:root {
    --atlas: #FFE600; --ind-900: #0E0E0E; --ind-800: #1A1A1A;
    --text-white: #ffffff; --text-dark: #0E0E0E;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-heading: Impact, "Arial Black", sans-serif;
    --font-mono: Consolas, "Courier New", monospace;
    --font-alt: "Trebuchet MS", "Lucida Sans Unicode", sans-serif;
    --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body { background-color: var(--ind-900); color: var(--text-white); font-family: var(--font-sans); line-height: 1.5; }
::selection { background-color: var(--atlas); color: var(--ind-900); }
.container { max-width: 1400px; margin: 0 auto; padding: 0 20px; }
.block { display: block; } .w-full { width: 100%; } .flex-1 { flex: 1; }
.bg-atlas { background-color: var(--atlas); } .bg-white { background-color: var(--text-white); } .bg-ind-900 { background-color: var(--ind-900); }
.text-atlas { color: var(--atlas); } .light-text { color: var(--text-white); } .dark-text { color: var(--ind-900); } .text-ind-900 { color: var(--ind-900); }
.mt-small { margin-top: 20px; } .mt-large { margin-top: 40px; } .mt-auto { margin-top: auto; }
.pt-section { padding-top: 80px; } .pb-section { padding-bottom: 80px; }
.opacity-70 { opacity: 0.7; } .normal-case { text-transform: none; } .underline { text-decoration: underline; text-underline-offset: 4px; }

/* Utilities */
.split-layout { display: flex; flex-direction: column; gap: 40px; }
@media (min-width: 1024px) { .split-layout { flex-direction: row; justify-content: space-between; gap: 60px; } .split-layout > div { flex: 1; } }
.align-center { align-items: center; } .align-end { align-items: flex-end; }
.flex { display: flex; } .items-center { align-items: center; } .items-end { align-items: flex-end; } .justify-center { justify-content: center; }
.gap-small { gap: 16px; } .gap-large { gap: 40px; }
.position-relative { position: relative; }

/* Typography */
.section-title { font-family: var(--font-heading); text-transform: uppercase; font-size: 2.8rem; line-height: 0.95; letter-spacing: -0.5px; }
@media(min-width: 768px){ .section-title { font-size: 4rem; } }
.section-label { display: flex; align-items: center; gap: 12px; font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.2em; }
.dark-label { color: var(--ind-900); } .light-label { color: rgba(255,255,255,0.6); }
.section-label .line { height: 1px; width: 32px; background-color: var(--ind-900); } .section-label .line-light { background-color: rgba(255,255,255,0.3); }
.mono-label { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.18em; color: rgba(255,255,255,0.5); }
.mono-label.dark { color: rgba(14,14,14,0.7); }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 16px 32px; font-family: var(--font-alt); text-transform: uppercase; font-weight: bold; text-decoration: none; cursor: pointer; transition: all 0.2s; border: none; white-space: nowrap; font-size: 1.1rem;}
.btn-sm { padding: 8px 16px; font-size: 0.9rem; }
.btn-primary { background-color: var(--atlas); color: var(--ind-900); } .btn-primary:hover { background-color: var(--text-white); transform: scale(0.98); }
.btn-black { background-color: var(--ind-900); color: var(--atlas); } .btn-black:hover { background-color: var(--ind-800); transform: scale(0.98); }
.btn-outline { background: transparent; color: var(--text-white); border: 2px solid var(--text-white); } .btn-outline:hover { background: var(--text-white); color: var(--ind-900); }
.btn-text { background: transparent; color: rgba(255,255,255,0.7); border: none; font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.18em; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; transition: color 0.2s; } .btn-text:hover { color: var(--atlas); }

