:root {
            --primary-color: #2c3e50;
            --secondary-color: #3498db;
            --text-color: #333;
            --bg-color: #f9f9f9;
            --card-bg: #fff;
            --header-bg: #2c3e50;
            --footer-bg: #2c3e50;
            --nav-hover: #2980b9;
            --border-color: #ddd;
            --shadow-color: rgba(0, 0, 0, 0.1);
        }

        .dark-mode {
            --primary-color: #3498db;
            --secondary-color: #2980b9;
            --text-color: #f0f0f0;
            --bg-color: #121212;
            --card-bg: #1e1e1e;
            --header-bg: #121212;
            --footer-bg: #121212;
            --nav-hover: #4aa3df;
            --border-color: #444;
            --shadow-color: rgba(0, 0, 0, 0.3);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            transition: background-color 0.3s, color 0.3s;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text-color);
            background-color: var(--bg-color);
        }

        .container {
            width: 90%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }

        header {
            background-color: var(--header-bg);
            color: white;
            padding: 1rem 0;
            box-shadow: 0 2px 5px var(--shadow-color);
            /* position: sticky; */
            top: 0;
            z-index: 100;
        }

        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-size: 1.8rem;
            font-weight: bold;
            color: white;
            text-decoration: none;
        }

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

        nav ul {
            display: flex;
            list-style: none;
        }

        nav ul li {
            margin-left: 1.5rem;
        }

        nav ul li a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            padding: 0.5rem 0;
            position: relative;
        }

        nav ul li a:hover {
            color: var(--nav-hover);
        }

        nav ul li a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--nav-hover);
            transition: width 0.3s;
        }

        nav ul li a:hover::after {
            width: 100%;
        }

        .mode-toggle {
            background: none;
            border: none;
            color: white;
            font-size: 1.2rem;
            cursor: pointer;
            margin-left: 1rem;
        }

        .hero {
            background: linear-gradient(rgba(44, 62, 80, 0.8), rgba(44, 62, 80, 0.8)), url('https://images.unsplash.com/photo-1434030216411-0b793f4b4173?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 4rem 0;
            text-align: center;
        }

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

        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 2rem;
        }

        .btn {
            display: inline-block;
            background-color: var(--secondary-color);
            color: white;
            padding: 0.8rem 1.5rem;
            border-radius: 5px;
            text-decoration: none;
            font-weight: bold;
            transition: background-color 0.3s;
        }

        .btn:hover {
            background-color: var(--nav-hover);
        }

        section {
            padding: 3rem 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: 2rem;
            color: var(--primary-color);
            position: relative;
        }

        .section-title::after {
            content: '';
            display: block;
            width: 80px;
            height: 3px;
            background-color: var(--secondary-color);
            margin: 0.5rem auto 0;
        }

        .card {
            background-color: var(--card-bg);
            border-radius: 8px;
            box-shadow: 0 4px 6px var(--shadow-color);
            padding: 1.5rem;
            margin-bottom: 1.5rem;
            border: 1px solid var(--border-color);
        }

        .card h3 {
            color: var(--primary-color);
            margin-bottom: 1rem;
            font-size: 1.3rem;
        }

        .card ul {
            padding-left: 1.5rem;
        }

        .card ul li {
            margin-bottom: 0.5rem;
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1.5rem;
        }

        .college-list {
            columns: 2;
            column-gap: 2rem;
        }

        .college-list li {
            margin-bottom: 0.5rem;
            break-inside: avoid;
        }

        .accordion {
            margin-bottom: 1rem;
        }

        .accordion-header {
            background-color: var(--primary-color);
            color: white;
            padding: 1rem;
            border-radius: 5px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .accordion-header:hover {
            background-color: var(--nav-hover);
        }

        .accordion-content {
            padding: 1rem;
            background-color: var(--card-bg);
            border-radius: 0 0 5px 5px;
            border: 1px solid var(--border-color);
            border-top: none;
            display: none;
        }

        .accordion.active .accordion-content {
            display: block;
        }

        footer {
            background-color: var(--footer-bg);
            color: white;
            padding: 2rem 0;
            text-align: center;
        }

        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .social-links {
            margin: 1rem 0;
        }

        .social-links a {
            color: white;
            margin: 0 0.5rem;
            font-size: 1.5rem;
            transition: color 0.3s;
        }

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

        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                text-align: center;
            }

            nav ul {
                margin-top: 1rem;
                flex-wrap: wrap;
                justify-content: center;
            }

            nav ul li {
                margin: 0.5rem;
            }

            .hero h1 {
                font-size: 2rem;
            }

            .college-list {
                columns: 1;
            }

            .grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 480px) {

            .card {
                padding: 0.5rem;
            }

            .container {
                padding: 0 0px;
            }

            .hero {
                padding: 3rem 0;
            }

            .hero h1 {
                font-size: 1.8rem;
            }

            .hero p {
                font-size: 1rem;
            }

            .section-title {
                font-size: 1.5rem;
            }
        }