/* =========================================
   STYLE.CSS - COMPACT & REFACTORED
   ========================================= */

/* --- 1. Variables & General Styles --- */
:root {
    --primary-color: #0056b3;
    --secondary-color: #007bff;
    --success-color: #28a745;
    --danger-color: #d9534f;
    --light-gray: #f8f9fa;
    --background-color: #f4f4f9;
    --dark-text: #333;
    --light-text: #6c757d;
    --border-color: #dee2e6;
    --card-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    --border-radius: 8px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    background-color: var(--background-color);
    color: var(--dark-text);
}

main {
    padding: 2rem;
    max-width: 1100px;
    margin: 0 auto;
}
main.main--full-width {
    max-width: none;
    padding: 0;
}

/* --- 2. Header & Footer --- */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.logo {
    height: 50px;
}

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

nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    margin-left: 10px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

nav a:hover {
    background-color: #004494;
}

.hamburger, .nav-close-btn {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
    color: white;
}
.hamburger { font-size: 1.8rem; }
.nav-close-btn { position: absolute; top: 1rem; right: 1.5rem; font-size: 2.5rem; line-height: 1; }

footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 1rem;
    margin-top: 40px;
}

.social-links {
    margin-top: 1rem;
}
.social-links p {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}
.social-links a {
    color: white;
    font-size: 1.5rem;
    margin: 0 10px;
    transition: color 0.3s ease-in-out;
}
.social-links a:hover {
    color: #e2e6ea;
}

/* --- 3. Re-usable Components --- */
.hero {
    text-align: center;
    padding: 4rem 1rem;
    background-color: #fff;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    box-shadow: var(--card-shadow);
}

.btn-primary, .btn-secondary {
    color: white;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s, transform 0.2s;
    display: inline-block;
    margin: 0.5rem;
    border: none;
    cursor: pointer;
}
.btn-primary { background-color: var(--secondary-color); }
.btn-primary:hover { background-color: var(--primary-color); transform: translateY(-2px); }
.btn-secondary { background-color: var(--light-text); }
.btn-secondary:hover { background-color: var(--dark-text); transform: translateY(-2px); }

.cards {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    margin-top: 2rem;
    gap: 1.5rem;
}

.card {
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    flex-basis: 30%;
    border-radius: var(--border-radius);
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    transition: box-shadow 0.3s, transform 0.3s;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--card-shadow); }

.login-form, .signup-form {
    max-width: 400px;
    margin: 2rem auto;
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    background-color: #fff;
    box-shadow: var(--card-shadow);
}
.login-form input, .signup-form input {
    width: 100%;
    padding: 0.75rem;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    box-sizing: border-box;
}
.login-form button, .signup-form button {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}
.login-form button:hover, .signup-form button:hover {
    background-color: var(--primary-color);
}

.flashes {
    list-style: none;
    padding: 0;
    margin: 1rem auto;
    max-width: 600px;
    text-align: center;
}
.flashes li {
    color: #a94442;
    background-color: #f2dede;
    border: 1px solid #ebccd1;
    padding: 1rem;
    border-radius: var(--border-radius);
}

/* --- 4. Course Details Page --- */
.course-page-container { max-width: 960px; margin: 2rem auto; padding: 0 1rem; }
.course-header { background-color: var(--light-gray); border-radius: var(--border-radius); padding: 2.5rem 2rem; text-align: center; margin-bottom: 2.5rem; border: 1px solid var(--border-color); }
.course-header h1 { font-size: 2.5rem; font-weight: 700; margin-bottom: 1rem; color: var(--primary-color); }
.course-meta { display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem; margin-top: 1.5rem; }
.meta-item { background-color: #fff; padding: 0.5rem 1rem; border-radius: 50px; font-size: 0.9rem; border: 1px solid var(--border-color); box-shadow: 0 2px 5px rgba(0,0,0,0.05); }
.meta-item strong { color: var(--primary-color); margin-right: 0.3rem; }
.course-section { background-color: #fff; padding: 2rem; margin-bottom: 2.5rem; border-radius: var(--border-radius); box-shadow: var(--card-shadow); }
.course-section h2 { font-size: 1.8rem; color: var(--primary-color); margin-bottom: 1.5rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--secondary-color); display: inline-block; }
.learning-list { list-style: none; padding-left: 0; }
.learning-list li { padding-left: 2rem; position: relative; margin-bottom: 0.8rem; font-size: 1.05rem; }
.learning-list li::before { content: '✔'; position: absolute; left: 0; top: 0; color: var(--success-color); font-size: 1.2rem; font-weight: bold; }

.instructor-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.instructor-card { text-align: center; background-color: var(--light-gray); padding: 2rem; border-radius: var(--border-radius); border: 1px solid var(--border-color); transition: transform 0.3s ease, box-shadow 0.3s ease; }
.instructor-card:hover { transform: translateY(-5px); box-shadow: 0 8px 20px rgba(0,0,0,0.12); }
.instructor-card img { width: 120px; height: 120px; border-radius: 50%; object-fit: cover; border: 4px solid #fff; box-shadow: 0 0 10px rgba(0,0,0,0.1); margin-bottom: 1rem; }
.instructor-card h3 { font-size: 1.4rem; margin-bottom: 0.5rem; color: var(--primary-color); }
.instructor-card p { font-size: 0.95rem; line-height: 1.7; color: var(--light-text); text-align: left; }

