*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface2: #f8fafc;
  --border: #e2e8f0;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --danger: #ff3b30;
  --warning: #ff9500;
  --success: #34c759;
  --text: #1c1c1e;
  --text-secondary: #6e6e73;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.05);
  --radius: 14px;
  --radius-sm: 8px;
}

body {
  font-family: 'Heebo', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  direction: rtl;
  min-height: 100vh;
  padding: 88px 16px 48px;
}

html[dir="ltr"] body { direction: ltr; }

.container {
  max-width: 1000px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 32px;
  position: relative;
  padding-top: 8px;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
}

header p {
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}


.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}

@media (max-width: 680px) {
  .grid { grid-template-columns: 1fr; }
  header h1 { font-size: 1.5rem; }
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 5px;
}

.form-group input[type="number"],
.form-group select {
  width: 100%;
  padding: 9px 12px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  background: var(--surface2);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s;
  direction: ltr;
  text-align: right;
  appearance: none;
  -webkit-appearance: none;
}

[dir="ltr"] .form-group input[type="number"],
[dir="ltr"] .form-group select {
  text-align: left;
}

.form-group input[type="number"]:focus,
.form-group select:focus {
  border-color: var(--accent);
  background: var(--surface);
}

.form-group select { cursor: pointer; }

.direction-toggle {
  display: flex;
  gap: 8px;
}

.direction-toggle input[type="radio"] { display: none; }

.direction-toggle label {
  flex: 1;
  text-align: center;
  padding: 8px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: all 0.15s;
  margin-bottom: 0;
}

.direction-toggle input[value="Long"]:checked + label {
  background: #e8f4e8;
  border-color: var(--success);
  color: #1a7a32;
}

.direction-toggle input[value="Short"]:checked + label {
  background: #fde8e8;
  border-color: var(--danger);
  color: #a00;
}

.ratio-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.ratio-btns {
  display: flex;
  gap: 6px;
}

.ratio-btn {
  padding: 7px 10px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface2);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.ratio-btn:hover { border-color: var(--accent); color: var(--accent); }
.ratio-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

.ratio-row input[type="number"] {
  width: 80px;
  flex-shrink: 0;
}

.actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.btn {
  flex: 1;
  padding: 11px 16px;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  min-width: 100px;
}

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

.btn-secondary {
  background: var(--surface2);
  color: var(--text-secondary);
  border: 1.5px solid var(--border);
}
.btn-secondary:hover { background: var(--border); }

.btn-copy {
  background: var(--surface2);
  color: var(--text);
  border: 1.5px solid var(--border);
}
.btn-copy:hover { background: #e5e5ea; }

.btn-pdf {
  background: #f0f4ff;
  color: #1a3fa0;
  border: 1.5px solid #c0d0f0;
}
.btn-pdf:hover { background: #dde8ff; }

.product-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 16px;
}

.product-info-grid .info-row {
  display: flex;
  flex-direction: column;
}

.info-row .label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 2px;
}

.info-row .value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.results-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.result-row:last-child { border-bottom: none; }

.result-label {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.result-value {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
}

.result-value.positive { color: var(--success); }
.result-value.negative { color: var(--danger); }

.alert {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  margin-bottom: 16px;
  line-height: 1.5;
}

.alert p + p { margin-top: 4px; }

.alert-error {
  background: #fff0f0;
  border: 1px solid #ffcccc;
  color: #8b0000;
}

.alert-warning {
  background: #fff8e6;
  border: 1px solid #ffe5a0;
  color: #7a4f00;
}

.alert-info {
  background: #fff8e6;
  border: 1px solid #ffe5a0;
  color: #7a4f00;
  font-size: 0.82rem;
  margin-top: 10px;
}

.hidden { display: none !important; }

footer {
  margin-top: 40px;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  padding: 0 16px;
}

/* ── Print / PDF content styles (used by html2pdf and @media print) ── */

.print-only { display: none; }

.print-header { margin-bottom: 24px; padding-bottom: 12px; border-bottom: 2px solid #1c1c1e; }
.print-header h1 { font-size: 18px; font-weight: 700; color: #1c1c1e; }
.print-meta { font-size: 11px; color: #6e6e73; margin-top: 4px; }

.print-section { margin-bottom: 20px; }
.print-section h3 {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: #6e6e73;
  border-bottom: 1px solid #e5e5ea;
  padding-bottom: 5px;
  margin-bottom: 8px;
}

.print-row {
  display: flex;
  justify-content: space-between;
  padding: 5px 0;
  border-bottom: 1px solid #f2f2f7;
  font-size: 12px;
}
.print-label { color: #6e6e73; }
.print-value { font-weight: 600; color: #1c1c1e; }
.print-positive { color: #1a7a32; }
.print-negative { color: #a00; }

.print-disclaimer {
  margin-top: 32px;
  padding-top: 12px;
  border-top: 1px solid #e5e5ea;
  font-size: 9px;
  color: #aaa;
  line-height: 1.6;
}

@media print {
  * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .no-print { display: none !important; }
  .print-only { display: block; }
  body { background: #fff; padding: 24px 32px; }
  .container { max-width: 100%; }
}