:root {
  --primary-navy: #0F172A;
  --secondary-navy: #1E293B;
  --accent-blue: #2563EB;
  --accent-hover: #1D4ED8;
  --light-bg: #F8FAFC;
  --card-bg: #FFFFFF;
  --text-main: #334155;
  --text-muted: #64748B;
  --border-color: #E2E8F0;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: 'DM Sans', sans-serif;
  color: var(--text-main);
  background-color: var(--light-bg);
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Manrope', sans-serif;
  color: var(--primary-navy);
}

a {
  text-decoration: none;
  color: inherit;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

/* Header & Nav */
header {
  background: var(--primary-navy);
  color: #FFF;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-md);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 0;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: #FFF;
  letter-spacing: -0.5px;
}

.logo span {
  color: var(--accent-blue);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 1.5rem;
  align-items: center;
}

.nav-link {
  color: #CBD5E1;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: #FFF;
}

.hamburger {
  display: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: #FFF;
  border-radius: 2px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
  border: none;
}

.btn-primary {
  background: var(--accent-blue);
  color: #FFF;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: #FFF;
  border: 1px solid #CBD5E1;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-navy) 0%, var(--secondary-navy) 100%);
  color: #FFF;
  padding: 5rem 0;
  text-align: center;
}

.hero-content h1 {
  font-size: 3rem;
  color: #FFF;
  margin-bottom: 1rem;
  font-weight: 800;
}

.hero-content p {
  font-size: 1.25rem;
  color: #94A3B8;
  max-width: 700px;
  margin: 0 auto 2rem;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section-title {
  text-align: center;
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 3rem;
}

/* Grids & Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card h3 {
  margin-bottom: 1rem;
  font-size: 1.3rem;
}

.card ul {
  list-style: none;
  margin-bottom: 1.5rem;
}

.card ul li {
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

/* Calculators */
.calc-box {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  max-width: 800px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 1rem;
  font-family: inherit;
}

.calc-output {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
  text-align: center;
}

.calc-output-item span {
  display: block;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.calc-output-item strong {
  font-size: 1.5rem;
  color: var(--accent-blue);
}

.disclaimer-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 1.5rem;
}

/* Footer */
footer {
  background: var(--primary-navy);
  color: #94A3B8;
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  color: #FFF;
  margin-bottom: 1.2rem;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 0.6rem;
}

.footer-col a:hover {
  color: #FFF;
}

.footer-bottom {
  border-top: 1px solid var(--secondary-navy);
  padding-top: 1.5rem;
  text-align: center;
  font-size: 0.875rem;
}

/* Floating WhatsApp Button */
.whatsapp-float {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: #25d366;
  color: #FFF;
  border-radius: 50px;
  padding: 10px 20px;
  font-weight: bold;
  box-shadow: var(--shadow-md);
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Responsive */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav-menu {
    display: none;
    flex-direction: column;
    width: 100%;
    position: absolute;
    top: 65px;
    left: 0;
    background: var(--primary-navy);
    padding: 1.5rem 0;
  }
  .nav-menu.active { display: flex; }
  .hero-content h1 { font-size: 2.2rem; }
}