:root {
  --navy: #111820;
  --panel: #18222d;
  --line: #263341;
  --text: #f2f4f6;
  --muted: #9aa7b4;
  --amber: #e8a80c;
  --radius: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--navy);
  color: var(--text);
  font-family: "Cairo", system-ui, sans-serif;
  line-height: 1.7;
}

.mono { font-family: "JetBrains Mono", ui-monospace, monospace; }
.accent { color: var(--amber); }

.top, main, footer { max-width: 960px; margin: 0 auto; padding: 0 16px; }

.top {
  display: flex; align-items: center; gap: 16px;
  padding-top: 28px; padding-bottom: 12px;
}
.logo { width: 64px; height: 64px; border-radius: 14px; flex: none; }
.logo.sm { width: 28px; height: 28px; border-radius: 7px; }
h1 { margin: 0; font-size: clamp(1.6rem, 5vw, 2.4rem); font-weight: 800; line-height: 1.3; }
.sub { margin: 4px 0 0; color: var(--muted); }
h2 { margin: 0 0 12px; font-size: 1.15rem; }

.drop {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  margin-top: 16px; padding: 40px 16px;
  border: 2px dashed var(--line); border-radius: var(--radius);
  background: var(--panel); cursor: pointer; text-align: center;
  transition: border-color .2s, background .2s;
}
.drop:hover, .drop.over { border-color: var(--amber); background: #1d2935; }
.drop-icon { font-size: 2.4rem; font-weight: 800; color: var(--amber); letter-spacing: 4px; }
.drop small { color: var(--muted); }
.drop.compact { padding: 14px; flex-direction: row; justify-content: center; }
.drop.compact .drop-icon, .drop.compact small { display: none; }

.privacy { color: var(--muted); font-size: .9rem; margin: 8px 0 20px; text-align: center; }

#work { display: grid; gap: 16px; }
#work[hidden] { display: none; }

.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px;
}

.preview-card canvas, .zoom-card canvas {
  display: block; width: 100%; height: auto;
  background: #fff; border-radius: 10px;
}
.preview-card canvas { cursor: zoom-in; touch-action: manipulation; }
.hint, .legend { margin: 10px 0 0; color: var(--muted); font-size: .9rem; text-align: center; }
.legend .one { color: #fff; font-weight: 800; }
.legend .zero { color: var(--muted); }

.controls { display: grid; gap: 14px; }
.control label, .control .label { display: block; font-weight: 600; margin-bottom: 4px; }
.control output { color: var(--amber); font-family: "JetBrains Mono", monospace; }
input[type=range] { width: 100%; accent-color: var(--amber); }

.seg { display: flex; gap: 6px; flex-wrap: wrap; }
.seg button {
  flex: 1 1 160px; padding: 10px; border-radius: 10px;
  border: 1px solid var(--line); background: transparent; color: var(--text);
  font: inherit; cursor: pointer;
}
.seg button.on { background: var(--amber); border-color: var(--amber); color: var(--navy); font-weight: 800; }

.row { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.check { display: flex; align-items: center; gap: 6px; cursor: pointer; }
.check input { accent-color: var(--amber); width: 18px; height: 18px; }
.link { background: none; border: none; color: var(--amber); font: inherit; cursor: pointer; padding: 0; text-decoration: underline; }

.btns { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; }
.btn {
  padding: 14px; border-radius: 12px; border: 1px solid var(--line);
  background: #202c39; color: var(--text); font: inherit; font-weight: 600; cursor: pointer;
}
.btn:hover { border-color: var(--amber); }
.btn.primary { background: var(--amber); color: var(--navy); border-color: var(--amber); font-weight: 800; }
.btn:disabled { opacity: .6; cursor: wait; }
.status { min-height: 1.7em; margin: 10px 0 0; color: var(--muted); font-size: .9rem; }

.how { margin: 16px 0 24px; }
.how ol { margin: 0; padding-inline-start: 22px; }
.how .note { color: var(--muted); font-size: .9rem; margin-bottom: 0; }

footer {
  display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 10px;
  padding-top: 8px; padding-bottom: 32px; color: var(--muted); font-size: .9rem;
}
footer a { color: var(--amber); }

html { -webkit-text-size-adjust: 100%; }
img, canvas { max-width: 100%; }
.top > div { min-width: 0; }
input[type=range] { height: 28px; }

/* Phones */
@media (max-width: 520px) {
  .top { padding-top: 18px; gap: 12px; }
  .logo { width: 48px; height: 48px; border-radius: 11px; }
  .sub { font-size: .92rem; }
  .drop { padding: 28px 14px; }
  .card { padding: 12px; }
  .btns { grid-template-columns: 1fr; }
  .btn { padding: 13px; }
  .seg button { flex-basis: 100%; }
  .row { gap: 12px 18px; }
  footer { flex-direction: column; text-align: center; gap: 6px; }
}

/* Tablets (portrait): single column, but controls and downloads side by side */
@media (min-width: 600px) and (max-width: 859px) {
  #work { grid-template-columns: 1fr 1fr; }
  .preview-card, .zoom-card, .downloads { grid-column: 1 / -1; }
  .btns { grid-template-columns: 1fr 1fr; }
  .controls { grid-column: 1 / -1; grid-template-columns: 1fr 1fr; column-gap: 24px; }
  .controls .row { grid-column: 1 / -1; }
}

/* Tablet landscape / desktop */
@media (min-width: 860px) {
  #work { grid-template-columns: 1.5fr 1fr; align-items: start; }
  .preview-card { grid-row: span 3; }
  .downloads { grid-column: 1 / -1; }
  .btns { grid-template-columns: repeat(4, 1fr); }
}