:root {
  --color-page: #e5e7eb;
  --color-bg: #ffffff;
  --color-text: #111111;
  --color-text-secondary: #6b7280;
  --color-border: #e5e7eb;
  --color-accent: #2563eb;
  --color-accent-alt: #22c55e;
  --radius-md: 16px;
  --shadow-card: 0 18px 40px rgba(15, 23, 42, 0.12);
  --max-width: 1080px;
}

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

html {
  font-size: 16px;
}

body {
  margin: 0;
  font-family: "Vazirmatn", system-ui, -apple-system, BlinkMacSystemFont,
    "SF Pro Text", "Segoe UI", Roboto, Tahoma, Arial, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.16), transparent 55%),
    radial-gradient(circle at top right, rgba(34, 197, 94, 0.13), transparent 55%),
    linear-gradient(to bottom, #e5e7eb 0%, #f3f4f6 100%);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.site-header {
  border-bottom: 1px solid rgba(148, 163, 184, 0.26);
  background: rgba(248, 250, 252, 0.9);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0.75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9rem;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 0.9rem;
  border: 2px solid var(--color-text);
  box-shadow: 4px 4px 0 rgba(15, 23, 42, 1);
  background: #ffffff;
  font-weight: 700;
  font-size: 0.9rem;
}

.brand-text {
  font-weight: 500;
  color: var(--color-text-secondary);
}

.lang-switch a {
  font-size: 0.85rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background-color: #f9fafb;
}

.hero {
  padding: 1.8rem 0 0.7rem;
  /* background is now on body to cover full page height */
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
  align-items: flex-start;
}

.page-title {
  font-size: 1.7rem;
  margin: 0 0 0.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.calculator-label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.7rem;
  border-radius: 999px;
  background: rgba(34, 197, 94, 0.12);
  color: #047857;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 0.55rem;
}

.calculator-label::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: #22c55e;
}

.calculator-label-en {
  justify-content: flex-start;
}

.lead {
  margin: 0 0 1.4rem;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.calculator-card {
  background: #f9fafb;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  box-shadow: var(--shadow-card);
  padding: 1.4rem 1.3rem;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.calculator-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 55px rgba(15, 23, 42, 0.18);
  border-color: rgba(15, 23, 42, 0.1);
}

.calculator-form {
  display: grid;
  gap: 1.1rem;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.field-group label {
  font-size: 0.9rem;
  font-weight: 500;
}

.field-hint {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

input[type="number"] {
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  padding: 0.55rem 0.9rem;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  background: #f9fafb;
}

input[type="number"]::placeholder {
  font-family: "Vazirmatn", system-ui, -apple-system, BlinkMacSystemFont,
    "SF Pro Text", "Segoe UI", Roboto, Tahoma, Arial, sans-serif;
}

input[type="number"]:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.16);
  background: #ffffff;
}

.result-card {
  margin-top: 0.6rem;
  padding: 0.9rem 0.9rem 1rem;
  border-radius: 1.1rem;
  border: 1.5px solid rgba(148, 163, 184, 0.85);
  background: #ffffff;
  box-shadow: 0 6px 14px rgba(15, 23, 42, 0.06);
}

.result-label {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.result-value {
  margin-top: 0.4rem;
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.result-note {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.error-message {
  margin: 0.4rem 0 0;
  font-size: 0.78rem;
  color: #b91c1c;
  min-height: 1em;
}

.content-section {
  padding: 1.8rem 0 2.7rem;
}

.content-section h2 {
  font-size: 1.2rem;
  margin-top: 1.5rem;
  margin-bottom: 0.6rem;
  font-weight: 600;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.content-section h2::after {
  content: "";
  height: 2px;
  width: 42px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-alt));
}

.content-section h3 {
  font-size: 1rem;
  margin-top: 1.2rem;
  margin-bottom: 0.4rem;
}

.content-section p {
  margin: 0.4rem 0 0.6rem;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--color-text);
}

