:root {
  --bg: #f0f0f3;
  --card-bg: #ffffff;
  --card-bg-muted: #f7f7f8;
  --border: #e3e3e6;
  --text: #1c1c1e;
  --text-muted: #8a8a8e;
  --blue-bg: #dbeafe;
  --blue-text: #1d4ed8;
  --green-bg: #d9f7e3;
  --green-text: #16803c;
  --red-text: #d64545;
  --radius: 12px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card-bg: #1c1c1e;
    --card-bg-muted: #161618;
    --border: #2c2c2e;
    --text: #f2f2f2;
    --text-muted: #8e8e93;
    --blue-bg: #16304f;
    --blue-text: #6fa8f5;
    --green-bg: #103d22;
    --green-text: #5fd48a;
    --red-text: #e07070;
  }
}

* { box-sizing: border-box; }

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

.page {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  padding: 16px;
  display: flex;
  flex-direction: column;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.hidden { display: none !important; }

/* Login */
.login-title {
  font-size: 22px;
  font-weight: 600;
  text-align: center;
  margin: 40px 0 24px;
}
#login-form { display: flex; flex-direction: column; gap: 10px; }

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
}
.today-date {
  margin: 0 0 2px;
  font-size: 13px;
  color: var(--text-muted);
}
.app-title {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.sub-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.icon-btn {
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Tabs listes */
.lists-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.list-tab {
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
}
.list-tab.active {
  background: var(--blue-bg);
  color: var(--blue-text);
  border-color: var(--blue-bg);
  font-weight: 600;
}

/* Habit cards */
.habits-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.habit-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
}
.habit-card.muted {
  background: var(--card-bg-muted);
}
.habit-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}
.habit-name {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 4px;
}
.habit-streak {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
}

.btn {
  border: none;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
.btn-full { width: 100%; }
.btn-primary { background: var(--blue-text); color: #fff; }
.btn-secondary { background: var(--card-bg-muted); color: var(--text); border: 1px solid var(--border); }
.btn-danger { background: transparent; color: var(--red-text); border: 1px solid var(--border); }
.btn-text { background: none; color: var(--text-muted); font-weight: 500; text-align: center; padding: 14px; }

.btn-done {
  background: var(--card-bg-muted);
  border: 1px solid var(--border);
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
}
.btn-done.done {
  background: var(--green-bg);
  color: var(--green-text);
  border-color: var(--green-bg);
}
.not-scheduled-label {
  font-size: 13px;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* Ligne des 7 jours */
.week-row {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
}
.week-day {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}
.day-circle {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  color: var(--text-muted);
}
.day-circle.done {
  background: var(--green-bg);
  border-color: var(--green-bg);
  color: var(--green-text);
}
.day-letter {
  font-size: 11px;
  color: var(--text-muted);
}

.empty-state {
  color: var(--text-muted);
  font-size: 14px;
  text-align: center;
  margin-top: 24px;
}

/* Réglages */
.settings-section { margin-bottom: 24px; }
.section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  margin: 0 0 10px;
}
.settings-lists, .settings-habits {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 10px;
}
.settings-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
}
.settings-row .muted { color: var(--text-muted); font-size: 12px; }
.settings-row-actions { display: flex; gap: 8px; }
.link-btn {
  background: none;
  border: none;
  color: var(--blue-text);
  font-size: 13px;
  cursor: pointer;
  padding: 0;
}
.link-btn.danger { color: var(--red-text); }

.inline-form { display: flex; gap: 8px; }
.inline-form input {
  flex: 1;
}

input[type="text"], input[type="password"], select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 14px;
}

.add-habit-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 12px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.add-habit-form label {
  font-size: 12px;
  color: var(--text-muted);
}

.days-picker {
  display: flex;
  justify-content: space-between;
  gap: 4px;
}
.day-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
}
.day-toggle.selected {
  background: var(--blue-bg);
  color: var(--blue-text);
  border-color: var(--blue-bg);
}

.form-actions { display: flex; gap: 8px; }
.form-actions .btn { flex: 1; }

.error {
  color: var(--red-text);
  font-size: 13px;
  margin: 0;
}

/* Détail habitude */
.detail-streak {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 16px;
}
.calendar-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  font-size: 14px;
  font-weight: 600;
}
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 6px;
  margin-bottom: 20px;
}
.cal-cell {
  aspect-ratio: 1;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.cal-cell.scheduled.done {
  background: var(--green-bg);
  color: var(--green-text);
  border-color: var(--green-bg);
}
.cal-cell.scheduled.missed {
  border-color: var(--red-text);
  color: var(--red-text);
}
.cal-cell.empty { border: none; }

.detail-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
}