:root{
    --night:#081A33;
    --night-2:#0B2447;
    --ink:#0B1F3A;
    --blue:#2E6BFF;
    --blue-soft:#6E9BFF;
    --orange:#FF8A3D;
    --green:#169B62;
    --sand:#F6F1E7;
    --white:#FFFFFF;
    --glass:rgba(255,255,255,.08);
    --glass-brd:rgba(255,255,255,.16);
    --radius:18px;
    --font-display:'Alexandria',sans-serif;
    --font-body:'Readex Pro',sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);background:var(--night);color:var(--white);overflow-x:hidden;line-height:1.8}
h1,h2,h3{font-family:var(--font-display);line-height:1.4}
::selection{background:var(--orange);color:var(--night)}

/* ---------- NAV ---------- */
.nav{position:fixed;inset-inline:0;top:0;z-index:60;display:flex;align-items:center;justify-content:space-between;
    padding:14px 5vw;backdrop-filter:blur(14px);background:rgba(8,26,51,.55);border-bottom:1px solid rgba(255,255,255,.06)}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:1.25rem}
.brand .dot{width:12px;height:12px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--orange));box-shadow:0 0 14px var(--blue)}
.brand small{color:var(--blue-soft);font-weight:600;font-size:.7rem;letter-spacing:.5px}
.nav a.cta-mini{font-size:.85rem;font-weight:600;color:var(--night);background:var(--orange);padding:8px 18px;border-radius:999px;text-decoration:none;transition:.25s}
.nav a.cta-mini:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(255,138,61,.4)}

/* ---------- HERO ---------- */
.hero{position:relative;margin:0;padding:0;height:100svh;min-height:640px;overflow:hidden}
#scene{position:absolute;inset:0;display:block}
#scene{width:100%;height:100%}
#hud{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.tag3d{position:absolute;transform:translate(-50%,-98%) scale(.92);pointer-events:none;display:inline-flex;align-items:center;gap:8px;
    font-size:.84rem;font-weight:700;padding:10px 16px;border-radius:var(--radius);white-space:nowrap;
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.16);
    box-shadow:0 14px 34px rgba(0,0,0,.18);transition:background .45s ease,border-color .45s ease,color .45s ease,box-shadow .45s ease,transform .45s ease,opacity .45s ease;
    opacity:0}
@keyframes tagPulse{0%{transform:translate(-50%,-110%) scale(1)}45%{transform:translate(-50%,-110%) scale(1.06)}100%{transform:translate(-50%,-110%) scale(1)}}
.tag3d.show{opacity:1;transform:translate(-50%,-110%) scale(1)}
.tag3d.bad{background:rgba(214,48,49,.18);border-color:rgba(255,107,107,.36);color:#FFE0E0;box-shadow:0 12px 28px rgba(214,48,49,.18)}
.tag3d.good{background:rgba(22,155,98,.18);border-color:rgba(86,224,160,.36);color:#E4FFF0;box-shadow:0 12px 28px rgba(22,155,98,.18)}
.tag3d.focus{opacity:1;transform:translate(-50%,-110%) scale(1.12);box-shadow:0 18px 44px rgba(0,0,0,.28),0 0 0 1px rgba(255,255,255,.18),0 0 26px rgba(110,155,255,.28);animation:tagPulse .65s ease-out}
.tag3d.dim{opacity:.38;filter:saturate(.72)}
.tag3d .ic{display:none}
.tag3d .txt{display:inline-flex;align-items:center;gap:8px}
.tagMark{width:12px;height:12px;border-radius:50%;display:inline-block;flex:none;box-shadow:inset 0 0 0 1px rgba(255,255,255,.16),0 0 0 4px rgba(255,255,255,.04);transition:background .45s ease,box-shadow .45s ease,transform .45s ease}
.tagMark.bad{background:rgba(214,48,49,.95);box-shadow:0 0 0 4px rgba(214,48,49,.12),inset 0 0 0 1px rgba(255,255,255,.1)}
.tagMark.good{background:rgba(22,155,98,.98);box-shadow:0 0 0 4px rgba(22,155,98,.12),inset 0 0 0 1px rgba(255,255,255,.1)}

