:root {
  --primary-green: #4CC96B;
  --primary-blue: #0057B8;
  --dark-text: #333333;
  --light-text: #666666;
  --bg-light: #F7F9FC;
  --white: #FFFFFF;
  --border: #E2E8F0;
  --shadow: 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);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --header-height: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans', 'Noto Sans Bengali', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--dark-text);
  line-height: 1.6;
  background-color: var(--white);
}

img {
  max-width: 100%;
  height: auto;
}

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

a:hover {
  text-decoration: underline;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4rem 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.5rem;
  color: var(--dark-text);
}

.section-subtitle {
  text-align: center;
  color: var(--light-text);
  margin-bottom: 2.5rem;
  font-size: 1.1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: #004494;
  text-decoration: none;
}

.btn-secondary {
  background-color: var(--primary-green);
  color: var(--white);
}

.btn-secondary:hover {
  background-color: #3db85a;
  text-decoration: none;
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-blue);
  border: 2px solid var(--primary-blue);
}

.btn-outline:hover {
  background-color: var(--primary-blue);
  color: var(--white);
  text-decoration: none;
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

.btn-whatsapp {
  background-color: #25D366;
  color: var(--white);
}

.btn-whatsapp:hover {
  background-color: #1DA851;
  text-decoration: none;
}

/* Floating WhatsApp button */
.whatsapp-float {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 56px;
  height: 56px;
  background-color: #25D366;
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  transition: transform 0.2s;
}

.whatsapp-float:hover {
  transform: scale(1.1);
  text-decoration: none;
}

@media (max-width: 768px) {
  .whatsapp-float {
    width: 48px;
    height: 48px;
    font-size: 1.5rem;
    bottom: 1rem;
    right: 1rem;
  }
}

/* Header */
.header {
  position: sticky;
  top: 0;
  background-color: var(--white);
  box-shadow: var(--shadow);
  z-index: 1000;
  height: var(--header-height);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo img {
  height: 48px;
  width: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--dark-text);
  font-weight: 500;
  font-size: 0.95rem;
}

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

.nav-links a.active {
  color: var(--primary-blue);
}

.header-phone {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  color: var(--primary-blue);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 3px;
  background-color: var(--dark-text);
  margin: 5px 0;
  border-radius: 2px;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--bg-light) 0%, #E8F4FD 100%);
  padding: 5rem 0;
  min-height: calc(100vh - var(--header-height));
  max-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-content h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--dark-text);
}

.hero-content h1 span {
  color: var(--primary-green);
}

.hero-content p {
  font-size: 1.25rem;
  color: var(--light-text);
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero-image img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card-grid.two-column {
  grid-template-columns: repeat(2, 1fr);
}

@media (max-width: 768px) {
  .card-grid.two-column {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.card-icon {
  width: 56px;
  height: 56px;
  background: linear-gradient(135deg, var(--primary-green), var(--primary-blue));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--light-text);
}

/* Package Cards */
.package-card {
  text-align: center;
  position: relative;
  overflow: hidden;
}

.package-card.featured {
  border: 2px solid var(--primary-blue);
}

.package-badge {
  position: absolute;
  top: 0;
  right: 0;
  background-color: var(--primary-blue);
  color: var(--white);
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-bottom-left-radius: var(--radius);
}

.package-speed {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary-blue);
  margin-bottom: 0.25rem;
}

.package-speed span {
  font-size: 1rem;
  font-weight: 600;
}

.package-price {
  font-size: 2rem;
  font-weight: 700;
  color: var(--dark-text);
  margin-bottom: 1rem;
}

.package-price span {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--light-text);
}

.package-features {
  list-style: none;
  margin-bottom: 1.5rem;
}

.package-features li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--light-text);
}

.package-features li:last-child {
  border-bottom: none;
}

/* Forms */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--dark-text);
}

.form-group label .required {
  color: #DC2626;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px rgba(0, 87, 184, 0.1);
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.checkbox-group input[type="checkbox"] {
  margin-top: 0.25rem;
  width: 18px;
  height: 18px;
  accent-color: var(--primary-blue);
}

.checkbox-group label {
  margin-bottom: 0;
  font-weight: 400;
  font-size: 0.95rem;
  color: var(--light-text);
}

.form-error {
  color: #DC2626;
  font-size: 0.875rem;
  margin-top: 0.25rem;
  display: none;
}

.form-control.is-invalid {
  border-color: #DC2626;
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
}

.form-success {
  background-color: #D1FAE5;
  color: #065F46;
  padding: 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  display: none;
}

.form-loading {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.honeypot {
  position: absolute;
  left: -9999px;
}

/* Map */
.map-container {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  height: 400px;
  background-color: var(--bg-light);
}

.map-container iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

/* Contact strip */
.contact-strip {
  background-color: var(--primary-blue);
  color: var(--white);
  padding: 3rem 0;
}

.contact-strip-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.contact-strip-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact-strip-item h4 {
  font-size: 0.875rem;
  text-transform: uppercase;
  opacity: 0.8;
  margin-bottom: 0.25rem;
}

.contact-strip-item a {
  color: var(--white);
  font-size: 1.1rem;
  font-weight: 600;
}

/* Footer */
.footer {
  background-color: var(--dark-text);
  color: var(--white);
  padding: 3rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-logo img {
  height: 40px;
  margin-bottom: 1rem;
}

.footer h4 {
  font-size: 1rem;
  margin-bottom: 1rem;
  color: var(--primary-green);
}

.footer ul {
  list-style: none;
}

.footer ul li {
  margin-bottom: 0.5rem;
}

.footer a {
  color: #CBD5E1;
  font-size: 0.95rem;
}

.footer a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid #475569;
  padding-top: 1.5rem;
  text-align: center;
  color: #94A3B8;
  font-size: 0.875rem;
}

/* FAQ */
.faq-item {
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 0;
}

.faq-question {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--dark-text);
}

.faq-answer {
  color: var(--light-text);
}

/* Breadcrumb / Page header */
.page-header {
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-green));
  color: var(--white);
  padding: 4rem 0;
  text-align: center;
}

.page-header h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.page-header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* Reassurance */
.reassurance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.reassurance-item {
  text-align: center;
  padding: 1.5rem;
}

.reassurance-item .icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.reassurance-item h4 {
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.reassurance-item p {
  font-size: 0.9rem;
  color: var(--light-text);
}

/* Banner image */
.banner-image {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.banner-image img {
  width: 100%;
  display: block;
}

/* Responsive */
@media (max-width: 992px) {
  .hero {
    min-height: auto;
    max-height: none;
    padding: 3rem 0;
  }

  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-content h1 {
    font-size: 2.25rem;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-image {
    order: -1;
  }

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

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--white);
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow);
    gap: 0;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-links li {
    border-bottom: 1px solid var(--border);
  }

  .nav-links a {
    display: block;
    padding: 0.75rem 0;
  }

  .header-phone {
    display: none;
  }

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

  .section {
    padding: 3rem 0;
  }

  .section-title {
    font-size: 1.75rem;
  }

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

  .contact-strip-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-content h1 {
    font-size: 1.875rem;
  }

  .btn-large {
    width: 100%;
  }

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

/* Utility */
.text-center {
  text-align: center;
}

.mt-2 {
  margin-top: 1rem;
}

.mb-2 {
  margin-bottom: 1rem;
}

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