:root{--bg:#000000;--bg-alt:#000000;--bg-card:#000000;--text:#ffffff;--text-muted:#888888;--accent:#ffffff;--accent2:#ffffff;--border:#333333;--font-h:'Cormorant Garamond',serif;--font-b:'Outfit',sans-serif}
[data-theme="light"]{--bg:#ffffff;--bg-alt:#ffffff;--bg-card:#ffffff;--text:#000000;--text-muted:#666666;--border:#cccccc;--accent:#000000;--accent2:#000000}
*{margin:0;padding:0;box-sizing:border-box}
html {
    scroll-behavior: smooth;
}
html, body {
    width: 100%;
    overflow-x: hidden;
    position: relative;
    -webkit-text-size-adjust: 100%;
    touch-action: pan-y;
}
body{font-family:var(--font-b);background:var(--bg);color:var(--text);line-height:1.7;transition:background .8s,color .8s}
a{text-decoration:none;color:inherit}
ul{list-style:none}
img{max-width:100%;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
.section{padding:100px 0}
.alt-bg{background:var(--bg-alt)}
.text-center{text-align:center}
.section-label{display:inline-block;font-size:.85rem;text-transform:uppercase;letter-spacing:3px;color:var(--accent);margin-bottom:10px;font-weight:600}
.section-title{font-family:var(--font-h);font-size:2.5rem;font-weight:400;margin-bottom:15px;letter-spacing:1px;text-transform:uppercase}
.section-desc{color:var(--text-muted);font-size:1.1rem;max-width:600px;margin:0 auto 50px}
/* Logo visibility */
[data-theme="dark"] .logo-light,[data-theme="light"] .logo-dark{display:none!important}
[data-theme="dark"] .logo-dark,[data-theme="light"] .logo-light{display:block!important}
/* Preloader */
.preloader{position:fixed;top:0;left:0;width:100%;height:100%;background:var(--bg);z-index:9999;display:flex;align-items:center;justify-content:center;transition:opacity .5s;overflow:hidden}
.preloader.hide{opacity:0;pointer-events:none}
.preloader-inner{width:100%;height:100%;display:flex;justify-content:center;align-items:center;padding:20px}
.preloader-logo{height:auto;max-height:250px;width:auto;max-width:80%;object-fit:contain;animation:pulse 2s infinite;opacity:0.8}
/* Header */
.header{position:fixed;top:0;left:0;width:100%;z-index:100;padding:15px 0;transition:all .3s}
.header.scrolled{background:rgba(0,0,0,.95);backdrop-filter:blur(12px);box-shadow:0 2px 20px rgba(0,0,0,.3)}
[data-theme="light"] .header.scrolled{background:rgba(255,255,255,.95)}
.header-inner{max-width:1400px;margin:0 auto;padding:0 30px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;height:80px}
@media (max-width: 992px) {
    .header-inner { display: flex; justify-content: space-between; padding: 0 20px; }
    .header-center { display: none; }
}
.logo{display:flex;align-items:center;height:100%}
.logo-img{height:100%;max-height:40px;width:auto;object-fit:contain}
.header-center{display:flex;align-items:center;justify-content:center;gap:20px}
.header-center-logo{height:40px;width:auto;object-fit:contain;opacity:0.9;transition:opacity .4s}
.header-center-logo:hover{opacity:1}
.header-divider{color:var(--border);font-weight:300;font-size:1.5rem;margin:0 5px}
.header-right{display:flex;align-items:center;justify-content:flex-end;gap:20px}
.navbar{display:flex;gap:25px}
.nav-link{font-size:.85rem;font-weight:400;text-transform:uppercase;letter-spacing:2px;position:relative;transition:opacity .3s;opacity:0.7;white-space:nowrap}
.nav-link:hover{opacity:1;color:var(--text)}
.header-actions{display:flex;align-items:center;gap:12px}
.theme-toggle{background:none;border:1px solid var(--border);color:var(--text);width:38px;height:38px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:1.1rem;transition:all .3s}
.theme-toggle:hover{border-color:var(--accent);color:var(--accent)}
[data-theme="dark"] .theme-icon-dark{display:none}
[data-theme="light"] .theme-icon-light{display:none}
.btn-catalog{display:flex;align-items:center;gap:6px;padding:8px 16px;border:1px solid var(--accent);color:var(--accent);border-radius:30px;font-size:.85rem;font-weight:500;transition:all .3s}
.btn-catalog:hover{background:var(--accent);color:var(--bg)}
.menu-toggle{display:none;background:none;border:none;cursor:pointer;flex-direction:column;gap:5px;padding:5px}
.menu-toggle span{display:block;width:25px;height:2px;background:var(--text);transition:all .3s}
.menu-toggle.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.menu-toggle.active span:nth-child(2){opacity:0}
.menu-toggle.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}
/* Buttons */
.btn{display:inline-flex;align-items:center;gap:10px;padding:12px 30px;border-radius:0;font-weight:500;letter-spacing:1px;text-transform:uppercase;cursor:pointer;transition:all .4s;border:1px solid transparent;font-size:.9rem}
.btn-primary{background:var(--text);color:var(--bg)}
.btn-primary:hover{background:transparent;color:var(--text);border-color:var(--text)}
.btn-outline{background:transparent;color:var(--text);border-color:var(--text)}
.btn-outline:hover{background:var(--text);color:var(--bg)}
.btn-sm{padding:10px 20px;font-size:.9rem}
.btn-full{width:100%;justify-content:center}
/* Hero */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden;background:var(--bg)}
.hero-content{position:relative;z-index:2;max-width:1000px;padding:0 20px;display:flex;flex-direction:column;align-items:center}
.hero-logos-wrap{display:flex;align-items:center;justify-content:center;gap:3vw;margin-bottom:60px;width:100%;flex-wrap:wrap}
.hero-text-logo{height:12vw;max-height:100px;width:auto;object-fit:contain}
.purify-hero{height:6vw;max-height:60px}
