:root {
  color-scheme: dark;
  --bg: #121417;
  --panel: #1b1f24;
  --panel-border: #343b45;
  --text: #eef2f6;
  --muted: #9aa7b4;
  --accent: #34d399;
  --accent-strong: #10b981;
  --danger: #f87171;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
}

button, input { font: inherit; }

.shell {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: 34px; }
h2 { margin-bottom: 0; font-size: 20px; }

.runtime-pill {
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 8px 12px;
  color: var(--accent);
  background: #15191e;
  min-width: 120px;
  text-align: center;
}

.panel {
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  background: var(--panel);
  padding: 20px;
  margin-bottom: 18px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.panel-head p { margin: 4px 0 0; color: var(--muted); word-break: break-all; }
.upload-form { display: grid; grid-template-columns: 1fr auto; gap: 12px; }

input[type='file'] {
  width: 100%;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 10px;
  background: #111418;
  color: var(--text);
}

button {
  border: 0;
  border-radius: 6px;
  padding: 10px 14px;
  background: var(--accent-strong);
  color: #04130d;
  font-weight: 700;
  cursor: pointer;
}

button:hover { background: var(--accent); }

.result-box {
  margin: 16px 0 0;
  min-height: 96px;
  overflow: auto;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 12px;
  background: #101317;
  color: var(--muted);
  white-space: pre-wrap;
}

.file-list { display: grid; gap: 10px; }
.file-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 12px;
  background: #14181d;
}
.file-row strong { display: block; overflow-wrap: anywhere; }
.file-row span { color: var(--muted); font-size: 13px; }
.file-row a { color: var(--accent); text-decoration: none; font-weight: 700; }
.empty { color: var(--muted); }
.error { color: var(--danger); }

@media (max-width: 720px) {
  .topbar, .panel-head, .upload-form, .file-row {
    grid-template-columns: 1fr;
    display: grid;
    align-items: stretch;
  }
}