/* Base Styles */
        :root { --primary-color: #5624d0; --secondary-color: #f5f5f7; --accent-color: #ff6b6b; --text-color: #1c1d1f; --text-light: #6a6f73; --white: #ffffff; --black: #000000; --shadow: 0 4px 12px rgba(0, 0, 0, 0.08); --transition: all 0.3s ease; }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; line-height: 1.6; color: var(--text-color); background-color: var(--white); overflow-x: hidden; }
        a { text-decoration: none; color: inherit; }
        ul { list-style: none; }
        img { max-width: 100%; height: auto; display: block; }
        .container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
        /* Button Styles */
        .btn { display: inline-block; padding: 12px 24px; border-radius: 4px; font-weight: 600; text-align: center; cursor: pointer; transition: var(--transition); border: none; }
        .btn-primary { background-color: var(--primary-color); color: var(--white); }
        .btn-primary:hover { background-color: #4a1fb8; }
        .btn-outline { background-color: transparent; border: 1px solid var(--primary-color); color: var(--primary-color); }
        .btn-outline:hover { background-color: var(--primary-color); color: var(--white); }
        /* Header & Navigation */
        header { background-color: var(--white); box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1); position: sticky; top: 0; z-index: 1000; transition: var(--transition); border-bottom: 1px solid rgba(0, 0, 0, 0.05); }
        header.scrolled { box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15); }
        .logo { display: flex; align-items: center; position: absolute; left: 0; height: 80px; transition: var(--transition); }
        .logo-img { height: 70px; width: auto; margin-right: 15px; transition: var(--transition); }
        .logo:hover .logo-img { transform: scale(1.05); }
        .logo-text { display: flex; flex-direction: column; line-height: 1.2; }
        .logo-main { font-family: 'Cinzel', serif; font-weight: 600; font-size: 1.2rem; color: var(--text-color); letter-spacing: 1px; }
        .logo-sub { font-family: 'Cinzel', serif; font-weight: 600; font-size: 1.2rem; color: var(--text-color); letter-spacing: 1px; }
        .navbar { display: flex; justify-content: center; align-items: center; padding: 0 10px; height: 80px; max-width: 1400px; margin: 0 auto; position: relative; }
        .nav-links { display: flex; align-items: center; gap: 0; margin: 0; padding: 0; }
        .nav-links li a { font-weight: 600; padding: 8px 12px; margin: 0 -2px; border-radius: 4px; font-size: 0.95rem; color: var(--text-color); position: relative; transition: var(--transition); }
        .nav-links li a:hover { color: var(--primary-color); background-color: rgba(86, 36, 208, 0.1); }
        .dropdown { position: relative; }
        .dropdown-btn { display: flex; align-items: center; gap: 6px; font-weight: 600; padding: 8px 12px; border-radius: 6px; transition: var(--transition); cursor: pointer; }
        .dropdown-icon { font-size: 0.9rem; transition: var(--transition); }
        .dropdown:hover .dropdown-btn { color: var(--primary-color); }
        .dropdown:hover .dropdown-icon { transform: rotate(180deg); }
        .dropdown-content { position: absolute; top: 100%; left: 0; background-color: var(--white); min-width: 220px; box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15); border-radius: 8px; padding: 10px 0; opacity: 0; visibility: hidden; transform: translateY(10px); transition: var(--transition); z-index: 100; border: 1px solid rgba(0, 0, 0, 0.05); }
        .dropdown:hover .dropdown-content { opacity: 1; visibility: visible; transform: translateY(0); }
        .dropdown-content a { display: block; padding: 10px 20px; color: var(--text-color); transition: var(--transition); font-size: 0.95rem; }
        .dropdown-content a:hover { background-color: var(--secondary-color); color: var(--primary-color); padding-left: 25px; }
        .nav-actions { display: flex; align-items: center; gap: 15px; position: absolute; right: 20px; }
        .login-btn { font-weight: 600; padding: 10px 22px; border-radius: 6px; border: 1px solid var(--primary-color); background-color: transparent; transition: var(--transition); color: var(--primary-color); }
        .login-btn:hover { background-color: rgba(86, 36, 208, 0.1); }
        .signup-btn { background-color: var(--primary-color); color: var(--white); padding: 12px 24px; border-radius: 6px; font-weight: 600; transition: var(--transition); box-shadow: 0 4px 12px rgba(86, 36, 208, 0.2); }
        .signup-btn:hover { background-color: #4a1fb8; transform: translateY(-2px); box-shadow: 0 6px 16px rgba(86, 36, 208, 0.3); }
