/* ================= TOKENS ================= */
:root{
  --bg:#070b1a; --bg-2:#0d1330;
  --surface:rgba(255,255,255,.055); --surface-2:rgba(255,255,255,.09);
  --border:rgba(255,255,255,.13);
  --text:#eef1ff; --muted:#a7b0cc;
  --primary:#ff8a3d; --primary-2:#ff4d6d;
  --secondary:#4cc9ff; --violet:#8b5cf6;
  --glow-p:rgba(255,138,61,.45); --glow-s:rgba(76,201,255,.4);
  --grad-hot:linear-gradient(90deg,#ff8a3d,#ff4d6d,#8b5cf6,#4cc9ff);
  --radius:18px;
  --font-head:'Sora',sans-serif; --font-body:'Inter',sans-serif;
  --shadow-card:0 18px 40px rgba(3,6,20,.55);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);background:var(--bg);color:var(--text);
  line-height:1.75;font-size:16.5px;overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--secondary);text-decoration:none}
a:hover{color:#8fdcff}
.container{max-width:1180px;margin:0 auto;padding:0 22px}
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}
section{scroll-margin-top:96px}
h2{scroll-margin-top:96px}

/* ================= BACKGROUND SCENE ================= */
.bg-scene{position:fixed;inset:0;z-index:-1;overflow:hidden;
  background:radial-gradient(1200px 700px at 85% -10%,#1a2150 0%,transparent 60%),
             radial-gradient(900px 600px at -10% 40%,#131b42 0%,transparent 55%),var(--bg);}
.orb{position:absolute;border-radius:50%;filter:blur(70px);opacity:.5;animation:drift 16s ease-in-out infinite alternate}
.orb-1{width:420px;height:420px;background:var(--primary);top:-140px;right:-120px;opacity:.22}
.orb-2{width:360px;height:360px;background:var(--violet);bottom:-120px;left:-140px;opacity:.2;animation-delay:-5s}
.orb-3{width:260px;height:260px;background:var(--secondary);top:40%;left:55%;opacity:.14;animation-delay:-9s}
@keyframes drift{from{transform:translate3d(0,0,0) scale(1)}to{transform:translate3d(-40px,50px,0) scale(1.12)}}
.grid-overlay{position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(ellipse 70% 55% at 50% 0%,#000 30%,transparent 75%);
  mask-image:radial-gradient(ellipse 70% 55% at 50% 0%,#000 30%,transparent 75%);}
.spark{position:absolute;width:5px;height:5px;border-radius:50%;background:var(--secondary);opacity:.5;animation:spark 9s linear infinite}
.s1{left:12%;top:22%}.s2{left:78%;top:30%;background:var(--primary);animation-delay:-2s}
.s3{left:60%;top:70%;animation-delay:-4s}.s4{left:30%;top:80%;background:var(--violet);animation-delay:-6s}
.s5{left:90%;top:60%;background:var(--primary);animation-delay:-3s}.s6{left:45%;top:12%;animation-delay:-7s}
@keyframes spark{0%,100%{transform:translate3d(0,0,0);opacity:.15}50%{transform:translate3d(14px,-26px,0);opacity:.7}}

/* ================= PROGRESS / HEADER ================= */
#progress{position:fixed;top:0;left:0;height:3px;width:0;z-index:120;
  background:var(--grad-hot);background-size:300% 100%;box-shadow:0 0 12px var(--glow-p)}
.site-header{position:fixed;top:0;left:0;right:0;z-index:110;
  background:rgba(7,11,26,.55);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;transition:background .3s,border-color .3s}
.site-header.scrolled{background:rgba(7,11,26,.85);border-color:var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:70px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--font-head);font-weight:800;font-size:19px;color:var(--text)}
.logo:hover{color:var(--text)}
.logo-mark{width:26px;height:26px;fill:var(--primary);filter:drop-shadow(0 0 8px var(--glow-p))}
.logo em{font-style:normal;background:var(--grad-hot);background-clip:text;-webkit-background-clip:text;color:transparent}
.main-nav{display:flex;align-items:center;gap:26px}
.main-nav a{color:var(--muted);font-weight:500;font-size:15px;position:relative}
.main-nav a:not(.btn):hover{color:var(--text)}
.main-nav a:not(.btn)::after{content:"";position:absolute;left:0;bottom:-6px;height:2px;width:0;background:var(--grad-hot);transition:width .3s}
.main-nav a:not(.btn):hover::after{width:100%}
.menu-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.menu-toggle span{width:24px;height:2.5px;background:var(--text);border-radius:2px;transition:transform .3s,opacity .3s}
.menu-toggle.open span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.menu-toggle.open span:nth-child(2){opacity:0}
.menu-toggle.open span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}

