:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --panel-alt: #f9fafb;
  --text: #1f2933;
  --muted: #6b7280;
  --border: #d8dde6;

  --accent: #2563eb;
  --accent-soft: #e8f0ff;

  --warning-bg: #fff8e1;
  --warning-border: #f5c542;
  --error-bg: #fdecec;
  --error-border: #e0524a;

  --table-bg: #ffffff;
  --radius: 9px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);

  color-scheme: light dark;
}

/* Follows the OS/browser color scheme. This only affects the on-screen
   app UI - exported/saved files (HTML/RTF/MD/plain text) always render
   with the light palette, regardless of this setting. */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181d;
    --panel: #1d2026;
    --panel-alt: #22252c;
    --text: #e5e7eb;
    --muted: #9aa3b2;
    --border: #343841;

    --accent: #5b9dff;
    --accent-soft: #22314f;

    --warning-bg: #3a2f0d;
    --warning-border: #caa03a;
    --error-bg: #3a1e1c;
    --error-border: #e0716a;

    --table-bg: #000000;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

* {
  box-sizing: border-box;
}

html {
  font-size: 14px;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.4;
  color: var(--text);
  background: var(--bg);
}

button,
select,
input {
  font: inherit;
}

button {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 0.4rem 0.7rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.88rem;
}

button:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

button.loaded {
  border-color: var(--accent);
  background: var(--accent-soft);
  font-weight: 600;
}

.hidden {
  display: none;
}

header.app-header {
  padding: 1rem 1.25rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

header.app-header h1 {
  margin: 0;
  font-size: 1.2rem;
}

header.app-header p {
  margin: 0.2rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.25rem;
  display: grid;
  gap: 1rem;
}

section.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 1.1rem;
}

section.panel h2 {
  margin: 0 0 0.7rem;
  font-size: 0.95rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

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

.load-row button {
  min-width: 110px;
}

.slot {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  min-width: 130px;
  padding: 0.55rem 1.6rem 0.55rem 0.7rem;
  border: 1.5px dashed var(--border);
  border-radius: 8px;
  background: var(--panel-alt);
  cursor: pointer;
  text-align: center;
  user-select: none;
  transition: border-color 0.12s ease, background 0.12s ease;
}

.slot:hover:not(.is-disabled) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.slot:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.slot .slot-label {
  font-size: 0.88rem;
  font-weight: 600;
  max-width: 12rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.slot .slot-hint {
  font-size: 0.72rem;
  color: var(--muted);
}

.slot.is-disabled {
  cursor: not-allowed;
  opacity: 0.5;
  border-style: solid;
}

.slot.is-disabled .slot-hint {
  visibility: hidden;
}

.slot.is-loaded {
  border-style: solid;
  border-color: var(--accent);
  background: var(--accent-soft);
}

.slot.is-loaded .slot-hint {
  display: none;
}

.slot.is-dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 0 2px var(--accent) inset;
}

.load-row .slot-clear {
  position: absolute;
  top: 0.3rem;
  right: 0.3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.1rem;
  height: 1.1rem;
  min-width: 0;
  max-width: 1.1rem;
  padding: 0;
  margin: 0;
  line-height: 1;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--panel);
  color: var(--text);
  font-size: 0.82rem;
  font-weight: 700;
  opacity: 0.85;
  z-index: 1;
  transition: opacity 0.12s ease, color 0.12s ease, background 0.12s ease, border-color 0.12s ease;
}

.load-row .slot-clear:hover {
  color: #fff;
  background: #d64545;
  border-color: #d64545;
  opacity: 1;
}

.load-row .slot-clear:focus-visible {
  opacity: 1;
  outline: 1px solid var(--accent);
  outline-offset: 2px;
}

.option-row label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel-alt);
  font-size: 0.86rem;
}

.option-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.option-group-title {
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

#warnings-box {
  background: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: 6px;
  padding: 0.6rem 0.8rem;
  font-size: 0.85rem;
}

#warnings-box ul {
  margin: 0.3rem 0 0;
  padding-left: 1.1rem;
}

.report-preview {
  background: var(--panel-alt);
  border: 1px solid var(--border);
  border-radius: 7px;
  padding: 1rem;
  overflow-x: auto;
}

.report-preview h2 {
  margin-top: 0;
  font-size: 1rem;
  color: var(--text);
  text-transform: none;
  letter-spacing: normal;
}

.report-preview .empty-hint {
  color: var(--muted);
  font-style: italic;
}

table.tm-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  background: var(--table-bg);
}

table.tm-table th,
table.tm-table td {
  border: none;
  padding: 0.34rem 0.5rem;
  vertical-align: top;
  text-align: left;
}

table.tm-table thead th {
  font-weight: 600;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

table.tm-table tbody tr.tm-row-first td {
  border-top: 1px solid var(--border);
}

table.tm-table tbody tr.tm-row-last td {
  border-bottom: 1px solid var(--border);
}

table.tm-table td:first-child {
  white-space: nowrap;
  color: var(--muted);
}

.toast {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  background: #1f2933;
  color: #fff;
  padding: 0.55rem 0.9rem;
  border-radius: 6px;
  font-size: 0.85rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.15s ease, transform 0.15s ease;
  z-index: 50;
}

.toast.visible {
  opacity: 1;
  transform: translateY(0);
}

.toast.warning {
  background: #92660a;
}

.toast.error {
  background: var(--error-border);
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.78rem;
  padding: 1rem;
}

/* -- Multi-block CIF picker ------------------------------------------- */

.modal-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(15, 17, 21, 0.5);
  z-index: 100;
  padding: 1rem;
}

.modal-overlay.hidden {
  display: none;
}

.modal {
  width: 100%;
  max-width: 30rem;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem 1.4rem;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25);
}

.modal h2 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

.modal-hint {
  margin: 0 0 0.8rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.block-picker-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  overflow-y: auto;
  padding-right: 0.2rem;
  margin-bottom: 0.9rem;
}

.block-picker-item {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.88rem;
}

.block-picker-item:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.block-picker-item input {
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.block-picker-name {
  font-weight: 600;
  white-space: nowrap;
}

.block-picker-formula {
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.modal-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.modal-actions-left,
.modal-actions-right {
  display: flex;
  gap: 0.5rem;
}

.link-btn {
  border: none;
  background: transparent;
  color: var(--accent);
  padding: 0.3rem 0.2rem;
  font-size: 0.85rem;
  text-decoration: underline;
}

.link-btn:hover:not(:disabled) {
  background: transparent;
  border: none;
}