/* ─────────────────────────────────────────────────────────────
   BSS-CLI — portfolio site stylesheet
   Single column, long-form, dark by default. Quiet and technical.
   ───────────────────────────────────────────────────────────── */

/* ── Tokens ─────────────────────────────────────────────────── */
:root {
  --bg:         #0e1014;
  --surface:    #161a20;
  --border:     #262b33;
  --text:       #d8d8d4;
  --muted:      #8a8d93;
  --accent:     #7ee787;  /* phosphor green */
  --accent-2:   #f0883e;  /* used sparingly */
  --link-hover: #a8f0af;

  --font-body: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --content-w:  880px;
  --radius:     6px;
}

/* ── Reset-ish ──────────────────────────────────────────────── */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; display: block; }

/* ── Page frame ─────────────────────────────────────────────── */
.page {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 72px 28px 96px;
  counter-reset: section;        /* for numbered h2 headings */
  animation: fade-in-page 520ms ease-out both;
}

@keyframes fade-in-page {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

@media (max-width: 560px) {
  .page { padding: 48px 20px 64px; }
}

/* ── Headings ───────────────────────────────────────────────── */
h1, h2, h3 {
  font-family: var(--font-mono);
  color: var(--accent);
  letter-spacing: 0;
  line-height: 1.3;
  font-weight: 600;
}

h2 {
  font-size: 1.35rem;
  margin: 0 0 24px;
}

/* Numbered section prefix: 01, 02, 03 … rendered in quiet orange */
section { counter-increment: section; }
section > h2::before {
  content: counter(section, decimal-leading-zero);
  color: var(--accent-2);
  opacity: 0.7;
  margin-right: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

h3 {
  font-size: 1rem;
  margin: 32px 0 8px;
  color: var(--text);
}

/* ── Links ──────────────────────────────────────────────────── */
a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(126, 231, 135, 0.25);
  transition: color 120ms ease, border-color 120ms ease;
}
a:hover,
a:focus-visible {
  color: var(--link-hover);
  border-bottom-color: var(--link-hover);
}
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

/* ── Inline code ────────────────────────────────────────────── */
code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--text);
}

/* ── Rules between sections ─────────────────────────────────── */
.rule {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 56px 0;
}

/* ── Section spacing ────────────────────────────────────────── */
section p { margin: 0 0 16px; }
section p:last-child { margin-bottom: 0; }

/* ── Header ─────────────────────────────────────────────────── */
.site-header { margin-bottom: 8px; }

/* ASCII block-letter banner (decorative, aria-hidden) */
.banner {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: clamp(0.46rem, 1.55vw, 0.78rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 28px;
  padding: 0;
  background: transparent;
  border: 0;
  white-space: pre;
  overflow-x: auto;
  text-shadow: 0 0 12px rgba(126, 231, 135, 0.32);
}

.title-row {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

.project-name {
  font-family: var(--font-mono);
  color: var(--text);
  font-size: 1.6rem;
  margin: 0;
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
}

.prompt-sigil {
  color: var(--accent);
  opacity: 0.8;
  font-weight: 500;
}

/* Blinking terminal cursor after the project name */
.cursor {
  display: inline-block;
  width: 0.55em;
  height: 1em;
  margin-left: 4px;
  background: var(--accent);
  vertical-align: -0.12em;
  box-shadow: 0 0 10px rgba(126, 231, 135, 0.55);
  animation: cursor-blink 1.1s steps(2) infinite;
}
@keyframes cursor-blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0; }
}

.version-pill {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 3px 9px;
  border: 1px solid var(--accent-2);
  color: var(--accent-2);
  border-radius: 999px;
  line-height: 1.2;
  white-space: nowrap;
}

.tagline {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 14px 0 16px;
  max-width: 60ch;
}

.repo-url {
  font-family: var(--font-mono);
  font-size: 1rem;
  margin: 0 0 22px;
  word-break: break-all;
}
.repo-url a {
  color: var(--accent);
  border-bottom: 1px solid rgba(126, 231, 135, 0.4);
  padding-bottom: 1px;
}
.repo-url a::before {
  content: '→ ';
  color: var(--muted);
  margin-right: 2px;
}

.header-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.ghost-button {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text);
  border: 1px solid var(--border);
  border-bottom: 1px solid var(--border); /* neutralise link underline */
  background: transparent;
  padding: 6px 14px;
  border-radius: var(--radius);
  transition: border-color 120ms ease, color 120ms ease, background 120ms ease;
}
.ghost-button:hover,
.ghost-button:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(126, 231, 135, 0.04);
}

