/* Bảng công việc — theme tokens (sáng/tối theo hệ thống, không toggle) */
:root {
  color-scheme: light dark;
  --bg: #f2f4f7;
  --surface: #ffffff;
  --surface-2: #eef0f4;
  --text: #1f2328;
  --muted: #667085;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.12);
  --danger: #dc2626;
  --border: #e4e7ec;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.12);
  --radius: 10px;
  /* Dải Eisenhower đỏ -> xanh: điểm = quan trọng×2 + gấp×1 */
  --q-do: #dc2626;        /* 3 — Làm ngay */
  --q-schedule: #ea580c;  /* 2 — Lên lịch */
  --q-delegate: #ca8a04;  /* 1 — Giao việc */
  --q-eliminate: #16a34a; /* 0 — Bỏ bớt */
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171c;
    --surface: #21242b;
    --surface-2: #2a2e37;
    --text: #e6e8eb;
    --muted: #98a2b3;
    --accent: #60a5fa;
    --accent-soft: rgba(96, 165, 250, 0.16);
    --danger: #f87171;
    --border: #333843;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.55);
    --q-do: #f87171;
    --q-schedule: #fb923c;
    --q-delegate: #facc15;
    --q-eliminate: #4ade80;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.topbar { padding: 14px 20px 10px; flex: none; }
.topbar h1 { margin: 0; font-size: 20px; font-weight: 700; letter-spacing: -0.01em; }

#banner {
  flex: none;
  background: var(--danger);
  color: #fff;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 600;
}
#banner[hidden] { display: none; }
#banner.banner-due {
  background: var(--q-schedule);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.banner-close {
  border: none;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 14px;
  line-height: 1;
  padding: 2px 6px;
  cursor: pointer;
  opacity: 0.85;
}
.banner-close:hover { opacity: 1; }

#board {
  flex: 1;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 4px 20px 20px;
  overflow-x: auto;
  overflow-y: hidden;
}

.column {
  flex: 0 0 280px;
  display: flex;
  flex-direction: column;
  background: var(--surface-2);
  border-radius: var(--radius);
  max-height: 100%;
  min-height: 80px;
}

.column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 10px 6px 14px;
}

.column-title {
  margin: 0;
  font-size: 14px;
  font-weight: 700;
  cursor: grab;
  flex: 1;
  touch-action: none;
}

.column-title-input,
.add-column input,
.add-card input {
  font: inherit;
  font-weight: 700;
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--surface);
  color: var(--text);
  width: 100%;
}

.wip-badge {
  flex: none;
  font: inherit;
  font-size: 11px;
  color: var(--muted);
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: 6px;
  padding: 2px 6px;
  cursor: pointer;
}
.wip-badge:hover { color: var(--accent); border-color: var(--accent); }
.wip-limit-input {
  width: 56px;
  flex: none;
  font: inherit;
  font-size: 12px;
  padding: 4px 6px;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--surface);
  color: var(--text);
}
.column-over-limit { outline: 1px solid var(--danger); }
.column-over-limit .wip-badge { color: var(--danger); border-color: var(--danger); }

.icon-btn {
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  padding: 4px 6px;
  border-radius: 6px;
}
.icon-btn:hover { background: var(--border); color: var(--danger); }

.card-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 4px 10px;
  overflow-y: auto;
  min-height: 4px;
}

.card {
  background: var(--surface);
  border-radius: 8px;
  padding: 10px 12px;
  box-shadow: var(--shadow);
  cursor: pointer;
  touch-action: none;
  user-select: none;
}
.card:hover { outline: 1px solid var(--accent-soft); }
.card-title { font-size: 13px; font-weight: 600; white-space: pre-wrap; word-break: break-word; }
.card-desc { margin-top: 4px; font-size: 12px; color: var(--muted); white-space: pre-wrap; word-break: break-word; }

/* Viền trái theo ô Eisenhower — thẻ chưa phân loại không có viền màu */
.card.q-do { border-left: 4px solid var(--q-do); }
.card.q-schedule { border-left: 4px solid var(--q-schedule); }
.card.q-delegate { border-left: 4px solid var(--q-delegate); }

