:root {
  color-scheme: light;
  --ink: #17201c;
  --muted: #5d6b65;
  --line: #ccd8d2;
  --soft: #eef5f1;
  --panel: #ffffff;
  --accent: #177c6b;
  --accent-dark: #0f5b50;
  --warn: #a05c12;
  --danger: #9d2f2f;
  --shadow: 0 12px 30px rgba(30, 49, 43, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #f7faf8;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.45;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.7rem clamp(1rem, 4vw, 2rem);
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
}

.brand {
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  margin-left: auto;
}

.site-nav a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.8rem;
  border-radius: 6px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 650;
}

.site-nav a:hover,
.site-nav a:focus,
.site-nav a.active {
  background: var(--soft);
}

.site-nav a.active {
  box-shadow: inset 0 -2px 0 var(--accent);
}

.site-nav .support-link {
  color: var(--accent-dark);
}

.nav-form {
  display: flex;
}

.nav-button {
  min-height: 44px;
  border-color: transparent;
  background: transparent;
  color: var(--muted);
  padding: 0.55rem 0.8rem;
}

.nav-button:hover,
.nav-button:focus {
  background: var(--soft);
  color: var(--ink);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-left: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
}

.menu-toggle span {
  width: 19px;
  height: 2px;
  background: var(--ink);
}

.page {
  width: min(1180px, calc(100% - 2rem));
  margin: 1.25rem auto 3rem;
}

.auth-shell {
  width: min(24rem, 100%);
  margin: clamp(3rem, 12vh, 7rem) auto 0;
}

.auth-heading {
  margin-bottom: 1rem;
}

.auth-heading h1 {
  margin: 0;
  font-size: 1.8rem;
  letter-spacing: 0;
}

.eyebrow {
  margin: 0 0 0.2rem;
  color: var(--accent-dark);
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
}

.page-header {
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.page-header h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: 0;
}

.lede,
.muted {
  color: var(--muted);
}

.action-row,
.button-row {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  align-items: center;
}

.button,
button {
  min-height: 44px;
  border: 1px solid var(--accent);
  border-radius: 6px;
  padding: 0.58rem 0.9rem;
  background: var(--accent);
  color: white;
  font-weight: 750;
  text-decoration: none;
  cursor: pointer;
  font: inherit;
}

.button.secondary,
button.secondary {
  background: white;
  color: var(--accent-dark);
}

.button.warning,
button.warning {
  background: #fff7ed;
  border-color: #d9892c;
  color: var(--warn);
}

.button.danger,
button.danger {
  background: #fff1f1;
  border-color: #d96868;
  color: var(--danger);
}

.button.small,
button.small {
  min-height: 36px;
  padding: 0.35rem 0.6rem;
  font-size: 0.92rem;
}

.flash-stack,
.error-list {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.flash,
.error-list li {
  padding: 0.7rem 0.85rem;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: white;
}

.flash.success {
  border-color: #92d1b0;
  background: #f0fbf5;
}

.flash.warning,
.error-list li {
  border-color: #edc27b;
  background: #fff9ec;
}

.filters,
.form-card,
.section,
.tank-card,
.species-card,
.reading-summary {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.filters,
.form-card,
.section {
  padding: 1rem;
}

.filters {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  margin-bottom: 1rem;
}

.form-grid {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.field {
  display: grid;
  gap: 0.3rem;
}

label,
.field-label {
  font-weight: 750;
}

input,
select,
textarea {
  width: 100%;
  min-height: 44px;
  border: 1px solid #b7c6bf;
  border-radius: 6px;
  padding: 0.55rem 0.65rem;
  background: white;
  color: var(--ink);
  font: inherit;
}

textarea {
  min-height: 96px;
  resize: vertical;
}

.check-row,
.checkbox-grid {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
}

.check-row input,
.checkbox-grid input {
  width: auto;
  min-height: auto;
}

.checkbox-grid label {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.card-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.tank-card,
.species-card,
.reading-summary {
  padding: 1rem;
}

.tank-card h2,
.species-card h2,
.section h2 {
  margin: 0 0 0.7rem;
  font-size: 1.15rem;
}

