:root {
  --bg: #fbf7f2;
  --ink: #2b2320;
  --muted: #7a6f65;
  --accent: #c1440e;
  --accent-soft: #f3d9c9;
  --ok: #2f7a4f;
  --bad: #b5432f;
  --card: #ffffff;
  --border: #e7ddd2;
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
}

header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1rem 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

h1 {
  margin: 0 0 0.75rem;
  font-size: 1.4rem;
}

#tabs {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.tab {
  border: none;
  background: transparent;
  padding: 0.6rem 0.9rem;
  font-size: 0.9rem;
  color: var(--muted);
  cursor: pointer;
  border-radius: 8px 8px 0 0;
  white-space: nowrap;
}

.tab.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

.hidden { display: none !important; }

.hint {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 0;
}

.hint.small { font-size: 0.8rem; }

.empty {
  text-align: center;
  color: var(--muted);
  padding: 3rem 1rem;
}

/* Flashcard */
.flashcard {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  text-align: center;
}

.card-theme {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  margin-bottom: 1rem;
}

.card-word {
  font-size: 1.6rem;
  font-weight: 600;
  min-height: 2.4rem;
}

.card-answer {
  margin-top: 1rem;
  font-size: 1.2rem;
  color: var(--muted);
  border-top: 1px dashed var(--border);
  padding-top: 1rem;
}

.card-actions {
  margin-top: 1.5rem;
}

.card-actions button {
  font-size: 1rem;
  padding: 0.7rem 1.4rem;
  border-radius: 10px;
  border: none;
  cursor: pointer;
}

#btn-show {
  background: var(--accent);
  color: white;
}

#btn-grade { display: flex; gap: 0.75rem; justify-content: center; }

.btn-right { background: var(--ok); color: white; }
.btn-wrong { background: var(--bad); color: white; }

.card-progress {
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--muted);
}

/* Vocab themes */
.theme-block {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 1rem;
  overflow: hidden;
}

.theme-header {
  padding: 0.9rem 1rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
}

.theme-count {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.85rem;
}

.theme-words {
  border-top: 1px solid var(--border);
}

.word-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border);
  gap: 0.5rem;
}

.word-row:last-child { border-bottom: none; }

.word-es { font-weight: 600; }
.word-fr { color: var(--muted); font-size: 0.9rem; }

.word-add-btn {
  border: 1px solid var(--accent);
  background: transparent;
  color: var(--accent);
  border-radius: 8px;
  padding: 0.35rem 0.6rem;
  font-size: 0.8rem;
  cursor: pointer;
  white-space: nowrap;
}

.word-add-btn.added {
  background: var(--ok);
  border-color: var(--ok);
  color: white;
}

/* Phrases */
.situation-block {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 1rem;
  padding: 1rem;
}

.situation-block h3 {
  margin-top: 0;
  font-size: 1rem;
}

.phrase-row {
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--border);
}

.phrase-row:last-child { border-bottom: none; }

.phrase-es { font-weight: 600; }
.phrase-fr { color: var(--muted); font-size: 0.9rem; }

/* Form */
form {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
}

label {
  display: flex;
  flex-direction: column;
  font-size: 0.85rem;
  color: var(--muted);
  gap: 0.3rem;
}

input, select {
  font-size: 1rem;
  padding: 0.55rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
}

form button {
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.7rem;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
}

#custom-list { margin-top: 1rem; }

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.stat-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
}

.stat-number {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--muted);
}

.btn-danger {
  background: none;
  border: 1px solid var(--bad);
  color: var(--bad);
  padding: 0.6rem 1rem;
  border-radius: 8px;
  cursor: pointer;
}