@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;500;800&display=swap');
.footer-notice {
    width: 20%;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 15px 0;
    text-align: center;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer-notice p {
    margin: 0;
}
:root {
    --bg-dark: #050505;
    --glass: rgba(255, 255, 255, 0.03);
    --border: rgba(255, 255, 255, 0.08);
    --text-main: #ffffff;
    --accent: #00f0ff; /* 赛博青色 */
    --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
    background: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Inter', sans-serif;
    overflow: hidden; /* 隐藏默认滚动条，完全接管滚动 */
    height: 100vh;
    width: 100vw;
    /* 噪点纹理背景 */
    background-image: 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='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.07'/%3E%3C/svg%3E"),
    radial-gradient(circle at 20% 50%, #1a1a2e 0%, #000 70%);
}

/* --- 横向滚动容器 --- */
.scroll-container {
    display: flex;
    height: 100vh;
    width: 400vw; /* 4个屏幕的宽度 */
    will-change: transform;
}

section {
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    flex-shrink: 0;
    padding: 0 5vw;
}

/* --- 导航箭头样式 --- */
.nav-arrow {
    position: absolute;
    right: 30px;
    top: 50%;
    transform: translateY(-50%);
    width: 60px;
    height: 60px;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 10;
    backdrop-filter: blur(10px);
    transition: 0.3s var(--ease);
    color: var(--text-main);
}

.nav-arrow:hover {
    background: var(--accent);
    color: #000;
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
}

/* 最后一页隐藏箭头 */
section:last-child .nav-arrow {
    display: none;
}

/* --- 第一屏：HERO --- */
.hero-content {
    z-index: 2;
    mix-blend-mode: exclusion;
}

h1 {
    font-size: 12vw;
    font-weight: 800;
    line-height: 0.8;
    letter-spacing: -5px;
    margin-bottom: 40px;
    background: linear-gradient(to right, #fff, #888);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    opacity: 0;
    animation: slideUp 1s var(--ease) 0.5s forwards;
}

.hero-btns {
    display: flex;
    gap: 20px;
    opacity: 0;
    animation: slideUp 1s var(--ease) 0.8s forwards;
}

.btn {
    padding: 15px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: 0.3s var(--ease);
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
    text-transform: uppercase;
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background: var(--text-main);
    color: #000;
}
.btn-primary:hover { box-shadow: 0 0 30px rgba(255,255,255,0.4); transform: scale(1.05); }

.btn-glass {
    background: var(--glass);
    color: #fff;
}
.btn-glass:hover { background: rgba(255,255,255,0.1); border-color: #fff; }

.bg-deco-orb {
    position: absolute; right: 10%; top: 20%; width: 400px; height: 400px; background: radial-gradient(circle, rgba(0,240,255,0.1) 0%, transparent 60%); filter: blur(50px); z-index: -1;
}

/* --- 第二屏：视觉展示 (3D Tilt) --- */
.visual-wrapper {
    display: flex;
    gap: 50px;
    perspective: 1000px; /* 3D透视 */
}

.tilt-card {
    width: 40vw;
    max-width: 800px;
    aspect-ratio: 950/700;
    border-radius: 20px;
    background: #000;
    border: 1px solid var(--border);
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.1s; /* 实时跟随鼠标 */
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}

.tilt-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 20px;
    opacity: 0.8;
    transition: 0.5s;
    /* 防止图片拖拽 */
    user-select: none; 
    -webkit-user-drag: none;
}

.tilt-card:hover img { opacity: 1; }

.card-label {
    position: absolute;
    bottom: -30px;
    left: 0;
    font-family: monospace;
    color: var(--border);
}

/* --- 第三屏：教程 (Protocol) --- */
.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    width: 100%;
}

.step-card {
    background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(255,255,255,0.01));
    backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 40px;
    position: relative;
    overflow: hidden;
    transition: 0.4s var(--ease);
}

.step-card:hover {
    transform: translateY(-10px);
    border-color: rgba(255,255,255,0.3);
    background: linear-gradient(145deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
}

.step-num {
    font-size: 5rem;
    font-weight: 800;
    color: rgba(255,255,255,0.03);
    position: absolute;
    top: 10px;
    right: 20px;
    line-height: 1;
}

.step-title {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.step-text {
    font-size: 0.95rem;
    line-height: 1.8;
    color: #ccc;
    text-align: justify;
}

.highlight {
    color: #fff;
    font-weight: bold;
    background: rgba(255,255,255,0.1);
    padding: 0 4px;
    border-radius: 4px;
}

/* --- 底部进度条 --- */
.progress-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    height: 4px;
    background: var(--accent);
    width: 0%;
    z-index: 100;
    box-shadow: 0 0 10px var(--accent);
}

.scroll-hint {
    position: fixed;
    bottom: 40px;
    right: 40px;
    font-family: monospace;
    color: var(--text-main);
    mix-blend-mode: difference;
    animation: pulse 2s infinite;
    z-index: 90;
}

@keyframes slideUp {
    from { transform: translateY(100px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}
@keyframes pulse { 0%,100% { opacity: 0.5; } 50% { opacity: 1; } }

/* 移动端适配 */
@media (max-width: 768px) {
    body { overflow-y: auto; overflow-x: hidden; height: auto; }
    .scroll-container { flex-direction: column; width: 100vw; height: auto; transform: none !important; }
    section { height: auto; min-height: 100vh; padding: 80px 20px; }
    h1 { font-size: 20vw; }
    .hero-btns { flex-direction: column; width: 100%; }
    .visual-wrapper { flex-direction: column; gap: 80px; }
    .tilt-card { width: 100%; }
    .tutorial-grid { grid-template-columns: 1fr; }
    .progress-bar, .scroll-hint, .nav-arrow { display: none; } /* 移动端隐藏箭头和提示 */
}