:root {
  color-scheme: light;
  --page-bg: #f4f6f8;
  --panel-bg: #ffffff;
  --text: #17202a;
  --muted: #607080;
  --border: #d9e0e7;
  --accent: #167a72;
  --accent-strong: #0c5f59;
  --accent-soft: #e6f4f2;
  --warning-soft: #fff5dd;
  --danger: #b42318;
  --danger-soft: #fff1f0;
  --success: #1f7a4d;
  --success-soft: #eaf7ef;
  --shadow: 0 18px 45px rgba(23, 32, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--page-bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

.shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.app-header {
  padding: 48px 0 32px;
  background: #eef4f3;
  border-bottom: 1px solid var(--border);
}

.header-layout {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 10px;
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.05;
}

h2 {
  margin-bottom: 8px;
  font-size: 1.18rem;
  line-height: 1.25;
}

.subtitle {
  max-width: 620px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.top-nav {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-actions {
  flex: 0 0 auto;
  display: grid;
  justify-items: end;
  gap: 8px;
}

.app-version {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.top-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 6px 12px;
  border: 1px solid #b9ddd8;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}

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

.main-layout {
  display: grid;
  gap: 20px;
  padding: 28px 0 56px;
}

.panel {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-bg);
  box-shadow: var(--shadow);
}

.auth-panel {
  max-width: 620px;
  padding: 32px;
}

.auth-panel h1 {
  margin-bottom: 20px;
  font-size: clamp(2rem, 5vw, 2.7rem);
}

.auth-form {
  display: grid;
  gap: 10px;
}

.auth-form label {
  color: var(--text);
  font-weight: 700;
}

.auth-form input[type="password"] {
  width: 100%;
  min-height: 42px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
}

.auth-form button {
  width: fit-content;
  margin-top: 8px;
  padding: 0 18px;
  font-size: 1rem;
}

.upload-panel,
.uploads-panel,
.analysis-panel,
.mail-merge-panel,
.help-panel,
.status-panel {
  padding: 24px;
}

.section-heading {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 22px;
}

.section-heading p,
.workflow-card p,
.mail-merge-panel p,
.help-panel p,
.status-panel p,
.uploads-panel p {
  margin-bottom: 0;
  color: var(--muted);
}

.step-marker {
  flex: 0 0 auto;
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: #ffffff;
  font-weight: 800;
}

.upload-box {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: end;
  padding: 18px;
  border: 1px dashed #aec3cc;
  border-radius: 8px;
  background: #fbfcfd;
}

.upload-box label {
  grid-column: 1 / -1;
  color: var(--text);
  font-weight: 700;
}

.form-note {
  margin: 12px 0 0;
  color: var(--danger);
  font-weight: 700;
}

input[type="file"] {
  width: 100%;
  min-height: 42px;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #ffffff;
  color: var(--muted);
}

button {
  min-height: 42px;
  padding: 0 16px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #ffffff;
  font: inherit;
  font-weight: 800;
}

.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 6px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 800;
  text-decoration: none;
}

.button-link:hover {
  background: var(--accent-strong);
}

.danger-button {
  background: var(--danger);
}

button:disabled,
input:disabled {
  cursor: not-allowed;
  opacity: 0.7;
}

.notice {
  padding: 14px 16px;
  border-radius: 8px;
  font-weight: 700;
}

.notice.success {
  border: 1px solid #b9e2c8;
  background: var(--success-soft);
  color: var(--success);
}

.notice.error {
  border: 1px solid #f1b9b4;
  background: var(--danger-soft);
  color: var(--danger);
}

.uploads-panel {
  display: grid;
  gap: 18px;
}

.upload-list {
  display: grid;
  gap: 12px;
}

.upload-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fbfcfd;
}

.upload-item.active {
  border-color: #8dcac1;
  background: var(--accent-soft);
}

.upload-item h3 {
  margin: 0 0 4px;
  font-size: 1rem;
}

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

.active-badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 3px 8px;
  border-radius: 999px;
  background: #ffffff;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 800;
}

.upload-actions {
  flex: 0 0 auto;
  display: flex;
  gap: 10px;
}

.upload-actions form {
  margin: 0;
}

.empty-state {
  padding: 18px;
  border: 1px dashed #aec3cc;
  border-radius: 8px;
  background: #fbfcfd;
}

.workflow-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.analysis-panel {
  display: grid;
  gap: 18px;
}

.analysis-actions {
  margin: 0;
}

.analysis-status {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid #b9ddd8;
  border-radius: 8px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 800;
}

