/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    overflow-x: hidden;
    font-family: 'Fredoka', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    font-weight: 400;
    background: #f0f0f0; /* Fallback color */
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    scroll-behavior: smooth;
}

/* Ensure form elements inherit Fredoka font */
button, input, select, textarea, option {
    font-family: inherit;
}

/* Game section container */
#gameSection {
    position: relative;
    height: 100vh;
    overflow: hidden;
    width: 100%;
}

/* Background container */
.background-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.background-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: opacity 1.5s ease-in-out;
}

.background-layer.current {
    opacity: 1;
    z-index: 1;
}

.background-layer.next {
    opacity: 0;
    z-index: 2;
}

.background-layer.transitioning {
    opacity: 1;
}

/* Default gradient background */
.background-layer.gradient {
    background: linear-gradient(135deg, #87CEEB 0%, #ffffff 100%);
}

/* Full-screen canvas */
#bubbleCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
    z-index: 1;
    touch-action: none;
}

/* UI Controls */
.ui-controls {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 10;
    display: flex;
    gap: 12px;
    align-items: flex-start;
}

/* Logo */
.logo {
    position: absolute;
    top: 20px;
    left: 20px;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border-radius: 20px;
    padding: 8px 16px;
    transition: all 0.2s ease;
    opacity: 0.9;
    cursor: default;
}

.logo:hover {
    background: rgba(255, 255, 255, 0.8);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
    opacity: 1;
}

.logo-icon {
    font-size: 20px;
    line-height: 1;
}

.logo-text {
    font-size: 16px;
    font-weight: 600;
    color: #4a90e2;
    text-decoration: none;
    letter-spacing: -0.02em;
}

/* Audio Controls Container */
.audio-controls {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}

/* Pop Counter */
.pop-counter {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border-radius: 24px;
    padding: 8px 16px;
    gap: 6px;
    transition: all 0.2s ease;
    opacity: 0.8;
}

.pop-counter:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
    opacity: 1;
}

.counter-icon {
    font-size: 16px;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.1));
}

.counter-value {
    font-size: 16px;
    font-weight: 600;
    color: #6ba3e5;
    min-width: 20px;
    text-align: center;
    transition: all 0.3s ease;
}

.pop-counter:hover .counter-value {
    color: #4a90e2;
}

.counter-value.updated {
    transform: scale(1.2);
    color: #27ae60;
}

/* Dark background text adjustments (for galaxy and aurora backgrounds) */
.dark-background .logo-text {
    color: white !important;
}

.dark-background .counter-value {
    color: rgba(255, 255, 255, 0.9) !important;
}

.dark-background .pop-counter:hover .counter-value {
    color: white !important;
}

.dark-background .counter-value.updated {
    color: #2ecc71 !important;
}

.dark-background .theme-select,
.dark-background .background-select {
    color: white !important;
}

/* Settings Toggle Button */
.settings-toggle {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.8;
    position: relative;
}

.settings-toggle:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
    opacity: 1;
}

.settings-icon {
    font-size: 18px;
    transition: transform 0.3s ease;
}

.settings-toggle.active .settings-icon {
    transform: rotate(90deg);
}

/* Collapsible Settings Container */
.collapsible-settings {
    position: absolute;
    top: 80px;
    right: 10px;
    z-index: 15;
    display: none;
    flex-direction: column;
    gap: 8px;
    align-items: flex-end;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(-10px);
    padding: 16px;
}

.collapsible-settings.show {
    display: flex;
    opacity: 1;
    transform: translateY(0);
}


/* Theme Selector */
.theme-selector {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border-radius: 20px;
    padding: 6px 12px;
    transition: all 0.2s ease;
    opacity: 0.8;
}

.theme-selector:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
    opacity: 1;
}

.theme-select {
    background: transparent;
    border: none;
    color: #4a90e2;
    font-size: 14px;
    font-weight: 500;
    outline: none;
    cursor: pointer;
    min-width: 100px;
    padding: 2px 4px;
}

.theme-select:focus {
    outline: 2px solid rgba(74, 144, 226, 0.3);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Background Selector */
.background-selector {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border-radius: 20px;
    padding: 6px 12px;
    transition: all 0.2s ease;
    opacity: 0.8;
}

