/* BrainO SEO — design tokens + components. All colours as semantic CSS custom properties (white-label = variable swap). */
:root{
  --color-bg:#190f39; --color-surface:#221a42; --color-surface-2:#1a1030;
  --color-text:#f4f0fa; --color-text-muted:#b3a9cf; --color-border:#342a58;
  --color-accent:#8a2ce2; --color-accent-2:#c084fc; --color-accent-contrast:#ffffff; --color-gold:#ffd500;
  --color-dark:#120a2b; --color-dark-text:#f4f0fa;
  --grad:linear-gradient(120deg,#8a2ce2,#ffd500);
  --maxw:1120px; --measure:68ch; --radius:16px;
  --step--1:clamp(.82rem,.8rem + .1vw,.9rem); --step-0:clamp(1rem,.96rem + .2vw,1.0625rem);
  --step-1:clamp(1.2rem,1.1rem + .5vw,1.35rem); --step-2:clamp(1.5rem,1.3rem + 1vw,1.9rem);
  --step-3:clamp(1.9rem,1.5rem + 2vw,2.6rem); --step-4:clamp(2.4rem,1.8rem + 3.4vw,3.9rem);
  --sp:.75rem; --section:clamp(4rem,10vw,7.5rem);
  --font:ui-sans-serif,system-ui,-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation-duration:.001ms!important;transition-duration:.001ms!important}}
body{margin:0;background:radial-gradient(1100px 650px at 82% -8%,rgba(138,44,226,.22),transparent 60%),radial-gradient(900px 550px at -8% 16%,rgba(255,213,0,.05),transparent 55%),var(--color-bg);background-attachment:fixed;color:var(--color-text);font-family:var(--font);font-size:var(--step-0);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3{line-height:1.1;letter-spacing:-.02em;text-wrap:balance;margin:0 0 .5em}
h1{font-size:var(--step-4);font-weight:800}
h2{font-size:var(--step-3);font-weight:800}
h3{font-size:var(--step-1);font-weight:700}
p{margin:0 0 1em;max-width:var(--measure)}
a{color:var(--color-accent);text-underline-offset:3px}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--color-accent);outline-offset:2px;border-radius:6px}
img,svg{max-width:100%;height:auto;display:block}
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:clamp(1rem,4vw,2rem)}
.section{padding-block:var(--section)}
.skip{position:absolute;left:-999px}.skip:focus{left:1rem;top:1rem;z-index:99;background:var(--color-accent);color:#fff;padding:.6rem 1rem;border-radius:8px}
/* buttons */
.btn{display:inline-flex;align-items:center;gap:.5rem;font-weight:700;text-decoration:none;border-radius:10px;padding:.8rem 1.3rem;font-size:var(--step-0);border:1px solid transparent;cursor:pointer;transition:transform .08s ease,filter .15s ease;line-height:1}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--color-accent);color:var(--color-accent-contrast)}
.btn-primary:hover{filter:brightness(1.08)}
.btn-ghost{background:transparent;color:var(--color-text);border-color:var(--color-border)}
.btn-ghost:hover{border-color:var(--color-accent)}
/* eyebrow pill */
.eyebrow{display:inline-block;font-size:var(--step--1);font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--color-accent);background:var(--color-surface-2);border:1px solid var(--color-border);padding:.35rem .8rem;border-radius:999px;margin-bottom:1rem}
.lede{color:var(--color-text-muted);font-size:var(--step-1);max-width:60ch}
.muted{color:var(--color-text-muted)}
/* header */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--color-bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--color-border)}
.nav{display:flex;align-items:center;gap:1.4rem;padding-block:.85rem}
.brand{display:flex;align-items:center;gap:.55rem;font-weight:800;letter-spacing:-.02em;text-decoration:none;color:var(--color-text);font-size:1.15rem}
.brand .logo{width:30px;height:30px}
.nav-links{display:flex;gap:1.2rem;margin-left:auto;align-items:center}
