/*
  Vanilla conversion of the original React/Tailwind landing page.
  No frameworks. Only HTML + CSS + JS.
*/

:root{
  --bg:#ffffff;
  --fg:#0f172a;
  --muted:#475569;
  --border:rgba(15,23,42,.12);
  --card:#ffffff;
  --muted-bg:rgba(15,23,42,.04);
  --primary:#2563eb;
  --primary2:#7c3aed;
  --green:#16a34a;
  --shadow: 0 10px 30px rgba(15,23,42,.10);
  --shadow-sm: 0 6px 18px rgba(15,23,42,.10);
  --radius: 18px;
  --radius-sm: 12px;
  --radius-lg: 26px;
  --maxw: 1280px;
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  /* Hero readability (glass panel + stronger contrast) */
  --hero-panel-bg: rgba(255,255,255,.46);
  --hero-panel-border: rgba(15,23,42,.12);
  --hero-panel-shadow: 0 26px 70px rgba(15,23,42,.10);
  --hero-lead: #334155;
  --hero-badge-bg: rgba(255,255,255,.62);
  --hero-badge-border: rgba(37,99,235,.22);
  --hero-badge-text: #0f172a;
  --hero-badge-accent: #2563eb;
  --hero-outline-bg: rgba(255,255,255,.40);
  --hero-outline-border: rgba(15,23,42,.18);
  --hero-grad-1: #1d4ed8;
  --hero-grad-2: #7c3aed;
  --hero-grad-3: #4f46e5;
}

html.dark{
  --bg:#070a13;
  --fg:#e7eaf2;
  --muted:#a8b0c2;
  --border:rgba(255,255,255,.12);
  --card:rgba(255,255,255,.06);
  --muted-bg:rgba(255,255,255,.06);
  --shadow: 0 16px 40px rgba(0,0,0,.35);
  --shadow-sm: 0 10px 26px rgba(0,0,0,.35);
  
  /* Hero readability in dark mode */
  --hero-panel-bg: rgba(7,10,19,.58);
  --hero-panel-border: rgba(255,255,255,.12);
  --hero-panel-shadow: 0 26px 70px rgba(0,0,0,.40);
  --hero-lead: color-mix(in oklab, var(--fg) 70%, var(--muted));
  --hero-badge-bg: rgba(255,255,255,.08);
  --hero-badge-border: rgba(37,99,235,.35);
  --hero-badge-text: var(--fg);
  --hero-badge-accent: #60a5fa;
  --hero-outline-bg: rgba(255,255,255,.08);
  --hero-outline-border: rgba(255,255,255,.16);
  --hero-grad-1: #60a5fa;
  --hero-grad-2: #a78bfa;
  --hero-grad-3: #818cf8;
}

*{ box-sizing:border-box; }
body{
  margin:0;
  font-family:var(--font);
  color:var(--fg);
  background:var(--bg);
  line-height:1.5;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
code, pre{ font-family:var(--mono); }

.container{
  width:100%;
  max-width:var(--maxw);
  margin:0 auto;
  padding:0 16px;
}
@media (min-width: 640px){
  .container{ padding:0 24px; }
}
@media (min-width: 1024px){
  .container{ padding:0 32px; }
}

.sr-only{
  position:absolute;
  width:1px; height:1px;
  padding:0; margin:-1px;
  overflow:hidden; clip:rect(0,0,0,0);
  white-space:nowrap; border:0;
}

/* Nav */
.nav{
  position:sticky;
  top:0;
  z-index:50;
  border-bottom:1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
}
.nav-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:64px;
  gap:16px;
}
.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:800;
  letter-spacing:-.01em;
}
.brand-mark{
  width:32px; height:32px;
  border-radius:10px;
  background: linear-gradient(135deg, var(--primary), var(--primary2));
  display:grid;
  place-items:center;
  color:#fff;
}
.nav-links{
  display:none;
  align-items:center;
  gap:28px;
  font-size:14px;
}
.nav-links a{ color: color-mix(in oklab, var(--fg) 85%, var(--muted)); }
.nav-links a:hover{ color: var(--primary); }

