:root{
  --ink:#0f1720;
  --muted:#5e6a75;
  --surface:#f7f8fa;
  --card:#ffffff;
  --accent:#c7f58f;
  --border:#e2e8f0;
  --warn:#810000;

  --h1:clamp(30px,4vw,36px);
  --h2:22px;
  --h3:18px;
  --body:16px;
  --label:13px;

  --space-lg:32px;
  --space-md:18px;
  --space-sm:10px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}

body{
  margin:0;
  background:
    radial-gradient(circle at 20% 20%, #f1f5ff, #f7f8fa 45%),
    radial-gradient(circle at 80% 10%, #eefbf0, #f7f8fa 40%),
    var(--surface);
  color:var(--ink);
  font-family:"Space Grotesk","IBM Plex Sans","Helvetica Neue",Arial,sans-serif;
  line-height:1.6;
  padding:56px 20px 72px;
}

.wrap{max-width:1000px;margin:0 auto}

header{
  display:flex;
  flex-direction:column;
  gap:var(--space-sm);
  margin-bottom:var(--space-lg);
}

.logo{
  width:clamp(236px,38vw,320px);
  height:auto;
  filter:drop-shadow(0 10px 30px rgba(15,23,32,.08));
  margin-bottom:8px;
}

h1,h2,h3{
  letter-spacing:-0.02em;
  color:var(--ink);
  margin:0 0 var(--space-sm);
  line-height:1.25;
}

h1{font-size:var(--h1)}
h2{font-size:var(--h2);color:var(--warn)}
h3{font-size:var(--h3)}

p{
  margin:0 0 var(--space-sm);
  color:var(--muted);
  font-size:var(--body);
}
p:last-child{margin-bottom:0}

.lead{max-width:68ch}

.principles{
  padding:14px 16px 16px;
  border-radius:12px;
  border:1px solid #f4dec8;
  background:#fff8f1;
  box-shadow:0 10px 22px rgba(15,23,32,.04);
}
.principles h3{margin-bottom:6px}

.hero-stack{display:grid;gap:var(--space-sm)}
.principles-wrap{display:grid;gap:var(--space-sm)}

.section{
  display:grid;
  gap:var(--space-md);
  margin-bottom:var(--space-lg);
}

.section-header{display:grid;gap:6px}
.section-header p{margin:0}

.grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:var(--space-md);
}

.card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:14px;
  padding:18px 18px 20px;
  box-shadow:0 15px 30px rgba(15,23,32,.05);
  display:grid;
  gap:10px;
}

.card-visual{
  width:100%;
  border-radius:10px;
  border:1px solid var(--border);
  display:block;
  object-fit:cover;
}

.form-card{
  background:var(--card);
  border:1px solid var(--border);
  border-radius:14px;
  padding:18px 18px 20px;
  box-shadow:0 12px 28px rgba(15,23,32,.05);
}

.demo-form{
  display:grid;
  gap:var(--space-sm);
}

.demo-form .row{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:var(--space-sm);
}
@media (max-width:740px){
  .demo-form .row{grid-template-columns:1fr}
}

label{
  display:block;
  font-size:var(--label);
  color:var(--muted);
  margin:0 0 6px;
}

input[type="text"],
input[type="tel"],
input[type="password"],
select,
textarea{
  width:100%;
  padding:12px 14px;
  border:1px solid var(--border);
  border-radius:10px;
  background:#fff;
  font-size:var(--body);
  color:var(--ink);
  transition:border-color 120ms ease, box-shadow 120ms ease;
}

textarea{resize:vertical;min-height:120px}

input:focus,select:focus,textarea:focus{
  outline:none;
  border-color:#a6dfa1;
  box-shadow:0 0 0 3px rgba(166,223,161,.35);
}

button{
  justify-self:start;
  padding:12px 16px;
  border:none;
  border-radius:12px;
  background:var(--ink);
  color:#fff;
  font-weight:700;
  font-size:var(--body);
  cursor:pointer;
  transition:transform 120ms ease, box-shadow 120ms ease, opacity 120ms ease;
  box-shadow:0 10px 22px rgba(15,23,32,.15);
}

button:hover{
  transform:translateY(-1px);
  box-shadow:0 12px 26px rgba(15,23,32,.18);
}
button:active{
  transform:translateY(0);
  box-shadow:0 8px 18px rgba(15,23,32,.14);
}
button:disabled{opacity:.45;cursor:not-allowed}

.output{
  margin-top:var(--space-sm);
  padding:14px 14px;
  border-radius:12px;
  border:1px solid var(--border);
  background:#fff;
  color:var(--ink);
  box-shadow:0 10px 18px rgba(15,23,32,.06);
  white-space:pre-wrap;
  min-height:56px;
}

.badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 14px;
  border-radius:999px;
  background:var(--ink);
  color:#fff;
  font-weight:700;
  font-size:var(--label);
  text-decoration:none;
  box-shadow:0 12px 26px rgba(15,23,32,.2);
  letter-spacing:.02em;
}

.hint{
  margin-top:6px;
  font-size:var(--label);
  color:var(--muted);
}

.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;
}

.req-star{ color:#c00000; font-weight:800; }
.req-note{ margin-top:6px; }
.form-footer{
  margin-top:10px;
  padding-top:10px;
  border-top:1px solid var(--border);
  color:var(--muted);
  font-size:13px;
}
.footer-line{ margin-top:4px; }
.output-label{
  display:block;
  margin-top:14px;
  margin-bottom:6px;
  font-size:13px;
  color:var(--muted);
}