:root {
  --bg: #030303;
  --card: #080808;
  --muted: #0f0f0f;
  --border: #1c1c1c;
  --fg: #f0f0f0;
  --dim: #606060;
  --red: #f87171;
  --green: #4ade80;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'JetBrains Mono', monospace;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }

nav {
  border-bottom: 1px solid var(--border);
  background: var(--card);
  padding: 0.6rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-brand { font-size: 0.95rem; font-weight: 600; letter-spacing: 0.08em; color: var(--red); }
.nav-links { display: flex; gap: 1.5rem; }
.nav-links a { font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--dim); transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--red); }
.pulse { font-size: 0.65rem; color: var(--red); display: flex; align-items: center; gap: 0.35rem; }
.pulse::before {
  content: ''; width: 6px; height: 6px; background: var(--red); display: block;
  animation: p 2s ease-in-out infinite;
}
@keyframes p { 0%, 100% { opacity: 1; } 50% { opacity: 0.2; } }

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}
header { margin-bottom: 2.5rem; }
.eyebrow { font-size: 0.65rem; letter-spacing: 0.15em; color: var(--red); margin-bottom: 0.5rem; text-transform: uppercase; }
h1 { font-size: 1.8rem; font-weight: 700; margin-bottom: 0.5rem; }
.sub { font-size: 0.8rem; color: var(--dim); line-height: 1.6; }

.tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}
.tab {
  background: transparent;
  border: none;
  color: var(--dim);
  padding: 0.8rem 1.5rem;
  font-family: inherit;
  font-size: 0.8rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.tab:hover { color: var(--fg); }
.tab.active { color: var(--red); border-bottom-color: var(--red); }

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 2rem;
}

.field { margin-bottom: 1.5rem; }
.field label {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--fg);
  margin-bottom: 0.6rem;
  text-transform: uppercase;
}

.dropzone {
  border: 1px dashed var(--dim);
  background: var(--muted);
  padding: 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--dim);
  cursor: pointer;
  transition: border-color 0.2s;
}
.dropzone:hover, .dropzone.dragover { border-color: var(--red); color: var(--red); }

.preview {
  display: none;
  max-width: 100%;
  max-height: 250px;
  margin-top: 1rem;
  border: 1px solid var(--border);
}

textarea {
  width: 100%;
  background: var(--muted);
  border: 1px solid var(--border);
  color: var(--green);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  padding: 1rem;
  resize: vertical;
  min-height: 120px;
  outline: none;
}
textarea:focus { border-color: var(--red); }

.status {
  font-size: 0.65rem;
  color: var(--dim);
  margin-top: 0.4rem;
  text-align: right;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 1.5rem;
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  width: 100%;
  transition: opacity 0.2s;
}
.btn-red { background: var(--red); color: #000; }
.btn-red:hover { opacity: 0.9; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.msg {
  font-size: 0.75rem;
  padding: 0.8rem;
  margin-top: 1rem;
  display: none;
  border-left: 2px solid;
}
.msg.show { display: block; }
.msg.ok { border-color: var(--green); color: var(--green); background: rgba(74, 222, 128, 0.1); }
.msg.err { border-color: var(--red); color: var(--red); background: rgba(248, 113, 113, 0.1); }