* { box-sizing: border-box; }

:root {
  --bg: #f4f6fb; --panel: #ffffff; --panel-2: #e9edf5; --border: #d3d9e6;
  --text: #1c2333; --dim: #5c6478; --accent: #3b7cff;
  --accent-glow: rgba(59, 124, 255, 0.08); --accent-2: #6a4df5;
  --danger: #d93a4c; --ok: #2f9e6a; --warn: #a06b12; --info: #6b7280;
  --shadow: 0 6px 24px rgba(23, 32, 60, 0.1);
}

body {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column;
  background: var(--bg); color: var(--text);
  font: 14px/1.5 "Segoe UI", system-ui, -apple-system, sans-serif;
}

header { padding: 12px 28px 4px; }
header h1 { margin: 0; font-size: 22px; letter-spacing: 0.5px; line-height: 1.15; }
.subtitle { margin: 3px 0 0; color: var(--dim); }

.topbar { display: flex; align-items: center; gap: 12px; padding: 12px 28px 0; flex-wrap: wrap; }

.tabs { display: flex; gap: 8px; padding: 0; }
.tab { background: var(--panel); color: var(--dim); border: 1px solid var(--border); border-radius: 8px; padding: 8px 18px; cursor: pointer; font: inherit; transition: border-color 0.15s, color 0.15s, filter 0.15s; }
.tab:hover:not(.active) { border-color: var(--accent); color: var(--accent); }
.tab.active { background: linear-gradient(135deg, var(--accent), var(--accent-2)); border-color: transparent; color: #fff; font-weight: 600; box-shadow: 0 4px 14px rgba(59, 124, 255, 0.28); }
.tab.active:hover { filter: brightness(1.12); }

.drop-zone {
  flex: 1 1 300px; min-width: 0; border: 2px dashed var(--border); border-radius: 10px;
  padding: 8px 14px; text-align: center; color: var(--dim);
  background: var(--panel); transition: border-color 0.15s, background 0.15s; cursor: pointer;
}
.drop-zone:hover { border-color: var(--accent); background: var(--accent-glow); }
.drop-zone.dragover { border-color: var(--accent); background: rgba(59, 124, 255, 0.1); box-shadow: inset 0 0 0 1px var(--accent), 0 0 16px rgba(59, 124, 255, 0.18); }
.drop-zone .prompt { font-size: 14px; font-weight: 600; color: var(--dim); }
.drop-zone .file-labels { display: flex; gap: 10px; justify-content: center; margin-top: 3px; flex-wrap: wrap; font-size: 12px; }
.file-assign { color: var(--dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 45%; }
.file-assign.has-file { color: var(--text); }
.file-assign.has-file.ok { color: var(--ok); }
.file-assign.has-file.err { color: var(--danger); }

.actions { display: flex; justify-content: center; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
button { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 7px 14px; cursor: pointer; font: inherit; line-height: 1.3; transition: border-color 0.15s, background 0.15s, filter 0.15s, opacity 0.15s; }
button.primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff; border: none; font-weight: 600; box-shadow: 0 4px 14px rgba(59, 124, 255, 0.28); white-space: nowrap; }
button.primary:hover:not(:disabled) { filter: brightness(1.12); border-color: transparent; }
button.primary:disabled { background: var(--panel-2); color: var(--dim); box-shadow: none; }

main { flex: 1; overflow: auto; display: none; }
body.has-result main { display: block; }
.tab-pane { display: none; }
.tab-pane.active { display: block; }
.xls-layout { padding: 16px 28px 20px; display: flex; flex-direction: row; align-items: stretch; flex-wrap: wrap; gap: 16px; }
.pane-empty { padding: 28px; text-align: center; font-size: 14px; margin: 0; }

.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 0; box-shadow: var(--shadow); overflow: hidden; }
.pane-header {
  display: flex; align-items: center; gap: 8px; padding: 8px 12px;
  background: var(--panel-2); border-bottom: 1px solid var(--border); color: var(--dim);
  font-size: 12px; letter-spacing: 0.04em; text-transform: uppercase;
}
.tbl-wrap { max-height: 55vh; overflow: auto; }
table.tbl { border-collapse: separate; border-spacing: 0; width: 100%; font-size: 12.5px; }
table.tbl th, table.tbl td { border: none; border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 3px 8px; text-align: left; white-space: nowrap; }
table.tbl th:first-child, table.tbl td:first-child { border-left: 1px solid var(--border); }
table.tbl thead th { border-top: 1px solid var(--border); background: var(--panel-2); color: var(--dim); font-size: 12px; letter-spacing: 0.04em; text-transform: uppercase; position: sticky; top: 0; text-align: center; z-index: 1; }
table.tbl td.num { text-align: center; }
table.tbl tr.miss td.article { color: var(--danger); }

.log { flex: 0 0 auto; max-height: 160px; overflow: auto; margin: 0 28px 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--panel); padding: 8px 10px; font-size: 12.5px; font-family: Consolas, "Courier New", monospace; display: flex; flex-direction: column; gap: 2px; }
.log:empty { display: none; }
.log-line { padding: 3px 8px; border-left: 3px solid var(--border); border-radius: 3px; }
.log-info { border-left-color: var(--info); color: var(--dim); }
.log-ok { border-left-color: var(--ok); color: var(--ok); }
.log-warn { border-left-color: var(--warn); color: #8a5c0e; background: rgba(160, 107, 18, 0.09); font-weight: 600; }
.log-error { border-left-color: var(--danger); color: #b02638; }

.overlay { position: fixed; inset: 0; z-index: 100; display: none; align-items: center; justify-content: center; background: rgba(30, 38, 60, 0.35); backdrop-filter: blur(2px); }
body.show-overlay .overlay { display: flex; }
.overlay .overlay-box { border: 2px dashed var(--accent); background: rgba(255, 255, 255, 0.98); color: var(--text); padding: 24px 32px; border-radius: 16px; font-size: 14px; box-shadow: 0 12px 48px rgba(23, 32, 60, 0.25); max-width: 640px; max-height: 70vh; overflow: auto; }
.overlay h3 { margin: 0 0 10px; font-size: 17px; }
.overlay .ov-section { margin: 10px 0; }
.overlay .ov-item { padding: 4px 8px; border-left: 3px solid var(--border); margin: 4px 0; border-radius: 3px; font-size: 13px; }
.overlay .ov-item.warn { border-left-color: var(--warn); color: #8a5c0e; background: rgba(160, 107, 18, 0.09); font-weight: 600; }
.overlay .ov-item.error { border-left-color: var(--danger); color: #b02638; }
.overlay .ov-item.ok { border-left-color: var(--ok); color: var(--ok); }
.overlay .ov-item.info { border-left-color: var(--border); color: #445; }
.overlay .actions { margin-top: 14px; }

footer { margin-top: auto; padding: 4px 28px 16px; text-align: center; }
.dim { color: var(--dim); }