:root{
  --bg: #0f1226;
  --card: #151726;
  --muted: #9aa0a6;
  --accent1: #8fb9a8; /* soft green */
  --accent2: #b08ea6; /* soft rose */
  --accent3: #c9d6e3; /* light highlight */
  --danger: #e07373;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: linear-gradient(180deg, var(--bg), #0b0d16);
  color: var(--accent3);
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px;
}
.card{
  width:100%;
  max-width:780px;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border:1px solid rgba(255,255,255,0.03);
  border-radius:12px;
  padding:28px;
  /* Enforce a 4:3 aspect ratio layout (responsive) */
  aspect-ratio: 4 / 3;
  width: min(90vw, 780px);
  box-shadow: 0 6px 30px rgba(2,6,23,0.6);
}

.card-head{margin-bottom:12px}
.grid{
  display:grid;
  grid-template-columns: 1fr 340px;
  gap:16px;
  align-items:start;
}
.col-left{}
.col-right{min-width:220px}
.panel{
  background: linear-gradient(180deg, rgba(255,255,255,0.01), transparent);
  border:1px solid rgba(255,255,255,0.02);
  padding:12px;
  border-radius:8px;
  margin-bottom:12px;
}
.preview{height:100%}
.preview-canvas{
  height:140px;
  border-radius:8px;
  border:1px dashed rgba(255,255,255,0.03);
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--muted);
  font-size:13px;
  padding:8px;
  background:linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.00));
}
.preview-placeholder{opacity:0.9; text-align:center}

@media (max-width:880px){
  .grid{grid-template-columns: 1fr; aspect-ratio: auto}
  .card{aspect-ratio: auto}
}
h1{
  margin:0 0 8px 0;
  font-size:20px;
  color:var(--accent3);
}
.muted{color:var(--muted); font-size:13px}
.file-drop{
  display:block;
  margin-top:18px;
  padding:18px;
  border-radius:10px;
  border:1px dashed rgba(255,255,255,0.04);
  background: linear-gradient(180deg, rgba(255,255,255,0.01), transparent);
  cursor:pointer;
}
.file-drop-inner{display:flex;flex-direction:column;gap:8px}
.file-drop.dragover{border-color:rgba(143,185,168,0.8); background: rgba(143,185,168,0.02)}
input[type="file"]{display:none}
.actions{margin-top:16px; display:flex; gap:8px; align-items:center}
.btn{
  padding:10px 14px;
  background: linear-gradient(180deg,var(--accent1), #6fa189);
  border:none;
  color:#061014;
  font-weight:600;
  border-radius:8px;
  cursor:pointer;
}
.btn:active{transform:translateY(1px)}
.progress-wrap{margin-top:14px; background:#0b0e19; padding:8px; border-radius:8px; border:1px solid rgba(255,255,255,0.02)}
.progress-bar{height:10px; background:linear-gradient(90deg,var(--accent2),var(--accent1)); width:0%; border-radius:6px; transition:width .2s ease}
.progress-text{margin-top:6px; font-size:13px; color:var(--muted)}
.hidden{display:none}
.result{margin-top:16px}
.download-link{
  display:inline-block;
  padding:8px 12px;
  background:linear-gradient(180deg,var(--accent2), #9b6f88);
  color:#071016;
  border-radius:8px;
  text-decoration:none;
  font-weight:700;
}
.small{font-size:13px; color:var(--muted); margin-top:8px}
.error{color:var(--danger); background:rgba(224,115,115,0.06); padding:8px; border-radius:8px}
.foot{margin-top:18px; font-size:13px}
.download-link:hover{filter:brightness(1.02)}


/* Toast notification */
.toast{
  position: fixed;
  left: 50%;
  bottom: 30px;
  transform: translateX(-50%) translateY(10px);
  background: rgba(15,18,38,0.9);
  color: var(--accent3);
  padding: 10px 14px;
  border-radius: 10px;
  box-shadow: 0 8px 30px rgba(2,6,23,0.6);
  border:1px solid rgba(255,255,255,0.03);
  max-width: 90%;
  text-align:center;
  font-weight:600;
  z-index: 1200;
  opacity: 0;
  transition: transform 280ms cubic-bezier(.2,.9,.3,1), opacity 220ms ease;
}
.toast.visible{
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}
.toast.hidden{display:block; opacity:0; pointer-events:none}