.analysis-status time {
  color: var(--muted);
  font-weight: 700;
}

.analysis-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
}

.analysis-summary > div {
  min-width: 0;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fbfcfd;
}

.analysis-summary strong,
.analysis-summary span {
  display: block;
}

.analysis-summary strong {
  font-size: 1.35rem;
  line-height: 1.1;
}

.analysis-summary span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.9rem;
}

.analysis-summary .summary-error {
  border-color: #f1b9b4;
  background: var(--danger-soft);
}

.analysis-summary .summary-error strong {
  color: var(--danger);
}

.analysis-summary .summary-warning {
  border-color: #ecd7a8;
  background: var(--warning-soft);
}

.mail-merge-actions {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 12px;
}

.mail-merge-export-form {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.mail-merge-export-form label {
  color: var(--muted);
  font-size: 0.9rem;
}

.mail-merge-export-form select {
  min-width: 120px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
}

.mail-merge-export-form button[type="submit"] {
  border: 0;
  cursor: pointer;
}

.collapsible-section {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fbfcfd;
}

.collapsible-section + .collapsible-section,
.analysis-summary + .collapsible-section,
.mail-merge-actions + .collapsible-section {
  margin-top: 12px;
}

.collapsible-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.collapsible-summary::-webkit-details-marker {
  display: none;
}

.collapsible-summary::marker {
  content: "";
}

.collapsible-summary::after {
  flex: 0 0 auto;
  color: var(--accent-strong);
  font-size: 0.95rem;
  font-weight: 800;
  content: "▸";
}

.collapsible-section[open] > .collapsible-summary::after {
  content: "▾";
}

.collapsible-title {
  font-size: 1rem;
  font-weight: 800;
}

.collapsible-meta {
  margin-right: auto;
  margin-left: 12px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

.collapsible-body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--border);
}

.collapsible-body .issue-list,
.collapsible-body .empty-state {
  margin-top: 14px;
}

.collapsible-body .mail-merge-table-wrap {
  margin-top: 14px;
}

.collapsible-body .shift-assignment-list {
  margin-top: 14px;
}

.shift-assignment-collapsible .shift-assignment-list {
  display: grid;
  gap: 16px;
}

.shift-assignment-collapsible .shift-assignment-card {
  border: 2px solid #6aab9f;
  border-radius: 10px;
  background: linear-gradient(180deg, #f7fbfb 0%, #f0f7f5 100%);
  padding: 0;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(12, 95, 89, 0.04);
}

.shift-assignment-collapsible .shift-assignment-card h3 {
  margin: 0;
  padding: 12px 16px;
  background: #edf5f3;
  color: var(--accent-strong);
  font-size: 1rem;
  font-weight: 800;
}

.shift-assignment-collapsible .shift-assignment-table-wrap {
  margin: 12px;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #ffffff;
}

.shift-assignment-collapsible .shift-assignment-table {
  width: 100%;
  table-layout: auto;
  border-collapse: collapse;
  font-size: 0.92rem;
  background: #ffffff;
}

.shift-assignment-collapsible .shift-assignment-table th,
.shift-assignment-collapsible .shift-assignment-table td {
  padding: 9px 12px;
  border: 1px solid #c8d8de;
  text-align: left;
  vertical-align: top;
}

.shift-assignment-collapsible .shift-assignment-table thead th {
  background: #eef4f3;
  border-color: #d5e3df;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.shift-assignment-collapsible .shift-assignment-table tbody tr:nth-child(even) td {
  background: #fafcfc;
}

.shift-assignment-collapsible .shift-assignment-col-time {
  width: 1%;
}

.shift-assignment-collapsible .shift-assignment-table th:first-child,
.shift-assignment-collapsible .shift-assignment-table td:first-child {
  white-space: nowrap;
}

.shift-assignment-collapsible .shift-assignment-table td:first-child {
  font-weight: 600;
  color: var(--accent-strong);
}

.shift-assignment-collapsible .shift-assignment-table th:last-child,
.shift-assignment-collapsible .shift-assignment-table td:last-child {
  width: 100%;
  word-break: break-word;
}

.mail-merge-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.mail-merge-table {
  width: 100%;
  min-width: 680px;
  border-collapse: collapse;
  background: #ffffff;
}

.mail-merge-table th,
.mail-merge-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.mail-merge-table th {
  background: #eef4f3;
  color: var(--accent-strong);
  font-size: 0.78rem;
  text-transform: uppercase;
}

