/* CRT 屏幕效果 & 胶片噪点 */
.crt-overlay::before {
    content: " ";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background:
        /* 扫描线 */
        linear-gradient(
            rgba(18, 16, 16, 0) 50%,
            rgba(0, 0, 0, 0.25) 50%
        ),
        /* RGB 色差 */
        linear-gradient(
            90deg,
            rgba(255, 0, 0, 0.06),
            rgba(0, 255, 0, 0.02),
            rgba(0, 0, 255, 0.06)
        );
    z-index: 10;
    background-size: 100% 2px, 3px 100%;
    pointer-events: none;
}

/* 动态噪点层 - 模拟低保真画质 */
.crt-overlay::after {
    content: "";
    position: absolute;
    top: -150%;
    left: -50%;
    width: 300%;
    height: 300%;
    background-image: url('data:image/svg+xml;utf8,%3Csvg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg"%3E%3Cfilter id="noiseFilter"%3E%3CfeTurbulence type="fractalNoise" baseFrequency="0.85" numOctaves="3" stitchTiles="stitch"/%3E%3C/filter%3E%3Crect width="100%25" height="100%25" filter="url(%23noiseFilter)" opacity="0.05"/%3E%3C/svg%3E');
    animation: noise-shift 0.2s infinite;
    pointer-events: none;
    z-index: 1; /* 在背景之上，内容之下 */
    opacity: 0.4;
    mix-blend-mode: overlay;
}

/* Level 3 电火花闪烁 */
@keyframes flash-burst {
    0%, 90% { background-color: transparent; opacity: 0; }
    92% { background-color: #fff; opacity: 0.8; }
    94% { background-color: #fff; opacity: 0.1; }
    96% { background-color: transparent; opacity: 0; }
    98% { background-color: #fff; opacity: 0.5; }
    100% { background-color: transparent; opacity: 0; }
}

.flash-active #crt-container::after {
    content: " ";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 20;
    pointer-events: none;
    animation: flash-burst 5s infinite; /* 5秒一次随机闪烁 */
    mix-blend-mode: screen;
}

@keyframes noise-shift {
    0% { transform: translate(0, 0); }
    10% { transform: translate(-5%, -5%); }
    20% { transform: translate(-10%, 5%); }
    30% { transform: translate(5%, -10%); }
    40% { transform: translate(-5%, 15%); }
    50% { transform: translate(-10%, 5%); }
    60% { transform: translate(15%, 0); }
    70% { transform: translate(0, 10%); }
    80% { transform: translate(-15%, 0); }
    90% { transform: translate(10%, 5%); }
    100% { transform: translate(5%, 0); }
}

.crt-overlay {
    animation: flicker 0.15s infinite;
}

/* 屏幕扫描线动画 */
.scanline {
    width: 100%;
    height: 100px;
    z-index: 10;
    background: linear-gradient(0deg, rgba(0,0,0,0) 0%, var(--scanline-color) 50%, rgba(0,0,0,0) 100%);
    opacity: 0.1;
    position: absolute;
    bottom: 100%;
    animation: scanline 10s linear infinite;
    pointer-events: none;
}

@keyframes scanline {
    0% { bottom: 100%; }
    100% { bottom: -100px; }
}

@keyframes flicker {
    0% { opacity: 0.97; }
    5% { opacity: 0.95; }
    10% { opacity: 0.9; }
    15% { opacity: 0.95; }
    20% { opacity: 0.99; }
    25% { opacity: 0.95; }
    30% { opacity: 0.9; }
    35% { opacity: 0.96; }
    40% { opacity: 0.98; }
    45% { opacity: 0.95; }
    50% { opacity: 0.99; }
    55% { opacity: 0.93; }
    60% { opacity: 0.9; }
    65% { opacity: 0.96; }
    70% { opacity: 1; }
    75% { opacity: 0.97; }
    80% { opacity: 0.95; }
    85% { opacity: 0.92; }
    90% { opacity: 0.96; }
    95% { opacity: 0.99; }
    100% { opacity: 0.94; }
}

/* 文字辉光与色差 */
body {
    text-shadow: 0 0 2px #C8C8C8;
}

/* 故障文字效果 */
.glitch {
    position: relative;
    color: var(--text-color);
}

.glitch::before,
.glitch::after {
    content: attr(data-text);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-color);
}

.glitch::before {
    left: 2px;
    text-shadow: -1px 0 #ff00c1;
    clip: rect(44px, 450px, 56px, 0);
    animation: glitch-anim-1 5s infinite linear alternate-reverse;
}

.glitch::after {
    left: -2px;
    text-shadow: -1px 0 #00fff9;
    clip: rect(44px, 450px, 56px, 0);
    animation: glitch-anim-2 5s infinite linear alternate-reverse;
}

@keyframes glitch-anim-1 {
    0% { clip: rect(30px, 9999px, 10px, 0); }
    20% { clip: rect(50px, 9999px, 60px, 0); }
    40% { clip: rect(20px, 9999px, 80px, 0); }
    60% { clip: rect(80px, 9999px, 30px, 0); }
    80% { clip: rect(10px, 9999px, 40px, 0); }
    100% { clip: rect(60px, 9999px, 20px, 0); }
}

@keyframes glitch-anim-2 {
    0% { clip: rect(10px, 9999px, 80px, 0); }
    20% { clip: rect(80px, 9999px, 10px, 0); }
    40% { clip: rect(40px, 9999px, 60px, 0); }
    60% { clip: rect(20px, 9999px, 30px, 0); }
    80% { clip: rect(60px, 9999px, 20px, 0); }
    100% { clip: rect(30px, 9999px, 90px, 0); }
}

/* 切入特效时的屏幕扭曲 */
.noclip-active #crt-container {
    filter: hue-rotate(90deg) invert(100%);
    transform: scale(1.05) skewX(2deg);
    transition: all 0.1s;
}

/* Level 2 热浪视效 (性能优化版) */
@keyframes heat-pulse-opacity {
    0% { opacity: 0.3; }
    50% { opacity: 0.7; }
    100% { opacity: 0.3; }
}

.heat-active #crt-container::after {
    content: " ";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 5;
    pointer-events: none;
    /* 使用静态渐变替代昂贵的 box-shadow 模糊计算 */
    background: radial-gradient(circle, transparent 60%, rgba(255, 50, 0, 0.4) 100%);
    /* 动画仅改变透明度，GPU 开销极低 */
    animation: heat-pulse-opacity 2s infinite ease-in-out;
    mix-blend-mode: overlay;
}

/* =========================================
   ASCII 迷宫行走特效 (ASCII Walk Effect)
   ========================================= */

#ascii-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 5;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.1s;
    
    /* ASCII 字体设置 */
    font-family: 'Courier New', Courier, monospace;
    font-size: 12px;
    line-height: 12px;
    color: var(--text-color);
    text-align: center;
    white-space: pre;
    overflow: hidden;
    
    display: flex;
    flex-direction: column;
    justify-content: flex-end; /* 从底部向上滚动 */
}

#ascii-overlay.active {
    opacity: 1;
}

#ascii-overlay.insane {
    color: #ff3333;
    text-shadow: 2px 0 #fff;
}