* {
    box-sizing: border-box;
}

html, body {
    height: 100%;
    width: 100%;
    margin: 0;
}

body {
    position: relative;
    min-height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

#top-container {
    position: relative;
    background: url("img/bg.png") no-repeat center center / cover;
    flex: 0 0 175px;
}

.top-mask {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: -41px;
    overflow: hidden;
    pointer-events: none;
}

.alexia {
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) translateY(-5%);
    height: 100%;
    width: auto;
    max-width: none;
    pointer-events: none;
}

#page-nav-container {
    position: fixed;
    left: 20px;
    top: 20px;
    height: auto;
    z-index: 100;
}

#page-nav-btn {
    position: absolute;
    left: 0;
    top: 0;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(128, 128, 128, 0.5);
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

#page-nav-btn:hover {
    background: rgba(128, 128, 128, 0.7);
}

#page-nav-btn::after {
    content: '☰';
    color: white;
    font-size: 24px;
}

#page-nav-container.expanded #page-nav-btn {
    width: 100%;
    height: auto;
    border-radius: 0 16px 0 0;
    background: transparent;
    padding: 15px;
    position: relative;
}

#page-nav-container.expanded #page-nav-btn::after {
    content: '✕';
    font-size: 20px;
}

#page-nav {
    position: absolute;
    left: 0;
    top: 50px;
    transform: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 15px;
    background: rgba(128, 128, 128, 0.5);
    border: none;
    border-radius: 0 16px 16px 16px;
    max-height: 90vh;
    overflow-y: auto;
    width: fit-content;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

#page-nav-container.expanded #page-nav {
    opacity: 1;
    pointer-events: auto;
}

.page-btn {
    padding: 10px 16px;
    background: rgba(255, 255, 255, 0.25);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.5);
    cursor: pointer;
    font-weight: bold;
    transition: all 0.2s;
    white-space: nowrap;
    border-radius: 6px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
}

.page-btn.active {
    background: rgba(255, 255, 255, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.7);
}

.page-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.6);
}

.page-btn.active:hover {
    background: rgba(255, 255, 255, 0.5);
}

#can {
    border: 2.5px solid white;
}

#loading-indicator {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 200;
    display: none;
}

#loading-indicator.active {
    display: block;
}

#refresh-btn {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: rgba(128, 128, 128, 0.5);
    border: none;
    cursor: pointer;
    font-size: 24px;
    color: white;
    transition: all 0.3s ease;
    z-index: 99;
}

#refresh-btn:hover {
    background: rgba(128, 128, 128, 0.7);
}

/* Portrait mode for mobile */
@media (max-width: 768px) and (orientation: portrait) {
    #top-container {
        height: 15vh;
    }

    #topImage {
        width: 30%;
        translate: -20% 0;
    }

    .corner {
        flex-basis: 35%;
    }

    #buffer {
        flex-basis: 30%;
    }

    #can {
        border: 3px solid white;
    }

    #refresh-btn {
        width: 45px;
        height: 45px;
        font-size: 20px;
        top: 15px;
        right: 15px;
    }

    #page-nav-btn {
        width: 45px;
        height: 45px;
    }
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Mobile adjustments */
@media (max-width: 768px) {
    #topImage {
        width: 50%;
        translate: -30% 0;
    }
    .corner {
        flex-basis: 25%;
    }
    #buffer {
        flex-basis: 50%;
    }

}