.list {
  display: grid;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.list-item {
  padding: 0.7rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fbfdfc;
}

.meta {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.94rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  background: var(--soft);
  color: var(--accent-dark);
  font-weight: 700;
  font-size: 0.84rem;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

th,
td {
  padding: 0.7rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-size: 0.88rem;
}

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

.empty-state {
  padding: 1rem;
  border: 1px dashed #9eb2aa;
  border-radius: 8px;
  background: #fbfdfc;
  color: var(--muted);
}

.stack {
  display: grid;
  gap: 1rem;
}

.unit-grid {
  display: grid;
  gap: 0.9rem;
  grid-template-columns: minmax(0, 1fr) 96px;
}

.inline-form {
  display: inline;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

[hidden] {
  display: none !important;
}

.compact-header {
  margin-bottom: 0.75rem;
}

.compact-header .lede {
  margin: 0.2rem 0 0;
}

.required-mark,
.optional-mark {
  margin-left: 0.35rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 650;
  text-transform: uppercase;
}

.required-mark {
  color: #7d351d;
}

.field-group,
.catalog-picker {
  display: grid;
  gap: 0.8rem;
  padding: 0.9rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.field-group h2,
.catalog-picker h2,
.dashboard-section h2,
.settings-section h2,
.attention-band h2 {
  margin: 0;
  font-size: 1.12rem;
  letter-spacing: 0;
}

.section-heading,
.field-group-heading,
.level-heading,
.dialog-heading,
.list-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.picker-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.5rem;
  align-items: end;
}

.picker-row select {
  min-width: 0;
}

.add-choice-button {
  min-height: 44px;
  white-space: nowrap;
}

.picker-tools {
  max-width: 28rem;
}

.picker-tools input {
  min-height: 38px;
}

.volume-entry {
  display: grid;
  grid-template-columns: minmax(8rem, 1fr) 7rem minmax(9rem, auto);
  gap: 0.5rem;
  align-items: center;
  min-height: 44px;
}

.converted-value {
  min-width: 9rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.optional-details,
.more-filters {
  border-top: 1px solid var(--line);
  padding-top: 0.75rem;
}

.optional-details > summary,
.more-filters > summary,
.settings-section > summary {
  cursor: pointer;
  font-weight: 750;
}

.optional-details[open] > summary,
.more-filters[open] > summary,
.settings-section[open] > summary {
  margin-bottom: 0.8rem;
}

.stack.compact {
  gap: 0.65rem;
}

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

.parameter-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(135px, 1fr));
  gap: 0.75rem;
}

.catalog-level {
  display: grid;
  gap: 0.4rem;
}

.catalog-level.is-skippable label::after {
  content: " (none listed)";
  color: var(--muted);
  font-weight: 500;
}

.catalog-path,
.selected-path {
  color: var(--accent-dark);
  font-size: 0.92rem;
  font-weight: 750;
}

.selected-path {
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
  padding: 0.7rem;
  background: var(--soft);
  border-radius: 6px;
}

.text-button {
  width: auto;
  min-height: auto;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--accent-dark);
  font-size: 0.9rem;
}

.duplicate-warning,
.attention-band {
  padding: 0.9rem 1rem;
  border: 1px solid #e2ad5c;
  border-left: 4px solid #c47716;
  border-radius: 6px;
  background: #fff9ed;
  margin-bottom: 1rem;
}

.duplicate-warning p {
  margin: 0.25rem 0 0.7rem;
}

.quick-entry {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 0.85rem;
}

.summary-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 1.2rem;
}

.summary-strip a {
  display: grid;
  gap: 0.1rem;
  min-width: 0;
  padding: 0.75rem;
  border-right: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
}

.summary-strip a:last-child {
  border-right: 0;
}

.summary-strip strong {
  font-size: 1.35rem;
  font-variant-numeric: tabular-nums;
}

.summary-strip span {
  color: var(--muted);
  font-size: 0.86rem;
}

.dashboard-section {
  margin: 1.25rem 0;
}

.dashboard-section > .section-heading,
.attention-band > .section-heading {
  margin-bottom: 0.65rem;
}

