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

:root {
  --primary-color: #2563eb;
  --secondary-color: #1e40af;
  --accent-color: #3b82f6;
  --text-dark: #1e293b;
  --text-light: #64748b;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --success-color: #10b981;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--bg-white);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  z-index: 1000;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-lg);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 20px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.nav-brand i {
  font-size: 2rem;
}

.nav-logo {
  width: 28px;
  height: 28px;
  max-width: 100%;
  max-height: 36px;
  object-fit: contain;
  border-radius: 6px;
  display: inline-block;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
  padding: 120px 0 80px;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text h1 {
  font-size: 3rem;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  color: var(--text-dark);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-light);
  margin-bottom: 2rem;
  line-height: 1.8;
}

.download-buttons {
  display: flex;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background-color: var(--secondary-color);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: var(--text-dark);
  color: white;
}

.btn-secondary:hover {
  background-color: #334155;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-light:hover {
  background-color: var(--bg-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Android download highlight button */
.btn-android {
  background-color: #25D366;
  color: white;
  box-shadow: 0 8px 30px rgba(37, 211, 102, 0.25);
}
.btn-android:hover {
  background-color: #1EB957;
  transform: translateY(-3px);
  box-shadow: 0 10px 36px rgba(30, 185, 87, 0.28);
}

.btn-dark {
  background-color: rgb(106, 101, 101);
  color: var(--primary-color);
}

.btn-dark:hover {
  background-color: var(--bg-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.hero-stats {
  display: flex;
  gap: 3rem;
}

.stat {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.stat i {
  font-size: 2.5rem;
  color: var(--primary-color);
}

.stat strong {
  display: block;
  font-size: 1.5rem;
  color: var(--text-dark);
}

.stat span {
  display: block;
  font-size: 0.875rem;
  color: var(--text-light);
}

/* Phone Mockup */
.hero-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.phone-mockup {
  width: 300px;
  height: 600px;
  background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
  border-radius: 40px;
  padding: 15px;
  box-shadow: var(--shadow-lg);
  position: relative;
}

.phone-mockup::before {
  content: '';
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 25px;
  background-color: #0f172a;
  border-radius: 0 0 20px 20px;
}

.phone-screen {
  width: 100%;
  height: 100%;
  background-color: white;
  border-radius: 30px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.snellen-preview {
  text-align: center;
  padding: 20px;
}

.snellen-line {
  font-weight: 700;
  letter-spacing: 8px;
  margin: 15px 0;
  color: var(--text-dark);
}

.snellen-line:nth-child(1) { font-size: 3rem; }
.snellen-line:nth-child(2) { font-size: 2.5rem; }
.snellen-line:nth-child(3) { font-size: 2rem; }
.snellen-line:nth-child(4) { font-size: 1.5rem; }
.snellen-line:nth-child(5) { font-size: 1.2rem; }

/* Features Section */
.features {
  padding: 80px 0;
  background-color: var(--bg-white);
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 3rem;
  color: var(--primary-color);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.feature-card {
  background-color: var(--bg-white);
  padding: 2rem;
  border-radius: 16px;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}

.feature-icon i {
  font-size: 2rem;
  color: white;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.feature-card p {
  color: var(--text-light);
  line-height: 1.8;
}

/* About Section */
.about {
  padding: 80px 0;
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
}

.about .about-content {
  max-width: 900px;
  margin: 0 auto;
}

.about h2 {
  font-size: 2.8rem;
  color: var(--text-dark);
  margin-bottom: 0.75rem;
  text-align: center;
}

.about-tagline {
  font-size: 1.4rem;
  color: var(--primary-color);
  font-weight: 600;
  text-align: center;
  margin-bottom: 2.5rem;
}

.about-intro {
  margin-bottom: 3rem;
  background-color: rgba(255, 255, 255, 0.8);
  padding: 2rem;
  border-radius: 12px;
  border-left: 4px solid var(--primary-color);
}

