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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: #0a0a0a;
    touch-action: none;
    font-family: -apple-system, BlinkMacSystemFont, sans-serif;
}

#canvas-container {
    width: 100%;
    height: 100%;
}

#controls {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    z-index: 100;
}

.btn-row {
    display: flex;
    gap: 8px;
    padding: 6px;
    background: rgba(0,0,0,0.4);
    border-radius: 20px;
    backdrop-filter: blur(12px);
}

.btn {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.1);
    background: transparent;
    color: rgba(255,255,255,0.5);
    font-size: 13px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.btn:active {
    transform: scale(0.92);
    background: rgba(255,255,255,0.08);
}

.btn.active {
    background: rgba(255,255,255,0.12);
    border-color: rgba(255,255,255,0.25);
    color: #fff;
}

.mode-selector {
    display: flex;
    gap: 4px;
    padding: 4px;
    background: rgba(0,0,0,0.3);
    border-radius: 12px;
    backdrop-filter: blur(8px);
}

.mode-btn {
    padding: 6px 12px;
    border-radius: 8px;
    border: none;
    background: transparent;
    color: rgba(255,255,255,0.4);
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mode-btn.active {
    background: rgba(255,255,255,0.15);
    color: #fff;
}

#sensor-overlay {
    position: fixed;
    top: 20px;
    left: 20px;
    right: 20px;
    z-index: 100;
    pointer-events: none;
}

#sensor-status {
    display: inline-block;
    padding: 8px 14px;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(8px);
    border-radius: 8px;
    color: rgba(255,255,255,0.6);
    font-size: 12px;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

#sensor-data {
    font-family: 'SF Mono', Monaco, monospace;
    font-size: 11px;
    color: rgba(255,255,255,0.4);
    line-height: 1.6;
    opacity: 0;
    transition: opacity 0.3s;
}

#sensor-data.active {
    opacity: 1;
}

#start-prompt {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 200;
    transition: opacity 0.4s, visibility 0.4s;
}

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

#start-prompt h1 {
    color: #fff;
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}

#start-prompt p {
    color: rgba(255,255,255,0.5);
    font-size: 14px;
    margin-bottom: 28px;
    text-align: center;
    padding: 0 40px;
}

#start-btn {
    padding: 14px 32px;
    background: #fff;
    color: #000;
    border: none;
    border-radius: 24px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
}

#start-btn:active {
    transform: scale(0.96);
    opacity: 0.8;
}

#loading {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: rgba(255,255,255,0.4);
    font-size: 13px;
    pointer-events: none;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.axis-label {
    display: inline-block;
    width: 14px;
    color: #ff6b6b;
}

.axis-label.y { color: #4ade80; }
.axis-label.z { color: #60a5fa; }

#model-source {
    position: fixed;
    bottom: 10px;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 10px;
    color: rgba(255,255,255,0.2);
    pointer-events: auto;
    z-index: 100;
}

#model-source a {
    color: rgba(255,255,255,0.3);
    text-decoration: none;
    transition: color 0.2s;
}

#model-source a:hover {
    color: rgba(255,255,255,0.5);
}

#repo-link {
    position: fixed;
    bottom: 14px;
    right: 14px;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    color: rgba(255,255,255,0.35);
    text-decoration: none;
    transition: color 0.2s, opacity 0.2s;
    opacity: 0.7;
}

#repo-link:hover {
    color: rgba(255,255,255,0.6);
    opacity: 1;
}

#repo-link svg {
    width: 20px;
    height: 20px;
    fill: #fff;
}