/* ============================================================
   CortexaAI Works — brand design system  ·  SolarPredict AI
   Dark-default indigo theme + light mode, purple accent,
   Playfair Display / Inter / IBM Plex Mono.
   ============================================================ */
:root{
  --bg:#0A0E1F; --bg-2:#0C1128; --surface:#111834; --surface-2:#0E1430;
  --line:rgba(255,255,255,.09); --line-2:rgba(255,255,255,.16);
  --text:#EAECF6; --muted:#A6ADC8; --faint:#79809F;
  --brand:#8B6DFF; --brand-lo:#A99CFF; --brand-hi:#5B3FD0;
  --grad:linear-gradient(135deg,#A99CFF 0%,#5B3FD0 100%);
  --grad-soft:linear-gradient(135deg,rgba(169,156,255,.16),rgba(91,63,208,.10));
  --ring:rgba(139,109,255,.38);
  --good:#3FD08B; --warn:#F5B34A; --bad:#F2688A; --info:#6AA8FF;
  --f-display:'Playfair Display',Georgia,serif;
  --f-body:'Inter',system-ui,-apple-system,sans-serif;
  --f-mono:'IBM Plex Mono',ui-monospace,monospace;
  --r-sm:9px; --r:14px; --r-lg:20px; --wrap:1180px;
  --sh:0 18px 50px -20px rgba(0,0,0,.55);
  --sh-card:0 2px 10px rgba(0,0,0,.25);
}
[data-theme="light"]{
  --bg:#F6F6FB; --bg-2:#FFFFFF; --surface:#FFFFFF; --surface-2:#FBFBFE;
  --line:#E7E7F1; --line-2:#DCDCEC;
  --text:#161829; --muted:#565C7E; --faint:#8A90AE;
  --brand:#6B4CF0; --brand-lo:#8B6DFF; --brand-hi:#4B2FC0;
  --grad:linear-gradient(135deg,#8B6DFF 0%,#5B3FD0 100%);
  --grad-soft:linear-gradient(135deg,rgba(107,76,240,.10),rgba(91,63,208,.06));
  --sh:0 20px 50px -24px rgba(30,20,90,.30);
  --sh-card:0 1px 3px rgba(20,22,43,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--f-body);background:var(--bg);color:var(--text);line-height:1.6;
  -webkit-font-smoothing:antialiased;transition:background .3s,color .3s}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
img,svg{display:block}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
::selection{background:var(--ring);color:#fff}
::-webkit-scrollbar{width:11px;height:11px}
::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:20px;border:3px solid var(--bg)}

/* ---------- typography ---------- */
h1,h2,h3,h4{font-family:var(--f-display);font-weight:700;line-height:1.12;letter-spacing:-.01em;color:var(--text)}
.eyebrow{font-family:var(--f-mono);font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--brand-lo);font-weight:500;display:inline-block}
.meta{font-family:var(--f-mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--faint)}
.meta b{color:var(--brand-lo)}
.hl{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:clamp(16px,1.6vw,19px);color:var(--muted);max-width:60ch}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;font-weight:600;font-size:14.5px;
  padding:12px 22px;border-radius:var(--r-sm);transition:.18s;white-space:nowrap;border:1px solid transparent}
.btn-sm{padding:9px 15px;font-size:13px}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 26px -10px var(--ring)}
.btn-primary:hover{transform:translateY(-1px);filter:brightness(1.07)}
.btn-ghost{background:transparent;border-color:var(--line-2);color:var(--text)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand-lo);background:var(--grad-soft)}
.link-arrow{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:13.5px;font-weight:500}
.link-arrow:hover{color:var(--brand-lo)}.link-arrow span{transition:.2s}.link-arrow:hover span{transform:translateX(-3px)}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 82%,transparent);
  backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:22px;height:66px}
.brand{display:flex;align-items:center;gap:11px;font-weight:600}
.brand-mark{width:34px;height:34px;flex:0 0 auto}
.brand span{font-size:16.5px;letter-spacing:-.01em}
.brand .ai{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.brand .sub{color:var(--muted);font-weight:500}
.nav-links{display:flex;gap:26px;margin-left:8px}
.nav-links a{font-size:14px;color:var(--muted);font-weight:500}.nav-links a:hover{color:var(--text)}
.nav-spacer{flex:1}
.nav-cta{display:flex;align-items:center;gap:10px}
.theme-toggle{width:38px;height:38px;border-radius:10px;border:1px solid var(--line-2);display:flex;align-items:center;justify-content:center;color:var(--muted)}
.theme-toggle:hover{color:var(--brand-lo);border-color:var(--brand)}
.theme-toggle svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
[data-theme="dark"] .i-sun{display:block}[data-theme="dark"] .i-moon{display:none}
[data-theme="light"] .i-sun{display:none}[data-theme="light"] .i-moon{display:block}
.nav-toggle{display:none;flex-direction:column;gap:5px;width:40px;height:40px;align-items:center;justify-content:center;border-radius:9px;border:1px solid var(--line-2)}
.nav-toggle span{width:18px;height:2px;background:var(--text);border-radius:2px;transition:.2s}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:96px 0 78px}
.hero::before{content:"";position:absolute;inset:0;z-index:-1;
  background:radial-gradient(900px 480px at 18% -8%,rgba(139,109,255,.22),transparent 60%),
             radial-gradient(760px 460px at 96% 8%,rgba(91,63,208,.20),transparent 55%)}
.hero .glyph{width:58px;height:58px;border-radius:16px;background:var(--grad-soft);border:1px solid var(--line-2);
  display:flex;align-items:center;justify-content:center;margin-bottom:22px}
.hero .glyph svg{width:26px;height:26px;fill:none;stroke:var(--brand-lo);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.hero h1{font-size:clamp(44px,7vw,86px);margin:16px 0 18px;font-weight:800}
.hero .lead{margin-top:10px}
.hero-cta{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}

