/* PatentPulse AI landing: plain CSS, mobile-first, system fonts */
:root{
  --bg:#0b1220; --bg2:#0f172a; --panel:#131d33; --line:#1f2a44;
  --text:#e2e8f0; --muted:#a3b1c6; --head:#f8fafc;
  --accent:#38bdf8; --accent-ink:#04121d;
  --r:12px; --max:1120px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 var(--font);-webkit-font-smoothing:antialiased}
a{color:var(--accent)}
a:focus-visible,summary:focus-visible,.btn:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
h1,h2,h3{color:var(--head);line-height:1.15;margin:0 0 .5em;letter-spacing:-.02em}
h1{font-size:clamp(2.6rem,9vw,4.6rem);font-weight:800}
h2{font-size:clamp(1.7rem,4.5vw,2.4rem);font-weight:750}
h3{font-size:1.1rem;font-weight:650;letter-spacing:-.01em}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0;list-style:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.narrow{max-width:760px}
section{padding:72px 0}
.alt{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;color:#000;padding:8px;z-index:99}

/* nav */
.nav{position:sticky;top:0;z-index:10;background:rgba(11,18,32,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:60px}
.brand{display:flex;gap:8px;align-items:center;color:var(--head);font-weight:750;text-decoration:none}
.nav nav{display:flex;align-items:center;gap:22px}
.nav-link{display:none;color:var(--muted);text-decoration:none;font-size:.95rem}
.nav-link:hover{color:var(--head)}

/* buttons */
.btn{display:inline-block;background:var(--accent);color:var(--accent-ink);font-weight:700;text-decoration:none;padding:14px 22px;border-radius:10px;border:1px solid var(--accent);text-align:center;transition:filter .15s}
.btn:hover{filter:brightness(1.1)}
.btn-ghost{background:transparent;color:var(--head);border-color:#3b4a68}
.btn-ghost:hover{border-color:var(--accent)}
.btn-sm{padding:8px 14px;font-size:.9rem}
.cta-row{display:flex;flex-direction:column;gap:12px;margin:28px 0 14px}
.center{justify-content:center}

/* hero */
.hero{padding:88px 0 80px;background:radial-gradient(900px 400px at 15% -10%,rgba(56,189,248,.14),transparent 60%)}
.eyebrow{color:var(--accent);font-weight:650;font-size:.82rem;letter-spacing:.12em;text-transform:uppercase}
.lead{font-size:clamp(1.08rem,2.4vw,1.3rem);color:var(--muted);max-width:44ch}
.micro{color:var(--muted);font-size:.92rem}
.intro{color:var(--muted);max-width:60ch;font-size:1.06rem;margin-bottom:36px}

/* who */
.strip{padding:48px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.label{font-size:.85rem;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);font-weight:650;margin-bottom:24px}
.grid4{display:grid;gap:22px}
.grid4 h3{margin-bottom:.3em}
.grid4 p{color:var(--muted);margin:0;font-size:.97rem}

/* cards */
.cards{display:grid;gap:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:24px}
.card p{color:var(--muted);margin:0}
.num{display:block;color:var(--accent);font-weight:700;font-size:.85rem;margin-bottom:10px;font-variant-numeric:tabular-nums}
.card-wide{border-color:rgba(56,189,248,.45)}

/* steps */
.steps{display:grid;gap:28px;counter-reset:s}
.steps li{position:relative;padding-left:56px;counter-increment:s}
.steps li::before{content:counter(s);position:absolute;left:0;top:-2px;width:38px;height:38px;border-radius:50%;border:1px solid var(--accent);color:var(--accent);display:grid;place-items:center;font-weight:700}
.steps p{color:var(--muted);margin:0}

/* sample */
.sample{display:grid;gap:32px;align-items:center}
.placeholder{aspect-ratio:8.5/11;max-width:360px;width:100%;justify-self:center;border:1px dashed #3b4a68;border-radius:var(--r);background:repeating-linear-gradient(135deg,var(--panel),var(--panel) 12px,#111a2e 12px,#111a2e 24px);display:grid;place-items:center;text-align:center;color:var(--muted)}

/* pricing */
.plans{display:grid;gap:20px}
.plan{position:relative;background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:28px;display:flex;flex-direction:column}
.plan ul{margin:18px 0 26px;flex:1}
.plan li{padding:7px 0 7px 26px;position:relative;color:var(--text);font-size:.97rem;border-top:1px solid var(--line)}
.plan li::before{content:"✓";position:absolute;left:2px;color:var(--accent);font-weight:700}
.price{font-size:2.6rem;font-weight:800;color:var(--head);margin:.1em 0 .1em;letter-spacing:-.02em}
.price span{font-size:1rem;font-weight:500;color:var(--muted)}
.tag{color:var(--muted);margin:0}
.plan-rec{border:2px solid var(--accent);background:linear-gradient(180deg,rgba(56,189,248,.09),var(--panel) 45%)}
.badge{position:absolute;top:-12px;left:24px;background:var(--accent);color:var(--accent-ink);font-size:.75rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;padding:4px 10px;border-radius:999px}
.fine{font-size:.8rem;color:var(--muted);margin:14px 0 0;line-height:1.5}

/* faq */
details{border-bottom:1px solid var(--line);padding:4px 0}
summary{cursor:pointer;list-style:none;padding:16px 32px 16px 0;font-weight:650;color:var(--head);position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:4px;top:12px;font-size:1.4rem;color:var(--accent)}
details[open] summary::after{content:"–"}
details p{color:var(--muted);margin:0 0 18px}

/* final + footer */
.final{text-align:center;background:radial-gradient(700px 300px at 50% 120%,rgba(56,189,248,.16),transparent 70%)}
.final .lead{margin:0 auto}
footer{border-top:1px solid var(--line);padding:40px 0 48px;font-size:.88rem;color:var(--muted)}
.disclaimer{max-width:80ch;line-height:1.55}
.copy{margin:0}

@media (min-width:640px){
  .cta-row{flex-direction:row;flex-wrap:wrap}
  .grid4{grid-template-columns:repeat(2,1fr)}
  .cards{grid-template-columns:repeat(2,1fr)}
  .card-wide{grid-column:1/-1}
}
@media (min-width:900px){
  section{padding:104px 0}
  .hero{padding:128px 0 112px}
  .nav-link{display:inline}
  .grid4{grid-template-columns:repeat(4,1fr)}
  .cards{grid-template-columns:repeat(3,1fr)}
  .card-wide{grid-column:span 2}
  .steps{grid-template-columns:repeat(3,1fr)}
  .sample{grid-template-columns:1.2fr 1fr}
  .plans{grid-template-columns:repeat(3,1fr);align-items:stretch}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}