:root {
  --text: #1d252c;
  --muted: #65717a;
  --line: #d9e0e5;
  --surface: #ffffff;
  --surface-alt: #f4f7f8;
  --accent: #0f7b63;
  --accent-dark: #0a5d4a;
  --danger: #b42318;
  --shadow: 0 14px 36px rgba(25, 38, 48, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: #eef3f4;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
}

a {
  color: var(--accent-dark);
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: 48px 1fr auto;
  align-items: center;
  gap: 14px;
  min-height: 64px;
  padding: 10px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.brand-title {
  justify-self: center;
  color: var(--text);
  font-size: 22px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
}

.menu-toggle {
  width: 44px;
  height: 44px;
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-alt);
  cursor: pointer;
}

.menu-toggle span {
  width: 100%;
  height: 2px;
  background: var(--text);
}

.logout-button {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  color: #ffffff;
  background: var(--accent);
  border-radius: 8px;
  font-weight: 700;
  text-decoration: none;
}

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

.side-menu {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 40;
  width: min(320px, 86vw);
  height: 100vh;
  padding: 26px 18px;
  background: var(--surface);
  box-shadow: var(--shadow);
  transform: translateX(-105%);
  transition: transform 180ms ease;
}

.side-menu.open {
  transform: translateX(0);
}

.side-menu-title {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.side-menu a {
  display: block;
  margin-bottom: 8px;
  padding: 12px 14px;
  color: var(--text);
  border-radius: 8px;
  text-decoration: none;
}

.side-menu a:hover,
.side-menu a:focus,
.side-menu a.active {
  color: #ffffff;
  background: var(--accent);
}

.menu-overlay {
  position: fixed;
  inset: 0;
  z-index: 30;
  display: none;
  background: rgba(18, 24, 28, 0.36);
}

.menu-overlay.open {
  display: block;
}

.page-heading,
.page-content {
  width: min(1400px, calc(100% - 32px));
  margin: 0 auto;
}

.page-heading {
  padding: 28px 0 10px;
}

.page-heading h1 {
  margin: 0;
  font-size: 28px;
}

.page-content {
  padding: 12px 0 34px;
}

.filters {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) minmax(180px, 260px) auto auto;
  align-items: end;
  gap: 12px;
  margin-bottom: 14px;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.filters label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.filters input,
.filters select {
  min-height: 42px;
  width: 100%;
  padding: 0 12px;
  color: var(--text);
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}

.filters input:focus,
.filters select:focus {
  outline: 3px solid rgba(15, 123, 99, 0.18);
  border-color: var(--accent);
}

.filters button,
.reset-link {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
  border-radius: 8px;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
}

.filters button {
  color: #ffffff;
  background: var(--accent);
  border: 0;
  cursor: pointer;
}

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

.reset-link {
  color: var(--accent-dark);
  border: 1px solid var(--line);
  background: var(--surface-alt);
}

.table-toolbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 14px;
  margin-bottom: 10px;
  color: var(--muted);
  font-weight: 700;
}

.table-toolbar .primary-button {
  margin-right: auto;
}

.table-toolbar p {
  margin: 0;
}

.primary-button,
.table-action {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  border-radius: 8px;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.primary-button {
  color: #ffffff;
  background: var(--accent);
  border: 0;
}

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

.table-action {
  color: var(--accent-dark);
  background: var(--surface-alt);
  border: 1px solid var(--line);
}

.table-wrapper {
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
}

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

thead th {
  color: #ffffff;
  background: #34424a;
  font-weight: 700;
  white-space: nowrap;
}

tbody tr:nth-child(even) {
  background: var(--surface-alt);
}

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

.numeric {
  text-align: right;
  white-space: nowrap;
}

.designation-tooltip {
  cursor: help;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 3px;
}

.empty-state {
  padding: 26px 14px;
  color: var(--muted);
  text-align: center;
}

.alert {
  margin: 0;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.alert.error {
  color: var(--danger);
  border-color: rgba(180, 35, 24, 0.35);
}

.alert.success {
  color: var(--accent-dark);
  border-color: rgba(15, 123, 99, 0.35);
}

.alert.warning {
  color: #76520c;
  border-color: rgba(162, 107, 18, 0.35);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(18, 24, 28, 0.44);
}

.modal-backdrop[hidden] {
  display: none;
}

.modal-panel {
  width: min(980px, 100%);
  height: min(820px, 92vh);
  display: grid;
  grid-template-rows: auto 1fr;
  background: var(--surface);
  border-radius: 8px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}

.modal-header h2 {
  margin: 0;
  font-size: 20px;
}

.modal-close {
  min-height: 36px;
  padding: 0 12px;
  color: var(--accent-dark);
  background: var(--surface-alt);
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.modal-frame {
  width: 100%;
  height: 100%;
  border: 0;
}

.modal-page {
  background: var(--surface);
}

.edit-shell {
  width: min(100%, 900px);
  margin: 0 auto;
  padding: 20px;
}

.edit-shell h1 {
  margin: 0 0 16px;
  font-size: 24px;
}

.article-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.article-form label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.article-form input,
.article-form select,
.article-form textarea {
  width: 100%;
  min-height: 42px;
  padding: 9px 12px;
  color: var(--text);
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}

.article-form textarea {
  resize: vertical;
}

.article-form input:focus,
.article-form select:focus,
.article-form textarea:focus {
  outline: 3px solid rgba(15, 123, 99, 0.18);
  border-color: var(--accent);
}

.article-form .wide {
  grid-column: 1 / -1;
}

.calculation-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: end;
  gap: 10px;
}

.calculation-sign {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  color: var(--muted);
  font-size: 20px;
  font-weight: 700;
}

.inline-fields {
  display: grid;
  gap: 14px;
}

.inline-fields.two-columns {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.form-actions {
  display: flex;
  justify-content: flex-end;
}

.form-actions button {
  min-height: 42px;
  padding: 0 18px;
  color: #ffffff;
  background: var(--accent);
  border: 0;
  border-radius: 8px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

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

.login-page {
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-shell {
  width: min(100%, 420px);
}

.login-form {
  display: grid;
  gap: 12px;
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.login-form h1 {
  margin: 0;
  font-size: 24px;
  text-align: center;
}

.login-form p {
  margin: 0 0 10px;
  color: var(--muted);
  font-weight: 700;
  text-align: center;
}

.login-form label {
  font-weight: 700;
}

.login-form input {
  width: 100%;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}

.login-form input:focus {
  outline: 3px solid rgba(15, 123, 99, 0.18);
  border-color: var(--accent);
}

.login-form button {
  min-height: 44px;
  margin-top: 8px;
  color: #ffffff;
  background: var(--accent);
  border: 0;
  border-radius: 8px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

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

@media (max-width: 640px) {
  .app-header {
    grid-template-columns: 44px 1fr;
  }

  .brand-title {
    font-size: 18px;
  }

  .logout-button {
    grid-column: 1 / -1;
    justify-content: center;
    width: 100%;
  }

  .page-heading,
  .page-content {
    width: min(100% - 20px, 1400px);
  }

  .filters {
    grid-template-columns: 1fr;
  }

  .table-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .table-toolbar .primary-button {
    margin-right: 0;
  }

  .article-form {
    grid-template-columns: 1fr;
  }

  .calculation-row,
  .inline-fields.two-columns {
    grid-template-columns: 1fr;
  }

  .calculation-sign {
    min-height: auto;
    justify-content: center;
  }
}