.hero-veil{position:absolute;inset:0;pointer-events:none;
    background:linear-gradient(to top, var(--night) 0%, rgba(8,26,51,.55) 28%, rgba(8,26,51,0) 60%)}
.hero-copy{position:absolute;inset-inline:0;bottom:0;z-index:10;padding:0 5vw 56px;max-width:880px;margin-inline:auto;text-align:center;
    inset-inline-start:0;inset-inline-end:0}
.sera-bubble{position:absolute;z-index:18;min-width:240px;max-width:320px;padding:12px 16px 13px;border-radius:22px;
    background:linear-gradient(180deg,rgba(255,255,255,.16),rgba(255,255,255,.08));border:1px solid rgba(255,255,255,.18);
    box-shadow:0 16px 40px rgba(0,0,0,.24);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    color:#fff;opacity:0;transform:translate(-50%,-18px) scale(.96);pointer-events:none;transition:opacity .28s ease,transform .28s ease,background .28s ease,border-color .28s ease,box-shadow .28s ease}
.sera-bubble::after{content:"";position:absolute;left:50%;bottom:-10px;width:18px;height:18px;transform:translateX(-50%) rotate(45deg);
    background:inherit;border-right:1px solid rgba(255,255,255,.12);border-bottom:1px solid rgba(255,255,255,.12)}
.sera-bubble.show{opacity:1;transform:translate(-50%,0) scale(1)}
.sera-bubble.problem{background:linear-gradient(180deg,rgba(255,138,61,.18),rgba(255,255,255,.08));border-color:rgba(255,138,61,.26);box-shadow:0 16px 40px rgba(255,138,61,.14),0 12px 34px rgba(0,0,0,.2)}
.sera-bubble.solution{background:linear-gradient(180deg,rgba(22,155,98,.18),rgba(255,255,255,.08));border-color:rgba(86,224,160,.26);box-shadow:0 16px 40px rgba(22,155,98,.14),0 12px 34px rgba(0,0,0,.2)}
.sera-bubble .label{display:inline-flex;align-items:center;gap:8px;font-size:.76rem;font-weight:700;letter-spacing:.2px;margin-bottom:6px;color:rgba(255,255,255,.78)}
.sera-bubble .label .ic{width:18px;height:18px;border-radius:50%;display:grid;place-items:center;font-size:.62rem;flex:none;background:rgba(255,255,255,.14)}
.sera-bubble.problem .label .ic{background:rgba(255,138,61,.9)}
.sera-bubble.solution .label .ic{background:rgba(22,155,98,.95)}
.sera-bubble .msg{font-size:.94rem;line-height:1.85;font-weight:500}
.sera-bubble .solution-line{margin-top:8px;color:#CFFFE6;font-weight:700}
.hero h1{font-size:clamp(1.9rem,4.6vw,3.6rem);font-weight:900;line-height:1.28;letter-spacing:0;margin-bottom:14px;
    background:linear-gradient(100deg,#fff 30%,var(--blue-soft) 70%,var(--orange));-webkit-background-clip:text;background-clip:text;color:transparent;
    text-shadow:0 12px 30px rgba(0,0,0,.18)}
.hero p.sub{font-size:clamp(.98rem,1.6vw,1.12rem);color:rgba(255,255,255,.8);max-width:640px;margin:0 auto 28px;font-weight:400;line-height:1.9}
.cta-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn{font-family:var(--font-body);font-weight:700;font-size:1rem;padding:14px 32px;border-radius:14px;border:none;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;transition:transform .25s ease,box-shadow .25s ease,background .25s ease,color .25s ease,border-color .25s ease;pointer-events:auto}
.btn-primary{background:linear-gradient(120deg,var(--orange),#FFA45C);color:var(--night);box-shadow:0 10px 32px rgba(255,138,61,.35)}
.btn-primary:hover{transform:translateY(-3px) scale(1.02);box-shadow:0 16px 44px rgba(255,138,61,.5)}
.btn-ghost{background:var(--glass);color:#fff;border:1px solid var(--glass-brd);backdrop-filter:blur(10px)}
.btn-ghost:hover{background:rgba(255,255,255,.16);transform:translateY(-3px)}
.hero-tools{display:flex;justify-content:center;gap:10px;margin-bottom:18px;flex-wrap:wrap}
.intro-line{position:absolute;left:50%;bottom:clamp(88px,14vh,140px);transform:translateX(-50%);z-index:21;max-width:min(720px,88vw);
    padding:16px 20px;border-radius:24px;background:linear-gradient(180deg,rgba(255,255,255,.16),rgba(255,255,255,.08));
    border:1px solid rgba(255,255,255,.18);box-shadow:0 20px 56px rgba(0,0,0,.28);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    text-align:center;opacity:0;transform:translateX(-50%) translateY(14px);transition:opacity .32s ease,transform .32s ease}
.intro-line{display:none}
body.intro-running .intro-line{display:block}
.intro-line.show{opacity:1;transform:translateX(-50%) translateY(0)}
.intro-line .kicker{display:block;font-size:.74rem;font-weight:800;letter-spacing:.4px;color:var(--blue-soft);margin-bottom:6px}
.intro-line .txt{font-family:var(--font-display);font-size:clamp(1rem,2.2vw,1.5rem);line-height:1.8;font-weight:800}
.intro-line .txt.small{font-family:var(--font-body);font-size:clamp(.92rem,1.6vw,1.06rem);font-weight:600;color:rgba(255,255,255,.84)}
.replay{position:static;z-index:20;font-family:var(--font-body);font-size:.8rem;font-weight:600;
    color:#fff;background:var(--glass);border:1px solid var(--glass-brd);border-radius:999px;padding:8px 16px;cursor:pointer;backdrop-filter:blur(10px);transition:.25s}
.replay:hover{background:rgba(255,255,255,.18)}
.sound-toggle{position:static;z-index:20;width:40px;height:40px;border-radius:50%;
    border:1px solid var(--glass-brd);background:var(--glass);color:#fff;display:grid;place-items:center;font-size:1rem;cursor:pointer;
    backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);transition:transform .25s ease,background .25s ease,border-color .25s ease,box-shadow .25s ease}
.sound-toggle:hover{transform:translateY(-2px);background:rgba(255,255,255,.16);box-shadow:0 10px 24px rgba(0,0,0,.14)}
.sound-toggle[aria-pressed="true"]{background:rgba(22,155,98,.18);border-color:rgba(86,224,160,.28)}
body.intro-running .hero-copy{pointer-events:none}
/* ---------- SECTIONS ---------- */
section.block{padding:96px 5vw;position:relative}
.wrap{max-width:1120px;margin-inline:auto}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:1px;color:var(--orange);margin-bottom:12px}
.block h2{font-size:clamp(1.6rem,3.4vw,2.6rem);font-weight:800;margin-bottom:16px}
.block p.lead{color:rgba(255,255,255,.72);max-width:640px;font-weight:300;font-size:1.05rem}