.tank-overview {
  border-top: 1px solid var(--line);
}

.tank-overview-head,
.tank-overview-row {
  display: grid;
  grid-template-columns: minmax(12rem, 1.35fr) minmax(9rem, 1fr) 5rem minmax(10rem, 1fr) minmax(9rem, 0.9fr) minmax(9rem, 0.8fr);
  gap: 0.75rem;
  align-items: center;
}

.tank-overview-head {
  padding: 0.55rem 0.65rem;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 750;
}

.tank-overview-row {
  padding: 0.75rem 0.65rem;
  border-top: 1px solid var(--line);
}

.tank-overview-row > div,
.tank-main {
  display: grid;
  gap: 0.15rem;
  min-width: 0;
}

.row-actions {
  display: flex !important;
  flex-wrap: wrap;
  gap: 0.3rem 0.6rem !important;
  font-size: 0.88rem;
}

.attention-list,
.compact-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.attention-list {
  display: grid;
  gap: 0.35rem;
}

.compact-list li {
  display: grid;
  grid-template-columns: 8.5rem minmax(9rem, 0.8fr) minmax(8rem, 0.7fr) minmax(0, 1.3fr);
  gap: 0.55rem;
  padding: 0.55rem 0;
  border-top: 1px solid var(--line);
}

.compact-list time {
  color: var(--muted);
  font-size: 0.88rem;
}

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.prominent-empty {
  max-width: 40rem;
  padding: 1.5rem;
}

.prominent-empty h2 {
  margin-top: 0;
}

.tank-detail-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.tank-detail-summary > div {
  display: grid;
  gap: 0.15rem;
  padding: 0.7rem;
  border-right: 1px solid var(--line);
}

.tank-detail-summary > div:last-child {
  border-right: 0;
}

.tank-detail-summary span {
  color: var(--muted);
  font-size: 0.8rem;
}

.dashboard-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.compact-list.single-column li {
  grid-template-columns: 1fr;
}

.activity-filters {
  grid-template-columns: repeat(2, minmax(180px, 1fr)) auto;
}

.activity-filters .more-filters {
  grid-column: 1 / -1;
}

.filter-count {
  display: inline-block;
  margin-left: 0.4rem;
  color: var(--accent-dark);
  font-size: 0.82rem;
}

.conditional-section {
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
}

.relationship-toggle {
  justify-self: start;
}

.choice-dialog {
  width: min(28rem, calc(100% - 1.5rem));
  max-height: calc(100vh - 2rem);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem;
  box-shadow: 0 20px 60px rgba(20, 35, 29, 0.22);
}

.choice-dialog::backdrop {
  background: rgba(23, 32, 28, 0.42);
}

.choice-dialog h2 {
  margin: 0;
  font-size: 1.15rem;
}

.icon-button {
  width: 40px;
  min-height: 40px;
  padding: 0;
  font-size: 1.4rem;
}

.form-message {
  min-height: 1.2rem;
  margin: 0;
  color: var(--danger);
}

.settings-tools {
  display: grid;
  grid-template-columns: auto minmax(12rem, 28rem);
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1rem;
}

.settings-section {
  padding: 0.9rem 0;
  border-top: 1px solid var(--line);
}

.settings-section > summary {
  display: flex;
  list-style: none;
}

.settings-section > summary::-webkit-details-marker {
  display: none;
}

.settings-section > summary::after {
  content: "+";
  margin-left: auto;
  color: var(--muted);
}

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

.settings-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

.settings-section h3 {
  margin: 0.75rem 0 0.45rem;
  font-size: 1rem;
}

.settings-add,
.settings-item,
.settings-item form,
.settings-preferences {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: end;
}

.settings-add {
  padding: 0.55rem;
  background: var(--soft);
  border-radius: 6px;
}

.settings-add input,
.settings-add select,
.settings-item input,
.settings-item select {
  width: auto;
  min-width: 8rem;
  flex: 1 1 9rem;
}

.settings-add button,
.settings-item button,
.settings-preferences button {
  width: auto;
}

.settings-list,
.catalog-settings,
.nested-reference {
  display: grid;
  gap: 0.35rem;
}