.hero-divider{color:var(--text);font-size:4vw;font-weight:100;line-height:1}
.hero-actions{display:flex;gap:20px;justify-content:center;flex-wrap:wrap}
.hero-scroll{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);z-index:2}
.hero-scroll a{color:rgba(255,255,255,.5);font-size:2rem;animation:bounce 2s infinite;transition:color .4s}
@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(10px)}}
/* Removed light theme hero gradients for pure white aesthetic */
[data-theme="light"] .hero-subtitle{color:#555}
[data-theme="light"] .hero-scroll a{color:rgba(0,0,0,.3)}
/* Animations */
.fade-up{opacity:0;transform:translateY(30px);animation:fadeUp 1s forwards}.d1{animation-delay:.2s}.d2{animation-delay:.4s}.d3{animation-delay:.6s}
@keyframes fadeUp{to{opacity:1;transform:translateY(0)}}
.reveal,.reveal-left,.reveal-right{opacity:0;transition:all .8s ease}
.reveal{transform:translateY(40px)}.reveal-left{transform:translateX(-50px)}.reveal-right{transform:translateX(50px)}
.reveal.visible,.reveal-left.visible,.reveal-right.visible{opacity:1;transform:translate(0)}
/* About */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.about-text p{color:var(--text-muted);margin-bottom:18px;font-size:1.05rem}
.about-text strong{color:var(--text)}
.umbrella-brand{margin-top:30px;padding-top:20px;border-top:1px solid var(--border);display:flex;align-items:center;gap:12px}
.umbrella-brand span{font-size:.85rem;text-transform:uppercase;letter-spacing:1px;color:var(--text-muted)}
.yldrms-inline-logo{height:24px;width:auto;object-fit:contain}
.about-image{position:relative}
.about-image img{border-radius:8px;box-shadow:0 20px 40px rgba(0,0,0,.4)}
.about-badge{position:absolute;bottom:-30px;right:-30px;background:var(--text);color:var(--bg);width:140px;height:140px;border-radius:0;display:flex;flex-direction:column;align-items:center;justify-content:center;border:1px solid var(--bg);text-align:center;padding:10px}
.badge-number{display:block;font-family:var(--font-h);font-size:2.5rem;font-weight:700;line-height:1;margin-bottom:5px}
.badge-text{font-size:.8rem;text-transform:uppercase;letter-spacing:1px;line-height:1.2;display:block}
/* Stats */
.stats{background:var(--bg);border-top:1px solid var(--border);border-bottom:1px solid var(--border);padding:80px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;text-align:center}
.stat-item i{font-size:2rem;margin-bottom:10px}
.stat-number{font-family:var(--font-h);font-size:3rem;font-weight:700}
.stat-suffix{font-family:var(--font-h);font-size:1.5rem;font-weight:700}
.stat-item p{font-size:.9rem;text-transform:uppercase;letter-spacing:1px}
/* Features */
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;margin-top:50px}
.feature-card{background:transparent;border:1px solid var(--border);border-radius:0;padding:50px 30px;text-align:center;transition:all .5s cubic-bezier(0.25, 0.46, 0.45, 0.94)}
.feature-card:hover{border-color:var(--text)}
.feature-icon{width:60px;height:60px;margin:0 auto 20px;border-radius:0;background:var(--bg-alt);display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:var(--text)}
.feature-card h3{font-family:var(--font-h);font-size:1.3rem;margin-bottom:10px;text-transform:uppercase}
.feature-card p{color:var(--text-muted);font-size:.95rem}
/* Brands */
.brands-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:50px}
.brand-card{background:transparent;border:1px solid var(--border);border-radius:0;padding:40px 30px;text-align:center;transition:all .5s cubic-bezier(0.25, 0.46, 0.45, 0.94)}
.brand-card:hover{border-color:var(--text)}
.purify-card:hover{border-color:var(--text)}
.brand-logo-wrap{height:80px;display:flex;align-items:center;justify-content:center;margin-bottom:20px}
.brand-logo{max-height:75px;width:auto;object-fit:contain}
.purify-card .brand-logo{max-height:45px}
.brand-card h3{font-family:var(--font-h);font-size:1.6rem;margin-bottom:12px}
.brand-card p{color:var(--text-muted);margin-bottom:20px}
.brand-link{color:var(--accent);font-weight:500;display:inline-flex;align-items:center;gap:5px;transition:gap .3s}
.brand-link:hover{gap:10px}
.brand-link.purify{color:var(--accent2)}
/* Purify Showcase */
.purify-showcase{padding:100px 0;background:var(--bg)}
.purify-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.purify-image img{border-radius:0}
.purify-section-logo{height:50px;width:auto;object-fit:contain;margin-bottom:20px}
.purify-title{color:var(--accent2)!important}
.purify-text p{color:var(--text-muted);margin-bottom:25px;font-size:1.05rem}
.purify-features{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.purify-features li{display:flex;align-items:center;gap:12px;font-size:.95rem;text-transform:uppercase;letter-spacing:1px}
.purify-features i{color:var(--text);font-size:1.2rem}
/* Section Dividers (Slogans) */
.slogan-divider{padding:50px 0;text-align:center;background:var(--bg);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.slogan-divider-img{max-height:45px;width:100%;max-width:800px;object-fit:contain;margin:0 auto;display:block}
/* Products */
.catalog-download-bar{display:flex;align-items:center;justify-content:space-between;background:transparent;border:1px solid var(--border);border-radius:0;padding:20px 30px;margin-bottom:40px;flex-wrap:wrap;gap:15px}
.catalog-download-bar p{display:flex;align-items:center;gap:10px;color:var(--text-muted);font-size:.95rem;text-transform:uppercase;letter-spacing:1px}

