/* ========= Brand ========= */
:root{
  --brand:#38A45F;
  --bg:#F2F4F6;
  --ink:#1F2A2E;
  --muted:#6B7A85;
  --card:#FFFFFF;

  /* shadows */
  --shadow: 0 10px 24px rgba(0,0,0,.14);
  --shadow-soft: 0 2px 8px rgba(0,0,0,.08);

  /* checkerboard */
  --checker-a:#f1f1f1;
  --checker-b:#e7e7e7;
}

/* ========= Euclid font (webfonts in /fonts) ========= */
@font-face{
  font-family:"Euclid";
  src:url("./fonts/euclidcirculara-regular-webfont.woff2") format("woff2");
  font-weight:400; font-style:normal; font-display:swap;
}
@font-face{
  font-family:"Euclid";
  src:url("./fonts/euclidcirculara-semibold-webfont.woff2") format("woff2");
  font-weight:600; font-style:normal; font-display:swap;
}
@font-face{
  font-family:"Euclid";
  src:url("./fonts/euclidcirculara-light-webfont.woff2") format("woff2");
  font-weight:300; font-style:normal; font-display:swap;
}

/* ========= Base ========= */
html,body{height:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font:16px/1.5 "Euclid", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ========= Layout ========= */
.wrap{max-width:880px;margin:48px auto 80px;padding:0 24px}

.card{
  max-width: 470px;
  margin: 0 auto;
  background:var(--card);
  border-radius:18px;
  padding-top:28px;   /* only top padding */
  box-shadow: var(--shadow), var(--shadow-soft);
}

.card-copy{
  padding: 0 28px;    /* side padding for text */
  margin-bottom: 18px;
}

.card-copy h1{
  margin:0 0 8px;
  font-size:34px; line-height:1.2; font-weight:400;
  color:var(--brand);
}
.card-copy p{
  margin:0;
  color:#51616B;
  font-size:18px;
  padding-top:6px;
}

/* ========= Preview (470×200 | TL 0, TR 40, BR 12, BL 12) ========= */
.preview{
  position:relative;
  width:470px; height:200px;
  margin:0;   /* flush inside card */
  border-radius:0 40px 12px 12px;
  overflow:hidden;
  background:
    linear-gradient(45deg,var(--checker-a) 25%,transparent 25%) 0 0/24px 24px,
    linear-gradient(45deg,transparent 75%,var(--checker-a) 75%) 0 0/24px 24px,
    linear-gradient(45deg,var(--checker-a) 25%,transparent 25%) 12px 12px/24px 24px,
    linear-gradient(45deg,transparent 75%,var(--checker-a) 75%) 12px 12px/24px 24px,
    var(--checker-b);
  box-shadow: var(--shadow-soft);
}
canvas{
  display:block;
  max-width:100%;
  height:auto;
  border-radius:0;
  touch-action:none;
}

/* ========= Upload hint ========= */
.empty-hint{
  position:absolute; inset:0;
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:12px;
  font:400 18px/1.6 "Euclid", system-ui, sans-serif;
  color:var(--muted);
  background:rgba(255,255,255,.72);
  border:none;
  border-radius:0 40px 12px 12px;
  cursor:pointer;
  transition:background .2s, box-shadow .2s, opacity .2s;
}
.empty-hint:hover{ background:rgba(255,255,255,.88); }
.empty-hint:focus-visible{ outline:3px solid rgba(56,164,95,.35); outline-offset:3px; }
.empty-hint img{ width:42px; height:42px; }

/* dashed outline */
.hint-border{
  position:absolute; inset:0;
  width:100%; height:100%;
  pointer-events:none;
}
.hint-border path{
  stroke:var(--brand);
  stroke-width:2;
  stroke-dasharray:6 6;
  stroke-linecap:round;
  stroke-linejoin:round;
  vector-effect:non-scaling-stroke;
  shape-rendering:geometricPrecision;
  fill:none;
}

/* ========= Controls ========= */
.controls{margin-top:28px}

.slider-card{
  max-width:440px;
  margin:0 auto;
  background:var(--card);
  border:1px solid #E2E7EB;
  border-radius:14px;
  padding:14px 16px 18px;
  box-shadow: var(--shadow-soft);
}
.slider-title{
  float:right;
  font:400 13px/1 "Euclid", system-ui, sans-serif;
  color:var(--muted);
  margin-bottom:10px;
}

/* slider track */
input[type="range"]{
  -webkit-appearance:none; appearance:none;
  width:100%; height:20px; background:transparent; outline:none;
}
input[type="range"]::-webkit-slider-runnable-track{
  height:8px; border-radius:999px;
  background:
    linear-gradient(var(--brand), var(--brand)) 0/ var(--fill, 0%) 100% no-repeat,
    #DADFE3;
  border:none;
}
input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none; appearance:none;
  width:28px; height:28px; margin-top:-13px;
  border-radius:50%;
  background:var(--brand);
  box-shadow:0 2px 6px rgba(56,164,95,.35);
  border:0; transition:transform .1s ease;
}
input[type="range"]:active::-webkit-slider-thumb{ transform:scale(1.06); }

/* Firefox */
input[type="range"]::-moz-range-track{
  height:8px; border-radius:999px; background:#DADFE3; border:none;
}
input[type="range"]::-moz-range-progress{
  height:8px; border-radius:999px; background:var(--brand);
}
input[type="range"]::-moz-range-thumb{
  width:28px; height:28px; border-radius:50%;
  background:var(--brand); border:0; box-shadow:0 2px 6px rgba(56,164,95,.35);
  transition:transform .1s ease;
}
input[type="range"]:active::-moz-range-thumb{ transform:scale(1.06); }

/* ========= Buttons ========= */
.buttons{
  display:flex; gap:18px; flex-wrap:wrap; justify-content:center; margin-top:16px;
}
.btn{
  font:500 18px/1 "Euclid", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  padding:18px 22px; border-radius:999px; cursor:pointer; user-select:none;
  display:inline-flex; align-items:center; gap:10px;
  transition: transform .06s ease, box-shadow .2s ease, background-color .2s ease, color .2s ease, border-color .2s ease;
}
.btn-outline{
  background:#fff; color:var(--brand);
  border:2px solid var(--brand);
  box-shadow: var(--shadow-soft);
}
.btn-outline:hover{ transform:translateY(-1px); box-shadow:0 8px 18px rgba(0,0,0,.08); }
.btn-outline:active{ transform:translateY(0); box-shadow:none; }
.btn:focus-visible{ outline:3px solid rgba(56,164,95,.35); outline-offset:3px; }

/* button icons */
.btn img{ width:22px; height:22px; }

/* ========= A11y ========= */
.visually-hidden{
  position:absolute !important;
  left:-9999px !important;
  width:1px !important; height:1px !important;
  overflow:hidden !important;
}