/* ============ THEME ============ */
:root{
  --primary:#ff8a3d;        /* ember orange */
  --primary-2:#ffb86b;
  --secondary:#38bdf8;      /* sky cyan */
  --accent:#8b5cf6;         /* violet */
  --danger:#ff5d73;
  --background:#070b16;     /* deep dusk navy */
  --background-2:#0c1428;
  --surface:rgba(148,180,255,.06);
  --line:rgba(148,180,255,.16);
  --text:#eef4ff;
  --muted:#a7b4cc;
  --card-bg:rgba(12,20,40,.78);
  --grad:linear-gradient(120deg,var(--primary),var(--danger) 45%,var(--accent));
  --grad-cool:linear-gradient(120deg,var(--secondary),var(--accent));
  --radius:18px;
  --font-head:'Sora',system-ui,sans-serif;
  --font-body:'Inter',system-ui,sans-serif;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:96px}
html,body{overflow-x:clip}
body{
  font-family:var(--font-body);background:var(--background);color:var(--text);
  font-size:16.5px;line-height:1.75;-webkit-font-smoothing:antialiased;
}
::selection{background:rgba(255,138,61,.35);color:#fff}
img{max-width:100%;height:auto;display:block}
a{color:var(--secondary);text-decoration:none}
.article a{color:var(--secondary);border-bottom:1px solid rgba(56,189,248,.4);transition:color .25s,border-color .25s}
.article a:hover{color:var(--primary-2);border-color:var(--primary-2)}
h1,h2,h3{font-family:var(--font-head);line-height:1.2}
:focus-visible{outline:2px solid var(--secondary);outline-offset:3px;border-radius:4px}
.wrap{width:min(1160px,92%);margin:0 auto}
.skip-link{position:absolute;left:-999px;top:0;background:var(--primary);color:#081018;padding:10px 18px;border-radius:0 0 10px 10px;z-index:200;font-weight:600}
.skip-link:focus{left:12px}

/* ============ BACKGROUND ORBS / PROGRESS ============ */
.bg-orbs{position:fixed;inset:0;pointer-events:none;z-index:-1;overflow:hidden}
.orb{position:absolute;border-radius:50%;filter:blur(90px);opacity:.32;animation:drift 26s ease-in-out infinite alternate}
.o1{width:520px;height:520px;background:var(--accent);top:-160px;left:-140px}
.o2{width:460px;height:460px;background:var(--primary);top:38%;right:-180px;animation-delay:-8s}
.o3{width:420px;height:420px;background:var(--secondary);bottom:-160px;left:22%;animation-delay:-16s}
@keyframes drift{from{transform:translate3d(0,0,0) scale(1)}to{transform:translate3d(60px,40px,0) scale(1.12)}}
.progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:120;pointer-events:none}
#progressBar{display:block;height:100%;width:100%;background:var(--grad);transform-origin:0 50%;transform:scaleX(0)}

/* ============ HEADER ============ */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;transition:background .35s,box-shadow .35s,backdrop-filter .35s;border-bottom:1px solid transparent}
.site-header.scrolled{background:rgba(7,11,22,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-color:var(--line);box-shadow:0 10px 30px -18px rgba(0,0,0,.8)}
.header-inner{display:flex;align-items:center;gap:22px;height:72px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-head);font-weight:700;font-size:1.06rem;color:var(--text);margin-right:auto}
.brand svg{width:30px;height:30px;filter:drop-shadow(0 0 8px rgba(255,138,61,.55))}
.brand em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.main-nav{display:flex;gap:6px}
.main-nav a{color:var(--muted);font-weight:500;font-size:.94rem;padding:8px 13px;border-radius:10px;position:relative;transition:color .25s,background .25s}
.main-nav a:hover{color:var(--text);background:var(--surface)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:42px;height:42px;flex-direction:column;justify-content:center;gap:6px;align-items:center;border-radius:10px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--text);border-radius:2px;transition:transform .3s,opacity .3s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(8px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}

