:root{
  --brand:#14406e;
  --brand-dark:#0d2c4e;
  --brand2:#e08a2e;
  --ink:#1c2430;
  --muted:#5b6b7d;
  --bg:#f4f7fa;
  --surface:#ffffff;
  --surface2:#eef3f8;
  --line:rgba(20,64,110,.25);
  --line-soft:rgba(20,64,110,.12);
  --radius:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text","Segoe UI",Inter,Roboto,"Helvetica Neue",Arial,sans-serif;
  font-size:1.05rem;
  line-height:1.6;
}
.wrap{max-width:1080px;margin:0 auto;padding:0 1.25rem}
a{color:var(--brand-dark)}
[hidden]{display:none!important}

/* header */
.topbar{background:var(--brand);color:#fff}
.topbar-in{display:flex;justify-content:space-between;align-items:center;padding:.9rem 1.25rem}
.brandmark{font-weight:750;font-size:1.25rem;letter-spacing:-.02em}
.brandmark span{color:#f3c98a}
.toplink{color:#fff;text-decoration:none;font-size:.92rem;opacity:.92}
.toplink:hover{text-decoration:underline;opacity:1}

/* hero */
.hero{padding:2.6rem 0 1.4rem}
.hero h1{
  font-size:clamp(2rem,4.6vw,3.1rem);
  line-height:1.12;
  letter-spacing:-.03em;
  font-weight:750;
  margin:0 0 1rem;
  text-wrap:balance;
}
.lede{font-size:1.14rem;max-width:48rem;text-wrap:pretty;margin:0}
.privacy-line{
  margin:1rem 0 0;max-width:48rem;font-size:.98rem;font-weight:650;
  border-left:4px solid var(--brand2);padding:.2rem 0 .2rem .8rem;text-wrap:pretty;
}
.note-line{color:var(--muted);font-size:.98rem;margin:.8rem 0 0;max-width:48rem;text-wrap:pretty}

/* cards */
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:1.6rem clamp(1.1rem,3vw,2rem);
  margin:1.4rem 0;
  box-shadow:0 1px 2px rgba(20,64,110,.05),0 8px 24px rgba(20,64,110,.06);
}
.card h2{font-size:clamp(1.3rem,2.4vw,1.6rem);letter-spacing:-.02em;margin:.2rem 0 .6rem;text-wrap:balance}
.hint{color:var(--muted);font-size:.94rem;margin:1rem 0 0;text-wrap:pretty}
.calc-row{margin-top:1.2rem;display:flex;gap:.6rem;flex-wrap:wrap}

/* buttons */
.btn{
  appearance:none;font:inherit;font-size:.95rem;font-weight:650;cursor:pointer;
  padding:.6rem 1.15rem;border-radius:999px;border:1px solid var(--brand);
  background:#fff;color:var(--brand-dark);
}
.btn:hover{background:color-mix(in srgb,var(--brand) 7%,#fff)}
.btn.primary{background:var(--brand);color:#fff}
.btn.primary:hover{background:var(--brand-dark)}
.btn:disabled{opacity:.55;cursor:wait}
.btn.big{font-size:1.05rem;padding:.8rem 1.5rem}

/* 3D stage: square, canvas fills it. The checkerboard sits behind the
   canvas so a transparent background reads as transparent. */
.stage-row{display:flex;gap:1.1rem;align-items:flex-start}
.stage-wrap{flex:1 1 auto;min-width:0;max-width:640px;margin:0 auto}
#stage{
  position:relative;width:100%;aspect-ratio:1/1;display:block;border-radius:10px;
  border:1px solid var(--line);overflow:hidden;
  background:#fdfdfd repeating-conic-gradient(#e4e4e4 0 25%, #f4f4f4 0 50%) 0 0/24px 24px;
}
#stage canvas{display:block;width:100%;height:100%}
#stage.dragging{outline:3px dashed var(--brand2);outline-offset:-6px}
.preview-note{color:var(--muted);font-size:.9rem;margin:.5rem 0 0;text-align:center}
.preview-note.err{color:#b91c1c;font-weight:650}

/* progress */
.progress-wrap{margin-top:1rem;max-width:520px}
.progress-track{height:10px;border-radius:999px;background:var(--surface2);border:1px solid var(--line-soft);overflow:hidden}
.progress-bar{height:100%;width:0%;background:var(--brand);border-radius:999px;transition:width .15s ease}
.progress-label{color:var(--muted);font-size:.9rem;margin:.4rem 0 0}

