/* ==========================================================================
   TATA ELXSI-INSPIRED FLOATING TEMPLATE
   Shared stylesheet for /pages/*.html and /catalogues/*.html
   ========================================================================== */

*{margin:0;padding:0;box-sizing:border-box}
:root{
  --primary:#0a1628;
  --primary-light:#152238;
  --accent:#c9a84c;
  --accent-dark:#8a6f27;
  --white:#ffffff;
  --off-white:#f7f5f0;
  --gray-50:#faf9f7;
  --gray-100:#e5e2dc;
  --gray-300:#c1beb8;
  --gray-500:#8a8782;
  --gray-600:#5c5a58;
  --gray-900:#1a1a1a;
}
html{scroll-behavior:smooth}
body{font-family:'Inter',sans-serif;color:var(--gray-900);background:var(--white);line-height:1.6;overflow-x:hidden}
h1,h2,h3,h4{font-family:'Playfair Display',serif;font-weight:500;letter-spacing:-.01em;line-height:1.1}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

/* TOP NAV */
.top-nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:18px 48px;display:flex;justify-content:space-between;align-items:center;background:rgba(255,255,255,.85);backdrop-filter:blur(14px);border-bottom:1px solid var(--gray-100);transition:all .4s}
.top-nav.scrolled{padding:12px 48px;background:rgba(255,255,255,.97)}
.tn-brand{display:flex;align-items:center;gap:12px;flex-wrap:nowrap;min-width:0;flex:1;overflow:hidden}
.tn-brand img{height:38px;width:auto;max-width:160px;object-fit:contain;flex-shrink:0;display:block}
.tn-brand .tn-name{font-size:.78rem;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tn-brand .tn-sep{width:1px;height:18px;background:var(--gray-300);flex-shrink:0}
.tn-brand .tn-tag{font-size:.68rem;letter-spacing:1.2px;color:var(--gray-500);text-transform:uppercase;font-weight:500;white-space:nowrap}
.tn-back{display:inline-flex;align-items:center;gap:6px;font-size:.72rem;letter-spacing:1.5px;font-weight:600;text-transform:uppercase;color:var(--gray-600);transition:color .3s;flex-shrink:0}
.tn-back:hover{color:var(--accent-dark)}