/* ============ BUTTONS ============ */
.btn{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-head);font-weight:600;font-size:.95rem;padding:13px 24px;border-radius:14px;border:1px solid transparent;cursor:pointer;transition:transform .3s,box-shadow .3s,background-position .5s,border-color .3s;position:relative}
.btn svg{width:17px;height:17px;flex:none}
.btn-primary{color:#160b02;background:linear-gradient(120deg,var(--primary),var(--danger) 60%,var(--primary)) 0 0/200% 100%;box-shadow:0 8px 24px -10px rgba(255,138,61,.65),0 0 0 1px rgba(255,138,61,.35) inset}
.btn-primary:hover{transform:translateY(-3px);background-position:100% 0;box-shadow:0 14px 34px -10px rgba(255,93,115,.7),0 0 22px rgba(255,138,61,.35)}
.btn-ghost{color:var(--text);background:var(--surface);border-color:var(--line);backdrop-filter:blur(8px)}
.btn-ghost:hover{transform:translateY(-3px);border-color:rgba(56,189,248,.55);box-shadow:0 10px 28px -12px rgba(56,189,248,.45)}
.btn-small{padding:9px 16px;font-size:.86rem;border-radius:11px}

/* ============ HERO ============ */
.hero{position:relative;min-height:100svh;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:130px 0 90px;overflow:hidden}
.hero-grid{position:absolute;left:50%;bottom:-2px;width:160%;height:44%;transform:translateX(-50%) perspective(700px) rotateX(62deg);transform-origin:50% 0;
  background:
   repeating-linear-gradient(90deg,rgba(56,189,248,.16) 0 1px,transparent 1px 60px),
   repeating-linear-gradient(0deg,rgba(139,92,246,.18) 0 1px,transparent 1px 60px);
  -webkit-mask-image:linear-gradient(to top,rgba(0,0,0,.9),transparent 85%);mask-image:linear-gradient(to top,rgba(0,0,0,.9),transparent 85%);
  animation:gridMove 3.2s linear infinite}
@keyframes gridMove{to{background-position:0 60px,0 60px}}
#particles{position:absolute;inset:0;pointer-events:none}
#particles span{position:absolute;bottom:-12px;border-radius:50%;animation:rise linear infinite}
@keyframes rise{0%{transform:translate3d(0,0,0);opacity:0}12%{opacity:var(--o)}88%{opacity:var(--o)}100%{transform:translate3d(var(--x),-72vh,0);opacity:0}}
.float-shape{position:absolute;width:64px;height:64px;border-radius:18px;display:grid;place-items:center;color:var(--secondary);
  background:linear-gradient(var(--card-bg),var(--card-bg)) padding-box,linear-gradient(135deg,rgba(255,138,61,.5),rgba(56,189,248,.5)) border-box;
  border:1px solid transparent;box-shadow:0 18px 40px -18px rgba(0,0,0,.8),0 0 24px -6px rgba(56,189,248,.35);
  animation:bob 6s ease-in-out infinite alternate;backdrop-filter:blur(6px)}
.float-shape svg{width:26px;height:26px}
.fs1{top:22%;left:9%;color:var(--primary-2);animation-delay:-1s;transform:rotate(-8deg)}
.fs2{top:30%;right:8%;animation-delay:-3s}
.fs3{bottom:24%;left:14%;color:var(--accent);animation-delay:-5s;transform:rotate(9deg)}
@keyframes bob{from{translate:0 0}to{translate:0 -22px}}
.hero-inner{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center;gap:26px}
.tag{display:inline-flex;align-items:center;gap:9px;font-size:.8rem;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--primary-2);background:var(--surface);border:1px solid var(--line);padding:8px 16px;border-radius:999px;backdrop-filter:blur(8px)}
.tag i{width:7px;height:7px;border-radius:50%;background:var(--primary);box-shadow:0 0 10px var(--primary);animation:pulse 2s ease-in-out infinite}
@keyframes pulse{50%{transform:scale(1.5);opacity:.6}}
h1{font-size:clamp(2.3rem,6vw,4.3rem);font-weight:800;letter-spacing:-.02em;max-width:16ch;text-shadow:0 20px 60px rgba(0,0,0,.6)}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 0 22px rgba(255,138,61,.4))}
.hero-intro{max-width:62ch;color:var(--muted);font-size:clamp(1rem,1.6vw,1.15rem)}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
.hero-meta{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.chip{display:inline-flex;align-items:baseline;gap:8px;font-size:.85rem;color:var(--muted);background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:9px 16px;backdrop-filter:blur(8px);transition:transform .3s,border-color .3s}
.chip:hover{transform:translateY(-4px);border-color:rgba(255,138,61,.5)}
.chip strong{font-family:var(--font-head);font-size:1.05rem;background:var(--grad-cool);-webkit-background-clip:text;background-clip:text;color:transparent}
.scroll-indicator{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:2}
.mouse{display:block;width:26px;height:42px;border:2px solid rgba(238,244,255,.4);border-radius:14px;position:relative;transition:border-color .3s}
.mouse::after{content:"";position:absolute;top:7px;left:50%;width:4px;height:8px;margin-left:-2px;border-radius:3px;background:var(--primary);box-shadow:0 0 10px var(--primary);animation:wheel 1.8s ease-in-out infinite}
@keyframes wheel{0%{transform:translateY(0);opacity:1}70%{transform:translateY(14px);opacity:0}100%{opacity:0}}
.scroll-indicator:hover .mouse{border-color:var(--primary)}