.flipbook-loader{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-family:var(--font-h);font-size:1.5rem;color:var(--accent);letter-spacing:2px;animation:pulse 1.5s infinite}
@keyframes pulse{0%,100%{opacity:.5}50%{opacity:1}}
.flipbook{display:none;transition:transform 0.6s cubic-bezier(0.4, 0, 0.2, 1)}
.flipbook.ready{display:block;margin:0 auto;box-shadow:0 0 20px rgba(0,0,0,0.5)}
.flipbook.centered{transform:translateX(-25%)}
.catalog-hint{position:absolute;bottom:40px;right:40px;z-index:10;display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--accent);pointer-events:none;opacity:0;transition:opacity 0.5s}
.catalog-hint.visible{opacity:1;animation:hintBounce 2s infinite}
.catalog-hint i{font-size:2rem}
.catalog-hint span{font-size:.8rem;text-transform:uppercase;letter-spacing:1px;font-weight:600}
@keyframes hintBounce{0%,100%{transform:translateX(0)}50%{transform:translateX(-15px)}}
.page{background-color:#fff;background-size:100% 100%;border:1px solid #ddd;overflow:hidden}
.page-img{width:100%;height:100%;object-fit:cover;display:block;pointer-events:none;user-select:none}
.page.--left{border-right:0;box-shadow:inset -7px 0 30px -7px rgba(0,0,0,0.4)}
.page.--right{border-left:0;box-shadow:inset 7px 0 30px -7px rgba(0,0,0,0.4)}
/* ============ Engineering / Exploded View ============ */
/* ============ Scroll Intro ============ */
/* ============ Scroll Intro ============ */
.scroll-intro {
    position: relative;
    height: 100vh;
    background: var(--bg);
}