/* HERO */
.hero{position:relative;min-height:100vh;background:var(--primary);overflow:hidden;display:flex;align-items:center;padding:120px 48px 80px}
.hero::before{content:'';position:absolute;top:0;right:0;width:60%;height:100%;background:radial-gradient(ellipse at top right,rgba(201,168,76,.12),transparent 60%)}
.hero::after{content:'';position:absolute;bottom:-1px;left:0;right:0;height:60px;background:linear-gradient(to bottom,transparent,var(--off-white));pointer-events:none;z-index:1}
.hero-inner{max-width:1400px;margin:0 auto;width:100%;display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center;position:relative;z-index:2}
.hero-inner.single{grid-template-columns:1fr;max-width:900px;text-align:center}
.hero-inner.single .hero-meta{justify-content:center}
.hero-inner.single .hero-cta-row{justify-content:center}
.hero-left .eyebrow,.hero-single .eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:.7rem;letter-spacing:2.5px;font-weight:600;text-transform:uppercase;color:var(--accent);margin-bottom:32px}
.hero-left .eyebrow .line,.hero-single .eyebrow .line{width:40px;height:1px;background:var(--accent)}
.hero-left h1,.hero-single h1{font-size:clamp(2.4rem,5.2vw,4.6rem);color:var(--white);font-weight:400;margin-bottom:32px}
.hero-left h1 em,.hero-single h1 em{font-style:italic;color:var(--accent);font-weight:500}
.hero-left .hero-desc,.hero-single .hero-desc{font-size:1.02rem;color:rgba(255,255,255,.72);max-width:620px;margin-bottom:40px;font-weight:300;line-height:1.8}
.hero-inner.single .hero-desc{margin-left:auto;margin-right:auto}
.hero-meta{display:flex;gap:40px;margin-bottom:48px;padding-top:32px;border-top:1px solid rgba(255,255,255,.12);flex-wrap:wrap}
.hero-meta-item .num{font-family:'Playfair Display',serif;font-size:2.4rem;color:var(--accent);font-weight:500;line-height:1}
.hero-meta-item .lbl{font-size:.65rem;letter-spacing:2px;text-transform:uppercase;color:rgba(255,255,255,.55);margin-top:8px;font-weight:500}
.hero-cta-row{display:flex;gap:16px;align-items:center;flex-wrap:wrap}
.btn-primary{display:inline-flex;align-items:center;gap:10px;background:var(--accent);color:var(--primary);padding:18px 32px;font-size:.76rem;font-weight:700;letter-spacing:2px;text-transform:uppercase;transition:all .3s;border:1px solid var(--accent);cursor:pointer;text-align:center}
.btn-primary:hover{background:transparent;color:var(--accent)}
.btn-ghost{display:inline-flex;align-items:center;gap:10px;color:rgba(255,255,255,.8);padding:18px 24px;font-size:.72rem;font-weight:500;letter-spacing:2px;text-transform:uppercase;border:1px solid rgba(255,255,255,.25);transition:all .3s;cursor:pointer;text-align:center}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}
.hero-right{position:relative;perspective:1200px;max-width:100%}
.hero-cover{position:relative;border:1px solid rgba(255,255,255,.1);box-shadow:0 40px 80px rgba(0,0,0,.5),0 0 0 1px rgba(201,168,76,.15);transform:rotate(-3deg) translateZ(0);animation:float 6s ease-in-out infinite;background:var(--primary-light);overflow:hidden}
.hero-cover img{width:100%;display:block}
.hero-cover-2{position:absolute;top:8%;right:-2%;width:55%;border:1px solid rgba(255,255,255,.08);box-shadow:0 30px 60px rgba(0,0,0,.4);transform:rotate(6deg);animation:float2 7s ease-in-out infinite .5s;background:var(--primary-light);overflow:hidden}
.hero-cover-2 img{width:100%;display:block}
.hero-emoji-card{background:linear-gradient(135deg,var(--primary-light),#1d2d47);padding:80px 40px;font-size:7.5rem;text-align:center;line-height:1;color:var(--accent);border:1px solid rgba(201,168,76,.15)}
.hero-emoji-card.small{padding:40px 24px;font-size:4.5rem}
@keyframes float{0%,100%{transform:rotate(-3deg) translateY(0)}50%{transform:rotate(-3deg) translateY(-12px)}}
@keyframes float2{0%,100%{transform:rotate(6deg) translateY(0)}50%{transform:rotate(6deg) translateY(-16px)}}
.scroll-cue{position:absolute;bottom:32px;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:10px;color:rgba(255,255,255,.4);font-size:.65rem;letter-spacing:2.5px;text-transform:uppercase;font-weight:500;z-index:2}
.scroll-cue .sc-line{width:1px;height:40px;background:linear-gradient(transparent,rgba(201,168,76,.6));animation:pulse 2s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:.3}50%{opacity:1}}

/* INTRO SECTION */
.intro{padding:140px 48px;background:var(--off-white);position:relative}
.intro-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1fr 1.3fr;gap:100px;align-items:start}
.intro-label{font-size:.7rem;letter-spacing:2.5px;font-weight:600;text-transform:uppercase;color:var(--accent-dark);margin-bottom:20px;display:flex;align-items:center;gap:12px}
.intro-label .line{width:30px;height:1px;background:var(--accent-dark)}
.intro h2{font-size:clamp(2rem,3.5vw,3rem);color:var(--primary);margin-bottom:32px}
.intro h2 em{font-style:italic;color:var(--accent-dark)}
.intro p{color:var(--gray-600);font-size:.98rem;line-height:1.9;margin-bottom:24px;font-weight:300}
.intro-stats{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--gray-100);margin-top:32px;border:1px solid var(--gray-100)}
.intro-stat{padding:28px 24px;background:var(--white)}
.intro-stat .num{font-family:'Playfair Display',serif;font-size:2.2rem;color:var(--primary);font-weight:500}
.intro-stat .lbl{font-size:.7rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--gray-500);margin-top:6px;font-weight:500}

