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

html, body {
    height: 100%;
    font-family: system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    color: #e8e8e8;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-width: 480px;
    margin: 0 auto;
}

#header {
    padding: 20px 20px 10px;
    text-align: center;
}

#sound-name {
    font-size: 1.5rem;
    font-weight: 600;
    color: #4facfe;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#status {
    font-size: 0.85rem;
    color: #888;
    min-height: 1.2em;
}

#compass-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

#compass {
    width: min(70vw, 280px);
    height: min(70vw, 280px);
    border-radius: 50%;
    background: radial-gradient(circle, rgba(79, 172, 254, 0.1) 0%, transparent 70%);
    border: 2px solid rgba(79, 172, 254, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

#compass::before {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    background: #4facfe;
    border-radius: 50%;
}

#arrow {
    width: 60%;
    height: 60%;
    transition: transform 0.15s ease-out;
}

#arrow polygon {
    fill: #4facfe;
}

#distance {
    margin-top: 24px;
    font-size: 2.5rem;
    font-weight: 700;
    color: #fff;
}

#distance::after {
    content: ' m';
    font-size: 1.2rem;
    font-weight: 400;
    color: #888;
}

#distance.no-unit::after {
    content: '';
}

#controls {
    position: absolute;
    top: 20px;
    right: 20px;
}

.toggle-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    color: #888;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.toggle-btn .icon {
    font-size: 1.5rem;
}

.toggle-btn.active {
    background: rgba(79, 172, 254, 0.2);
    border-color: rgba(79, 172, 254, 0.5);
    color: #4facfe;
}

#play-btn {
    position: fixed;
    top: 20px;
    left: 20px;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    border: none;
    border-radius: 20px;
    cursor: pointer;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(79, 172, 254, 0.4);
    transition: all 0.2s;
}

#play-btn:active {
    transform: scale(0.96);
}

#play-btn.playing {
    background: linear-gradient(135deg, #f5576c 0%, #f093fb 100%);
    box-shadow: 0 4px 20px rgba(245, 87, 108, 0.4);
}

#sound-list {
    padding: 12px;
    max-height: 35vh;
    overflow-y: auto;
    background: rgba(0, 0, 0, 0.2);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.sound-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.sound-item:last-child {
    margin-bottom: 0;
}

.sound-item:active {
    transform: scale(0.98);
}

.sound-item.selected {
    background: rgba(79, 172, 254, 0.2);
    border: 1px solid rgba(79, 172, 254, 0.4);
}

.sound-item .indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #555;
    flex-shrink: 0;
}

.sound-item.selected .indicator {
    background: #4facfe;
    box-shadow: 0 0 8px rgba(79, 172, 254, 0.6);
}

.sound-item .info {
    flex: 1;
    min-width: 0;
}

.sound-item .name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sound-item .dist {
    font-size: 0.85rem;
    color: #888;
}

.sound-item .direction {
    font-size: 1.2rem;
    color: #666;
    width: 24px;
    text-align: center;
}

@media (min-height: 700px) {
    #sound-list {
        max-height: 40vh;
    }
}

@media (prefers-color-scheme: light) {
    html, body {
        background: linear-gradient(135deg, #e8f4f8 0%, #d4e8f2 50%, #c0dcea 100%);
        color: #1a1a2e;
    }

    #sound-name { color: #0066cc; }
    #distance { color: #1a1a2e; }

    #compass {
        background: radial-gradient(circle, rgba(0, 102, 204, 0.08) 0%, transparent 70%);
        border-color: rgba(0, 102, 204, 0.25);
    }

    #compass::before { background: #0066cc; }
    #arrow polygon { fill: #0066cc; }

    .toggle-btn {
        background: rgba(0, 0, 0, 0.05);
        border-color: rgba(0, 0, 0, 0.1);
    }

    .toggle-btn.active {
        background: rgba(0, 102, 204, 0.15);
        border-color: rgba(0, 102, 204, 0.4);
        color: #0066cc;
    }

    #sound-list {
        background: rgba(255, 255, 255, 0.5);
        border-color: rgba(0, 0, 0, 0.1);
    }

    .sound-item { background: rgba(255, 255, 255, 0.7); }

    .sound-item.selected {
        background: rgba(0, 102, 204, 0.15);
        border-color: rgba(0, 102, 204, 0.3);
    }

    .sound-item.selected .indicator {
        background: #0066cc;
        box-shadow: 0 0 8px rgba(0, 102, 204, 0.4);
    }
}