.background-selector:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
    opacity: 1;
}

.background-select {
    background: transparent;
    border: none;
    color: #4a90e2;
    font-size: 14px;
    font-weight: 500;
    outline: none;
    cursor: pointer;
    min-width: 120px;
    padding: 2px 4px;
}

.background-select:focus {
    outline: 2px solid rgba(74, 144, 226, 0.3);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Volume Control */
.volume-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border-radius: 20px;
    padding: 8px 6px;
    transition: all 0.2s ease;
    min-width: 48px;
    opacity: 0.8;
}

.volume-control:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
    opacity: 1;
}

/* Volume Slider */
.volume-slider {
    writing-mode: bt-lr; /* IE */
    -webkit-appearance: slider-vertical; /* WebKit */
    width: 6px;
    height: 80px;
    background: transparent;
    outline: none;
    margin: 4px 0;
    cursor: pointer;
}

/* Custom slider for WebKit browsers */
.volume-slider::-webkit-slider-track {
    width: 6px;
    height: 80px;
    background: linear-gradient(to top, #ddd 0%, #4a90e2 100%);
    border-radius: 3px;
    border: none;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: #4a90e2;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    transition: all 0.2s ease;
}

.volume-slider::-webkit-slider-thumb:hover {
    background: #5ba0f2;
    transform: scale(1.1);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.3);
}

/* Custom slider for Firefox */
.volume-slider::-moz-range-track {
    width: 6px;
    height: 80px;
    background: linear-gradient(to top, #ddd 0%, #4a90e2 100%);
    border-radius: 3px;
    border: none;
}

.volume-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: #4a90e2;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    transition: all 0.2s ease;
}

.volume-slider::-moz-range-thumb:hover {
    background: #5ba0f2;
    transform: scale(1.1);
}

/* Volume Labels */
.volume-labels {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 80px;
    font-size: 10px;
    opacity: 0.4;
    pointer-events: none;
    position: absolute;
    right: -20px;
    top: 12px;
    transition: opacity 0.2s ease;
}

.volume-control:hover .volume-labels {
    opacity: 0.7;
}

.volume-label-max {
    align-self: flex-start;
}

.volume-label-min {
    align-self: flex-end;
}

/* Slider Labels (top emoji labels for volume and speed controls) */
.slider-label {
    font-size: 16px;
    margin-bottom: 4px;
    opacity: 0.8;
    transition: opacity 0.2s ease;
}

/* Speed Control */
.speed-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border-radius: 20px;
    padding: 8px 6px;
    transition: all 0.2s ease;
    min-width: 48px;
    opacity: 0.8;
}

.speed-control:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
    opacity: 1;
}

/* Speed Slider */
.speed-slider {
    writing-mode: bt-lr; /* IE */
    -webkit-appearance: slider-vertical; /* WebKit */
    width: 6px;
    height: 80px;
    background: transparent;
    outline: none;
    margin: 4px 0;
    cursor: pointer;
}

/* Custom slider for WebKit browsers */
.speed-slider::-webkit-slider-track {
    width: 6px;
    height: 80px;
    background: linear-gradient(to top, #ddd 0%, #e67e22 100%);
    border-radius: 3px;
    border: none;
}

.speed-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: #e67e22;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    transition: all 0.2s ease;
}

.speed-slider::-webkit-slider-thumb:hover {
    background: #d35400;
    transform: scale(1.1);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.3);
}

/* Custom slider for Firefox */
.speed-slider::-moz-range-track {
    width: 6px;
    height: 80px;
    background: linear-gradient(to top, #ddd 0%, #e67e22 100%);
    border-radius: 3px;
    border: none;
}

.speed-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: #e67e22;
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    transition: all 0.2s ease;
}

.speed-slider::-moz-range-thumb:hover {
    background: #d35400;
    transform: scale(1.1);
}

/* Speed Labels */
.speed-labels {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 80px;
    font-size: 10px;
    opacity: 0.4;
    pointer-events: none;
    position: absolute;
    right: -20px;
    top: 12px;
    transition: opacity 0.2s ease;
}

