:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --hint: #999999;
  --accent: #2678b6;
  --accent-text: #ffffff;
  --secondary-bg: #f0f0f0;
  --warning: #e67e22;
  --danger: #e74c3c;
  --success: #27ae60;
  --blocked: #9b59b6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a1a;
    --text: #e0e0e0;
    --hint: #777777;
    --accent: #4a9ede;
    --accent-text: #ffffff;
    --secondary-bg: #2a2a2a;
    --warning: #f0a030;
    --danger: #e74c3c;
    --success: #2ecc71;
    --blocked: #b07cc8;
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 0 0 80px 0;
}

#app {
  max-width: 560px;
  margin: 0 auto;
  padding: 24px 16px;
}

header { margin-bottom: 20px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
header h1 { font-size: 1.5rem; font-weight: 600; }

#filter-bar { display: flex; gap: 4px; }
.filter-btn {
  padding: 4px 10px;
  border: 1px solid var(--hint);
  border-radius: 6px;
  background: transparent;
  color: var(--hint);
  font-size: 0.75rem;
  cursor: pointer;
}
.filter-btn.active {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

#add-form {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
}

#task-input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--hint);
  border-radius: 10px;
  font-size: 1rem;
  background: var(--secondary-bg);
  color: var(--text);
  outline: none;
}

#task-input:focus {
  border-color: var(--accent);
}

#add-btn {
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 1.4rem;
  font-weight: bold;
  cursor: pointer;
  flex-shrink: 0;
}

#add-btn:hover { opacity: 0.85; }

/* Task items */
.task-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  margin-bottom: 8px;
  background: var(--secondary-bg);
  border-radius: 10px;
  transition: opacity 0.2s;
  border-left: 3px solid transparent;
}

.task-item.status-in_progress { border-left-color: var(--accent); }
.task-item.status-done { opacity: 0.5; border-left-color: var(--success); }
.task-item.status-blocked { border-left-color: var(--blocked); }
.task-item.status-todo { border-left-color: var(--hint); }
.task-item.status-done .task-title { text-decoration: line-through; }

/* Status button */
.task-status-btn {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 2px solid var(--hint);
  background: transparent;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--text);
  margin-top: 2px;
}

.task-status-btn.status-done {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}
.task-status-btn.status-in_progress {
  border-color: var(--accent);
  color: var(--accent);
  font-size: 0.6rem;
}
.task-status-btn.status-blocked {
  border-color: var(--blocked);
  color: var(--blocked);
  font-weight: bold;
}

/* Content */
.task-content { flex: 1; min-width: 0; }
.task-title-row { display: flex; align-items: center; gap: 6px; }
.task-title {
  font-size: 0.95rem;
  word-break: break-word;
}

.task-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 5px;
  font-size: 0.75rem;
  color: var(--hint);
}

.task-due {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 1px 7px;
  border-radius: 4px;
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.01em;
  background: var(--secondary-bg);
  color: var(--text);
  border: 1px solid var(--hint);
}
.task-due::before {
  content: "\1F4C5";
  font-size: 0.7rem;
}
.task-due.overdue {
  color: #fff;
  background: var(--danger);
  border-color: var(--danger);
  font-weight: 700;
}
.task-due.due-today {
  color: #fff;
  background: var(--warning);
  border-color: var(--warning);
  font-weight: 700;
}
.task-due.due-soon {
  color: var(--warning);
  border-color: var(--warning);
  font-weight: 600;
}

.task-completed-at {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 1px 7px;
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--success);
  border: 1px solid var(--success);
}
.task-completed-at::before {
  content: "\2713";
  font-size: 0.65rem;
  font-weight: 700;
}
.task-updated { font-style: italic; }

.task-desc {
  margin-top: 4px;
  font-size: 0.8rem;
  color: var(--hint);
  white-space: pre-line;
  word-break: break-word;
}

/* Actions */
.task-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.task-date-control {
  position: relative;
  width: 34px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--accent);
  border-radius: 7px;
  background: var(--secondary-bg);
  color: var(--accent);
  cursor: pointer;
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 18%, transparent);
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease, transform 0.05s ease;
}
.task-date-control:hover {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}
.task-date-control:active {
  transform: translateY(1px);
}
.task-date-control.has-date {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}
.task-date-icon {
  font-size: 1rem;
  line-height: 1;
  pointer-events: none;
}
.task-date-input {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  border: none;
  opacity: 0.01;
  cursor: pointer;
  z-index: 2;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}
.task-date-input::-webkit-calendar-picker-indicator {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  cursor: pointer;
}
.task-date-input::-webkit-datetime-edit,
.task-date-input::-webkit-clear-button,
.task-date-input::-webkit-inner-spin-button {
  display: none;
}

.task-status-select {
  padding: 2px 4px;
  border: 1px solid var(--hint);
  border-radius: 4px;
  background: var(--secondary-bg);
  color: var(--text);
  font-size: 0.7rem;
  cursor: pointer;
}

/* Edit mode */
.task-edit-btn {
  background: none;
  border: none;
  color: var(--hint);
  font-size: 1rem;
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}
.task-edit-btn:hover { color: var(--accent); }

.task-edit {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.edit-title {
  padding: 6px 10px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  font-size: 0.95rem;
  background: var(--bg);
  color: var(--text);
  outline: none;
}
.edit-desc {
  padding: 6px 10px;
  border: 1px solid var(--hint);
  border-radius: 6px;
  font-size: 0.8rem;
  background: var(--bg);
  color: var(--text);
  resize: vertical;
  outline: none;
  font-family: inherit;
}
.edit-desc:focus { border-color: var(--accent); }
.edit-btns {
  display: flex;
  gap: 6px;
}
.edit-save, .edit-cancel {
  padding: 4px 12px;
  border-radius: 6px;
  border: none;
  font-size: 0.8rem;
  cursor: pointer;
}
.edit-save {
  background: var(--accent);
  color: var(--accent-text);
}
.edit-save:hover { opacity: 0.85; }
.edit-cancel {
  background: var(--secondary-bg);
  color: var(--text);
  border: 1px solid var(--hint);
}
.edit-cancel:hover { opacity: 0.85; }

.task-display { cursor: default; }

.task-delete {
  background: none;
  border: none;
  color: var(--hint);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px;
  line-height: 1;
}

.task-delete:hover { color: var(--danger); }

#empty-state {
  text-align: center;
  color: var(--hint);
  padding: 40px 0;
  font-size: 0.95rem;
}

.hidden { display: none; }