:root {
  --accent: #1E4FA0;
  --accent-2: #12876F;
  --accent-soft: #EEF3FF;
  --accent-soft-border: #9DB8E8;
  --text: #22284A;
  --muted: #5B6178;
  --danger: #B3261E;
  --danger-soft: #FDECEC;
  --ok-soft: #E9F7EF;
  --ok-border: #9FD8B8;
  --border: #E1E5F0;
  --bg: #F4F6FB;
  --card-bg: #FFFFFF;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Vazirmatn', Tahoma, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
}

.wrap {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 20px;
}

.topbar {
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  padding: 22px 0;
  margin-bottom: 24px;
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: 14px; }
.brand-badge { font-size: 34px; line-height: 1; }
.brand h1 { font-size: 20px; margin: 0 0 4px; }
.brand p { font-size: 13px; margin: 0; color: #DCE6FF; }

.btn {
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
  transition: transform .05s ease, opacity .15s ease;
}
.btn:active { transform: scale(0.98); }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { opacity: .92; }

.btn-ghost { background: rgba(255,255,255,.15); color: #fff; border: 1px solid rgba(255,255,255,.4); }
.btn-ghost:hover { background: rgba(255,255,255,.25); }

.btn-sm { padding: 6px 12px; font-size: 13px; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 18px;
  box-shadow: 0 1px 2px rgba(20, 30, 70, 0.04);
}

.section-title {
  font-size: 15px;
  margin: 0 0 14px;
  color: var(--accent);
}

.field-label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}

.field-block { margin-bottom: 18px; }
.field-block:last-child { margin-bottom: 0; }

.input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 14px;
  background: #fff;
  color: var(--text);
}
.input:focus { outline: 2px solid var(--accent-soft-border); border-color: var(--accent); }

.field-unit { font-size: 12.5px; color: var(--muted); margin-inline-start: 6px; }
.field-help { font-size: 12.5px; color: var(--muted); margin-top: 5px; }

.grid2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 620px) { .grid2 { grid-template-columns: 1fr; } }

.note-box, .ref-formula {
  margin-top: 14px;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
}
.note-box {
  background: var(--accent-soft);
  border: 1px solid var(--accent-soft-border);
  color: var(--accent);
}
.ref-formula {
  background: #F8F9FC;
  border: 1px solid var(--border);
  color: var(--muted);
}
.ref-formula pre {
  white-space: pre-wrap;
  font-family: 'Courier New', monospace;
  margin: 8px 0 0;
  color: var(--text);
  font-size: 12.5px;
  direction: ltr;
  text-align: left;
}

.checkbox-row { display: flex; align-items: center; gap: 8px; }
.checkbox-row input { width: 17px; height: 17px; }
.checkbox-row label { font-size: 13.5px; font-weight: 600; cursor: pointer; }

/* فهرست تیک‌خور ۳۱ استان */
.province-checklist { border: 1px solid var(--border); border-radius: 10px; padding: 14px; background: #FAFBFD; }
.select-all-row { margin-bottom: 10px; padding-bottom: 10px; border-bottom: 1px dashed var(--border); }
.select-all-row label { color: var(--accent); }
.province-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px 10px;
  margin-bottom: 4px;
}
@media (max-width: 620px) { .province-grid { grid-template-columns: repeat(2, 1fr); } }
.province-grid .checkbox-row label { font-weight: 400; font-size: 13px; }

.freq-section { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border); }
.freq-mode-row { margin-bottom: 10px; }
.shared-freq-block.disabled, .per-province-block.disabled { opacity: .45; pointer-events: none; }
.per-province-block { margin-top: 10px; }
.per-province-header { font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.per-province-row {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 8px;
  align-items: center;
  margin-bottom: 6px;
}
.per-province-row span { font-size: 13px; }

/* ردیف‌های استان (درصد مساحت) */
.rows-table { width: 100%; border-collapse: collapse; margin-bottom: 10px; }
.rows-table th { font-size: 12px; color: var(--muted); text-align: right; padding: 4px 6px; font-weight: 600; }
.rows-table td { padding: 4px 6px; }
.rows-table select, .rows-table input { width: 100%; padding: 6px 8px; font-size: 13px; border: 1px solid var(--border); border-radius: 6px; font-family: inherit; }
.row-remove-btn { background: var(--danger-soft); color: var(--danger); border: none; border-radius: 6px; padding: 6px 10px; cursor: pointer; font-size: 13px; }
.add-row-btn { background: var(--ok-soft); border: 1px solid var(--ok-border); color: #1F7A45; border-radius: 8px; padding: 8px 14px; cursor: pointer; font-size: 13px; }

.hint-ok { color: #1F7A45; background: var(--ok-soft); border: 1px solid var(--ok-border); border-radius: 8px; padding: 10px 14px; font-size: 13.5px; }

.calc-bar { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.error-text { color: var(--danger); font-size: 13.5px; }

.result-card { border-color: var(--accent-soft-border); }
.result-amounts { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 18px; }
@media (max-width: 620px) { .result-amounts { grid-template-columns: 1fr; } }
.amount-box {
  background: var(--accent-soft);
  border: 1px solid var(--accent-soft-border);
  border-radius: 10px;
  padding: 14px 16px;
  text-align: center;
}
.amount-label { display: block; font-size: 12.5px; color: var(--accent); margin-bottom: 4px; }
.amount-value { display: block; font-size: 20px; font-weight: 700; color: var(--accent); direction: ltr; }

.warnings-box {
  background: #FFF7E6;
  border: 1px solid #F0CE7E;
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 16px;
}
.warnings-box h3 { margin: 0 0 8px; font-size: 13.5px; color: #8A5B00; }
.warnings-box ul { margin: 0; padding-inline-start: 20px; font-size: 13px; color: #6B4700; }

.steps-box h3 { font-size: 13.5px; margin: 0 0 8px; color: var(--muted); }
.steps-box ol { margin: 0; padding-inline-start: 20px; font-size: 13px; color: var(--text); }
.steps-box li { margin-bottom: 4px; direction: ltr; text-align: right; unicode-bidi: plaintext; }

.footer-note {
  text-align: center;
  font-size: 12.5px;
  color: var(--muted);
  padding: 24px 20px 40px;
}

/* مودال راهنمای جامع */
.modal { position: fixed; inset: 0; z-index: 50; display: none; align-items: center; justify-content: center; }
.modal.open { display: flex; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(20,25,50,.5); }
.modal-panel {
  position: relative;
  background: #fff;
  border-radius: var(--radius);
  width: min(760px, 92vw);
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0,0,0,.25);
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
}
.modal-header h2 { font-size: 16px; margin: 0; }
.modal-body { padding: 20px; overflow-y: auto; font-size: 13.5px; }
.modal-body h3 { color: var(--accent); font-size: 14.5px; margin: 18px 0 6px; }
.modal-body h4 { font-size: 13.5px; margin: 12px 0 4px; }
.modal-body p { margin: 0 0 8px; }
.modal-body ul { margin: 0 0 8px; padding-inline-start: 20px; }
.modal-body .note-box { margin: 10px 0; }