.speed-control:hover .speed-labels {
    opacity: 0.7;
}

.speed-label-max {
    align-self: flex-start;
}

.speed-label-min {
    align-self: flex-end;
}

/* Density Control */
.density-control {
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    border-radius: 20px;
    padding: 8px 6px;
    transition: all 0.2s ease;
    min-width: 48px;
    opacity: 0.8;
}

.density-control:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
    opacity: 1;
}

/* Density Slider */
.density-slider {
    writing-mode: bt-lr; /* IE */
    -webkit-appearance: slider-vertical; /* WebKit */
    width: 6px;
    height: 80px;
    background: transparent;
    outline: none;
    margin: 4px 0;
    cursor: pointer;
}

/* Custom slider for WebKit browsers */
.density-slider::-webkit-slider-track {
    width: 6px;
    height: 80px;
    background: linear-gradient(to top, #e0e0e0, #cccccc);
    border-radius: 3px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

.density-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: linear-gradient(135deg, #9b59b6, #8e44ad);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(142, 68, 173, 0.3);
    transition: all 0.2s ease;
}

.density-slider::-webkit-slider-thumb:hover {
    background: linear-gradient(135deg, #a569c7, #9c4dbd);
    transform: scale(1.1);
    box-shadow: 0 3px 8px rgba(142, 68, 173, 0.4);
}

/* Firefox */
.density-slider::-moz-range-track {
    width: 80px;
    height: 6px;
    background: linear-gradient(to right, #e0e0e0, #cccccc);
    border-radius: 3px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    border: none;
}

.density-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: linear-gradient(135deg, #9b59b6, #8e44ad);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(142, 68, 173, 0.3);
    transition: all 0.2s ease;
}

.density-slider::-moz-range-thumb:hover {
    background: linear-gradient(135deg, #a569c7, #9c4dbd);
    transform: scale(1.1);
    box-shadow: 0 3px 8px rgba(142, 68, 173, 0.4);
}

/* Screen reader only content */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, #87CEEB 0%, #ffffff 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    transition: opacity 0.5s ease;
}

.loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
    color: #4a90e2;
}

.loading-bubble {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(255, 255, 255, 0.8), rgba(135, 206, 235, 0.3));
    border: 2px solid rgba(135, 206, 235, 0.4);
    margin: 0 auto 20px;
    animation: float 2s ease-in-out infinite alternate;
}

@keyframes float {
    0% { transform: translateY(0px) scale(1); }
    100% { transform: translateY(-10px) scale(1.05); }
}

.loading-content p {
    font-size: 16px;
    font-weight: 500;
    opacity: 0.8;
}

/* Start Screen */
.start-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: linear-gradient(135deg, #87CEEB 0%, #ffffff 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.start-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.start-content {
    text-align: center;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 40px 60px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    animation: fadeInUp 0.8s ease-out;
}

.start-content h1 {
    font-size: 2.5rem;
    font-weight: 500;
    color: #2c3e50;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.start-content p {
    font-size: 1.1rem;
    color: #7f8c8d;
    margin-bottom: 30px;
    font-weight: 400;
}

/* Mobile headphones tip - hidden by default, shown only on mobile */
.mobile-headphones-tip {
    display: none !important;
    font-size: 0.95rem !important;
    color: #3498db !important;
    margin-bottom: 20px !important;
    font-weight: 500 !important;
    text-align: center;
    background: rgba(52, 152, 219, 0.1);
    padding: 12px 16px;
    border-radius: 12px;
    border-left: 3px solid #3498db;
}

.start-button {
    background: linear-gradient(135deg, #4a90e2 0%, #357abd 100%);
    color: white;
    border: none;
    padding: 16px 32px;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 20px rgba(74, 144, 226, 0.3);
    min-width: 160px;
}

.start-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(74, 144, 226, 0.4);
    background: linear-gradient(135deg, #5ba0f2 0%, #4680cd 100%);
}

