/* === Global Reset & Typography === */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --font-main: 'Futura', 'Avenir Next', 'Helvetica Neue', sans-serif;
    --text-light: #FFFFFF;
    --text-light-muted: rgba(255, 255, 255, 0.65);
    --text-dark: #0A1628;
    --text-dark-muted: #5C6A7A;
    --border-color: rgba(10, 22, 40, 0.15);
}

body, html {
    width: 100%; 
    font-family: var(--font-main);
    background-color: #060D18;
    overflow-x: clip; 
}

/* === 0. Loading Screen === */
#loader-screen {
    position: fixed; top: 0; left: 0; width: 100%; height: 100vh;
    background-color: #060D18; z-index: 9999;
    display: flex; flex-direction: column; justify-content: center; align-items: center;
    transition: opacity 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}
.loader-box { width: 300px; }
.loader-text { 
    color: #8BA8C9; font-size: 0.75rem; letter-spacing: 0.3em; 
    margin-bottom: 20px; text-transform: uppercase; display: flex; justify-content: space-between;
}
.loader-text span:first-child::before {
    content: ''; display: inline-block; width: 6px; height: 6px; 
    background: #8BA8C9; border-radius: 50%; margin-right: 10px;
    box-shadow: 0 0 10px #8BA8C9; animation: blink 1s infinite;
}
.loader-bar-bg { width: 100%; height: 1px; background: rgba(255,255,255,0.1); position: relative; }
.loader-bar-fill { height: 100%; width: 0%; background: #8BA8C9; box-shadow: 0 0 15px #8BA8C9; transition: width 0.1s linear; }

/* === 1. Fixed Background Layers === */
.fixed-bg-container { position: fixed; top: 0; left: 0; width: 100%; height: 100vh; z-index: 0; pointer-events: none; }
.ambient-glow { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background-image: radial-gradient(circle at 15% 60%, rgba(26, 52, 84, 0.9) 0%, transparent 60%), radial-gradient(circle at 85% 20%, rgba(96, 144, 184, 0.6) 0%, transparent 55%); filter: blur(40px); opacity: 0.9; }
#canvas-container { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }

/* === 2. Hero Section === */
.hero-section { position: relative; width: 100%; height: 100vh; z-index: 10; padding: 50px 60px; display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: auto 1fr auto; background: linear-gradient(to bottom, rgba(6, 13, 24, 0) 60%, rgba(6, 13, 24, 1) 100%); pointer-events: none; }
.hero-group { grid-column: 1 / 2; grid-row: 1 / 2; pointer-events: auto; }
.sub-theme { color: var(--text-light-muted); font-size: 0.85rem; font-weight: 400; letter-spacing: 0.4em; margin-bottom: 20px; text-transform: uppercase; }
.main-title { color: var(--text-light); font-size: clamp(3rem, 5vw, 6rem); font-weight: 200; letter-spacing: 0.8em; line-height: 1.2; margin-bottom: 30px; text-shadow: 0 10px 40px rgba(0,0,0,0.3); }
.description { color: var(--text-light-muted); font-size: 1rem; font-weight: 300; letter-spacing: 0.1em; line-height: 1.8; max-width: 400px; }
.location-block { grid-column: 2 / 3; grid-row: 1 / 4; justify-self: end; color: var(--text-light); font-size: 0.9rem; font-weight: 200; letter-spacing: 0.8em; writing-mode: vertical-rl; opacity: 0.85; pointer-events: auto; }
.info-block { position: absolute; bottom: 50px; right: 120px; text-align: right; z-index: 15; pointer-events: auto; }
.date { color: var(--text-light); font-size: 1.5rem; font-weight: 300; letter-spacing: 0.2em; margin-bottom: 5px; }
.scroll-hint { color: var(--text-light-muted); font-size: 0.7rem; letter-spacing: 0.2em; text-transform: uppercase; animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 0.5; } 50% { opacity: 1; } }
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }

/* === 3. Stacking Cards === */
.stacking-container { position: relative; z-index: 20; }
.card-section { position: sticky; top: 0; min-height: 100vh; display: flex; flex-direction: column; justify-content: center; padding: 80px 60px; box-shadow: 0 -20px 50px rgba(0,0,0,0.4); border-top: 1px solid rgba(255, 255, 255, 0.05); overflow: hidden; }

.card-1 { z-index: 21; background: linear-gradient(180deg, #060D18 0%, #162842 100%); color: var(--text-light); justify-content: flex-start; padding: 0; position: relative; }
.card-2 { z-index: 22; background: linear-gradient(180deg, #162842 0%, #3A5472 100%); color: var(--text-light); }
.card-3 { z-index: 23; background: linear-gradient(180deg, #3A5472 0%, #5A7A9A 100%); color: var(--text-light); }
.card-4 { z-index: 24; background: linear-gradient(180deg, #5A7A9A 0%, #8A9CAE 100%); color: var(--text-light); }
.card-5 { z-index: 25; background: linear-gradient(180deg, #8A9CAE 0%, #B8C9D6 100%); color: var(--text-dark); }
.card-6 { z-index: 26; background: linear-gradient(180deg, #B8C9D6 0%, #EAEFF4 100%); color: var(--text-dark); box-shadow: 0 -20px 50px rgba(0,0,0,0.15); }