        #logoutBtn { background-color: #ff4d4d; color: var(--white); border: none; padding: 10px 20px; border-radius: 6px; font-weight: 600; cursor: pointer; transition: var(--transition); }
        #logoutBtn:hover { background-color: #e60000; transform: translateY(-2px); }
        .mobile-nav-btn { background: none; border: none; font-size: 1.6rem; color: var(--text-color); cursor: pointer; display: none; padding: 10px; margin-left: 10px; transition: var(--transition); }
        .mobile-nav-btn:hover { color: var(--primary-color); }
        @media (max-width: 1200px) { .nav-links { gap: 10px; } .nav-links li a { padding: 10px 14px; font-size: 1rem; } }
        @media (max-width: 992px) { .nav-links { display: none; } .mobile-nav-btn { display: block; } .logo-img { height: 60px; } .logo-text { font-size: 1.6rem; } }
        @media (max-width: 768px) { .logo-text { display: none; } .logo-img { height: 55px; margin-right: 0; } .login-btn, .signup-btn { padding: 8px 16px; font-size: 0.9rem; } }
        @media (max-width: 576px) { .navbar { padding: 0 15px; } .logo-img { height: 50px; } .mobile-nav-btn { font-size: 1.4rem; } .nav-actions { gap: 10px; } }
        .auth-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background-color: rgba(0, 0, 0, 0.5); z-index: 1000; display: none; justify-content: center; align-items: center; }
        .auth-modal { background-color: var(--white); padding: 2rem; border-radius: 8px; width: 90%; max-width: 400px; box-shadow: var(--shadow); position: relative; }
        .close-auth { position: absolute; top: 15px; right: 15px; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--text-light); }
        .auth-tabs { display: flex; margin-bottom: 1.5rem; border-bottom: 1px solid #eee; }
        .auth-tab { padding: 0.75rem 1.5rem; cursor: pointer; border-bottom: 2px solid transparent; font-weight: 600; color: var(--text-light); transition: var(--transition); }
        .auth-tab.active { border-bottom: 2px solid var(--primary-color); color: var(--primary-color); }
        .auth-form { display: none; }
        .auth-form.active { display: block; }
        .auth-form input { width: 100%; padding: 12px; margin-bottom: 1rem; border: 1px solid #ddd; border-radius: 4px; font-size: 1rem; transition: var(--transition); }
        .auth-form input:focus { border-color: var(--primary-color); outline: none; box-shadow: 0 0 0 2px rgba(86, 36, 208, 0.2); }
        .auth-form button { width: 100%; padding: 12px; background-color: var(--primary-color); color: var(--white); border: none; border-radius: 4px; font-size: 1rem; font-weight: 600; cursor: pointer; margin-top: 0.5rem; transition: var(--transition); }
        .auth-form button:hover { background-color: #4a1fb8; }
        .auth-switch { text-align: center; margin-top: 1.5rem; color: var(--text-light); }
        .auth-switch a { color: var(--primary-color); font-weight: 600; cursor: pointer; }
        .login-required { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background-color: var(--white); padding: 2rem; border-radius: 8px; box-shadow: var(--shadow); z-index: 1001; display: none; text-align: center; max-width: 90%; width: 300px; }
        .login-required h3 { margin-bottom: 1rem; color: var(--primary-color); }
        .login-required p { margin-bottom: 1.5rem; color: var(--text-light); }
        .login-required button { padding: 10px 20px; background-color: var(--primary-color); color: var(--white); border: none; border-radius: 4px; font-weight: 600; cursor: pointer; transition: var(--transition); }
        .login-required button:hover { background-color: #4a1fb8; }
        #coursehub { padding: 60px 0; }
        #coursehub h1 { font-size: 2.5rem; margin-bottom: 30px; color: var(--primary-color); text-align: center; }
        .tab-nav { display: flex; gap: 10px; margin-bottom: 30px; padding-bottom: 10px; overflow-x: auto; scrollbar-width: thin; }
        .tab-nav::-webkit-scrollbar { height: 6px; }
        .tab-nav::-webkit-scrollbar-thumb { background-color: #888; border-radius: 4px; }
        .tab-btn { padding: 10px 20px; background: #f1f1f1; border: none; cursor: pointer; border-radius: 4px; font-weight: 500; white-space: nowrap; transition: var(--transition); }
        .tab-btn:hover { background: #ddd; }
        .tab-btn.active { background: var(--primary-color); color: var(--white); }
        .course-slider-container { position: relative; margin: 20px 0; border-radius: 8px; background-color: var(--secondary-color); padding: 10px 0; box-shadow: var(--shadow); }
        .course-slider-nav { display: none; position: absolute; top: 50%; width: 100%; transform: translateY(-50%); justify-content: space-between; pointer-events: none; z-index: 10; padding: 0 10px; }