.on-sand{background:var(--sand);color:var(--ink)}
.on-sand .block h2,.on-sand h2{color:var(--ink)}
.on-sand p.lead{color:rgba(11,31,58,.72)}
.on-sand .eyebrow{color:var(--green)}

/* reveal */
.rv{opacity:0;transform:translateY(34px);transition:opacity .8s cubic-bezier(.2,.7,.3,1),transform .8s cubic-bezier(.2,.7,.3,1)}
.rv.in{opacity:1;transform:none}
.rv.d1{transition-delay:.08s}.rv.d2{transition-delay:.16s}.rv.d3{transition-delay:.24s}
.rv.d4{transition-delay:.32s}.rv.d5{transition-delay:.4s}.rv.d6{transition-delay:.48s}

/* problem grid */
.prob-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;margin-top:44px}
.prob-card{background:#fff;border:1px solid rgba(11,31,58,.08);border-radius:var(--radius);padding:26px 24px;
    box-shadow:0 6px 28px rgba(11,31,58,.06);transition:.3s}
.prob-card:hover{transform:translateY(-5px);box-shadow:0 16px 40px rgba(11,31,58,.12)}
.prob-card .ico{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;font-size:1.3rem;margin-bottom:14px;
    background:rgba(214,48,49,.1);color:#C0392B}
.prob-card h3{font-size:1.05rem;font-weight:700;margin-bottom:6px;color:var(--ink)}
.prob-card p{font-size:.88rem;color:rgba(11,31,58,.62);line-height:1.7}