.section-header { margin-bottom: 60px; text-align: center; width: 100%; }
.section-title { font-size: 2.5rem; font-weight: 200; letter-spacing: 0.4em; text-transform: uppercase; margin-bottom: 20px; }
.section-subtitle { font-size: 1rem; letter-spacing: 0.1em; font-weight: 300; }
.card-1 .section-header { padding: 80px 60px 0; }
.card-1 .section-subtitle { color: var(--text-light-muted); }

.card-2 .artwork-artist, .card-2 .artwork-details, .card-3 .artwork-artist, .card-3 .artwork-details, .card-4 .artwork-artist, .card-4 .artwork-details { color: var(--text-light-muted); }
.card-5 .artwork-artist, .card-5 .artwork-details, .card-6 .artwork-artist, .card-6 .artwork-details { color: var(--text-dark-muted); }

/* Blueprint Layout */
.layout-interactive-container { width: 100%; height: 100vh; position: relative; display: flex; align-items: center; justify-content: center; }
#layout-3d-canvas { position: absolute; top: 0; left: 0; width: 100%; height: 100%; cursor: crosshair; }
#layout-3d-canvas canvas { pointer-events: auto; }
.layout-hud { position: absolute; bottom: 80px; left: 60px; width: 420px; padding: 40px; background: rgba(10, 22, 40, 0.45); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px); border: 1px solid rgba(255, 255, 255, 0.08); border-radius: 2px; pointer-events: none; transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1); }
.hud-marker { font-size: 0.65rem; letter-spacing: 0.3em; color: #8BA8C9; margin-bottom: 20px; display: flex; align-items: center; gap: 8px; }
.hud-marker::before { content: ''; width: 6px; height: 6px; background: #8BA8C9; border-radius: 50%; box-shadow: 0 0 10px #8BA8C9; animation: blink 2s infinite; }
.hud-id { font-size: 0.8rem; letter-spacing: 0.2em; color: var(--text-light-muted); margin-bottom: 10px; }
#hud-title { font-size: 2rem; font-weight: 300; letter-spacing: 0.15em; margin-bottom: 20px; color: #FFF; text-transform: uppercase; }
#hud-desc { font-size: 1rem; line-height: 1.8; font-weight: 300; color: rgba(255,255,255,0.7); }

/* === FULL-SCREEN BORDERLESS ARTWORK CONTAINERS === */
.artwork-container { 
    display: flex; 
    align-items: center; 
    justify-content: flex-end; 
    max-width: 1600px; 
    margin: 0 auto; 
    width: 100%; 
    height: 100%;
    z-index: 10;
    pointer-events: none; 
}

.card-3 .artwork-container, .card-5 .artwork-container { 
    justify-content: flex-start; 
    flex-direction: row; 
}

.artwork-visual { 
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent; 
    border: none; 
    box-shadow: none; 
    pointer-events: none; 
    margin: 0; 
    z-index: 1; 
}
.artwork-visual canvas { 
    pointer-events: auto; 
    cursor: grab; 
    width: 100% !important; 
    height: 100% !important; 
    display: block; 
}

.artwork-info { 
    width: 40%;
    min-width: 350px;
    max-width: 500px;
    z-index: 15; 
    padding: 0 40px;
    pointer-events: auto; 
    background: transparent;
}

.artwork-artist { font-size: 0.9rem; letter-spacing: 0.2em; margin-bottom: 10px; text-transform: uppercase; }
.artwork-name { font-size: 2.2rem; font-weight: 300; letter-spacing: 0.1em; margin-bottom: 30px; }
.artwork-details { font-size: 1rem; line-height: 1.8; font-weight: 300; margin-bottom: 40px; }

.btn-outline { display: inline-block; padding: 12px 30px; border: 1px solid var(--text-light); color: var(--text-light); text-decoration: none; font-size: 0.8rem; letter-spacing: 0.2em; text-transform: uppercase; transition: all 0.3s ease; }
.btn-outline:hover { background-color: var(--text-light); color: #060D18; }
.card-5 .btn-outline, .card-6 .btn-outline { border-color: var(--text-dark); color: var(--text-dark); }
.card-5 .btn-outline:hover, .card-6 .btn-outline:hover { background-color: var(--text-dark); color: #FFF; }

/* === Dynamic Crowd Layers (Updated for Local SVG & Scale) === */
.crowd-container {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 40vh; 
    pointer-events: none;
    z-index: 6; 
    overflow: hidden;
    mix-blend-mode: overlay; 
    opacity: 0.85;
}

.crowd-figure {
    position: absolute;
    bottom: -20px; 
    transform-origin: bottom center;
    will-change: transform, opacity;
    
    /* 核心：使用 CSS Mask 载入本地 SVG */
    -webkit-mask-image: url('./figure.svg');
    -webkit-mask-size: contain;
    -webkit-mask-position: bottom center;
    -webkit-mask-repeat: no-repeat;
    mask-image: url('./figure.svg');
    mask-size: contain;
    mask-position: bottom center;
    mask-repeat: no-repeat;
}