        @media (min-width: 768px) { .course-slider-nav { display: flex; } }
        .slider-btn { background: rgba(255, 255, 255, 0.9); border: 1px solid #ddd; color: var(--primary-color); font-size: 1.5rem; padding: 10px 15px; border-radius: 50%; cursor: pointer; transition: var(--transition); pointer-events: all; box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1); flex-shrink: 0; opacity: 0.8; line-height: 1; }
        .slider-btn:hover { background: var(--primary-color); color: var(--white); opacity: 1; transform: scale(1.05); }
        .course-slider { display: flex; overflow-x: scroll; gap: 20px; padding: 20px 10px; scroll-snap-type: x mandatory; -webkit-overflow-scrolling: touch; scroll-behavior: smooth; }
        .course-slider::-webkit-scrollbar { height: 8px; }
        .course-slider::-webkit-scrollbar-track { background: #f1f1f1; border-radius: 10px; }
        .course-slider::-webkit-scrollbar-thumb { background: var(--primary-color); border-radius: 10px; }
        .course-slider::-webkit-scrollbar-thumb:hover { background: #4a1fb8; }
        .course-slider { scrollbar-width: thin; scrollbar-color: var(--primary-color) #f1f1f1; }
        .slick-dots, .swiper-pagination, .owl-dots { display: none !important; visibility: hidden !important; height: 0 !important; margin: 0 !important; padding: 0 !important; font-size: 0 !important; }
        .course-card { background-color: var(--white); border-radius: 8px; overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); display: flex; flex-direction: column; flex-shrink: 0; width: 300px; scroll-snap-align: start; border: 1px solid #eee; }
        .course-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15); }
        @media (max-width: 1200px) { .course-card { width: 280px; } }
        @media (max-width: 992px) { .course-card { width: 250px; } }
        @media (max-width: 768px) { .course-card { width: 220px; } }
        @media (max-width: 576px) { .course-card { width: 180px; } .course-slider { padding: 15px 10px; } }
        .course-img-container { width: 100%; height: 180px; display: flex; justify-content: center; align-items: center; background: #f5f5f5; overflow: hidden; }
        .course-img { width: 100%; height: 100%; object-fit: cover; }
        .course-info { padding: 20px; flex: 1; }
        .course-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; color: var(--text-color); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .course-instructor { font-size: 0.9rem; color: var(--text-light); margin-bottom: 10px; display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }
        .course-price { font-size: 1.2rem; font-weight: 700; color: var(--primary-color); margin-top: 10px; }
        .course-link { text-decoration: none; color: inherit; display: flex; flex-direction: column; height: 100%; }
        #logoutBtn { background-color: #ff4d4d; color: var(--white); border: none; padding: 10px 20px; border-radius: 4px; font-weight: 600; cursor: pointer; transition: var(--transition); }
        #logoutBtn:hover { background-color: #e60000; }
        @media (max-width: 992px) { .nav-links { display: none; } .mobile-nav-btn { display: block; } }
        @media (max-width: 768px) { .container { padding: 0 15px; } .logo span { display: none; } .logo i { font-size: 24px; } .auth-modal { width: 95%; padding: 1.5rem; } }
        @media (max-width: 576px) { .auth-modal { width: 100%; max-width: 100%; border-radius: 0; height: 100vh; overflow-y: auto; } .auth-overlay { align-items: flex-start; padding-top: 20px; } .login-required { width: 90%; padding: 1.5rem; } #coursehub h1 { font-size: 2rem; } }
        .mobile-dropdown { position: relative; margin-bottom: 15px; }
        .mobile-dropdown .dropdown-btn { display: flex; justify-content: space-between; align-items: center; width: 100%; padding: 12px 0; border-bottom: 1px solid #eee; font-weight: 500; cursor: pointer; }
        .mobile-dropdown .dropdown-content { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; padding-left: 15px; }
        .mobile-dropdown .dropdown-content a { display: block; padding: 10px 0; border-bottom: 1px solid #eee; color: var(--text-light); }
        .mobile-dropdown.active .dropdown-content { max-height: 500px; }
        .nav-container { background-color: #f5f5f7; border-radius: 20px; padding: 2px 5px; margin: 0 5px; }
        @media (max-width: 992px) { .logo-main { font-size: 1.6rem; } .logo-sub { font-size: 1rem; } }
        @media (max-width: 768px) { .logo-text { display: none; } }
        @media (max-width: 768px) { .logo { position: absolute; left: auto; right: 300px; margin-left: auto; } .mobile-nav-btn { position: relative; z-index: 1; } }