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

html, body { margin: 0; padding: 0; }

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f5f7fb;
  color: #1f2933;
}

.hidden { display: none !important; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

/* ===========================
   HEADER (green gradient)
   =========================== */
.header {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(5, 150, 105, 0.15);
}

/* Tailwind-like utilities used by header/footer (minimal) */
.max-w-7xl {
  max-width: 1120px;
  margin-left: auto;
  margin-right: auto;
}
.mx-auto { margin-left: auto; margin-right: auto; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.space-x-3 > *:not(:last-child) { margin-right: .75rem; }
.space-x-4 > *:not(:last-child) { margin-right: 1rem; }
.space-x-8 > *:not(:last-child) { margin-right: 2rem; }

.text-white { color: #fff; }
.text-xl { font-size: 1.25rem; }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }
.inline-block { display: inline-block; }
.text-gray-200 { color: #e5e7eb; }
.text-gray-400 { color: #cbd5e0; }
.leading-relaxed { line-height: 1.625; }

.hover\:text-gray-200:hover { color: #e5e7eb; }
.transition-all { transition: all .3s ease; }
.hover\:scale-110:hover { transform: scale(1.1); }

/* Desktop nav */
.nav-links { list-style: none; }
.main-nav a { text-decoration: none; }

/* ===== MORE DROPDOWN (FIXED: click-to-open, stable) ===== */
.dropdown { position: relative; }
.dropdown button {
  background: transparent;
  border: 0;
  color: #fff;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 10px;
}
.dropdown button:hover { background: rgba(255,255,255,0.10); }

.dropdown-content {
  display: none;
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  background: #fff;
  min-width: 230px;
  box-shadow: 0 12px 38px rgba(0,0,0,0.14);
  border-radius: 12px;
  overflow: hidden;
  z-index: 50;
  transform-origin: top right;
  animation: fadeInDown .18s ease;
}

/* shows when JS adds .open */
.dropdown.open .dropdown-content { display: block; }

/* small hover-safe buffer (even if you later re-enable hover) */
.dropdown-content::before{
  content:"";
  position:absolute;
  top:-10px; left:0; right:0;
  height:10px;
}

.dropdown-content a {
  color: #4a5568;
  padding: 12px 18px;
  text-decoration: none;
  display: block;
  transition: all .25s ease;
  font-size: 14px;
}
.dropdown-content a:hover {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  color: #fff;
  padding-left: 26px;
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Mobile menu button */
.mobile-menu-btn {
  background: none;
  border: none;
  color: white;
  font-size: 24px;
  cursor: pointer;
}

/* Mobile nav container with slide animation */
.mobile-nav {
  background: #065f46;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height .28s ease, opacity .28s ease;
}
.mobile-nav.open { max-height: 520px; opacity: 1; }

.mobile-nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 8px 24px 16px;
}
.mobile-nav a {
  display: block;
  color: #e5e7eb;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  font-size: 15px;
  text-decoration: none;
}
.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav a:hover { color: #ffffff; }

/* Responsive utilities */
@media (min-width: 768px) {
  .md\:flex { display: flex; }
  .md\:hidden { display: none; }
  .md\:grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ===========================
   MAIN LAYOUT
   =========================== */
.page-main { padding: 24px 0 48px; }

.main-grid {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(260px, 1fr);
  gap: 24px;
  align-items: flex-start;
}

/* Hero */
.hero { margin-bottom: 16px; }
.eyebrow {
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #6b7280;
  margin: 0 0 4px;
}
.hero h1 {
  font-size: 26px;
  margin: 0 0 8px;
  color: #111827;
}
.hero-subtitle {
  margin: 0 0 10px;
  color: #4b5563;
  font-size: 15px;
  max-width: 680px;
}

/* Cards */
.card,
.calculator-card {
  background: #ffffff;
  border-radius: 18px;
  padding: 18px 18px 20px;
  box-shadow: 0 14px 35px rgba(15, 23, 42, 0.08);
}
.calculator-card { border-top: 4px solid #4f46e5; }

.section-title {
  font-size: 18px;
  margin: 0 0 6px;
  color: #111827;
}
.section-subtitle {
  margin: 0 0 14px;
  font-size: 13px;
  color: #6b7280;
}

/* Form grid */
.form-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px 14px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: #374151;
}
.form-group--full { grid-column: 1 / -1; }

input[type="text"],
input[type="number"],
select,
textarea {
  border-radius: 10px;
  border: 1px solid #d1d5db;
  padding: 9px 10px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color .18s ease, box-shadow .18s ease;
  background: #ffffff;
}
input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: #4f46e5;
  box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.15);
}