.content-section ul {
  padding-inline-start: 1.1rem;
  margin: 0.2rem 0 0.6rem;
}

.content-section li {
  font-size: 0.9rem;
  line-height: 1.8;
}

details {
  border-radius: 0.9rem;
  border: 1px solid var(--color-border);
  padding: 0.6rem 0.8rem;
  margin-top: 0.4rem;
  background: #f9fafb;
}

summary {
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
}

summary::-webkit-details-marker {
  display: none;
}

details[open] {
  background: #eef2ff;
}

details p {
  margin-top: 0.35rem;
  font-size: 0.85rem;
}

blockquote {
  margin: 0.4rem 0 0.8rem;
  padding: 0.6rem 0.8rem;
  border-radius: 0.9rem;
  border: 1px solid var(--color-border);
  background: #f9fafb;
  font-size: 0.9rem;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 0.8rem 0 1.1rem;
  background: #f9fafb;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: flex-start;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.footer-link {
  font-size: 0.8rem;
}

.ad-slot {
  border-radius: 0.9rem;
  border: 1px dashed var(--color-border);
  background: #f9fafb;
}

.ad-top,
.ad-bottom {
  margin: 0.75rem auto;
  max-width: var(--max-width);
  padding: 0.6rem;
  min-height: 60px;
}

.ad-inline {
  margin: 1.1rem 0;
  padding: 0.6rem;
  min-height: 80px;
}

.ad-inline-secondary {
  background: #ecfdf3;
  border-color: rgba(22, 163, 74, 0.4);
}

.ad-faq-bottom {
  background: #eff6ff;
  border-color: rgba(37, 99, 235, 0.4);
}

.ad-benefits-bottom,
.ad-blog-top,
.ad-blog-bottom {
  background: #f9fafb;
}

.ad-left,
.ad-right {
  display: none;
}

.ad-footer {
  margin-top: 0.8rem;
  margin-bottom: 0.3rem;
  padding: 0.6rem;
  min-height: 70px;
}

.blog-cards-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: 0.8rem;
}

.blog-section-intro {
  margin-top: 0.6rem;
}

.blog-card {
  border-radius: 1rem;
  border: 1px solid var(--color-border);
  background: #ffffff;
  overflow: hidden;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.08);
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}

.blog-card a {
  display: flex;
  flex-direction: row;
  gap: 0.75rem;
  padding: 0.85rem;
  color: inherit;
}

.blog-card-image-wrap {
  flex: 0 0 92px;
  border-radius: 0.8rem;
  overflow: hidden;
  background: #e5e7eb;
}

.blog-card-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.blog-card-body {
  flex: 1;
  min-width: 0;
}

.blog-card-title {
  margin: 0 0 0.25rem;
  font-size: 0.95rem;
  font-weight: 600;
}

.blog-card-summary {
  margin: 0;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.blog-card-more {
  display: inline-block;
  margin-top: 0.4rem;
  font-size: 0.78rem;
  color: var(--color-accent);
  font-weight: 500;
}

.blog-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.16);
  border-color: rgba(37, 99, 235, 0.3);
}

.blog-empty {
  margin-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* English layout tweak */
.hero-inner-en {
  direction: ltr;
}

@media (min-width: 960px) {
  .hero {
    padding-top: 2.25rem;
  }

  .hero-inner {
    grid-template-columns: 220px minmax(0, 1fr) 220px;
    gap: 1.75rem;
  }

  .calculator-card {
    padding: 1.6rem 1.7rem;
    grid-column: 2;
  }

  .ad-left {
    grid-column: 1;
  }

  .ad-right {
    grid-column: 3;
  }

  .page-title {
    font-size: 1.9rem;
  }

  .lead {
    font-size: 1rem;
  }

  .footer-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .ad-left,
  .ad-right {
    display: block;
    position: sticky;
    top: 5.25rem;
    min-height: 400px;
  }

  .blog-cards-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}