:root {
  --bg: #f7f8fc;
  --card: #ffffff;
  --text: #1e2430;
  --muted: #5f6b7a;
  --accent: #2463eb;
  --success: #0f9d58;
  --border: #dce3ef;
}

body.dark-mode {
  --bg: #0f1420;
  --card: #1a2333;
  --text: #e6edf7;
  --muted: #a5b3c7;
  --accent: #5a8dff;
  --success: #4dd184;
  --border: #31405a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  width: min(980px, 92vw);
  margin: 2rem auto;
  display: grid;
  gap: 1rem;
}

header h1 {
  margin-bottom: 0.2rem;
}

header p {
  margin-top: 0;
  color: var(--muted);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
}

.grid {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.92rem;
  color: var(--muted);
}

input,
select,
textarea,
button {
  font: inherit;
}

input,
select,
textarea {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  background: #fff;
}

button {
  margin-top: 0.9rem;
  border: none;
  border-radius: 8px;
  padding: 0.65rem 0.9rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

.theme-toggle {
  margin-top: 0.6rem;
  width: fit-content;
}

.backup-help {
  margin-top: 0;
  color: var(--muted);
}

.backup-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.backup-actions button {
  margin-top: 0;
}

.task-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.task-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  align-items: start;
}

.task-item h3 {
  margin: 0 0 0.2rem;
  font-size: 1rem;
}

.meta {
  color: var(--muted);
  font-size: 0.86rem;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 600;
}

.badge.done {
  background: #ddf5e8;
  color: var(--success);
}

.badge.pending {
  background: #eff2f8;
  color: #5a6472;
}

.task-actions button {
  margin: 0;
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
}

.hidden {
  display: none;
}

.empty {
  color: var(--muted);
}

.stats {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.dashboard-help {
  margin-top: 0;
  color: var(--muted);
}

.stat {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.75rem;
  min-width: 130px;
}

.stat strong {
  display: block;
  font-size: 1.2rem;
}

.weak-subjects-stat {
  flex: 1 1 260px;
}

.weak-subjects-stat strong {
  font-size: 0.95rem;
  line-height: 1.4;
}

.credit-card {
  background: #fff4bf;
  border: 1px solid #f1d972;
  border-radius: 10px;
  padding: 0.6rem 0.8rem;
  text-align: center;
}

.credit-card small {
  color: #6b5200;
  font-weight: 600;
}

.credit-card a {
  color: #8a2b06;
  text-decoration: none;
  border-bottom: 1px dashed #8a2b06;
}

.credit-card a:hover {
  color: #5f1d04;
}

body.dark-mode .credit-card {
  background: #453700;
  border-color: #b9991f;
}

body.dark-mode .credit-card small,
body.dark-mode .credit-card a {
  color: #ffdc66;
}