:root {
  --bg: #1a1a2e;
  --bg-card: #16213e;
  --text: #e0e0e0;
  --text-muted: #8a8a9a;
  --primary: #6c63ff;
  --primary-hover: #5a52d5;
  --border: #2a2a4a;
  --shadow: rgba(0,0,0,0.3);
  --overdue-bg: rgba(220,53,69,0.15);
  --overdue-border: rgba(220,53,69,0.4);
  --today-bg: rgba(255,193,7,0.12);
  --today-border: rgba(255,193,7,0.4);
  --input-bg: #1a1a2e;
}

body.light {
  --bg: #f5f5f7;
  --bg-card: #ffffff;
  --text: #1a1a2e;
  --text-muted: #666;
  --border: #e0e0e0;
  --shadow: rgba(0,0,0,0.08);
  --overdue-bg: rgba(220,53,69,0.08);
  --overdue-border: rgba(220,53,69,0.3);
  --today-bg: rgba(255,193,7,0.08);
  --today-border: rgba(255,193,7,0.3);
  --input-bg: #fff;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  transition: background 0.3s, color 0.3s;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 700px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1rem 0.5rem;
}

header h1 { font-size: 1.8rem; font-weight: 700; }

#theme-toggle {
  background: none;
  border: 2px solid var(--border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  font-size: 1.2rem;
  cursor: pointer;
  transition: border-color 0.3s;
  color: var(--text);
}

main {
  max-width: 700px;
  width: 100%;
  margin: 0 auto;
  padding: 1rem;
  flex: 1;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 0.65rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
  font-weight: 600;
}
.btn-primary:hover { background: var(--primary-hover); }

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 2px solid var(--border);
  padding: 0.6rem 1.5rem;
  border-radius: 8px;
  font-size: 1rem;
  cursor: pointer;
  transition: border-color 0.2s;
}

#new-reminder-btn { margin-bottom: 1rem; }

.hidden { display: none !important; }

#reminder-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 8px var(--shadow);
}

.form-group {
  margin-bottom: 1rem;
}
.form-group label {
  display: block;
  margin-bottom: 0.35rem;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-muted);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--input-bg);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

#reminders-list { display: flex; flex-direction: column; gap: 0.75rem; }

.reminder-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem 1.25rem;
  box-shadow: 0 2px 8px var(--shadow);
  transition: background 0.3s, border-color 0.3s;
}
.reminder-card.overdue {
  background: var(--overdue-bg);
  border-color: var(--overdue-border);
}
.reminder-card.today {
  background: var(--today-bg);
  border-color: var(--today-border);
}
.reminder-card.inactive { opacity: 0.5; }

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.5rem;
}
.card-title { font-size: 1.1rem; font-weight: 600; }
.card-badges { display: flex; gap: 0.4rem; flex-shrink: 0; }

.badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  background: var(--primary);
  color: #fff;
}
.badge.inactive-badge { background: #666; }

.card-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0.4rem 0;
}
.card-due {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}
.card-actions {
  display: flex;
  gap: 0.5rem;
}
.card-actions button {
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.3rem 0.75rem;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: border-color 0.2s;
}
.card-actions button:hover { border-color: var(--primary); }
.card-actions button.delete-btn:hover { border-color: #dc3545; color: #dc3545; }

footer {
  text-align: center;
  padding: 1.5rem 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}