:root {
  --main: #00796b;
  --secondary-main-color: #00655a;
  --secondary-main-hover-color: #00574c;
  --primary-font-family: "Crimson Pro";
  --secondary-font-family: "Nunito Sans";
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  outline: none;
}

body {
  background: var(--main);
}

.container {
  line-height: 1.6;
  color: white;
  z-index: 1;
}

h1 {
  font-family: var(--primary-font-family), sans-serif;
}

/* Navigation Styles */
.navbar {
  background: var(--main);
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0 auto;
  padding: 20px 75px;
  z-index: 10;
  position: fixed;
  width: 100%;
  top: 0;
}

.logo {
  font-size: 2rem;
  font-weight: 500;
  font-family: var(--primary-font-family), sans-serif;
}

.logo a {
  text-decoration: none;
  color: white;
}

.nav-links {
  display: flex;
  font-family: var(--secondary-font-family), serif;
  gap: 30px;
  font-size: 1.2rem;
  align-items: center;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.95);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

.nav-links a:hover {
  color: rgba(255, 255, 255, 0.8);
}

.nav-links .learn-words-btn {
  color: var(--main);
  transition: color 0.3s ease;
}
.nav-links .learn-words-btn:hover {
  color: var(--main);
}

#language-selector {
  font-size: 1rem;
  font-family: var(--secondary-font-family), serif;
  border: none;
  border-radius: 6px;
  background-color: var(--secondary-main-color);
  color: #ffffff;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'%3E%3Cpath fill='white' d='M2 0L0 2h4L2 0zM0 3l2 2 2-2H0z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
  background-size: 0.65rem auto;
  padding: 0.5rem 2rem 0.5rem 0.75rem;
}

#language-selector:focus {
  outline: none;
  border: none;
}

.learn-words-btn {
  background: white;
  font-family: var(--secondary-font-family), serif;
  padding: 10px 20px 10px;
  border-radius: 12px;
  color: var(--main);
  font-size: 1.2rem;
  font-weight: 600;
  border: none;
  transition-duration: 0.2s;
  text-decoration: none;
  display: flex;
  max-width: fit-content;
  gap: 7px;
}

.learn-words-btn:hover {
  background: #f6f6f6;
  color: var(--main);
  cursor: pointer;
}

/* Hero Section */
.hero-section {
  background: var(--main);
  min-height: 100vh;
  padding: 10px 20px;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--main);
}

.hero-content {
  max-width: 1200px;
  margin: 30px auto 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: center;
  padding: 90px 0 20px 0;
  position: relative;
  z-index: 1;
}

.hero-text h1 {
  font-size: 4rem;
  font-weight: bold;
  line-height: 4.6rem;
  margin-bottom: 10px;
}

.hero-text p {
  font-size: 2.4rem;
  font-family: var(--primary-font-family), sans-serif;
  margin-bottom: 80px;
}

.phone-mockup {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 25px;
  padding: 10px;
  max-width: 320px;
  margin: 0 auto;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.phone-mockup video {
  border-radius: 15px;
}

/* How It Works Section */
.how-it-works {
  background: var(--main);
  padding: 0 20px;
  text-align: center;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  font-family: var(--secondary-font-family), serif;
}

.how-it-works-title {
  font-size: 4rem;
  font-family: var(--primary-font-family), sans-serif;
  font-weight: bold;
}

.how-it-works-subtitle {
  font-size: 2rem;
  opacity: 0.9;
  margin-bottom: 80px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 60px;
  margin-bottom: 100px;
}

.feature {
  text-align: center;
}

.feature-icon {
  width: 100px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 30px;
  font-size: 6rem;
  backdrop-filter: blur(10px);
}

.feature h3 {
  font-size: 2rem;
  font-weight: bold;
  line-height: 2.75rem;
  margin-bottom: 10px;
}

.feature p {
  opacity: 0.9;
  font-weight: 300;
  font-size: 1.4rem;
}

/* Available Languages Section */
.available-languages {
  background: var(--main);
  padding: 0 20px;
  text-align: center;
}

.available-languages-title {
  font-size: 4rem;
  font-family: var(--primary-font-family), sans-serif;
  font-weight: bold;
}

.available-languages-subtitle {
  font-size: 2rem;
  opacity: 0.9;
  margin-bottom: 80px;
}

.available-languages .features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 80px;
  margin-bottom: 100px;
}

.available-languages .feature {
  background-color: var(--secondary-main-color);
  border-radius: 30px;
  padding: 1rem 0;
  color: white;
  text-decoration: none;
}

