html,
    body {
        margin: 0;
        height: 100%;
        overflow: hidden;
        background: #87ceeb;
        font-family: 'Nunito', system-ui, Segoe UI, Roboto, sans-serif
    }

    @import url('https://fonts.googleapis.com/css2?family=Nunito:wght@700;900&display=swap');

    #hud {
        position: fixed;
        left: 50%;
        top: 16px;
        transform: translateX(-50%);
        z-index: 2;
        color: #333;
        background: rgba(255, 255, 255, .92);
        padding: 12px 28px;
        border-radius: 30px;
        font-size: 22px;
        font-weight: 700;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        display: flex;
        gap: 12px;
        align-items: center;
    }

    #hud.hide {
        display: none
    }

    .star-slot {
        width: 32px;
        height: 32px;
        background: #e0e0e0;
        border-radius: 8px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 20px;
        transition: all 0.3s;
    }

    .star-slot.filled {
        background: linear-gradient(135deg, #FFD700, #FFA000);
        animation: pop 0.4s ease-out;
    }

    @keyframes pop {
        0% {
            transform: scale(0)
        }

        50% {
            transform: scale(1.3)
        }

        100% {
            transform: scale(1)
        }
    }

    #message {
        position: fixed;
        left: 50%;
        top: 45%;
        transform: translate(-50%, -50%);
        z-index: 3;
        color: #333;
        background: white;
        padding: 20px 40px;
        border-radius: 30px;
        font-size: 26px;
        font-weight: 700;
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.25);
        display: none;
    }

    #message.show {
        display: block;
        animation: bubble 0.3s ease-out;
    }

    @keyframes bubble {
        0% {
            transform: translate(-50%, -50%) scale(0)
        }

        50% {
            transform: translate(-50%, -50%) scale(1.1)
        }

        100% {
            transform: translate(-50%, -50%) scale(1)
        }
    }

    /* Start Screen */
    #start-screen {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: linear-gradient(to bottom, #87CEEB 0%, #5BA3D9 100%);
        z-index: 100;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 30px;
    }

    #start-screen.hide {
        display: none
    }

    #start-screen h1 {
        font-size: 48px;
        font-weight: 900;
        color: white;
        text-shadow: 4px 4px 0 #0277BD, -2px -2px 0 #0277BD, 2px -2px 0 #0277BD, -2px 2px 0 #0277BD, 0 6px 20px rgba(0, 0, 0, 0.4);
        margin: 0;
        text-align: center;
    }

    #start-screen p {
        font-size: 22px;
        color: white;
        text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
        margin: 0;
    }

    .track-choice {
        display: flex;
        gap: 25px;
        margin-top: 10px;
    }

    .track-option {
        width: 130px;
        height: 150px;
        background: white;
        border-radius: 20px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 10px;
        cursor: pointer;
        transition: transform 0.2s, box-shadow 0.2s;
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
        border: 4px solid transparent;
    }

    .track-option:hover {
        transform: scale(1.05);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    }

    .track-option:active {
        transform: scale(0.95);
    }

    .track-option.selected {
        border-color: #4CAF50;
    }

    .track-option .icon {
        font-size: 40px;
    }

    .track-option .label {
        font-size: 20px;
        font-weight: 700;
        color: #333;
    }

    .track-option .desc {
        font-size: 13px;
        color: #666;
    }

    #start-btn {
        margin-top: 15px;
        padding: 18px 50px;
        font-size: 26px;
        font-weight: 700;
        color: white;
        background: linear-gradient(135deg, #4CAF50, #2E7D32);
        border: none;
        border-radius: 40px;
        cursor: pointer;
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
        transition: transform 0.15s;
    }

    #start-btn:hover {
        transform: scale(1.05);
    }

    #start-btn:active {
        transform: scale(0.95);
    }

    #track-buttons {
        position: fixed;
        bottom: 25px;
        left: 50%;
        transform: translateX(-50%);
        z-index: 2;
        display: flex;
        gap: 20px;
    }

    #track-buttons.hide {
        display: none
    }

    .track-btn {
        width: 75px;
        height: 75px;
        border-radius: 50%;
        border: 5px solid white;
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;
        transition: transform 0.1s;
    }

    .track-btn:active {
        transform: scale(0.88)
    }

    .track-btn-left {
        background: linear-gradient(135deg, #FF9800, #E65100)
    }

    .track-btn-center {
        background: linear-gradient(135deg, #4CAF50, #1B5E20)
    }

    .track-btn-right {
        background: linear-gradient(135deg, #2196F3, #0D47A1)
    }

    .track-btn::before {
        content: '';
        width: 26px;
        height: 26px;
        background: white;
    }

    .track-btn-left::before {
        clip-path: polygon(100% 0%, 100% 100%, 0% 50%)
    }

    .track-btn-center::before {
        clip-path: polygon(50% 0%, 100% 100%, 0% 100%)
    }

    .track-btn-right::before {
        clip-path: polygon(0% 0%, 0% 100%, 100% 50%)
    }

    .track-btn.hide {
        display: none
    }

    #celebration {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 10;
        display: none;
        align-items: center;
        justify-content: center;
        flex-direction: column;
    }

    #celebration.show {
        display: flex
    }

    #celebration h1 {
        font-size: 56px;
        color: white;
        text-shadow: 0 5px 20px rgba(0, 0, 0, 0.4);
        animation: bounce 0.5s ease-out;
    }

    #celebration .stars {
        font-size: 60px;
        display: flex;
        gap: 20px;
    }

    #celebration .stars span {
        animation: spin 1s ease-in-out infinite;
    }

    #celebration .stars span:nth-child(2) {
        animation-delay: 0.2s
    }

    #celebration .stars span:nth-child(3) {
        animation-delay: 0.4s
    }

    @keyframes bounce {
        0% {
            transform: scale(0)
        }

        50% {
            transform: scale(1.2)
        }

        100% {
            transform: scale(1)
        }
    }

    @keyframes spin {

        0%,
        100% {
            transform: rotate(-10deg) scale(1)
        }

        50% {
            transform: rotate(10deg) scale(1.2)
        }
    }

    /* Tunnel darkness overlay */
    #tunnel-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(20, 15, 10, 0);
        z-index: 1;
        pointer-events: none;
        transition: background 0.4s;
    }

    #tunnel-overlay.dark {
        background: rgba(20, 15, 10, 0.5);
    }

    #tunnel-text {
        position: fixed;
        top: 80px;
        left: 50%;
        transform: translateX(-50%);
        background: rgba(0, 0, 0, 0.6);
        color: white;
        padding: 8px 20px;
        border-radius: 20px;
        font-size: 16px;
        font-weight: 600;
        opacity: 0;
        transition: opacity 0.3s;
        z-index: 5;
    }

    #tunnel-text.show {
        opacity: 1
    }