/* --- 5. Accordion (Used in Course Details & Player) --- */
.accordion-item { border: 1px solid var(--border-color); border-radius: var(--border-radius); margin-bottom: 0.5rem; overflow: hidden; }
.accordion-header { background-color: var(--light-gray); cursor: pointer; padding: 1rem 1.5rem; border: none; text-align: left; font-size: 1.1rem; font-weight: 600; transition: background-color 0.3s ease; display: flex; justify-content: space-between; align-items: center; width: 100%; }
.accordion-header:hover, .accordion-header.active { background-color: #e2e6ea; }
.accordion-header::after { content: '+'; font-size: 1.5rem; color: var(--secondary-color); font-weight: bold; transition: transform 0.3s ease; }
.accordion-header.active::after { content: "−"; }
.accordion-content { padding: 0 1.5rem; background-color: white; max-height: 0; overflow: hidden; transition: max-height 0.3s ease-out; }
.accordion-content ul { list-style-type: disc; padding: 1rem 0 1.5rem 1.5rem; }
.accordion-content li { margin-bottom: 0.5rem; color: var(--light-text); }

/* --- 6. Course Player Page --- */
.player-container { display: grid; grid-template-columns: 3fr 1.2fr; gap: 2rem; max-width: 1400px; margin: 2rem auto; padding: 0 1rem; }
.video-main { background-color: #fff; padding: 2rem; border-radius: var(--border-radius); box-shadow: var(--card-shadow); }
#currentVideoTitle { font-size: 1.8rem; font-weight: 600; color: var(--primary-color); margin: 0 0 1.5rem 0; }
.video-player-wrapper { position: relative; padding-top: 56.25%; background-color: #000; border-radius: var(--border-radius); overflow: hidden; }
#videoPlayer { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none; }
.video-description { margin-top: 1.5rem; color: var(--light-text); line-height: 1.6; }

.video-playlist { background-color: var(--light-gray); border-radius: var(--border-radius); padding: 1.5rem; height: fit-content; border: 1px solid var(--border-color); }
.video-playlist h2 { margin-top: 0; font-size: 1.5rem; border-bottom: 2px solid var(--border-color); padding-bottom: 0.8rem; margin-bottom: 1rem; }
.video-playlist .accordion-item { border: none; border-bottom: 1px solid var(--border-color); border-radius: 0; margin-bottom: 0; }
.video-playlist .accordion-item:last-child { border-bottom: none; }
.video-playlist .accordion-header { background-color: transparent; padding: 1rem 0.5rem; }
.video-playlist .accordion-header:hover { background-color: #e9ecef; }
.video-playlist .accordion-content { padding: 0; }
.playlist-items { list-style: none; padding: 0; margin: 0; }
.playlist-item { display: flex; align-items: center; padding: 0.8rem 1rem; cursor: pointer; border-top: 1px solid #e9ecef; transition: background-color 0.2s ease; }
.playlist-item:hover { background-color: #e2e6ea; }
.playlist-item.active { background-color: var(--secondary-color); color: white; font-weight: 500; }
.completion-status { width: 18px; height: 18px; border: 2px solid var(--light-text); border-radius: 50%; margin-right: 1rem; display: flex; align-items: center; justify-content: center; flex-shrink: 0; transition: all 0.3s ease; }
.playlist-item.completed .completion-status { background-color: var(--success-color); border-color: var(--success-color); }
.playlist-item.completed .completion-status::before { content: '✔'; color: white; font-size: 12px; font-weight: bold; }
.playlist-item.completed .video-title { text-decoration: line-through; opacity: 0.7; }

/* --- 7. Responsive Design --- */
@media (max-width: 992px) {
    .player-container { grid-template-columns: 1fr; }
    .video-main { margin-bottom: 2rem; }
}

@media (max-width: 768px) {
    .hamburger, .nav-close-btn { display: block; }
    nav { position: fixed; top: 0; right: -100%; width: 250px; height: 100vh; background-color: var(--primary-color); flex-direction: column; align-items: flex-start; padding-top: 5rem; box-shadow: -5px 0 15px rgba(0,0,0,0.2); transition: right 0.35s ease-in-out; z-index: 1000; }
    nav.active { right: 0; }
    nav a { margin: 1rem 1.5rem; width: calc(100% - 3rem); text-align: left; }
    main { padding: 1rem; }
    .cards { flex-direction: column; align-items: center; }
    .card { width: 90%; flex-basis: auto; }
    .course-header h1 { font-size: 2rem; }
    .course-section { padding: 1.5rem; }
    .instructor-grid { grid-template-columns: 1fr; }
}


.accordion-content {
    display: block !important;
    max-height: 500px !important; /* A large enough value to show content */
    overflow: visible !important;
}