.settings-item {
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--line);
}

.settings-item > form:first-child {
  flex: 1 1 28rem;
}

.strong-row {
  font-weight: 750;
}

.inset {
  margin-left: 1rem;
}

.nested-reference {
  margin-left: 1rem;
  padding-left: 0.75rem;
  border-left: 2px solid var(--line);
}

.deepest {
  margin-left: 1rem;
}

.order-input {
  max-width: 5rem;
}

.input-suffix {
  display: grid;
  grid-template-columns: minmax(5rem, 1fr) auto;
  align-items: center;
  gap: 0.4rem;
}

.tank-checkboxes label {
  flex: 1 1 12rem;
}

@media (max-width: 720px) {
  .topbar {
    flex-wrap: wrap;
    padding: 0.55rem 1rem;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    width: 100%;
    margin-left: 0;
    padding-top: 0.4rem;
    border-top: 1px solid var(--line);
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.35rem;
  }

  .site-nav.open {
    display: grid;
  }

  .site-nav a {
    min-height: 40px;
    padding: 0.45rem 0.55rem;
  }

  .nav-form,
  .nav-button {
    width: 100%;
  }

  .nav-button {
    justify-content: flex-start;
    text-align: left;
  }

  .page {
    width: min(100% - 1rem, 1180px);
    margin-top: 0.75rem;
  }

  .page-header {
    display: grid;
  }

  .page-header h1 {
    font-size: 1.65rem;
  }

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

  .button,
  button {
    width: 100%;
    justify-content: center;
  }

  .button.small,
  button.small {
    width: auto;
  }

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

  .quick-entry {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .quick-entry .button,
  .add-choice-button,
  .settings-add button,
  .settings-item button,
  .relationship-toggle,
  .text-button,
  .icon-button {
    width: auto;
  }

  .quick-entry .button {
    min-width: 0;
    padding: 0.45rem 0.4rem;
    text-align: center;
  }

  .summary-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tank-detail-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tank-detail-summary > div:nth-child(2) {
    border-right: 0;
  }

  .tank-detail-summary > div:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .dashboard-columns {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .summary-strip a:nth-child(2) {
    border-right: 0;
  }

  .summary-strip a:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .tank-overview-head {
    display: none;
  }

  .tank-overview-row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .tank-main,
  .tank-overview-row .row-actions {
    grid-column: 1 / -1;
  }

  .tank-overview-row > div:not(.tank-main)::before {
    content: attr(data-label);
    color: var(--muted);
    font-size: 0.75rem;
    font-weight: 750;
  }

  .compact-list li {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .truncate {
    white-space: normal;
  }

  .picker-row {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .add-choice-button {
    min-height: 44px;
    padding-inline: 0.6rem;
  }

  .volume-entry {
    grid-template-columns: minmax(0, 1fr) 6.5rem;
  }

  .converted-value {
    grid-column: 1 / -1;
    min-height: 1.4rem;
  }

  .parameter-grid,
  .compact-grid,
  .settings-columns,
  .activity-filters {
    grid-template-columns: 1fr;
  }

  .activity-filters .more-filters {
    grid-column: auto;
  }

  .settings-tools {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }

  .settings-add,
  .settings-item,
  .settings-item form,
  .settings-preferences {
    align-items: stretch;
  }

  .settings-item > form:first-child {
    flex-basis: 100%;
  }

  .settings-add input,
  .settings-add select,
  .settings-item input,
  .settings-item select {
    width: 100%;
  }

  .responsive-cards table,
  .responsive-cards thead,
  .responsive-cards tbody,
  .responsive-cards th,
  .responsive-cards td,
  .responsive-cards tr {
    display: block;
    min-width: 0;
  }

  .responsive-cards thead {
    display: none;
  }

  .responsive-cards tr {
    border-bottom: 1px solid var(--line);
    padding: 0.65rem;
  }

  .responsive-cards td {
    border: 0;
    display: grid;
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 0.5rem;
    padding: 0.35rem 0;
  }

  .responsive-cards td::before {
    content: attr(data-label);
    color: var(--muted);
    font-weight: 750;
  }
}