/* Header */
.header { position: fixed; top: 0; left: 0; width: 100%; z-index: 50; background-color: var(--ind-900); border-bottom: 1px solid transparent; transition: border-color 0.2s ease; }
.header.scrolled { border-bottom: 1px solid rgba(255, 255, 255, 0.1); }
.header-inner { height: 64px; display: flex; justify-content: space-between; align-items: center; }
.logo { height: 56px; width: auto; }
.desktop-nav { display: none; }
@media (min-width: 768px) { .desktop-nav { display: flex; align-items: center; gap: 30px; } .mobile-menu-btn { display: none; } }
.nav-links a { color: rgba(255, 255, 255, 0.7); text-decoration: none; font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.18em; transition: color 0.2s; } .nav-links a:hover { color: var(--atlas); }
.mobile-menu-btn { background: none; border: none; color: white; cursor: pointer; padding: 8px; }
.mobile-nav { display: none; flex-direction: column; background: var(--ind-900); padding: 20px; border-top: 1px solid rgba(255,255,255,0.1); }
.mobile-nav.open { display: flex; }
.mobile-nav a { padding: 15px 0; font-family: var(--font-heading); font-size: 1.5rem; text-transform: uppercase; color: white; text-decoration: none; border-bottom: 1px solid rgba(255,255,255,0.1); }

/* Hero */
.hero { position: relative; padding-top: 100px; padding-bottom: 40px; color: var(--ind-900); }
.hero-wordmark { display: none; position: absolute; left: 0; top: 80px; height: calc(100% - 120px); opacity: 0.9; z-index: 0; }
@media(min-width: 1400px){ .hero-wordmark { display: block; } .hero-container { padding-left: 200px; } }
.hero-flex { display: flex; flex-direction: column; gap: 24px; }
@media(min-width: 1024px){ .hero-flex { flex-direction: row; align-items: flex-end; } .hero-title { flex: 0 0 auto; } .hero-desc { flex: 1; } }
.hero-title { font-family: var(--font-heading); text-transform: uppercase; font-size: 3.5rem; line-height: 0.9; letter-spacing: -1px; }
@media (min-width: 1024px) { .hero-title { font-size: 5rem; } } @media (min-width: 1280px) { .hero-title { font-size: 5.75rem; } }
.text-outline-black { color: transparent; -webkit-text-stroke: 2px var(--ind-900); }
.highlight-black { background-color: var(--ind-900); color: var(--atlas); padding: 0 10px; display: inline-block; }
.hero-desc p { font-size: 1.1rem; font-weight: 500; max-width: 600px; }
.hero-actions { display: flex; flex-direction: column; gap: 16px; } @media(min-width: 640px) { .hero-actions { flex-direction: row; align-items: center; } }

/* Hero Slider */
.hero-slider-wrap { position: relative; }
.hero-slider { position: relative; width: 100%; aspect-ratio: 2.43 / 1; background-color: var(--ind-900); overflow: hidden; }
.hero-slider .slide { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transform: translateX(3%); transition: opacity 0.4s var(--ease-out), transform 0.4s var(--ease-out); }
.hero-slider .active-slide { opacity: 1; transform: translateX(0); }
.slider-controls { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; }
.slider-indicators { display: flex; gap: 8px; }
.indicator { height: 4px; width: 40px; background: rgba(14,14,14,0.2); position: relative; overflow: hidden; cursor: pointer; }
@media(min-width: 640px) { .indicator { width: 56px; } }
.indicator-fill { position: absolute; top: 0; left: 0; height: 100%; width: 0%; background: var(--ind-900); }
.slider-arrows { display: flex; gap: 4px; }
.arrow-btn { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; background: var(--ind-900); color: var(--atlas); border: none; cursor: pointer; transition: transform 0.1s, background 0.2s; }
.arrow-btn:hover { background: var(--ind-800); transform: scale(0.96); }