/* ================= BUTTONS ================= */
.btn{display:inline-flex;align-items:center;gap:9px;font-family:var(--font-head);font-weight:700;
  padding:14px 26px;border-radius:14px;font-size:15px;cursor:pointer;border:1px solid transparent;
  transition:transform .25s,box-shadow .25s,background-position .4s;position:relative}
.btn svg{width:17px;height:17px;fill:currentColor}
.btn-primary{color:#1a0d02;background:linear-gradient(100deg,var(--primary),var(--primary-2),var(--primary));
  background-size:220% 100%;box-shadow:0 8px 26px var(--glow-p)}
.btn-primary:hover{transform:translateY(-3px);background-position:100% 0;box-shadow:0 14px 34px var(--glow-p);color:#1a0d02}
.btn-ghost{color:var(--text);background:var(--surface);border-color:var(--border);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.btn-ghost:hover{transform:translateY(-3px);border-color:var(--secondary);box-shadow:0 10px 26px var(--glow-s);color:var(--text)}
.btn-small{padding:10px 18px;font-size:13.5px;border-radius:11px}

/* ================= HERO ================= */
.hero{position:relative;min-height:94vh;display:flex;flex-direction:column;justify-content:center;padding:130px 0 70px}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.badge{display:inline-flex;align-items:center;gap:9px;padding:8px 16px;border-radius:999px;
  background:var(--surface);border:1px solid var(--border);font-size:12.5px;font-weight:600;letter-spacing:.6px;
  text-transform:uppercase;color:var(--muted);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.pulse-dot{width:8px;height:8px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 0 var(--glow-p);animation:pulse 2s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 11px rgba(255,138,61,0)}100%{box-shadow:0 0 0 0 rgba(255,138,61,0)}}
.hero h1{font-size:clamp(2.5rem,5.6vw,4.3rem);font-weight:800;margin:22px 0 20px;letter-spacing:-1px}
.grad-text{background:var(--grad-hot);background-size:300% 100%;background-clip:text;-webkit-background-clip:text;color:transparent;animation:gradMove 6s linear infinite}
@keyframes gradMove{to{background-position:300% 0}}
.hero-intro{color:var(--muted);font-size:18px;max-width:560px;margin-bottom:30px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:26px}
.hero-meta{display:flex;gap:20px;flex-wrap:wrap;color:var(--muted);font-size:13.5px}
.hero-visual{position:relative;perspective:900px}
.house-svg{width:100%;max-width:480px;margin:0 auto;filter:drop-shadow(0 26px 46px rgba(0,0,0,.55));animation:floatY 7s ease-in-out infinite}
@keyframes floatY{0%,100%{transform:translate3d(0,0,0) rotateX(0)}50%{transform:translate3d(0,-16px,0) rotateX(2deg)}}
.ring{position:absolute;inset:6% 4%;border-radius:50%;
  background:conic-gradient(from 0deg,transparent 0 60%,var(--secondary) 78%,transparent 92%);
  -webkit-mask:radial-gradient(farthest-side,transparent calc(100% - 3px),#000 calc(100% - 2px));
  mask:radial-gradient(farthest-side,transparent calc(100% - 3px),#000 calc(100% - 2px));
  animation:spin 9s linear infinite;opacity:.7}
@keyframes spin{to{transform:rotate(360deg)}}
.win{animation:glowWin 3.4s ease-in-out infinite}
.w2{animation-delay:-1.7s}
@keyframes glowWin{0%,100%{opacity:1}50%{opacity:.55}}
.rain{stroke:var(--secondary);stroke-width:3;stroke-linecap:round;opacity:0;animation:rain 1.6s linear infinite}
.r2{animation-delay:.4s}.r3{animation-delay:.8s}.r4{animation-delay:1.1s}
@keyframes rain{0%{transform:translateY(-30px);opacity:0}25%{opacity:.8}100%{transform:translateY(120px);opacity:0}}
.chip{position:absolute;padding:9px 15px;border-radius:12px;background:var(--surface-2);border:1px solid var(--border);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);font-size:13px;font-weight:600;color:var(--text);
  box-shadow:var(--shadow-card);animation:floatY 5.5s ease-in-out infinite}
.chip-1{top:6%;left:2%}
.chip-2{top:38%;right:-2%;animation-delay:-2s}
.chip-3{bottom:8%;left:8%;animation-delay:-4s}
.scroll-indicator{position:absolute;left:50%;bottom:22px;transform:translateX(-50%)}
.mouse{display:block;width:26px;height:42px;border:2px solid var(--muted);border-radius:14px;position:relative;opacity:.8}
.wheel{position:absolute;left:50%;top:8px;width:4px;height:8px;background:var(--primary);border-radius:3px;transform:translateX(-50%);animation:wheel 1.6s ease-in-out infinite}
@keyframes wheel{0%{top:8px;opacity:1}100%{top:24px;opacity:0}}

