:root {
    --bg-color: #000000;
    --text-main: #FFFFFF;
    --text-silver: #C0C0C0;
    --accent-glow: rgba(255, 255, 255, 0.2);
    --font-title: 'Cinzel', serif;
    --font-body: 'Times New Roman', serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-body);
    overflow: hidden;
    width: 100vw;
    height: 100vh;
}

#canvas3d {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

#webcam {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 160px;
    height: 120px;
    opacity: 0.3;
    border-radius: 8px;
    z-index: 10;
    transform: scaleX(-1); /* Mirror */
    border: 1px solid var(--text-silver);
}

#ui-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none; /* Let clicks pass through to canvas if needed, but buttons need pointer-events: auto */
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 40px;
}

header {
    text-align: center;
    margin-top: 20px;
    text-shadow: 0 0 10px rgba(255,255,255,0.5);
    pointer-events: auto;
}

.title {
    font-family: var(--font-title);
    font-size: 3rem;
    font-weight: 400;
    letter-spacing: 0.5em;
    color: var(--text-main);
    margin-bottom: 10px;
}

.subtitle {
    font-family: var(--font-title);
    font-size: 0.9rem;
    letter-spacing: 0.8em;
    color: var(--text-silver);
}

.controls {
    pointer-events: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    margin-bottom: 40px;
}

.upload-btn {
    cursor: pointer;
    background: transparent;
    border: 1px solid var(--text-silver);
    color: var(--text-silver);
    padding: 12px 30px;
    font-family: var(--font-title);
    font-size: 0.9rem;
    letter-spacing: 0.2em;
    transition: all 0.4s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.upload-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 15px var(--accent-glow);
    color: white;
    border-color: white;
}

.instructions {
    text-align: center;
    color: var(--text-silver);
    font-size: 0.8rem;
    letter-spacing: 0.1em;
    opacity: 0.7;
}

#camera-status {
    margin-top: 10px;
    font-size: 0.7rem;
    color: #555;
}

/* 手势控制面板 */
#gesture-panel {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.7);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    padding: 15px;
    z-index: 100;
    backdrop-filter: blur(10px);
    min-width: 200px;
}

.gesture-header {
    font-family: var(--font-title);
    font-size: 0.9rem;
    letter-spacing: 0.2em;
    color: var(--text-silver);
    text-align: center;
    padding-bottom: 10px;
    margin-bottom: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.gesture-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin-bottom: 15px;
}

.gesture-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 8px 4px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    transition: all 0.3s ease;
    cursor: default;
}

.gesture-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

.gesture-item.active {
    background: rgba(79, 195, 247, 0.3);
    border: 1px solid rgba(79, 195, 247, 0.5);
    transform: scale(1.05);
}

.gesture-icon {
    font-size: 1.4rem;
    margin-bottom: 4px;
}

.gesture-name {
    font-size: 0.65rem;
    color: var(--text-silver);
    text-align: center;
}

.gesture-desc {
    font-size: 0.55rem;
    color: rgba(255, 255, 255, 0.4);
    text-align: center;
}

.effects-status {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 10px;
}

.effect-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-silver);
    padding: 4px 0;
}

.effect-row span:last-child {
    color: #4fc3f7;
    font-family: monospace;
}