/* ── Variablen ── */
:root {
  --bg:      #f5f5f7;      /* Apple-typischer heller Hintergrund */
  --card:    rgba(255,255,255,0.7); /* Glassmorphism-Karten */
  --border:  rgba(200,200,200,0.6); /* Dezenter Rahmen */
  --accent:  #0071e3;      /* Apple-Blau als Akzentfarbe */
  --text:    #1d1d1f;      /* Dunkle Textfarbe */
  --muted:   #86868b;      /* Gedämpfte Textfarbe */
  --done:    rgba(220,220,220,0.7); /* Erledigt-Hintergrund */
  --shadow:  0 8px 32px rgba(0,0,0,0.08); /* Glassmorphism-Schatten */
}

/* Globale Einstellungen: Box-Modell und Reset */
* { box-sizing: border-box; margin: 0; padding: 0; }

/* Seitenlayout und Grunddesign */
body {
  background: var(--bg);   /* Heller Hintergrund */
  color: var(--text);      /* Dunkle Textfarbe */
  font-family: 'SF Pro Display', 'DM Sans', 'Segoe UI', Arial, sans-serif; /* Apple-Schrift */
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 60px 20px;
}

/* Container für die To-Do-Liste */
.container {
  width: 100%;
  max-width: 520px;
}

/* ── Titel ── */
h1 {
  font-family: 'SF Pro Display', 'Syne', sans-serif;
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  line-height: 1.1;
  margin-bottom: 8px;
  color: var(--text);
}

h1 span { color: var(--accent); }

.subtitle {
  color: var(--muted);
  font-size: 1rem;
  margin-bottom: 36px;
}

/* ── Eingabezeile für neue Aufgaben ── */
.input-row {
  display: flex;
  gap: 10px;
  margin-bottom: 32px;
}

input[type="text"] {
  flex: 1;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 20px;
  color: var(--text);
  font-family: 'SF Pro Display', 'DM Sans', sans-serif;
  font-size: 1.05rem;
  outline: none;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent);
}

input[type="text"]::placeholder { color: var(--muted); }

button.add-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 14px;
  padding: 16px 28px;
  font-family: 'SF Pro Display', 'Syne', sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.1s, opacity 0.2s, box-shadow 0.2s;
}

button.add-btn:hover  { opacity: 0.92; box-shadow: 0 4px 16px rgba(0,113,227,0.12); }
button.add-btn:active { transform: scale(0.97); }

/* ── Statistik-Zähler ── */
.stats {
  display: flex;
  gap: 24px;
  margin-bottom: 20px;
}

.stat {
  font-size: 0.9rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.stat strong {
  color: var(--accent);
  font-family: 'SF Pro Display', 'Syne', sans-serif;
  font-size: 1.15rem;
  display: block;
}

/* ── Aufgabenliste ── */
#todo-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.todo-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  animation: slideIn 0.25s ease;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.todo-item:hover { border-color: var(--accent); box-shadow: 0 8px 32px rgba(0,113,227,0.08); }

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Checkbox für Erledigt-Status */
.todo-item input[type="checkbox"] {
  appearance: none;
  width: 22px;
  height: 22px;
  border: 2px solid var(--muted);
  border-radius: 8px;
  cursor: pointer;
  flex-shrink: 0;
  position: relative;
  background: #fff;
  transition: border-color 0.2s, background 0.2s;
}

.todo-item input[type="checkbox"]:checked {
  background: var(--accent);
  border-color: var(--accent);
}

.todo-item input[type="checkbox"]:checked::after {
  content: '✓';
  position: absolute;
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* Text der Aufgabe */
.todo-text {
  flex: 1;
  font-size: 1.05rem;
  font-family: 'SF Pro Display', 'DM Sans', sans-serif;
  transition: color 0.2s;
}

.todo-item.done {
  background: var(--done);
  border-color: var(--border);
}

.todo-item.done .todo-text {
  text-decoration: line-through;
  color: var(--muted);
}

/* Löschen-Button */
.delete-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
  line-height: 1;
}

.delete-btn:hover {
  color: #ff5f5f;
  background: rgba(255,95,95,0.08);
}

/* ── Leer-Zustand ── */
.empty {
  text-align: center;
  color: var(--muted);
  padding: 40px 0;
  font-size: 1rem;
}
.empty span { font-size: 2.2rem; display: block; margin-bottom: 8px; }