/* RiverMeadow x AtlasGTM case study
   AtlasGTM purple for actions, RiverMeadow blue for RiverMeadow content tags, navy for dark bands. */
:root{
  --p:#3900b4; --p2:#5001f4; --p-tint:#f1edff; --p-line:#d9d0ff;
  --rm:#0b74fb; --rm-light:#6ba9f7; --rm-tint:#e8f1ff;
  --navy:#0b1220; --navy-2:#141d33;
  --bg:#f8f9fb; --surface:#fff; --ink:#0f172a; --text:#374151; --muted:#64748b; --border:#e5e7eb;
  --ok:#15803d;
  --r-sm:8px; --r-md:12px; --r-lg:16px;
  --u:8px;
  --shadow:0 1px 2px rgba(15,23,42,.04),0 8px 24px -16px rgba(15,23,42,.18);
  --font:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:88px}
body{margin:0;font-family:var(--font);color:var(--text);background:var(--bg);font-size:16px;line-height:1.6;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:var(--p)}
h1,h2,h3,h4{color:var(--ink);line-height:1.12;margin:0 0 16px}
h1{font-size:clamp(2.2rem,4.4vw,3.5rem);font-weight:800;letter-spacing:-.035em;line-height:1.02}
h1 em{font-style:normal;color:var(--p)}
h2{font-size:clamp(1.6rem,3vw,2.35rem);font-weight:800;letter-spacing:-.025em;max-width:28ch}
h3{font-size:1.08rem;font-weight:700;letter-spacing:-.01em}
p{margin:0 0 16px}
.wrap{max-width:1140px;margin:0 auto;padding:0 24px}
.sec{padding:88px 0}
.sec.alt{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.kicker{display:inline-block;font-size:.75rem;font-weight:800;letter-spacing:.13em;text-transform:uppercase;color:var(--p);margin-bottom:12px}
.lead{font-size:1.12rem;line-height:1.65;color:#4b5563;max-width:64ch}
.sec-head{margin-bottom:36px}
.sec-head .lead{margin-bottom:0}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 22px;border-radius:999px;font:700 .95rem/1.2 var(--font);text-decoration:none;border:1.5px solid transparent;cursor:pointer;transition:transform .12s ease,background .12s ease,border-color .12s ease,box-shadow .12s ease}
.btn:hover{transform:translateY(-1px)}
.btn:focus-visible,.q:focus-visible,a:focus-visible{outline:3px solid rgba(80,1,244,.35);outline-offset:2px}
.btn-primary{background:var(--p);color:#fff;box-shadow:0 8px 20px -8px rgba(57,0,180,.55)}
.btn-primary:hover{background:var(--p2)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--border)}
.btn-ghost:hover{border-color:#cbd5e1}
.btn-light{background:#fff;color:var(--p)}
.btn-sm{padding:9px 16px;font-size:.86rem}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--border)}
.nav-in{display:flex;align-items:center;justify-content:space-between;gap:16px;height:72px}
.marks{display:flex;align-items:center;gap:14px;text-decoration:none}
.marks .rm-logo{height:32px;width:auto}
.marks .x{color:#9aa4b2;font-weight:500;font-size:1.1rem}
.marks .atlas-logo{height:42px;width:auto}
.nav-links{display:flex;gap:22px;align-items:center}
.nav-links a{color:#334155;text-decoration:none;font-weight:600;font-size:.9rem;white-space:nowrap}
.nav-links a:hover{color:var(--p)}
.nav-cta{display:flex;align-items:center;gap:10px}
.burger{display:none;background:none;border:1px solid var(--border);border-radius:var(--r-sm);padding:8px 10px;cursor:pointer}
.burger span{display:block;width:18px;height:2px;background:var(--ink);margin:3px 0}
@media (max-width:1020px){
  .nav-links{display:none;position:absolute;left:0;right:0;top:72px;background:#fff;border-bottom:1px solid var(--border);flex-direction:column;align-items:flex-start;padding:16px 24px;gap:14px}
  .nav.open .nav-links{display:flex}
  .burger{display:block}
}
@media (max-width:600px){
  .marks{gap:9px}
  .marks .rm-logo{height:24px}
  .marks .atlas-logo{height:32px}
  .nav-cta .btn{display:none}
}

/* hero */
.hero{background:radial-gradient(1100px 480px at 85% -10%,rgba(80,1,244,.10),transparent 60%),radial-gradient(800px 400px at 0% 100%,rgba(11,116,251,.07),transparent 60%),#fff;border-bottom:1px solid var(--border)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;padding-top:80px;padding-bottom:72px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.built{margin-top:24px;font-size:.82rem;color:var(--muted);font-weight:600}
.built b{color:var(--ink);font-weight:700}
@media (max-width:960px){.hero-grid{grid-template-columns:1fr;gap:36px;padding-top:56px;padding-bottom:56px}}

