:root {
  --bg: #f3f5f9;
  --panel: #ffffff;
  --panel-2: #f8fafc;
  --text: #1b2433;
  --muted: #64748b;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-soft: #e8f0fe;
  --accent-text: #ffffff;
  --row-set: #ecfdf3;
  --row-err: #fde8ea;
  --row-sel: #e8f0fe;
  --row-alt: #fafbfd;
  --warn: #9a6200;
  --ok: #15803d;
  --bad: #c0262d;
  --shadow: 0 1px 2px rgb(15 23 42 / 0.05), 0 2px 8px rgb(15 23 42 / 0.04);
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f131a;
    --panel: #171c25;
    --panel-2: #1c2230;
    --text: #e5e9f0;
    --muted: #94a0b4;
    --border: #2a3242;
    --border-strong: #3a4458;
    --accent: #5b8def;
    --accent-hover: #7aa3f3;
    --accent-soft: #1e2b45;
    --accent-text: #0b0f16;
    --row-set: #16301f;
    --row-err: #43212a;
    --row-sel: #1e2b45;
    --row-alt: #1a202b;
    --warn: #e5b45a;
    --ok: #5cc27a;
    --bad: #ff7a85;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html { color-scheme: light dark; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  padding-bottom: 72px; /* chừa chỗ cho thanh nút cố định */
}
h1 { font-size: 17px; margin: 0; letter-spacing: -0.01em; }
h2 { font-size: 14px; margin: 0 0 12px; }

/* ---------- thanh tiêu đề */
.topbar { background: var(--panel); border-bottom: 1px solid var(--border); padding: 12px 24px; }
.brand { display: flex; align-items: center; gap: 12px; max-width: 1400px; margin: 0 auto; }
.logo {
  width: 34px; height: 34px; border-radius: 8px; display: grid; place-items: center;
  background: var(--accent); color: var(--accent-text); font-weight: 700; font-size: 17px;
}
.subtitle { margin: 0; color: var(--muted); font-size: 12.5px; }

.page { max-width: 1400px; margin: 0 auto; padding: 16px 24px 0; }

/* ---------- thẻ */
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-bottom: 14px;
}
.card.flush { padding: 0; overflow: hidden; }
.card-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 12px 16px; border-bottom: 1px solid var(--border); }
.card-head h2 { margin: 0; }

/* ---------- ô nhập */
input, select {
  font: inherit;
  color: inherit;
  background: var(--panel);
  border: 1px solid var(--border-strong);
  border-radius: 7px;
  padding: 6px 10px;
  min-height: 34px;
  max-width: 100%;
  transition: border-color 0.15s, box-shadow 0.15s;
}
input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
input:disabled, select:disabled { background: var(--panel-2); color: var(--muted); }
input[type="number"] { width: 110px; }
input[type="checkbox"] { min-height: 0; width: 16px; height: 16px; accent-color: var(--accent); margin: 0; }
input::placeholder { color: var(--muted); opacity: 0.8; }

.field { display: flex; flex-direction: column; gap: 5px; }
.field-label { font-size: 12px; font-weight: 600; color: var(--muted); }
.inline { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.check { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; }
.checks { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 12px; }
.card > .checks:first-of-type:not(:only-child) { margin-top: 12px; }
#file-errors { margin-top: 0; }

.toolbar { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 14px 22px; }
.toolbar select { min-width: 130px; }
.toolbar #seed { width: 120px; }
.field-wide { flex: 1 1 280px; }

/* công tắc vòng đời */
.switch { display: inline-flex; align-items: center; gap: 10px; cursor: pointer; min-height: 34px; }
.switch input { position: absolute; opacity: 0; width: 0; height: 0; }
.switch .track { width: 36px; height: 20px; border-radius: 999px; background: var(--border-strong); position: relative; transition: background 0.15s; flex: none; }
.switch .track::after { content: ""; position: absolute; top: 2px; left: 2px; width: 16px; height: 16px; border-radius: 50%; background: #fff; transition: transform 0.15s; }
.switch input:checked + .track { background: var(--accent); }
.switch input:checked + .track::after { transform: translateX(16px); }
.switch input:focus-visible + .track { box-shadow: 0 0 0 3px var(--accent-soft); }
.switch input:disabled + .track { opacity: 0.5; }

.chip { display: inline-block; padding: 3px 10px; border-radius: 999px; background: var(--panel-2); border: 1px solid var(--border); color: var(--muted); font-size: 12.5px; }

/* ---------- nút */
.btn, button {
  font: inherit;
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 34px; padding: 6px 14px;
  border-radius: 7px; border: 1px solid var(--border-strong);
  background: var(--panel); color: var(--text);
  cursor: pointer; white-space: nowrap; font-weight: 500;
  transition: background 0.15s, border-color 0.15s;
}
.btn:hover, button:hover { border-color: var(--accent); }
.btn:focus-visible, button:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--accent-soft); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--accent); }
.btn.ghost:hover { background: var(--accent-soft); }
.btn.icon { min-width: 34px; padding: 6px; }
td button { min-height: 28px; padding: 3px 10px; font-size: 12.5px; }

