:root {
    --bg-dark: #050505;
    --blood-red: #8a0303;
    --crimson: #dc143c;
    --text-light: #f4f4f4;
    --glitch-cyan: #0ff;
    --glitch-red: #f00;
}

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

body, html {
    background-color: var(--bg-dark);
    color: var(--text-light);
    font-family: 'Oswald', sans-serif;
    overflow-x: hidden;
    scroll-behavior: smooth;
}

/* 屏幕噪点 */
#noise-overlay {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    pointer-events: none;
    background: 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)" opacity="0.08"/%3E%3C/svg%3E');
    z-index: 9999; /* 覆盖全局但不可点击 */
}

/* 首屏样式 */
.hero {
    height: 100vh;
    width: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    background: radial-gradient(circle at center, #1a0000 0%, var(--bg-dark) 100%);
}

.glitch-wrapper {
    position: relative;
    padding: 0 20px;
}

.glitch {
    font-size: clamp(4rem, 8vw, 10rem); /* 响应式字体大小 */
    font-weight: 700;
    text-transform: uppercase;
    position: relative;
    color: var(--text-light);
    letter-spacing: 5px;
    text-shadow: 0.05em 0 0 var(--blood-red), -0.025em -0.05em 0 rgba(0,0,0,0.5);
    animation: titleGlow 3s infinite alternate;
}

@keyframes titleGlow {
    0% { text-shadow: 0 0 10px rgba(138, 3, 3, 0.5), 0 0 20px rgba(138, 3, 3, 0.3); }
    100% { text-shadow: 0 0 20px rgba(220, 20, 60, 0.8), 0 0 40px rgba(220, 20, 60, 0.6); }
}

/* 故障伪元素 */
.glitch::before, .glitch::after {
    content: attr(data-text);
    position: absolute; top: 0; left: 0;
    width: 100%; height: 100%;
    background: transparent;
}

.glitch::before {
    left: 4px; text-shadow: -2px 0 var(--glitch-red);
    clip: rect(24px, 1550px, 90px, 0);
    animation: glitch-anim-2 2.5s infinite linear alternate-reverse;
}

.glitch::after {
    left: -4px; text-shadow: -2px 0 var(--glitch-cyan);
    clip: rect(85px, 1550px, 140px, 0);
    animation: glitch-anim 2s infinite linear alternate-reverse;
}

@keyframes glitch-anim {
    0% { clip: rect(15px, 9999px, 44px, 0); }
    20% { clip: rect(81px, 9999px, 14px, 0); }
    40% { clip: rect(32px, 9999px, 98px, 0); }
    60% { clip: rect(9px, 9999px, 34px, 0); }
    80% { clip: rect(65px, 9999px, 2px, 0); }
    100% { clip: rect(43px, 9999px, 55px, 0); }
}

@keyframes glitch-anim-2 {
    0% { clip: rect(65px, 9999px, 100px, 0); }
    20% { clip: rect(10px, 9999px, 80px, 0); }
    40% { clip: rect(89px, 9999px, 23px, 0); }
    60% { clip: rect(2px, 9999px, 67px, 0); }
    80% { clip: rect(45px, 9999px, 12px, 0); }
    100% { clip: rect(98px, 9999px, 34px, 0); }
}

.subtitle {
    font-family: 'Permanent Marker', cursive;
    font-size: clamp(1.5rem, 3vw, 2.5rem);
    margin: 1rem 0 3rem;
    color: var(--crimson);
    transform: rotate(-3deg);
}

/* 向下滚动提示 */
.scroll-down-prompt {
    position: absolute; bottom: 5vh; left: 50%;
    transform: translateX(-50%);
    display: flex; flex-direction: column; align-items: center;
    opacity: 0.8; animation: fadeInOut 2s infinite;
}

@keyframes fadeInOut { 0%, 100% { opacity: 0.2; } 50% { opacity: 0.9; } }

.scroll-arrow {
    width: 20px; height: 20px;
    border-bottom: 3px solid var(--text-light); border-right: 3px solid var(--text-light);
    transform: rotate(45deg); margin-top: 10px;
    animation: arrowBounce 1s infinite alternate;
}

@keyframes arrowBounce { 0% { transform: rotate(45deg) translateY(0); } 100% { transform: rotate(45deg) translateY(10px); } }

/* 视频区域 */
#video-section {
    min-height: 100vh;
    display: flex; justify-content: center; align-items: center;
    padding: 5vh 5vw;
    background: var(--bg-dark);
    opacity: 0;
    transform: translateY(100px);
    transition: opacity 1s ease-out, transform 1s cubic-bezier(0.2, 0.8, 0.2, 1);
}

#video-section.visible {
    opacity: 1;
    transform: translateY(0);
}

.video-outer-container {
    width: 100%;
    max-width: 1200px; /* 桌面端最大宽度 */
    aspect-ratio: 16 / 9; /* 关键：强制 16:9 比例，防止高度塌陷 */
    border: 4px solid var(--blood-red);
    position: relative; 
    background: #000;
    box-shadow: 0 20px 50px rgba(0,0,0,0.9), 0 0 40px rgba(138, 3, 3, 0.4);
}

/* 四角装饰 */
.video-outer-container::before, .video-outer-container::after {
    content: ''; position: absolute; width: 40px; height: 40px;
    border: 4px solid var(--text-light); z-index: 2;
}
.video-outer-container::before { top: -10px; left: -10px; border-right: none; border-bottom: none; }
.video-outer-container::after { bottom: -10px; right: -10px; border-left: none; border-top: none; }

.video-container {
    position: relative; width: 100%; height: 100%; overflow: hidden;
}

video {
    width: 100%; height: 100%; 
    object-fit: contain; /* 保证画面完整 */
    display: block; position: relative; z-index: 10; 
}

.video-glitch-overlay {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(to bottom, transparent 50%, rgba(138, 3, 3, 0.1) 50%);
    background-size: 100% 4px; opacity: 0.15; z-index: 20;
    pointer-events: none; /* 穿透点击 */
}

/* 错误提示 */
#video-error-msg {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    background: rgba(138, 3, 3, 0.95); color: #fff;
    padding: 15px 20px; text-align: center; z-index: 30; 
    border: 2px solid #fff; font-size: 1rem;
    width: 90%; max-width: 400px;
}
#video-error-msg.hidden { display: none; }

/* 移动端专属微调 */
@media (max-width: 768px) {
    .video-outer-container {
        border-width: 2px;
        width: 100%;
        box-shadow: 0 10px 30px rgba(0,0,0,0.9), 0 0 20px rgba(138, 3, 3, 0.4);
    }
    .video-outer-container::before, .video-outer-container::after {
        width: 20px; height: 20px; border-width: 2px;
        top: -5px; left: -5px;
    }
    .video-outer-container::after {
        bottom: -5px; right: -5px;
    }
    #video-section { padding: 0 5vw; }
}