:root {
  --accent4: #79c0ff;
}

/* NAV */
nav {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
  position: sticky;
  top: 0;
  background: rgba(8,11,15,0.92);
  backdrop-filter: blur(12px);
  z-index: 100;
}
nav .inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
nav a {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--muted);
  transition: color 0.2s;
  cursor: none;
}
nav a:hover { color: var(--accent); }
nav .logo { color: var(--accent) !important; font-weight: 600; }

.nav-distros {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.nav-distro-btn {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  padding: 4px 10px;
  border-radius: 4px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: none;
  transition: all 0.2s;
  letter-spacing: 0.05em;
}
.nav-distro-btn:hover,
.nav-distro-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0,255,157,0.06);
}

/* LAYOUT */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

/* HEADER */
.page-header {
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--border);
  animation: fadeIn 0.4s ease both;
}
.page-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent2);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-tag::before { content: ''; display: inline-block; width: 24px; height: 1px; background: var(--accent2); }

.page-header h1 {
  font-family: var(--font-body);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: 14px;
}
.page-header .subtitle {
  font-size: 1rem;
  color: var(--muted);
  font-style: italic;
  line-height: 1.6;
  max-width: 580px;
}

/* INTRO BOX */
.intro-box {
  margin: 40px 0 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent4);
  border-radius: 8px;
  padding: 24px 28px;
  animation: fadeIn 0.4s ease 0.1s both;
}
.intro-box h2 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent4);
  margin-bottom: 12px;
}
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  margin-top: 14px;
}
.feature {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 8px;
}
.feature span { color: var(--accent); }

/* DISTRO TABS */
.distro-tabs {
  display: flex;
  gap: 6px;
  margin: 48px 0 0;
  flex-wrap: wrap;
  animation: fadeIn 0.4s ease 0.2s both;
}
.tab-btn {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 9px 18px;
  border-radius: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: none;
  transition: all 0.2s;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 7px;
}
.tab-btn:hover { border-color: var(--dim); color: var(--text); }
.tab-btn.active {
  background: rgba(0,255,157,0.08);
  border-color: rgba(0,255,157,0.35);
  color: var(--accent);
}

/* DISTRO PANELS */
.distro-panel {
  display: none;
  animation: fadeIn 0.3s ease both;
  margin-top: 24px;
}
.distro-panel.active { display: block; }

/* STEPS */
.steps { display: flex; flex-direction: column; gap: 16px; }

.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.2s;
}
.step:hover { border-color: var(--dim); }

.step-header {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
}
.step-num {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: rgba(0,255,157,0.1);
  border: 1px solid rgba(0,255,157,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--accent);
  flex-shrink: 0;
}
.step-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
  flex: 1;
}
.step-desc {
  padding: 0 20px 16px 62px;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.65;
}
.step-desc strong { color: var(--text); }

/* CODE BLOCK */
.code-block {
  margin: 12px 20px 16px 62px;
  background: #060910;
  border: 1px solid #1a2535;
  border-radius: 8px;
  overflow: hidden;
}
.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 14px;
  border-bottom: 1px solid #1a2535;
  background: #0a0d13;
}
.code-lang {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim);
}
.copy-btn {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  background: #1a2535;
  border: none;
  color: var(--muted);
  padding: 3px 10px;
  border-radius: 4px;
  cursor: none;
  transition: all 0.2s;
  letter-spacing: 0.04em;
}
.copy-btn:hover { background: var(--accent); color: #080b0f; }
.code-block pre {
  padding: 14px 16px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.8;
  color: var(--accent);
}
.code-block pre .comment { color: var(--dim); }
.code-block pre .flag { color: var(--accent3); }
.code-block pre .str { color: #ffa657; }
.code-block pre .path { color: #79c0ff; }
.code-block pre .muted { color: var(--muted); }

/* CALLOUT */
.callout {
  margin: 8px 20px 16px 62px;
  border-radius: 6px;
  padding: 12px 16px;
  font-size: 0.82rem;
  line-height: 1.6;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.callout.tip  { background: rgba(0,255,157,0.04);  border: 1px solid rgba(0,255,157,0.15);  color: var(--muted); }
.callout.warn { background: rgba(255,214,10,0.04);  border: 1px solid rgba(255,214,10,0.15);  color: var(--muted); }
.callout.info { background: rgba(121,192,255,0.04); border: 1px solid rgba(121,192,255,0.15); color: var(--muted); }
.callout-icon { flex-shrink: 0; font-size: 0.9rem; margin-top: 1px; }
.callout strong { color: var(--text); }
.callout code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: rgba(0,0,0,0.3);
  padding: 1px 6px;
  border-radius: 3px;
  color: var(--accent3);
}

/* VERIFY BOX */
.verify-box {
  margin-top: 32px;
  background: rgba(63,185,80,0.05);
  border: 1px solid rgba(63,185,80,0.2);
  border-radius: 10px;
  padding: 20px 24px;
}
.verify-box h3 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #3fb950;
  margin-bottom: 12px;
}
.verify-box p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.65;
  margin-bottom: 10px;
}
.verify-box p:last-child { margin-bottom: 0; }

/* BONUS / TL;DR step */
.step-bonus .step-num {
  background: rgba(255,214,10,0.1);
  border-color: rgba(255,214,10,0.2);
  color: var(--accent3);
  font-size: 0.6rem;
  width: 32px;
  border-radius: 4px;
}

/* TROUBLESHOOT */
.troubleshoot {
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
  animation: fadeIn 0.4s ease 0.3s both;
}
.troubleshoot h2 {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent2);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.troubleshoot h2::after { content: ''; flex: 1; height: 1px; background: var(--border); }

.trouble-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 10px;
  overflow: hidden;
}
.trouble-q {
  padding: 14px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  cursor: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  transition: background 0.2s;
}
.trouble-q:hover { background: var(--surface2); }
.trouble-q .arrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--dim);
  transition: transform 0.2s;
  flex-shrink: 0;
}
.trouble-item.open .trouble-q .arrow { transform: rotate(90deg); color: var(--accent); }
.trouble-a {
  display: none;
  padding: 0 18px 16px;
  font-size: 0.87rem;
  color: var(--muted);
  line-height: 1.7;
  border-top: 1px solid var(--border);
}
.trouble-item.open .trouble-a { display: block; padding-top: 14px; }
.trouble-a code {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  padding: 2px 7px;
  border-radius: 4px;
  color: var(--accent3);
}

/* FOOTER */
footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 48px;
  margin-top: 64px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-sig { font-family: var(--font-mono); font-size: 0.65rem; color: var(--dim); }
.footer-sig span { color: var(--accent2); }
.footer-links { display: flex; gap: 20px; }
.footer-links a {
  font-family: var(--font-mono); font-size: 0.65rem; color: var(--dim);
  text-decoration: none; letter-spacing: 0.06em; transition: color 0.2s; cursor: none;
}
.footer-links a:hover { color: var(--accent); }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
  .nav-distros { display: none; }
  .step-desc, .code-block, .callout { margin-left: 20px; }
  .features { grid-template-columns: 1fr 1fr; }
}