/* SIDE NAV - PROGRESS DOTS */
.side-nav{position:fixed;right:32px;top:50%;transform:translateY(-50%);z-index:50;display:flex;flex-direction:column;gap:10px}
.side-nav-dot{width:6px;height:6px;border-radius:50%;background:var(--gray-300);cursor:pointer;position:relative;transition:all .3s}
.side-nav-dot.active{background:var(--accent);transform:scale(1.6)}
.side-nav-dot:hover::after{content:attr(data-label);position:absolute;right:18px;top:50%;transform:translateY(-50%);background:var(--primary);color:var(--white);padding:6px 12px;font-size:.62rem;letter-spacing:1.2px;text-transform:uppercase;white-space:nowrap;font-weight:600}

/* PAGE CHAPTERS */
.pages{padding:0;background:var(--white)}
.chapter{position:relative;min-height:auto;padding:120px 48px;overflow:hidden;border-bottom:1px solid var(--gray-100)}
.chapter:nth-child(even){background:var(--gray-50)}
.chapter-inner{max-width:1300px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:100px;align-items:center;position:relative;z-index:2}
.chapter-inner.single,.chapter-inner.wide{grid-template-columns:1fr;max-width:1100px;gap:0}
.chapter:nth-child(odd) .chapter-inner{direction:rtl}
.chapter:nth-child(odd) .chapter-inner > *{direction:ltr}
.chapter:nth-child(odd) .chapter-inner.single,.chapter:nth-child(odd) .chapter-inner.wide{direction:ltr}
.chapter-num{position:absolute;top:60px;right:48px;font-family:'Playfair Display',serif;font-size:clamp(8rem,14vw,14rem);font-weight:400;color:var(--gray-100);line-height:.8;letter-spacing:-.04em;z-index:1;user-select:none;pointer-events:none}
.chapter:nth-child(odd) .chapter-num{left:48px;right:auto}
.chapter:nth-child(even) .chapter-inner.wide ~ .chapter-num,
.chapter:nth-child(odd) .chapter-inner.wide ~ .chapter-num{opacity:.6}
.chapter-content{position:relative;z-index:3}
.chapter-inner.wide .chapter-content,
.chapter-inner.single .chapter-content{max-width:1100px}
.chapter-eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:.66rem;letter-spacing:2.5px;font-weight:600;text-transform:uppercase;color:var(--accent-dark);margin-bottom:24px}
.chapter-eyebrow .line{width:30px;height:1px;background:var(--accent-dark)}
.chapter h3{font-size:clamp(1.8rem,3.2vw,2.8rem);color:var(--primary);margin-bottom:24px;font-weight:500}
.chapter h3 em{font-style:italic;color:var(--accent-dark)}
.chapter .chapter-desc{font-size:.98rem;color:var(--gray-600);line-height:1.9;margin-bottom:28px;font-weight:300;max-width:520px}
.chapter-inner.wide .chapter-desc,
.chapter-inner.single .chapter-desc{max-width:760px}
.chapter-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px}
.chapter-tag{font-size:.64rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--gray-600);padding:6px 12px;border:1px solid var(--gray-100);background:var(--white);font-weight:600}
.chapter-bullets{list-style:none;padding:0;margin:0 0 28px}
.chapter-bullets li{position:relative;padding:10px 0 10px 24px;border-bottom:1px solid var(--gray-100);font-size:.92rem;color:var(--gray-600);line-height:1.7}
.chapter-bullets li::before{content:'';position:absolute;left:0;top:18px;width:10px;height:1px;background:var(--accent)}
.chapter-bullets li strong{color:var(--primary);font-weight:700}
.chapter-bullets li a{display:block;color:inherit;transition:color .3s}
.chapter-bullets li a:hover{color:var(--accent-dark)}
.chapter-bullets li a:hover strong{color:var(--accent-dark)}
.view-link{display:inline-flex;align-items:center;gap:8px;font-size:.72rem;letter-spacing:2px;text-transform:uppercase;font-weight:600;color:var(--primary);padding:12px 0;border-bottom:1px solid var(--primary);transition:all .3s;cursor:pointer}
.view-link:hover{color:var(--accent-dark);border-color:var(--accent-dark);gap:14px}

