.main-header {
    background-color: var(--card-bg);
    padding: 30px 0;
    text-align: center;
    box-shadow: 0 2px 10px var(--shadow-base);
    position: fix;
    top: 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.dark-theme .main-header {
    background-color: var(--card-bg);
    box-shadow: 0 2px 10px var(--shadow-base);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.main-header h1 {
    font-size: 3.5em;
    margin-bottom: 10px;
    background: linear-gradient(90deg, var(--accent-color), var(--primary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
    animation: gradient-move 5s infinite alternate ease-in-out;
}

@keyframes gradient-move {
    0% { background-position: 0% 50%; }
    100% { background-position: 100% 50%; }
}

.main-header .subtitle {
    font-size: 1.2em;
    color: var(--text-color);
    opacity: 0.8;
    margin-bottom: 25px;
}

.main-nav {
    width: 100%;
}

.main-nav ul {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 25px;
    padding: 0;
    list-style: none;
    margin: 0;
}

.main-nav a {
    color: var(--text-color);
    font-weight: 600;
    font-size: 1.1em;
    padding: 8px 15px;
    border-radius: 6px;
    transition: background-color 0.3s ease, color 0.3s ease;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    display: inline-block;
}

.dark-theme .main-nav a {
    color: var(--text-color);
}

.main-nav a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--accent-color);
    transform: translateX(-100%);
    transition: transform 0.3s ease-out;
}

.main-nav a:hover::before {
    transform: translateX(0);
}

.main-nav a.active {
    color: var(--accent-color);
}

.main-nav a.active::before {
    transform: translateX(0);
}


.main-nav a:hover {
    color: var(--accent-color);
}

main {
    flex-grow: 1;
    padding-top: 30px;
    padding-bottom: 50px;
}


.main-footer {
   
    background-color: var(--card-bg);
    color: var(--text-color);
    opacity: 0.7;
    padding: 30px 0;
    text-align: center;
    box-shadow: 0 -2px 10px var(--shadow-base);
    margin-top: auto; 
}

.dark-theme .main-footer {
    background-color: var(--card-bg);
    box-shadow: 0 -2px 10px var(--shadow-base);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.footer-links {
    margin-bottom: 20px;
}

.footer-links a {
    color: var(--text-color);
    opacity: 0.8;
    margin: 0 15px;
    font-weight: 500;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--accent-color);
}

.social-links {
    margin-bottom: 20px;
    font-size: 1.5em;
}

.social-links a {
    color: var(--text-color);
    opacity: 0.8;
    margin: 0 10px;
    transition: color 0.3s ease, transform 0.2s ease;
}

.social-links a:hover {
    color: var(--accent-color);
    transform: translateY(-3px);
}

.copyright {
    font-size: 0.9em;
    opacity: 0.7;
}


.global-controls {
    position: fixed;
    bottom: 20px;
    left: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 1001;
}

.control-btn {
    padding: 10px 18px;
    font-size: 0.95em;
    border-radius: 30px;
    background-color: var(--button-bg);
    color: var(--button-text);
    box-shadow: 0 4px 8px var(--shadow-base);
}

.dark-theme .control-btn {
    background-color: var(--button-bg);
    color: var(--button-text);
}

.control-btn:hover {
    background-color: var(--button-hover-bg);
    transform: translateY(-3px);
}

.dark-theme .control-btn:hover {
    background-color: var(--button-hover-bg);
}

.volume-control {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--button-bg);
    padding: 8px 15px;
    border-radius: 30px;
    color: var(--button-text);
    box-shadow: 0 4px 8px var(--shadow-base);
}

.dark-theme .volume-control {
    background-color: var(--button-bg);
    color: var(--button-text);
}

.volume-control label {
    font-size: 0.9em;
    white-space: nowrap;
}

#volume-slider {
    width: 100px;
    height: 6px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 5px;
    outline: none;
    transition: 0.3s ease;
}

#volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: grab;
    transition: background-color 0.3s ease;
}

#volume-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: grab;
    transition: background-color 0.3s ease;
}

.dark-theme #volume-slider::-webkit-slider-thumb,
.dark-theme #volume-slider::-moz-range-thumb {
    background: var(--primary-color);
}


#top-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 16px;
    border-radius: 50%;
    font-size: 1.5em;
    line-height: 1;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s ease, transform 0.2s ease, background-color 0.3s ease;
    z-index: 1000;
    box-shadow: 0 4px 8px var(--shadow-base);
}

#top-btn.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#top-btn:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.dark-theme #top-btn {
    background-color: var(--primary-color);
}

.dark-theme #top-btn:hover {
    background-color: var(--accent-color);
}


@media (max-width: 768px) {
    .global-controls {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        bottom: 10px;
        left: 50%;
        transform: translateX(-50%);
        width: 90%;
        gap: 8px;
        background-color: var(--card-bg);
        padding: 10px;
        border-radius: 12px;
        box-shadow: 0 2px 10px var(--shadow-base);
    }
    .dark-theme .global-controls {
        background-color: var(--card-bg);
    }

    .control-btn, .volume-control {
        flex: 1 1 auto;
        font-size: 0.85em;
        padding: 8px 12px;
        white-space: nowrap;
    }
    .volume-control label {
        display: none; 
    }
    #volume-slider {
        width: 100%;
    }
    #top-btn {
        bottom: 80px;
        right: 15px;
        padding: 10px 14px;
        font-size: 1.2em;
    }
}