/* ============ LAYOUT / TOC ============ */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:48px;padding:70px 0 30px;align-items:start}
.toc{position:sticky;top:96px;order:2;border-radius:var(--radius);padding:22px;
  background:linear-gradient(var(--card-bg),var(--card-bg)) padding-box,linear-gradient(160deg,rgba(255,138,61,.4),rgba(56,189,248,.3)) border-box;
  border:1px solid transparent;box-shadow:0 20px 50px -30px rgba(0,0,0,.9)}
.toc-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.toc-title{display:flex;align-items:center;gap:8px;font-family:var(--font-head);font-weight:700;font-size:.92rem;letter-spacing:.06em;text-transform:uppercase;color:var(--primary-2)}
.toc-title svg{width:16px;height:16px}
.toc-toggle{display:none;background:var(--surface);border:1px solid var(--line);color:var(--text);border-radius:9px;padding:6px 12px;font-size:.8rem;cursor:pointer}
.toc-list{list-style:none;display:flex;flex-direction:column;gap:2px;max-height:70vh;overflow:auto;scrollbar-width:thin}
.toc-list a{display:block;padding:8px 12px 8px 16px;border-left:2px solid var(--line);color:var(--muted);font-size:.9rem;border-radius:0 9px 9px 0;transition:color .25s,border-color .25s,background .25s,transform .25s}
.toc-list a:hover{color:var(--text);border-color:var(--secondary);background:var(--surface);transform:translateX(3px)}
.toc-list a.active{color:var(--text);border-color:var(--primary);background:linear-gradient(90deg,rgba(255,138,61,.14),transparent);font-weight:600}
.article{order:1;min-width:0}

/* ============ ARTICLE ============ */
.article{counter-reset:sec}
.sec{margin-bottom:64px}
.article h2{counter-increment:sec;font-size:clamp(1.45rem,3vw,2.05rem);font-weight:700;letter-spacing:-.01em;margin-bottom:22px;display:flex;align-items:flex-start;gap:14px}
.article h2::before{content:counter(sec,decimal-leading-zero);flex:none;font-family:var(--font-head);font-size:.85em;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;padding-top:.12em;filter:drop-shadow(0 0 12px rgba(255,138,61,.45))}
.article p{color:var(--muted);margin-bottom:18px}
.article p strong,.article li strong{color:var(--text)}
figure{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:0 26px 60px -30px rgba(0,0,0,.9);margin:28px 0;position:relative}
figure img{width:100%;transition:transform .8s cubic-bezier(.2,.7,.2,1)}
figure:hover img{transform:scale(1.05)}
figure::after{content:"";position:absolute;inset:0;background:linear-gradient(to top,rgba(7,11,22,.55),transparent 40%);pointer-events:none}
figcaption{position:absolute;bottom:0;left:0;right:0;padding:14px 18px;font-size:.85rem;color:#dbe6ff;z-index:2}