.available-languages .feature:hover {
  background-color: var(--secondary-main-hover-color);
}

.available-languages .language-name {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  font-size: 4rem;
  font-family: var(--primary-font-family), sans-serif;
}

.language-icon {
  margin-top: 10px;
}

/* Science Section */
.science-section {
  text-align: left;
  width: 100%;
  padding: 0 20px;
}

.science-title {
  font-size: 4rem;
  font-weight: bold;
  font-family: var(--primary-font-family), sans-serif;
}

.science-text {
  font-weight: 300;
  font-size: 1.4rem;
  opacity: 0.9;
  max-width: 800px;
}

.science-text a {
  color: white;
  transition-duration: 0.2s;
}

.forgetting-curve {
  padding: 20px 0;
  backdrop-filter: blur(10px);
  position: relative;
}

.chart-explanation {
  text-align: right;
  font-weight: 300;
  font-size: 1.4rem;
  opacity: 0.9;
  /*padding-right: 2rem;*/
  position: absolute;
  max-width: 600px;
  right: 0;
}

/* Policy Page Styles */
.policy {
  padding-top: 150px;
}

.policy h1 {
  font-size: 3rem;
}

.policy a {
  color: white;
}

.policy h2 {
  font-size: 1.9rem;
  padding-top: 30px;
}

.policy p,
.policy ul {
  font-size: 1.25rem;
  font-weight: 300;
}

.policy ul {
  padding-left: 30px;
  padding-bottom: 20px;
  padding-top: 10px;
}

/* Footer */
.footer {
  font-family: var(--secondary-font-family), serif;
  background: #000;
  margin-top: 200px;
  padding: 40px 20px 40px;
  text-align: center;
}

.footer-cta {
  font-size: 2.3rem;
  font-weight: bold;
  margin-bottom: 30px;
  font-family: var(--primary-font-family), sans-serif;
}

.footer .container {
  display: flex;
  justify-content: center;
  flex-direction: column;
}

.footer .container div {
  width: 100%;
  text-align: center;
  display: flex;
  justify-content: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 60px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.footer-links a {
  text-decoration: none;
  font-size: 1.1rem;
  font-weight: 300;
  line-height: 3rem;
  color: rgba(255, 255, 255, 0.78);
}

.footer-links span {
  font-size: 1.8rem;
}

.footer-links a:hover {
  color: white;
}

.copyright {
  font-size: 0.8rem;
  opacity: 0.5;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .navbar {
    text-align: center;
    display: flex;
    justify-content: center;
  }

  .hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }

  .hero-text {
    display: flex;
    flex-direction: column;
  }

  .hero-text div {
    display: flex;
    justify-content: center;
  }

  .hero-text h1 {
    font-size: 2.5rem;
    line-height: 3.2rem;
  }

  .hero-text p {
    font-size: 2rem;
  }

  .phone-mockup {
    box-shadow: none;
  }

  .how-it-works-title {
    font-size: 3rem;
    line-height: 2rem;
    padding-top: 40px;
  }

  .how-it-works-subtitle {
    font-size: 1.5rem;
    line-height: 2rem;
    padding-top: 20px;
    font-weight: 300;
  }

  .features-grid {
    gap: 40px;
  }

  /* Available Languages Section */
  .available-languages-title {
    font-size: 3rem;
    line-height: 3rem;
    padding-top: 40px;
  }

  .available-languages-subtitle {
    font-size: 1.5rem;
    line-height: 2rem;
    padding-top: 20px;
    font-weight: 300;
    margin-bottom: 50px;
  }

  .available-languages .features-grid {
    gap: 40px;
  }

  .available-languages .feature {
    padding: 0.5rem 0;
  }

  .available-languages .language-name {
    font-size: 3rem;
  }

  .nav-links {
    gap: 15px;
  }

  .nav-links a {
    display: none;
  }

  .science-title {
    line-height: 4rem;
    padding-bottom: 20px;
  }

  .forgetting-curve {
    display: none;
  }

  .chart-explanation {
    padding: 20px;
    text-align: left;
  }

  .footer-links {
    gap: 5px;
    flex-direction: column;
  }

  .footer-links span {
    display: none;
  }

  /* Policy page mobile styles */
  .policy {
    padding-left: 20px;
    padding-right: 20px;
  }

  .policy h1 {
    font-size: 2.5rem;
    line-height: 3rem;
  }
}