:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #1f2933;
  --muted: #5d6773;
  --border: #d8dde3;
  --accent: #1769aa;
  --accent-dark: #0f4f82;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 18px;
  line-height: 1.5;
}

a {
  color: inherit;
}

.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px 24px;
}

.brand {
  color: var(--accent-dark);
  font-size: 24px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.main-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.main-nav a {
  border-radius: 4px;
  color: var(--text);
  padding: 8px 12px;
  text-decoration: none;
}

.main-nav a:hover,
.main-nav a:focus,
.main-nav a[aria-current="page"] {
  background: var(--accent);
  color: #ffffff;
}

.page {
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 24px;
}

.back-link {
  color: var(--accent-dark);
  display: inline-block;
  font-weight: 700;
  margin-bottom: 24px;
  text-decoration: none;
}

.back-link:hover,
.back-link:focus {
  text-decoration: underline;
}

.page-header {
  margin-bottom: 32px;
}

.eyebrow {
  color: var(--accent-dark);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0;
  margin: 0 0 8px;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  font-size: 42px;
  line-height: 1.1;
  margin-bottom: 12px;
}

h2 {
  font-size: 26px;
  margin-bottom: 16px;
}

.lead {
  color: var(--muted);
  font-size: 22px;
  max-width: 720px;
}

.message {
  border: 1px solid var(--border);
  border-radius: 6px;
  font-weight: 700;
  margin-bottom: 24px;
  padding: 14px 16px;
}

.message-error {
  background: #fff4f4;
  border-color: #d64545;
  color: #8a1f1f;
}

.message-success {
  background: #eef8f0;
  border-color: #3f8f4f;
  color: #245b30;
}

.upload-form {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 32px;
  max-width: 640px;
  padding: 20px;
}

.upload-form label {
  display: block;
  font-weight: 700;
  margin-bottom: 8px;
}

.upload-form input[type="file"] {
  display: block;
  margin-bottom: 18px;
  width: 100%;
}

.upload-form button {
  background: var(--accent);
  border: 0;
  border-radius: 4px;
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 10px 16px;
}

.upload-form button:hover,
.upload-form button:focus {
  background: var(--accent-dark);
}

.data-form {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  max-width: 720px;
  padding: 22px;
}

.data-form label {
  display: block;
  font-weight: 700;
  margin-bottom: 6px;
}

.data-form input {
  border: 1px solid var(--border);
  border-radius: 4px;
  display: block;
  font: inherit;
  margin-bottom: 16px;
  padding: 10px 12px;
  width: 100%;
}

.data-form input:focus {
  border-color: var(--accent);
  outline: 3px solid rgba(23, 105, 170, 0.18);
}

.data-form input[type="checkbox"] {
  display: inline-block;
  margin: 0;
  width: auto;
}

.checkbox-field {
  align-items: center;
  display: flex;
  gap: 10px;
  margin-bottom: 18px;
}

.data-form button {
  background: var(--accent);
  border: 0;
  border-radius: 4px;
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  padding: 10px 16px;
}

.data-form button:hover,
.data-form button:focus {
  background: var(--accent-dark);
}

.required-label {
  color: var(--muted);
  font-size: 14px;
  font-weight: 400;
}

.expected-columns {
  max-width: 720px;
}

.expected-columns ul {
  columns: 2;
  padding-left: 24px;
}

.expected-columns li {
  margin-bottom: 6px;
}

.scan-form {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  max-width: 760px;
  padding: 24px;
}

.scan-form label {
  display: block;
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 10px;
}

.scan-input {
  border: 2px solid var(--border);
  border-radius: 6px;
  display: block;
  font: inherit;
  font-size: 34px;
  margin-bottom: 20px;
  padding: 16px;
  width: 100%;
}

.scan-input:focus {
  border-color: var(--accent);
  outline: 4px solid rgba(23, 105, 170, 0.18);
}

.scan-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.scan-button {
  border: 0;
  border-radius: 4px;
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-size: 22px;
  font-weight: 700;
  min-width: 180px;
  padding: 14px 22px;
}

.scan-button-in {
  background: #2f7d32;
}

.scan-button-out {
  background: var(--accent);
}

.scan-button:hover,
.scan-button:focus {
  filter: brightness(0.9);
}

.table-wrap {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow-x: auto;
}

.participants-table {
  border-collapse: collapse;
  min-width: 980px;
  width: 100%;
}

.participants-table th,
.participants-table td {
  border-bottom: 1px solid var(--border);
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
}

.participants-table th {
  background: #eef2f6;
  font-size: 15px;
}

.participants-table td {
  font-size: 16px;
}

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

.empty-state {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--muted);
  font-weight: 700;
  max-width: 640px;
  padding: 20px;
}

.dashboard-stats {
  margin-bottom: 32px;
}

.section-heading {
  align-items: baseline;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  justify-content: space-between;
}

.status-note {
  color: var(--muted);
  margin-bottom: 16px;
}

.stat-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.stat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  min-height: 112px;
  padding: 18px;
}

.stat-card span {
  color: var(--muted);
  display: block;
  font-size: 16px;
  margin-bottom: 8px;
}

.stat-card strong {
  display: block;
  font-size: 36px;
  line-height: 1;
}

.link-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.quick-link {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  display: block;
  min-height: 132px;
  padding: 20px;
  text-decoration: none;
}

.quick-link:hover,
.quick-link:focus {
  border-color: var(--accent);
  outline: 3px solid rgba(23, 105, 170, 0.18);
}

.quick-link strong {
  display: block;
  font-size: 22px;
  margin-bottom: 8px;
}

.quick-link span {
  color: var(--muted);
  display: block;
}

@media (max-width: 720px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .main-nav a {
    padding: 10px 12px;
  }

  h1 {
    font-size: 34px;
  }

  .lead {
    font-size: 20px;
  }

  .expected-columns ul {
    columns: 1;
  }

  .scan-input {
    font-size: 26px;
  }

  .scan-button {
    width: 100%;
  }
}