/* ──────────────────────────────────────────────────────────────
   base.css — document reset, nav, buttons, footer, layout shells,
   and the terminal signature component shared by every page.
   ────────────────────────────────────────────────────────────── */

/* ── Reset & document ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: var(--text-base);
  line-height: var(--leading);
  width: 100%;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

body.nav-open {
  overflow: hidden;
}

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

p,
li,
a,
span {
  overflow-wrap: break-word;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
}

/* ── Skip link ── */
.skip-link {
  position: absolute;
  top: 0.5rem;
  left: var(--space-page-x);
  z-index: 10000;
  padding: 0.65rem 1rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  text-decoration: none;
  color: var(--on-teal);
  background: var(--teal);
  border-radius: var(--radius-sm);
  transform: translateY(-200%);
  transition: transform var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ── Screen-reader-only ── */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ── Focus ── */
:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ── Navigation (mobile-first) ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  min-height: var(--nav-height);
  padding: 0.5rem var(--space-page-x);
  padding-top: max(0.5rem, env(safe-area-inset-top, 0px));
  border-bottom: 1px solid transparent;
  transition:
    border-color var(--duration-normal),
    background var(--duration-normal);
}

nav.scrolled,
nav.nav-solid {
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-color: var(--panel-border);
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--teal);
  letter-spacing: 0.04em;
  text-decoration: none;
  min-height: var(--touch-min);
  display: inline-flex;
  align-items: center;
}

.nav-logo::before {
  content: "$\00a0";
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--text-muted);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  order: 2;
}

.nav-menu-btn {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: var(--touch-min);
  height: var(--touch-min);
  padding: 0;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
}

.nav-menu-bar {
  display: block;
  width: 1.1rem;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
  transition:
    transform var(--duration-fast) ease,
    opacity var(--duration-fast) ease;
}

nav.nav-open .nav-menu-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

nav.nav-open .nav-menu-bar:nth-child(2) {
  opacity: 0;
}

nav.nav-open .nav-menu-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu panel — full-width drawer below the bar */
.nav-panel {
  order: 3;
  flex: 1 1 100%;
  width: 100%;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition:
    max-height var(--duration-normal) var(--ease-out),
    opacity var(--duration-fast),
    visibility var(--duration-fast),
    border-color var(--duration-normal);
}

nav.nav-open .nav-panel {
  max-height: min(70vh, 26rem);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  border-bottom-color: var(--panel-border);
  padding-bottom: 1rem;
}

.nav-panel .nav-links {
  display: flex;
  flex-direction: column;
  gap: 0;
  width: 100%;
  list-style: none;
}

.nav-panel .nav-links a {
  display: flex;
  align-items: center;
  min-height: var(--touch-min);
  padding: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--hairline);
  transition:
    color var(--duration-fast),
    padding-left var(--duration-fast);
}

.nav-panel .nav-links li:last-child a {
  border-bottom: none;
}

.nav-links a::before {
  content: "#\00a0";
  color: var(--text-muted);
  opacity: 0.6;
}

.nav-links a.active,
.nav-links a[aria-current="page"] {
  color: var(--teal);
}

@media (hover: hover) {
  .nav-links a:hover {
    color: var(--teal);
  }
  .nav-panel .nav-links a:hover {
    padding-left: 0.85rem;
  }
}

.theme-toggle {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 999px;
  min-height: var(--touch-min);
  padding: 0 0.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
  transition:
    color var(--duration-fast),
    border-color var(--duration-fast);
}

@media (hover: hover) {
  .theme-toggle:hover {
    color: var(--teal);
    border-color: var(--teal-dim);
  }
}

.theme-toggle .theme-icon {
  font-size: 0.78rem;
  line-height: 1;
}

/* ── Buttons ── */
.btn-primary,
.btn-secondary {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  min-height: var(--touch-min);
  padding: 0.75rem 1.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    opacity var(--duration-fast),
    color var(--duration-fast),
    background var(--duration-fast),
    border-color var(--duration-fast),
    transform var(--duration-fast);
}

.btn-primary {
  color: var(--on-teal);
  background: var(--teal);
  border: 1px solid var(--teal);
  font-weight: 700;
}

.btn-secondary {
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--panel-border);
}

@media (hover: hover) {
  .btn-primary:hover {
    opacity: 0.88;
  }
  .btn-secondary:hover {
    color: var(--teal);
    border-color: var(--teal-dim);
  }
  @media (prefers-reduced-motion: no-preference) {
    .btn-primary:hover,
    .btn-secondary:hover {
      transform: translateY(-1px);
    }
  }
}

/* ──────────────────────────────────────────────────────────────
   Terminal signature component.
   The one visual motif on this site — reused wherever a
   "live state" moment fits. Do not introduce a competing one.
   ────────────────────────────────────────────────────────────── */
.terminal {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  width: 100%;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 0.85rem;
  background: var(--panel-raised);
  border-bottom: 1px solid var(--panel-border);
}

.terminal-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--panel-border);
  flex-shrink: 0;
}

