/* ── PULSE V2.1 — base.css · "ION ATMOSPHERE" ── */

/* ── 1. Fonts — self-hosted, font-display swap. Instrument Sans is a variable ── */
@font-face {
  font-family: "Instrument Sans";
  src: url("/fonts/instrument-sans-latin.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Instrument Sans";
  src: url("/fonts/instrument-sans-latin-ext.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF,
    U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Space Mono";
  src: url("/fonts/space-mono-latin.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Space Mono";
  src: url("/fonts/space-mono-latin-ext.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF,
    U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Space Mono";
  src: url("/fonts/space-mono-700-latin.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA,
    U+02DC, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: "Space Mono";
  src: url("/fonts/space-mono-700-latin-ext.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF,
    U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* ── 2. Reset + document defaults ── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
}

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem; /* sticky header clearance for anchor jumps */
  -webkit-text-size-adjust: 100%;
}
/* Theme switch — theme.js sets data-theme before first paint; all colors */
html[data-theme="light"] { color-scheme: light; }

body {
  min-height: 100vh;
  background: var(--canvas);
  color: var(--text-2);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
}

/* Grain film — single static SVG-noise tile, no blur, no animation. */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: var(--z-grain);
  pointer-events: none;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

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

h1, h2, h3, h4 {
  color: var(--text-1);
  font-weight: 650;
  line-height: var(--lh-heading);
  letter-spacing: var(--track-tight);
  text-wrap: balance;
}
h1 { font-size: var(--fs-h1); letter-spacing: var(--track-display); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); }

p { max-width: 68ch; }

a {
  color: var(--text-1);
  text-decoration: underline;
  text-decoration-color: var(--line-3);
  text-underline-offset: 3px;
  transition: color var(--dur-1) ease, text-decoration-color var(--dur-1) ease;
}
a:hover { text-decoration-color: var(--accent); }

code,
kbd,
pre {
  font-family: var(--font-mono);
  font-size: 0.875em;
}

::selection {
  background: var(--accent-tint-1);
  color: var(--text-1);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}
:focus:not(:focus-visible) { outline: none; }

/* ── 3. Layout primitives ── */
.container {
  width: min(100% - 2 * var(--gutter), var(--container-max));
  margin-inline: auto;
}
.container-wide  { width: min(100% - 2 * var(--gutter), var(--container-wide)); margin-inline: auto; }
.container-prose { width: min(100% - 2 * var(--gutter), var(--container-prose)); margin-inline: auto; }

/* Asymmetric editorial splits — alternate 7/5 and 5/7 down the page */
.split {
  display: grid;
  gap: var(--sp-7);
  align-items: center;
}
@media (min-width: 56em) {
  .split-7-5 { grid-template-columns: 7fr 5fr; }
  .split-5-7 { grid-template-columns: 5fr 7fr; }
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: var(--sp-3);
  inset-inline-start: var(--sp-3);
  z-index: var(--z-skip);
  padding: var(--sp-2) var(--sp-4);
  background: var(--surface-2);
  color: var(--text-1);
  border: 1px solid var(--accent);
  border-radius: var(--radius-sm);
  font-size: var(--fs-body-sm);
  text-decoration: none;
  transform: translateY(-200%);
}
.skip-link:focus-visible { transform: none; }

/* ── 4. Section primitives ── */
.section {
  position: relative;
  padding-block: var(--sp-section);
}
.section-tight { padding-block: var(--sp-9); }

/* Oversized faint section numeral — Space Mono, ghost ink */
.section-num {
  display: block;
  font: 700 clamp(3.5rem, 7vw, 6rem) / 1 var(--font-mono);
  color: var(--text-ghost);
  user-select: none;
  margin-bottom: var(--sp-4);
}

/* Hairline rule that bleeds past the container edge */
.rule-bleed {
  border: 0;
  height: 1px;
  background: var(--line-1);
  width: 100vw;
  margin-inline: calc(50% - 50vw);
}

/* Standard section head: kicker + title + sub */
.section-head { margin-bottom: var(--sp-7); }
.section-head > h2 { margin-top: var(--sp-4); }
.section-sub {
  margin-top: var(--sp-4);
  color: var(--text-3);
  font-size: var(--fs-lead);
  max-width: 56ch;
}

/* Kicker — THE one eyebrow system (mono micro-label with leading tick). */
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font: 700 var(--fs-micro) / 1 var(--font-mono);
  letter-spacing: var(--track-micro);
  text-transform: uppercase;
  color: var(--text-3);
}
.kicker::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--line-3);
}

/* Live dot — budget: MAX ONE per page */
.live-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-line);
}
html.anim .live-dot { animation: live-pulse 2.4s ease-in-out infinite; }
@keyframes live-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* Mono utilities */
.mono-label {
  font: 700 var(--fs-micro) / 1.5 var(--font-mono);
  letter-spacing: var(--track-micro);
  text-transform: uppercase;
  color: var(--text-3);
}
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.accent { color: var(--accent-bright); }

/* Trust strip — reusable meta row. v2.1: sentence case (caps-density diet — */
.trust-strip {
  font: 400 var(--fs-body-sm) / 1.8 var(--font-mono);
  letter-spacing: 0.01em;
  color: var(--text-3);
}