/* ── Plain ordered list (the "three things at once") ────────── */
.plain-list {
  margin: 12px 0 0;
  padding-left: 1.4em;
}
.plain-list li { margin: 6px 0; }

/* ── The seven principles ───────────────────────────────────── */
.principles {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  counter-reset: principle;
  display: grid;
  gap: 18px;
}
.principles li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  align-items: start;
}
.principle-num {
  font-family: var(--font-mono);
  color: var(--accent-2);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.3;
  text-align: right;
  padding-top: 1px;
}
.principles strong {
  color: var(--text);
  font-weight: 600;
}
.principles li > div { max-width: 62ch; }

@media (max-width: 560px) {
  .principles li { grid-template-columns: 28px 1fr; gap: 12px; }
  .principle-num { font-size: 1.1rem; }
}

/* ── ASCII / code blocks ────────────────────────────────────── */
.ascii-block {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.4;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 16px 20px;
  border-radius: var(--radius);
  color: var(--text);
  margin: 20px 0 0;
  overflow-x: auto;      /* wide diagrams scroll, never wrap */
  white-space: pre;      /* preserve ASCII art exactly */
  tab-size: 4;
}

/* ── Callout (e.g. "demo only" note on portals) ─────────────── */
.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-2);
  padding: 14px 18px;
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.96rem;
}
.callout strong { color: var(--accent-2); }

/* ── Figures (images) ───────────────────────────────────────── */
.feature-figure,
.portal-figure {
  margin: 0 0 24px;
}

.feature-figure img,
.portal-figure img {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  width: 100%;
}

.feature-figure {
  margin: 8px 0 32px;
}

figcaption {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 10px;
  line-height: 1.5;
}

/* Side-by-side feature pair (trace + Jaeger) ─ stacks on narrow */
.pair {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr 1fr;
  margin: 8px 0 4px;
}
.pair .feature-figure { margin: 0; }

@media (max-width: 720px) {
  .pair { grid-template-columns: 1fr; }
}

.pair-caption {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 8px 0 20px !important;
}

/* ── What's shipped (numbers) ───────────────────────────────── */
.numbers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 32px;
  margin: 0;
}
.numbers > div {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 0;
  border-top: 1px solid var(--border);
}
.numbers > div { padding: 16px 0; }
.numbers dt {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: lowercase;
  letter-spacing: 0.02em;
}
.numbers dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.55rem;
  font-weight: 500;
  line-height: 1.25;
  color: var(--accent);
  text-shadow: 0 0 14px rgba(126, 231, 135, 0.18);
}

@media (max-width: 560px) {
  .numbers { grid-template-columns: 1fr; gap: 0; }
}

/* ── Tech stack tags ────────────────────────────────────────── */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
}
.tag {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 4px 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  line-height: 1.4;
  white-space: nowrap;
  transition: border-color 160ms ease, color 160ms ease, transform 160ms ease;
}
.tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* Principle hover — nudge the number into the green */
.principles li .principle-num { transition: color 160ms ease, text-shadow 160ms ease; }
.principles li:hover .principle-num {
  color: var(--accent);
  text-shadow: 0 0 12px rgba(126, 231, 135, 0.45);
}

/* ── Versions timeline ──────────────────────────────────────── */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.timeline li {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 18px;
  padding: 14px 0;
  border-top: 1px solid var(--border);
  align-items: baseline;
}
.timeline li:last-child { border-bottom: 1px solid var(--border); }
.timeline .ver {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.95rem;
}

@media (max-width: 560px) {
  .timeline li { grid-template-columns: 56px 1fr; gap: 12px; }
}

/* ── Footer ─────────────────────────────────────────────────── */
.site-footer {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-align: left;
}
.site-footer p { margin: 4px 0; }
.site-footer a { color: var(--muted); border-bottom-color: rgba(138, 141, 147, 0.3); }
.site-footer a:hover,
.site-footer a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.footer-note { opacity: 0.75; }

/* ── Selection ──────────────────────────────────────────────── */
::selection {
  background: rgba(126, 231, 135, 0.25);
  color: var(--text);
}

/* ── Respect reduced motion preferences ─────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .page   { animation: none; }
  .cursor { animation: none; }
  .tag,
  .principles li .principle-num { transition: none; }
}