.terminal-bar .terminal-dot:nth-child(3) {
  background: var(--teal-dim);
}

.terminal-path {
  margin-left: auto;
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.terminal-body {
  margin: 0;
  padding: 1rem 0.85rem 1.15rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.85;
  color: var(--text);
  overflow-x: auto;
  tab-size: 2;
}

.terminal-body code {
  font: inherit;
  display: block;
  min-width: max-content;
}

/* Each output line carries a 2ch gutter so the status dot can sit
   outside the key column without breaking monospace alignment. */
.t-line {
  display: block;
  position: relative;
  padding-left: 2ch;
  white-space: pre;
}

.t-prompt {
  color: var(--teal);
}

.t-cmd {
  color: var(--text);
}

.t-key {
  color: var(--text-muted);
}

.t-val {
  color: var(--teal);
}

.t-comment {
  color: var(--text-muted);
}

/* Status dot — teal, with a slow pulse halo. Absolute, so it occupies the
   gutter without shifting the key that follows it. */
.t-dot {
  position: absolute;
  left: 0;
  color: var(--teal);
}

.t-dot::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 0.55em;
  height: 0.55em;
  margin: -0.275em 0 0 -0.275em;
  border-radius: 50%;
  background: var(--teal);
  animation: dot-pulse 2.4s var(--ease-out) infinite;
}

@keyframes dot-pulse {
  0% {
    transform: scale(1);
    opacity: 0.55;
  }
  70%,
  100% {
    transform: scale(2.6);
    opacity: 0;
  }
}

/* Blinking cursor */
.t-cursor {
  display: inline-block;
  width: 0.55em;
  height: 1em;
  vertical-align: text-bottom;
  background: var(--teal);
  animation: cursor-blink 1.15s steps(2, start) infinite;
}

@keyframes cursor-blink {
  to {
    visibility: hidden;
  }
}

@media (prefers-reduced-motion: reduce) {
  .t-dot::after {
    animation: none;
    opacity: 0.35;
    transform: scale(1);
  }
  .t-cursor {
    animation: none;
  }
}

/* ── Section headers, written as shell comments ── */
.section-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-label);
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.section-label::before {
  content: "# ";
  color: var(--teal-dim);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 6vw, 2.5rem);
  color: var(--text);
  margin-bottom: 1.5rem;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--hairline);
  margin-block: 0;
}

/* ── Layout shells ── */
main {
  position: relative;
  z-index: 1;
}

/* Scoped to direct children of <main> on purpose: a bare `section` selector
   also catches sections nested inside a page section (the About blocks), which
   then inherit full page padding. */
main > section,
main > .section-divider,
.page-header,
.blog-wrap,
.article-hero,
.article-body {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  box-sizing: border-box;
  padding-inline: var(--space-page-x);
}

main > section {
  padding-block: var(--space-section);
}

/* Anchor offset for the fixed nav */
[id] {
  scroll-margin-top: calc(var(--nav-height) + 1rem);
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--hairline);
  padding: 1.5rem var(--space-page-x);
  padding-bottom: max(1.5rem, env(safe-area-inset-bottom, 0px) + 1rem);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: center;
  text-align: center;
  position: relative;
  z-index: 1;
}

.footer-copy,
.footer-tagline {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.footer-tagline span {
  color: var(--teal);
}

/* ── Reveal on scroll ── */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--duration-normal) var(--ease-out),
    transform var(--duration-normal) var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ── Tablet (640px+) ── */
@media (min-width: 40rem) {
  .nav-logo {
    font-size: 0.9rem;
  }

  .terminal-body {
    font-size: 0.85rem;
    padding: 1.25rem 1.25rem 1.4rem;
  }

  .btn-primary,
  .btn-secondary {
    font-size: var(--text-sm);
    padding: 0.8rem 1.5rem;
  }

  footer {
    padding: 2rem var(--space-page-x);
    gap: 0.75rem;
  }
}

/* ── Desktop (900px+) ── */
@media (min-width: 56.25rem) {
  nav {
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    flex-wrap: nowrap;
    padding: 0.75rem var(--space-page-x);
    gap: 2rem;
  }

  .nav-logo {
    justify-self: start;
    font-size: 0.95rem;
  }

  .nav-controls {
    order: unset;
    grid-column: 3;
    justify-self: end;
    gap: 1rem;
  }

  .nav-menu-btn {
    display: none;
  }

  .nav-panel {
    order: unset;
    flex: unset;
    width: auto;
    max-height: none;
    overflow: visible;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    align-self: center;
    background: none;
    border: none;
    padding: 0;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
  }

  .nav-panel .nav-links {
    flex-direction: row;
    gap: 1.4rem;
    width: auto;
  }

  .nav-panel .nav-links a {
    min-height: auto;
    padding: 0;
    font-size: 0.875rem;
    border-bottom: none;
  }

  .terminal-body {
    font-size: 0.9rem;
  }

  footer {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    text-align: left;
  }

  .reveal {
    transition-duration: 420ms;
  }
}