/* solution */
.solution{background:radial-gradient(1100px 500px at 80% 0%,rgba(46,107,255,.18),transparent 60%),var(--night-2)}
.sol-split{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;margin-top:30px}
.sera-chip{display:inline-flex;align-items:center;gap:10px;background:var(--glass);border:1px solid var(--glass-brd);
    border-radius:999px;padding:8px 18px;font-size:.85rem;font-weight:600;margin-bottom:18px}
.sera-orb{width:18px;height:18px;border-radius:50%;background:radial-gradient(circle at 35% 30%,#9DC0FF,var(--blue) 60%,#0A3DAF);box-shadow:0 0 16px var(--blue);animation:orb 2.6s infinite}
@keyframes orb{0%,100%{box-shadow:0 0 10px var(--blue)}50%{box-shadow:0 0 22px var(--blue),0 0 40px rgba(46,107,255,.4)}}
.sol-points{list-style:none;display:flex;flex-direction:column;gap:14px;margin-top:22px}
.sol-points li{display:flex;gap:12px;align-items:flex-start;font-size:.98rem;color:rgba(255,255,255,.85)}
.sol-points li b{color:#fff}
.sol-points .chk{flex:none;width:26px;height:26px;border-radius:9px;display:grid;place-items:center;font-size:.8rem;
    background:rgba(22,155,98,.18);color:#56E0A0;border:1px solid rgba(86,224,160,.35);margin-top:3px}
.sera-panel{position:relative;background:linear-gradient(160deg,rgba(255,255,255,.1),rgba(255,255,255,.03));
    border:1px solid var(--glass-brd);border-radius:24px;padding:26px;backdrop-filter:blur(16px);box-shadow:0 24px 70px rgba(0,0,0,.35)}
.sera-panel .row{display:flex;justify-content:space-between;align-items:center;background:rgba(8,26,51,.5);
    border:1px solid rgba(255,255,255,.08);border-radius:14px;padding:13px 16px;margin-bottom:11px;font-size:.86rem}
.sera-panel .row:last-child{margin-bottom:0}
.sera-panel .row .lbl{color:rgba(255,255,255,.65)}
.sera-panel .row .val{font-weight:700}
.val.up{color:#56E0A0}.val.warn{color:var(--orange)}
.sera-panel .reco{margin-top:14px;background:rgba(46,107,255,.14);border:1px solid rgba(110,155,255,.35);border-radius:14px;padding:14px 16px;font-size:.85rem;line-height:1.8}
.sera-panel .reco b{color:var(--blue-soft)}
.float-slow{animation:floaty 6s ease-in-out infinite}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}

/* features */
.feat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px;margin-top:44px}
.feat-card{background:var(--glass);border:1px solid var(--glass-brd);border-radius:var(--radius);padding:28px 24px;backdrop-filter:blur(12px);
    transition:.3s;position:relative;overflow:hidden}
.feat-card::after{content:"";position:absolute;inset:auto -40% -60% auto;width:220px;height:220px;border-radius:50%;
    background:radial-gradient(circle,rgba(46,107,255,.22),transparent 70%);opacity:0;transition:.4s}
.feat-card:hover{transform:translateY(-6px);border-color:rgba(110,155,255,.45)}
.feat-card:hover::after{opacity:1}
.feat-card .ico{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;font-size:1.35rem;margin-bottom:16px;
    background:linear-gradient(135deg,rgba(46,107,255,.25),rgba(255,138,61,.2));border:1px solid rgba(255,255,255,.12)}
.feat-card h3{font-size:1.08rem;font-weight:700;margin-bottom:8px}
.feat-card p{font-size:.88rem;color:rgba(255,255,255,.66)}

/* how it works */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:54px;position:relative}
.flow::before{content:"";position:absolute;top:34px;inset-inline:9%;height:2px;
    background:repeating-linear-gradient(to left,var(--green) 0 10px,transparent 10px 18px);opacity:.5}
.step{text-align:center;padding:0 14px;position:relative}
.step .num{width:68px;height:68px;margin:0 auto 18px;border-radius:22px;display:grid;place-items:center;font-family:var(--font-display);
    font-weight:800;font-size:1.4rem;color:#fff;background:linear-gradient(135deg,var(--blue),#1A4FD6);box-shadow:0 12px 30px rgba(46,107,255,.35);position:relative;z-index:1}
.step:nth-child(2) .num{background:linear-gradient(135deg,#2E8BFF,#2E6BFF)}
.step:nth-child(3) .num{background:linear-gradient(135deg,var(--orange),#E8702A);box-shadow:0 12px 30px rgba(255,138,61,.35)}
.step:nth-child(4) .num{background:linear-gradient(135deg,var(--green),#0E7A4A);box-shadow:0 12px 30px rgba(22,155,98,.35)}
.step h3{font-size:1rem;font-weight:700;margin-bottom:6px;color:var(--ink)}
.step p{font-size:.84rem;color:rgba(11,31,58,.6)}
.flow-tags{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:40px}
.flow-tags span{font-size:.8rem;font-weight:600;padding:7px 16px;border-radius:999px;background:#fff;border:1px solid rgba(11,31,58,.1);color:var(--ink)}
.flow-tags .arrow{background:none;border:none;color:var(--green);font-weight:800}