/* video card */
.video{background:var(--navy);border-radius:var(--r-lg);overflow:hidden;color:#fff;box-shadow:0 30px 60px -30px rgba(2,6,23,.55)}
.video iframe{width:100%;aspect-ratio:16/9;display:block;border:0}
.video-copy{padding:18px 22px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.video-copy strong{display:block;font-size:1rem;color:#fff}
.video-copy span{color:#a9b8cf;font-size:.88rem}
.video-copy a{color:#c9bcff;font-weight:700;font-size:.88rem;text-decoration:none;white-space:nowrap}
.video-copy a:hover{text-decoration:underline}
.video.wide{max-width:960px;margin:0 auto}

/* quote + before/after */
.quote{padding:44px;border-radius:var(--r-lg);background:linear-gradient(135deg,var(--p),var(--p2));color:#fff}
.quote blockquote{font-size:clamp(1.45rem,2.8vw,2.15rem);line-height:1.2;letter-spacing:-.025em;font-weight:700;margin:0;max-width:30ch}
.quote p{color:#e2dcff;margin:22px 0 0;font-size:.95rem}
.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:18px}
.compare{background:#fff;border:1px solid var(--border);border-radius:var(--r-lg);padding:28px}
.compare.after{background:var(--p-tint);border-color:var(--p-line)}
.compare h3{font-size:.75rem;text-transform:uppercase;letter-spacing:.12em;font-weight:800;color:var(--muted);margin:0 0 10px}
.compare.after h3{color:var(--p)}
.compare ul{padding:0;margin:0;list-style:none}
.compare li{padding:12px 0 12px 26px;border-bottom:1px solid var(--border);position:relative;font-size:.98rem}
.compare.after li{border-color:var(--p-line)}
.compare li:last-child{border:0;padding-bottom:0}
.compare li:before{content:"\2715";position:absolute;left:0;top:12px;color:#94a3b8;font-weight:700;font-size:.85rem}
.compare.after li:before{content:"\2713";color:var(--p)}
@media (max-width:760px){.compare-grid{grid-template-columns:1fr}.quote{padding:30px}}

/* step rows (flagship pattern, flow) */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.step{background:#fff;border:1px solid var(--border);border-radius:var(--r-lg);padding:22px;position:relative}
.step .k{font-size:.72rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--p);margin-bottom:10px}
.step h3{font-size:1.02rem;margin-bottom:6px}
.step p{font-size:.92rem;margin:0;color:#4b5563}
.step:after{content:"\2192";position:absolute;right:-14px;top:22px;color:#cbd5e1;font-size:1.2rem;z-index:1}
.step:last-child:after{display:none}
@media (max-width:960px){.steps{grid-template-columns:1fr 1fr}.step:after{display:none}}
@media (max-width:560px){.steps{grid-template-columns:1fr}}

/* flagship app */
.flag{display:grid;grid-template-columns:1.35fr .65fr;gap:22px;margin-top:22px;align-items:stretch}
.app{background:#fff;border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column}
.app-head{padding:20px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.app-head h3{margin:0 0 4px}
.app-head p{margin:0;font-size:.92rem;color:#4b5563;max-width:52ch}
.metric{background:var(--navy);color:#fff;border-radius:var(--r-lg);padding:28px;display:flex;flex-direction:column;justify-content:center}
.metric .lbl{font-size:.72rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--rm-light);margin-bottom:18px}
.metric b{display:block;font-size:clamp(2.2rem,4vw,3rem);letter-spacing:-.04em;line-height:1;color:#fff}
.metric small{display:block;margin:8px 0 24px;color:#a9b8cf;font-size:.9rem;line-height:1.45}
.metric .note{margin:0;padding-top:16px;border-top:1px solid rgba(255,255,255,.12);color:#8fa0bb;font-size:.78rem;line-height:1.5}
@media (max-width:960px){.flag{grid-template-columns:1fr}}

/* scaled live previews */
.frame{position:relative;aspect-ratio:16/10;background:#eef2f7;overflow:hidden;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.frame iframe{position:absolute;top:0;left:0;width:200%;height:200%;border:0;transform:scale(.5);transform-origin:0 0;background:#fff}
.app .frame{border-bottom:0;flex:1;min-height:320px}
.frame-link{position:absolute;right:12px;bottom:12px;background:rgba(11,18,32,.88);color:#fff;font-size:.8rem;font-weight:700;padding:8px 14px;border-radius:999px;text-decoration:none;backdrop-filter:blur(6px)}
.frame-link:hover{background:var(--p)}