/* ---------- sections ---------- */
.section{padding:74px 0}
.section-head{max-width:720px;margin-bottom:44px}
.section-head h2{font-size:clamp(28px,3.4vw,40px);margin-top:14px}
.section-head .eyebrow{margin-bottom:4px}

/* ---------- grid + cards ---------- */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:26px;box-shadow:var(--sh-card);transition:.22s}
.card:hover{border-color:var(--line-2);transform:translateY(-2px)}
.icon-tile{width:50px;height:50px;border-radius:14px;background:var(--grad-soft);border:1px solid var(--line-2);
  display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.icon-tile svg{width:24px;height:24px;fill:none;stroke:var(--brand-lo);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:20px;margin-bottom:8px}
.card p{color:var(--muted);font-size:14.5px}
.ticks{list-style:none;display:flex;flex-direction:column;gap:12px}
.ticks li{display:flex;gap:11px;align-items:flex-start;color:var(--muted);font-size:14.5px}
.ticks svg{width:20px;height:20px;flex:0 0 auto;margin-top:2px;fill:none;stroke:var(--brand-lo);stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.status-live{display:inline-flex;align-items:center;gap:8px;font-family:var(--f-mono);font-size:11.5px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--good);background:color-mix(in srgb,var(--good) 15%,transparent);
  padding:6px 12px;border-radius:20px;font-weight:500}
.status-live::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--good);box-shadow:0 0 10px var(--good)}

/* ---------- banner ---------- */
.banner{background:var(--grad);border-radius:var(--r-lg);padding:40px 44px;display:flex;align-items:center;
  justify-content:space-between;gap:28px;flex-wrap:wrap;box-shadow:var(--sh)}
.banner h3{color:#fff;font-size:26px}.banner p{color:rgba(255,255,255,.86);margin-top:8px;max-width:60ch}
.banner .btn-primary{background:#fff;color:var(--brand-hi)}.banner .btn-primary:hover{background:#f3f0ff}

/* ---------- footer ---------- */
.site-footer{border-top:1px solid var(--line);background:var(--bg-2);padding:56px 0 30px;margin-top:20px}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:36px}
.foot-brand p{color:var(--muted);font-size:13.5px;margin:14px 0 16px;max-width:34ch}
.socials{display:flex;gap:9px}
.socials a{width:36px;height:36px;border-radius:10px;border:1px solid var(--line-2);display:flex;align-items:center;justify-content:center;color:var(--muted)}
.socials a:hover{color:var(--brand-lo);border-color:var(--brand)}
.socials svg{width:17px;height:17px;fill:currentColor}
.foot-col h4{font-family:var(--f-body);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:14px;font-weight:600}
.foot-col a{display:block;color:var(--muted);font-size:14px;margin-bottom:10px}.foot-col a:hover{color:var(--brand-lo)}
.foot-bottom{border-top:1px solid var(--line);margin-top:40px;padding-top:22px;color:var(--faint);font-size:13px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.05s}.reveal.d2{transition-delay:.13s}.reveal.d3{transition-delay:.21s}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none}}

@media(max-width:900px){
  .nav-links,.btn-desktop{display:none}.nav-toggle{display:flex}
  .grid-3,.grid-2,.foot-grid{grid-template-columns:1fr}
  .nav-links.open{display:flex;position:absolute;top:66px;left:0;right:0;flex-direction:column;background:var(--bg-2);
    border-bottom:1px solid var(--line);padding:16px 24px;gap:16px}
  .banner{padding:30px}
}