.chapter-visual{position:relative;cursor:default}
.chapter-visual.zoomable{cursor:zoom-in}
.chapter-visual-frame{position:relative;border:1px solid var(--gray-100);overflow:hidden;box-shadow:0 30px 60px rgba(10,22,40,.12);transform:translateY(0);transition:all .6s cubic-bezier(.4,0,.2,1);background:var(--white)}
.chapter-visual:hover .chapter-visual-frame{transform:translateY(-8px);box-shadow:0 50px 100px rgba(10,22,40,.2)}
.chapter-visual-frame img{width:100%;display:block;transition:transform .8s cubic-bezier(.4,0,.2,1)}
.chapter-visual:hover .chapter-visual-frame img{transform:scale(1.04)}
.chapter-visual::after{content:'';position:absolute;inset:-8px;border:1px solid var(--accent);z-index:-1;transform:translate(16px,16px);transition:all .4s}
.chapter-visual:hover::after{transform:translate(22px,22px)}
.chapter-zoom{position:absolute;top:16px;right:16px;width:48px;height:48px;background:rgba(10,22,40,.85);backdrop-filter:blur(6px);color:var(--accent);display:flex;align-items:center;justify-content:center;font-size:1rem;opacity:0;transition:opacity .3s}
.chapter-visual.zoomable:hover .chapter-zoom{opacity:1}
.chapter-visual-emoji{font-size:6rem;text-align:center;padding:100px 40px;background:linear-gradient(135deg,var(--off-white) 0%,#efebe0 100%);color:var(--accent-dark);line-height:1;border:1px solid var(--gray-100);box-shadow:0 20px 50px rgba(10,22,40,.08);position:relative}
.chapter-visual-emoji::before{content:'';position:absolute;top:24px;left:24px;right:24px;height:1px;background:linear-gradient(90deg,transparent,rgba(201,168,76,.4),transparent)}
.chapter-visual-emoji::after{content:'';position:absolute;bottom:24px;left:24px;right:24px;height:1px;background:linear-gradient(90deg,transparent,rgba(201,168,76,.4),transparent)}
.chapter-visual-card{padding:48px 32px;background:var(--white);display:flex;flex-direction:column;gap:16px;border:1px solid var(--gray-100);box-shadow:0 20px 50px rgba(10,22,40,.08)}
.chapter-visual-card .cv-badge{font-size:.62rem;letter-spacing:1.5px;text-transform:uppercase;color:var(--accent-dark);font-weight:700;margin-bottom:8px}
.chapter-visual-card h5{font-family:'Playfair Display',serif;font-size:1.6rem;color:var(--primary);font-weight:500}
.chapter-visual-card p{color:var(--gray-600);font-size:.9rem;line-height:1.8;font-weight:300}
.chapter-visual-card .cv-meta{display:flex;gap:20px;margin-top:12px;padding-top:20px;border-top:1px solid var(--gray-100)}
.chapter-visual-card .cv-meta-item{font-size:.72rem}
.chapter-visual-card .cv-meta-item .n{font-family:'Playfair Display',serif;font-size:1.6rem;color:var(--accent-dark);display:block}
.chapter-visual-card .cv-meta-item .l{font-size:.62rem;letter-spacing:1.2px;text-transform:uppercase;color:var(--gray-500);margin-top:4px}