.about-intro p {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-dark);
  margin-bottom: 1.5rem;
}

.about-intro p:last-child {
  margin-bottom: 0;
}

.about-section-group {
  margin-bottom: 3rem;
  background-color: white;
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.about-section-group h3 {
  font-size: 1.8rem;
  color: var(--primary-color);
  margin-bottom: 1.5rem;
}

.about-section-group p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-dark);
  margin-bottom: 1.5rem;
}

.about-section-group p:last-of-type {
  margin-bottom: 0;
}

.features-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 0;
}

.feature-item {
  padding: 1.25rem;
  background-color: #f8fafc;
  border-radius: 8px;
  border-left: 3px solid var(--accent-color);
}

.feature-item h4 {
  font-size: 1rem;
  color: var(--primary-color);
  margin-bottom: 0.5rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.feature-item h4 i {
  font-size: 1.1rem;
  color: var(--accent-color);
  min-width: 1.2rem;
  text-align: center;
}

.feature-item p {
  font-size: 0.9rem;
  color: var(--text-dark);
  margin-bottom: 0;
  line-height: 1.6;
}

.impact-list {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
}

.impact-list li {
  font-size: 1rem;
  color: var(--text-dark);
  margin-bottom: 0.75rem;
  padding-left: 2rem;
  position: relative;
  line-height: 1.6;
}

.impact-list li::before {
  content: "→";
  position: absolute;
  left: 0.5rem;
  color: var(--primary-color);
  font-weight: bold;
  font-size: 1.1rem;
}

.impact-section {
  display: flex;
  flex-direction: column;
}

.impact-columns {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.impact-columns::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background-color: #f3f4f6;
  border-radius: 0 8px 8px 0;
  z-index: 0;
}

.impact-left,
.impact-right {
  position: relative;
  z-index: 1;
}

.impact-left {
  padding-right: 1rem;
}

.impact-left p strong {
  color: var(--primary-color);
  font-weight: 700;
  font-size: 1.05rem;
}

.impact-right {
  padding: 1.25rem;
  background: transparent;
  border-radius: 8px;
  color: var(--text-dark);
}

.impact-right p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-dark);
}

.about-section-group.mission {
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border: 2px solid var(--primary-color);
}

.about-section-group.mission h3 {
  color: var(--secondary-color);
}

.about-section-group.mission p {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-dark);
}

/* Responsive Design for About Section */
@media (max-width: 768px) {
  .about {
    padding: 60px 0;
  }

  .about h2 {
    font-size: 2rem;
  }

  .about-tagline {
    font-size: 1.1rem;
  }

  .about-intro {
    padding: 1.5rem;
  }

  .about-section-group {
    padding: 1.75rem;
  }

  .about-section-group h3 {
    font-size: 1.4rem;
  }

  .features-list {
    grid-template-columns: 1fr;
  }

  .impact-list li {
    padding-left: 1.75rem;
  }
}

@media (max-width: 640px) {
  .about {
    padding: 40px 0;
  }

  .about h2 {
    font-size: 1.6rem;
  }

  .about-tagline {
    font-size: 1rem;
    margin-bottom: 1.5rem;
  }

  .about-intro {
    padding: 1.25rem;
  }

  .about-intro p {
    font-size: 0.95rem;
  }

  .about-section-group {
    padding: 1.5rem;
    margin-bottom: 2rem;
  }

  .about-section-group h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
  }

  .about-section-group p {
    font-size: 0.95rem;
  }

  .feature-item {
    padding: 1.25rem;
  }

  .feature-item h4 {
    font-size: 1rem;
  }

  .impact-list li {
    font-size: 0.95rem;
    padding-left: 1.5rem;
  }
}

/* CTA Section */
.cta {
  padding: 80px 0;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  text-align: center;
  color: white;
}

.cta h2 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.cta p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  opacity: 0.95;
}

