/* --- CSS Variables and Global Styles --- */
:root {
    --primary-purple: #9b59b6;
    --primary-blue: #3498db;
    --secondary-dark: #2c3e50;
    --background-color: #f8f9fa;
    --card-background: #ffffff;
    --text-dark: #373e47;
    --text-light: #6a737d;
    --border-color: #e1e4e8;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.12);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-dark);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* --- Header & Navigation --- */
.header {
    background-color: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

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

.navbar-logo {
    font-family: 'Roboto Mono', monospace;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--secondary-dark);
}

.navbar-links {
    display: none;
    align-items: center;
    gap: 1.5rem;
}

.navbar-links a {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 500;
    padding: 0.5rem;
    border-radius: 4px;
    transition: color 0.3s;
}

.navbar-links a:hover {
    color: var(--text-dark);
}

.navbar-links .active {
    color: var(--text-dark);
    font-weight: 700;
    border-bottom: 2px solid var(--primary-purple);
}

.navbar-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn {
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.3s, color 0.3s;
    text-align: center;
    display: inline-block;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--primary-purple);
    color: white;
    border: 1px solid var(--primary-purple);
}

.btn-primary:hover {
    background-color: #8e44ad;
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-dark);
    border: 1px solid var(--text-dark);
}

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

.menu-toggle {
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* --- Main Content --- */
#main-content {
    min-height: 80vh;
    padding: 16px;
}

.page {
    padding: 2rem 0;
}

/* --- General Hero Section --- */
.language-hero {
    text-align: center;
    margin-bottom: 2rem;
    padding: 2rem 0;
}

.language-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.language-hero p {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto 2rem;
}

/* --- Course Grid (Used on Homepage and /courses/) --- */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

/* --- Master Course Card (on /courses/ page) --- */
.m-course-card {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    text-decoration: none;
    color: var(--text-dark);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    /* Ensures the image corners are rounded */
}

.m-course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1), 0 8px 24px rgba(0, 0, 0, 0.1);
}

.m-course-card-image {
    width: 100%;
    height: 180px;
    overflow: hidden;
}

.m-course-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.m-course-card-content {
    padding: 1.5rem;
}

.m-course-card-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.m-course-card-desc {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* --- Single Course Page --- */
.m-course-header {
    background-color: var(--card-background);
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.m-course-cover-image {
    max-height: 350px;
    width: 100%;
}

.m-course-cover-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.m-course-header-content {
    padding: 2rem;
}

.m-course-header-content h1 {
    font-size: 2.25rem;
    margin-bottom: 0.5rem;
}

.m-course-header-content p {
    font-size: 1.1rem;
    color: var(--text-light);
}

.m-course-body {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.m-course-main-content h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.m-course-lesson-list h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.m-lesson-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 1rem;
    text-decoration: none;
    color: var(--text-dark);
    transition: background-color 0.2s, border-color 0.2s;
}

.m-lesson-card:hover {
    background-color: #f8f9fa;
    border-color: #d1d5db;
}

.m-lesson-card-icon {
    font-size: 1.2rem;
    color: var(--primary-purple);
}

.m-lesson-card-content h4 {
    font-size: 1rem;
    font-weight: 500;
}

/* --- Single Lesson Page --- */
/*
==============================================
--- Single Lesson Page Styles ---
==============================================
*/

/*
==============================================
--- Single Lesson Page Styles ---
==============================================
*/






/* --- Footer --- */
.footer {
    background-color: var(--secondary-dark);
    color: white;
    padding: 2rem 0;
    text-align: center;
    margin-top: 2rem;
}

/* --- Media Queries --- */
@media (max-width: 768px) {
    .header {
        position: relative;
    }

    .page {
        padding: 0;
    }

    .navbar-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--card-background);
        border-top: 1px solid var(--border-color);
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
        padding: 1rem 0;
    }

    .navbar-links.open {
        display: flex;
    }

    .navbar-links a {
        padding: 1rem 1.5rem;
        color: var(--text-dark);
        border-bottom: 1px solid var(--border-color);
    }

    .navbar-links a:hover {
        background-color: var(--background-color);
    }

    .navbar-links .active {
        border-bottom: 2px solid var(--primary-purple);
    }

    .menu-toggle {
        display: block;
    }

    .navbar-right .btn {
        display: none;
    }

    .m-lesson-container {
        padding: 4px;
    }
}

@media (min-width: 769px) {
    .navbar-links {
        display: flex;
    }

    .menu-toggle {
        display: none;
    }
}

@media (min-width: 992px) {
    .m-course-body {
        grid-template-columns: 2fr 1fr;
    }
}