/* ============================================================
   Design tokens
   ============================================================ */
:root {
  --page-width: 210mm;
  --page-height: 297mm;
  --page-padding: 12mm;

  --primary:      #4F6EF7;
  --primary-dark: #3B57E0;
  --primary-bg:   #EEF2FF;

  --text:    #0F172A;
  --text-sub: #64748B;
  --border:  #E2E8F0;
  --bg:      #F1F5F9;
  --card:    #FFFFFF;
  --danger:  #EF4444;

  --shadow-card: 0 1px 3px rgba(15,23,42,.05), 0 4px 16px rgba(15,23,42,.05);
  --radius: 10px;
}

/* ============================================================
   Reset / base
   ============================================================ */
* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* ============================================================
   Layout
   ============================================================ */
.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px;
}

.controls, .panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

.controls { padding: 24px 28px 20px; margin-bottom: 20px; }

/* ============================================================
   Brand
   ============================================================ */
.brand-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.3px;
}
.brand-title.center, .brand-subtitle.center { text-align: center; }
.brand-subtitle { color: var(--text-sub); font-size: 13px; margin-top: 3px; }

/* ============================================================
   Link button
   ============================================================ */
.link-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text-sub);
  text-decoration: none;
  font-size: 13px;
  font-weight: 500;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.link-btn:hover {
  background: var(--bg);
  border-color: #B0BDCF;
  color: var(--text);
}

/* ============================================================
   Form controls
   ============================================================ */
.field { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
.field label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-sub);
  letter-spacing: 0.2px;
}

input, select, textarea, button {
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 0 12px;
  font-size: 14px;
  background: var(--card);
  font-family: inherit;
  color: var(--text);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input, select, button { height: 38px; }

input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 110, 247, 0.10);
}

button {
  cursor: pointer;
  font-weight: 600;
  padding: 0 18px;
  transition: all 0.15s ease;
}
button:hover:not(:disabled) { filter: brightness(0.93); }
button:active:not(:disabled) { transform: translateY(1px); }

button.primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
button.primary:hover:not(:disabled) {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  filter: none;
}
button:disabled { opacity: 0.4; cursor: not-allowed; }

/* ============================================================
   Public page — header
   ============================================================ */
.public-header {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 22px;
  padding: 0 44px;
}
.admin-entry {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
}

/* ============================================================
   Public page — form row & actions
   ============================================================ */
.public-form-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(190px, 230px));
  justify-content: center;
  gap: 14px;
  margin-bottom: 16px;
}

.public-action-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  min-height: 38px;
}
.public-action-row button { min-width: 150px; }

.public-status {
  text-align: center;
  margin-top: 12px;
  color: var(--text-sub);
  font-size: 13px;
  min-height: 20px;
}

.hidden-step {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  width: 0;
  min-width: 0;
  padding: 0;
  margin: 0;
  border: 0;
  overflow: hidden;
}

/* ============================================================
   Paper preview
   ============================================================ */
.paper-wrap { display: flex; justify-content: center; }

.paper {
  width: var(--page-width);
  height: var(--page-height);
  background: #fff;
  padding: var(--page-padding);
  box-shadow:
    0 2px 4px  rgba(15,23,42,.04),
    0 8px 24px rgba(15,23,42,.08),
    0 40px 80px rgba(15,23,42,.06);
  border-radius: 2px;
  overflow: hidden;
  border-top: 3px solid var(--primary);
}

.paper-inner { height: 100%; font-size: 15px; line-height: 1.55; }
.paper-header { margin-bottom: 7mm; }
.paper-title  { margin: 0 0 3mm; text-align: center; font-size: 22px; font-weight: 800; letter-spacing: .5px; }
.paper-subtitle { text-align: center; font-size: 14px; margin-bottom: 5mm; color: var(--text-sub); }
.paper-meta   { display: flex; justify-content: space-between; gap: 16px; font-size: 14px; margin-bottom: 2mm; }
.paper-meta .line-text {
  min-width: 140px;
  display: inline-block;
  border-bottom: 1px solid #222;
  height: 22px;
  vertical-align: bottom;
}

