:root {
  --bg: #0b0d12;
  --bg-soft: #11141c;
  --surface: #161a24;
  --surface-2: #1d2230;
  --border: #262c3b;
  --text: #e6e9f2;
  --muted: #8b93a7;
  --accent: #6d8bff;
  --accent-strong: #8aa2ff;
  --danger: #ff6b6b;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  background:
    radial-gradient(1100px 600px at 12% -10%, #1b2340 0%, transparent 60%),
    radial-gradient(900px 500px at 95% 0%, #241b3d 0%, transparent 55%),
    var(--bg);
  color: var(--text);
  font: 15px/1.5 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { margin: 0; font-weight: 650; letter-spacing: -0.01em; }

/* ------------------------------------------------------------------ shared */

.brand { display: flex; align-items: center; gap: 10px; }
.brand h1 { font-size: 18px; }

.brand-mark {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--accent), #b06dff);
  box-shadow: 0 0 16px rgba(109, 139, 255, 0.7);
}

.btn {
  font: inherit;
  font-weight: 600;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 9px 14px;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.05s ease;
}
.btn:hover { background: #252b3c; border-color: #333b4f; }
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: linear-gradient(180deg, var(--accent-strong), var(--accent));
  border-color: transparent;
  color: #0b0d12;
}
.btn.primary:hover { filter: brightness(1.07); }
.btn.ghost { background: transparent; }
.btn.block { width: 100%; }

input, textarea {
  font: inherit;
  width: 100%;
  color: var(--text);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 10px 12px;
  outline: none;
  resize: vertical;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
input::placeholder, textarea::placeholder { color: #5f677c; }
input:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(109, 139, 255, 0.18);
}

/* ------------------------------------------------------------------- login */

.login-body {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 24px;
}

.login-card {
  width: 100%;
  max-width: 380px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 28px;
}
.login-card .subtitle { color: var(--muted); margin: 12px 0 20px; }
.login-card label {
  display: block;
  margin: 14px 0 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}
.login-card button { margin-top: 20px; }
.login-card .hint { margin: 18px 0 0; font-size: 13px; color: var(--muted); text-align: center; }
.login-card code {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 5px;
}

.error {
  margin: 0 0 6px;
  padding: 10px 12px;
  border-radius: 9px;
  background: rgba(255, 107, 107, 0.12);
  border: 1px solid rgba(255, 107, 107, 0.35);
  color: #ffb3b3;
  font-size: 14px;
}

/* ------------------------------------------------------------------- board */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(11, 13, 18, 0.75);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.topbar-right { display: flex; align-items: center; gap: 12px; }
.user {
  font-size: 13px;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px 12px;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, minmax(260px, 1fr));
  gap: 18px;
  padding: 24px;
  align-items: start;
}

.column {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 220px;
}

.column-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.column-title { font-size: 14px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.count {
  font-size: 12px;
  color: var(--muted);
  background: var(--surface-2);
  border-radius: 999px;
  padding: 2px 9px;
}

.cards {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 60px;
  border-radius: 10px;
  transition: background 0.15s ease, outline-color 0.15s ease;
  outline: 1px dashed transparent;
}
.cards.dragover {
  background: rgba(109, 139, 255, 0.07);
  outline-color: rgba(109, 139, 255, 0.5);
  outline-offset: 4px;
}

.card {
  position: relative;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 12px 34px 12px 12px;
  cursor: grab;
  transition: transform 0.1s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}
.card:hover { border-color: #39415a; box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35); }
.card:active { cursor: grabbing; }
.card.dragging { opacity: 0.45; transform: rotate(1.5deg); }
.card-title { font-size: 15px; word-break: break-word; }
.card-desc {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--muted);
  white-space: pre-wrap;
  word-break: break-word;
}
.card-desc:empty { display: none; }

.card-delete {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 24px;
  height: 24px;
  font-size: 18px;
  line-height: 1;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 6px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.card:hover .card-delete { opacity: 1; }
.card-delete:hover { color: var(--danger); background: rgba(255, 107, 107, 0.12); }

.drop-placeholder {
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(109, 139, 255, 0.8);
}

.add-form { display: flex; flex-direction: column; gap: 8px; }
.add-form textarea { display: none; }
.add-form.expanded textarea { display: block; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translate(-50%, 20px);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 16px;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.error { border-color: rgba(255, 107, 107, 0.5); color: #ffb3b3; }

@media (max-width: 860px) {
  .board { grid-template-columns: 1fr; }
}