/* Sections */
.section { padding: 80px 0; }
.highlight-atlas { background-color: var(--atlas); padding: 0 10px; }
.highlight-black-small { background-color: var(--ind-900); padding: 0 8px; color: var(--atlas); }
.desc-grid { display: grid; gap: 20px; margin-top: 30px; font-size: 1.1rem; color: #444; } @media(min-width: 640px){ .desc-grid{ grid-template-columns: 1fr 1fr;} }
.audiences { margin-top: 40px; padding-top: 24px; border-top: 2px solid var(--ind-900); }
.audience-list { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 12px; }
.audience-item { font-family: var(--font-heading); font-size: 1.5rem; text-transform: uppercase; } @media(min-width: 768px){.audience-item{font-size: 2rem;}}
.responsive-img { width: 100%; height: auto; object-fit: cover; }
.aspect-portrait { aspect-ratio: 4/5; }
.image-badge { position: absolute; bottom: -20px; left: -20px; background-color: var(--ind-900); color: var(--text-white); padding: 24px; max-width: 280px; }
.badge-sub { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.2em; color: rgba(255,255,255,0.6); }
.badge-title { font-family: var(--font-heading); font-size: 24px; color: var(--atlas); text-transform: uppercase; margin-top: 5px; line-height: 1;}

/* Why Atlas - Weld Stage (Sticky Scroll) */
.advantage-emblem-wrap { width: 80px; flex-shrink: 0; } @media(min-width: 1024px){.advantage-emblem-wrap{width: 112px;}}
.advantage-emblem { width: 562%; max-width: none; margin-left: -231%; margin-top: -77.8%; }
.weld-track { position: relative; height: 340vh; margin-top: 40px; display: none; }
@media(min-width: 1024px) { .weld-track { display: block; } } /* Only run desktop interactive weld stage on desktop to save space, simple list on mobile if desired, but focusing on exact desktop replication */
.weld-stage.sticky { position: sticky; top: 0; height: 100vh; overflow: hidden; background: var(--ind-900); color: white; display: flex; flex-direction: column; padding-top: 64px;}
.weld-hud { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 20px; padding: 16px 0; border-bottom: 1px solid rgba(255,255,255,0.1); font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.18em; }
.hud-items { display: flex; gap: 32px; flex-wrap: wrap;}
.hud-readout { display: flex; gap: 8px; } .hud-label { color: rgba(255,255,255,0.4); } .hud-value { color: var(--atlas); font-weight: bold; }
.weld-grid { flex: 1; display: grid; grid-template-rows: 1fr 44px 1fr; padding: 24px 0; }
.plate { background: var(--ind-800); position: relative; display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid rgba(255,255,255,0.1); }
.plate-top { border-bottom: none; } .plate-bottom { border-top: none; }
.plate-label { position: absolute; left: 16px; font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.2em; color: rgba(255,255,255,0.3); }
.plate-top .plate-label { top: 12px; } .plate-bottom .plate-label { bottom: 12px; }
.station { padding: 12px 10%; display: flex; flex-direction: column; position: relative; transition: opacity 0.2s; opacity: 0.4; }
.plate-top .station { justify-content: flex-end; } .plate-bottom .station { justify-content: flex-start; }
.station.passed { opacity: 1; }
.station-tick { width: 1px; height: 40px; background: rgba(255,255,255,0.2); flex-shrink: 0; transition: background 0.2s;}
.station.passed .station-tick { background: var(--atlas); }
.station-content { max-width: 280px; position: relative; }
.station-title { font-family: var(--font-heading); font-size: 1.8rem; text-transform: uppercase; transition: color 0.1s; }
.station.hot .station-title { color: var(--atlas); }
.station-desc { font-size: 0.85rem; color: rgba(255,255,255,0.7); margin-top: 8px; }
.station-proof { list-style: none; margin-top: 12px; font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; color: rgba(255,255,255,0.5); }
.station-proof li { display: flex; align-items: flex-start; gap: 8px; margin-bottom: 4px;}
.station-proof li::before { content: ""; display: block; width: 6px; height: 6px; background: rgba(255,255,255,0.3); margin-top: 5px; }
.station.passed .station-proof li::before { background: var(--atlas); }
.station-check { position: absolute; top: 0; right: 0; border: 2px solid var(--atlas); color: var(--atlas); padding: 2px 6px; font-family: var(--font-mono); font-size: 10px; font-weight: bold; text-transform: uppercase; display: none; background: var(--ind-900); transform: rotate(-8deg); }
.station.passed .station-check { display: block; animation: stamp 0.2s var(--ease-out); }
@keyframes stamp { from { opacity: 0; transform: scale(1.35) rotate(-16deg); } to { opacity: 1; transform: scale(1) rotate(-8deg); } }