/* Contact Section */
.contact {
  padding: 80px 0;
  background-color: var(--bg-white);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info h3 {
  font-size: 1.75rem;
  margin-bottom: 2rem;
  color: var(--text-dark);
}

.contact-item {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.contact-item i {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin-top: 5px;
}

.contact-item strong {
  display: block;
  color: var(--text-dark);
  margin-bottom: 0.25rem;
}

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

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

.social-links a {
  width: 50px;
  height: 50px;
  background-color: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-decoration: none;
  transition: all 0.3s ease;
}

.social-links a:hover {
  background-color: var(--secondary-color);
  transform: translateY(-3px);
}

.contact-form {
  background-color: var(--bg-light);
  padding: 2rem;
  border-radius: 16px;
}

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

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

.form-group textarea {
  resize: vertical;
}

/* Footer */
.footer {
  background-color: var(--text-dark);
  color: white;
  padding: 60px 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-brand i {
  font-size: 2rem;
  color: var(--accent-color);
}

.footer-brand span {
  font-size: 1.5rem;
  font-weight: 700;
}

.footer-brand p {
  color: #94a3b8;
}

.footer-links h4 {
  margin-bottom: 1rem;
  color: white;
}

.footer-links a {
  display: block;
  color: #94a3b8;
  text-decoration: none;
  margin-bottom: 0.75rem;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid #334155;
  color: #94a3b8;
}

/* WhatsApp Float Button */
.whatsapp-float {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 60px;
  height: 60px;
  background-color: #25d366;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 2rem;
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
  z-index: 999;
  transition: all 0.3s ease;
  text-decoration: none;
}

.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(37, 211, 102, 0.6);
}

.whatsapp-float i {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

/* Responsive Design */
@media (max-width: 968px) {
  .nav-links {
    display: none;
  }

  .hero-content,
  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-text h1 {
    font-size: 2.5rem;
  }

  .phone-mockup {
    width: 250px;
    height: 500px;
  }

  .hero-image {
    order: -1;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-stats {
    flex-direction: column;
    gap: 1.5rem;
  }
}

@media (max-width: 640px) {
  .hero-text h1 {
    font-size: 2rem;
  }

  .section-title {
    font-size: 2rem;
  }

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

  .btn {
    width: 100%;
    justify-content: center;
  }

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

  .whatsapp-float {
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    bottom: 20px;
    right: 20px;
  }
}

/* Privacy Policy Page */
.privacy-policy {
  padding: 120px 0 80px;
  background-color: var(--bg-white);
  min-height: 100vh;
  margin-top: 60px;
}

.privacy-policy h1 {
  font-size: 2.5rem;
  color: var(--text-dark);
  margin-bottom: 1rem;
  text-align: center;
}

.privacy-policy .last-updated {
  text-align: center;
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 3rem;
}

.policy-section {
  margin-bottom: 3rem;
  background-color: var(--bg-light);
  padding: 2rem;
  border-radius: 12px;
  line-height: 1.8;
}

.policy-section h2 {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
}

.policy-section p {
  color: var(--text-dark);
  margin-bottom: 1rem;
  font-size: 1rem;
}

.policy-section ul {
  margin-left: 1.5rem;
  color: var(--text-dark);
}

.policy-section li {
  margin-bottom: 0.75rem;
  font-size: 1rem;
}

.contact-details {
  background-color: white;
  padding: 1.5rem;
  border-left: 4px solid var(--primary-color);
  border-radius: 8px;
}

.contact-details p {
  margin: 0.5rem 0;
}

/* Founder Profile Section */
.founder-profile {
  padding: 80px 0;
  background-color: #1e3a8a;
  color: white;
}

.founder-profile .section-title {
  color: white;
  margin-bottom: 3rem;
}

.founder-content {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 50px;
  align-items: center;
}

.founder-image {
  display: flex;
  justify-content: center;
  align-items: center;
}

