:root {
  color-scheme: light dark;
  --bg: #f5f6f8; --panel: #ffffff; --text: #1a1d23; --muted: #6b7280;
  --border: #e2e5ea; --accent: #2563eb;
  --fail-bg: #fee2e2; --fail-border: #dc2626; --fail-text: #7f1d1d;
  --recheck-bg: #ffedd5; --recheck-border: #ea580c; --recheck-text: #7c2d12;
  --warning-bg: #fef9c3; --warning-border: #ca8a04; --warning-text: #713f12;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a; --panel: #1c1f26; --text: #e5e7eb; --muted: #9ca3af;
    --border: #2b2f38;
    --fail-bg: #4b1113; --fail-border: #f87171; --fail-text: #fecaca;
    --recheck-bg: #4a2408; --recheck-border: #fb923c; --recheck-text: #fed7aa;
    --warning-bg: #423608; --warning-border: #fbbf24; --warning-text: #fef08a;
  }
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, "Segoe UI", Roboto, "Noto Sans Thai", sans-serif; background: var(--bg); color: var(--text); }
header { padding: 20px 24px 8px; }
h1 { font-size: 20px; margin: 0 0 4px; }
.subtitle { color: var(--muted); font-size: 13px; margin: 0; }
main { padding: 16px 24px 48px; max-width: 100%; }

#dropzone {
  border: 2px dashed var(--border); border-radius: 12px; padding: 28px;
  text-align: center; cursor: pointer; background: var(--panel); margin-bottom: 12px;
  transition: border-color .15s, background .15s;
}
#dropzone.dragover { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, var(--panel)); }
#dropzone p { margin: 4px 0; color: var(--muted); }
#dropzone .dz-title { color: var(--text); font-weight: 600; font-size: 15px; }
#file-input { display: none; }
#file-info { font-size: 13px; color: var(--muted); margin-bottom: 12px; }

#summary { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.chip { padding: 6px 12px; border-radius: 999px; font-size: 13px; font-weight: 600; }
.chip-fail { background: var(--fail-bg); color: var(--fail-text); }
.chip-recheck { background: var(--recheck-bg); color: var(--recheck-text); }
.chip-warning { background: var(--warning-bg); color: var(--warning-text); }
.chip-ok { color: var(--muted); font-weight: 400; }
.chip-format { background: color-mix(in srgb, var(--accent) 15%, var(--panel)); color: var(--accent); }

.toolbar { display: flex; align-items: center; gap: 16px; margin-bottom: 8px; flex-wrap: wrap; }
.toolbar label { font-size: 13px; display: flex; align-items: center; gap: 6px; cursor: pointer; }
button { background: var(--accent); color: white; border: none; border-radius: 8px; padding: 8px 14px; font-size: 13px; cursor: pointer; font-weight: 600; }
button:hover { filter: brightness(1.08); }

section { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 12px; margin-bottom: 20px; }
section h2 { font-size: 14px; margin: 0 0 10px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }

#grid-wrap { overflow: auto; max-height: 520px; border: 1px solid var(--border); border-radius: 8px; }
table.grid { border-collapse: collapse; font-size: 12px; white-space: nowrap; width: max-content; min-width: 100%; }
table.grid th, table.grid td { border: 1px solid var(--border); padding: 4px 8px; text-align: left; }
table.grid thead th { position: sticky; top: 0; background: var(--panel); z-index: 2; font-weight: 600; }
table.grid .row-num, table.grid .row-type { position: sticky; left: 0; background: var(--panel); z-index: 1; font-weight: 600; color: var(--muted); }
table.grid .row-type { left: 34px; }
.col-letter { color: var(--muted); font-weight: 400; }
tr.row-header { background: color-mix(in srgb, var(--accent) 5%, transparent); }
.cell-na { background: repeating-linear-gradient(45deg, transparent, transparent 6px, color-mix(in srgb, var(--muted) 6%, transparent) 6px, color-mix(in srgb, var(--muted) 6%, transparent) 7px); }

.cell-fail { background: var(--fail-bg); box-shadow: inset 0 0 0 1.5px var(--fail-border); cursor: pointer; font-weight: 600; }
.cell-recheck { background: var(--recheck-bg); box-shadow: inset 0 0 0 1.5px var(--recheck-border); cursor: pointer; font-weight: 600; }
.cell-warning { background: var(--warning-bg); box-shadow: inset 0 0 0 1.5px var(--warning-border); cursor: pointer; font-weight: 600; }

.popover { position: absolute; z-index: 50; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 10px; max-width: 460px; box-shadow: 0 8px 24px rgba(0,0,0,.25); font-size: 12px; }
.popover-item { padding: 6px 8px; border-radius: 6px; margin-bottom: 6px; border-left: 3px solid var(--muted); }
.popover-item:last-child { margin-bottom: 0; }
.popover-fail { background: var(--fail-bg); border-left-color: var(--fail-border); color: var(--fail-text); }
.popover-recheck { background: var(--recheck-bg); border-left-color: var(--recheck-border); color: var(--recheck-text); }
.popover-warning { background: var(--warning-bg); border-left-color: var(--warning-border); color: var(--warning-text); }
.popover-title { font-weight: 700; margin-bottom: 3px; }
.popover-label { font-weight: 600; opacity: .8; }

#log-wrap { overflow: auto; max-height: 420px; border: 1px solid var(--border); border-radius: 8px; }
table.log { border-collapse: collapse; font-size: 12px; width: 100%; }
table.log th, table.log td { border: 1px solid var(--border); padding: 6px 8px; text-align: left; vertical-align: top; }
table.log thead th { position: sticky; top: 0; background: var(--panel); z-index: 1; }
tr.log-fail td:nth-child(4) { color: var(--fail-text); font-weight: 700; }
tr.log-recheck td:nth-child(4) { color: var(--recheck-text); font-weight: 700; }
tr.log-warning td:nth-child(4) { color: var(--warning-text); font-weight: 700; }

footer { padding: 12px 24px 32px; color: var(--muted); font-size: 12px; }