/* Global layout */
html {
  scroll-behavior: smooth;
  height: 100%;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100%;
  height: 100%;
}

/* Header + nav */
.header {
  background: linear-gradient(135deg, #1f2933 0%, #111827 100%);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
}

.header-inner {
  position: relative;
}

/* Brand */
.brand {
  text-decoration: none;
}

.site-logo {
  height: 40px;
  width: auto;
  display: block;
}

.brand-text {
  color: #ffffff;
  font-weight: 800;
  font-size: 1.15rem;
}

/* Desktop nav links */
.nav-links {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav-link {
  color: #ffffff;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.25s ease;
  display: inline-block;
}

.nav-link:hover {
  color: #d1fae5;
  transform: translateY(-1px);
}

/* Desktop dropdown */
.dropdown {
  position: relative;
}

.dropdown-toggle {
  background: none;
  border: none;
  color: #ffffff;
  font-weight: 500;
  cursor: pointer;
  padding: 0;
  transition: color 0.25s ease;
}

.dropdown-toggle:hover {
  color: #d1fae5;
}

.dropdown-content {
  display: none;
  position: absolute;
  top: 120%;
  right: 0;
  background: #ffffff;
  min-width: 220px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.35);
  border-radius: 0.75rem;
  overflow: hidden;
  z-index: 1100;
}

.dropdown.open .dropdown-content {
  display: block;
}

.dropdown-content a {
  color: #4b5563;
  padding: 12px 20px;
  text-decoration: none;
  display: block;
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.dropdown-content a:hover {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #ffffff;
  padding-left: 26px;
}

/* Mobile hamburger + menu */
.mobile-menu-btn {
  display: none;
  background: none;
  border: 2px solid #10b981;
  border-radius: 999px;
  padding: 4px 10px;
  color: #ecfdf5;
  font-size: 1.3rem;
  cursor: pointer;
  transition: background 0.25s ease, transform 0.15s ease, border-color 0.25s ease;
}

.mobile-menu-btn:hover {
  background: #10b981;
  border-color: #6ee7b7;
  transform: translateY(-1px);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  background: #065f46;
  padding: 12px 18px 16px;
  gap: 4px;
  border-bottom: 3px solid #10b981;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  color: #ecfdf5;
  text-decoration: none;
  padding: 8px 6px;
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: background 0.2s ease, transform 0.15s ease;
}

.mobile-menu a:hover {
  background: rgba(16, 185, 129, 0.2);
  transform: translateX(2px);
}

/* Page header / hero */
.page-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #ffffff;
  padding: 80px 20px 90px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top left, rgba(255, 255, 255, 0.2), transparent 55%);
  opacity: 0.7;
}

.page-header h1 {
  position: relative;
  z-index: 1;
  font-size: 2.9rem;
  font-weight: 900;
  margin-bottom: 12px;
  text-shadow: 0 8px 25px rgba(15, 23, 42, 0.6);
}

.page-header p {
  position: relative;
  z-index: 1;
  font-size: 1.15rem;
  opacity: 0.96;
}

/* Simple animations */
@keyframes float {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-12px) rotate(3deg);
  }
}

.float-animation {
  animation: float 3s ease-in-out infinite;
}

/* Main calculator */
.calculator-container {
  max-width: 1400px;
  margin: -60px auto 60px;
  padding: 0 20px;
  position: relative;
  z-index: 10;
}

.calculator-card {
  background: #ffffff;
  border-radius: 24px;
  padding: 40px;
  box-shadow: 0 22px 60px rgba(15, 23, 42, 0.25);
  margin-bottom: 24px;
}

.card-title {
  font-size: 1.7rem;
  font-weight: 800;
  color: #4c1d95;
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Tabs */
.calc-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

.calc-tab {
  padding: 10px 20px;
  background: #f3f4ff;
  border: 2px solid #e5e7eb;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.22s ease;
  color: #374151;
  font-size: 0.9rem;
}

.calc-tab:hover {
  border-color: #667eea;
  transform: translateY(-1px);
}

.calc-tab.active {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #ffffff;
  border-color: #4f46e5;
}

/* Inputs */
.input-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 20px;
}

.input-group {
  background: linear-gradient(135deg, #f3f4ff 0%, #e9e4f0 100%);
  padding: 18px;
  border-radius: 14px;
  border: 2px solid #667eea;
  transition: all 0.22s ease;
}

.input-group:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(99, 102, 241, 0.25);
}

.input-label {
  font-weight: 700;
  color: #4c1d95;
  margin-bottom: 6px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.input-field,
.select-field {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 2px solid #667eea;
  font-size: 0.95rem;
  font-weight: 500;
  color: #111827;
  transition: all 0.2s ease;
  background: #ffffff;
}

.input-field:focus,
.select-field:focus {
  outline: none;
  border-color: #7c3aed;
  box-shadow: 0 0 0 3px rgba(129, 140, 248, 0.35);
  transform: scale(1.01);
}

/* Primary calculate button */
.calculate-btn {
  width: 100%;
  padding: 16px;
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #ffffff;
  border: none;
  border-radius: 14px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.22s ease;
  margin-top: 12px;
}

.calculate-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 30px rgba(16, 185, 129, 0.45);
}

/* Results */
.result-display {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 30px;
  border-radius: 20px;
  color: #ffffff;
  margin-bottom: 24px;
}

.result-value {
  font-size: 3.2rem;
  font-weight: 900;
  margin-bottom: 4px;
  text-align: center;
}