/* The Seam & Bead */
.seam { position: relative; background: #000; border-top: 1px solid rgba(255,255,255,0.2); border-bottom: 1px solid rgba(255,255,255,0.2); }
.seam-line { position: absolute; top: 50%; left: 0; width: 100%; height: 1px; background: rgba(255,255,255,0.1); }
.weld-bead { position: absolute; inset: 0; pointer-events: none; }
.ripple { position: absolute; top: 50%; width: 18px; height: 72%; transform: translate(-50%, -50%); border-radius: 50%; border: 1px solid rgba(0,0,0,0.3); border-right-width: 2px; }
.mig-gun { position: absolute; top: 50%; z-index: 20; pointer-events: none; transform: translateY(-50%); transition: left 0.1s linear;}
.spark { position: absolute; top: 50%; border-radius: 50%; pointer-events: none; }

/* Seal of Approval */
.weld-seal { display: flex; flex-direction: column; gap: 12px; border: 2px solid var(--atlas); padding: 16px 24px; display: none; transform: rotate(-6deg); }
.weld-seal.active { display: flex; animation: stamp 0.25s var(--ease-out); }
.weld-seal-icon { background: var(--atlas); padding: 8px 12px; width: max-content; }
.weld-seal-icon img { width: 48px; }

/* Brands */
.filters { display: flex; gap: 8px; flex-wrap: wrap; }
.filter-btn { display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px; font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.15em; border: none; cursor: pointer; transition: all 0.15s; background: rgba(255,255,255,0.05); color: rgba(255,255,255,0.6); }
.filter-btn:hover { background: rgba(255,255,255,0.1); color: white; }
.filter-btn.active { background: var(--atlas); color: var(--ind-900); font-weight: bold; }
.pegboard { margin-top: 24px; border: 1px solid rgba(255,255,255,0.1); background-color: var(--ind-900); background-image: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIyMiIgaGVpZ2h0PSIyMiI+PGNpcmNsZSBjeD0iMTEiIGN5PSIxMSIgcj0iMS42IiBmaWxsPSIjZmZmZmZmIiBmaWxsLW9wYWNpdHk9IjAuMDkiLz48L3N2Zz4='); padding: 24px; }
.brand-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
@media (min-width: 768px) { .brand-grid { grid-template-columns: repeat(4, 1fr); gap: 24px; } } @media (min-width: 1024px) { .brand-grid { grid-template-columns: repeat(5, 1fr); } }
.brand-card { display: flex; flex-direction: column; transition: opacity 0.2s, filter 0.2s; opacity: 1; }
.brand-card.dimmed { opacity: 0.2; filter: grayscale(100%); }
.brand-card.receded { opacity: 0.5; }
.brand-plate { position: relative; background: white; flex: 1; display: flex; align-items: center; justify-content: center; aspect-ratio: 3/2; overflow: hidden; transition: transform 0.2s var(--ease-out); }
.brand-plate.featured { aspect-ratio: auto; min-height: 180px; }
.brand-card:hover .brand-plate { transform: translateY(-4px); }
.brand-img { transition: transform 0.2s var(--ease-out); max-height: 80%; max-width: 80%; }
.brand-card:hover .brand-img { transform: scale(1.05) !important; }
.brand-line { position: absolute; bottom: 0; left: 0; height: 4px; width: 100%; background: var(--atlas); transform: scaleX(0); transform-origin: left; transition: transform 0.2s var(--ease-out); }
.brand-card:hover .brand-line { transform: scaleX(1); }
.brand-caption { margin-top: 10px; display: flex; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.15em; color: rgba(255,255,255,0.5); }
.brand-caption span.dot { width: 6px; height: 6px; flex-shrink: 0; }