.intro-sticky {
    position: sticky;
    top: 0;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.intro-sticky {
    position: sticky;
    top: 0;
    height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    transition: background 0.8s ease;
}

/* Branding */
.intro-branding-wrap {
    position: relative;
    z-index: 10;
    width: 100%;
}

.intro-branding {
    text-align: center;
    width: 100%;
}

.intro-logo-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 60px;
}

.intro-hero-logo {
    height: clamp(120px, 20vw, 250px);
    width: auto;
    margin-bottom: 0;
    transition: transform 0.8s ease;
}

.intro-hero-slogan {
    font-family: var(--font-b);
    font-size: clamp(0.9rem, 1.5vw, 1.2rem);
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 12px;
    color: var(--text-muted);
    max-width: 900px;
    margin: 40px auto 80px;
    line-height: 1.5;
    transition: opacity 0.4s ease;
}

@media (max-width: 768px) {
    .intro-hero-slogan {
        letter-spacing: 4px !important;
        font-size: 0.85rem;
        margin: 20px auto 40px;
        padding: 0 15px;
    }
    .intro-hero-logo {
        height: clamp(80px, 30vw, 150px);
    }
    .about-badge {
        right: 0 !important;
        bottom: 0 !important;
        width: 100px !important;
        height: 100px !important;
    }
    .badge-number {
        font-size: 1.8rem !important;
    }
}

.intro-explore {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 3px;
}

.explore-mouse {
    width: 26px;
    height: 44px;
    border: 2px solid var(--border);
    border-radius: 15px;
    position: relative;
}

.explore-mouse::after {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--accent);
    border-radius: 2px;
    animation: scroll-mouse 2s infinite;
}

@keyframes scroll-mouse {
    0% { opacity: 0; transform: translate(-50%, 0); }
    30% { opacity: 1; }
    100% { opacity: 0; transform: translate(-50%, 15px); }
}

/* Scroll-Driven Transforms (Controlled by main.js updating --scroll-p) */
/* The new photographic intro uses --scroll-p directly in .intro-hero-img and .intro-main-title */

/* About Section Transition */
/* Production Report Flipbook ============ */
.production-report {
    padding: 100px 0;
}

