:root {
  --bg: #f8fafc;
  --text: #0f172a;
  --muted: #475569;
  --card: #ffffff;
  --accent: #0ea5e9;
  --ok: #065f46;
  --error: #7f1d1d;
  --border: #cbd5e1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: linear-gradient(120deg, #e0f2fe, var(--bg));
}

.container {
  max-width: 760px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem 1.25rem;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
}

.grid {
  display: grid;
  gap: 0.85rem;
}

label,
legend,
p,
li {
  line-height: 1.5;
}

input,
select,
button {
  width: 100%;
  padding: 0.6rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
}

button,
.button {
  background: var(--accent);
  color: white;
  border: none;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  display: inline-block;
}

.button.secondary,
button.secondary {
  background: #64748b;
}

.danger,
button.danger {
  background: #b91c1c;
}

.topbar-form {
  margin-bottom: 0.75rem;
}

.topbar-form .button {
  width: auto;
  min-width: 140px;
}

.actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  align-items: center;
}

.actions form {
  margin: 0;
}

.actions button,
.actions .button {
  width: auto;
}

.audio-table {
  width: 100%;
  border-collapse: collapse;
}

.audio-table th,
.audio-table td {
  text-align: left;
  border-bottom: 1px solid var(--border);
  padding: 0.55rem 0.35rem;
  vertical-align: middle;
}

.audio-table audio {
  width: 260px;
  max-width: 100%;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
}

.lesson-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.4rem;
}

.lesson-grid label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lesson-grid input {
  width: auto;
}

.vocab-list {
  max-height: 280px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.5rem;
}

.vocab-row {
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
  padding: 0.3rem 0.1rem;
}

.vocab-row input {
  width: auto;
  margin-top: 0.2rem;
}

.muted,
.hint {
  color: var(--muted);
}

.block-settings {
  display: grid;
  gap: 0.7rem;
  border: 1px dashed var(--border);
  padding: 0.7rem;
  border-radius: 10px;
}

.hidden {
  display: none;
}

.ok {
  border-color: #6ee7b7;
}

.error {
  border-color: #fca5a5;
}

@media (max-width: 600px) {
  .container {
    margin: 1rem auto;
  }
}