/* cards */
.cards{display:grid;gap:18px;perspective:1200px;margin:26px 0}
.stats{grid-template-columns:repeat(3,1fr)}
.mats{grid-template-columns:repeat(3,1fr)}
.card3d{border:1px solid transparent;border-radius:var(--radius);padding:24px;
  background:linear-gradient(var(--card-bg),var(--card-bg)) padding-box,linear-gradient(150deg,rgba(255,138,61,.45),rgba(56,189,248,.28) 55%,rgba(139,92,246,.45)) border-box;
  box-shadow:0 16px 40px -22px rgba(0,0,0,.85);transition:transform .35s,box-shadow .35s;will-change:transform}
.card3d:hover{transform:translateY(-8px) rotateX(2deg) rotateY(-2deg);box-shadow:0 26px 55px -22px rgba(0,0,0,.9),0 0 30px -6px rgba(255,138,61,.28)}
.stats .card3d{text-align:center;display:flex;flex-direction:column;gap:6px;justify-content:center}
.stats strong{font-family:var(--font-head);font-size:1.7rem;font-weight:800;background:var(--grad-cool);-webkit-background-clip:text;background-clip:text;color:transparent}
.stats span{font-size:.86rem;color:var(--muted)}
.icon-chip{display:inline-grid;place-items:center;width:46px;height:46px;border-radius:13px;margin-bottom:14px;color:var(--primary-2);background:linear-gradient(135deg,rgba(255,138,61,.2),rgba(139,92,246,.2));border:1px solid var(--line);box-shadow:0 0 18px -4px rgba(255,138,61,.4)}
.icon-chip svg{width:22px;height:22px}
.card3d h3{font-size:1.08rem;margin-bottom:10px}
.card3d p{font-size:.92rem;margin:0}

/* lists */
.signs-grid{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:22px 0}
.signs-grid li{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 16px 14px 42px;position:relative;font-size:.94rem;color:var(--muted);transition:transform .3s,border-color .3s,box-shadow .3s}
.signs-grid li::before{content:"";position:absolute;left:16px;top:18px;width:10px;height:10px;background:var(--grad);transform:rotate(45deg);border-radius:2px;box-shadow:0 0 12px rgba(255,138,61,.6)}
.signs-grid li:hover{transform:translateY(-4px);border-color:rgba(255,138,61,.45);box-shadow:0 14px 30px -18px rgba(255,138,61,.4)}
.steps{list-style:none;counter-reset:step;position:relative;margin:26px 0}
.steps li{counter-increment:step;position:relative;padding:0 0 26px 62px}
.steps li::before{content:counter(step,decimal-leading-zero);position:absolute;left:0;top:0;width:42px;height:42px;display:grid;place-items:center;font-family:var(--font-head);font-weight:800;font-size:.9rem;color:#160b02;background:linear-gradient(135deg,var(--primary),var(--primary-2));border-radius:13px;box-shadow:0 0 20px -2px rgba(255,138,61,.55);transform:rotate(-4deg)}
.steps li:not(:last-child)::after{content:"";position:absolute;left:20px;top:48px;bottom:4px;width:2px;background:linear-gradient(to bottom,rgba(255,138,61,.5),rgba(56,189,248,.15))}
.steps strong{display:block;font-family:var(--font-head);font-size:1.02rem;margin-bottom:5px;color:var(--text)}
.steps p{font-size:.94rem;margin:0}
.pills{list-style:none;display:flex;flex-wrap:wrap;gap:10px;margin:22px 0}
.pills li{padding:9px 17px;border-radius:999px;font-size:.88rem;font-weight:500;color:var(--text);background:var(--surface);border:1px solid var(--line);transition:transform .3s,border-color .3s,box-shadow .3s}
.pills li:hover{transform:translateY(-4px);border-color:rgba(56,189,248,.55);box-shadow:0 8px 22px -10px rgba(56,189,248,.5)}
.checklist,.badlist{list-style:none;margin:22px 0;display:flex;flex-direction:column;gap:12px}
.checklist li,.badlist li{padding:13px 16px 13px 50px;position:relative;border-radius:14px;font-size:.95rem;color:var(--muted)}
.checklist li{background:var(--surface);border:1px solid var(--line)}
.checklist li::before{content:"\2713";position:absolute;left:14px;top:12px;width:26px;height:26px;display:grid;place-items:center;border-radius:9px;color:#04121f;font-weight:800;background:var(--grad-cool);box-shadow:0 0 14px -2px rgba(56,189,248,.6)}
.badlist li{background:rgba(255,93,115,.07);border:1px solid rgba(255,93,115,.28)}
.badlist li::before{content:"\2715";position:absolute;left:14px;top:12px;width:26px;height:26px;display:grid;place-items:center;border-radius:9px;color:#20060b;font-weight:800;background:linear-gradient(135deg,var(--danger),var(--primary));box-shadow:0 0 14px -2px rgba(255,93,115,.6)}