.nav-links a{color:var(--color-text);text-decoration:none;font-weight:600;font-size:var(--step-0)}
.nav-links a:hover{color:var(--color-accent)}
.nav-cta{margin-left:.4rem}
/* mobile nav = pure-CSS <details>, zero JS */
.mobmenu{display:none;margin-left:auto;position:relative}
.mobmenu>summary{list-style:none;cursor:pointer;border:1px solid var(--color-border);border-radius:9px;padding:.5rem .7rem;color:var(--color-text);font-weight:700}
.mobmenu>summary::-webkit-details-marker{display:none}
.mobmenu[open]>summary::after{content:""}
.mobmenu .sheet{position:absolute;right:0;top:calc(100% + .5rem);background:var(--color-surface);border:1px solid var(--color-border);border-radius:12px;padding:.6rem;display:flex;flex-direction:column;gap:.2rem;min-width:220px;box-shadow:0 18px 50px rgba(0,0,0,.18)}
.mobmenu .sheet a{padding:.6rem .7rem;border-radius:8px;text-decoration:none;color:var(--color-text);font-weight:600}
.mobmenu .sheet a:hover{background:var(--color-surface-2)}
@media (max-width:860px){ .nav-links{display:none} .mobmenu{display:block} }
/* hero */
.hero{position:relative;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:2.5rem;align-items:center}
@media (max-width:880px){.hero-grid{grid-template-columns:1fr}}
.hero h1 span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.audit-form{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:1.6rem;max-width:520px}
.audit-form input{flex:1;min-width:220px;padding:.85rem 1rem;border-radius:10px;border:1px solid var(--color-border);background:var(--color-surface);color:var(--color-text);font-size:var(--step-0);font-family:inherit}
.hero-note{font-size:var(--step--1);color:var(--color-text-muted);margin-top:.8rem}
.blob{width:100%;height:auto}
/* trust strip */
.trust{border-block:1px solid var(--color-border);background:var(--color-surface)}
.trust .wrap{display:flex;flex-wrap:wrap;gap:1rem 2.4rem;align-items:center;justify-content:center;padding-block:1.1rem;color:var(--color-text-muted);font-size:var(--step--1)}
.trust strong{color:var(--color-text)}
/* cards grid */
.grid{display:grid;gap:1.2rem}
.g4{grid-template-columns:repeat(4,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g2{grid-template-columns:repeat(2,1fr)}
@media (max-width:980px){.g4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:760px){.g4,.g3,.g2{grid-template-columns:1fr}}
.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:1.5rem;display:flex;flex-direction:column;gap:.5rem}
.card .ic{width:34px;height:34px;color:var(--color-accent)}
.card h3{margin:.3rem 0 .1rem}
.card p{color:var(--color-text-muted);font-size:var(--step-0);margin:0}
.card .go{margin-top:auto;padding-top:.7rem;font-weight:700;color:var(--color-accent);text-decoration:none}
.card.dark{background:var(--color-dark);color:var(--color-dark-text);border-color:transparent}
.card.dark p{color:#c3bcd9}
/* segment router cards */
.seg{background:linear-gradient(180deg,var(--color-surface),var(--color-surface-2));border:1px solid var(--color-border);border-radius:var(--radius);padding:1.5rem;text-decoration:none;color:inherit;display:block}
.seg:hover{border-color:var(--color-accent)}
.seg .k{font-size:var(--step--1);text-transform:uppercase;letter-spacing:.06em;color:var(--color-accent);font-weight:700}
.seg h3{margin:.4rem 0 .3rem}
.seg p{color:var(--color-text-muted);font-size:var(--step-0);margin:0}
/* stat row */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;text-align:center}
@media (max-width:760px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat .n{font-size:var(--step-3);font-weight:800;color:var(--color-accent);letter-spacing:-.03em}