/* Products Accordion */
.interactive-hint { display: inline-flex; align-items: center; gap: 8px; background: var(--ind-900); color: var(--atlas); padding: 8px 12px; font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: 0.15em; font-weight: bold; margin-top: 16px; }
.product-accordion { display: flex; flex-direction: column; gap: 4px; height: auto; list-style: none;}
@media (min-width: 1024px) { .product-accordion { flex-direction: row; height: 620px; } }
.accordion-item { position: relative; background: var(--ind-900); overflow: hidden; cursor: pointer; height: 48px; transition: all 0.3s var(--ease-out); display: flex; flex-direction: column; min-width: 0;}
@media (min-width: 1024px) { .accordion-item { height: auto; flex: 1; } }
.accordion-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0.2; filter: grayscale(100%); transform: scale(1.1); transition: all 0.3s var(--ease-out); }
.accordion-item:hover .accordion-img { opacity: 0.35; }
.accordion-btn { position: absolute; inset: 0; display: flex; align-items: center; gap: 16px; padding: 0 16px; color: white; background: none; border: none; cursor: pointer; z-index: 10; width: 100%; text-align: left; }
@media(min-width: 1024px) { .accordion-btn { flex-direction: column; justify-content: space-between; padding: 20px 0; } }
.acc-serial { font-family: var(--font-heading); font-size: 1rem; color: var(--atlas); }
.acc-title-mob { font-family: var(--font-heading); font-size: 1.1rem; text-transform: uppercase; letter-spacing: 1px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.acc-title-desk { display: none; font-family: var(--font-heading); font-size: 22px; text-transform: uppercase; white-space: nowrap; writing-mode: vertical-rl; transform: rotate(180deg); }
@media(min-width: 1024px){ .acc-title-mob{display:none;} .acc-title-desk{display:block;} }
.acc-dot { width: 6px; height: 6px; background: var(--atlas); display: none; } @media(min-width: 1024px){.acc-dot{display:block;}}
.accordion-details { position: relative; flex-shrink: 0; display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.3s var(--ease-out); }
.acc-top-line { position: absolute; top: 0; left: 0; width: 100%; height: 4px; background: var(--atlas); transform: scaleX(0); transform-origin: left; transition: transform 0.3s var(--ease-out); z-index: 10;}
.acc-content { min-height: 0; overflow: hidden; opacity: 0; transition: opacity 0.2s; padding: 20px; display: grid; gap: 16px; }
@media(min-width: 1280px) { .acc-content { grid-template-columns: 1fr 1.15fr; gap: 32px; padding: 24px;} }
.acc-brand { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.18em; color: var(--atlas); }
.acc-heading { font-family: var(--font-heading); font-size: 2rem; text-transform: uppercase; color: white; margin-top: 6px; line-height: 1; }
.acc-tagline { font-size: 14px; color: rgba(255,255,255,0.6); margin-top: 8px; }
.acc-link { font-family: var(--font-alt); font-size: 14px; font-weight: bold; text-transform: uppercase; color: var(--atlas); margin-top: 16px; display: block; }
.acc-list { list-style: none; display: grid; gap: 6px; } @media(min-width: 640px){.acc-list{grid-template-columns: 1fr 1fr;}} @media(min-width: 1280px){.acc-list{grid-template-columns: 1fr; border-left: 1px solid rgba(255,255,255,0.15); padding-left: 24px;}}
.acc-list li { display: flex; align-items: flex-start; gap: 10px; font-size: 13px; color: rgba(255,255,255,0.85); }
.acc-list li::before { content: ""; display: block; width: 6px; height: 6px; background: var(--atlas); margin-top: 6px; flex-shrink: 0; }