/* GRID CHAPTER - for cards/tools/reports grids */
.chapter-grid{display:grid;gap:1px;background:var(--gray-100);border:1px solid var(--gray-100);margin-top:40px;box-shadow:0 20px 50px rgba(10,22,40,.06)}
.chapter-grid.c2{grid-template-columns:repeat(2,1fr)}
.chapter-grid.c3{grid-template-columns:repeat(3,1fr)}
.chapter-grid.c4{grid-template-columns:repeat(4,1fr)}
.chapter-grid-cell{background:var(--white);padding:28px 24px;transition:all .3s;position:relative;overflow:hidden}
.chapter-grid-cell::before{content:'';position:absolute;left:0;top:0;bottom:0;width:2px;background:var(--accent);transform:scaleY(0);transform-origin:bottom;transition:transform .4s}
.chapter-grid-cell:hover{background:var(--off-white);z-index:2}
.chapter-grid-cell:hover::before{transform:scaleY(1);transform-origin:top}
.chapter-grid-cell .cgc-num{font-family:'Playfair Display',serif;font-size:.78rem;color:var(--accent-dark);font-weight:600;margin-bottom:12px;letter-spacing:.5px}
.chapter-grid-cell h5{font-family:'Playfair Display',serif;font-size:1.15rem;color:var(--primary);font-weight:500;margin-bottom:10px;line-height:1.3}
.chapter-grid-cell p{color:var(--gray-600);font-size:.82rem;line-height:1.7;font-weight:300}
.chapter-grid-cell .cgc-meta{font-size:.6rem;letter-spacing:1.2px;text-transform:uppercase;color:var(--accent-dark);margin-top:14px;font-weight:700;display:inline-flex;align-items:center;gap:6px}
.chapter-grid-cell a{display:block;height:100%;color:inherit}
.chapter-grid-cell a:hover{color:inherit}

/* CTA SECTION */
.cta-section{background:var(--primary);color:var(--white);padding:140px 48px;text-align:center;position:relative;overflow:hidden}
.cta-section::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse at center,rgba(201,168,76,.15),transparent 60%)}
.cta-inner{max-width:800px;margin:0 auto;position:relative;z-index:2}
.cta-section .eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:.7rem;letter-spacing:2.5px;font-weight:600;text-transform:uppercase;color:var(--accent);margin-bottom:28px}
.cta-section .eyebrow .line{width:40px;height:1px;background:var(--accent)}
.cta-section h2{font-size:clamp(2rem,4vw,3.4rem);margin-bottom:32px;font-weight:400}
.cta-section h2 em{font-style:italic;color:var(--accent);font-weight:500}
.cta-section p{color:rgba(255,255,255,.65);font-size:1rem;margin-bottom:48px;line-height:1.8;font-weight:300;max-width:600px;margin-left:auto;margin-right:auto}
.cta-row{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* FOOTER */
footer{background:#060f1d;color:var(--white);padding:64px 48px 32px;text-align:center;border-top:1px solid rgba(201,168,76,.1)}
footer .ft-logos{display:flex;justify-content:center;align-items:center;gap:32px;margin-bottom:32px;flex-wrap:wrap}
footer .ft-logos img{height:28px;opacity:.6;transition:opacity .3s}
footer .ft-logos img:hover{opacity:1}
footer .ft-text{font-size:.74rem;color:rgba(255,255,255,.4);letter-spacing:1.2px;font-weight:300}
footer .ft-text a{color:var(--accent);transition:color .3s}
footer .ft-text a:hover{color:var(--white)}

/* LIGHTBOX */
.lightbox{position:fixed;inset:0;background:rgba(6,10,20,.97);z-index:200;display:none;align-items:center;justify-content:center;padding:40px}
.lightbox.open{display:flex}
.lightbox img{max-width:92vw;max-height:88vh;object-fit:contain;box-shadow:0 40px 100px rgba(0,0,0,.7)}
.lb-close{position:absolute;top:32px;right:32px;width:48px;height:48px;background:rgba(255,255,255,.08);color:var(--white);border:1px solid rgba(255,255,255,.15);display:flex;align-items:center;justify-content:center;font-size:1.4rem;cursor:pointer;transition:all .3s}
.lb-close:hover{background:var(--accent);color:var(--primary);border-color:var(--accent)}
.lb-prev,.lb-next{position:absolute;top:50%;transform:translateY(-50%);width:56px;height:56px;background:rgba(255,255,255,.08);color:var(--white);border:1px solid rgba(255,255,255,.15);display:flex;align-items:center;justify-content:center;font-size:1.4rem;cursor:pointer;transition:all .3s}
.lb-prev{left:32px}.lb-next{right:32px}
.lb-prev:hover,.lb-next:hover{background:var(--accent);color:var(--primary);border-color:var(--accent)}
.lb-counter{position:absolute;bottom:32px;left:50%;transform:translateX(-50%);color:rgba(255,255,255,.6);font-size:.72rem;letter-spacing:2px;font-weight:500}

