:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #18191b;
  --muted: #6b7280;
  --line: #e6e8eb;
  --accent: #4f5dd3;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  -webkit-font-smoothing: antialiased;
}

.vk-wrap { max-width: 1080px; margin: 0 auto; padding: 48px 24px; }
.vk-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 32px;
}
.vk-title { font-size: 22px; font-weight: 600; margin: 0 0 4px; }
.vk-sub { color: var(--muted); font-size: 13px; margin: 0 0 24px; line-height: 1.6; }
label { display: block; font-size: 13px; color: var(--muted); margin: 16px 0 6px; }

input[type='password'], input[type='text'], input[type='date'], textarea {
  width: 100%;
  padding: 10px 12px;
  font-size: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-family: inherit;
}
textarea { resize: vertical; }
input:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79, 93, 211, 0.15);
}

button {
  margin-top: 20px;
  width: 100%;
  padding: 11px 16px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  cursor: pointer;
}
button:hover { filter: brightness(1.05); }
button:disabled { opacity: 0.6; cursor: not-allowed; }

.vk-err { color: #d4352a; font-size: 13px; margin-top: 12px; }
.vk-table { width: 100%; border-collapse: collapse; margin-top: 16px; }
.vk-table th, .vk-table td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}
.vk-table th { color: var(--muted); font-weight: 500; }
.vk-empty { color: var(--muted); padding: 24px; text-align: center; }
.vk-row-actions { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }

.vk-actions { white-space: nowrap; }
.vk-btn-sm { width: auto; margin: 0 4px 0 0; padding: 5px 10px; font-size: 12px; font-weight: 500; }
.vk-btn-danger { background: #d4352a; }
.vk-btn-ghost { background: transparent; color: var(--muted); border: 1px solid var(--line); }
.vk-btn-ghost:hover { filter: none; background: var(--bg); }
.vk-btn-row { display: flex; gap: 10px; margin-top: 20px; }
.vk-btn-row button { width: auto; flex: 1; margin: 0; }

.vk-modal-backdrop {
  position: fixed; inset: 0; background: rgba(24, 25, 27, 0.45);
  display: flex; align-items: center; justify-content: center; padding: 24px; z-index: 50;
}
.vk-modal {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 28px; width: 100%; max-width: 440px; max-height: 90vh; overflow: auto;
}

/* M2：视图切换 */
.vk-tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--line); margin: 8px 0 16px; }
.vk-tab {
  width: auto; margin: 0; padding: 9px 16px; border-radius: 8px 8px 0 0;
  background: transparent; color: var(--muted); font-weight: 500;
}
.vk-tab:hover { filter: none; background: var(--bg); }
.vk-tab.active { color: var(--accent); border-bottom: 2px solid var(--accent); }
.vk-hint { color: var(--muted); font-size: 12px; line-height: 1.6; margin-bottom: 12px; }
.vk-tag {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  background: rgba(79, 93, 211, 0.1); color: var(--accent); font-size: 12px;
}

/* M2：看板 */
.vk-board { display: flex; gap: 12px; overflow-x: auto; padding-bottom: 8px; align-items: flex-start; }
.vk-board-col {
  flex: 1 0 200px; min-width: 200px; background: var(--bg);
  border: 1px solid var(--line); border-radius: 10px; padding: 10px;
}
.vk-board-col.drop-target { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(79, 93, 211, 0.12); }
.vk-board-head {
  font-size: 13px; font-weight: 600; padding: 2px 4px 10px;
  display: flex; justify-content: space-between; align-items: center;
}
.vk-board-count { color: var(--muted); font-weight: 400; font-size: 12px; }
.vk-board-body { min-height: 60px; }
.vk-board-empty { color: var(--muted); font-size: 12px; text-align: center; padding: 16px 0; border: 1px dashed var(--line); border-radius: 8px; }
.vk-board-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 8px;
  padding: 10px; margin-bottom: 8px; cursor: grab;
}
.vk-board-card.dragging { opacity: 0.45; }
.vk-board-name { font-size: 13px; font-weight: 600; margin-bottom: 4px; }
.vk-board-meta { font-size: 12px; color: var(--muted); word-break: break-all; }
.vk-board-foot { font-size: 11px; color: var(--muted); margin-top: 4px; }
.vk-board-card .vk-btn-sm { margin-top: 8px; }

/* M2：日历 */
.vk-cal-bar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.vk-cal-bar .vk-btn-sm { margin: 0; }
.vk-cal-title { font-size: 15px; font-weight: 600; }
.vk-cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 6px; }
.vk-cal-wd { text-align: center; color: var(--muted); font-size: 12px; padding: 4px 0; }
.vk-cal-cell {
  min-height: 78px; border: 1px solid var(--line); border-radius: 8px;
  padding: 6px; background: var(--surface); cursor: pointer;
}
.vk-cal-cell.blank { background: transparent; border-color: transparent; cursor: default; }
.vk-cal-cell.has { border-color: rgba(79, 93, 211, 0.35); }
.vk-cal-cell:hover:not(.blank) { background: var(--bg); }
.vk-cal-day { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.vk-cal-item {
  font-size: 11px; padding: 3px 6px; margin-top: 3px; border-radius: 4px;
  background: rgba(79, 93, 211, 0.1); color: var(--accent);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

/* M2：文档 */
.vk-docs { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.vk-doc { border: 1px solid var(--line); border-radius: 10px; padding: 18px; }
.vk-doc h3 { font-size: 15px; margin: 0 0 6px; }
.vk-doc-meta { font-size: 12px; color: var(--muted); margin-bottom: 12px; }
.vk-doc-fields { display: grid; grid-template-columns: 48px 1fr; gap: 6px 10px; font-size: 12px; margin: 0 0 12px; }
.vk-doc-fields dt { color: var(--muted); margin: 0; }
.vk-doc-fields dd { margin: 0; word-break: break-all; }

@media (max-width: 640px) {
  .vk-wrap { padding: 20px 12px; }
  .vk-card { padding: 20px; }
  .vk-row-actions { flex-wrap: wrap; gap: 8px; }
  .vk-board-col { flex-basis: 170px; min-width: 170px; }
  .vk-cal-cell { min-height: 58px; }
}