.nav-actions{
  display:flex;
  align-items:center;
  gap:10px;
}

@media (min-width: 768px){
  .nav-links{ display:flex; }
  .burger{ display:none; }
}

/* Buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  border-radius:12px;
  padding:10px 14px;
  font-weight:700;
  font-size:14px;
  border:1px solid transparent;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease, color .15s ease;
  user-select:none;
  white-space:nowrap;
}
.btn:active{ transform: translateY(1px); }
.btn-primary{
  color:#fff;
  background: linear-gradient(90deg, var(--hero-grad-1), var(--hero-grad-2), var(--hero-grad-3));
  box-shadow: 0 8px 18px rgba(37,99,235,.18);
}
.btn-primary:hover{
  box-shadow: 0 12px 26px rgba(37,99,235,.22);
}
.btn-outline{
  background:transparent;
  border-color: var(--border);
}
.btn-outline:hover{
  border-color: color-mix(in oklab, var(--primary) 35%, var(--border));
}
.btn-ghost{
  background:transparent;
  border-color:transparent;
  color: color-mix(in oklab, var(--fg) 88%, var(--muted));
}
.btn-ghost:hover{
  background: var(--muted-bg);
}

/* Mobile menu */
.burger{
  display:inline-flex;
  width:40px; height:40px;
  border-radius:12px;
  border:1px solid var(--border);
  background: transparent;
  align-items:center;
  justify-content:center;
}
.mobile-menu{
  display:none;
  border-bottom:1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 86%, transparent);
}
.mobile-menu.open{ display:block; }
.mobile-menu .container{
  padding-top:10px;
  padding-bottom:14px;
  display:flex;
  flex-direction:column;
  gap:10px;
}
.mobile-menu a{
  padding:10px 12px;
  border-radius:12px;
  font-weight:650;
  color: color-mix(in oklab, var(--fg) 85%, var(--muted));
}
.mobile-menu a:hover{ background: var(--muted-bg); color: var(--primary); }

/* Sections */
.section{
  padding:80px 0;
  border-top:1px solid var(--border);
}
.section.muted{
  background: color-mix(in oklab, var(--muted-bg) 75%, transparent);
}
@media (min-width: 768px){
  .section{ padding:120px 0; }
}

.h1{
  font-size:44px;
  line-height:1.08;
  letter-spacing:-.02em;
  margin:0;
}
@media (min-width: 768px){
  .h1{ font-size:60px; }
}
.h2{
  font-size:34px;
  line-height:1.12;
  letter-spacing:-.02em;
  margin:0 0 16px;
}
@media (min-width: 768px){
  .h2{ font-size:46px; }
}

.lead{
  font-size:18px;
  color: var(--muted);
  margin:0;
}
@media (min-width: 768px){
  .lead{ font-size:20px; }
}

.badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  border-radius:999px;
  font-weight:700;
  font-size:13px;
  background: color-mix(in oklab, var(--primary) 10%, transparent);
  color: color-mix(in oklab, var(--primary) 80%, var(--fg));
  border:1px solid color-mix(in oklab, var(--primary) 15%, var(--border));
}

/* Hero */
.hero{
  position:relative;
  overflow:hidden;
  padding:104px 0 144px;
}
@media (min-width: 768px){
  .hero{ padding:160px 0 210px; }
}
.hero-bg{
  position:absolute;
  inset:0;
  z-index:-2;
}
.hero-bg img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.hero-bg::after{
  content:"";
  position:absolute;
  inset:0;
  background: linear-gradient(180deg,
    color-mix(in oklab, var(--bg) 86%, transparent),
    color-mix(in oklab, var(--bg) 65%, transparent),
    color-mix(in oklab, var(--bg) 40%, transparent)
  );
  z-index:1;
}
.hero-inner{
  max-width: 860px;
  margin:0 auto;
  text-align:center;
  display:flex;
  flex-direction:column;
  gap:22px;
}