.section { margin-top: 6mm; break-inside: avoid; page-break-inside: avoid; }
.section-title { font-size: 18px; font-weight: 800; margin: 0 0 3mm; }
.grid-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(43mm, 1fr)); gap: 2.8mm 6mm; }
.grid-item { white-space: nowrap; font-size: 15px; min-width: 0; }
.sentence-list { display: flex; flex-direction: column; gap: 3.5mm; }
.sentence-item { font-size: 15px; break-inside: avoid; page-break-inside: avoid; }
.answer-line { border-bottom: 1px solid #111; height: 7mm; margin-top: 1.8mm; }

/* ============================================================
   Paper — compact levels (functional, preserved as-is)
   ============================================================ */
.paper[data-compact="1"] .paper-inner    { font-size: 14px; line-height: 1.48; }
.paper[data-compact="1"] .paper-title    { font-size: 21px; }
.paper[data-compact="1"] .section        { margin-top: 5mm; }
.paper[data-compact="1"] .section-title  { font-size: 17px; }
.paper[data-compact="1"] .grid-item,
.paper[data-compact="1"] .sentence-item  { font-size: 14px; }
.paper[data-compact="1"] .answer-line    { height: 6.5mm; }

.paper[data-compact="2"] .paper-inner    { font-size: 13.5px; line-height: 1.42; }
.paper[data-compact="2"] .paper-title    { font-size: 20px; }
.paper[data-compact="2"] .paper-subtitle,
.paper[data-compact="2"] .paper-meta     { font-size: 13px; }
.paper[data-compact="2"] .paper-header   { margin-bottom: 5.5mm; }
.paper[data-compact="2"] .section        { margin-top: 4.5mm; }
.paper[data-compact="2"] .section-title  { font-size: 16px; margin-bottom: 2.5mm; }
.paper[data-compact="2"] .grid-list      { gap: 2.2mm 5mm; }
.paper[data-compact="2"] .grid-item,
.paper[data-compact="2"] .sentence-item  { font-size: 13.5px; }
.paper[data-compact="2"] .sentence-list  { gap: 3mm; }
.paper[data-compact="2"] .answer-line    { height: 6mm; }

.paper[data-compact="3"] .paper-inner    { font-size: 13px; line-height: 1.36; }
.paper[data-compact="3"] .paper-title    { font-size: 19px; }
.paper[data-compact="3"] .paper-subtitle,
.paper[data-compact="3"] .paper-meta     { font-size: 12px; }
.paper[data-compact="3"] .paper-header   { margin-bottom: 5mm; }
.paper[data-compact="3"] .section        { margin-top: 4mm; }
.paper[data-compact="3"] .section-title  { font-size: 15px; margin-bottom: 2mm; }
.paper[data-compact="3"] .grid-list      { gap: 2mm 4mm; }
.paper[data-compact="3"] .grid-item,
.paper[data-compact="3"] .sentence-item  { font-size: 13px; }
.paper[data-compact="3"] .sentence-list  { gap: 2.5mm; }
.paper[data-compact="3"] .answer-line    { height: 5.5mm; }

.paper[data-compact="4"] .paper-inner    { font-size: 12.5px; line-height: 1.32; }
.paper[data-compact="4"] .paper-title    { font-size: 18px; }
.paper[data-compact="4"] .paper-subtitle,
.paper[data-compact="4"] .paper-meta     { font-size: 11.5px; }
.paper[data-compact="4"] .paper-header   { margin-bottom: 4mm; }
.paper[data-compact="4"] .section        { margin-top: 3.5mm; }
.paper[data-compact="4"] .section-title  { font-size: 14px; margin-bottom: 1.8mm; }
.paper[data-compact="4"] .grid-list      { gap: 1.7mm 3.5mm; }
.paper[data-compact="4"] .grid-item,
.paper[data-compact="4"] .sentence-item  { font-size: 12.5px; }
.paper[data-compact="4"] .sentence-list  { gap: 2mm; }
.paper[data-compact="4"] .answer-line    { height: 5mm; }