.start-button:active {
    transform: translateY(0);
    box-shadow: 0 6px 15px rgba(74, 144, 226, 0.3);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Ad Containers - TEMPORARILY COMMENTED OUT FOR GOOGLE ADSENSE APPROVAL */
/*
.ad-container {
    position: fixed;
    z-index: 5;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    padding: 8px;
    transition: opacity 0.3s ease;
}

.ad-container a {
    display: block;
    width: 100%;
    height: 100%;
    transition: transform 0.2s ease;
}

.ad-container a:hover {
    transform: scale(1.02);
}

.ad-container img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px;
}

.ad-container:empty {
    display: none;
}

.static-ad-container {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    z-index: 6;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
    padding: 8px;
    border-radius: 8px 8px 0 0;
    transition: opacity 0.3s ease;
}

.static-ad-container a {
    display: block;
    width: 100%;
    height: 100%;
    transition: transform 0.2s ease;
}

.static-ad-container a:hover {
    transform: scale(1.02);
}

.static-ad-container img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 4px;
}

.ad-container-bottom {
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    max-width: 100vw;
    border-radius: 8px 8px 0 0;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
    display: none;
}

.ad-container-left {
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    max-height: 80vh;
    border-radius: 0 8px 8px 0;
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
    width: 160px;
    display: none;
}
*/



/* Responsive Design */

/* Mobile Portrait */
@media (max-width: 480px) {
    .ui-controls {
        top: 10px;
        right: 10px;
        flex-direction: column;
        gap: 8px;
        align-items: flex-end;
    }

    .logo {
        top: 10px;
        left: 10px;
        padding: 6px 10px;
        border-radius: 16px;
    }

    .logo-icon {
        font-size: 16px;
    }

    .logo-text {
        font-size: 12px;
    }

    .pop-counter {
        padding: 6px 12px;
        border-radius: 20px;
    }

    .counter-icon {
        font-size: 14px;
    }

    .counter-value {
        font-size: 14px;
        min-width: 18px;
    }

    .theme-selector {
        padding: 4px 8px;
        border-radius: 16px;
    }

    .theme-select {
        font-size: 12px;
        min-width: 80px;
        padding: 2px;
    }

    .background-selector {
        padding: 4px 8px;
        border-radius: 16px;
    }

    .background-select {
        font-size: 12px;
        min-width: 90px;
        padding: 2px;
    }

    .audio-controls {
        gap: 6px;
    }

    .volume-control {
        padding: 6px 4px;
        min-width: 44px;
    }

    .speed-control {
        padding: 6px 4px;
        min-width: 44px;
    }

    .volume-slider {
        height: 60px;
        width: 5px;
    }

    .volume-slider::-webkit-slider-track {
        height: 60px;
        width: 5px;
    }

    .volume-slider::-webkit-slider-thumb {
        width: 14px;
        height: 14px;
    }

    .volume-slider::-moz-range-track {
        height: 60px;
        width: 5px;
    }

    .volume-slider::-moz-range-thumb {
        width: 14px;
        height: 14px;
    }

    .volume-labels {
        height: 60px;
        font-size: 9px;
        right: -18px;
        top: 10px;
    }

    .speed-slider {
        height: 60px;
        width: 5px;
    }

    .speed-slider::-webkit-slider-track {
        height: 60px;
        width: 5px;
    }

    .speed-slider::-webkit-slider-thumb {
        width: 14px;
        height: 14px;
    }

    .speed-slider::-moz-range-track {
        height: 60px;
        width: 5px;
    }

    .speed-slider::-moz-range-thumb {
        width: 14px;
        height: 14px;
    }

    .speed-labels {
        height: 60px;
        font-size: 9px;
        right: -18px;
        top: 10px;
    }

    /* Ad containers commented out for AdSense approval
    .ad-container-bottom {
        width: 320px;
        height: 50px;
    }

    .static-ad-container {
        width: 320px;
        height: 50px;
    }
    */


    .loading-bubble {
        width: 50px;
        height: 50px;
    }

    .loading-content p {
        font-size: 14px;
    }

    .start-content {
        padding: 30px 40px;
        margin: 0 20px;
    }

    .start-content h1 {
        font-size: 2rem;
    }

    .start-content p {
        font-size: 1rem;
        margin-bottom: 25px;
    }

    /* Show mobile tips on mobile devices */
    .mobile-headphones-tip,
    .mobile-silent-tip {
        display: block !important;
        font-size: 0.9rem !important;
        margin-bottom: 20px !important;
    }

