/* THE GATE - 样式设计 */

:root {
    --bg-color: #050203;
    --neon-red: #e50914;
    --neon-red-glow: rgba(229, 9, 20, 0.8);
    --neon-red-dim: rgba(229, 9, 20, 0.2);
    --panel-bg: rgba(10, 5, 6, 0.75);
    --panel-border: rgba(229, 9, 20, 0.4);
    --text-color: #f5f5f7;
    --font-title: 'Oswald', sans-serif;
    --font-mono: 'Courier Prime', monospace;
}

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

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

/* 经典模拟噪点叠加层 */
#noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(rgba(0, 0, 0, 0) 60%, rgba(0, 0, 0, 0.9)),
                      url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.08;
    z-index: 10;
    pointer-events: none;
    animation: grain 0.5s steps(10) infinite;
}

@keyframes grain {
    0%, 100% { transform:translate(0, 0); }
    10% { transform:translate(-1%, -1%); }
    20% { transform:translate(-2%, 1%); }
    30% { transform:translate(1%, -2%); }
    40% { transform:translate(-1%, 3%); }
    50% { transform:translate(-2%, 1%); }
    60% { transform:translate(1%, 2%); }
    70% { transform:translate(3%, -2%); }
    80% { transform:translate(-2%, 1%); }
    90% { transform:translate(1%, -3%); }
}

/* 霓虹标题区域 */
.neon-header {
    position: absolute;
    top: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 5;
    text-align: center;
    pointer-events: none;
    width: 90%;
    max-width: 600px;
}

.main-title {
    font-family: var(--font-title);
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: 12px;
    color: #000;
    text-shadow: 
        -1px -1px 0 var(--neon-red),  
         1px -1px 0 var(--neon-red),
        -1px  1px 0 var(--neon-red),
         1px  1px 0 var(--neon-red),
         0 0 10px var(--neon-red-glow),
         0 0 25px rgba(229, 9, 20, 0.6);
    text-transform: uppercase;
    animation: flicker-light 3s infinite alternate;
}

.subtitle {
    font-size: 0.9rem;
    color: #a0a0a5;
    letter-spacing: 4px;
    margin-top: 5px;
    text-transform: uppercase;
    text-shadow: 0 0 5px rgba(0, 0, 0, 0.8);
}

/* WebGL 容器 */
#canvas-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

/* 交互提示 */
.interactive-hint {
    position: absolute;
    bottom: 125px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 5;
    pointer-events: none;
    text-align: center;
    color: #808085;
    font-size: 0.85rem;
    letter-spacing: 2px;
    animation: breathe 3s infinite ease-in-out;
}

@keyframes breathe {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.8; color: #b08085; }
}

/* 控制面板 */
.control-panel {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 6;
    display: flex;
    gap: 15px;
    padding: 12px 25px;
    background: var(--panel-bg);
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8),
                inset 0 0 15px rgba(229, 9, 20, 0.15);
}

/* 霓虹按钮 */
.neon-btn {
    font-family: var(--font-mono);
    background: transparent;
    color: #dfa9ac;
    border: 1px solid rgba(229, 9, 20, 0.5);
    padding: 10px 20px;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 1.5px;
    cursor: pointer;
    border-radius: 2px;
    transition: all 0.3s ease;
    outline: none;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    gap: 6px;
}

.neon-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transition: 0.5s;
}

.neon-btn:hover::before {
    left: 100%;
}

.neon-btn:hover {
    color: #ffffff;
    background: rgba(229, 9, 20, 0.2);
    border-color: var(--neon-red);
    box-shadow: 0 0 12px var(--neon-red-glow),
                inset 0 0 4px var(--neon-red-glow);
    text-shadow: 0 0 5px #fff;
}

.neon-btn:active {
    transform: scale(0.95);
    background: rgba(229, 9, 20, 0.35);
}

/* 手势激活状态 */
.neon-btn.active {
    color: #ffffff;
    background: rgba(229, 9, 20, 0.4);
    border-color: #ff3333;
    box-shadow: 0 0 15px var(--neon-red-glow), inset 0 0 8px #ff3333;
    text-shadow: 0 0 8px #fff;
    animation: pulse-button 1.5s infinite alternate;
}

