:root {
  --bg: #ffffff;
  --bg2: #ffffff;
  --panel: #ffffff;
  --border: rgba(15, 23, 42, 0.12);
  --text: #0f172a;
  --muted: rgba(15, 23, 42, 0.62);
  --shadow: 0 14px 40px rgba(15, 23, 42, 0.12);
  --focus: rgba(79, 136, 61, 0.25);
  --green: #4f883d;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Helvetica,
    Arial;
  background: var(--bg);
  color: var(--text);
}

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 18px;
}

.topbar {
  display: flex;
  gap: 14px;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 14px;
}

h1 {
  margin: 0;
  font-size: 26px;
  letter-spacing: -0.02em;
}

.sub {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 16px;
  align-items: start;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.panelHeader,
.previewHeader {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}

.panelHeader h2 {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.01em;
}

.panelBody {
  padding: 14px;
  display: grid;
  gap: 12px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.04);
  border: 1px solid var(--border);
  color: rgba(15, 23, 42, 0.8);
  font-size: 12px;
}

label {
  display: block;
  font-size: 12px;
  color: rgba(15, 23, 42, 0.7);
  margin-bottom: 6px;
}

input[type='text'],
input[type='number'],
select,
textarea {
  width: 100%;
  color: var(--text);
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  outline: none;
}

textarea {
  resize: vertical;
  min-height: 74px;
}

input:focus,
select:focus,
textarea:focus {
  border-color: rgba(79, 136, 61, 0.55);
  box-shadow: 0 0 0 4px var(--focus);
}

.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.toggle {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.03);
}

.toggle input {
  width: 16px;
  height: 16px;
  margin-top: 2px;
}

.toggleTitle {
  font-size: 13px;
  font-weight: 650;
}

.toggleDesc {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.btnRow {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button {
  appearance: none;
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 11px 14px;
  font-size: 14px;
  font-weight: 650;
  color: #ffffff;
  background: #111827;
  cursor: pointer;
}

button.primaryBtn {
  font-size: 16px;
  padding: 12px 16px;
}

button.secondary {
  background: #ffffff;
  border-color: var(--border);
  color: rgba(15, 23, 42, 0.92);
}

button.pdfBtn {
  background: var(--green);
  border-color: rgba(15, 23, 42, 0.1);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.hint {
  font-size: 12px;
  color: var(--muted);
}

#message .error,
#message .ok {
  margin-top: 4px;
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 13px;
}

#message .error {
  border: 1px solid rgba(239, 68, 68, 0.45);
  background: rgba(239, 68, 68, 0.08);
}

#message .ok {
  border: 1px solid rgba(34, 197, 94, 0.45);
  background: rgba(34, 197, 94, 0.08);
}

.picker {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  background: rgba(15, 23, 42, 0.02);
}

.pickerRow {
  display: grid;
  grid-template-columns: auto auto 34px;
  gap: 10px;
  align-items: center;
}

.pickerImg {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  object-fit: contain;
}

.pickerName {
  font-size: 12px;
  color: rgba(15, 23, 42, 0.75);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.previewPanel {
  min-width: 0;
}

.pages {
  padding: 16px;
  display: grid;
  gap: 16px;
  justify-content: center;
  --scale: var(--previewScale, 1);
}

.pageWrap {
  width: calc(210mm * var(--scale));
  height: calc(297mm * var(--scale));
  overflow: hidden;
  border-radius: 12px;
  box-shadow: 0 18px 50px rgba(15, 23, 42, 0.18);
  background: #fff;
}

.page {
  width: 210mm;
  height: 297mm;
  background: #fff;
  color: #111827;
  padding: 14mm 14mm;
  transform: scale(var(--scale));
  transform-origin: top left;
  display: flex;
  flex-direction: column;
}

.sheetHeader {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 18px;
  margin-bottom: 10px;
  font-size: 12px;
}

.field {
  display: flex;
  gap: 10px;
  align-items: baseline;
}

.exporting .sheetHeader .field.headBig {
  font-size: 14px;
  font-weight: 700;
}

