:root {
  --paper: #fcfcfa;
  --ink: #15151b;
  --accent: #4f46e5;
  --line: #e4e4e7;
  --mute: #71717a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  background-image:
    radial-gradient(circle at 20% 10%, rgba(79, 70, 229, .08), transparent 30%),
    radial-gradient(circle at 90% 5%, rgba(14, 165, 233, .08), transparent 30%);
}

.shell { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

header { border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, .8); backdrop-filter: blur(8px); }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 16px; }
h1 { font-size: 20px; margin: 0; letter-spacing: -.02em; }
h2 { font-size: 18px; margin: 0; letter-spacing: -.01em; }

a { color: var(--accent); text-decoration: none; font-size: 14px; }
a:hover { text-decoration: underline; }

main { padding-block: 28px 48px; display: grid; gap: 20px; }

.panel {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .05);
}

.controls { display: flex; flex-wrap: wrap; gap: 18px; align-items: flex-end; }
.controls label { display: grid; gap: 6px; font-size: 13px; color: var(--mute); }
.controls label.check { flex-direction: row; display: flex; align-items: center; gap: 8px; }

select {
  font: inherit;
  font-size: 14px;
  color: var(--ink);
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
}

.status { margin: 0 0 0 auto; font-size: 13px; color: var(--mute); }
.status.err { color: #be123c; }
.status.ok { color: #047857; }

.head { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.meta { margin: 4px 0 0; font-size: 13px; color: var(--mute); }
.actions { display: flex; gap: 8px; }

button {
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  background: var(--accent);
  border: 0;
  border-radius: 10px;
  padding: 10px 16px;
  cursor: pointer;
  transition: opacity .15s, background .15s;
}
button:hover { background: #4338ca; }
button:disabled { opacity: .5; cursor: progress; }
button.ghost { background: transparent; color: var(--accent); border: 1px solid var(--line); }
button.ghost:hover { background: #eef2ff; }

.stage {
  border-radius: 14px;
  padding: 24px;
  display: grid;
  place-items: center;
  transition: background .2s;
}
.stage[data-bg="dark"] { background: #101014; }
.stage[data-bg="light"] { background: #ededed; }
.stage svg { width: 100%; height: auto; max-width: 100%; }

.specs ul { margin: 14px 0 0; padding-left: 20px; display: grid; gap: 8px; font-size: 14px; line-height: 1.5; }

footer { border-top: 1px solid var(--line); padding-block: 20px; font-size: 13px; color: var(--mute); }