:root {
  --color-primary: #0052FF;
  --color-primary-dark: #0041CC;
  --color-primary-surface: #F0F5FF;
  --color-white: #FFFFFF;
  --color-charcoal: #121417;
  --color-slate: #4A5568;
  --color-border: #E2E8F0;
  --color-bg-subtle: #F8FAFC;
  --color-danger: #DC2626;
  --color-success: #16A34A;

  --font-bn: 'Hind Siliguri', 'SolaimanLipi', sans-serif;
  --font-en: 'Montserrat', -apple-system, sans-serif;

  --container-max: 1200px;
  --container-read: 780px;
  --space-unit: 8px;
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  font-family: var(--font-bn);
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--color-slate);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-bn);
  color: var(--color-charcoal);
  line-height: 1.35;
  font-weight: 700;
}

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

a:hover, a:focus-visible {
  color: var(--color-primary-dark);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 12px 20px;
  z-index: 9999;
  font-weight: 600;
  border-radius: 4px;
}
.skip-link:focus {
  top: 20px;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: calc(var(--space-unit) * 3);
  padding-right: calc(var(--space-unit) * 3);
}

.readable-container {
  max-width: var(--container-read);
}

/* Header & Navigation */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.site-branding .site-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-charcoal);
  display: block;
}

.site-branding .site-subtitle {
  font-size: 0.8125rem;
  color: var(--color-primary);
  display: block;
  letter-spacing: 0.02em;
}

.nav-menu {
  display: flex;
  gap: calc(var(--space-unit) * 3);
  list-style: none;
}

.nav-menu a {
  font-weight: 600;
  color: var(--color-charcoal);
  font-size: 0.975rem;
}

.nav-menu a:hover {
  color: var(--color-primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 0.975rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white) !important;
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-charcoal);
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: var(--color-primary-surface);
}

/* Hero Section */
.hero-section {
  padding: calc(var(--space-unit) * 8) 0;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-white);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: calc(var(--space-unit) * 6);
  align-items: center;
}

.hero-slogan-badge {
  display: inline-block;
  background-color: var(--color-primary-surface);
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.875rem;
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: calc(var(--space-unit) * 2);
}

.hero-title {
  font-size: 2.75rem;
  margin-bottom: calc(var(--space-unit) * 2);
  line-height: 1.2;
}

.hero-lead {
  font-size: 1.15rem;
  margin-bottom: calc(var(--space-unit) * 4);
  color: var(--color-slate);
}

.hero-actions {
  display: flex;
  gap: calc(var(--space-unit) * 2);
}

.hero-image-wrapper {
  position: relative;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-subtle);
  aspect-ratio: 4 / 4.5;
}

.hero-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Sections & Cards */
.section {
  padding: calc(var(--space-unit) * 9) 0;
}

.section-bg {
  background-color: var(--color-bg-subtle);
}

.section-header {
  margin-bottom: calc(var(--space-unit) * 5);
}

.section-title {
  font-size: 2rem;
  margin-bottom: calc(var(--space-unit));
}

.section-subtitle {
  color: var(--color-slate);
  font-size: 1.05rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: calc(var(--space-unit) * 3);
}

.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: calc(var(--space-unit) * 3);
  display: flex;
  flex-direction: column;
  transition: var(--transition);
}

.card:hover {
  border-color: var(--color-primary);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: calc(var(--space-unit) * 1.5);
}

.card-excerpt {
  margin-bottom: calc(var(--space-unit) * 2);
  flex-grow: 1;
}

/* Forms */
.form-group {
  margin-bottom: calc(var(--space-unit) * 2.5);
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: calc(var(--space-unit));
  color: var(--color-charcoal);
  font-size: 0.9375rem;
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-family: inherit;
  font-size: 1rem;
  color: var(--color-charcoal);
  background-color: var(--color-white);
}

.form-control:focus {
  border-color: var(--color-primary);
  outline: none;
}

.form-notice {
  padding: 12px 16px;
  margin-bottom: calc(var(--space-unit) * 2);
  border-radius: 4px;
  font-size: 0.95rem;
  display: none;
}
.form-notice.active { display: block; }
.form-notice.success { background-color: #DEF7EC; color: #03543F; }
.form-notice.error { background-color: #FDE8E8; color: #9B1C1C; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-white);
  padding: calc(var(--space-unit) * 6) 0;
  font-size: 0.9375rem;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-border);
  margin-top: calc(var(--space-unit) * 4);
  padding-top: calc(var(--space-unit) * 3);
  color: var(--color-slate);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
  .nav-menu {
    display: none;
  }
  .mobile-menu-toggle {
    display: block;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
  }
}

/* --- Additions: mobile toggle hidden on desktop, open-state for mobile menu --- */
.mobile-menu-toggle {
  display: none;
}

@media (max-width: 900px) {
  .site-nav.is-open {
    position: absolute;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: calc(var(--space-unit) * 2) calc(var(--space-unit) * 3);
  }
  .site-nav.is-open .nav-menu {
    display: flex;
    flex-direction: column;
    gap: calc(var(--space-unit) * 1.5);
  }
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-unit);
    text-align: center;
  }
  .hero-title {
    font-size: 2rem;
  }
}

/* Content typography & pagination */
.entry-content > * + * { margin-top: calc(var(--space-unit) * 2); }
.entry-content ul, .entry-content ol { padding-left: calc(var(--space-unit) * 3); }
.entry-content h3 { margin-top: calc(var(--space-unit) * 4); }
.pagination { display: flex; gap: var(--space-unit); justify-content: center; margin-top: calc(var(--space-unit) * 5); }
.pagination .page-numbers { padding: 8px 14px; border: 1px solid var(--color-border); border-radius: 4px; }
.pagination .page-numbers.current { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-white); }
.footer-links { list-style: none; }
.footer-title { margin-bottom: var(--space-unit); }