/* callouts */
.tipbox,.notebox,.takeaway{border-radius:var(--radius);padding:20px 22px;margin:24px 0;font-size:.96rem;color:var(--muted);border:1px solid;position:relative;overflow:hidden}
.tipbox{border-color:rgba(56,189,248,.4);background:linear-gradient(120deg,rgba(56,189,248,.1),rgba(139,92,246,.08));box-shadow:0 0 34px -12px rgba(56,189,248,.45)}
.notebox{border-color:rgba(255,138,61,.45);background:linear-gradient(120deg,rgba(255,138,61,.12),rgba(255,93,115,.08));box-shadow:0 0 34px -12px rgba(255,138,61,.5)}
.takeaway{border-color:rgba(139,92,246,.45);background:linear-gradient(120deg,rgba(139,92,246,.12),rgba(56,189,248,.08));box-shadow:0 0 34px -12px rgba(139,92,246,.5)}
.tipbox strong,.notebox strong{color:var(--text)}
.takeaway ul{list-style:none;display:flex;flex-direction:column;gap:11px}
.takeaway li{padding-left:26px;position:relative}
.takeaway li::before{content:"";position:absolute;left:2px;top:.62em;width:9px;height:9px;border-radius:50%;background:var(--grad-cool);box-shadow:0 0 10px rgba(56,189,248,.7)}

/* ============ CTA ============ */
.cta-wrap{padding:30px 0 80px}
.cta-card{position:relative;border:1px solid transparent;border-radius:26px;padding:clamp(30px,5vw,56px);text-align:center;overflow:hidden;
  background:linear-gradient(var(--card-bg),var(--card-bg)) padding-box,linear-gradient(135deg,rgba(255,138,61,.55),rgba(56,189,248,.4) 50%,rgba(139,92,246,.55)) border-box;
  box-shadow:0 40px 90px -40px rgba(0,0,0,.95);transition:transform .4s,box-shadow .4s}
.cta-card:hover{transform:translateY(-6px) rotateX(1.5deg);box-shadow:0 50px 100px -40px rgba(0,0,0,.95),0 0 50px -12px rgba(255,138,61,.3)}
.cta-glow{position:absolute;inset:0;background:radial-gradient(600px 260px at 50% -10%,rgba(255,138,61,.22),transparent 70%);pointer-events:none}
.cta-card h2{font-size:clamp(1.5rem,3.4vw,2.3rem);margin:18px 0 14px}
.cta-card>p{color:var(--muted);max-width:56ch;margin:0 auto 28px}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.cta-loc{display:inline-flex;align-items:center;gap:8px;margin-top:26px;font-size:.9rem;color:var(--muted)}
.cta-loc svg{width:16px;height:16px;color:var(--primary-2)}

/* ============ FOOTER ============ */
.site-footer{border-top:1px solid var(--line);padding:30px 0;background:rgba(7,11,22,.6)}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;font-size:.9rem;color:var(--muted)}
.footer-nav{display:flex;gap:20px;flex-wrap:wrap}
.footer-nav a{color:var(--muted);transition:color .25s}
.footer-nav a:hover{color:var(--primary-2)}

/* ============ REVEAL ============ */
.reveal{opacity:0;transform:translateY(26px)}
.reveal.in{opacity:1;transform:none;transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1)}

/* ============ RESPONSIVE ============ */
@media (max-width:1000px){
  .layout{grid-template-columns:1fr;gap:26px}
  .toc{order:0;position:static}
  .toc-list{max-height:0;overflow:hidden;transition:max-height .45s ease}
  .toc.open .toc-list{max-height:420px;overflow:auto}
  .toc-toggle{display:block}
  .mats{grid-template-columns:1fr}
  .stats{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:720px){
  .main-nav{position:fixed;top:72px;right:0;left:0;flex-direction:column;padding:18px 5%;gap:4px;background:rgba(7,11,22,.92);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);transform:translateY(-130%);transition:transform .4s cubic-bezier(.2,.7,.2,1);z-index:-1}
  .main-nav.open{transform:translateY(0)}
  .nav-toggle{display:flex}
  .signs-grid{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr}
  .fs3{display:none}
  .header-cta span{display:none}
  .header-cta{padding:10px 12px}
}
/* ============ REDUCED MOTION ============ */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  .reveal{opacity:1;transform:none}
  #particles{display:none}
}