/* ================= LAYOUT / TOC ================= */
.layout{display:grid;grid-template-columns:280px 1fr;gap:38px;align-items:start;padding-top:30px;padding-bottom:40px}
.toc{position:sticky;top:92px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);padding:20px;box-shadow:var(--shadow-card)}
.toc-head{display:none;width:100%;align-items:center;justify-content:space-between;background:none;border:0;
  color:var(--text);font-family:var(--font-head);font-weight:700;font-size:15px;cursor:pointer}
.toc-head svg{width:22px;height:22px;fill:var(--muted);transition:transform .3s}
.toc.open .toc-head svg{transform:rotate(180deg)}
.toc-list{list-style:none;display:flex;flex-direction:column;gap:4px;margin-top:4px}
.toc-list a{display:block;padding:8px 12px;border-radius:10px;color:var(--muted);font-size:14px;border-left:2px solid transparent;transition:all .25s}
.toc-list a:hover{color:var(--text);background:var(--surface-2);transform:translateX(4px)}
.toc-list a.active{color:var(--text);background:linear-gradient(90deg,rgba(255,138,61,.16),transparent);border-left-color:var(--primary);font-weight:600}

/* ================= ARTICLE ================= */
.post{max-width:780px}
.lead{font-size:19px;color:var(--text);background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:26px 28px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  box-shadow:var(--shadow-card);margin-bottom:38px}
.post section{margin-bottom:44px}
.post h2{font-size:clamp(1.5rem,3vw,2.05rem);font-weight:700;margin-bottom:18px;counter-increment:h2;position:relative;padding-left:58px}
.post{counter-reset:h2}
.post h2::before{content:counter(h2,decimal-leading-zero);position:absolute;left:0;top:2px;
  font-family:var(--font-head);font-size:15px;font-weight:800;width:42px;height:42px;display:grid;place-items:center;
  border-radius:12px;background:var(--surface-2);border:1px solid var(--border);color:var(--primary);
  box-shadow:0 0 16px rgba(255,138,61,.25) inset}
.post h3{font-size:1.12rem;margin:22px 0 12px;color:var(--secondary)}
.post p{color:var(--muted);margin-bottom:15px}
.post p strong,.post li strong{color:var(--text)}
.post a{font-weight:600;border-bottom:1px dashed var(--secondary)}
.post a:hover{border-bottom-style:solid}
.check-list{list-style:none;margin:0 0 16px;display:flex;flex-direction:column;gap:9px}
.check-list li{position:relative;padding-left:30px;color:var(--muted)}
.check-list li::before{content:"✓";position:absolute;left:0;top:0;width:20px;height:20px;border-radius:7px;
  display:grid;place-items:center;font-size:12px;font-weight:800;color:#04263a;
  background:linear-gradient(135deg,var(--secondary),#2f9ddf)}
.post-figure{margin:26px 0 8px;border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);
  box-shadow:var(--shadow-card);position:relative}
.post-figure img{width:100%;transition:transform .8s ease;transform:scale(1.001)}
.post-figure:hover img{transform:scale(1.05)}
.post-figure figcaption{position:absolute;inset:auto 0 0 0;padding:34px 18px 14px;font-size:13px;color:var(--text);
  background:linear-gradient(transparent,rgba(7,11,26,.92))}

/* cards / notes */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:var(--shadow-card);
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s;transform-style:preserve-3d;will-change:transform}
.card:hover{border-color:rgba(76,201,255,.4);box-shadow:0 26px 54px rgba(3,6,20,.7),0 0 24px rgba(76,201,255,.12)}
.steps-card{padding:26px 28px;margin:18px 0}
.step-list{list-style:none;counter-reset:st;display:flex;flex-direction:column;gap:14px}
.step-list li{counter-increment:st;position:relative;padding-left:52px;color:var(--muted)}
.step-list li::before{content:counter(st);position:absolute;left:0;top:0;width:36px;height:36px;border-radius:12px;
  display:grid;place-items:center;font-family:var(--font-head);font-weight:800;color:#fff;
  background:linear-gradient(135deg,var(--primary),var(--primary-2));box-shadow:0 6px 16px var(--glow-p)}
.note{border-radius:14px;padding:18px 20px;margin:18px 0;font-size:15px;color:var(--text);border:1px solid}
.note strong{color:inherit}
.note-tip{background:rgba(76,201,255,.09);border-color:rgba(76,201,255,.4);box-shadow:0 0 22px rgba(76,201,255,.12) inset}
.note-tip strong{color:var(--secondary)}
.note-warn{background:rgba(255,138,61,.1);border-color:rgba(255,138,61,.45);box-shadow:0 0 22px rgba(255,138,61,.14) inset}
.note-warn strong{color:var(--primary)}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:20px 0}
.compare{padding:24px}
.compare h3{margin:0 0 14px;color:var(--text);font-size:1.05rem}
.compare ul{list-style:none;display:flex;flex-direction:column;gap:9px;color:var(--muted);font-size:14.5px}
.compare ul li{padding-left:18px;position:relative}
.compare ul li::before{content:"";position:absolute;left:0;top:9px;width:8px;height:8px;border-radius:50%}
.compare-a{border-top:3px solid var(--secondary)}
.compare-a ul li::before{background:var(--secondary)}
.compare-b{border-top:3px solid var(--primary);background:linear-gradient(160deg,rgba(255,138,61,.12),var(--surface))}
.compare-b ul li::before{background:var(--primary)}
.takeaway-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:8px}
.take{padding:20px;text-align:left}
.take span{font-size:24px;display:block;margin-bottom:10px;filter:drop-shadow(0 0 10px var(--glow-s))}
.take h3{font-size:.98rem;margin:0 0 6px;color:var(--text)}
.take p{font-size:13.5px;margin:0;color:var(--muted)}

