:root {
  --bg: #0f1117;
  --card: #1a1d27;
  --border: #2a2e3a;
  --text: #e8e9ed;
  --muted: #9098a8;
  --accent: #6c8cff;
  --todo: #6c8cff;
  --doing: #ffb86c;
  --done: #63d68a;
  --danger: #ff6b6b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  padding: 24px 16px 64px;
}

.app { max-width: 900px; margin: 0 auto; }

header h1 { margin: 0 0 4px; font-size: 1.6rem; }
.subtitle { margin: 0 0 20px; color: var(--muted); font-size: 0.85rem; }

.progress-section { margin-bottom: 20px; }
.progress-bar {
  width: 100%;
  height: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--done));
  transition: width 0.2s ease;
}
.progress-label { margin-top: 6px; font-size: 0.9rem; color: var(--muted); }
#progress-text { color: var(--text); font-weight: 600; }

.add-form { display: flex; gap: 8px; margin-bottom: 8px; flex-wrap: wrap; }
.add-form input[type="text"] {
  flex: 1;
  min-width: 200px;
  padding: 10px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-size: 1rem;
}
.add-form input[type="date"] {
  padding: 10px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
}
.add-form button {
  padding: 10px 20px;
  border-radius: 6px;
  border: none;
  background: var(--accent);
  color: #0f1117;
  font-weight: 700;
  cursor: pointer;
}
.add-form button:hover { opacity: 0.9; }

.error-msg {
  color: var(--danger);
  font-size: 0.85rem;
  margin: 4px 0 12px;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 20px;
}
@media (max-width: 720px) {
  .board { grid-template-columns: 1fr; }
}

.column {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  min-height: 120px;
}
.column h2 {
  font-size: 0.95rem;
  margin: 0 0 10px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
}
.column[data-status="todo"] h2 { color: var(--todo); }
.column[data-status="doing"] h2 { color: var(--doing); }
.column[data-status="done"] h2 { color: var(--done); }
.count {
  background: rgba(255,255,255,0.08);
  border-radius: 10px;
  padding: 0 8px;
  font-size: 0.8rem;
}

.task-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }

.task-item {
  background: #14161f;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
}
.task-main { display: flex; flex-direction: column; gap: 2px; margin-bottom: 8px; }
.task-title { font-size: 0.95rem; word-break: break-word; }
.task-due { font-size: 0.75rem; color: var(--muted); }

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

.task-actions { display: flex; gap: 6px; }
.task-actions button {
  flex: 1;
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font-size: 0.78rem;
  cursor: pointer;
}
.btn-status:hover { border-color: var(--accent); color: var(--accent); }
.btn-delete:hover { border-color: var(--danger); color: var(--danger); }

.empty-state {
  text-align: center;
  color: var(--muted);
  margin-top: 40px;
  line-height: 1.6;
}