:root {
  --primary-color: #4169E1;
  --accent-color: #00BFA6;
  --light-bg: #F4F4F4;
  --dark-text: #333333;
  --heading-font: 'Poppins', sans-serif;
  --body-font: 'Roboto', sans-serif;
  --max-width: 1100px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--body-font);
  color: var(--dark-text);
  background: var(--light-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==== COMMON STYLES ==== */
.container, .faq, .contact-info, .resource-section, .intro {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem;
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding: .5rem 0;
  box-shadow: 0 5px 15px var(--dark-text);
  border-radius: .5rem;
  background: var(--primary-color);
  color: #fff;
}

.brand {
  display: flex;
  align-items: center;
  gap: .5rem;
  text-decoration: none;
  color: inherit;
}

.site-title { font-family: var(--heading-font); font-weight: 700; }
.logo { border-radius: 6px; }

.main-nav { display: flex; align-items: center; }

.head {
  padding: 0 .5rem;
  text-decoration: none;
  font-size: 16px;
  color: var(--light-bg);
  margin: 0 20px;
}
.head:hover {
  border-bottom: .2rem solid var(--accent-color);
  color: var(--dark-text);
  background: var(--light-bg);
}

.nav-toggle {
  width: 40px;
  height: 40px;
  border-radius: 30%;
  background: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.nav-toggle:hover { background-color: var(--accent-color); }
.material-icons { font-size: 25px; color: var(--light-bg); }

/* Hero */
.hero {
  background: transparent;
  padding: 2rem 0;
  text-align: center;
}
.hero .btn { display: flex; justify-content: space-around; flex-wrap: wrap; }
.hero .btn1, .btn2 {
  background: var(--accent-color);
  color: #fff;
  padding: .6rem 1rem;
  border-radius: 6px;
  text-decoration: none;
  display: inline-block;
}

/* What you'll learn */
.what-you-learn { margin-top: 1.5rem; text-align: center; }
.topic-grid {
  display: grid;
  justify-content: center;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.learn-card {
  background-color: var(--light-bg);
  border-radius: .5rem;
  box-shadow: 0 2px 6px;
  padding: 15px 25px;
  transition: transform .2s ease, background-color .2s ease;
}
.learn-card:hover {
  transform: translateY(-5px);
  background-color: var(--accent-color);
}

.language-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px,1fr));
  background: #fff;
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid var(--dark-text);
  text-align: center;
}
.language-card h3 {
  font-family: var(--heading-font);
  color: var(--primary-color);
}

/* Cards & Buttons */
.card {
  background: #fff;
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid #e6e6e6;
}
.controls {
  display: flex;
  gap: .5rem;
  align-items: center;
  margin: 1rem 0;
  flex-wrap: wrap;
}
.btn {
  color: #fff;
  padding: .5rem .75rem;
  border-radius: 6px;
  border: none;
  cursor: pointer;
}

/* Forms */
.contact-intro { text-align: center; }
.ai-form {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.25rem;
  display: grid;
  justify-content: center;
  text-align: center;
  grid-template-columns: repeat(auto-fit, minmax(300px,3fr));
}
label { display: block; margin-bottom: .5rem; }
input, textarea, select {
  width: 90%;
  padding: .6rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  margin-top: .25rem;
}

/* Sections */
.topics-section, .resources-section { padding: 3rem 1rem; }
.topics-grid, .resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  max-width: 1100px;
  margin: 0 auto;
}
.topic-card, .resource-card {
  background: #fff;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.08);
  text-decoration: none;
  color: var(--dark-text);
  transition: transform .2s, box-shadow .2s;
}
.resource-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 15px rgba(0,0,0,0.12);
}
.topic-card h2 { color: var(--primary-color); margin-bottom: .5rem; }

a {
  text-decoration: none;
  color: var(--dark-text);
  font-weight: bold;
  border-radius: 12px;
  transition: transform .2s, box-shadow .2s;
}
.topic-card:hover,a:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 10px var(--accent-color);
}

.resource-section li { color: var(--dark-text); }

/* Footer */
.site-footer {
  background: #222;
  color: #fff;
  padding: 1rem 0;
  margin-top: 2rem;
  text-align: center;
}
.site-footer a { color: var(--primary-color); }

/* ==== MEDIA QUERIES ==== */
@media (min-width: 800px) {
  .topic-grid { grid-template-columns: repeat(3, 1fr); }
  #nav-toggle { display: none; }
  #main-nav { display: flex; box-shadow: none; }
}

@media (max-width: 799px) {
  #main-nav {
    display: none;
    flex-direction: column;
    gap: 1rem;
    background: var(--primary-color);
    padding: 1rem;
  }
  #main-nav.show {
    position: absolute;
    display: grid;
    top: 98px;
    right: 10px;
    border-radius: .5rem;
    box-shadow: 0 5px 15px var(--dark-text);
  }
  #nav-toggle { display: flex; }
}