:root {
  --bg: #0f1420;
  --panel: #171d2c;
  --panel-2: #1d2537;
  --border: #2a3350;
  --text: #e6e9f2;
  --muted: #8b94ab;
  --accent: #4f8cff;
  --accent-2: #ff5722;
  --danger: #e5484d;
  --ok: #46a758;
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
}

body {
  display: flex;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.45;
}

/* ---------- Sidebar ---------- */
.sidebar {
  width: 330px;
  flex-shrink: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 18px 16px 24px;
  background: var(--panel);
  border-right: 1px solid var(--border);
}

.sidebar h1 {
  margin: 0 0 2px;
  font-size: 21px;
  letter-spacing: 0.3px;
}
.sidebar h1 span { color: var(--accent-2); }
.tagline { margin: 0 0 16px; color: var(--muted); font-size: 13px; }

.card {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  margin-bottom: 14px;
}

.card h2 {
  margin: 0 0 10px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
}

label {
  display: block;
  margin: 10px 0 4px;
  font-size: 12px;
  color: var(--muted);
}

select, input[type="text"], textarea {
  width: 100%;
  padding: 7px 9px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  color: var(--text);
  font-size: 13px;
}
textarea {
  resize: vertical;
  font-family: inherit;
}
select:focus, input:focus, textarea:focus { outline: none; border-color: var(--accent); }

input[type="range"] { width: 100%; accent-color: var(--accent); }
input[type="color"] { width: 100%; height: 32px; padding: 2px; border: 1px solid var(--border); border-radius: 7px; background: var(--bg); cursor: pointer; }

.val { color: var(--accent); font-weight: 600; }

.hint { font-size: 11px; color: var(--muted); margin: 5px 0 0; }
.link { color: var(--accent); text-decoration: none; }
.link:hover { text-decoration: underline; }

/* ---------- Dropzone ---------- */
.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 18px 10px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  margin-bottom: 10px;
}
.dropzone:hover, .dropzone.drag {
  border-color: var(--accent);
  background: rgba(79, 140, 255, 0.08);
}
.dropzone p { margin: 0; color: var(--muted); }
.dropzone strong { color: var(--text); }

/* ---------- Track info ---------- */
.track-info {
  margin-top: 10px;
  padding: 9px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  font-size: 12px;
  color: var(--muted);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px 10px;
}
.track-info b { color: var(--text); font-weight: 600; }
.hidden { display: none !important; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  width: 100%;
  padding: 9px 12px;
  margin-top: 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, opacity 0.15s;
}
.btn:hover:not(:disabled) { background: #26304a; border-color: var(--accent); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-primary:hover:not(:disabled) { background: #3d7bf0; }
.btn-danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}
.btn-danger:hover:not(:disabled) { background: rgba(229, 72, 77, 0.12); }

.btnrow { display: flex; gap: 8px; }
.btnrow .btn { flex: 1; margin-top: 8px; }

/* ---------- Status / log / progress ---------- */
.status { margin: 12px 0 6px; font-size: 12px; color: var(--muted); min-height: 16px; }
.status.err { color: var(--danger); }
.status.ok { color: var(--ok); }

.progress {
  height: 8px;
  background: var(--bg);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 10px;
  border: 1px solid var(--border);
}
#progressBar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.1s linear;
}

.log {
  margin: 8px 0 0;
  padding: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 7px;
  max-height: 130px;
  overflow-y: auto;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 11px;
  color: var(--muted);
  white-space: pre-wrap;
  word-break: break-word;
}

.checks { margin-top: 12px; display: grid; gap: 6px; }
.check { display: flex; align-items: center; gap: 7px; margin: 0; color: var(--text); font-size: 13px; cursor: pointer; }
.check input { accent-color: var(--accent); width: auto; }

.footer { font-size: 11px; color: var(--muted); margin: 4px 2px 0; }

.reset-btn {
  background: none;
  border: none;
  padding: 0;
  margin: 0 0 0 4px;
  font-size: 11px;
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
}
.reset-btn:hover { color: #7cabff; }

/* ---------- Stage ---------- */
.stage {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  position: relative;
  background:
    radial-gradient(circle at 50% 40%, #141b2c 0%, var(--bg) 70%);
}

#canvas {
  max-width: 100%;
  max-height: 100%;
  border-radius: 8px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.55);
  background: #0b0f18;
}

.stage-hint {
  position: absolute;
  color: var(--muted);
  font-size: 15px;
  text-align: center;
  max-width: 420px;
  pointer-events: none;
}
.stage-hint em { color: var(--accent); font-style: normal; }

@media (max-width: 900px) {
  body { flex-direction: column; }
  .sidebar { width: 100%; height: auto; max-height: 45vh; }
  .stage { min-height: 50vh; }
}