/* Zenella site styles.
   Palette follows the logo: blue-black ground, teal and violet accents. */

:root {
  --bg:        #171a22;
  --bg-alt:    #1c202a;
  --surface:   #222735;
  --border:    #323849;
  --ink:       #e8e6df;
  --ink-dim:   #a0a6b5;
  --teal:      #6fd6c6;
  --violet:    #b895e8;
  --code-ink:  #9fe3d8;
  --code-bg:   #12151c;

  --c-header:  #b895e8;
  --c-crypto:  #6c7fd8;
  --c-meta:    #e0b45a;
  --c-regs:    #6fd6c6;
  --c-ucode:   #7ddc8f;
  --c-pad:     #5b6172;

  --sans: "IBM Plex Sans", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", "SF Mono", Menlo, Consolas, monospace;

  --measure: 62ch;
  --gutter: 1.5rem;
}

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

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--teal); text-decoration: underline; text-decoration-color: rgba(111,214,198,0.4); text-underline-offset: 2px; }
a:hover { text-decoration-color: var(--teal); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--violet); outline-offset: 3px; }

code {
  font-family: var(--mono);
  font-size: 0.88em;
  color: var(--code-ink);
  background: var(--code-bg);
  padding: 0.08em 0.35em;
  border-radius: 3px;
}

h1, h2, h3 { font-weight: 600; line-height: 1.2; letter-spacing: -0.01em; }
h2 { font-size: 1.85rem; margin-bottom: 1rem; }
h3 { font-size: 1.1rem; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: 4.5rem 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.lead { max-width: var(--measure); color: var(--ink-dim); margin-bottom: 2.25rem; font-size: 1.05rem; }
.sub-heading { margin: 3rem 0 1rem; font-size: 1.25rem; }
strong { font-weight: 600; }

/* Nav */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(23,26,34,0.94);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.nav-logo-img { height: 30px; width: auto; }
nav ul { display: flex; gap: 1.6rem; list-style: none; }
nav ul a { color: var(--ink-dim); text-decoration: none; font-size: 0.92rem; }
nav ul a:hover, nav ul a.current { color: var(--ink); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); border-radius: 1px; transition: transform 0.2s, opacity 0.2s; }
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
body.menu-open { overflow: hidden; }

/* Hero */
.hero {
  padding: 4.5rem 0 3.5rem;
  background:
    radial-gradient(60% 55% at 18% 40%, rgba(184,149,232,0.14), transparent 70%),
    radial-gradient(40% 45% at 30% 70%, rgba(111,214,198,0.10), transparent 70%);
}
.hero-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 3rem;
  align-items: center;
}
.hero-logo { width: 100%; max-width: 260px; height: auto; display: block; justify-self: center; }
.hero h1 { font-size: 3.2rem; font-weight: 700; margin-bottom: 0.4rem; }
.hero-sub { font-size: 1.35rem; color: var(--ink); margin-bottom: 1rem; max-width: 30ch; line-height: 1.3; }
.hero-body { color: var(--ink-dim); max-width: var(--measure); margin-bottom: 1.6rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-bottom: 1.75rem; }

.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  background: var(--teal);
  color: #10231f;
  border: 1px solid var(--teal);
}
.btn:hover { background: #8ae0d2; text-decoration: none; }
.btn-quiet { background: transparent; color: var(--ink); border-color: var(--border); }
.btn-quiet:hover { background: var(--surface); border-color: var(--ink-dim); }

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  max-width: var(--measure);
}
.hero-facts dt { color: var(--ink-dim); }
.hero-facts dd { font-family: var(--mono); font-size: 0.85rem; }

/* Overview */
.two-col { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 3rem; align-items: start; }
.prose p { max-width: var(--measure); margin-bottom: 1rem; color: var(--ink-dim); }
.prose p:last-child { margin-bottom: 0; }
.gen-list { list-style: none; border-top: 1px solid var(--border); }
.gen-list li { padding: 1.1rem 0; border-bottom: 1px solid var(--border); }
.gen-list h3 { margin-bottom: 0.3rem; color: var(--teal); }
.gen-list p { color: var(--ink-dim); font-size: 0.95rem; }

/* Byte map */
.layout-wrapper { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 2rem; align-items: start; }
.bytemap { list-style: none; display: flex; flex-direction: column; gap: 2px; position: sticky; top: 74px; }
.seg {
  --h: 32;
  height: clamp(34px, calc(var(--h) * 0.03px), 340px);
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 0.6rem;
  align-content: center;
  padding: 0.25rem 0.7rem;
  border-left: 3px solid var(--seg-color, var(--border));
  background: color-mix(in srgb, var(--seg-color, var(--border)) 13%, transparent);
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.3;
  border-radius: 0 3px 3px 0;
}
.seg-addr { grid-row: 1 / 3; color: var(--seg-color, var(--ink-dim)); align-self: center; }
.seg-label { color: var(--ink); font-weight: 500; }
.seg-size { color: var(--ink-dim); font-size: 0.72rem; }
.seg-header { --seg-color: var(--c-header); }
.seg-crypto { --seg-color: var(--c-crypto); }
.seg-meta   { --seg-color: var(--c-meta); }
.seg-regs   { --seg-color: var(--c-regs); }
.seg-ucode  { --seg-color: var(--c-ucode); }
.seg-pad    { --seg-color: var(--c-pad); }

