/* ── HEADER ── */
header {
  height: 52px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 16px;
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
}
.logo {
  font-family: 'Syne', sans-serif;
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.5px;
  color: var(--text);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.logo span { color: var(--accent); }
.logo-byline {
  font-size: 8px;
  font-family: 'DM Mono', monospace;
  font-weight: 300;
  color: var(--text-muted);
  letter-spacing: 0.8px;
  text-transform: uppercase;
  line-height: 1;
}

.nav-tabs {
  display: flex;
  gap: 2px;
  background: var(--bg);
  border-radius: 7px;
  padding: 3px;
  border: 1px solid var(--border);
}
.nav-tab {
  padding: 5px 14px;
  border-radius: 5px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.nav-tab.active {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}
#tab-projects {
  color: var(--text-muted);
  border-right: 1px solid var(--border);
  margin-right: 2px;
  padding-right: 16px;
}
.nav-tab:hover:not(.active) { color: var(--text); }

.header-right { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.proj-info {
  font-size: 11px;
  font-family: 'DM Mono', monospace;
  color: var(--text-muted);
  padding: 6px 13px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--bg);
  cursor: pointer;
  transition: all 0.15s;
  display: flex; align-items: center; gap: 5px;
  white-space: nowrap;
}
.proj-info:hover { border-color: var(--border2); color: var(--text); }
.proj-info span { color: var(--accent); }

.btn {
  padding: 6px 13px;
  border-radius: 5px;
  border: 1px solid var(--border);
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  cursor: pointer;
  display: flex; align-items: center; gap: 5px;
  transition: all 0.15s;
  white-space: nowrap;
}
.btn-ghost { background: transparent; color: var(--text-muted); }
.btn-ghost:hover { background: var(--surface2); color: var(--text); border-color: var(--border2); }
.btn-accent { background: var(--accent); color: #000; border-color: var(--accent); font-weight: 500; }
.btn-accent:hover { background: #cc8c15; }
.btn-calc-stale { background: var(--danger) !important; border-color: var(--danger) !important; color: #fff !important; }
.btn-calc-stale:hover { background: #c03030 !important; }
.btn-calc-ok { background: var(--tg) !important; border-color: var(--tg) !important; color: #000 !important; }
.btn-calc-ok:hover { background: #28a858 !important; }
.btn-blue { background: var(--accent2); color: #000; border-color: var(--accent2); font-weight: 500; }
.btn-blue:hover { background: #3a90e0; }
.btn-green { background: var(--tg); color: #000; border-color: var(--tg); font-weight: 500; }
.btn-green:hover { background: #28a858; }
.btn-sm { padding: 4px 9px; font-size: 10px; }
.btn-danger { background: rgba(240,80,80,0.15); color: var(--danger); border-color: rgba(240,80,80,0.3); }
.btn-danger:hover { background: rgba(240,80,80,0.25); }