/* Works — bitácora de sesión
   Paleta OKLCH, tipografía fluida por viewport (página única, sin componentes
   reutilizados en contenedores variables), layout algorítmico (grid auto-fit). */

:root {
  --paper: oklch(97% 0.004 250);
  --paper-raised: oklch(99% 0.002 250);
  --ink: oklch(22% 0.02 260);
  --muted: oklch(46% 0.02 260);
  --line: oklch(89% 0.006 260);
  --accent: oklch(58% 0.13 55);
  --accent-ink: oklch(30% 0.1 55);
  --accent-soft: oklch(92% 0.045 60);
  --shadow: oklch(22% 0.02 260 / 0.08);

  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  --step-hero: clamp(2.15rem, 1.55rem + 2.6vw, 3.8rem);
  --step-h2: clamp(1.35rem, 1.15rem + 0.9vw, 1.9rem);
  --step-h3: clamp(1.05rem, 0.98rem + 0.35vw, 1.2rem);
  --step-lede: clamp(1.05rem, 0.97rem + 0.4vw, 1.25rem);
  --step-body: clamp(0.95rem, 0.92rem + 0.15vw, 1rem);

  --space-section: clamp(3.5rem, 2.8rem + 3vw, 7rem);
  --radius: 14px;

  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: oklch(19% 0.014 260);
    --paper-raised: oklch(23% 0.016 260);
    --ink: oklch(94% 0.006 260);
    --muted: oklch(68% 0.02 260);
    --line: oklch(31% 0.016 260);
    --accent: oklch(70% 0.13 58);
    --accent-ink: oklch(90% 0.06 58);
    --accent-soft: oklch(30% 0.05 58);
    --shadow: oklch(0% 0 0 / 0.35);
    color-scheme: dark;
  }
}

html[data-theme="light"] {
  --paper: oklch(97% 0.004 250);
  --paper-raised: oklch(99% 0.002 250);
  --ink: oklch(22% 0.02 260);
  --muted: oklch(46% 0.02 260);
  --line: oklch(89% 0.006 260);
  --accent: oklch(58% 0.13 55);
  --accent-ink: oklch(30% 0.1 55);
  --accent-soft: oklch(92% 0.045 60);
  --shadow: oklch(22% 0.02 260 / 0.08);
  color-scheme: light;
}

html[data-theme="dark"] {
  --paper: oklch(19% 0.014 260);
  --paper-raised: oklch(23% 0.016 260);
  --ink: oklch(94% 0.006 260);
  --muted: oklch(68% 0.02 260);
  --line: oklch(31% 0.016 260);
  --accent: oklch(70% 0.13 58);
  --accent-ink: oklch(90% 0.06 58);
  --accent-soft: oklch(30% 0.05 58);
  --shadow: oklch(0% 0 0 / 0.35);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--step-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background-color 200ms ease, color 200ms ease;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6rem 1rem;
  border-radius: 8px;
  transition: top 150ms ease;
  z-index: 100;
}
.skip-link:focus {
  top: 1rem;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Layout: columna centrada, ancho fluido controlado por min() — el navegador
   decide cuánto respiro dar según viewport, sin breakpoints codificados. */
.site-header,
main > section,
.site-footer {
  padding-inline: max(1.25rem, calc((100vw - 760px) / 2));
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.25rem;
}

.brand {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.brand-dot { color: var(--accent); }

/* Toggle de tema: metáfora de interruptor físico */
.theme-toggle {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}
.theme-toggle-track {
  display: block;
  width: 42px;
  height: 24px;
  border-radius: 999px;
  background: var(--line);
  position: relative;
  transition: background-color 200ms ease;
}
.theme-toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--paper-raised);
  box-shadow: 0 1px 2px var(--shadow);
  transition: transform 250ms cubic-bezier(0.34, 1.56, 0.64, 1);
}
html[data-theme="dark"] .theme-toggle-thumb {
  transform: translateX(18px);
}

.hero {
  padding-top: clamp(2.5rem, 1.5rem + 4vw, 5rem);
  padding-bottom: var(--space-section);
  max-width: 760px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-ink);
  margin: 0 0 1rem;
}

.hero h1 {
  font-size: var(--step-hero);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 1.25rem;
}

.lede {
  font-size: var(--step-lede);
  color: var(--muted);
  max-width: 46ch;
  margin: 0 0 1.75rem;
}

.status-line {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 var(--accent-soft); }
  50% { opacity: 0.65; box-shadow: 0 0 0 4px transparent; }
}

/* Terminal: elemento firma de la pieza */
.terminal-section {
  padding-bottom: var(--space-section);
}

.terminal {
  max-width: 760px;
  border-radius: var(--radius);
  background: var(--paper-raised);
  border: 1px solid var(--line);
  box-shadow: 0 12px 30px -18px var(--shadow);
  overflow: hidden;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--line);
}

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

.terminal-path {
  margin-left: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.terminal-body {
  margin: 0;
  padding: 1.25rem 1.25rem 1.5rem;
  font-family: var(--font-mono);
  font-size: clamp(0.8rem, 0.76rem + 0.2vw, 0.92rem);
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 11.5em;
}

.terminal-body .cmd { color: var(--accent-ink); }
.terminal-body .out { color: var(--muted); }

.cursor {
  display: inline-block;
  width: 0.55em;
  height: 1em;
  background: var(--accent);
  vertical-align: text-bottom;
  animation: blink 1s steps(1) infinite;
}
@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

h2 {
  font-size: var(--step-h2);
  letter-spacing: -0.01em;
  margin: 0 0 1.75rem;
}

.principles {
  padding-bottom: var(--space-section);
}

/* Grid algorítmico: el navegador decide cuántas columnas caben, sin
   breakpoints escritos a mano. */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1.25rem;
}

.card {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper-raised);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.card:hover, .card:focus-within {
  transform: translateY(-3px);
  box-shadow: 0 14px 28px -20px var(--shadow);
}

.card-index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

.card h3 {
  font-size: var(--step-h3);
  margin: 0 0 0.5rem;
}

.card p {
  color: var(--muted);
  margin: 0;
}

.stack {
  padding-bottom: var(--space-section);
}

.manifest {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.manifest li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--line);
}

.manifest-name {
  font-family: var(--font-mono);
  color: var(--ink);
  min-width: 9ch;
}
.manifest-name::before {
  content: "› ";
  color: var(--accent);
}

.manifest-desc {
  color: var(--muted);
  flex: 1 1 28ch;
}

code {
  font-family: var(--font-mono);
  background: var(--accent-soft);
  color: var(--accent-ink);
  padding: 0.1em 0.4em;
  border-radius: 5px;
  font-size: 0.9em;
}

a { color: var(--accent-ink); }

.site-footer {
  padding-top: 2rem;
  padding-bottom: 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  max-width: 760px;
}
.site-footer p { margin: 0 0 0.5rem; }
.footer-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 400ms ease, transform 400ms ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}