/* ---------- tab */
.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin: 4px 0 14px; overflow-x: auto; }
.tabs button {
  border: none; border-radius: 0; background: transparent; color: var(--muted);
  padding: 10px 14px; border-bottom: 2px solid transparent; margin-bottom: -1px; font-weight: 600;
}
.tabs button:hover { color: var(--text); border-color: transparent; border-bottom-color: var(--border-strong); }
.tabs button.active { color: var(--accent); border-bottom-color: var(--accent); }
.num {
  display: inline-grid; place-items: center; width: 20px; height: 20px; border-radius: 50%;
  background: var(--panel-2); border: 1px solid var(--border); font-size: 11px; color: var(--muted);
}
.tabs button.active .num { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }

.tab { display: none; }
.tab.active { display: block; }
.tab.two-col.active { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 14px; align-items: start; }
.tab.two-col .card { margin-bottom: 0; }

.form-grid { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 8px 14px; align-items: center; }
.form-grid label { color: var(--muted); font-size: 13px; }
.form-grid input { width: 100%; }

.err-form { display: flex; flex-wrap: wrap; gap: 12px 14px; align-items: flex-end; }
.err-form .grow { flex: 1 1 280px; }
.err-form .grow select { width: 100%; }
.hint { margin: 12px 0 0; color: var(--muted); font-size: 13px; min-height: 1.4em; }

.below { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin: -2px 0 14px; }
.info { margin: 0; color: var(--muted); white-space: pre-wrap; font-size: 13px; }
.info:not(:empty) { padding: 10px 12px; background: var(--panel); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 8px; color: var(--text); flex: 1; }

/* ---------- bảng */
.table-wrap { overflow: auto; max-height: 56vh; }
.table-wrap.short { max-height: 34vh; }
table { border-collapse: collapse; width: 100%; font-size: 13px; }
th, td { text-align: left; padding: 7px 12px; border-bottom: 1px solid var(--border); vertical-align: middle; }
th {
  position: sticky; top: 0; z-index: 1;
  background: var(--panel-2); color: var(--muted);
  font-size: 11.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em;
}
tbody tr:nth-child(even) td { background: var(--row-alt); }
tbody tr:hover td { background: var(--accent-soft); }
tbody tr:last-child td { border-bottom: none; }
tr.set td { background: var(--row-set) !important; }
tr.sel td { background: var(--row-sel) !important; }
tr.warn td { color: var(--warn); }
#cols-table td:nth-child(1) { color: var(--muted); width: 44px; }
#cols-table td:nth-child(2) { font-weight: 600; font-family: ui-monospace, Consolas, monospace; font-size: 12.5px; }
#cols-table td:nth-child(3) { color: var(--muted); }
#cols-table td:nth-child(4) { color: var(--muted); }
#cols-table .c-val { width: 32%; }
#cols-table input { width: 100%; min-height: 30px; padding: 4px 8px; }
#cols-table tbody tr, #report-table tbody tr { cursor: pointer; }
td:empty::after { content: ""; }

/* ---------- xem trước */
.preview {
  margin: 0;
  padding: 12px 0;
  overflow: auto;
  max-height: 50vh;
  font: 12.5px/1.6 ui-monospace, Consolas, "Cascadia Mono", monospace;
  background: var(--panel);
}
.preview > div { padding: 0 16px; }
.preview .ln { color: var(--muted); user-select: none; opacity: 0.7; }
.preview .err { background: var(--row-err); border-radius: 3px; }
.preview .ht { color: var(--accent); font-weight: 600; }
.preview .sep { color: var(--muted); opacity: 0.55; }
.preview .empty { display: block; padding: 24px 16px; color: var(--muted); font-family: system-ui, sans-serif; }

/* ---------- thanh nút dưới cùng */
.actions {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 24px;
  background: var(--panel); border-top: 1px solid var(--border);
  box-shadow: 0 -2px 10px rgb(15 23 42 / 0.05);
}
.buttons { display: flex; gap: 8px; align-items: center; }
.status { color: var(--muted); font-size: 12.5px; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------- hộp thoại kiểm tra file */
dialog {
  width: min(1100px, calc(100vw - 32px));
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--panel); color: var(--text);
  padding: 18px; box-shadow: 0 20px 50px rgb(0 0 0 / 0.25);
}
dialog::backdrop { background: rgb(15 23 42 / 0.45); }
dialog .table-wrap { border: 1px solid var(--border); border-radius: 8px; }
.dialog-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.ok { color: var(--ok); font-weight: 600; }
.bad { color: var(--bad); font-weight: 600; }

/* ---------- màn hình tải */
.loading { position: fixed; inset: 0; z-index: 10; display: flex; flex-direction: column; gap: 14px; align-items: center; justify-content: center; background: var(--bg); color: var(--muted); }
.loading.hidden { display: none; }
.spinner { width: 34px; height: 34px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- màn hình nhỏ */
@media (max-width: 900px) {
  .tab.two-col.active { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 640px) {
  .topbar, .page { padding-left: 16px; padding-right: 16px; }
  .form-grid { grid-template-columns: minmax(0, 1fr); }
  .actions { flex-direction: column; align-items: stretch; padding: 10px 16px; }
  .buttons { justify-content: flex-end; flex-wrap: wrap; }
  body { padding-bottom: 120px; }
  .below { flex-direction: column; }
}