/* REVEAL */
.reveal{opacity:0;transform:translateY(40px);transition:all .9s cubic-bezier(.16,1,.3,1)}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal-delay-1{transition-delay:.15s}
.reveal-delay-2{transition-delay:.3s}

/* RESPONSIVE - intermediate desktop/tablet */
@media (max-width:1200px){
  .hero-inner{gap:60px}
  .intro-inner{gap:60px}
  .chapter-inner{gap:70px}
  .chapter-num{top:48px;right:32px;font-size:clamp(7rem,12vw,11rem)}
  .chapter:nth-child(odd) .chapter-num{left:32px}
}
@media (max-width:1100px){
  .hero{padding:100px 32px 80px}
  .hero-inner{grid-template-columns:1fr;gap:60px}
  .hero-right{max-width:520px;margin:0 auto;width:100%}
  .hero-cover-2{right:0}
  .intro{padding:100px 32px}
  .intro-inner{grid-template-columns:1fr;gap:40px}
  .chapter{padding:90px 32px}
  .chapter-inner{grid-template-columns:1fr;gap:50px;direction:ltr!important}
  .chapter:nth-child(odd) .chapter-inner{direction:ltr!important}
  .chapter-num{font-size:7rem;top:30px;right:20px;opacity:.5}
  .chapter:nth-child(odd) .chapter-num{left:20px}
  .side-nav{display:none}
  .top-nav,.top-nav.scrolled{padding:14px 24px}
  .cta-section{padding:100px 32px}
  .hero-meta{gap:24px}
  .tn-brand .tn-tag,.tn-brand .tn-sep:nth-of-type(2){display:none}
  .tn-brand img{height:30px;max-width:120px}
  .chapter-grid.c3,.chapter-grid.c4{grid-template-columns:repeat(2,1fr)}
  .chapter-visual-emoji{padding:70px 30px;font-size:5rem}
  .scroll-cue{display:none}
  footer{padding:48px 24px 24px}
}
@media (max-width:640px){
  .hero{padding:90px 22px 60px;min-height:auto}
  .hero-left h1,.hero-single h1{font-size:2.2rem}
  .hero-desc{font-size:.95rem}
  .hero-meta{gap:20px;padding-top:24px;margin-bottom:32px}
  .hero-meta-item .num{font-size:2rem}
  .hero-cover-2{display:none}
  .hero-emoji-card{padding:60px 30px;font-size:5rem}
  .intro{padding:70px 22px}
  .chapter{padding:70px 22px}
  .chapter-num{font-size:5rem;top:22px;right:14px}
  .chapter:nth-child(odd) .chapter-num{left:14px}
  .chapter h3{font-size:1.6rem}
  .chapter-visual-emoji{padding:60px 30px;font-size:4rem}
  .lb-prev{left:12px}.lb-next{right:12px}
  .lb-close{top:16px;right:16px}
  .chapter-grid.c2,.chapter-grid.c3,.chapter-grid.c4{grid-template-columns:1fr}
  .top-nav,.top-nav.scrolled{padding:12px 18px}
  .top-nav .tn-brand .tn-name{font-size:.68rem}
  .tn-back{font-size:.64rem}
  .cta-section{padding:70px 22px}
  .cta-section h2{font-size:1.8rem}
  .btn-primary,.btn-ghost{padding:14px 22px;font-size:.68rem}
  .hero-cta-row{gap:10px}
}