/* ===========================================================
   Spark AI — shared design system
   Palette + type sourced from the official Spark AI logo kit
   (2026-09-09): deep blue, space navy, leaf green, lime, Poppins.
   =========================================================== */

:root{
  --navy:#0F2440;
  --navy-deep:#081426;
  --navy-mid:#16325A;
  --outline-navy:#0D1B33;
  --blue:#1E6FF5;
  --blue-bright:#6FA8F5;
  --green:#8CC63F;
  --lime:#C8F03A;
  --lime-deep:#6E8E1E;
  --paper:#F6F8FC;
  --ink:#0F2440;
  --ink-soft:#4A5578;
  --card-line:#E1E6F0;
  --white:#FFFFFF;

  --display:"Poppins",sans-serif;
  --body:"Poppins",sans-serif;
  --mono:"Poppins",sans-serif;

  --max:1120px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{
  font-family:var(--body);
  color:var(--ink);
  background:var(--white);
  line-height:1.65;
  font-size:17px;
  font-weight:400;
}
img,svg{max-width:100%;display:block}
a{color:var(--blue)}
:focus-visible{outline:3px solid var(--blue-bright);outline-offset:3px;border-radius:4px}
ul{list-style:none}

.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.section{padding:80px 0}
.section-tight{padding:56px 0}

.eyebrow{
  font-family:var(--mono);
  font-size:12.5px;
  font-weight:600;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--lime-deep);
  display:block;
  margin-bottom:14px;
}
.on-dark .eyebrow{color:var(--lime)}

h1,h2,h3,h4{font-family:var(--display);line-height:1.12;letter-spacing:-.01em;font-weight:700}
h2{font-size:clamp(28px,4vw,42px);margin-bottom:16px}
h3{font-size:22px;margin-bottom:8px}
.lede{font-size:18.5px;color:var(--ink-soft)}
.on-dark .lede{color:#C7D0F0}
.on-dark{color:#fff}
.on-dark h1,.on-dark h2,.on-dark h3{color:#fff}

.btn{
  display:inline-block;
  font-family:var(--display);
  font-weight:700;
  font-size:16.5px;
  text-decoration:none;
  border-radius:12px;
  padding:14px 26px;
  transition:transform .15s ease, box-shadow .15s ease;
  border:none;
  cursor:pointer;
}
.btn:hover{transform:translateY(-2px)}
.btn-lime{background:var(--lime);color:var(--navy-deep);box-shadow:0 6px 20px rgba(207,246,72,.35)}
.btn-blue{background:var(--blue);color:#fff;box-shadow:0 6px 18px rgba(32,131,253,.32)}
.btn-ghost{color:#fff;border:2px solid rgba(255,255,255,.35);background:transparent;padding:12px 24px}
.btn-ghost:hover{border-color:var(--lime)}
.btn-outline{color:var(--navy);border:2px solid var(--card-line);background:#fff;padding:12px 24px}
.btn-outline:hover{border-color:var(--blue)}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--card-line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;max-width:var(--max);margin:0 auto;gap:16px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}
.brand img{height:36px;width:auto;display:block}
.brand-name{font-family:var(--display);font-weight:700;font-size:21px;color:var(--ink);letter-spacing:-.02em}
.brand-name .ai{color:var(--green)}
.nav-links{display:flex;align-items:center;gap:22px;flex-wrap:wrap}
.nav-links a{
  color:var(--ink-soft);
  text-decoration:none;
  font-weight:600;
  font-size:15px;
}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--blue)}
.nav .btn{padding:10px 20px;font-size:14.5px}
.nav-toggle{display:none;background:none;border:none;font-size:26px;cursor:pointer;color:var(--ink)}

@media (max-width:860px){
  .nav-links{
    display:none;
    position:absolute;top:100%;left:0;right:0;
    background:#fff;border-bottom:1px solid var(--card-line);
    flex-direction:column;align-items:flex-start;padding:16px 24px;gap:14px;
  }
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
}