.help-text {
  font-size: 11px;
  color: #6b7280;
  margin: 0;
}

/* Buttons */
.btn {
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  padding: 8px 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: transform .14s ease, box-shadow .14s ease, background .14s ease;
}
.btn-primary {
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
  color: #fff;
  box-shadow: 0 6px 18px rgba(79, 70, 229, 0.35);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(79, 70, 229, 0.45);
}
.btn-tertiary {
  background: #f9fafb;
  color: #4b5563;
  border: 1px solid #e5e7eb;
}
.btn-tertiary:hover { background: #f3f4f6; }

.form-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
}

/* Results */
.results-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 14px;
}
.result-card {
  border-radius: 16px;
  padding: 14px 14px 16px;
  color: #ffffff;
  position: relative;
  overflow: hidden;
}
.result-card::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.14;
  background: radial-gradient(circle at top left, #ffffff 0, transparent 60%);
}
.result-label { position: relative; margin: 0 0 6px; font-size: 13px; opacity: 0.95; }
.result-value { position: relative; margin: 0; font-size: 20px; font-weight: 800; }
.result-meta  { position: relative; margin: 6px 0 0; font-size: 11px; opacity: 0.95; }

.result-card--margin { background: linear-gradient(135deg, #2563eb, #7c3aed); }
.result-card--units  { background: linear-gradient(135deg, #059669, #16a34a); }
.result-card--rev    { background: linear-gradient(135deg, #0ea5e9, #6366f1); }

.notice {
  margin-top: 12px;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid #e5e7eb;
  background: #f9fafb;
  color: #4b5563;
  font-size: 13px;
}
.notice--error {
  border-color: rgba(220, 38, 38, 0.22);
  background: rgba(254, 242, 242, 0.75);
  color: #991b1b;
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.sidebar-card {
  background: #ffffff;
  border-radius: 18px;
  padding: 14px 14px 16px;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.08);
}
.sidebar-card h2 { font-size: 16px; margin: 0 0 8px; }
.sidebar-card ul { list-style: none; padding: 0; margin: 0; }
.sidebar-card li { margin-bottom: 6px; }
.sidebar-card a {
  text-decoration: none;
  font-size: 13px;
  color: #4b5563;
}
.sidebar-card a:hover { text-decoration: underline; }

/* SEO content */
.content-section { margin-top: 24px; }
.seo-article h2 { font-size: 20px; margin: 16px 0 6px; }
.seo-article p,
.seo-article ul,
.seo-article ol {
  font-size: 14px;
  line-height: 1.7;
  color: #4b5563;
  margin: 0 0 10px;
}
.seo-article ul, .seo-article ol { padding-left: 20px; }
.seo-article li { margin-bottom: 6px; }

.related-calculators {
  margin-top: 24px;
  padding: 16px 14px;
  border-radius: 16px;
  background: #f3f4ff;
  border-left: 4px solid #4f46e5;
}
.related-calculators h2 { font-size: 18px; margin: 0 0 8px; color: #111827; }
.related-calculators p { margin: 0 0 8px; font-size: 14px; color: #4b5563; }
.related-calculators ul { margin: 0; padding-left: 18px; }
.related-calculators li { margin-bottom: 4px; }
.related-calculators a { color: #4f46e5; text-decoration: none; }
.related-calculators a:hover { text-decoration: underline; }

/* FAQ */
.faq-section { margin-top: 26px; }
.faq-section h2 { font-size: 18px; margin: 0 0 10px; }
.faq-item { border-top: 1px solid #e5e7eb; padding: 10px 0; }
.faq-item h3 {
  margin: 4px 0;
  font-size: 15px;
  color: #111827;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item p {
  margin: 4px 0 2px;
  font-size: 14px;
  color: #4b5563;
  display: none;
}
.faq-item.open p { display: block; }

/* ===========================
   FOOTER (FIXED like ss1)
   =========================== */
.footer {
  background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
  color: white;
  padding: 60px 0 20px;
  margin-top: 40px;
}

.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.gap-12 { gap: 3rem; }

.footer-column h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 20px;
  color: #a0aec0;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.footer-column ul { list-style: none; padding: 0; margin: 0; }
.footer-column ul li { margin-bottom: 12px; }
.footer-column ul li a {
  color: #cbd5e0;
  text-decoration: none;
  transition: all 0.3s ease;
  display: inline-block;
}
.footer-column ul li a:hover { color: #667eea; transform: translateX(5px); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: 40px;
  padding-top: 30px;
  text-align: center;
  color: #a0aec0;
}

/* Responsive */
@media (max-width: 900px) {
  .main-grid { grid-template-columns: minmax(0, 1fr); }
  .sidebar { order: -1; }
  .form-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .results-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 768px) {
  .form-grid { grid-template-columns: minmax(0, 1fr); }
  .hero h1 { font-size: 22px; }
  .hero-subtitle { font-size: 14px; }
}

@media (max-width: 480px) {
  .card, .calculator-card { padding: 14px 12px 16px; }
  .sidebar { gap: 12px; }
}