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

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: #1f2937;
    overflow-x: hidden;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 0.2rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-decoration: none;
}
.nav-container a{
    text-decoration: none;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-logo {
    font-size: 2rem;
}

.nav-title {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #10b981, #8b5cf6);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.nav-link {
    text-decoration: none;
    color: black;
    font-weight: 1000;
    transition: color 0.3s ease;
}
#active{
    color: #10b981;
}
.nav-link:hover {
    color: #10b981;
}

.nav-btn {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.nav-btn:hover {
    transform: scale(1.05);
}

.discover-btn {
    background-color: #007BFF;
    color: white;
    font-size: 18px;
    font-weight: bold;
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

.discover-btn:hover {
    background-color: #0056b3;
    transform: scale(1.07);
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.25);
}

body {
    font-family: Arial, sans-serif;
    background: linear-gradient(to right, #eef2f3, #d9e4ec);
    margin: 0;
    padding: 40px 20px;
}

h1 {
    text-align: center;
    font-size: 32px;
    color: #222;
    margin-bottom: 30px;
}
.lesson-container{
    margin-top: 6rem;
}
.directory-container {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.directory-item {
    background: #ffffff;
    padding: 18px;
    text-align: center;
    border-radius: 10px;
    font-size: 20px;
    font-weight: bold;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}    

.directory-item a {
    text-decoration: none;
    color: #333;
    display: block;
}

.directory-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.15);
}

.directory-item:hover a {
    color: #007BFF;
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}
.btn {
    padding: 1rem 2rem;
    border-radius: 9999px;
    font-weight: 600;
    font-size: 1.125rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

body { font-family: 'Poppins', sans-serif; color: #1f2937; line-height: 1.7; margin: 0; padding: 0; }
header { background: linear-gradient(135deg, #10b981, #8b5cf6); color: white; padding: 4rem 2rem; text-align: center; }
.container { max-width: 900px; margin: 3rem auto; padding: 0 2rem; }
.section { margin-bottom: 3rem; }
.section h2 { font-size: 2rem; color: #10b981; margin-bottom: 1rem; }
.tts-block { display: flex; align-items: flex-start; margin-bottom: 1rem; }
.play-btn { background: #10b981; color: white; border: none; border-radius: 50%; width: 2rem; height: 2rem; cursor: pointer; margin-right: 1rem; flex-shrink: 0; }
.tts-text { flex: 1; }
.highlight { background: yellow; }
.practice { background: #f0fdf4; border-left: 5px solid #10b981; padding: 1rem 2rem; border-radius: 0.5rem; }
.practice h3 { margin-top: 0; }
.practice ul { padding-left: 1.5rem; }
.practice li { margin-bottom: 0.5rem; }