:root {
  --bg: #070b09;
  --ink: #d7ffe0;
  --muted: #6f9a78;
  --line: rgba(64, 255, 94, 0.28);
  --accent: #40ff5e;
}

.lock-gate {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(5, 8, 5, 0.96);
}

.lock-gate.is-gone,
.lock-gate[hidden] {
  display: none !important;
}

.lock-box {
  width: min(360px, 90vw);
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: stretch;
}

.lock-box .logo {
  height: 72px;
  width: auto;
  align-self: flex-start;
}

.lock-box p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.lock-box input {
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #050805;
  color: var(--ink);
}

.lock-box button {
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.lock-err {
  color: #ff7a7a !important;
  min-height: 1em;
}

.thr-num.pair {
  width: 110px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: linear-gradient(165deg, #050805, #0c1410 55%, #070b09);
}

.wrap {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 20px 40px;
}

.head {
  margin: 0 0 20px;
}

.head .logo {
  display: block;
  height: 72px;
  width: auto;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 16px;
}

.upload,
button,
.thr {
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: transparent;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.upload { cursor: pointer; }
.upload input { display: none; }

button { cursor: pointer; }
button:disabled { opacity: 0.35; cursor: not-allowed; }
button:not(:disabled):hover { border-color: var(--accent); color: var(--accent); }

.thr { color: var(--muted); }
.thr input[type="range"] { width: 120px; accent-color: var(--accent); }
.thr select {
  min-height: 28px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: #050805;
  color: var(--ink);
}
.thr.check { cursor: pointer; gap: 6px; }
.thr.check input { accent-color: var(--accent); }
.thr-num {
  width: 52px;
  min-height: 28px;
  padding: 0 6px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: #050805;
  color: var(--ink);
  font-family: monospace;
  font-size: 12px;
}
.thr-val {
  min-width: 28px;
  font-family: monospace;
  color: var(--accent);
}

.previews {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  align-items: start;
}

figure {
  margin: 0;
  border: 1px solid rgba(64, 255, 94, 0.16);
  border-radius: 6px;
  overflow: hidden;
  background: #000;
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

figcaption {
  padding: 8px 10px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-bottom: 1px solid rgba(64, 255, 94, 0.1);
}

canvas {
  display: block;
  width: 100%;
  height: auto !important;
  max-height: 480px;
  object-fit: contain;
  background: #000;
  image-rendering: auto;
}

.checker {
  background:
    linear-gradient(45deg, #181818 25%, transparent 25%),
    linear-gradient(-45deg, #181818 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #181818 75%),
    linear-gradient(-45deg, transparent 75%, #181818 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
}

.status, .url {
  margin-top: 14px;
  font-size: 13px;
  color: var(--muted);
  word-break: break-all;
}

.url {
  color: var(--accent);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 10px 12px;
}

@media (max-width: 720px) {
  .previews { grid-template-columns: 1fr; }
}