.accordion-item.active { height: 600px; } @media(min-width: 1024px){.accordion-item.active{flex-grow: 16; height: auto;}}
.accordion-item.active .accordion-img { opacity: 1; filter: grayscale(0%); transform: scale(1); }
.accordion-item.active .accordion-btn { position: absolute; top: 16px; left: 16px; background: var(--atlas); color: var(--ind-900); padding: 4px 8px; width: auto; height: auto; font-family: var(--font-mono); font-size: 11px; font-weight: bold; display: inline-block; right: auto; bottom: auto;}
.accordion-item.active .acc-title-desk, .accordion-item.active .acc-title-mob, .accordion-item.active .acc-dot { display: none; }
.accordion-item.active .accordion-details { grid-template-rows: 1fr; }
.accordion-item.active .acc-top-line { transform: scaleX(1); transition-delay: 0.1s;}
.accordion-item.active .acc-content { opacity: 1; transition-delay: 0.15s; }

/* Catalogue & Specs */
.specs { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid rgba(255,255,255,0.15); border-bottom: 1px solid rgba(255,255,255,0.15); }
.specs > div { padding: 16px 12px 16px 0; border-right: 1px solid rgba(255,255,255,0.15); }
.specs > div:not(:first-child) { padding-left: 16px; } .specs > div:last-child { border-right: none; }
.specs dt { font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.18em; color: rgba(255,255,255,0.45); }
.specs dd { font-family: var(--font-heading); font-size: 2rem; color: var(--atlas); margin-top: 4px; line-height: 1; }

.book-wrapper { display: flex; flex-direction: column; align-items: center; width: 280px; margin: 0 auto; }
@media (min-width: 1024px) { .book-wrapper { width: 380px; align-items: flex-end; } }
.book-container { position: relative; width: 100%; aspect-ratio: 1623/2296; perspective: 1800px; }
.book-container::before { content: ""; position: absolute; inset: 0; background: rgba(255,255,255,0.9); transform: translate(8px, 8px); }
.book-container::after { content: ""; position: absolute; inset: 0; background: #fff; transform: translate(4px, 4px); }
.book-inside { position: absolute; inset: 0; background: #fff; color: var(--ind-900); padding: 9%; display: flex; flex-direction: column; z-index: 1; }
.book-sub { font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.2em; color: rgba(14,14,14,0.5); }
.book-title { font-family: var(--font-heading); font-size: 2.5rem; text-transform: uppercase; line-height: 1; margin-top: 8px; }
.book-line { width: 48px; height: 4px; background: var(--atlas); margin-top: 16px; display: block; }
.book-toc { list-style: none; margin-top: 24px; display: flex; flex-direction: column; gap: 12px; }
.book-toc li { display: flex; align-items: baseline; gap: 8px; }
.toc-title { font-family: var(--font-alt); font-weight: bold; text-transform: uppercase; font-size: 14px; white-space: nowrap; }
.toc-dots { flex: 1; border-bottom: 1px dotted rgba(14,14,14,0.4); transform: translateY(-3px); }
.toc-page { font-family: var(--font-mono); font-weight: bold; font-size: 14px; }
.book-cover { position: absolute; inset: 0; transform-origin: left center; transform-style: preserve-3d; transition: transform 0.4s var(--ease-out); z-index: 2; box-shadow: 0 30px 60px -20px rgba(0,0,0,0.7); }
.book-cover.open { transform: rotateY(-158deg); }
.cover-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; backface-visibility: hidden; }
.book-cover::after { content: "Atlas Advanced Industrial Equipment"; position: absolute; inset: 0; background: var(--ind-800); color: rgba(255,255,255,0.4); font-family: var(--font-mono); font-size: 10px; text-transform: uppercase; letter-spacing: 0.2em; display: flex; align-items: flex-end; padding: 9%; transform: rotateY(180deg); backface-visibility: hidden; }