.founder-img {
  width: 100%;
  max-width: 350px;
  height: auto;
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
  object-fit: cover;
}

.founder-info h3 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: white;
}

.founder-title {
  font-size: 1.1rem;
  color: #3b82f6;
  font-weight: 600;
  margin-bottom: 1.5rem;
}

.founder-bio {
  font-size: 1rem;
  line-height: 1.8;
  color: #e0e7ff;
  margin-bottom: 1.5rem;
}

.founder-info h4 {
  font-size: 1.3rem;
  color: white;
  margin-bottom: 1rem;
  margin-top: 2rem;
}

.founder-positions {
  list-style: none;
  margin: 0;
  padding: 0;
}

.founder-positions li {
  font-size: 0.95rem;
  line-height: 1.8;
  color: #e0e7ff;
  margin-bottom: 0.75rem;
  padding-left: 1.5rem;
  position: relative;
}

.founder-positions li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #3b82f6;
  font-weight: bold;
}

.founder-positions strong {
  color: white;
}

/* Responsive Design for Founder Section */
@media (max-width: 1024px) {
  .founder-content {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 40px;
  }

  .founder-img {
    max-width: 300px;
  }

  .founder-info h3 {
    font-size: 1.7rem;
  }
}

@media (max-width: 768px) {
  .founder-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .founder-image {
    order: -1;
  }

  .founder-img {
    max-width: 280px;
  }

  .founder-info h3 {
    font-size: 1.5rem;
  }

  .founder-info h4 {
    font-size: 1.1rem;
  }

  .founder-bio {
    font-size: 0.95rem;
  }

  .founder-positions li {
    font-size: 0.9rem;
  }
}

@media (max-width: 640px) {
  .founder-profile {
    padding: 60px 0;
  }

  .founder-info h3 {
    font-size: 1.3rem;
  }

  .founder-info h4 {
    font-size: 1rem;
  }

  .founder-bio {
    font-size: 0.9rem;
  }

  .founder-positions li {
    font-size: 0.85rem;
  }

  .founder-img {
    max-width: 240px;
  }
}

/* Responsive Design for About Section */
@media (max-width: 1200px) {
  .features-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .feature-item {
    padding: 1rem;
  }

  .feature-item h4 {
    font-size: 0.95rem;
  }

  .feature-item p {
    font-size: 0.85rem;
  }
}

@media (max-width: 768px) {
  .about {
    padding: 60px 0;
  }

  .about h2 {
    font-size: 2rem;
  }

  .about-tagline {
    font-size: 1.1rem;
  }

  .about-intro {
    padding: 1.5rem;
  }

  .about-section-group {
    padding: 1.75rem;
  }

  .about-section-group h3 {
    font-size: 1.4rem;
  }

  .features-list {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .impact-list li {
    padding-left: 1.75rem;
  }

  .impact-columns {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .impact-left {
    padding-right: 0;
  }

  .impact-right {
    padding-left: 0;
    border-left: none;
    border-top: none;
    padding: 1rem;
    background-color: #f3f4f6;
    border-radius: 8px;
    margin-top: 0.5rem;
  }

  .impact-columns::before {
    display: none;
  }
}

@media (max-width: 640px) {
  .about {
    padding: 40px 0;
  }

  .about h2 {
    font-size: 1.6rem;
  }

  .about-tagline {
    font-size: 1rem;
    margin-bottom: 1.5rem;
  }

  .about-intro {
    padding: 1.25rem;
  }

  .about-intro p {
    font-size: 0.95rem;
  }

  .about-section-group {
    padding: 1.5rem;
    margin-bottom: 2rem;
  }

  .about-section-group h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
  }

  .about-section-group p {
    font-size: 0.95rem;
  }

  .feature-item {
    padding: 1rem;
  }

  .feature-item h4 {
    font-size: 0.9rem;
  }

  .impact-list li {
    font-size: 0.95rem;
    padding-left: 1.5rem;
  }
}