.card-tags { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 6px; }
.tag {
  font-size: 11px;
  font-weight: 600;
  line-height: 1;
  padding: 3px 6px;
  border-radius: 4px;
  border: 1px solid currentColor;
  color: var(--muted);
}
.tag-do { color: var(--q-do); }
.tag-schedule { color: var(--q-schedule); }
.tag-delegate { color: var(--q-delegate); }
.due-overdue, .due-today { color: var(--danger); }
.due-soon { color: var(--q-schedule); }
.due-later { color: var(--muted); }

.card-meta-editor { display: flex; flex-direction: column; gap: 6px; margin-bottom: 6px; }
.field-inline {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
}
.field-inline input[type="date"] {
  flex: 1;
  margin-bottom: 0;
  font-size: 12px;
}
.card-flags { display: flex; gap: 12px; }
.field-check {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--text);
  cursor: pointer;
}
.field-check input[type="checkbox"] { width: auto; margin: 0; cursor: pointer; }

.card-editing { cursor: default; user-select: text; touch-action: auto; }
.card-editing input,
.card-editing textarea {
  width: 100%;
  font: inherit;
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  margin-bottom: 6px;
  resize: vertical;
}
.card-editor-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.card-editor-actions button,
.inline-actions button {
  font: inherit;
  font-size: 12px;
  padding: 5px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}
.card-editor-actions button[data-action="save-card"],
.inline-actions button[data-action^="confirm"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.card-editor-actions button.danger { color: var(--danger); margin-left: auto; }

.add-card, .add-column { padding: 8px 10px 12px; flex: none; }
.add-column { flex: 0 0 220px; }
.inline-actions { display: flex; gap: 6px; margin-top: 6px; }

.ghost-btn {
  width: 100%;
  text-align: left;
  font: inherit;
  font-size: 13px;
  color: var(--muted);
  background: transparent;
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
}
.ghost-btn:hover { color: var(--accent); border-color: var(--accent); }

#toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 13px;
  box-shadow: var(--shadow);
  max-width: min(90vw, 420px);
}
#toast[hidden] { display: none; }
#toast.toast-error { background: var(--danger); color: #fff; }

.card-drag-hidden { visibility: hidden; }
.card-ghost {
  opacity: 0.92;
  box-shadow: 0 8px 20px rgba(16, 24, 40, 0.28);
  z-index: 1000;
  transform: rotate(1deg);
}
.drop-indicator {
  position: fixed;
  height: 3px;
  border-radius: 2px;
  background: var(--accent);
  z-index: 999;
  pointer-events: none;
}

.column-drag-hidden { visibility: hidden; }
.column-ghost {
  background: var(--surface-2);
  border-radius: var(--radius);
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 8px 20px rgba(16, 24, 40, 0.28);
  opacity: 0.92;
  z-index: 1000;
}
.drop-indicator-col {
  width: 3px;
  height: auto;
}

/* ----- cổng vào: đăng nhập / chưa cấp quyền (chỉ hiện ở chế độ web) ----- */
#gate { display: flex; justify-content: center; padding: 48px 20px; }
/* BẮT BUỘC: selector #gate (đặc hiệu 1,0,0) thắng quy tắc [hidden]{display:none} của trình
 * duyệt (0,1,0), nên nếu thiếu dòng này thì cổng đã ẩn VẪN chiếm 96px trống trên bảng. */
#gate[hidden] { display: none; }
.gate-box {
  max-width: 420px;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
}
.gate-box h2 { margin: 0 0 12px; font-size: 18px; }
.gate-box p { margin: 0 0 24px; color: var(--muted); font-size: 14px; line-height: 1.5; }
.gate-btn {
  font: inherit;
  cursor: pointer;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
}
/* .topbar đã có padding ở trên; đây chỉ thêm bố cục ngang cho thanh tài khoản. */
.topbar { display: flex; align-items: center; gap: 12px; }
.account {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--muted);
}
.account-btn {
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
}
@media (prefers-color-scheme: dark) {
  /* --accent chế độ tối là xanh nhạt (#60a5fa), chữ trắng trên nền đó đọc không nổi. */
  .gate-btn { color: #10131a; }
}

/* ----- ô chuyển dữ liệu từ bản trên máy lên bảng chung ----- */
.import-box {
  margin: 0 20px 12px;
  padding: 16px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: none;
}
.import-box p { margin: 0; font-size: 13px; color: var(--muted); }
.import-box textarea {
  font: inherit;
  font-size: 13px;
  padding: 8px;
  resize: vertical;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
}
.import-box .gate-btn { align-self: flex-start; }