/* ---------- hero ---------- */
.hero{
  background:radial-gradient(1100px 560px at 78% -10%, #16225E 0%, var(--navy) 45%, var(--navy-deep) 100%);
  color:#fff;position:relative;overflow:hidden;
}
.stars{position:absolute;inset:0;pointer-events:none}
.star{position:absolute;width:3px;height:3px;border-radius:50%;background:#fff;opacity:.7;animation:twinkle 3.5s ease-in-out infinite}
.star.lime{background:var(--lime)}
@keyframes twinkle{0%,100%{opacity:.25}50%{opacity:.9}}

.shooting-star{
  position:absolute;top:18%;left:-4%;width:110px;height:2px;border-radius:2px;
  background:linear-gradient(90deg, rgba(255,255,255,0), rgba(255,255,255,.9));
  opacity:0;pointer-events:none;
  animation:shoot 10s linear infinite;
  animation-delay:1.5s;
}
.shooting-star::after{
  content:"";position:absolute;right:-2px;top:-2px;width:5px;height:5px;
  background:#fff;border-radius:50%;box-shadow:0 0 8px 2px rgba(255,255,255,.8);
}
.shooting-star.delay{top:58%;left:-8%;width:80px;animation-delay:5s;animation-duration:12s}
@keyframes shoot{
  0%{opacity:0;transform:translate(0,0) rotate(18deg)}
  4%{opacity:1}
  22%{opacity:0;transform:translate(38vw,14vh) rotate(18deg)}
  100%{opacity:0;transform:translate(38vw,14vh) rotate(18deg)}
}

.hero-grid{display:flex;flex-direction:column;align-items:center;text-align:center;padding-top:72px;padding-bottom:88px;position:relative}
.hero-grid > div{max-width:760px}
.hero h1{font-size:clamp(34px,5vw,54px);margin-bottom:18px}
.hero h1 .pop{color:var(--blue-bright)}
.hero h1 .pop2{color:var(--lime)}
.hero .sub{font-size:19px;color:#C7D0F0;max-width:640px;margin:0 auto 30px}
.hero .sub strong{font-weight:700}
.hero .sub .hl-create{color:var(--blue-bright)}
.hero .sub .hl-safe{color:var(--lime)}
.hero-ctas{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.hero-grid .hero-ctas{justify-content:center}

/* ---------- page header (non-home pages) ---------- */
.page-header{
  background:linear-gradient(180deg, var(--navy) 0%, var(--navy-deep) 100%);
  color:#fff;padding:56px 0 60px;position:relative;overflow:hidden;
}
.page-header h1{font-size:clamp(30px,4.5vw,44px);margin-bottom:10px}

/* ---------- pillars / cards ---------- */
.pillars{background:var(--paper)}
.pillars:first-of-type{padding-bottom:40px}
#details{padding-top:40px}
.card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:40px}
.card-grid.cols-3{grid-template-columns:repeat(3,1fr)}
.card-grid.cols-2{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--card-line);border-radius:16px;padding:28px 26px}
.card .glyph{
  font-family:var(--mono);font-weight:600;font-size:14px;color:var(--blue);
  background:var(--paper);border:1px solid var(--card-line);border-radius:10px;
  display:inline-block;padding:8px 12px;margin-bottom:16px;
}
.card h3{font-size:20px;margin-bottom:8px}
.card p{color:var(--ink-soft);font-size:15px}

.tools-row{margin-top:32px;display:flex;flex-wrap:wrap;gap:10px;align-items:center;font-size:14px;color:var(--ink-soft)}
.chip{font-family:var(--mono);font-size:12.5px;background:#fff;border:1px solid var(--card-line);border-radius:999px;padding:6px 14px;color:var(--ink)}
.chip.on-dark-chip{background:rgba(255,255,255,.06);border-color:rgba(207,220,255,.25);color:#fff}

