/* MainframeMint — 3270 terminal aesthetic */
:root {
  --bg: #060906;
  --panel: #0a120b;
  --panel-edge: #1d3a22;
  --green: #3dff7c;
  --green-dim: #23884a;
  --amber: #ffc46b;
  --red: #ff6b6b;
  --text: #c9e5cf;
  --text-dim: #6f8f77;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.5;
}
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(0,0,0,.16) 0 1px, transparent 1px 3px);
  z-index: 9;
}

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--panel-edge);
}
.brand-mark { color: var(--green); letter-spacing: 2px; }
.brand-name { letter-spacing: 1px; }
.brand-name b { color: var(--green); }
.top-controls select {
  margin-left: 8px;
  background: var(--panel); color: var(--text);
  border: 1px solid var(--panel-edge); border-radius: 4px;
  font-family: var(--mono); padding: 4px 6px;
}

main { max-width: 720px; margin: 0 auto; padding: 16px; }

.hero h1 { color: var(--green); font-size: 26px; margin: 18px 0 8px; }
.hero-sub { color: var(--text-dim); margin: 0 0 14px; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.chip {
  border: 1px solid var(--panel-edge); border-radius: 999px;
  padding: 2px 10px; font-size: 12px; color: var(--text-dim);
}
.chip-green { color: var(--green); border-color: var(--green-dim); }

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  box-shadow: inset 0 0 0 1px rgba(61,255,124,.05), 0 0 24px rgba(0,0,0,.5);
  border-radius: 6px;
  padding: 16px;
  margin-bottom: 16px;
}
.panel-title {
  margin: -16px -16px 12px;
  padding: 6px 16px;
  border-bottom: 1px solid var(--panel-edge);
  color: var(--green); font-size: 13px; letter-spacing: 2px;
}

.tabs { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.tab {
  flex: 1 1 auto;
  background: transparent; color: var(--text-dim);
  border: 1px solid var(--panel-edge); border-radius: 4px;
  font-family: var(--mono); padding: 8px 10px; cursor: pointer;
}
.tab.active { color: var(--bg); background: var(--green); border-color: var(--green); font-weight: 700; }

#form { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field span { display: block; font-size: 12px; color: var(--text-dim); margin-bottom: 4px; }
.field input {
  width: 100%;
  background: var(--bg); color: var(--green);
  border: 1px solid var(--panel-edge); border-radius: 4px;
  font-family: var(--mono); font-size: 16px; padding: 8px 10px;
}
.field input:focus { outline: 1px solid var(--green-dim); }
.run {
  grid-column: 1 / -1;
  background: var(--green); color: #04140a; font-weight: 700;
  border: 0; border-radius: 4px;
  font-family: var(--mono); font-size: 15px; letter-spacing: 1px;
  padding: 11px; cursor: pointer;
}
.run:hover { filter: brightness(1.08); }
.run:disabled { opacity: .55; cursor: wait; }

.err { color: var(--red); font-size: 13px; margin: 10px 0 0; }
.hidden { display: none !important; }

.result-row {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 8px 0; border-bottom: 1px dashed var(--panel-edge);
}
.result-row:last-child { border-bottom: 0; }
.result-key { color: var(--text-dim); font-size: 13px; }
.result-val { color: var(--green); font-weight: 700; white-space: nowrap; }
.result-note { color: var(--amber); font-size: 12px; }

.log {
  min-height: 88px; max-height: 220px; overflow-y: auto;
  margin: 0; font-size: 12.5px; color: var(--green-dim); white-space: pre-wrap;
}
.log .l-in { color: var(--text); }
.log .l-ok { color: var(--green); }
.log .l-bad { color: var(--red); }

.history { display: grid; gap: 8px; margin-bottom: 10px; }
.hist-item {
  display: flex; justify-content: space-between; gap: 8px;
  border: 1px solid var(--panel-edge); border-radius: 4px; padding: 6px 10px;
  font-size: 12.5px; cursor: pointer;
}
.hist-item:hover { border-color: var(--green-dim); }
.hist-pgm { color: var(--amber); }
.ghost {
  background: transparent; color: var(--text-dim);
  border: 1px solid var(--panel-edge); border-radius: 4px;
  font-family: var(--mono); padding: 6px 12px; cursor: pointer;
}

.about h2 { color: var(--green); font-size: 17px; }
.about p { color: var(--text-dim); }
.srclink { color: var(--green); }

footer {
  max-width: 720px; margin: 0 auto; padding: 18px 16px 28px;
  display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap;
  color: var(--text-dim); font-size: 12px;
  border-top: 1px solid var(--panel-edge);
}

@media (max-width: 480px) {
  #form { grid-template-columns: 1fr; }
  .hero h1 { font-size: 21px; }
}