/* ─── Header — title-block strip ─────────────────────────────── */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 36px;
  padding: 14px 18px;
  background: var(--panel);
  border: 1.5px solid var(--rule);
  position: relative;
}
/* inner double-rule (title-block style) */
header::before {
  content: '';
  position: absolute;
  inset: 3px;
  border: 1px solid var(--border);
  pointer-events: none;
}

.brand { display: flex; align-items: center; gap: 14px; position: relative; z-index: 1; }

/* small stamp seal — block-letter mark */
.brand .seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px; height: 38px;
  flex-shrink: 0;
  font-family: var(--display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--bg-main);
  background: var(--blueprint);
  border: 1px solid var(--blueprint-lo);
  border-radius: 1px;
  box-shadow: 0 1px 0 var(--blueprint-lo);
}
[data-theme="dark"] .brand .seal {
  color: var(--bg-deep);
  background: var(--blueprint);
  border-color: var(--blueprint-hi);
}

.brand-text { display: flex; flex-direction: column; gap: 2px; line-height: 1.05; }

.logo {
  font-family: var(--display);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  color: var(--ink);
  line-height: 1;
}
.logo .amp { color: var(--rust); padding: 0 1px; font-weight: 500; }

.tagline {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  text-transform: uppercase;
  display: flex;
  gap: 6px;
  align-items: center;
}
.tagline .tag-tok { color: var(--blueprint); }
[data-theme="light"] .tagline .tag-tok { color: var(--blueprint-lo); }
.tagline .tag-sep { color: var(--ink-faint); opacity: 0.7; }

.header-controls { display: flex; align-items: center; gap: 18px; position: relative; z-index: 1; }

.status-bar {
  display: flex;
  gap: 16px;
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
  align-items: center;
}
.status-bar span { white-space: nowrap; }

.status-bar .dot {
  display: inline-block;
  width: 7px; height: 7px;
  background: var(--good);
  border-radius: 50%;
  margin-right: 6px;
  box-shadow: 0 0 6px var(--good), inset 0 -1px 1px rgba(0,0,0,.3);
  animation: pulse 2.6s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.45} }

/* ─── Theme toggle ── */
.theme-toggle {
  width: 32px; height: 32px;
  border-radius: 1px;
  background: var(--panel-hi);
  border: 1px solid var(--border-strong);
  color: var(--ink-soft);
  transition: color .15s ease, border-color .15s ease;
}
.theme-toggle:hover { color: var(--rust); border-color: var(--rust); }
[data-theme="dark"]  .sun-icon  { display: block; }
[data-theme="dark"]  .moon-icon { display: none;  }
[data-theme="light"] .sun-icon  { display: none;  }
[data-theme="light"] .moon-icon { display: block; }