/* ---------- tagline band ---------- */
.tagline-band{background:var(--lime);padding:76px 24px;text-align:center;position:relative;overflow:hidden}
.tagline-band .tagline-text{font-family:var(--display);font-weight:700;font-size:clamp(30px,5vw,58px);line-height:1.14;letter-spacing:-.02em;color:var(--navy-deep);max-width:900px;margin:0 auto}
.tagline-band .word{color:var(--blue)}

/* ---------- safety ---------- */
.safety{background:radial-gradient(1100px 560px at 78% -10%, #16225E 0%, var(--navy) 45%, var(--navy-deep) 100%);color:#fff;padding-bottom:40px}
.safety .lede .hl-green{color:var(--green);font-weight:700}
.safety-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:36px}
.safe-card{border:1px solid rgba(207,220,255,.2);border-radius:16px;padding:24px;background:rgba(255,255,255,.04)}
.safe-card h3{font-size:18px;margin-bottom:8px;color:var(--lime)}
.safe-card p{font-size:15px;color:#C7D0F0}

/* ---------- values ---------- */
.value-block{display:grid;grid-template-columns:auto 1fr;gap:22px;padding:26px 0;border-bottom:1px solid var(--card-line)}
.value-block:last-child{border-bottom:none}
.value-num{font-family:var(--mono);font-size:28px;font-weight:700;color:var(--blue);line-height:1}
.value-block h3{margin-bottom:6px}
.value-block p{color:var(--ink-soft);font-size:16px}

/* ---------- FAQ ---------- */
.faq{max-width:760px;margin:32px auto 0}
.faq details{border-bottom:1px solid var(--card-line);padding:20px 4px}
.faq summary{font-family:var(--display);font-weight:700;font-size:18px;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--blue);font-size:22px;line-height:1}
.faq details[open] summary::after{content:"–"}
.faq details p{margin-top:12px;color:var(--ink-soft);font-size:16px}

/* ---------- signup / footer ---------- */
.signup{background:radial-gradient(900px 500px at 50% 120%, #16225E 0%, var(--navy-deep) 60%);color:#fff;text-align:center;position:relative;overflow:hidden;padding-top:40px}
.signup h2{font-size:clamp(30px,4.4vw,46px)}
.signup .lede{margin:0 auto 32px}
footer{background:var(--navy-deep);color:#9AA6D8;font-size:13.5px;padding:36px 20px 26px;border-top:1px solid rgba(207,220,255,.12)}
.footer-inner{max-width:var(--max);margin:0 auto;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}
.footer-links{display:flex;gap:18px;flex-wrap:wrap}
.footer-links a{color:#9AA6D8;text-decoration:none}
.footer-links a:hover{color:var(--lime)}

@media (prefers-reduced-motion: reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}
@media (max-width:900px){
  .card-grid,.card-grid.cols-3,.card-grid.cols-2{grid-template-columns:1fr 1fr}
  .safety-grid{grid-template-columns:1fr}
}
@media (max-width:700px){
  .wrap{padding:0 20px}
  .section{padding:56px 0}
  .section-tight{padding:40px 0}
  .hero-grid{padding-top:52px;padding-bottom:64px}
  .shooting-star{width:70px}
  .shooting-star.delay{width:54px}
  .page-header{padding:44px 0 48px}
  .card-grid,.card-grid.cols-3,.card-grid.cols-2{grid-template-columns:1fr;gap:16px}
  .brand-name{font-size:18px}
  .value-block{grid-template-columns:1fr;gap:8px;padding:22px 0}
  .footer-inner{flex-direction:column;align-items:flex-start;gap:20px}
  .tagline-band{padding:56px 20px}
  .safety-grid{gap:16px}
}
@media (max-width:460px){
  .nav-inner{padding:12px 20px}
  .btn{padding:13px 22px;font-size:15.5px}
  .hero-ctas .btn,.hero-ctas .btn-ghost{width:100%;text-align:center}
}