/* Layout tables */
.layout-table-wrap { min-width: 0; }
.scroll-x { overflow-x: auto; -webkit-overflow-scrolling: touch; min-width: 0; }
.layout-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.layout-table th {
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--ink-dim);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--ink);
  white-space: nowrap;
}
.layout-table td { padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--border); vertical-align: top; }
.layout-table td:nth-child(3) { font-family: var(--mono); font-size: 0.85rem; white-space: nowrap; }
.layout-table td:nth-child(1) { white-space: nowrap; }
.layout-table td:last-child { color: var(--ink-dim); min-width: 11rem; }
.layout-table.compact td:last-child { min-width: 12rem; }
.row-header td:first-child { box-shadow: inset 3px 0 0 var(--c-header); }
.row-crypto td:first-child { box-shadow: inset 3px 0 0 var(--c-crypto); }
.row-meta   td:first-child { box-shadow: inset 3px 0 0 var(--c-meta); }
.row-regs   td:first-child { box-shadow: inset 3px 0 0 var(--c-regs); }
.row-ucode  td:first-child { box-shadow: inset 3px 0 0 var(--c-ucode); }
.row-pad    td:first-child { box-shadow: inset 3px 0 0 var(--c-pad); }
.table-note { margin-top: 1rem; font-size: 0.9rem; color: var(--ink-dim); max-width: var(--measure); }

/* Commands */
.cmd-groups { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.25rem; margin-bottom: 2.5rem; }
.cmd-group { background: var(--surface); border: 1px solid var(--border); border-radius: 6px; padding: 1.4rem 1.5rem; min-width: 0; }
.cmd-group h3 { font-family: var(--mono); font-size: 0.95rem; font-weight: 500; color: var(--teal); margin-bottom: 0.25rem; overflow-wrap: anywhere; }
.cmd-group h3 + h3 { margin-top: 0.1rem; }
.cmd-group h3 + p, .cmd-group h3 + h3 + p { margin-top: 0.6rem; }
.cmd-group p { color: var(--ink-dim); font-size: 0.95rem; }
.cmd-group-main { border-color: var(--teal); grid-column: 1 / -1; }
.cmd-group-exp, .cmd-group-wide { grid-column: 1 / -1; }
.cmd-group-exp h3 { color: var(--violet); }
.cmd-group ul { margin-top: 0.8rem; padding-left: 1.2rem; color: var(--ink-dim); font-size: 0.92rem; }
.cmd-group li { margin-bottom: 0.35rem; }
.cmd-group li strong { color: var(--ink); font-weight: 500; }

figcaption { font-size: 0.85rem; color: var(--ink-dim); margin-top: 0.6rem; }

.code-block { background: var(--code-bg); border: 1px solid var(--border); border-radius: 6px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.code-block pre { padding: 0.9rem 1.1rem; font-family: var(--mono); font-size: 0.83rem; line-height: 1.65; color: var(--ink); white-space: pre; }
.comment { color: var(--ink-dim); }

/* Types */
.types-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1.25rem; align-items: start; }
@media (min-width: 700px) {
  .types-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
.type-card { background: var(--surface); border: 1px solid var(--border); border-radius: 6px; padding: 1.3rem 1.4rem; min-width: 0; }
.type-card h3 { font-family: var(--mono); font-size: 0.92rem; font-weight: 500; display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.3rem 0.7rem; margin-bottom: 0.6rem; }
.type-card h3 code { background: none; padding: 0; color: var(--violet); font-size: 1em; }
.type-card h3.stacked { margin-top: 1.2rem; }
.type-size { font-family: var(--sans); font-size: 0.8rem; color: var(--ink-dim); font-weight: 400; }
.type-table { width: 100%; table-layout: auto; border-collapse: collapse; font-family: var(--mono); font-size: 0.82rem; }
.type-table td, .type-table th { padding: 0.28rem 0.4rem; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; overflow-wrap: break-word; }
.type-table th { font-family: var(--sans); font-weight: 600; font-size: 0.8rem; color: var(--ink-dim); }
.type-table td:first-child { color: var(--ink-dim); white-space: nowrap; width: 1%; padding-right: 1.75rem; }
.type-table code { background: none; padding: 0; color: inherit; font-size: 1em; }
.type-table td:last-child code { color: var(--ink); }
.enum-table td:first-child { color: var(--c-meta); }
.enum-table .col-val { width: 5.6em; }
.enum-table th[colspan] { padding-top: 0.6rem; color: var(--ink); }
.type-card-opcodes { grid-column: 1 / -1; }
.enum-columns { display: grid; grid-template-columns: minmax(0, 1fr); gap: 0 1.5rem; align-items: start; }
@media (min-width: 700px) and (max-width: 1099px) {
  .enum-columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .enum-b { grid-column: 2; grid-row: 1 / span 2; }
  .enum-c { grid-column: 1; }
}
@media (min-width: 1100px) {
  .enum-columns { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.type-note { margin-top: 0.8rem; font-size: 0.85rem; color: var(--ink-dim); }

