*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.85);
    --bg-glass-dark: rgba(0, 0, 0, 0.75);
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --accent: #0a0a0a;
    --accent-hover: #333333;
    --border: rgba(0, 0, 0, 0.1);
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.15);
}

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
}

/* Splash Screen */
.splash-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease-in-out, visibility 0.5s ease-in-out;
}

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

.splash-content {
    text-align: center;
    max-width: 400px;
    padding: 40px;
}

.splash-content h1.title {
    font-size: 48px;
    font-weight: 300;
    letter-spacing: -2px;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #000, #333);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.splash-content p.subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.splash-content p.instruction {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.primary-btn {
    padding: 16px 32px;
    font-size: 16px;
    font-family: inherit;
    font-weight: 500;
    color: white;
    background: var(--accent);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease-in-out;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    background: var(--accent-hover);
}

#app {
    width: 100%;
    height: 100%;
    position: relative;
}

/* Main Three.js canvas - in front of waveform */
.renderer-canvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: crosshair;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
}

/* Waveform canvas - behind the blob, vertically centered */
#waveformCanvas {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    width: 100%;
    height: 100px;
    pointer-events: none;
    z-index: 1;
}

/* Controls Panel */
#controls {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    z-index: 100;
    transition: opacity 0.3s ease-in-out, transform 0.3s ease-in-out;
}

#controls.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(20px);
    pointer-events: none;
}

.control-divider {
    width: 1px;
    height: 24px;
    background: var(--border);
    margin: 0 4px;
}

.control-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.control-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    border-color: rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
}

.control-btn.primary {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.control-btn.primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.control-btn.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.3);
}

.control-btn.icon-only {
    padding: 12px;
}

.control-btn svg {
    flex-shrink: 0;
}

/* Settings Panel */
.settings-panel {
    position: fixed;
    top: 50%;
    right: 24px;
    transform: translateY(-50%) translateX(120%);
    width: 320px;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    z-index: 200;
    opacity: 0;
    transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out;
}

.settings-panel.open {
    transform: translateY(-50%) translateX(0);
    opacity: 1;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.settings-header h3 {
    font-size: 16px;
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-secondary);
    line-height: 1;
    padding: 0;
    transition: color 0.2s ease-in-out;
}

.close-btn:hover {
    color: var(--text-primary);
}

.settings-content {
    padding: 16px 20px;
}

.setting-group {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    gap: 12px;
}

.setting-group:last-child {
    margin-bottom: 0;
}

.setting-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    min-width: 80px;
}

.setting-group input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--border);
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
}

.setting-group input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    transition: transform 0.2s ease-in-out;
}

.setting-group input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.setting-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--accent);
    cursor: pointer;
}

.setting-group select {
    flex: 1;
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 12px;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    padding-right: 28px;
}

.setting-group select:hover {
    border-color: rgba(0, 0, 0, 0.2);
}

.setting-group select:focus {
    outline: none;
    border-color: var(--accent);
}

.setting-group span {
    font-size: 12px;
    color: var(--text-secondary);
    min-width: 32px;
    text-align: right;
}

.settings-footer {
    padding: 12px 20px;
    border-top: 1px solid var(--border);
}

.reset-btn {
    width: 100%;
    padding: 10px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 10px;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.reset-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-primary);
}

/* Keyboard Hints */
.keyboard-hints {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 16px;
    padding: 8px 16px;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 12px;
    border: 1px solid var(--border);
    font-size: 11px;
    color: var(--text-secondary);
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
    z-index: 50;
    pointer-events: none;
}

.keyboard-hints.visible {
    opacity: 1;
}

.keyboard-hints span {
    white-space: nowrap;
}

/* Status indicator */
#status {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    padding: 10px 20px;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 30px;
    border: 1px solid var(--border);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
    z-index: 100;
}

#status.visible {
    opacity: 1;
}

/* Floating Show Button */
.floating-show-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    transform: scale(0.8);
    pointer-events: none;
    transition: all 0.3s ease-in-out;
    z-index: 100;
    box-shadow: var(--shadow);
}

.floating-show-btn.visible {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
}

.floating-show-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    transform: scale(1.1);
    box-shadow: var(--shadow-hover);
}

.floating-show-btn svg {
    color: var(--text-primary);
}

/* Global UI Hide Mode */
body.ui-hidden #controls,
body.ui-hidden #settingsPanel,
body.ui-hidden #keyboardHints,
body.ui-hidden #status {
    opacity: 0 !important;
    pointer-events: none !important;
    transition: opacity 0.4s ease;
}

body.ui-hidden .floating-show-btn {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
}

/* Fullscreen mode adjustments */
:fullscreen #controls,
:-webkit-full-screen #controls {
    bottom: 40px;
}

/* Responsive */
@media (max-width: 600px) {
    #controls {
        bottom: 20px;
        padding: 12px 16px;
        gap: 8px;
    }

    .control-btn {
        padding: 10px 14px;
        font-size: 13px;
    }

    .control-btn span {
        display: none;
    }

    .control-btn.icon-only {
        padding: 10px;
    }

    .settings-panel {
        right: 12px;
        left: 12px;
        width: auto;
    }

    .keyboard-hints {
        display: none;
    }

    .control-divider {
        display: none;
    }
}