/* challenge */
.challenge{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;margin-bottom:48px}
.challenge h2{max-width:18ch}
.memo{background:var(--navy);color:#e5e7eb;border-radius:var(--r-lg);padding:30px;box-shadow:0 30px 60px -30px rgba(2,6,23,.5);position:relative}
.memo:before{content:"";position:absolute;inset:0;border-radius:inherit;background:linear-gradient(135deg,rgba(80,1,244,.28),transparent 55%);pointer-events:none}
.memo .from{display:flex;align-items:center;gap:10px;font-size:.8rem;color:#9fb3d1;margin-bottom:14px;position:relative}
.memo .from b{color:#fff;font-weight:700}
.memo .from .dot{width:8px;height:8px;border-radius:50%;background:var(--rm-light)}
.memo blockquote{margin:0;font-size:1.02rem;line-height:1.6;color:#e8edf5;position:relative}
.memo blockquote strong{color:#fff;font-size:1.22rem;line-height:1.3;display:block;margin-bottom:10px;letter-spacing:-.01em}
.memo .tail{margin-top:16px;padding-top:14px;border-top:1px solid rgba(255,255,255,.12);font-size:.85rem;color:#9fb3d1;position:relative}
@media (max-width:960px){.challenge{grid-template-columns:1fr;gap:28px}}

/* accordion */
.accordion{display:flex;flex-direction:column;gap:10px}
.concern{background:#fff;border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;transition:border-color .15s ease,box-shadow .15s ease}
.concern.open{border-color:var(--p-line);box-shadow:var(--shadow)}
.q{display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:none;border:0;padding:18px 22px;cursor:pointer;font:inherit;color:inherit}
.q .n{width:30px;height:30px;flex-shrink:0;border-radius:9px;background:var(--p-tint);color:var(--p);font-weight:800;font-size:.88rem;display:grid;place-items:center}
.q .qt{flex:1;font-weight:700;color:var(--ink);font-size:1rem}
.q .chev{flex-shrink:0;width:10px;height:10px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .2s ease;margin-right:4px}
.concern.open .chev{transform:rotate(-135deg);border-color:var(--p)}
.a{max-height:0;overflow:hidden;transition:max-height .28s ease}
.concern.open .a{max-height:420px}
.a-in{padding:0 22px 22px 66px;color:#4b5563;font-size:.96rem;line-height:1.65}
@media (max-width:600px){.a-in{padding-left:22px}}

/* chain + kit cards */
.chain{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:22px}
.cstep{background:var(--p-tint);border:1px solid var(--p-line);border-radius:var(--r-lg);padding:18px 20px;position:relative}
.cstep .k{font-size:.7rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--p);margin-bottom:6px}
.cstep h4{font-size:1rem;margin:0 0 4px}
.cstep p{font-size:.88rem;margin:0;color:#4b5563}
.cstep:after{content:"\2192";position:absolute;right:-14px;top:24px;color:#b9a9f5;font-size:1.2rem;z-index:1}
.cstep:last-child:after{display:none}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media (max-width:960px){.chain,.grid-3{grid-template-columns:1fr}.cstep:after{display:none}}
.kitcard{border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;background:#fff;display:flex;flex-direction:column;box-shadow:var(--shadow)}
.kitcard .head{padding:16px 20px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;gap:10px}
.kitcard .head h3{margin:0;font-size:1rem}
.where{font-size:.68rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#fff;background:var(--navy);padding:4px 10px;border-radius:999px;white-space:nowrap}
.kitcard .body{padding:8px 20px;flex:1}
.kitcard ul{margin:0;padding:0;list-style:none}
.kitcard li{padding:10px 0 10px 16px;border-bottom:1px dashed var(--border);font-size:.92rem;position:relative}
.kitcard li:last-child{border-bottom:0}
.kitcard li:before{content:"";position:absolute;left:0;top:18px;width:7px;height:7px;border-radius:50%;background:var(--rm)}
.kitcard li b{color:var(--ink)}
.kitcard .foot{padding:12px 20px 16px;font-size:.85rem;color:var(--muted);border-top:1px solid var(--border);background:#fafbfc}
.sub-head{margin:56px 0 18px}
.sub-head h3{font-size:1.3rem;letter-spacing:-.02em;margin:0}
.card{background:#fff;border:1px solid var(--border);border-radius:var(--r-lg);padding:22px;box-shadow:var(--shadow)}
.card h3{font-size:1rem;margin-bottom:6px}
.card p{font-size:.92rem;margin:0;color:#4b5563}
.use,.tag{display:inline-block;font-size:.7rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--rm);background:var(--rm-tint);border-radius:999px;padding:4px 10px;margin-bottom:12px}