.flipbook-wrapper, .report-wrapper {
    position: relative;
    width: 100%;
    max-width: 1100px;
    margin: 40px auto 80px;
    min-height: 500px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--border);
    padding: 30px;
    border-radius: 0;
}

.report-flipbook {
    box-shadow: 0 30px 60px rgba(0,0,0,0.3);
}

.report-page-content {
    padding: 60px;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background: #f8f9fa;
    color: #1a1a1a;
}

.report-page-content h3, .report-page-content h4 {
    font-family: var(--font-h);
    margin-bottom: 20px;
}

.report-logo {
    width: 60px;
    margin-top: 40px;
}

[data-theme="dark"] .report-page-content {
    background: #121212;
    color: #eee;
}

@media(max-width:992px){
    .intro-grid { grid-template-columns: 1fr; text-align: center; }
    .intro-visual { height: 50vh; }
    .scroll-intro { height: 100vh; }
    .intro-desc { margin: 0 auto 40px; }
    .scroll-hint { margin: 0 auto; }
}
/* Contact */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;margin-top:50px}
.contact-card{background:var(--bg-card);backdrop-filter:blur(10px);border:1px solid var(--border);border-radius:8px;padding:25px;margin-bottom:15px;display:flex;align-items:center;gap:20px;transition:border-color .4s;overflow:hidden}
.contact-card:hover{border-color:var(--accent)}
.contact-card i{font-size:1.8rem;color:var(--accent);flex-shrink:0}
.contact-card-content{flex:1;min-width:0}
.contact-card h4{font-size:1rem;margin-bottom:3px;text-transform:uppercase;letter-spacing:1px}
.contact-card p{color:var(--text-muted);font-size:.9rem;word-break:break-word;overflow-wrap:break-word}
.social-links{display:flex;gap:12px;margin-top:20px}
.social-links a{width:42px;height:42px;border-radius:50%;border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:1.3rem;transition:all .3s}
.social-links a:hover{background:var(--accent);color:#0a0a0a;border-color:var(--accent)}
.contact-form{display:flex;flex-direction:column;gap:15px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:15px}
.contact-form input,.contact-form textarea{width:100%;padding:14px 16px;background:var(--bg-card);border:1px solid var(--border);border-radius:6px;color:var(--text);font-family:var(--font-b);font-size:.95rem;transition:border-color .3s}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--accent)}
/* Footer */
.footer{background:var(--bg-alt);border-top:1px solid var(--border);padding:60px 0 0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.5fr;gap:40px}
.footer-logo{height:28px;margin-bottom:15px}
.footer-col p{color:var(--text-muted);font-size:.9rem}
.footer-col h4{font-family:var(--font-h);font-size:1.2rem;margin-bottom:15px;color:var(--accent)}
.footer-col ul li{margin-bottom:8px}
.footer-col ul li a,.footer-col ul li{color:var(--text-muted);font-size:.9rem;transition:color .3s;display:flex;align-items:center;gap:8px}
.footer-col ul li a:hover{color:var(--accent)}
.footer-socials{display:flex;gap:10px;margin-top:15px}
.footer-socials a{width:36px;height:36px;border-radius:50%;border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:1.1rem;color:var(--text-muted);transition:all .3s}
.footer-socials a:hover{background:var(--accent);color:#0a0a0a;border-color:var(--accent)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding:25px 0;margin-top:40px;border-top:1px solid var(--border);color:var(--text-muted);font-size:.85rem;flex-wrap:wrap;gap:10px}
.footer-umbrella{display:flex;align-items:center;gap:12px}
/* Scroll Top */
.scroll-top{position:fixed;bottom:30px;right:30px;width:50px;height:50px;background:var(--text);color:var(--bg);border-radius:0;display:flex;align-items:center;justify-content:center;font-size:1.5rem;opacity:0;pointer-events:none;transition:all .4s;z-index:99}
.scroll-top.show{opacity:1;transform:translateY(0);pointer-events:auto}
.scroll-top:hover{background:#c4a030;transform:translateY(-3px)}
.menu-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.7);backdrop-filter:blur(5px);z-index:98;opacity:0;pointer-events:none;transition:opacity .4s ease}
.menu-overlay.active{opacity:1;pointer-events:auto}
/* Responsive */
@media(max-width:992px){
.navbar{position:fixed;top:0;right:-300px;width:280px;height:100vh;background:var(--bg);flex-direction:column;padding:80px 30px 30px;gap:20px;transition:right .3s;box-shadow:-5px 0 20px rgba(0,0,0,.3);z-index:99}
.navbar.open{right:0}
.menu-toggle{display:flex}
.about-grid,.brands-grid,.contact-grid,.purify-grid,.footer-grid{grid-template-columns:1fr}
.stats-grid{grid-template-columns:repeat(2,1fr)}
.features-grid{grid-template-columns:repeat(2,1fr)}
.hero-title{font-size:3rem}
.section-title{font-size:2rem}
.section{padding: 60px 0}
.header-right{gap: 10px}
.header-actions{gap: 8px}
.btn-catalog{padding: 8px 12px}
}
@media(max-width:576px){
.hero-title{font-size:2.2rem}
.hero-subtitle{font-size:1.1rem}
.hero-text-logo{height:16vw;min-height:45px}
.purify-hero{height:8vw;min-height:25px}
.stats-grid,.features-grid{grid-template-columns:1fr}
.form-row{grid-template-columns:1fr}
.btn-catalog span{display:none}
.footer-bottom{flex-direction:column;text-align:center}
.purify-features{grid-template-columns:1fr}
.slogan-divider-img{max-height:25px}
.contact-form .btn-primary{padding:18px;font-size:1rem;letter-spacing:2px}
.menu-toggle.active span:nth-child(1){transform:rotate(-45deg) translate(-5px, 6px);width:15px}
.menu-toggle.active span:nth-child(2){width:25px}
.menu-toggle.active span:nth-child(3){transform:rotate(45deg) translate(-5px, -6px);width:15px}
.flipbook, .report-flipbook { height: 400px !important; }
.catalog-download-bar .btn { min-width: 100%; }
}


