/* === LongVerse AI — "The Infinite Manuscript" === */
:root {
  --ink: #0a0a0f;
  --surface: #14141f;
  --card-bg: #1a1a28;
  --gold: #c9a76a;
  --gold-light: #e8c88a;
  --gold-glow: #d4a853;
  --sienna: #c75c3a;
  --text: #e8e0d4;
  --text-dim: #9a9286;
  --serif: "Palatino Linotype","Book Antiqua",Palatino,serif;
  --sans: "Segoe UI",Avenir,"Helvetica Neue",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--ink);color:var(--text);font-family:var(--sans);overflow-x:hidden;line-height:1.6}

/* Grain overlay */
.grain-overlay{position:fixed;inset:0;pointer-events:none;z-index:9999;opacity:.04;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}

/* Golden thread */
.golden-thread{position:fixed;left:50%;top:0;width:1px;height:100vh;
  background:linear-gradient(to bottom,transparent,var(--gold) 30%,var(--gold) 70%,transparent);
  opacity:.1;z-index:1;pointer-events:none}

/* ---- HERO ---- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;
  cursor:crosshair;overflow:hidden}
.hero-glow{position:absolute;width:600px;height:600px;top:50%;left:50%;
  transform:translate(-50%,-50%);border-radius:50%;
  background:radial-gradient(circle,rgba(201,167,106,.08) 0%,transparent 70%);pointer-events:none}
.hero-content{text-align:center;z-index:2;padding:0 1.5rem}
.brand-name{font-family:var(--serif);font-size:clamp(2.8rem,7vw,5.5rem);font-weight:400;
  letter-spacing:.06em;color:var(--gold);opacity:0;animation:riseIn .9s ease-out .2s forwards}
.brand-stroke{width:0;height:2px;margin:0.8rem auto;
  background:linear-gradient(90deg,transparent,var(--gold),transparent);
  animation:strokeDraw 1s ease-out .8s forwards}
.slogan{font-family:var(--serif);font-style:italic;font-size:clamp(1.1rem,2.5vw,1.6rem);
  color:var(--text);min-height:1.8em;margin-top:.4rem}
.sub-desc{color:var(--text-dim);font-size:.95rem;margin-top:1rem;opacity:0;
  animation:fadeUp .8s ease-out 3s forwards}

/* Embers */
.embers{position:absolute;inset:0;pointer-events:none;z-index:1}
.embers span{position:absolute;width:3px;height:3px;border-radius:50%;background:var(--gold);
  opacity:0;animation:ember 6s ease-in-out infinite}
.embers span:nth-child(1){left:15%;animation-delay:0s}
.embers span:nth-child(2){left:28%;animation-delay:.8s}
.embers span:nth-child(3){left:42%;animation-delay:1.6s}
.embers span:nth-child(4){left:55%;animation-delay:2.4s}
.embers span:nth-child(5){left:70%;animation-delay:3.2s}
.embers span:nth-child(6){left:82%;animation-delay:4s}
.embers span:nth-child(7){left:35%;animation-delay:.4s}
.embers span:nth-child(8){left:60%;animation-delay:1.2s}
.embers span:nth-child(9){left:20%;animation-delay:2s}
.embers span:nth-child(10){left:75%;animation-delay:2.8s}

/* ---- FEATURES ---- */
.features{padding:6rem 1.5rem;max-width:1080px;margin:0 auto;position:relative;z-index:2}
.section-title{text-align:center;font-family:var(--serif);font-size:1.6rem;color:var(--gold);
  letter-spacing:.08em;margin-bottom:3.5rem}
.cards-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:2rem}
.card{position:relative;background:var(--card-bg);border:1px solid rgba(201,167,106,.1);
  border-radius:6px;padding:2.2rem 1.8rem 2rem;overflow:hidden;
  opacity:0;transform:translateY(30px);transition:opacity .6s ease-out,transform .6s ease-out}
.card.visible{opacity:1;transform:translateY(0)}
.card-accent{position:absolute;top:0;left:0;width:0;height:2px;background:var(--gold);
  transition:width .4s ease}
.card:hover .card-accent{width:100%}
.card-fold{position:absolute;top:0;right:0;width:0;height:0;
  border-style:solid;border-width:0 28px 28px 0;
  border-color:transparent var(--ink) transparent transparent;opacity:.6}
.card-icon{font-size:1.8rem;color:var(--gold);margin-bottom:.8rem}
.card h3{font-family:var(--serif);font-size:1.25rem;color:var(--gold-light);margin-bottom:.6rem}
.card p{color:var(--text-dim);font-size:.92rem;line-height:1.7}

/* ---- CTA ---- */
.cta-section{text-align:center;padding:5rem 1.5rem 4rem;position:relative;z-index:2}
.cta-quote{font-family:var(--serif);font-style:italic;font-size:clamp(1rem,2vw,1.25rem);
  color:var(--text-dim);border:none;max-width:460px;margin:0 auto 2.5rem;line-height:1.8}
.cta-btn{display:inline-block;padding:.85rem 2.6rem;font-family:var(--serif);font-size:1.05rem;
  color:var(--ink);background:var(--gold);border:none;border-radius:4px;text-decoration:none;
  letter-spacing:.04em;cursor:pointer;animation:glowPulse 2.5s ease-in-out infinite;
  transition:background .3s}
.cta-btn:hover{background:var(--gold-light)}
.cta-sub{color:var(--text-dim);font-size:.82rem;margin-top:1.2rem}

/* ---- FOOTER ---- */
.site-footer{text-align:center;padding:2.5rem 1rem;border-top:1px solid rgba(201,167,106,.08);
  color:var(--text-dim);font-size:.78rem;position:relative;z-index:2}

/* ---- KEYFRAMES ---- */
@keyframes riseIn{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes strokeDraw{from{width:0}to{width:min(320px,60vw)}}
@keyframes fadeUp{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}
@keyframes ember{
  0%{bottom:10%;opacity:0;transform:translateX(0)}
  20%{opacity:.7}
  50%{opacity:.4;transform:translateX(15px)}
  80%{opacity:.15}
  100%{bottom:85%;opacity:0;transform:translateX(-10px)}}
@keyframes glowPulse{
  0%,100%{box-shadow:0 0 8px rgba(201,167,106,.3)}
  50%{box-shadow:0 0 22px rgba(201,167,106,.55)}}

/* Responsive */
@media(max-width:640px){
  .cards-grid{grid-template-columns:1fr}
  .hero-glow{width:340px;height:340px}
}