:root {
  color-scheme: light;
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #b91c1c;
  --danger-bg: #fee2e2;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.hidden { display: none !important; }
.eyebrow {
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.login-view {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-card {
  width: min(420px, 100%);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 24px 80px rgba(15, 23, 42, 0.12);
}
.login-card h1, .topbar h1, .panel h2 { margin: 6px 0; }
.login-card p, .topbar p, .panel p { margin: 0; color: var(--muted); }

.app {
  min-height: 100vh;
  padding: 24px;
}
.topbar {
  max-width: 1600px;
  margin: 0 auto 20px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}
.top-actions, .button-row {
  display: flex;
  gap: 10px;
  align-items: center;
}
.button-row {
  flex-wrap: wrap;
}
.button-row button {
  flex: 1 1 120px;
}

label {
  display: grid;
  gap: 8px;
  color: #334155;
  font-size: 14px;
  font-weight: 600;
}
input, select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: white;
  color: var(--text);
  padding: 0 12px;
  font: inherit;
}
input[type="radio"] {
  width: 16px;
  min-height: 16px;
  accent-color: var(--primary);
}
button, .secondary-button, .ghost-button {
  min-height: 42px;
  border: 0;
  border-radius: 10px;
  padding: 0 16px;
  background: var(--primary);
  color: white;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
button:hover { background: var(--primary-dark); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
.secondary-button {
  border: 1px solid var(--line);
  background: white;
  color: var(--text);
}
.ghost-button {
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
}

.summary-grid, .workspace {
  max-width: 1600px;
  margin: 0 auto;
}
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}
.summary-card, .panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 12px 40px rgba(15, 23, 42, 0.05);
}
.summary-card {
  padding: 22px;
  display: grid;
  gap: 6px;
}
.summary-card span, .summary-card small, .details-grid span {
  color: var(--muted);
  font-size: 13px;
}
.summary-card strong {
  font-size: 30px;
}
.workspace {
  display: grid;
  grid-template-columns: 420px minmax(0, 1fr);
  gap: 16px;
}
.panel { padding: 20px; }
.controls { display: grid; gap: 18px; align-content: start; }

.product-header {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}
.product-header span {
  color: var(--muted);
  font-size: 12px;
}
.product-list {
  height: 360px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 8px;
}
.product-item {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  border: 1px solid transparent;
  background: white;
  color: var(--text);
  border-radius: 12px;
  padding: 12px;
  text-align: left;
}
.product-item:hover { background: #f8fafc; }
.product-item.active {
  border-color: var(--primary);
  background: #eff6ff;
}
.product-name {
  font-weight: 700;
  line-height: 1.25;
}
.product-meta, .product-stats {
  color: var(--muted);
  font-size: 12px;
}
.product-stats { text-align: right; white-space: nowrap; }
.selected-product {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #f8fafc;
  padding: 14px;
  font-size: 14px;
}
.date-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.model-options {
  border: 1px solid var(--line);
  border-radius: 12px;
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 12px;
}
.model-options legend {
  color: #334155;
  font-size: 14px;
  font-weight: 700;
  padding: 0 4px;
}
.model-options label {
  align-items: center;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  font-weight: 600;
  gap: 8px;
  min-height: 32px;
  padding: 4px 2px;
}
.chart-panel { min-width: 0; }
.panel-heading {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.chart-wrap {
  height: 500px;
  margin-top: 18px;
}
.forecast-chart {
  width: 100%;
  height: 100%;
}
.forecast-chart .nsewdrag {
  cursor: grab;
}
.forecast-chart .nsewdrag:active {
  cursor: grabbing;
}
.details-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}
.details-grid div {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f8fafc;
  padding: 14px;
  display: grid;
  gap: 4px;
}

h3 {
  margin: 24px 0 12px;
  font-size: 16px;
}
.monthly-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.monthly-grid .summary-card {
  padding: 14px;
}
.error, .error-panel {
  color: var(--danger);
  background: var(--danger-bg);
  border-radius: 12px;
  padding: 12px;
}
.error-panel {
  max-width: 1600px;
  margin: 0 auto 16px;
  border: 1px solid #fecaca;
}