.exporting .sheetHeader .field.headBig .line {
  height: 2px;
  transform: translateY(-1px);
}

.line {
  flex: 1;
  height: 1px;
  background: #9ca3af;
  transform: translateY(-2px);
}

.sheetTitle {
  margin: 10px 0 12px;
  text-align: center;
  font-size: 20px;
  letter-spacing: -0.01em;
}

.problems {
  display: grid;
  gap: 12px;
  flex: 1;
}

.problem {
  border-top: 0;
  padding-top: 0;
  break-inside: avoid;
}

.equation {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 10px;
  align-items: end;
}

.blank {
  position: relative;
  height: 18px;
  border-bottom: 2px solid rgba(17, 24, 39, 0.65);
}

.blank .num {
  position: absolute;
  left: 0;
  bottom: 6px;
  font-size: 14px;
  color: rgba(17, 24, 39, 0.7);
}

.pageBottom {
  margin-top: auto;
  padding-top: 6mm;
}

.watermark {
  display: none;
  margin-top: 2mm;
  text-align: center;
  font-size: 10px;
  color: rgba(17, 24, 39, 0.35);
}

.op {
  font-size: 20px;
  font-weight: 800;
  padding-bottom: 2px;
}

.pictos {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 10px;
  margin-top: 10px;
  align-items: start;
}

.pics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-height: 28px;
}

.pic {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

.mutedPics .pic {
  filter: grayscale(1);
  opacity: 0.38;
}

.footerText {
  margin-top: 0;
  font-size: 12px;
  color: rgba(17, 24, 39, 0.75);
}

.answerList {
  margin-top: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 14px;
  font-size: 14px;
}

.answerItem {
  padding: 8px 10px;
  border: 1px solid rgba(17, 24, 39, 0.12);
  border-radius: 10px;
  background: rgba(17, 24, 39, 0.03);
}

.footnote {
  margin-top: 12px;
  color: rgba(15, 23, 42, 0.6);
  font-size: 12px;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.4);
  display: grid;
  place-items: center;
  padding: 18px;
  z-index: 50;
}

.modal[hidden] {
  display: none !important;
}

.modalCard {
  width: min(920px, 100%);
  max-height: min(80vh, 760px);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 22px 80px rgba(15, 23, 42, 0.25);
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 1fr;
}

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

.modalTitle {
  font-size: 14px;
  font-weight: 750;
}

.modalSub {
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}

.iconBtn {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
  color: rgba(15, 23, 42, 0.85);
  font-size: 20px;
  line-height: 0;
}

.modalBody {
  padding: 12px;
  display: grid;
  gap: 12px;
}

.modalFooter {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.thumbGrid {
  padding: 0;
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 10px;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.02);
  padding: 10px;
  max-height: 48vh;
}

@media (max-width: 860px) {
  .thumbGrid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.thumb {
  position: relative;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
  padding: 8px;
  display: grid;
  place-items: center;
  cursor: pointer;
}

.thumb img {
  width: 44px;
  height: 44px;
  object-fit: contain;
}

.thumb.selected {
  border-color: rgba(79, 136, 61, 0.9);
  box-shadow: 0 0 0 4px rgba(79, 136, 61, 0.2);
}

.thumb .tag {
  position: absolute;
  left: 8px;
  top: 8px;
  font-size: 11px;
  padding: 3px 7px;
  border-radius: 999px;
  background: rgba(79, 136, 61, 0.9);
  color: #ffffff;
  font-weight: 800;
  display: none;
}

.thumb.selected .tag {
  display: inline-flex;
}

.exporting .page {
  transform: none !important;
}

.exporting .pageWrap {
  width: 210mm !important;
  height: 297mm !important;
}

.exporting .problem {
  border-top: 0 !important;
}

.exporting .blank .num {
  font-size: 16px;
  font-weight: 800;
  color: rgba(17, 24, 39, 0.85);
}

.exporting .watermark {
  display: block;
}