.stat .l{color:var(--color-text-muted);font-size:var(--step--1)}
/* steps */
.steps{counter-reset:s}
.step{display:flex;gap:1rem;padding:1.1rem 0;border-top:1px solid var(--color-border)}
.step .num{flex:0 0 auto;width:2.2rem;height:2.2rem;border-radius:50%;background:var(--color-accent);color:#fff;display:grid;place-items:center;font-weight:800}
/* testimonial band */
.band{background:var(--color-dark);color:var(--color-dark-text)}
.band blockquote{font-size:var(--step-2);font-weight:600;line-height:1.3;max-width:24ch;margin:0}
.band .attr{margin-top:1.2rem;color:#b6aed0;font-size:var(--step--1)}
.placeholder-note{font-size:var(--step--1);color:#b6aed0;opacity:.8;margin-top:1rem}
/* pricing */
.price-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.4rem}
@media (max-width:760px){.price-grid{grid-template-columns:1fr}}
.price{border:1px solid var(--color-border);border-radius:var(--radius);padding:1.8rem;background:var(--color-surface)}
.price.dark{background:linear-gradient(160deg,#2c1a58,#1b1138);color:var(--color-dark-text);border-color:var(--color-accent)}
.btn-primary{box-shadow:0 8px 24px rgba(138,44,226,.35)}
.seg:hover,.card:hover{box-shadow:0 12px 30px rgba(0,0,0,.35)}
.price .amt{font-size:var(--step-3);font-weight:800}
.price ul{list-style:none;padding:0;margin:1rem 0 0;display:flex;flex-direction:column;gap:.55rem}
.price li{display:flex;gap:.55rem;align-items:flex-start;font-size:var(--step-0)}
.price li::before{content:"";flex:0 0 auto;width:1.1rem;height:1.1rem;margin-top:.25rem;border-radius:50%;background:var(--color-accent);mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='white' d='M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z'/%3E%3C/svg%3E") center/contain no-repeat}
/* faq */
.faq details{border-top:1px solid var(--color-border);padding:1rem 0}
.faq summary{cursor:pointer;font-weight:700;font-size:var(--step-1);list-style:none;display:flex;justify-content:space-between;gap:1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--color-accent);font-weight:800}
.faq details[open] summary::after{content:"–"}
.faq p{margin:.7rem 0 0;color:var(--color-text-muted)}
/* cta band */
.ctaband{background:radial-gradient(130% 150% at 100% 0%,rgba(138,44,226,.42),transparent 55%),radial-gradient(120% 140% at 0% 100%,rgba(255,213,0,.16),transparent 50%),var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:clamp(2rem,5vw,3.5rem);text-align:center}
.ctaband h2{color:var(--color-text)}.ctaband p{color:var(--color-text-muted);margin-inline:auto}
.ctaband .btn-primary{background:var(--color-accent);color:#fff}
/* breadcrumb */
.crumbs{font-size:var(--step--1);color:var(--color-text-muted);padding-top:1.4rem}
.crumbs a{color:var(--color-text-muted)}
/* footer */
.site-footer{background:var(--color-dark);color:#c3bcd9;border-top:1px solid var(--color-border)}
.foot-grid{display:grid;grid-template-columns:1.6fr repeat(3,1fr);gap:1.6rem;padding-block:3rem}
@media (max-width:760px){.foot-grid{grid-template-columns:1fr 1fr}}
.site-footer h4{color:#fff;font-size:var(--step--1);text-transform:uppercase;letter-spacing:.06em;margin:0 0 .8rem}
.site-footer ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.5rem}
.site-footer a{color:#c3bcd9;text-decoration:none}.site-footer a:hover{color:#fff}
.foot-bottom{border-top:1px solid #2a2340;padding-block:1.2rem;font-size:var(--step--1);text-align:center}
.two{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:center}
@media (max-width:820px){.two{grid-template-columns:1fr}}

.eyebrow,.card h3,.card .go,a.go,.stat .n,.card p.muted{--color-accent:#b07cff;color:#b07cff}