/* ================= BUSINESS CTA ================= */
.biz-wrap{padding-bottom:70px}
.biz-card{border-radius:24px;padding:1.5px;background:var(--grad-hot);background-size:300% 100%;animation:gradMove 8s linear infinite;box-shadow:0 24px 60px rgba(3,6,20,.7)}
.biz-inner{border-radius:23px;background:linear-gradient(160deg,#101736,#0b1026);padding:44px;display:grid;grid-template-columns:1.3fr .7fr;gap:36px}
.biz-copy h2{font-size:clamp(1.5rem,3vw,2.1rem);margin:16px 0 12px}
.biz-copy p{color:var(--muted);margin-bottom:24px}
.biz-actions{display:flex;flex-wrap:wrap;gap:12px}
.biz-facts{list-style:none;display:flex;flex-direction:column;gap:14px;align-self:center;
  background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:22px}
.biz-facts li{display:flex;flex-direction:column;font-size:14px;color:var(--muted)}
.biz-facts strong{font-size:11.5px;letter-spacing:.8px;text-transform:uppercase;color:var(--primary);margin-bottom:2px}
.biz-facts a{color:var(--text)}

/* ================= FOOTER / TO-TOP ================= */
.site-footer{border-top:1px solid var(--border);background:rgba(7,11,26,.7);padding:30px 0;backdrop-filter:blur(10px)}
.footer-inner{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;color:var(--muted);font-size:14px}
.foot-links{display:flex;gap:12px;align-items:center}
.to-top{position:fixed;right:22px;bottom:22px;width:50px;height:50px;border-radius:14px;border:1px solid var(--border);
  background:var(--surface-2);backdrop-filter:blur(10px);color:var(--text);font-size:19px;cursor:pointer;z-index:100;
  opacity:0;visibility:hidden;transform:translateY(16px);transition:all .3s;box-shadow:var(--shadow-card)}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--primary);color:var(--primary);box-shadow:0 0 22px var(--glow-p)}

/* ================= REVEAL ================= */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.reveal.visible{opacity:1;transform:none}

/* ================= RESPONSIVE ================= */
@media (max-width:1020px){
  .hero-inner{grid-template-columns:1fr;gap:34px}
  .hero-visual{max-width:440px;margin:0 auto}
  .layout{grid-template-columns:1fr}
  .toc{position:static}
  .toc-head{display:flex}
  .toc-list{display:none;margin-top:12px}
  .toc.open .toc-list{display:flex}
  .biz-inner{grid-template-columns:1fr;padding:32px}
}
@media (max-width:720px){
  .menu-toggle{display:flex}
  .main-nav{position:fixed;inset:70px 0 auto 0;flex-direction:column;align-items:flex-start;gap:16px;
    background:rgba(7,11,26,.97);padding:24px 26px 28px;border-bottom:1px solid var(--border);
    transform:translateY(-12px);opacity:0;visibility:hidden;transition:all .3s;backdrop-filter:blur(16px)}
  .main-nav.open{transform:none;opacity:1;visibility:visible}
  .compare-grid,.takeaway-grid{grid-template-columns:1fr}
  .takeaway-grid{grid-template-columns:1fr 1fr}
  .post h2{padding-left:0;padding-top:52px}
  .post h2::before{top:0}
  .hero{padding-top:110px}
}
@media (max-width:520px){
  .takeaway-grid{grid-template-columns:1fr}
  .hero-cta .btn{width:100%;justify-content:center}
  .chip-2{right:0}
}

/* ================= REDUCED MOTION ================= */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}