.flipbook {
    width: 100%;
    max-width: 900px; /* Spread width */
    height: 600px; /* Standardized height */
    margin: 0 auto !important;
    opacity: 0;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.8s ease;
    cursor: grab;
    display: flex;
    justify-content: center;
    align-items: center;
    transform: translateX(0);
}

.flipbook.centered {
    transform: translateX(-25%);
}

@media(max-width: 900px) {
    .flipbook.centered {
        transform: translateX(0);
    }
}

/* Ensure the library's internal elements are centered */
.flipbook > div, .flipbook canvas {
    margin: 0 auto !important;
}

.flipbook:active {
    cursor: grabbing;
}

.flipbook.ready {
    opacity: 1;
}

.flipbook-loader {
    padding: 60px;
    font-family: var(--font-h);
    font-size: 1.1rem;
    color: var(--accent);
    text-align: center;
    letter-spacing: 1px;
}

.flip-hint {
    position: absolute;
    top: 50%;
    right: calc(50% - 350px); /* Positioned to the right of the centered cover */
    transform: translateY(-50%);
    z-index: 50;
    pointer-events: none;
    opacity: 0;
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    background: var(--text); /* Opposite of theme background */
    color: var(--bg); /* Opposite of theme text */
    padding: 20px;
    border-radius: 50%;
    width: 100px;
    height: 100px;
    justify-content: center;
    text-align: center;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.flip-hint span {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    line-height: 1.2;
}

.flip-hint.visible {
    opacity: 1;
}

.flip-hint i {
    font-size: 1.5rem;
    margin-bottom: 5px;
    animation: handHint 2s infinite;
}