/* 通过背景色来赋予 SVG 遮罩渐变质感 */
.figure-light {
    background: linear-gradient(to top, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0) 100%);
}
.figure-dark {
    background: linear-gradient(to top, rgba(10,22,40,0.95) 0%, rgba(10,22,40,0) 100%);
}

/* 赋予人物左右移动和 Z 轴深度（缩放）的变化 */
@keyframes roam {
    0% { 
        transform: translateX(var(--move-left)) scale(var(--scale-min)); 
        opacity: 0.3; 
    }
    50% { 
        opacity: 1; 
    }
    100% { 
        transform: translateX(var(--move-right)) scale(var(--scale-max)); 
        opacity: 0.3; 
    }
}

/* === Elastic Footer === */
.site-footer { position: relative; z-index: 27; height: 120vh; background: linear-gradient(180deg, rgba(255,255,255,0) 0%, rgba(255,255,255,0.95) 25%, #FFFFFF 35%, #FFFFFF 100%); pointer-events: none; }
.footer-content { position: absolute; bottom: 0; width: 100%; padding: 0 60px 60px 60px; color: var(--text-dark); pointer-events: auto; will-change: transform; }
.footer-end-mark { margin: 0 auto 60px auto; width: 1px; height: 60px; background-color: var(--text-dark-muted); opacity: 0.3; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; max-width: 1400px; margin: 0 auto 60px auto; padding-bottom: 60px; border-bottom: 1px solid var(--border-color); }
.footer-col h4 { font-size: 0.75rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--text-dark); margin-bottom: 20px; font-weight: 500; }
.footer-col p, .footer-col li { font-size: 0.95rem; color: var(--text-dark-muted); line-height: 1.8; font-weight: 300; list-style: none; }
.footer-col a { color: var(--text-dark-muted); text-decoration: none; transition: color 0.3s ease; }
.footer-col a:hover { color: var(--text-dark); }
.brand-col .footer-title { font-size: 1.5rem; letter-spacing: 0.3em; font-weight: 300; margin-bottom: 15px; }

.newsletter-form { display: flex; margin-top: 10px; border-bottom: 1px solid var(--text-dark-muted); }
.newsletter-form input { flex: 1; background: transparent; border: none; padding: 10px 0; color: var(--text-dark); font-size: 0.9rem; font-family: inherit; outline: none; }
.newsletter-form input::placeholder { color: var(--text-dark-muted); opacity: 0.6; }
.newsletter-form button { background: transparent; border: none; color: var(--text-dark); font-size: 0.8rem; letter-spacing: 0.1em; text-transform: uppercase; cursor: pointer; padding: 10px; transition: opacity 0.3s; }
.newsletter-form button:hover { opacity: 0.6; }

.footer-bottom { display: flex; justify-content: space-between; align-items: center; max-width: 1400px; margin: 0 auto; }
.footer-copyright { font-size: 0.75rem; letter-spacing: 0.15em; font-weight: 400; color: var(--text-dark-muted); }
.footer-socials { display: flex; gap: 20px; font-size: 0.8rem; letter-spacing: 0.1em; }
.footer-socials a { color: var(--text-dark); text-decoration: none; transition: opacity 0.3s; }
.footer-socials a:hover { opacity: 0.5; }
.elastic-bumper { height: 35vh; background: #FFFFFF; position: relative; z-index: 27; }

/* Responsive adjustments */
@media (max-width: 1024px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 60px; } }
@media (max-width: 768px) {
    .hero-section { padding: 30px 20px; display: block; pointer-events: none;}
    .main-title { font-size: 2.5rem; letter-spacing: 0.4em; }
    .description, .info-block { display: none; }
    .location-block { position: absolute; top: 30px; right: 20px; font-size: 0.7rem; pointer-events: auto;}
    
    .card-section { min-height: 100vh; padding: 0; position: relative; overflow: hidden; }
    .layout-hud { left: 20px; bottom: 40px; width: calc(100% - 40px); padding: 25px; z-index: 20; }
    
    .artwork-container, .card-3 .artwork-container, .card-4 .artwork-container, .card-5 .artwork-container, .card-6 .artwork-container { 
        flex-direction: column; 
        justify-content: flex-end; 
        padding: 40px 20px;
        height: 100vh; 
    }
    
    .artwork-info { 
        width: 100%; 
        max-width: 100%; 
        padding: 25px; 
        background: rgba(6, 13, 24, 0.65); 
        backdrop-filter: blur(12px); 
        border-radius: 8px;
        border: 1px solid rgba(255,255,255,0.08);
    }

    .card-5 .artwork-info, .card-6 .artwork-info {
        background: rgba(255, 255, 255, 0.65);
        border: 1px solid rgba(0,0,0,0.08);
    }
    
    .site-footer { height: auto; background: #FFFFFF; pointer-events: auto; }
    .footer-content { position: relative; padding: 60px 20px 40px 20px; }
    .footer-grid { grid-template-columns: 1fr; gap: 40px; }
    .footer-bottom { flex-direction: column; gap: 20px; text-align: center; }
    .elastic-bumper { display: none; }
}