white);
  border-bottom: 1px solid var(--border);
}

.answer-form input {
  flex: 1;
  border: none;
  padding: 1rem;
  font-size: 1.1rem;
  outline: none;
  background: transparent;
}

.submit-btn {
  border: none;
  background: transparent;
  font-size: 1.5rem;
  color: var(--muted);
  padding: 0 1rem;
  cursor: pointer;
}

.answer-form input.input-rejected {
  background: #fdecea;
}

.answer-form input.shake {
  animation: input-shake 0.4s ease;
}

@keyframes input-shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

.feedback {
  margin: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 4px;
  text-align: left;
  white-space: pre-wrap;
  font-size: 0.9rem;
  line-height: 1.5;
}

.feedback-incorrect {
  background: #fdecea;
  color: var(--error);
  border: 1px solid #f5c6cb;
}

.feedback-info {
  background: #e8f4fd;
  color: #2c6fad;
  border: 1px solid #b8daff;
}

.toolbar {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
}

.tool-btn {
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--white);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tool-btn:active {
  background: #eee;
}

/* Settings */
.settings-page {
  padding: 2rem 1rem;
  max-width: 480px;
  margin: 0 auto;
}

.settings-form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.settings-form label {
  font-weight: 600;
  font-size: 0.9rem;
}

.settings-form input {
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 1rem;
}

.token-status {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

.cache-info h2 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.lesson-picker {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1rem 0;
}

.lesson-picker label {
  font-size: 0.9rem;
  color: var(--muted);
}

.lesson-picker select {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 1rem;
  background: var(--white);
}

.lesson-present-body {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin: 1rem 0;
}

.lesson-present-type {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.lesson-present-block {
  margin-bottom: 1rem;
}

.lesson-present-block h3 {
  margin: 0 0 0.35rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.lesson-present-block p {
  margin: 0;
  line-height: 1.5;
  white-space: pre-wrap;
}

@media (min-width: 481px) {
  .review-character {
    font-size: 6rem;
  }
}