    .start-button {
        padding: 14px 28px;
        font-size: 1.1rem;
        min-width: 140px;
    }
}

/* Small screens and tablets */
@media (max-width: 768px) {
    .ui-controls {
        top: 12px;
        right: 12px;
        gap: 10px;
    }

    /* Mobile settings behavior - hide settings by default */
    .collapsible-settings {
        display: none;
        right: 0px;
        top: 90px;
        align-items: flex-end;
        padding: 12px;
    }

    .collapsible-settings.show {
        display: flex;
    }

    .settings-toggle {
        width: 36px;
        height: 36px;
    }

    .settings-icon {
        font-size: 16px;
    }

    .logo {
        top: 12px;
        left: 12px;
        padding: 6px 12px;
    }

    .logo-icon {
        font-size: 18px;
    }

    .logo-text {
        font-size: 14px;
    }

    .background-select {
        min-width: 100px;
    }
}

/* Mobile Landscape */
@media (max-width: 768px) and (orientation: landscape) {
    .ui-controls {
        top: 8px;
        right: 8px;
        flex-direction: row;
        gap: 6px;
    }

    .logo {
        top: 8px;
        left: 8px;
        padding: 4px 8px;
    }


    .volume-control {
        padding: 4px 3px;
        min-width: 36px;
    }

    .volume-slider {
        height: 50px;
        width: 4px;
    }
}


/* Tablet - Bottom ad sizing - COMMENTED OUT FOR ADSENSE APPROVAL */
/*
@media (min-width: 481px) and (max-width: 1024px) {
    .ad-container-bottom {
        width: 468px;
        height: 60px;
    }

    .static-ad-container {
        width: 468px;
        height: 60px;
    }
}
*/

/* Desktop - Bottom ad sizing - COMMENTED OUT FOR ADSENSE APPROVAL */
/*
@media (min-width: 1025px) {
    .ad-container-bottom {
        width: 728px;
        height: 90px;
    }

    .static-ad-container {
        width: 728px;
        height: 90px;
    }
}
*/

/* Desktop - Show side ads on larger screens - COMMENTED OUT FOR ADSENSE APPROVAL */
/*
@media (min-width: 1200px) {
    .ad-container-left {
        display: block;
    }

    .container {
        max-width: 800px;
        padding: 0 40px;
    }
}
*/

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 100px; /* Increased spacing for better positioning */
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
    z-index: 10;
    animation: bounce 2s infinite;
    cursor: pointer;
    transition: color 0.3s ease;
}

/* Blue color for better visibility on gradient background */
.scroll-indicator.blue-text {
    color: #4a90e2;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.scroll-text {
    display: block;
    font-size: 14px;
    margin-bottom: 5px;
    font-weight: 500;
}

.scroll-arrow {
    display: block;
    font-size: 20px;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* SEO Content Sections */
.content-sections {
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
    position: relative;
    z-index: 2;
}

.content-section {
    padding: 60px 0;
    border-bottom: 1px solid #e2e8f0;
}

.content-section:last-child {
    border-bottom: none;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 40px;
}

.content-section h2 {
    font-size: 32px;
    font-weight: 600;
    color: #1a202c;
    text-align: center;
    margin-bottom: 24px;
    line-height: 1.2;
}

.content-section p {
    font-size: 18px;
    line-height: 1.7;
    color: #4a5568;
    margin-bottom: 20px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.content-section strong {
    color: #2d3748;
    font-weight: 600;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 40px;
}

.benefit {
    text-align: center;
    padding: 30px 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.benefit:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.benefit h3 {
    font-size: 20px;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 12px;
}

.benefit p {
    font-size: 16px;
    color: #718096;
    margin: 0;
}

/* Features List */
.features-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.feature {
    padding: 24px;
    background: white;
    border-radius: 8px;
    border-left: 4px solid #4a90e2;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.feature h3 {
    font-size: 18px;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 8px;
}