.seasonality-dialog {
  width: min(1120px, calc(100vw - 32px));
  max-width: none;
  max-height: 92vh;
  margin: auto;
  padding: 0;
  border: 0;
  border-radius: 20px;
  background: var(--card);
  color: var(--text);
  box-shadow: 0 30px 100px rgba(15, 23, 42, 0.28);
}
.seasonality-dialog::backdrop {
  background: rgba(15, 23, 42, 0.58);
  backdrop-filter: blur(2px);
}
.seasonality-modal {
  max-height: 92vh;
  overflow-y: auto;
  padding: 24px;
}
.seasonality-modal-header,
.seasonality-section-heading,
.seasonality-active-version,
.seasonality-change-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.seasonality-modal-header {
  align-items: flex-start;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.seasonality-modal-header h2 {
  margin: 6px 0;
}
.seasonality-modal-header p,
.seasonality-section p {
  margin: 0;
  color: var(--muted);
}
.icon-button {
  width: 42px;
  min-width: 42px;
  padding: 0;
  border: 1px solid var(--line);
  background: white;
  color: var(--muted);
  font-size: 26px;
  line-height: 1;
}
.icon-button:hover {
  background: #f8fafc;
  color: var(--text);
}
.seasonality-modal > .error,
.seasonality-modal > .notice {
  margin-top: 16px;
}
.notice {
  padding: 12px;
  border: 1px solid #bbf7d0;
  border-radius: 12px;
  background: #f0fdf4;
  color: #166534;
}
.seasonality-section {
  margin-top: 16px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: white;
}
.seasonality-section h3 {
  margin: 0 0 5px;
}
.seasonality-active-version {
  margin-top: 14px;
  padding: 14px;
  border-radius: 12px;
  background: #f8fafc;
}
.seasonality-import-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 8px 14px;
  margin-top: 16px;
}
.seasonality-import-form small {
  grid-column: 1 / -1;
  color: var(--muted);
}
.seasonality-import-form input[type="file"] {
  padding: 8px 10px;
}
.seasonality-import-form input[type="file"]::file-selector-button {
  margin-right: 10px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-weight: 600;
}
.seasonality-summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
  margin-top: 14px;
}
.seasonality-summary-grid > div {
  display: grid;
  gap: 4px;
  padding: 12px;
  border-radius: 10px;
  background: #f8fafc;
}
.seasonality-summary-grid span {
  color: var(--muted);
  font-size: 12px;
  text-transform: capitalize;
}
.seasonality-summary-grid strong {
  font-size: 20px;
}
.warning-panel {
  margin-top: 14px;
  padding: 12px;
  border: 1px solid #fde68a;
  border-radius: 12px;
  background: #fffbeb;
  color: #92400e;
}
.warning-panel ul {
  margin: 8px 0 0;
  padding-left: 20px;
}
.seasonality-change-heading {
  margin: 18px 0 8px;
}
.seasonality-table-wrap {
  max-width: 100%;
  max-height: 360px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}
.seasonality-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.seasonality-table th,
.seasonality-table td {
  padding: 11px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: middle;
}
.seasonality-table th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: #f8fafc;
  color: #475569;
  font-size: 12px;
  white-space: nowrap;
}
.seasonality-table tr:last-child td {
  border-bottom: 0;
}
.seasonality-table td strong,
.seasonality-table td small {
  display: block;
}
.seasonality-table td small {
  max-width: 280px;
  margin-top: 3px;
  color: var(--muted);
}
.seasonality-table-actions {
  display: flex;
  gap: 6px;
  white-space: nowrap;
}
.table-button {
  min-height: 32px;
  padding: 0 10px;
  border-radius: 8px;
  font-size: 12px;
}
.status-badge {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}
.status-active {
  background: #dcfce7;
  color: #166534;
}
.status-draft {
  background: #dbeafe;
  color: #1d4ed8;
}
.status-archived {
  background: #f1f5f9;
  color: #475569;
}
.seasonality-empty {
  padding: 18px;
  color: var(--muted);
  text-align: center !important;
}

@media (max-width: 1100px) {
  .workspace { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .app { padding: 16px; }
  .topbar, .top-actions, .summary-grid, .date-grid, .details-grid, .monthly-grid {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: stretch;
  }
  .seasonality-dialog {
    width: calc(100vw - 16px);
    max-height: 96vh;
    border-radius: 16px;
  }
  .seasonality-modal {
    max-height: 96vh;
    padding: 16px;
  }
  .seasonality-modal-header,
  .seasonality-section-heading,
  .seasonality-active-version {
    align-items: stretch;
  }
  .seasonality-modal-header {
    flex-direction: row;
  }
  .seasonality-section-heading,
  .seasonality-active-version {
    flex-direction: column;
  }
  .seasonality-import-form {
    grid-template-columns: 1fr;
  }
  .seasonality-import-form small {
    grid-column: 1;
  }
}