/* results */
.results{background:radial-gradient(900px 480px at 15% 10%,rgba(22,155,98,.16),transparent 60%),var(--night)}
.res-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;margin-top:44px}
.res-card{background:var(--glass);border:1px solid var(--glass-brd);border-radius:var(--radius);padding:26px 22px;backdrop-filter:blur(12px);text-align:center;transition:.3s}
.res-card:hover{transform:translateY(-5px);border-color:rgba(86,224,160,.4)}
.res-card .metric{font-family:var(--font-display);font-weight:900;font-size:2.4rem;color:#56E0A0;direction:ltr}
.res-card .metric.blue{color:var(--blue-soft)}
.res-card .metric.orange{color:var(--orange)}
.res-card h3{font-size:.98rem;font-weight:700;margin-top:6px}
.res-card p{font-size:.82rem;color:rgba(255,255,255,.6);margin-top:4px}

/* final CTA */
.final{background:linear-gradient(150deg,var(--night-2),#123A7A 60%,#1A4FD6);position:relative;overflow:hidden}
.final::before{content:"";position:absolute;width:560px;height:560px;border-radius:50%;top:-220px;inset-inline-start:-160px;
    background:radial-gradient(circle,rgba(255,138,61,.25),transparent 65%)}
.final .wrap{text-align:center;position:relative;z-index:1}
.final h2{font-size:clamp(1.8rem,4vw,3rem);font-weight:900}
.final p{max-width:560px;margin:14px auto 32px;color:rgba(255,255,255,.8);font-weight:300}

footer{padding:34px 5vw;text-align:center;font-size:.8rem;color:rgba(255,255,255,.4);background:var(--night);border-top:1px solid rgba(255,255,255,.06)}

@media (max-width:880px){
    .sol-split{grid-template-columns:1fr;gap:40px}
    .flow{grid-template-columns:repeat(2,1fr);row-gap:40px}
    .flow::before{display:none}
}
@media (max-width:560px){
    .flow{grid-template-columns:1fr}
    .hero-copy{padding-bottom:44px}
    .sera-bubble{min-width:210px;max-width:250px;padding:10px 13px}
}
@media (max-width:1024px){
    .hero-copy{max-width:760px;padding:0 4vw 42px}
    .hero h1{font-size:clamp(1.8rem,5vw,3.1rem)}
    .hero p.sub{max-width:600px;font-size:clamp(.95rem,1.8vw,1.05rem)}
    .sera-bubble{max-width:min(300px,72vw)}
    .tag3d{font-size:.78rem;padding:9px 14px;max-width:72vw;white-space:normal;line-height:1.45}
    .btn{font-size:.95rem;padding:13px 24px}
}
@media (max-width:480px){
    .hero{min-height:100svh;min-height:100dvh}
    .hero-copy{padding:0 4vw 18px;max-width:100%}
    .hero-tools{gap:8px;margin-bottom:14px;flex-wrap:wrap}
    .replay,.sound-toggle{min-height:44px}
    .replay{padding:10px 14px;font-size:.76rem}
    .sound-toggle{width:44px;height:44px;font-size:1rem}
    .intro-start{padding:12px 18px;font-size:.92rem}
    .intro-line{bottom:84px;max-width:92vw;padding:14px 16px;border-radius:20px}
    .intro-line .txt{font-size:clamp(.96rem,4.8vw,1.18rem)}
    .cta-row{flex-direction:column;align-items:stretch}
    .cta-row .btn{width:100%;min-height:44px;padding:12px 16px}
    .hero h1{font-size:clamp(1.5rem,7vw,2.15rem);line-height:1.18}
    .hero p.sub{font-size:clamp(.9rem,4.2vw,1rem);line-height:1.75;max-width:100%;margin-bottom:18px}
    .sera-bubble{max-width:min(88vw,260px);padding:10px 12px;font-size:.88rem}
    .tag3d{font-size:.7rem;padding:8px 10px;max-width:80vw;white-space:normal;line-height:1.45}
    .tagMark{width:10px;height:10px}
}
@media (min-width:1440px){
    .hero-copy{max-width:980px}
    .hero p.sub{max-width:760px}
    .sera-bubble{max-width:340px}
    .intro-line{max-width:760px}
}
@media (prefers-reduced-motion:reduce){
    *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
    .rv{opacity:1;transform:none}
    .sera-bubble{opacity:0!important;transform:translate(-50%,-18px) scale(.96)!important}
}