/* ─────────────────────────────────────────
   base.css — variables, reset, layout, nav
   ───────────────────────────────────────── */

:root {
  --ink:       #0d1624;
  --panel:     #121e30;
  --panel-2:   #0e1928;
  --border:    #1c2d42;
  --border-2:  #253d58;
  --txt:       #dde6f0;
  --dim:       #6e7f96;
  --faint:     #7a9ab8;
  --amber:     #ffb000;
  --amber-s:   #ffc94d;
  --amber-bg:  rgba(255, 176, 0, 0.1);
  --good:      #3ecf75;
  --bad:       #f05252;
  --host-bit:  #1e3050;

  --font-mono: 'IBM Plex Mono', monospace;
  --font-display: 'Archivo', sans-serif;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background-color: var(--ink);
  color: var(--txt);
  font-family: var(--font-mono);
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 1060px;
  margin: 0 auto;
  padding: clamp(16px, 3vw, 36px) clamp(12px, 2.5vw, 28px);
}

/* ── Header ──────────────────────────────── */
header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  border-bottom: 1px solid var(--border-2);
  padding-bottom: 16px;
  margin-bottom: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo {
  width: 32px;
  height: 32px;
  border: 1px solid var(--amber);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  padding: 4px;
  flex: none;
}

.logo i {
  background: var(--host-bit);
  display: block;
}

.logo i:first-child {
  background: var(--amber);
}

h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2.6vw, 24px);
  letter-spacing: -0.02em;
  line-height: 1;
}

h1 span { color: var(--amber); }

.page-sub {
  font-size: 11px;
  color: var(--dim);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-top: 4px;
}

.back {
  font-size: 12px;
  color: var(--dim);
  text-decoration: none;
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color 0.15s;
}

.back:hover { color: var(--amber); }

/* ── Tab navigation ──────────────────────── */
.tab-nav {
  display: flex;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
  overflow-x: auto;
}

.tab-btn {
  padding: 14px 20px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--dim);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  letter-spacing: 0.04em;
  transition: color 0.15s, border-color 0.15s;
}

.tab-btn:hover { color: var(--txt); }

.tab-btn.active {
  color: var(--amber-s);
  border-bottom-color: var(--amber);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Footer ──────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 16px 0;
  margin-top: 32px;
  font-size: 11px;
  color: var(--faint);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: center;
}

/* ── Responsive ──────────────────────────── */
@media (max-width: 480px) {
  .tab-btn { padding: 12px 14px; font-size: 12px; }
}