@keyframes pulse-button {
    0% { box-shadow: 0 0 8px var(--neon-red-glow), inset 0 0 4px #ff3333; }
    100% { box-shadow: 0 0 18px var(--neon-red-glow), inset 0 0 10px #ff3333; }
}

/* 摄像头视频渲染小窗 */
#webcam-container {
    position: absolute;
    bottom: 120px;
    right: 30px;
    width: 160px;
    height: 138px;
    z-index: 10;
    background: rgba(5, 2, 3, 0.85);
    border: 1px solid var(--neon-red);
    border-radius: 4px;
    padding: 3px;
    box-shadow: 0 0 15px var(--neon-red-glow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#webcam {
    display: none; /* 隐藏原生摄像头，只用 canvas 画镜像和手骨 */
}

#webcam-canvas {
    width: 154px;
    height: 114px;
    border-radius: 2px;
    background: #000;
}

.webcam-label {
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--neon-red);
    letter-spacing: 2px;
    text-align: center;
    margin-top: 4px;
    text-shadow: 0 0 3px var(--neon-red-glow);
    animation: flicker-light 4s infinite alternate;
}

/* 霓虹闪烁动画 */
@keyframes flicker-light {
    0%, 19%, 21%, 23%, 25%, 54%, 56%, 100% {
        text-shadow: 
            -1px -1px 0 var(--neon-red),  
             1px -1px 0 var(--neon-red),
            -1px  1px 0 var(--neon-red),
             1px  1px 0 var(--neon-red),
             0 0 10px var(--neon-red-glow),
             0 0 25px rgba(229, 9, 20, 0.6);
        opacity: 1;
    }
    20%, 24%, 55% {
        text-shadow: none;
        opacity: 0.7;
    }
}

/* Loading 遮罩层 */
#loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000;
    z-index: 100;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 1s ease, transform 1s ease;
}

#loading-overlay.fade-out {
    opacity: 0;
    pointer-events: none;
    transform: scale(1.05);
}

.loading-content {
    text-align: center;
    width: 80%;
    max-width: 400px;
}

.loading-logo {
    font-family: var(--font-title);
    font-size: 4rem;
    font-weight: 700;
    letter-spacing: 15px;
    color: var(--neon-red);
    text-shadow: 0 0 15px var(--neon-red-glow);
    margin-bottom: 40px;
    animation: pulse-glow 2s infinite ease-in-out;
}

.loading-bar-container {
    width: 100%;
    height: 3px;
    background: #111;
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 20px;
    box-shadow: 0 0 8px rgba(0, 0, 0, 0.5);
}

#loading-bar {
    width: 0%;
    height: 100%;
    background: var(--neon-red);
    box-shadow: 0 0 10px var(--neon-red-glow);
    transition: width 0.3s ease;
}

.loading-text {
    font-size: 0.8rem;
    color: #606065;
    letter-spacing: 2px;
    text-transform: uppercase;
}

@keyframes pulse-glow {
    0%, 100% {
        transform: scale(1);
        text-shadow: 0 0 15px var(--neon-red-glow);
    }
    50% {
        transform: scale(1.02);
        text-shadow: 0 0 30px var(--neon-red-glow), 0 0 10px var(--neon-red);
    }
}

/* 响应式调整 */
@media (max-width: 768px) {
    .main-title {
        font-size: 2.2rem;
        letter-spacing: 5px;
    }
    .loading-logo {
        font-size: 2.5rem;
        letter-spacing: 6px;
    }
    .control-panel {
        bottom: 20px;
        padding: 8px 15px;
        gap: 8px;
        width: 95%;
        justify-content: center;
        flex-wrap: wrap;
    }
    .neon-btn {
        padding: 8px 12px;
        font-size: 0.75rem;
        letter-spacing: 1px;
    }
    .interactive-hint {
        bottom: 155px;
        font-size: 0.75rem;
    }
    #webcam-container {
        bottom: 215px;
        right: 50%;
        transform: translateX(50%);
    }
}