* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: #0a0a0a;
  color: #00ff41;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ── Top bar ─────────────────────────────────────────────── */
#header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: #0f0f0f;
  border-bottom: 1px solid #1a1a1a;
  flex-shrink: 0;
  flex-wrap: nowrap;
  overflow-x: auto;
}

#logo {
  font-weight: 700;
  color: #00ff41;
  font-size: 13px;
  letter-spacing: 1px;
  margin-right: 6px;
  white-space: nowrap;
}

/* ── Shared button style ─────────────────────────────────── */
.hdr-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 4px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  border: 1px solid #2a2a2a;
  background: #161616;
  color: #888;
  transition: all 0.15s;
  user-select: none;
}
.hdr-btn:hover { background: #1f1f1f; color: #bbb; }

/* ── Diagnostic buttons ──────────────────────────────────── */
.diag-btn            { cursor: default; }
.diag-btn:hover      { background: #161616; }

.diag-btn.red        { border-color: #ff444433; color: #ff6666; background: #1a0808; }
.diag-btn.yellow     { border-color: #ffaa0033; color: #ffcc44; background: #1a1400; }
.diag-btn.green      { border-color: #00ff4133; color: #00ff41; background: #001a0a; }

.diag-dot { font-size: 9px; }

/* ── Action buttons ──────────────────────────────────────── */
.act-btn             { color: #00ff41; border-color: #00ff4133; }
.act-btn:hover       { background: #00ff4115; color: #44ff77; border-color: #00ff4166; }

.act-btn.amber       { color: #ffaa44; border-color: #ffaa4433; }
.act-btn.amber:hover { background: #ffaa4415; border-color: #ffaa4466; }

.act-btn.red-btn     { color: #ff6666; border-color: #ff444433; }
.act-btn.red-btn:hover { background: #ff444415; }

.act-btn.muted       { color: #555; border-color: #2a2a2a; }
.act-btn.muted:hover { color: #888; }

/* ── F-key buttons ───────────────────────────────────────── */
.fkey-btn {
  color: #4a9eff;
  border-color: #4a9eff33;
  font-size: 10px;
  padding: 4px 8px;
}
.fkey-btn:hover { background: #4a9eff15; border-color: #4a9eff66; }
.fkey-btn .fkey-label { color: #2a6aaa; font-size: 9px; }

/* ── Divider ─────────────────────────────────────────────── */
.hdr-sep {
  color: #2a2a2a;
  font-size: 16px;
  padding: 0 2px;
  user-select: none;
}

/* ── Session info ────────────────────────────────────────── */
#session-info {
  font-size: 11px;
  color: #444;
  margin-left: 4px;
  white-space: nowrap;
  flex: 1;
}

/* ── Terminal ────────────────────────────────────────────── */
#terminal-container {
  flex: 1;
  padding: 6px 8px;
  overflow: hidden;
}

/* ── Footer ──────────────────────────────────────────────── */
#footer {
  display: flex;
  gap: 20px;
  padding: 3px 12px;
  background: #0f0f0f;
  border-top: 1px solid #1a1a1a;
  font-size: 10px;
  color: #333;
  flex-shrink: 0;
}
#footer-diag { color: #444; }

.xterm { height: 100%; }
.xterm-viewport { overflow-y: auto !important; }