@keyframes handHint {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

@media(max-width: 1200px) {
    .flip-hint {
        right: 20px; /* Adjust for smaller screens */
    }
}

@media(max-width: 900px) {
    .flip-hint {
        display: none; /* Hide hint on mobile where interaction is different */
    }
}

.page {
    background-color: transparent;
    box-shadow: none;
    overflow: hidden;
}

.page-img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

[data-theme="dark"] .page {
    background-color: transparent;
    box-shadow: none;
}

/* Force library transparency */
.stPageFlip, .stPage, .stPageFlip canvas {
    background: transparent !important;
    box-shadow: none !important;
}

.catalog-download-bar {
    width: 100%;
    margin-top: 30px;
    display: flex;
    justify-content: center;
}

.catalog-download-bar .btn {
    min-width: 240px;
    padding: 18px 30px;
    font-weight: 500;
    letter-spacing: 1px;
    border-radius: 0;
}

/* ============ Scroll-Driven Interactive Engineering ============ */
.engineering-scroll {
    padding: 0;
    background: #000;
    height: 300vh;
}

.scroll-container {
    height: 100%;
    position: relative;
}

.sticky-visual {
    position: sticky;
    top: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.faucet-assembly {
    position: relative;
    width: 90%;
    max-width: 1000px;
    height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.faucet-assembly img {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: contain;
    pointer-events: none;
}

.assembly-base {
    z-index: 2;
    transition: opacity 0.5s ease, transform 0.1s linear;
}

.assembly-exploded {
    z-index: 1;
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.5s ease, transform 0.1s linear;
}

/* ============ Products Grid ============ */
.product-filters {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.filter-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.7rem;
    letter-spacing: 3px;
    padding: 10px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    border-bottom: 1px solid transparent;
}

.filter-btn.active {
    color: var(--text);
    border-bottom: 1px solid var(--accent);
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
}

.product-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    padding: 40px 30px;
    text-align: center;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-10px);
    border-color: var(--accent);
}

.product-card-img {
    width: 100%;
    height: 250px;
    object-fit: contain;
    margin-bottom: 30px;
}

.product-card h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.product-card p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ============ 3D Box & Modal ============ */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0,0,0,0.9);
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
    backdrop-filter: blur(10px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg);
    width: 100%;
    max-width: 1200px;
    padding: 60px;
    position: relative;
    border: 1px solid var(--border);
    max-height: 90vh;
    overflow-y: auto;
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 2.5rem;
    cursor: pointer;
    color: var(--text-muted);
}

.modal-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.box-3d-container {
    perspective: 2000px;
    width: 100%;
    height: 350px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 70%);
}

.box-3d {
    width: 280px;
    height: 80px;
    position: relative;
    transform-style: preserve-3d;
    transform: rotateX(-20deg) rotateY(-30deg);
    transition: transform 1.5s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.box-side {
    position: absolute;
    background: #0a0a0a;
    border: 1px solid #222;
    display: flex;
    align-items: center;
    justify-content: center;
}

.box-front { width: 280px; height: 80px; transform: translateZ(75px); }
.box-back { width: 280px; height: 80px; transform: rotateY(180deg) translateZ(75px); }
.box-left { width: 150px; height: 80px; transform: rotateY(-90deg) translateZ(140px); background: #00bcd4; border: none; }
.box-right { width: 150px; height: 80px; transform: rotateY(90deg) translateZ(140px); background: #00bcd4; border: none; }
.box-top { width: 280px; height: 150px; transform: rotateX(90deg) translateZ(75px); background: #111; transform-origin: top; transition: transform 1.2s cubic-bezier(0.4, 0, 0.2, 1); }
.box-bottom { width: 280px; height: 150px; transform: rotateX(-90deg) translateZ(-5px); }

.box-3d.open .box-top {
    transform: rotateX(90deg) rotateX(115deg) translateZ(75px);
}