.hero-panel{
  background: var(--hero-panel-bg);
  border: 1px solid var(--hero-panel-border);
  border-radius: var(--radius-lg);
  padding: 30px 22px;
  box-shadow: var(--hero-panel-shadow);
  backdrop-filter: blur(14px);
}
@media (min-width: 768px){
  .hero-panel{ padding: 52px 46px; }
}

/* Hero-specific color tuning */
.hero .badge{
  background: var(--hero-badge-bg);
  border-color: var(--hero-badge-border);
  color: var(--hero-badge-text);
  box-shadow: 0 10px 24px rgba(15,23,42,.08);
}
.hero .badge .icon, .hero .badge svg{ color: var(--hero-badge-accent); }
.hero .lead{ color: var(--hero-lead); }
.hero .btn-outline{
  background: var(--hero-outline-bg);
  border-color: var(--hero-outline-border);
  color: var(--fg);
  backdrop-filter: blur(10px);
}
.hero .btn-outline:hover{
  background: color-mix(in oklab, var(--hero-outline-bg) 70%, rgba(255,255,255,.30));
  border-color: color-mix(in oklab, var(--primary) 35%, var(--hero-outline-border));
}
.hero .btn-primary{ box-shadow: 0 14px 30px rgba(37,99,235,.22); }
.hero .btn-primary:hover{ box-shadow: 0 18px 40px rgba(37,99,235,.28); }
.gradient-text{
  background: linear-gradient(90deg, var(--hero-grad-1), var(--hero-grad-2), var(--hero-grad-3));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
  filter: drop-shadow(0 1px 0 rgba(15,23,42,.10));
}
.hero-actions{
  display:flex;
  flex-direction:column;
  gap:12px;
  justify-content:center;
  margin-top:10px;
}
@media (min-width: 640px){
  .hero-actions{ flex-direction:row; }
}
.btn-lg{
  padding:12px 18px;
  border-radius:14px;
  font-size:16px;
}
.trust{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:18px 24px;
  margin-top:22px;
  color: var(--muted);
  font-size:14px;
}
.trust-item{
  display:flex;
  gap:8px;
  align-items:center;
}

/* Cards & grids */
.grid{
  display:grid;
  gap:18px;
}
@media (min-width: 768px){
  .grid.cols-2{ grid-template-columns: repeat(2, minmax(0, 1fr)); gap:22px; }
  .grid.cols-3{ grid-template-columns: repeat(3, minmax(0, 1fr)); gap:18px; }
  .grid.cols-4{ grid-template-columns: repeat(4, minmax(0, 1fr)); gap:18px; }
}

.card{
  background: var(--card);
  border:1px solid var(--border);
  border-radius: var(--radius);
  padding:28px;
  box-shadow: none;
}
.card.hover:hover{
  border-color: color-mix(in oklab, var(--primary) 35%, var(--border));
  box-shadow: var(--shadow-sm);
}
.card.feature{
  position:relative;
  overflow:hidden;
}
.card.feature::before{
  content:"";
  position:absolute;
  inset:0;
  background: radial-gradient(1200px 500px at 10% 10%,
    color-mix(in oklab, var(--primary) 12%, transparent),
    transparent 60%);
  opacity:0;
  transition: opacity .25s ease;
}
.card.feature.purple::before{
  background: radial-gradient(1200px 500px at 10% 10%,
    color-mix(in oklab, var(--primary2) 12%, transparent),
    transparent 60%);
}
.card.feature:hover::before{ opacity:1; }
.card.feature > *{ position:relative; z-index:1; }