.result-label {
  font-size: 1.25rem;
  font-weight: 600;
  text-align: center;
  opacity: 0.97;
  margin-bottom: 18px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.stat-card {
  background: rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(8px);
  padding: 18px;
  border-radius: 14px;
  text-align: center;
  border: 2px solid rgba(255, 255, 255, 0.22);
  transition: all 0.22s ease;
}

.stat-card:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
}

.stat-title {
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 6px;
  opacity: 0.9;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 900;
}

.stat-value-small {
  font-size: 1rem;
  line-height: 1.4;
}

/* Info / Ads / Downloads */
.adsense-container {
  background: linear-gradient(135deg, #f3f4ff 0%, #e9e4f0 100%);
  border-radius: 16px;
  padding: 22px;
  margin: 24px 0;
  min-height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px dashed #a78bfa;
}

.adsense-placeholder {
  text-align: center;
  color: #4c1d95;
  font-size: 0.9rem;
}

.info-box {
  background: linear-gradient(135deg, #f3f4ff 0%, #e9e4f0 100%);
  padding: 18px;
  border-radius: 12px;
  border-left: 4px solid #7c3aed;
  margin-top: 18px;
}

.info-title {
  font-weight: 700;
  color: #4c1d95;
  margin-bottom: 6px;
  font-size: 0.95rem;
}

.info-text {
  color: #5b21b6;
  font-size: 0.9rem;
  line-height: 1.6;
}

.download-buttons {
  display: flex;
  gap: 12px;
  margin-top: 22px;
  flex-wrap: wrap;
}

.download-btn {
  flex: 1;
  min-width: 180px;
  padding: 12px 20px;
  background: linear-gradient(135deg, #6366f1 0%, #7c3aed 100%);
  color: #ffffff;
  border: none;
  border-radius: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.95rem;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

/* Calendar conversions */
.calendar-heading {
  font-size: 1.3rem;
  font-weight: 700;
  color: #4c1d95;
  margin: 26px 0 10px;
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
  margin-top: 8px;
}

.calendar-card {
  background: #ffffff;
  padding: 16px;
  border-radius: 12px;
  border: 2px solid #e5e7eb;
  transition: all 0.2s ease;
}

.calendar-card:hover {
  border-color: #6366f1;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.14);
  transform: translateY(-2px);
}

.calendar-name {
  font-weight: 700;
  color: #4c1d95;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.calendar-date {
  color: #4b5563;
  font-size: 0.9rem;
  font-weight: 500;
}

/* Blog / SEO content */
.blog-section {
  max-width: 900px;
  margin: 70px auto;
  padding: 0 20px;
}

.blog-content {
  background: #ffffff;
  border-radius: 24px;
  padding: 40px;
  box-shadow: 0 14px 36px rgba(15, 23, 42, 0.18);
  line-height: 1.75;
}

.blog-content h2 {
  font-size: 2.1rem;
  font-weight: 900;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.blog-content h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: #111827;
  margin-top: 32px;
  margin-bottom: 12px;
}

.blog-content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: #1f2933;
  margin-top: 16px;
  margin-bottom: 6px;
}

.blog-content p {
  color: #4b5563;
  font-size: 0.98rem;
  margin-bottom: 14px;
}

.blog-content ul {
  margin-left: 1.3rem;
  margin-bottom: 14px;
  color: #4b5563;
}

.blog-content li {
  margin-bottom: 6px;
}

.blog-content a {
  color: #2563eb;
  text-decoration: none;
  font-weight: 500;
}

.blog-content a:hover {
  text-decoration: underline;
}

.highlight-box {
  background: #f3f4ff;
  padding: 16px;
  border-radius: 14px;
  border-left: 4px solid #6366f1;
  margin: 20px 0;
  font-size: 0.94rem;
}

/* FAQ */
.faq-item {
  margin-top: 16px;
  padding-top: 10px;
  border-top: 1px solid #e5e7eb;
}

.faq-item h4 {
  font-size: 1rem;
  font-weight: 700;
  color: #111827;
  margin-bottom: 6px;
}

.faq-item p {
  font-size: 0.95rem;
  color: #4b5563;
}

/* Footer */
.footer {
  background: linear-gradient(135deg, #1f2937 0%, #030712 100%);
  color: #ffffff;
  padding: 50px 0 18px;
  margin-top: 80px;
}

.footer-column h3 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: #9ca3af;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.footer-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-column ul li {
  margin-bottom: 8px;
}

.footer-column ul li a {
  color: #e5e7eb;
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.2s ease;
  display: inline-block;
}

.footer-column ul li a:hover {
  color: #22c55e;
  transform: translateX(4px);
}

.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.35);
  margin-top: 30px;
  padding-top: 18px;
  text-align: center;
  color: #9ca3af;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .nav-links {
    display: none !important;
  }

  .mobile-menu-btn {
    display: block;
  }
}

@media (max-width: 768px) {
  /* Hide desktop nav on mobile */
  .nav-links {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .page-header {
    padding: 60px 18px 70px;
  }

  .page-header h1 {
    font-size: 2.1rem;
  }

  .page-header p {
    font-size: 1rem;
  }

  .calculator-card {
    padding: 24px 18px;
  }

  .input-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .result-value {
    font-size: 2.5rem;
  }

  .download-buttons {
    flex-direction: column;
  }

  .blog-content {
    padding: 26px 18px;
  }

  .blog-content h2 {
    font-size: 1.7rem;
  }

  .blog-content h3 {
    font-size: 1.15rem;
  }
}