:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --border: #e2e5ea;
  --text: #1f2328;
  --text-muted: #6b7280;
  --accent: #3762f0;
  --accent-hover: #2c50cc;
  --danger: #d84343;
  --radius: 8px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; background: var(--bg); color: var(--text); }
.hidden { display: none !important; }
button { font-family: inherit; cursor: pointer; }
input, select { font-family: inherit; }

/* ---------- Login ---------- */
.login-screen {
  height: 100%; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(180deg, #eef1f8, #f6f7f9);
}
.login-card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 32px; width: 320px; box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}
.login-card h1 { margin: 0 0 4px; font-size: 22px; }
.login-card .subtitle { margin: 0 0 20px; color: var(--text-muted); font-size: 14px; }
.login-card label { display: block; font-size: 13px; margin: 12px 0 4px; color: var(--text-muted); }
.login-card input {
  width: 100%; padding: 9px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px;
}
.login-card button[type="submit"] {
  margin-top: 20px; width: 100%; padding: 10px; background: var(--accent); color: #fff;
  border: none; border-radius: 6px; font-size: 14px; font-weight: 600;
}
.login-card button[type="submit"]:hover { background: var(--accent-hover); }
.error-text { color: var(--danger); font-size: 13px; min-height: 16px; margin-top: 8px; }

/* ---------- App layout ---------- */
.app { display: flex; height: 100vh; overflow: hidden; }
.menu-toggle {
  display: none; position: fixed; top: 10px; left: 10px; z-index: 30;
  background: var(--panel); border: 1px solid var(--border); border-radius: 6px;
  width: 36px; height: 36px; font-size: 16px;
}
.sidebar {
  width: 240px; flex-shrink: 0; background: var(--panel); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; padding: 16px 12px;
}
.sidebar-header { padding: 4px 8px 16px; }
.brand { font-weight: 700; font-size: 16px; }
.table-list { flex: 1; overflow-y: auto; }
.table-item {
  display: flex; align-items: center; justify-content: space-between; padding: 8px 10px;
  border-radius: 6px; cursor: pointer; font-size: 14px; color: var(--text);
}
.table-item:hover { background: var(--bg); }
.table-item.active { background: #e8edfd; color: var(--accent); font-weight: 600; }
.add-table-btn {
  margin-top: 8px; padding: 8px 10px; background: none; border: 1px dashed var(--border);
  border-radius: 6px; color: var(--text-muted); font-size: 13px; text-align: left;
}
.add-table-btn:hover { border-color: var(--accent); color: var(--accent); }
.sidebar-footer { position: relative; border-top: 1px solid var(--border); padding-top: 10px; margin-top: 10px; }
.user-menu-btn {
  width: 100%; text-align: left; padding: 8px 10px; background: none; border: none;
  border-radius: 6px; font-size: 13px; color: var(--text);
}
.user-menu-btn:hover { background: var(--bg); }
.user-menu {
  position: absolute; bottom: 44px; left: 0; right: 0; background: var(--panel);
  border: 1px solid var(--border); border-radius: 8px; box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  overflow: hidden;
}
.user-menu button {
  display: block; width: 100%; text-align: left; padding: 10px 12px; background: none; border: none;
  font-size: 13px; color: var(--text); border-bottom: 1px solid var(--border);
}
.user-menu button:last-child { border-bottom: none; color: var(--danger); }
.user-menu button:hover { background: var(--bg); }

.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; padding: 20px 24px; }
.empty-state { margin: auto; text-align: center; color: var(--text-muted); }
.empty-state h2 { color: var(--text); margin-bottom: 6px; }

.table-view { display: flex; flex-direction: column; height: 100%; overflow: hidden; }
.toolbar { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; }
.table-title-input {
  font-size: 20px; font-weight: 700; border: none; background: none; padding: 4px 6px;
  border-radius: 6px; min-width: 120px; flex: 0 1 260px;
}
.table-title-input:hover, .table-title-input:focus { background: var(--panel); outline: 1px solid var(--border); }
.search-box {
  flex: 1 1 200px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 13px;
}
.toolbar-btn {
  padding: 8px 12px; border: 1px solid var(--border); background: var(--panel); border-radius: 6px; font-size: 13px;
}
.toolbar-btn:hover { border-color: var(--accent); color: var(--accent); }
.toolbar-btn.danger:hover { border-color: var(--danger); color: var(--danger); }