/* Install */
.steps { list-style: none; counter-reset: step; margin-bottom: 2rem; max-width: 760px; }
.step { counter-increment: step; position: relative; padding: 0 0 1.75rem 3rem; }
.step::before {
  content: counter(step);
  position: absolute; left: 0; top: 0.05rem;
  width: 2rem; height: 2rem;
  border-radius: 50%;
  border: 1px solid var(--teal);
  color: var(--teal);
  font-family: var(--mono);
  font-size: 0.9rem;
  display: flex; align-items: center; justify-content: center;
}
.step:not(:last-child)::after { content: ""; position: absolute; left: 1rem; top: 2.4rem; bottom: 0.3rem; width: 1px; background: var(--border); }
.step h3 { margin-bottom: 0.35rem; }
.step p { color: var(--ink-dim); margin-bottom: 0.75rem; max-width: var(--measure); }
.step .code-block { max-width: 100%; }

.req-box { border: 1px solid var(--border); border-left: 3px solid var(--violet); border-radius: 0 6px 6px 0; padding: 1.1rem 1.4rem; max-width: 760px; }
.req-box h3 { margin-bottom: 0.5rem; font-size: 1rem; }
.req-box ul { padding-left: 1.2rem; color: var(--ink-dim); font-size: 0.95rem; }
.req-box li { margin-bottom: 0.25rem; }

/* Workflow */
.workflow-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 3rem; align-items: start; margin-bottom: 2rem; }
.wsteps { list-style: none; counter-reset: w; }
.wsteps li { counter-increment: w; display: grid; grid-template-columns: 2rem 1fr; gap: 0.6rem; padding: 0.9rem 0; border-bottom: 1px solid var(--border); }
.wsteps li::before { content: counter(w); grid-column: 1; grid-row: 1 / span 2; font-family: var(--mono); color: var(--violet); padding-top: 0.15rem; }
.wsteps h3, .wsteps p { grid-column: 2; }
.wsteps h3 { font-size: 1rem; margin-bottom: 0.25rem; }
.wsteps p { color: var(--ink-dim); font-size: 0.95rem; }
.workflow-video { margin: 0; }
.workflow-video video { width: 100%; aspect-ratio: 3832 / 2066; object-fit: contain; display: block; border: 1px solid var(--border); border-radius: 6px; background: #000; }
.note { border-left: 3px solid var(--c-meta); padding: 0.2rem 0 0.2rem 1rem; color: var(--ink-dim); font-size: 0.95rem; max-width: 760px; }

/* Footer */
footer { border-top: 1px solid var(--border); padding: 2rem 0; font-size: 0.9rem; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.footer-meta { color: var(--ink-dim); }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { color: var(--ink-dim); }

/* Responsive */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 200px 1fr; gap: 2rem; }
  .two-col { grid-template-columns: 1fr; gap: 2rem; }
  .layout-wrapper { grid-template-columns: 1fr; }
  .bytemap { position: static; }
  .seg { height: auto; min-height: 2.6rem; }
  .workflow-grid { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  nav ul {
    display: none;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 58px; left: 0; right: 0;
    background: rgba(23,26,34,0.98);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem var(--gutter) 0.75rem;
  }
  nav ul.open { display: flex; }
  nav ul li { border-bottom: 1px solid var(--border); }
  nav ul li:last-child { border-bottom: none; }
  nav ul a { display: block; padding: 0.8rem 0; font-size: 1rem; }

  .hero { padding: 3rem 0 2.5rem; }
  .hero-inner { grid-template-columns: 1fr; gap: 1.5rem; text-align: left; }
  .hero-logo { max-width: 150px; justify-self: start; }
  .hero h1 { font-size: 2.5rem; }
  .hero-sub { font-size: 1.15rem; }

  .section { padding: 3.25rem 0; }
  h2 { font-size: 1.6rem; }

  .layout-wrapper { grid-template-columns: 1fr; }
  .bytemap { position: static; }
  .seg { height: auto; min-height: 2.6rem; }

  .cmd-groups { grid-template-columns: 1fr; }
  .types-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  :root { --gutter: 1rem; }
  .hero h1 { font-size: 2.2rem; }
  .btn { width: 100%; text-align: center; }
  .hero-facts { gap: 0.5rem 1.25rem; }
  .step { padding-left: 2.6rem; }
  .type-table { font-size: 0.78rem; }
  .code-block pre { white-space: pre-wrap; overflow-wrap: anywhere; }
  .enum-table .col-val { width: 4.8em; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}