:root {
  --bg: #0f0f11;
  --card: #1a1a1d;
  --card-2: #202024;
  --border: #2c2c31;
  --text: #f2f2f2;
  --text-dim: #9a9aa2;
  --accent: #5b8cff;
  --accent-dim: #2c3b63;
  --done: #4caf6d;
  --danger: #e05a5a;
  --radius: 14px;
}

* { 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;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.hidden { display: none !important; }

/* ---- Auth screen ---- */
#auth-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 360px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
}

.auth-card h1 { margin: 0 0 6px; font-size: 22px; }
.auth-card .sub { color: var(--text-dim); font-size: 14px; margin: 0 0 20px; }

#auth-form, #otp-form { display: flex; flex-direction: column; gap: 10px; }

#otp-form { margin-top: 10px; }

#auth-form input, #otp-form input {
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-2);
  color: var(--text);
  font-size: 16px;
}

#otp-code {
  text-align: center;
  letter-spacing: 0.3em;
}

#auth-form button, #otp-form button {
  padding: 12px 14px;
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: white;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}

.status { min-height: 18px; font-size: 13px; color: var(--text-dim); margin-top: 12px; }

/* ---- App shell ---- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(16px + env(safe-area-inset-top)) 20px 16px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 5;
}

.topbar h1 { font-size: 18px; margin: 0; }

.ghost-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 8px 12px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
}
.ghost-btn:hover { color: var(--text); border-color: var(--accent); }

.board {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: 16px 16px calc(16px + env(safe-area-inset-bottom));
  max-width: 1100px;
  margin: 0 auto;
}

@media (min-width: 820px) {
  .board { grid-template-columns: repeat(3, 1fr); gap: 20px; padding: 24px 24px calc(24px + env(safe-area-inset-bottom)); }
}

.column {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  min-height: 160px;
}

.column h2 {
  font-size: 15px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  margin: 0 0 12px;
}

.add-form { display: flex; gap: 8px; margin-bottom: 12px; }

.add-form input {
  flex: 1;
  padding: 10px 12px;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--card-2);
  color: var(--text);
  font-size: 15px;
  min-width: 0;
}

.add-form button {
  padding: 0 16px;
  border-radius: 9px;
  border: none;
  background: var(--accent);
  color: white;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
}

.task-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.task {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 10px 10px 12px;
}

.task input[type="checkbox"] {
  width: 19px;
  height: 19px;
  flex-shrink: 0;
  accent-color: var(--done);
  cursor: pointer;
}

.task .title {
  flex: 1;
  font-size: 14.5px;
  word-break: break-word;
  cursor: default;
}

.task.completed .title {
  color: var(--text-dim);
  text-decoration: line-through;
}

.task .actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.task .icon-btn {
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-size: 15px;
  cursor: pointer;
  padding: 4px 6px;
  border-radius: 6px;
  line-height: 1;
}

.task .icon-btn:hover { color: var(--text); background: rgba(255,255,255,0.06); }
.task .icon-btn.delete:hover { color: var(--danger); }
.task .icon-btn.promote:hover { color: var(--accent); }

.clear-btn {
  margin-top: 10px;
  align-self: flex-start;
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 12.5px;
  cursor: pointer;
  padding: 4px 0;
}
.clear-btn:hover { color: var(--text); }

.empty-hint {
  color: var(--text-dim);
  font-size: 13px;
  padding: 8px 2px;
}