.icon-box{
  width:48px; height:48px;
  border-radius:14px;
  display:grid;
  place-items:center;
  margin-bottom:14px;
  background: color-mix(in oklab, var(--primary) 12%, transparent);
  border:1px solid color-mix(in oklab, var(--primary) 18%, var(--border));
}
.icon-box.purple{
  background: color-mix(in oklab, var(--primary2) 12%, transparent);
  border-color: color-mix(in oklab, var(--primary2) 18%, var(--border));
}
.kicker{
  color: var(--muted);
  margin:0 0 14px;
}
.ul{
  margin:14px 0 0;
  padding:0;
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:10px;
  font-size:14px;
}
.li{
  display:flex;
  gap:10px;
  align-items:flex-start;
}
.check{
  width:18px; height:18px;
  margin-top:2px;
  color: var(--green);
  flex:0 0 auto;
}

/* Demo */
.form{
  display:flex;
  flex-direction:column;
  gap:14px;
}
.field label{
  display:block;
  font-size:13px;
  font-weight:800;
  margin-bottom:6px;
}
.input, .select{
  width:100%;
  padding:12px 12px;
  border-radius:14px;
  border:1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 92%, transparent);
  color: var(--fg);
  outline:none;
  transition: box-shadow .15s ease, border-color .15s ease;
}
.input:focus, .select:focus{
  border-color: color-mix(in oklab, var(--primary) 45%, var(--border));
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--primary) 18%, transparent);
}
@media (min-width: 768px){
  .form-grid{ display:grid; grid-template-columns: 1fr 1fr; gap:14px; }
}

.demo-result{
  margin-top:18px;
  padding:18px;
  border-radius:16px;
  border:1px solid color-mix(in oklab, var(--primary) 20%, var(--border));
  background: linear-gradient(135deg,
    color-mix(in oklab, var(--primary) 10%, transparent),
    color-mix(in oklab, var(--primary2) 10%, transparent));
  display:none;
}
.demo-result.show{ display:block; }
.demo-meta{
  display:flex;
  gap:12px;
  align-items:flex-start;
  margin-bottom:10px;
  color: var(--muted);
}
.demo-meta .title{
  font-weight:900;
  font-size:13px;
  margin:0;
}
.demo-meta .sub{
  font-size:12px;
  margin:0;
}
.demo-text{
  margin:0;
  color: var(--fg);
}


/* Pricing */
.pricing-grid{
  display:grid;
  gap:18px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  align-items:stretch;
  max-width:1240px;
  margin:46px auto 0;
}
@media (min-width: 640px){
  .pricing-grid{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 768px){
  .pricing-grid{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (min-width: 1140px){
  .pricing-grid{ grid-template-columns: repeat(5, minmax(0, 1fr)); gap:16px; }
}

.card.plan{
  padding:22px;
}
.plan-name{
  margin:0 0 6px;
  font-size:20px;
  font-weight:950;
  letter-spacing:-.01em;
}
.plan-meta{
  margin:0;
  color: var(--muted);
  font-size:14px;
}
.plan-meta + .plan-meta{ margin-top:6px; }

.plan .price{
  margin:12px 0 14px;
  gap:8px;
}
.plan .price .num{ font-size:38px; }
.plan .price .per{ font-size:14px; }

.plan-star{
  font-size:16px;
  vertical-align:middle;
}

.pricing-footnote{
  text-align:center;
  margin:18px 0 0;
  color: var(--muted);
  font-size:13px;
}

.plan{
  position:relative;
}
.plan.featured{
  border:2px solid color-mix(in oklab, var(--primary) 55%, var(--border));
  box-shadow: var(--shadow-sm);
}
.ribbon{
  position:absolute;
  top:-14px;
  left:20px;
  padding:6px 12px;
  border-radius:999px;
  color:#fff;
  font-weight:900;
  font-size:12px;
  background: linear-gradient(90deg, var(--hero-grad-1), var(--hero-grad-2), var(--hero-grad-3));
  box-shadow: 0 10px 18px rgba(37,99,235,.22);
}
.price{
  display:flex;
  align-items:baseline;
  gap:10px;
  margin:14px 0 18px;
}
.price .num{ font-size:42px; font-weight:950; letter-spacing:-.02em; }
.price .per{ color: var(--muted); }