.feature p {
    font-size: 16px;
    color: #718096;
    margin: 0;
    line-height: 1.5;
    text-align: left;
}

/* Testimonial */
.testimonial {
    background: #4a90e2;
    color: white;
    padding: 30px;
    border-radius: 12px;
    font-style: italic;
    font-size: 18px;
    text-align: center;
    margin-top: 40px;
    border-left: none;
}

/* Themes Grid */
.themes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
    margin: 40px 0;
}

.theme-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s ease;
}

.theme-card:hover {
    transform: translateY(-3px);
}

.theme-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 12px;
}

.theme-card p {
    font-size: 16px;
    color: #718096;
    margin: 0;
    line-height: 1.5;
}

/* Student Scenarios Grid */
.student-scenarios {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin: 40px 0;
}

.scenario {
    background: white;
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s ease;
    border: 1px solid rgba(135, 206, 235, 0.2);
}

.scenario:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.1);
}

.scenario h3 {
    font-size: 18px;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 12px;
}

.scenario p {
    font-size: 15px;
    color: #718096;
    margin: 0;
    line-height: 1.6;
}

/* Academic Stats */
.academic-stats {
    background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
    border-radius: 12px;
    padding: 32px;
    margin-top: 40px;
    border: 1px solid rgba(135, 206, 235, 0.3);
}

.academic-stats h3 {
    font-size: 20px;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 20px;
    text-align: center;
}

.academic-stats ul {
    list-style: none;
    max-width: 600px;
    margin: 0 auto;
}

.academic-stats li {
    padding: 8px 0;
    font-size: 16px;
    color: #4a5568;
    line-height: 1.6;
    position: relative;
    padding-left: 24px;
}

.academic-stats li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #87CEEB;
    font-weight: bold;
    font-size: 18px;
}

/* Wellness Benefits */
.wellness-benefits {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.wellness-item {
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.wellness-item h3 {
    font-size: 20px;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 16px;
    text-align: center;
}

.wellness-item p {
    font-size: 16px;
    color: #718096;
    margin: 0;
    line-height: 1.6;
}

/* Start Steps */
.start-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.step {
    background: white;
    padding: 30px 24px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    position: relative;
}

.step-number {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: #4a90e2;
    color: white;
    border-radius: 50%;
    line-height: 40px;
    font-weight: 600;
    font-size: 18px;
    margin-bottom: 16px;
}

.step h3 {
    font-size: 18px;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 12px;
}

.step p {
    font-size: 16px;
    color: #718096;
    margin: 0;
    line-height: 1.5;
}

/* Accessibility Note */
.accessibility-note {
    background: #f7fafc;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    padding: 30px;
    margin-top: 40px;
    text-align: center;
}

.accessibility-note h3 {
    font-size: 20px;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 16px;
}

.accessibility-note p {
    font-size: 16px;
    color: #718096;
    margin: auto;
    line-height: 1.6;
}

/* FAQ Section */
.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.faq-item {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border-top: 3px solid #4a90e2;
}

.faq-item h3 {
    font-size: 18px;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 12px;
    line-height: 1.4;
    text-align: center;
}

.faq-item p {
    font-size: 16px;
    color: #718096;
    margin: 0;
    line-height: 1.6;
}

/* Tablet - Optimize for tablet screens */
@media (max-width: 1024px) {
    .container {
        max-width: 800px;
        padding: 0 30px;
    }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .content-section {
        padding: 40px 0;
    }

    .content-section h2 {
        font-size: 24px;
        margin-bottom: 20px;
    }

    .content-section p {
        font-size: 16px;
    }

    .container {
        padding: 0 16px;
    }

    .benefits-grid,
    .features-list,
    .themes-grid,
    .student-scenarios,
    .wellness-benefits,
    .start-steps {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .faq-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .scroll-indicator {
        bottom: 80px; /* Moved up to avoid ad container overlap */
    }

    .scroll-text {
        font-size: 12px;
    }

    .scroll-arrow {
        font-size: 18px;
    }
}

/* Performance optimizations */
.content-sections {
    contain: layout style paint;
}