/* gallery */
.usecat{margin-top:40px}
.usecat:first-of-type{margin-top:0}
.usecat-head{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.usecat-head h3{margin:0;font-size:.78rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--ink)}
.usecat-head .line{flex:1;height:1px;background:var(--border)}
.gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
@media (max-width:860px){.gallery{grid-template-columns:1fr}}
.show{background:#fff;border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column}
.show .frame{border-top:0}
.show.hot{border-color:var(--rm);box-shadow:0 0 0 3px rgba(11,116,251,.14),var(--shadow)}
.show-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1}
.show-meta{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:10px;flex-wrap:wrap}
.show-meta .tag{margin-bottom:0}
.show h3{margin-bottom:6px}
.show p{font-size:.94rem;margin-bottom:14px;color:#4b5563}
.show .more{margin-top:auto;font-size:.78rem;color:var(--muted);text-decoration:none;word-break:break-all;font-family:var(--mono)}
.show .more:hover{color:var(--p);text-decoration:underline}
.viewstat{display:inline-flex;align-items:center;gap:6px;font-size:.78rem;font-weight:700;color:var(--muted);background:var(--bg);border:1px solid var(--border);border-radius:999px;padding:3px 10px}
.viewstat.hot{color:#fff;background:var(--rm);border-color:var(--rm)}
.more-strip{margin-top:28px;background:#fff;border:1px dashed #cbd5e1;border-radius:var(--r-lg);padding:18px 22px;font-size:.95rem;color:#4b5563}
.more-strip b{color:var(--ink)}

/* analytics band */
.band{background:var(--navy);color:#cbd5e1;padding:72px 0}
.band h2{color:#fff}
.band .kicker{color:var(--rm-light)}
.band .lead{color:#a9b8cf;font-size:1rem}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:32px}
.stat{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:var(--r-md);padding:22px;min-width:0}
.stat .v{font-size:2rem;font-weight:800;color:#fff;letter-spacing:-.03em;line-height:1.1;overflow-wrap:anywhere}
.stat .l{font-size:.88rem;color:#a9b8cf;margin-top:8px;line-height:1.5}
.stat.hot{background:rgba(11,116,251,.16);border-color:rgba(11,116,251,.45)}
.stat .fire{display:inline-flex;font-size:.68rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#fff;background:var(--rm);border-radius:999px;padding:3px 9px;margin-bottom:10px}
@media (max-width:960px){.stat-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:480px){.stat-grid{grid-template-columns:1fr}}

/* prompt example */
.prompt{background:var(--navy);color:#e2e8f0;border-radius:var(--r-lg);padding:24px;margin-top:22px;display:grid;grid-template-columns:1fr 1fr;gap:20px}
.prompt .box{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:var(--r-md);padding:18px 20px}
.prompt .lbl{font-size:.72rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--rm-light);margin-bottom:10px}
.prompt .msg{font-family:var(--mono);font-size:.88rem;line-height:1.6;color:#f8fafc}
.prompt ul{margin:0;padding:0;list-style:none;font-size:.92rem}
.prompt li{padding:5px 0;display:flex;gap:10px}
.prompt li:before{content:"\2713";color:#4ade80;font-weight:700}
@media (max-width:860px){.prompt{grid-template-columns:1fr}}

/* final CTA */
.final{background:linear-gradient(135deg,var(--p),var(--p2));color:#fff;padding:88px 0}
.final .kicker{color:#d9d0ff}
.final h2{color:#fff}
.final .lead{color:#e7e3ff}
.final-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.form{display:grid;grid-template-columns:1fr 1fr;gap:12px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:var(--r-lg);padding:24px}
.form label{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.form input,.form textarea{width:100%;padding:13px 14px;border:1px solid transparent;border-radius:var(--r-sm);font:inherit;font-size:.95rem;background:#fff;color:var(--ink)}
.form input:focus,.form textarea:focus{outline:3px solid rgba(255,255,255,.45);outline-offset:1px}
.form .full{grid-column:1/-1}
.form textarea{min-height:104px;resize:vertical}
.form .btn{justify-self:start}
.form-msg{grid-column:1/-1;min-height:1.4em;margin:0;color:#eeeaff;font-size:.9rem}
.hp{position:absolute!important;left:-9999px}
@media (max-width:960px){.final-grid{grid-template-columns:1fr;gap:32px}}
@media (max-width:520px){.form{grid-template-columns:1fr}}

/* footer */
footer{padding:36px 0;background:#fff;border-top:1px solid var(--border)}
.foot-in{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.foot-in .marks .atlas-logo{height:36px}
.foot-in .marks .rm-logo{height:28px}
footer p{margin:0;font-size:.85rem;color:var(--muted);max-width:60ch}

/* reveal */
.rv{opacity:0;transform:translateY(10px);transition:opacity .5s ease,transform .5s ease}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}
@media (max-width:760px){.sec{padding:60px 0}.band,.final{padding:60px 0}}