/* FAQ */
.faq details{
  border:1px solid var(--border);
  border-radius:16px;
  padding:18px 18px;
  background: var(--card);
}
.faq details:hover{
  border-color: color-mix(in oklab, var(--primary) 35%, var(--border));
}
.faq summary{
  cursor:pointer;
  list-style:none;
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:12px;
  font-weight:900;
  font-size:18px;
}
.faq summary::-webkit-details-marker{ display:none; }
.faq p{
  margin:12px 0 0;
  color: var(--muted);
}

/* Footer */
.footer{
  border-top:1px solid var(--border);
  background: color-mix(in oklab, var(--muted-bg) 75%, transparent);
  padding:44px 0;
}
.footer-grid{
  display:grid;
  gap:22px;
}
@media (min-width: 768px){
  .footer-grid{ grid-template-columns: 2fr 1fr 1fr 1fr; gap:24px; }
}
.footer h4{
  margin:0 0 12px;
  font-size:14px;
  font-weight:900;
}
.footer ul{ list-style:none; padding:0; margin:0; display:flex; flex-direction:column; gap:10px; color: var(--muted); font-size:14px; }
.footer a:hover{ color: var(--fg); }
.footer-bottom{
  border-top:1px solid var(--border);
  margin-top:26px;
  padding-top:18px;
  display:flex;
  flex-direction:column;
  gap:12px;
  align-items:flex-start;
  color: var(--muted);
  font-size:14px;
}
@media (min-width: 768px){
  .footer-bottom{ flex-direction:row; justify-content:space-between; align-items:center; }
}
.footer-social{ display:flex; gap:18px; }

/* Legal page typography */
.prose{
  max-width: 860px;
}
.prose h1{ margin:0 0 18px; font-size:40px; letter-spacing:-.02em; }
.prose h2{ margin:32px 0 12px; font-size:24px; letter-spacing:-.01em; }
.prose h3{ margin:18px 0 10px; font-size:18px; }
.prose p{ margin:10px 0; color: var(--muted); }
.prose a{ color: var(--primary); text-decoration: underline; text-decoration-thickness: from-font; }
.prose ul{ color: var(--muted); }
.prose .divider{
  border-top:1px solid var(--border);
  margin-top:30px;
  padding-top:18px;
  font-size:13px;
  color: var(--muted);
}

/* 404 */
.notfound{
  min-height: 100vh;
  display:grid;
  place-items:center;
  padding:24px;
  background: linear-gradient(135deg,
    color-mix(in oklab, var(--muted-bg) 70%, transparent),
    color-mix(in oklab, var(--muted-bg) 90%, transparent));
}
.notfound-card{
  width:min(560px, 100%);
  border-radius: 20px;
  border:1px solid var(--border);
  background: color-mix(in oklab, var(--card) 86%, transparent);
  box-shadow: var(--shadow);
  padding:28px;
  text-align:center;
}
.pulse{
  position:relative;
  width:70px; height:70px;
  margin:0 auto 14px;
}
.pulse::before{
  content:'';
  position:absolute;
  inset:0;
  border-radius:999px;
  background: rgba(239,68,68,.16);
  animation:pulse 1.8s ease-in-out infinite;
}
@keyframes pulse{
  0%, 100%{ transform: scale(0.9); opacity: .8;}
  50%{ transform: scale(1.05); opacity: 1;}
}
.err{
  font-size:48px;
  font-weight:950;
  letter-spacing:-.03em;
  margin:0;
}
.suberr{
  margin:4px 0 10px;
  font-weight:900;
  color: color-mix(in oklab, var(--fg) 80%, var(--muted));
}
.small{
  margin:0 0 20px;
  color: var(--muted);
}

/* Simple inline svg sizing */
svg.icon{
  width:18px;
  height:18px;
}
svg.icon.lg{
  width:20px;
  height:20px;
}
svg.icon.xl{
  width:24px;
  height:24px;
}
svg.icon.brand{
  width:20px;
  height:20px;
}
CSS