.mail-merge-table th:nth-child(2),
.mail-merge-table td:nth-child(2) {
  width: 86px;
  text-align: right;
}

.mail-merge-table tbody tr:last-child td {
  border-bottom: 0;
}

.mail-merge-table .shift-text {
  white-space: pre-line;
}

.help-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.help-grid article {
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fbfcfd;
}

.help-grid h3 {
  margin: 0 0 6px;
  font-size: 0.98rem;
}

.rule-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.rule-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  background: #ffffff;
}

.rule-table th,
.rule-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.rule-table th {
  background: #eef4f3;
  color: var(--accent-strong);
  font-size: 0.78rem;
  text-transform: uppercase;
}

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

.prefix-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.prefix-list code {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  padding: 4px 9px;
  border: 1px solid #b9ddd8;
  border-radius: 6px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 800;
}

.issue-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 14px;
}

.issue-heading h3 {
  margin: 0;
  font-size: 1rem;
}

.issue-heading p {
  margin: 0;
  color: var(--muted);
  font-weight: 700;
}

.issue-list {
  display: grid;
  gap: 10px;
}

.issue-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fbfcfd;
}

.issue-item.error {
  border-color: #f1b9b4;
  background: var(--danger-soft);
}

.issue-item.warning {
  border-color: #ecd7a8;
  background: var(--warning-soft);
}

.issue-item.has-shift-pair {
  grid-template-columns: minmax(0, 1fr);
}

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

.issue-severity {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 8px;
  border-radius: 999px;
  background: #ffffff;
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 800;
}

.issue-item.error .issue-severity {
  color: var(--danger);
}

.issue-item.warning .issue-severity {
  color: #866118;
}

.issue-item p {
  margin: 4px 0 0;
  color: var(--muted);
}

.issue-conflict-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 800;
}

.issue-shift-pair {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  margin-top: 12px;
  overflow: hidden;
  border: 1px solid rgba(96, 112, 128, 0.34);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.7);
}

.issue-shift-pair section {
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
}

.issue-shift-pair section + section {
  border-left: 1px solid rgba(96, 112, 128, 0.34);
}

.issue-shift-area {
  padding: 7px 10px;
  border-bottom: 1px solid rgba(96, 112, 128, 0.26);
  background: rgba(255, 255, 255, 0.58);
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 800;
  text-transform: uppercase;
}

.issue-shift-box {
  display: grid;
  gap: 3px;
  min-height: 84px;
  padding: 10px;
}

.issue-shift-box strong,
.issue-shift-box span,
.issue-shift-box small {
  overflow-wrap: anywhere;
}

.issue-shift-box strong {
  color: var(--text);
  line-height: 1.25;
}

.issue-shift-box span {
  color: var(--text);
  font-weight: 700;
}

.issue-shift-box small {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
}

.issue-meta {
  display: grid;
  gap: 6px;
  min-width: 150px;
  margin: 0;
  color: var(--muted);
}

.issue-meta div {
  display: grid;
  gap: 1px;
}

.issue-meta dt {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
}

.issue-meta dd {
  margin: 0;
  color: var(--muted);
  font-weight: 700;
}

.workflow-card {
  padding: 22px;
}

.workflow-card .step-marker {
  margin-bottom: 18px;
}

.status-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-color: #ecd7a8;
  background: var(--warning-soft);
}

.status-panel h2 {
  margin-bottom: 0;
}

.status-panel > p {
  max-width: 560px;
}

@media (max-width: 720px) {
  .app-header {
    padding-top: 32px;
  }

  .header-layout,
  .status-panel {
    display: grid;
  }

  .top-nav {
    width: 100%;
  }

  .header-actions {
    justify-items: stretch;
  }

  .app-version {
    text-align: center;
  }

  .top-nav a {
    flex: 1 1 0;
    justify-content: center;
  }

  .workflow-grid,
  .analysis-summary,
  .upload-box,
  .upload-item {
    grid-template-columns: 1fr;
  }

  .upload-item {
    display: grid;
  }

  .upload-actions {
    display: grid;
  }

  .issue-heading,
  .analysis-status,
  .issue-item {
    display: grid;
  }

  .issue-meta {
    min-width: 0;
  }

  button,
  .button-link {
    width: 100%;
  }
}

@media (max-width: 560px) {
  .issue-shift-pair {
    grid-template-columns: minmax(0, 1fr);
  }

  .issue-shift-pair section + section {
    border-top: 1px solid rgba(96, 112, 128, 0.34);
    border-left: 0;
  }
}