:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #243047;
  --muted: #5f6b7f;
  --line: #d9e1ee;
  --primary: #3b6cf0;
  --primary-soft: #edf3ff;
  --warn: #fff6ea;
  --warn-line: #ffd9a8;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    "Segoe UI",
    "Hiragino Kaku Gothic ProN",
    "Yu Gothic",
    sans-serif;
}

.page {
  width: min(1200px, 94vw);
  margin: 24px auto 48px;
}

.card {
  background: var(--card);
  border-radius: 16px;
  border: 1px solid var(--line);
  box-shadow: 0 8px 24px rgba(29, 52, 90, 0.06);
  padding: 24px;
}

.card-header h1 {
  margin: 0;
  font-size: 30px;
  line-height: 1.2;
}

.card-header p {
  margin: 10px 0 0;
  color: var(--muted);
}

.section-title {
  margin: 0 0 10px;
  font-size: 20px;
}

.upload-section,
.month-section,
.action-area,
.result-section {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.upload-section--optional {
  margin-top: 18px;
}

.badge-optional {
  margin-left: 10px;
  font-size: 12px;
  color: #906100;
  background: #fff5dd;
  border: 1px solid #ffdea0;
  padding: 3px 8px;
  border-radius: 999px;
  vertical-align: middle;
}

.badge-required {
  margin-left: 10px;
  font-size: 12px;
  color: #174fa5;
  background: #e8f0ff;
  border: 1px solid #c7d9ff;
  padding: 3px 8px;
  border-radius: 999px;
  vertical-align: middle;
}

.upload-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.upload-block {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fcfdff;
  padding: 12px;
}

.upload-block h3 {
  margin: 0 0 10px;
  font-size: 16px;
}

.upload-block--loaded {
  border-color: #9ccca6;
  background: #f2fff4;
}

.upload-block--master {
  max-width: 560px;
}

.drop-area {
  display: block;
  border: 2px dashed #b8c8e8;
  border-radius: 12px;
  padding: 28px 20px;
  text-align: center;
  background: #f9fbff;
  cursor: pointer;
  transition: 0.15s ease;
}

.drop-area--small {
  padding: 18px 16px;
}

.drop-area:hover,
.drop-area--dragover {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.drop-title {
  display: block;
  font-weight: 700;
}

.drop-sub {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}

.file-input {
  display: none;
}

.file-name {
  margin: 10px 0 0;
  font-size: 13px;
  color: #324968;
  word-break: break-all;
}

.note,
.hint,
.storage-note {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.master-tools {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 12px;
  flex-wrap: wrap;
}

.ghost-button {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: 8px;
  padding: 7px 10px;
  cursor: pointer;
}

.ghost-button:hover {
  border-color: #afbfde;
  background: #f7faff;
}

.month-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.month-row input[type="month"] {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font: inherit;
}

.split-button {
  min-width: 300px;
  border: 0;
  border-radius: 10px;
  padding: 12px 18px;
  background: var(--primary);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
}

.split-button[disabled] {
  cursor: not-allowed;
  opacity: 0.5;
}

.filter-summary {
  margin-top: 8px;
  font-size: 14px;
  color: #334b72;
}

.warnings {
  margin-top: 12px;
  border: 1px solid var(--warn-line);
  background: var(--warn);
  border-radius: 10px;
  padding: 12px 14px;
}

.warnings h3 {
  margin: 0;
  font-size: 16px;
}

.warnings ul {
  margin: 10px 0 0 20px;
}

.warnings li {
  margin: 4px 0;
}

.tab-bar {
  display: flex;
  gap: 8px;
  margin-top: 16px;
}

.tab {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  padding: 8px 12px;
  cursor: pointer;
}

.tab--active {
  border-color: var(--primary);
  background: var(--primary-soft);
  color: #1e4fd6;
}

.table-wrap {
  margin-top: 12px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.result-table {
  border-collapse: collapse;
  width: max-content;
  min-width: 100%;
  font-size: 13px;
}

.result-table th,
.result-table td {
  border-bottom: 1px solid #e7edf7;
  border-right: 1px solid #e7edf7;
  padding: 7px 8px;
  white-space: nowrap;
}

.result-table th {
  background: #f2f6ff;
  position: sticky;
  top: 0;
  z-index: 1;
}

.result-table tr:last-child td {
  border-bottom: 0;
}

.row-warning td {
  background: #fff1f1;
}

.truncate-note {
  margin: 10px;
  font-size: 12px;
  color: var(--muted);
}

.tab-panel {
  margin-top: 12px;
}

.preview-heading {
  margin: 14px 0 6px;
  font-size: 15px;
  color: #334b72;
}

.preview-sub {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 13px;
}

.download-area {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.dl-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 10px 12px;
  cursor: pointer;
}

.dl-button:hover {
  border-color: #8ca7e1;
  background: #f7faff;
}

@media (max-width: 760px) {
  .upload-grid {
    grid-template-columns: 1fr;
  }

  .page {
    width: 96vw;
    margin-top: 12px;
  }

  .card {
    padding: 14px;
  }

  .card-header h1 {
    font-size: 24px;
  }

  .split-button {
    width: 100%;
    min-width: 0;
  }
}