.grid-wrap { flex: 1; overflow: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--panel); }
table.grid { border-collapse: collapse; width: 100%; font-size: 13px; }
table.grid th, table.grid td {
  border-bottom: 1px solid var(--border); border-right: 1px solid var(--border);
  padding: 0; text-align: left; white-space: nowrap;
}
table.grid th { background: #fafbfc; position: sticky; top: 0; z-index: 2; }
.th-inner { display: flex; align-items: center; justify-content: space-between; gap: 6px; padding: 9px 10px; cursor: pointer; user-select: none; }
.th-inner:hover { background: #f0f2f6; }
.th-name { font-weight: 600; }
.th-sort { color: var(--text-muted); font-size: 11px; }
.add-col-cell { width: 40px; text-align: center; }
.add-col-btn { background: none; border: none; color: var(--text-muted); font-size: 16px; padding: 8px; width: 100%; }
.add-col-btn:hover { color: var(--accent); }

td .cell-input {
  width: 100%; min-width: 110px; border: none; background: none; padding: 8px 10px; font-size: 13px; color: var(--text);
}
td .cell-input:focus { outline: 2px solid var(--accent); outline-offset: -2px; background: #fff; }
td.checkbox-cell { text-align: center; }
.row-actions { width: 36px; text-align: center; }
.row-delete-btn { background: none; border: none; color: var(--text-muted); font-size: 13px; padding: 6px; }
.row-delete-btn:hover { color: var(--danger); }

.add-row-btn {
  margin-top: 10px; align-self: flex-start; padding: 8px 14px; background: none;
  border: 1px dashed var(--border); border-radius: 6px; color: var(--text-muted); font-size: 13px;
}
.add-row-btn:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Modal ---------- */
.modal-backdrop {
  position: fixed; inset: 0; background: rgba(20,22,30,0.4); display: flex;
  align-items: center; justify-content: center; z-index: 50; padding: 16px;
}
.modal-content {
  background: var(--panel); border-radius: var(--radius); padding: 22px; width: 360px; max-width: 100%;
  max-height: 85vh; overflow-y: auto; box-shadow: 0 10px 40px rgba(0,0,0,0.15);
}
.modal-content h3 { margin: 0 0 16px; font-size: 16px; }
.modal-content label { display: block; font-size: 12px; color: var(--text-muted); margin: 10px 0 4px; }
.modal-content input[type="text"], .modal-content input[type="password"], .modal-content select {
  width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 13px;
}
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 20px; }
.modal-btn { padding: 8px 14px; border-radius: 6px; font-size: 13px; border: 1px solid var(--border); background: var(--panel); }
.modal-btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.modal-btn.primary:hover { background: var(--accent-hover); }
.modal-btn.danger { color: var(--danger); border-color: var(--danger); }
.modal-error { color: var(--danger); font-size: 12px; margin-top: 8px; min-height: 14px; }
.user-row { display: flex; align-items: center; justify-content: space-between; padding: 6px 0; font-size: 13px; border-bottom: 1px solid var(--border); }
.user-row .admin-tag { font-size: 11px; color: var(--accent); margin-left: 6px; }
.user-row button { background: none; border: none; color: var(--text-muted); font-size: 12px; }
.user-row button:hover { color: var(--danger); }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .menu-toggle { display: block; }
  .sidebar {
    position: fixed; left: 0; top: 0; bottom: 0; z-index: 20; transform: translateX(-100%);
    transition: transform 0.2s ease; box-shadow: 4px 0 16px rgba(0,0,0,0.1);
  }
  .sidebar.open { transform: translateX(0); }
  .main { padding: 56px 12px 12px; }
}