.modal-product-img {
    position: absolute;
    width: 200px;
    height: auto;
    bottom: 50%;
    left: 50%;
    transform: translate(-50%, 150%) scale(0.5);
    opacity: 0;
    transition: all 1s cubic-bezier(0.16, 1, 0.3, 1);
    pointer-events: none;
    z-index: 50;
}

.box-3d.open + .modal-product-img {
    transform: translate(-50%, -10%) scale(1);
    opacity: 1;
}

.modal-info h2 {
    font-size: 2.8rem;
    margin-bottom: 10px;
    line-height: 1.1;
}

.modal-series {
    color: var(--accent);
    letter-spacing: 5px;
    text-transform: uppercase;
    font-size: 0.8rem;
    margin-bottom: 30px;
    display: block;
}

.modal-specs {
    margin-bottom: 40px;
    border-top: 1px solid var(--border);
}

.spec-row {
    padding: 18px 0;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
}

.spec-row span { color: var(--text-muted); }

.modal-features {
    list-style: none;
    margin-bottom: 40px;
}

.modal-features li {
    font-size: 0.9rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.modal-features li::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
}

.part-info-card {
    background: var(--card-bg);
    border-left: 3px solid var(--accent);
    padding: 30px;
    margin-top: 40px;
    animation: slideInRight 0.5s ease;
}

.part-info-card.hide { display: none; }

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

@media (max-width: 992px) {
    .eng-grid { grid-template-columns: 1fr; gap: 40px; }
    .modal-grid { grid-template-columns: 1fr; gap: 40px; }
    .modal-content { padding: 40px 20px; }
    .modal-info h2 { font-size: 2rem; }
}

/* ============================================================
   UNBOXING EXPERIENCE — Three.js WebGL Canvas
   ============================================================ */

.unbox-scene {
    position: absolute;
    inset: 0;
    z-index: 5;
}

#unboxCanvas {
    position: absolute;
    inset: 0;
    width: 100% !important;
    height: 100% !important;
    display: block;
}

/* ============ Part Info Card (Glassmorphism) ============ */
.part-info-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.part-info-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.part-info-glass {
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 188, 212, 0.2);
    border-radius: 16px;
    padding: 50px 40px;
    max-width: 480px;
    width: 90%;
    text-align: center;
    position: relative;
    transform: translateY(30px) scale(0.95);
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.5), 0 0 80px rgba(0, 188, 212, 0.05);
}

.part-info-overlay.active .part-info-glass {
    transform: translateY(0) scale(1);
}

[data-theme="light"] .part-info-glass {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(0, 0, 0, 0.1);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.15);
}

.part-info-close {
    position: absolute;
    top: 15px;
    right: 20px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 2rem;
    cursor: pointer;
    transition: color 0.3s ease, transform 0.3s ease;
    line-height: 1;
}

.part-info-close:hover {
    color: #00bcd4;
    transform: rotate(90deg);
}

.part-info-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 25px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(0, 188, 212, 0.15), rgba(0, 188, 212, 0.05));
    border: 1px solid rgba(0, 188, 212, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: #00bcd4;
}

.part-info-name {
    font-family: var(--font-h);
    font-size: 1.8rem;
    font-weight: 500;
    margin-bottom: 15px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text);
}

.part-info-desc {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-muted);
    max-width: 380px;
    margin: 0 auto;
}

/* ============ Progress Label ============ */
.unbox-progress-label {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 15;
    opacity: 0;
    transition: opacity 0.5s ease;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.unbox-progress-label.active {
    opacity: 1;
}

.unbox-progress-label span:first-child {
    font-family: var(--font-h);
    font-size: 1.1rem;
    letter-spacing: 5px;
    text-transform: uppercase;
    color: var(--text);
}

.unbox-sublabel {
    font-size: 0.7rem;
    letter-spacing: 3px;
    color: #00bcd4;
}

@media (max-width: 768px) {
    .part-info-glass { padding: 35px 25px; }
    .part-info-name { font-size: 1.4rem; }
}