/* Contact Form */
.sentence-form { font-family: var(--font-heading); font-size: 2rem; text-transform: uppercase; line-height: 1.6; }
@media (min-width: 768px) { .sentence-form { font-size: 3rem; } } @media (min-width: 1280px) { .sentence-form { font-size: 3.5rem; } }
.sentence-form input { background: transparent; border: none; border-bottom: 4px solid var(--ind-900); font-family: inherit; font-size: inherit; text-transform: inherit; color: inherit; outline: none; padding: 0 4px; margin: 0 4px; transition: border-color 0.2s; width: auto; max-width: 100%; }
.sentence-form input::placeholder { color: rgba(14,14,14,0.3); }
.sentence-form input:focus { border-bottom-color: var(--text-white); }
.sentence-form input.error { border-bottom-color: #b91c1c; }
.need-btn { display: inline-block; padding: 0 6px; background: transparent; border: none; font-family: inherit; font-size: inherit; text-transform: inherit; color: rgba(14,14,14,0.3); cursor: pointer; transition: color 0.15s, background 0.15s; outline: none; }
.need-btn:hover { color: var(--ind-900); }
.need-btn.selected { background: var(--ind-900); color: var(--atlas); }
.need-sep { color: rgba(14,14,14,0.3); }
.form-textarea { width: 100%; background: transparent; border: none; border-bottom: 2px solid var(--ind-900); font-size: 1.2rem; color: var(--ind-900); outline: none; resize: none; padding: 8px 0; transition: border-color 0.2s; font-family: var(--font-sans); font-weight: 500;}
.form-textarea:focus { border-bottom-color: var(--text-white); }
.form-submit-area { display: flex; flex-direction: column; align-items: flex-end; gap: 12px; }
.form-error { color: #b91c1c; font-weight: bold; }
.form-success .success-title { font-family: var(--font-heading); font-size: 2.5rem; text-transform: uppercase; line-height: 1.1; }
@media (min-width: 768px) { .form-success .success-title { font-size: 4rem; } }
.contact-channels { border-top: 2px solid var(--ind-900); padding-top: 32px; display: grid; gap: 24px; }
@media(min-width: 640px){.contact-channels{grid-template-columns: 1fr 1fr;}} @media(min-width: 1024px){.contact-channels{grid-template-columns: repeat(3, 1fr);}}
.contact-channels dt { font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.18em; color: rgba(14,14,14,0.55); }
.contact-channels dd { font-size: 1rem; font-weight: bold; margin-top: 4px; }
.contact-channels a { color: inherit; text-decoration: none; transition: text-decoration 0.2s; }
.contact-channels a:hover { text-decoration: underline; text-underline-offset: 4px; }

/* Footer */
.footer { background-color: var(--ind-900); color: rgba(255, 255, 255, 0.4); padding: 40px 0; }
.footer-inner { display: flex; flex-direction: column; align-items: flex-start; gap: 20px; }
@media (min-width: 768px) { .footer-inner { flex-direction: row; justify-content: space-between; align-items: center; } .footer-links { text-align: right; } }
.footer-logo { height: 56px; }
.footer-links { display: flex; flex-direction: column; gap: 12px; font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.15em; }
.footer-links a { color: inherit; text-decoration: none; margin-right: 24px; display: inline-block; transition: color 0.2s; }
.footer-links a:hover { color: white; }

/* Animations */
@keyframes slideUp { from { transform: translateY(105%); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.slide-up { display: inline-block; animation: slideUp 0.4s var(--ease-out) forwards; } .delay-1 { animation-delay: 0.1s; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { opacity: 0; animation: fadeIn 0.4s var(--ease-out) 0.25s forwards; }
.reveal { opacity: 0; transform: translateY(24px); transition: all 0.5s var(--ease-out); } .reveal.active { opacity: 1; transform: translateY(0); }