:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --background-light: #ffffff;
    --text-light: #212529;
    --background-dark: #212529;
    --text-dark: #ffffff;
    --transition-speed: 0.3s;
}

[data-bs-theme="dark"] {
    --primary-color: #0d6efd;
    --secondary-color: #adb5bd;
    --background-color: var(--background-dark);
    --text-color: var(--text-dark);
}

[data-bs-theme="light"] {
    --background-color: var(--background-light);
    --text-color: var(--text-light);
}

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

/* Navigation Styles */
.navbar {
    background-color: var(--background-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: background-color var(--transition-speed);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    color: var(--primary-color) !important;
    font-size: 1.5rem;
    transition: transform var(--transition-speed);
}

.navbar-brand:hover {
    transform: scale(1.05);
}

.nav-link {
    color: var(--text-color) !important;
    transition: all var(--transition-speed);
    position: relative;
    padding: 0.5rem 1rem;
    margin: 0 0.2rem;
}

.nav-link i {
    display: none; /* Hide icons by default in desktop */
}

/* Keep theme toggle icon visible */
#theme-toggle i {
    display: inline-block;
    font-size: 1.2rem;
    transition: all var(--transition-speed);
}

.nav-link:before {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    background-color: var(--primary-color);
    transition: all var(--transition-speed);
    transform: translateX(-50%);
}

.nav-link:hover:before {
    width: 100%;
}

.nav-link:hover {
    color: var(--primary-color) !important;
    transform: translateY(-2px);
}

.nav-link.active {
    color: var(--primary-color) !important;
    font-weight: 600;
}

.nav-link.active:before {
    width: 100%;
}

/* Navbar Toggle Animation */
.navbar-toggler {
    position: relative;
    border: none;
    padding: 0.25rem;
    outline: none !important;
    box-shadow: none !important;
    transition: all var(--transition-speed);
    display: none; /* Hide by default for desktop */
}

@media (max-width: 991.98px) {
    .navbar-toggler {
        display: block; /* Show only on mobile */
    }

    .navbar-toggler:hover {
        transform: scale(1.1);
    }

    .navbar-toggler:focus {
        box-shadow: none;
    }

    .navbar-toggler .navbar-toggler-icon {
        transition: opacity var(--transition-speed), transform var(--transition-speed);
    }

    .navbar-toggler .close-icon {
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%) scale(0);
        opacity: 0;
        font-size: 1.5rem;
        color: var(--text-color);
        transition: opacity var(--transition-speed), transform var(--transition-speed);
    }

    .navbar-toggler[aria-expanded="true"] .navbar-toggler-icon {
        transform: scale(0);
        opacity: 0;
    }

    .navbar-toggler[aria-expanded="true"] .close-icon {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
    .navbar-collapse {
        background-color: var(--background-color);
        padding: 1rem;
        border-radius: 8px;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
        margin-top: 1rem;
        transform-origin: top;
        transition: transform var(--transition-speed), opacity var(--transition-speed);
    }

    .navbar-collapse:not(.show) {
        display: block;
        transform: scaleY(0);
        opacity: 0;
        height: 0;
        padding: 0;
        margin: 0;
    }

    .navbar-collapse.show {
        transform: scaleY(1);
        opacity: 1;
    }

    .nav-link {
        padding: 0.75rem 1rem;
        margin: 0.2rem 0;
        border-radius: 4px;
        transform: translateX(-10px);
        opacity: 0;
        transition: all var(--transition-speed);
    }
    .nav-link i {
        display: inline-block; /* Show icons in mobile view */
    }
    .navbar-collapse.show .nav-link {
        transform: translateX(0);
        opacity: 1;
    }

    .nav-link:hover {
        background-color: rgba(var(--bs-primary-rgb), 0.1);
        transform: translateX(5px) !important;
    }

    .nav-link:before {
        display: none;
    }

    .nav-link.active {
        background-color: var(--primary-color);
        color: white !important;
    }

