:root {
  --bg: #f6f5f2;
  --card: #ffffff;
  --ink: #1c1b19;
  --muted: #6b6a66;
  --accent: #2f6f4f;
  --accent-ink: #ffffff;
  --border: #e4e2dc;
  --danger: #b3413b;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181a;
    --card: #212327;
    --ink: #ecebe8;
    --muted: #9b9a96;
    --accent: #4d9b73;
    --accent-ink: #0b1210;
    --border: #33353a;
    --danger: #e0665f;
  }
}

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

.login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px;
  width: 320px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.login-card h1 { margin: 0 0 8px; font-size: 22px; }
.login-card label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
.login-card input {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--ink);
  font-size: 14px;
}
.login-card button {
  margin-top: 6px;
  padding: 10px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
  cursor: pointer;
}
.error { color: var(--danger); font-size: 13px; margin: 0; }

.topbar {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--card);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { font-weight: 700; }
.tabs { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }
.tab-btn {
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
}
.tab-btn.active, .tab-btn:hover { background: var(--bg); color: var(--ink); }
.ghost-btn {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
}

#app { max-width: 780px; margin: 0 auto; padding: 24px; display: flex; flex-direction: column; gap: 20px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
}
.card h2 { margin: 0 0 12px; font-size: 16px; }

.stat-row { display: flex; gap: 12px; flex-wrap: wrap; }
.stat {
  flex: 1;
  min-width: 120px;
  background: var(--bg);
  border-radius: 10px;
  padding: 14px;
  text-align: center;
}
.stat .num { font-size: 24px; font-weight: 700; }
.stat .label { font-size: 12px; color: var(--muted); }

.progress-bar { height: 8px; border-radius: 4px; background: var(--bg); overflow: hidden; margin-top: 10px; }
.progress-bar > div { height: 100%; background: var(--accent); }

.checklist-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.checklist-item:last-child { border-bottom: none; }
.checklist-item.done .focus { text-decoration: line-through; color: var(--muted); }
.checklist-item input[type=checkbox] { width: 18px; height: 18px; cursor: pointer; flex-shrink: 0; }
.checklist-item .day-label { font-weight: 600; width: 70px; flex-shrink: 0; font-size: 13px; color: var(--muted); }
.checklist-item .focus { flex: 1; font-size: 14px; }

.week-picker { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.week-picker button {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--ink);
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
}
.week-picker button.active { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

.resource-group h3 { font-size: 13px; color: var(--muted); margin: 14px 0 6px; text-transform: uppercase; letter-spacing: .04em; }
.resource-group ul { margin: 0; padding-left: 18px; font-size: 14px; }
.resource-group a { color: var(--accent); text-decoration: none; }
.resource-group a:hover { text-decoration: underline; }

textarea, input[type=text], input[type=number] {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--ink);
  font-size: 14px;
  font-family: inherit;
}
textarea { min-height: 90px; resize: vertical; }

.form-row { display: flex; gap: 10px; margin-bottom: 10px; }
.form-row > * { flex: 1; }

button.primary {
  border: none;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 9px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
}

.vocab-card, .journal-entry, .test-entry {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  margin-bottom: 10px;
}
.vocab-card .word { font-weight: 700; }
.vocab-card .example { color: var(--muted); font-size: 13px; margin-top: 4px; }
.grade-row { display: flex; gap: 6px; margin-top: 10px; }
.grade-row button {
  flex: 1;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--ink);
  padding: 6px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
}
.grade-row button.again { color: var(--danger); }

.exercise {
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.exercise:last-of-type { border-bottom: none; }
.exercise input[type=text] { max-width: 260px; }
.mcq-option { display: flex; align-items: center; gap: 6px; font-size: 14px; cursor: pointer; }
.exercise .verdict { font-size: 16px; }

.muted { color: var(--muted); font-size: 13px; }
.entry-meta { color: var(--muted); font-size: 12px; margin-bottom: 6px; }