/* controls */
.controls{margin-top:1.5rem}
.ctl-section{border-top:1px solid var(--line-soft);padding:1.2rem 0 .4rem}
.ctl-section:first-child{border-top:0;padding-top:.2rem}
.ctl-title{font-size:1.08rem;margin:0 0 .8rem;letter-spacing:-.01em}
.row-wrap{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center;margin:.6rem 0}
.field{margin:0 0 1rem}
.field-label{display:block;font-weight:700;font-size:1rem;margin-bottom:.45rem}
.field-label .val{color:var(--brand-dark);font-weight:700}
.field-note{color:var(--muted);font-size:.88rem;margin:.35rem 0 0;text-wrap:pretty}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:0 1.4rem}
input[type=range]{width:100%;accent-color:var(--brand);height:2rem}
.seg{display:inline-flex;border:1px solid var(--brand);border-radius:999px;overflow:hidden;flex-wrap:wrap}
.seg-btn{
  appearance:none;font:inherit;font-weight:650;cursor:pointer;border:0;
  padding:.55rem 1.15rem;background:#fff;color:var(--brand-dark);
}
.seg-btn.selected{background:var(--brand);color:#fff}
.toggle{font-size:.97rem;cursor:pointer;display:flex;align-items:center;gap:.45rem}
.toggle input{accent-color:var(--brand);width:1.1rem;height:1.1rem}
.preview-toggle{margin-top:.8rem}

/* how it works */
.myth-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-top:.6rem}
.myth{border:1px solid var(--line-soft);border-radius:10px;background:var(--surface2);padding:.9rem 1rem}
.myth h3{font-size:1rem;margin:0 0 .4rem}
.myth p{margin:0;font-size:.93rem;color:var(--ink);text-wrap:pretty}

/* footer */
footer{border-top:1px solid var(--line);margin-top:2rem}
.foot-in{padding:1.4rem 1.25rem 2rem;color:var(--muted);font-size:.92rem}

/* email gate modal (PicConvert pattern) */
.pc-modal-backdrop{
  position:fixed;inset:0;background:rgba(8,24,44,.55);z-index:100;
  display:flex;align-items:center;justify-content:center;padding:1rem;
}
.pc-modal-backdrop[hidden]{display:none}
.pc-modal{
  background:var(--surface);color:var(--ink);border-radius:16px;max-width:430px;width:100%;
  padding:1.7rem 1.6rem 1.4rem;position:relative;box-shadow:0 24px 60px rgba(0,0,0,.3);
}
.pc-modal h2{margin:0 2rem .6rem 0;font-size:1.35rem;letter-spacing:-.02em}
.pc-modal p{margin:0 0 1rem;font-size:.98rem}
.pc-modal-close{
  position:absolute;top:.6rem;right:.8rem;border:0;background:transparent;
  font-size:1.6rem;line-height:1;cursor:pointer;color:var(--muted);
}
.pc-modal form{display:flex;gap:.55rem;flex-wrap:wrap}
.pc-modal input[type=email]{
  flex:1 1 200px;font:inherit;font-size:1rem;padding:.62rem .8rem;
  border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--ink);
}
.pc-modal-msg{font-size:.92rem;margin:.7rem 0 0;min-height:1.2em}
.pc-modal-msg.err{color:#b91c1c}
.pc-modal-msg.ok{color:#15803d}
.pc-modal-note{color:var(--muted);font-size:.85rem;margin:.8rem 0 0}

@media (max-width:860px){
  .myth-grid{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
}
@media (max-width:560px){
  .card{padding:1.2rem 1rem}
  .seg-btn{padding:.5rem .85rem}
}

@media (prefers-color-scheme: dark){
  :root{
    --ink:#eef3f8;--muted:#a9bccd;--bg:#0a1420;--surface:#122233;--surface2:#1a2f47;
    --line:rgba(224,138,46,.25);--line-soft:rgba(224,138,46,.12);
  }
  .btn{background:transparent;color:#bcd6f5}
  .btn:hover{background:color-mix(in srgb,var(--brand2) 14%,transparent)}
  .btn.primary{background:var(--brand);color:#fff}
  a{color:#bcd6f5}
  .field-label .val{color:#f3c98a}
  .pc-modal input[type=email]{background:#1a2f47;color:var(--ink)}
}