    /* Stagger animation for menu items */
    .navbar-nav .nav-item:nth-child(1) .nav-link { transition-delay: 0.1s; }
    .navbar-nav .nav-item:nth-child(2) .nav-link { transition-delay: 0.15s; }
    .navbar-nav .nav-item:nth-child(3) .nav-link { transition-delay: 0.2s; }
    .navbar-nav .nav-item:nth-child(4) .nav-link { transition-delay: 0.25s; }
    .navbar-nav .nav-item:nth-child(5) .nav-link { transition-delay: 0.3s; }
    .navbar-nav .nav-item:nth-child(6) .nav-link { transition-delay: 0.35s; }
    .navbar-nav .nav-item:nth-child(7) .nav-link { transition-delay: 0.4s; }
    .navbar-nav .nav-item:nth-child(8) .nav-link { transition-delay: 0.45s; }
}

/* Theme Toggle Button */
#theme-toggle {
    padding: 0.5rem;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-speed);
}

#theme-toggle:hover {
    background-color: rgba(var(--bs-primary-rgb), 0.1);
    transform: rotate(30deg);
}

#theme-toggle i {
    font-size: 1.2rem;
    transition: all var(--transition-speed);
}

/* Hero Slider */
.carousel {
    margin-top: 56px;
}

.carousel-item {
    height: 100vh;
}

.carousel-item img {
    object-fit: cover;
    height: 100%;
    filter: brightness(0.7);
}

.carousel-caption {
    bottom: 20%;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.carousel-caption h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

/* Cards */
.card {
    background-color: var(--background-color);
    border: 1px solid rgba(0,0,0,0.125);
    transition: transform var(--transition-speed);
}

.card:hover {
    transform: translateY(-5px);
}

.card-img-top {
    height: 200px;
    object-fit: cover;
}

/* Sections */
section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

/* Team */
.team-member {
    text-align: center;
    margin-bottom: 30px;
}

.team-member img {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 20px;
}

/* Gallery */
.gallery-item {
    margin-bottom: 30px;
}

.gallery-item img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 8px;
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

/* Footer */
.footer {
    background-color: var(--background-color);
    color: var(--text-color);
    padding: 50px 0;
    margin-top: 50px;
}

.social-links a {
    color: var(--text-color);
    margin-right: 15px;
    font-size: 1.5rem;
    transition: color var(--transition-speed);
}

.social-links a:hover {
    color: var(--primary-color);
}

/* Responsive */
@media (max-width: 768px) {
    .carousel-caption h1 {
        font-size: 2rem;
    }

    .carousel-item {
        height: 60vh;
    }

    section {
        padding: 40px 0;
    }
}

/* E-Learning Styles */
.course-content {
    background-color: var(--background-color);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.lesson {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.lesson.active {
    opacity: 1;
}

.lesson-content img {
    max-height: 400px;
    width: 100%;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

.key-points {
    background-color: rgba(var(--bs-primary-rgb), 0.1);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1.5rem;
}

.key-points ul {
    list-style-type: none;
    padding-left: 0;
}

.key-points ul li {
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.key-points ul li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.navigation-buttons {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(0,0,0,0.1);
}

.navigation-buttons button {
    min-width: 120px;
}

.navigation-buttons button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

#lessonCounter {
    font-weight: 500;
    color: var(--text-color);
}

/* Course Selection Styles */
.course-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
}

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

.course-card img {
    height: 200px;
    object-fit: cover;
}

/* Back to Courses Button */
.back-to-courses {
    margin-right: 1rem;
}

/* Breadcrumb Styles */
.breadcrumb {
    background-color: transparent;
    padding: 0.75rem 0;
    margin-bottom: 2rem;
}

.breadcrumb-item a {
    color: var(--primary-color);
    text-decoration: none;
}

.breadcrumb-item.active {
    color: var(--text-color);
}

/* Development Message Styles */
.development-message {
    background-color: var(--background-color);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin: 2rem 0;
}

.development-message .fa-tools {
    color: var(--primary-color);
    animation: rotate 3s linear infinite;
    margin-bottom: 1.5rem;
    display: inline-block;
}

.development-message h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.development-message ul {
    max-width: 400px;
    margin: 2rem auto;
    list-style: none;
    padding: 0;
}

.development-message ul li {
    margin: 1rem 0;
    font-size: 1.1rem;
    padding-left: 1.5rem;
    position: relative;
}

.development-message ul li:before {
    content: "✓";
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* Lesson Transition */
.lesson {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.lesson.active {
    opacity: 1;
}