/* ==========================================================================
   Components Styles
   ========================================================================== */

/* Navbar (Sticky Coursera Style) */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    padding: 15px 0;
    transition: box-shadow var(--transition-medium);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.nav-brand span {
    color: var(--color-secondary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-link {
    font-weight: 500;
    color: var(--color-dark);
}

.nav-link:hover {
    color: var(--color-secondary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.nav-actions-mobile {
    display: none;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--color-primary);
    cursor: pointer;
    margin-left: auto;
}

/* Mobile Responsiveness */
@media (max-width: 992px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-actions {
        display: none !important;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-white);
        flex-direction: column;
        gap: 0;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
        padding: 10px 20px 20px 20px;
        border-top: 1px solid rgba(0,0,0,0.05);
        z-index: 1000;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        width: 100%;
        text-align: left;
    }

    .nav-menu .nav-link {
        display: block;
        padding: 15px 10px;
        width: 100%;
        border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    
    .nav-menu li:nth-last-child(2) .nav-link {
        border-bottom: none;
    }

    /* Mobile actions inside the dropdown */
    .nav-actions-mobile {
        display: flex;
        flex-direction: column;
        gap: 10px;
        margin-top: 10px;
        padding-top: 20px;
        border-top: 1px solid rgba(0,0,0,0.05);
    }
    
    .nav-actions-mobile .nav-link {
        border-bottom: none;
        padding: 10px 0;
        text-align: center;
    }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: all var(--transition-medium);
    border: none;
}

.btn-primary {
    background-color: var(--color-secondary);
    color: var(--color-primary);
}

.btn-primary:hover {
    background-color: #1eb5d8;
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* Hero Section */
.hero {
    padding: 120px 20px;
    background-color: var(--color-primary);
    color: var(--color-white);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero h1 {
    font-size: 3.5rem;
    color: var(--color-white);
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero p {
    font-size: 1.2rem;
    color: var(--color-light);
    max-width: 700px;
    margin: 0 auto 30px auto;
}

@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .hero p { font-size: 1.1rem; }
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.card {
    background-color: var(--color-white);
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.03);
    transition: transform var(--transition-medium), box-shadow var(--transition-medium);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--color-secondary);
    margin-bottom: 20px;
}

/* Stats / Metrics */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-top: 40px;
}
.stat-item h3 {
    font-size: 3rem;
    color: var(--color-secondary);
    margin-bottom: 5px;
}

/* Footer */
.footer {
    background-color: var(--color-primary);
    color: var(--color-light);
    padding: 80px 20px 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-col h4 {
    color: var(--color-white);
    margin-bottom: 20px;
}

.footer-link {
    display: block;
    color: var(--color-muted);
    margin-bottom: 12px;
}

.footer-link:hover {
    color: var(--color-secondary);
    transform: translateX(5px);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--color-muted);
    color: var(--color-muted);
}

/* Scroll Animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.animate-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-100 { transition-delay: 100ms; }
.delay-200 { transition-delay: 200ms; }
.delay-300 { transition-delay: 300ms; }