body {
            font-family: Georgia, serif;
            background: url('background.jpeg') no-repeat center center fixed;
            background-size: cover;
            color: white;
            text-align: center;
            margin: 0;
            padding: 20px;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
        }

        .top-banner {
            background-color: white;
            color: black;
            text-align: center;
            padding: 10px 0;
            position: fixed;
            width: 100vw;
            top: 0;
            z-index: 1000;
            border-bottom: 3px solid #ddd;
        }

        .top-banner a {
            margin: 0 15px;
            text-decoration: none;
            font-size: 18px;
            font-weight: normal;
            color: #000;
        }

        .logo {
            position: absolute;
            top: 40px;
            left: 10px;
            width: 80px;
            height: auto;
            z-index: 1100;
        }

        .logo-image {
            width: 50px;
            height: auto;
        }

        .countdown-container {
            background-color: rgba(0, 0, 0, 0.8);
            border-radius: 20px;
            padding: 40px;
            margin-top: 100px;
            max-width: 600px;
            border: 2px solid white;
            box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
        }

        .countdown-title {
            font-size: 2.5em;
            margin-bottom: 30px;
            color: #ffffff;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
        }

        .setup-form {
            margin-bottom: 30px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            font-size: 1.2em;
            margin-bottom: 10px;
            color: #ffffff;
        }

        input[type="datetime-local"] {
            padding: 10px;
            font-size: 1.1em;
            border: 2px solid navy;
            border-radius: 8px;
            background-color: rgba(255, 255, 255, 0.9);
            color: #000;
            width: 250px;
        }

        button {
            background-color: navy;
            color: white;
            border: none;
            border-radius: 10px;
            padding: 15px 30px;
            font-size: 1.1em;
            cursor: pointer;
            transition: background-color 0.3s, transform 0.2s;
            margin: 10px;
        }

        button:hover {
            background-color: #003366;
            transform: scale(1.05);
        }

        .countdown-display {
            display: none;
            margin-top: 20px;
        }

        .countdown-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }

        .time-unit {
            background-color: rgba(25, 25, 112, 0.8);
            border-radius: 15px;
            padding: 20px;
            border: 2px solid white;
        }

        .time-number {
            font-size: 3em;
            font-weight: bold;
            color: #ffffff;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
        }

        .time-label {
            font-size: 1.2em;
            color: #ffffff;
            margin-top: 10px;
        }

        .school-info {
            margin-bottom: 20px;
            font-size: 1.1em;
            color: #ffffff;
        }

        .finished-message {
            display: none;
            font-size: 2em;
            color: #ffdd00;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
            margin: 20px 0;
        }

        .back-home {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background-color: navy;
            color: white;
            padding: 10px 20px;
            border-radius: 8px;
            text-decoration: none;
            transition: background-color 0.3s;
        }

        .back-home:hover {
            background-color: #003366;
        }

        .h {
            font-family: Georgia, serif;
            color: rgb(0, 0, 0);
            text-align: center;
            margin: 0;
            padding: 30px;
            text-decoration: none !important;
        }

        .c {
            font-family: Georgia, serif;
            color: rgb(104, 103, 103);
            text-align: center;
            margin: 0;
            padding: 30px;
            text-decoration: none !important;
        }