.paper[data-compact="5"] .paper-inner    { font-size: 12px; line-height: 1.26; }
.paper[data-compact="5"] .paper-title    { font-size: 17px; }
.paper[data-compact="5"] .paper-subtitle,
.paper[data-compact="5"] .paper-meta     { font-size: 11px; }
.paper[data-compact="5"] .paper-header   { margin-bottom: 3.5mm; }
.paper[data-compact="5"] .section        { margin-top: 3mm; }
.paper[data-compact="5"] .section-title  { font-size: 13px; margin-bottom: 1.5mm; }
.paper[data-compact="5"] .grid-list      { gap: 1.5mm 3mm; }
.paper[data-compact="5"] .grid-item,
.paper[data-compact="5"] .sentence-item  { font-size: 12px; }
.paper[data-compact="5"] .sentence-list  { gap: 1.6mm; }
.paper[data-compact="5"] .answer-line    { height: 4.5mm; }

.paper[data-compact="6"] .paper-inner    { font-size: 11.5px; line-height: 1.22; }
.paper[data-compact="6"] .paper-title    { font-size: 16px; }
.paper[data-compact="6"] .paper-subtitle,
.paper[data-compact="6"] .paper-meta     { font-size: 10.5px; }
.paper[data-compact="6"] .paper-header   { margin-bottom: 3mm; }
.paper[data-compact="6"] .section        { margin-top: 2.6mm; }
.paper[data-compact="6"] .section-title  { font-size: 12.5px; margin-bottom: 1.2mm; }
.paper[data-compact="6"] .grid-list      { gap: 1.2mm 2.8mm; }
.paper[data-compact="6"] .grid-item,
.paper[data-compact="6"] .sentence-item  { font-size: 11.5px; }
.paper[data-compact="6"] .sentence-list  { gap: 1.4mm; }
.paper[data-compact="6"] .answer-line    { height: 4mm; }

.paper[data-compact="7"] .paper-inner,
.paper[data-compact="8"] .paper-inner    { font-size: 11px; line-height: 1.18; }
.paper[data-compact="7"] .paper-title,
.paper[data-compact="8"] .paper-title    { font-size: 15px; }
.paper[data-compact="7"] .paper-subtitle,
.paper[data-compact="7"] .paper-meta,
.paper[data-compact="8"] .paper-subtitle,
.paper[data-compact="8"] .paper-meta     { font-size: 10px; }
.paper[data-compact="7"] .section,
.paper[data-compact="8"] .section        { margin-top: 2.2mm; }
.paper[data-compact="7"] .section-title,
.paper[data-compact="8"] .section-title  { font-size: 12px; margin-bottom: 1mm; }
.paper[data-compact="7"] .grid-item,
.paper[data-compact="7"] .sentence-item,
.paper[data-compact="8"] .grid-item,
.paper[data-compact="8"] .sentence-item  { font-size: 11px; }
.paper[data-compact="7"] .answer-line,
.paper[data-compact="8"] .answer-line    { height: 3.6mm; }

/* ============================================================
   States (empty / loading / error)
   ============================================================ */
.empty-state, .loading-state, .error-state {
  padding: 40px 20px;
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text-sub);
  text-align: center;
  font-size: 14px;
  line-height: 1.7;
}
.loading-state { color: var(--primary); border-color: #C7D2FE; background: #F8FAFF; }
.error-state   { color: var(--danger);  border-color: #FECACA; background: #FFF5F5; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 980px) {
  .public-form-row { grid-template-columns: 1fr; }
  .paper { width: 100%; height: auto; min-height: auto; }
  .paper-inner { height: auto; }
  .public-header { align-items: stretch; padding: 0; }
  .admin-entry { position: static; align-self: flex-end; margin-top: 12px; transform: none; }
  .public-action-row { flex-direction: column; }
  .public-action-row button { width: 100%; }
}

/* ============================================================
   Print
   ============================================================ */
@media print {
  @page { size: A4 portrait; margin: 0; }
  body { background: #fff; }
  .app { max-width: none; padding: 0; }
  .controls, .public-status, .link-btn { display: none !important; }
  .paper-wrap { display: block; }
  .paper {
    width: 210mm;
    height: 297mm;
    box-shadow: none;
    border-radius: 0;
    padding: var(--page-padding);
    border: none;
  }
}