.content-section {
    contain: layout style;
}

/* Lazy loading animation */
.content-section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.content-section.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* Reduced motion accessibility */
@media (prefers-reduced-motion: reduce) {
    .scroll-indicator {
        animation: none;
    }

    .content-section {
        transition: none;
        opacity: 1;
        transform: none;
    }

    .loading-bubble {
        animation: none;
    }


}

/* High contrast mode */
@media (prefers-contrast: high) {

}

/* Focus styles for accessibility */

/* Prevent text selection and context menu on touch */
body {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}

/* Keep cursor visible for better user experience */
#bubbleCanvas:hover {
    cursor: crosshair;
}

/* Performance optimizations */
/* Ad container performance optimization commented out for AdSense approval */
.ui-controls /* , .ad-container */ {
    will-change: transform;
}

.loading-bubble {
    will-change: transform;
}

/* Privacy Notice */
.privacy-notice {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: white;
    z-index: 1000;
    padding: 12px 20px;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.privacy-notice.show {
    transform: translateY(0);
}

.privacy-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    gap: 20px;
}

.privacy-content p {
    margin: 0;
    font-size: 14px;
    opacity: 0.9;
}

.privacy-content a {
    color: #87CEEB;
    text-decoration: underline;
}

.privacy-content a:hover {
    color: #ADD8E6;
}

.privacy-button {
    background: #4a90e2;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.2s ease;
    flex-shrink: 0;
}

.privacy-button:hover {
    background: #357abd;
}

.privacy-button:focus {
    outline: 2px solid #87CEEB;
    outline-offset: 2px;
}

/* Mobile privacy notice */
@media (max-width: 768px) {
    .privacy-content {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }

    .privacy-content p {
        font-size: 13px;
    }

    .privacy-button {
        width: 100%;
        max-width: 200px;
    }
}

/* Print styles (hide interactive elements) */
@media print {
    .ui-controls,
    /* .ad-container, */
    .loading-screen,
    .privacy-notice {
        display: none;
    }
}
/* Mobile silent mode tip - hidden by default, shown only on mobile */
.mobile-silent-tip {
    display: none !important;
    font-size: 0.95rem !important;
    color: #e74c3c !important;
    margin-bottom: 20px !important;
    font-weight: 500 !important;
    text-align: center;
    background: rgba(231, 76, 60, 0.1);
    padding: 12px 16px;
    border-radius: 12px;
    border-left: 3px solid #e74c3c;
}

/* Global Footer Styles */
.footer {
    background: #2c3e50 !important;
    color: #ecf0f1;
    padding: 3rem 0 1rem 0;
    margin-top: 3rem;
    width: 100%;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: #ecf0f1;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #4a90e2;
}

.footer-section p {
    color: #bdc3c7;
    line-height: 1.6;
    margin-bottom: 0;
}

.footer-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

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

.footer-section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.2s ease;
    font-size: 0.9rem;
}

.footer-section ul li a:hover {
    color: #4a90e2;
}

.footer-section ul li a[target="_blank"]:after {
    content: " ↗";
    font-size: 0.8em;
    opacity: 0.7;
}

.footer-bottom {
    border-top: 1px solid #34495e;
    padding-top: 2rem;
    text-align: center;
}

.footer-bottom p {
    color: #95a5a6;
    font-size: 0.9rem;
    margin: 0;
}

/* Simple footer for minimal pages */
.simple-footer {
    background: #2c3e50 !important;
    color: #ecf0f1;
    padding: 2rem 0;
    margin-top: auto;
    width: 100%;
}

.simple-footer .footer-container {
    text-align: center;
}

.simple-footer .footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.simple-footer .footer-links a {
    color: #ecf0f1;
    text-decoration: none;
    transition: color 0.2s ease;
}

.simple-footer .footer-links a:hover {
    color: #4a90e2;
}

.simple-footer .footer-text {
    font-size: 0.9rem;
    color: #bdc3c7;
}

/* Footer responsive design */
@media (max-width: 768px) {
    .footer {
        padding: 2rem 0 1rem 0;
    }

    .footer-container {
        padding: 0 1rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .footer-section {
        text-align: center;
    }

    .simple-footer .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
}