:root {
  --bg: #0f1420;
  --panel: #171e2e;
  --panel-2: #1d2740;
  --border: #2a3552;
  --text: #e7ecf5;
  --muted: #93a0b8;
  --accent: #5b8cff;
  --accent-2: #3f6ae0;
  --red: #ff5d5d;
  --amber: #ffb648;
  --green: #4cc38a;
  --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  font-size: 15px;
  line-height: 1.45;
}

.hidden { display: none !important; }
.muted { color: var(--muted); }
.error { color: var(--red); font-size: 0.9rem; }
.center { text-align: center; }

/* --- login --- */
.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.login-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.login-card h1 { margin: 0; font-size: 1.3rem; }
.login-card p { margin: 0 0 12px; }
.login-card label { font-size: 0.85rem; color: var(--muted); margin-top: 8px; }
.login-card input {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 1rem;
}
.login-card input:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.login-card button {
  margin-top: 16px;
  background: var(--accent);
  border: none;
  color: #fff;
  font-weight: 600;
  border-radius: 8px;
  padding: 11px;
  font-size: 1rem;
  cursor: pointer;
}
.login-card button:hover { background: var(--accent-2); }

/* --- topbar --- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.logo { font-size: 1.2rem; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.user-chip {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.85rem;
}
.btn {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 8px;
  padding: 7px 12px;
  font-size: 0.85rem;
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn.ghost { background: transparent; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn.primary:hover { background: var(--accent-2); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* --- board --- */
.board {
  display: grid;
  grid-template-columns: repeat(3, minmax(280px, 1fr));
  gap: 18px;
  padding: 24px;
  align-items: start;
}
@media (max-width: 980px) {
  .board { grid-template-columns: 1fr; }
}
.column {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  min-height: 200px;
}
.column-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.column-title { font-weight: 700; font-size: 1rem; }
.column-title.todo::before { content: "🔴 "; }
.column-title.doing::before { content: "🟡 "; }
.column-title.done::before { content: "✅ "; }
.column-count {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 999px;
  font-size: 0.78rem;
  padding: 2px 9px;
}
.column-note {
  color: var(--muted);
  font-style: italic;
  font-size: 0.88rem;
  text-align: center;
  padding: 18px 8px;
}
.card {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 10px;
}
.card:last-child { margin-bottom: 0; }
.card-title { font-weight: 650; margin: 0 0 8px; overflow-wrap: anywhere; }
.card-text { color: var(--muted); font-size: 0.9rem; margin: 4px 0; overflow-wrap: anywhere; }
.badges { display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.76rem;
  border-radius: 999px;
  padding: 3px 9px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted);
  overflow-wrap: anywhere;
}
.badge.sender { color: var(--text); }
.badge.deadline.overdue { color: #fff; background: rgba(255, 93, 93, 0.25); border-color: var(--red); }
.badge.deadline.soon { color: #fff; background: rgba(255, 182, 72, 0.2); border-color: var(--amber); }
.badge.delegated { color: #fff; background: rgba(91, 140, 255, 0.25); border-color: var(--accent); }
.checklist { list-style: none; margin: 8px 0 0; padding: 0; }
.checklist li {
  display: flex;
  gap: 8px;
  align-items: baseline;
  font-size: 0.9rem;
  padding: 2px 0;
  overflow-wrap: anywhere;
}
.checklist li.done-item { color: var(--muted); text-decoration: line-through; }
.checkbox {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 1px solid var(--border);
  border-radius: 4px;
  flex: none;
  position: relative;
  top: 1px;
}
.checkbox.checked { background: var(--green); border-color: var(--green); }
.checkbox.checked::after {
  content: "✓";
  color: #08130c;
  font-size: 11px;
  font-weight: 700;
  position: absolute;
  left: 2px;
  top: -1px;
}
.card-actions {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}
.delegate-box {
  margin-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.delegate-box textarea {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 10px;
  font: inherit;
  font-size: 0.9rem;
  min-height: 70px;
  resize: vertical;
}
.delegate-box textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.delegate-row { display: flex; justify-content: flex-end; gap: 8px; }
.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--panel-2);
  border: 1px solid var(--accent);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 0.9rem;
  z-index: 50;
}