/* HUD corner brackets — 4 registration ticks, pure CSS, zero extra markup */
.hud-corners {
  --hud: var(--line-3);
  background-image:
    linear-gradient(var(--hud), var(--hud)), linear-gradient(var(--hud), var(--hud)),
    linear-gradient(var(--hud), var(--hud)), linear-gradient(var(--hud), var(--hud)),
    linear-gradient(var(--hud), var(--hud)), linear-gradient(var(--hud), var(--hud)),
    linear-gradient(var(--hud), var(--hud)), linear-gradient(var(--hud), var(--hud));
  background-repeat: no-repeat;
  background-size:
    12px 1px, 1px 12px,
    12px 1px, 1px 12px,
    12px 1px, 1px 12px,
    12px 1px, 1px 12px;
  background-position:
    0 0, 0 0,
    100% 0, 100% 0,
    0 100%, 0 100%,
    100% 100%, 100% 100%;
}
.hud-corners:hover { --hud: var(--accent-line); }

/* ── 5. Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font: 600 1rem / 1.2 var(--font-sans);
  letter-spacing: -0.01em;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform var(--dur-1) var(--ease-glide),
    box-shadow var(--dur-2) ease,
    background-color var(--dur-1) ease,
    border-color var(--dur-1) ease,
    color var(--dur-1) ease;
}
.btn:active { transform: translateY(1px); }

/* Primary CTA — accent fill, glow bloom on hover */
.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}
.btn-primary:hover {
  box-shadow: var(--glow-accent), var(--glow-accent-lg);
  transform: translateY(-1px);
}

/* Ghost — hairline border, brightens on hover */
.btn-ghost {
  background: transparent;
  border-color: var(--line-2);
  color: var(--text-1);
}
.btn-ghost:hover {
  border-color: var(--line-3);
  background: var(--wash-1);
}

.btn-lg { padding: 1rem 2.1rem; font-size: 1.0625rem; }
.btn-sm { padding: 0.55rem 1.1rem; font-size: var(--fs-body-sm); }

/* ── 6. Cards ── */
.card {
  /* background-color, NOT the shorthand — the shorthand resets */
  background-color: var(--surface-1);
  border: 1px solid var(--line-1);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  transition: border-color var(--dur-2) ease, background-color var(--dur-2) ease;
}
.card:hover { border-color: var(--line-2); }

.card-title { font-size: var(--fs-h4); margin-bottom: var(--sp-3); }
.card-body  { color: var(--text-3); font-size: var(--fs-body-sm); }

/* ── 7. FAQ accordion — native <details>/<summary>: keyboard + no-JS safe ── */
.faq-item { border-top: 1px solid var(--line-1); }
.faq-item:last-child { border-bottom: 1px solid var(--line-1); }
.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  padding: var(--sp-4) var(--sp-1);
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  color: var(--text-1);
}
.faq-q::-webkit-details-marker { display: none; }
.faq-q::after {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  margin-inline-end: 4px;
  border-right: 1.5px solid var(--text-3);
  border-bottom: 1.5px solid var(--text-3);
  transform: rotate(45deg);
  transition: transform var(--dur-2) var(--ease-glide), border-color var(--dur-1) ease;
}
.faq-item[open] > .faq-q::after { transform: rotate(225deg); border-color: var(--text-1); }
.faq-a {
  padding: 0 var(--sp-1) var(--sp-5);
  color: var(--text-2);
}
.faq-a p { max-width: 65ch; }

/* ── 8. Shell — nav header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  border-bottom: 1px solid transparent;
  transition: background-color var(--dur-2) ease, border-color var(--dur-2) ease;
}
.site-header.is-scrolled {
  background: var(--veil-92);
  border-bottom-color: var(--line-1);
}
@supports (backdrop-filter: blur(12px)) {
  .site-header.is-scrolled {
    background: var(--veil-78);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }
}

/* v2.2 shell: logo left · NAV LINKS TRUE-CENTERED (absolute, balanced */
.site-nav {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  min-height: 4rem;
}
/* The shell rides a wider column than page content: the auth cluster + */
.site-nav.container {
  width: min(100% - 2 * var(--gutter), var(--container-wide));
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
}
.nav-logo img { display: block; width: 28px; height: 28px; }
.nav-wordmark {
  font: 700 0.875rem / 1 var(--font-mono);
  letter-spacing: 0.18em;
  color: var(--text-1);
}

.nav-menu {
  display: flex;
  align-items: center;
  margin-inline-start: auto;
}
.nav-links {
  display: flex;
  gap: var(--sp-5);
  list-style: none;
  padding: 0;
}
@media (min-width: 64em) {
  /* absolute center: balanced no matter how wide logo / tools are */
  .nav-links {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
  }

  /* Overlap-guard fallback (class set by motion.js when the measured */
  .site-header.nav-tight .nav-links {
    position: static;
    transform: none;
    gap: var(--sp-4);
  }
  .site-header.nav-tight .nav-menu {
    flex: 1;
    justify-content: space-between;
    gap: var(--sp-4);
  }
}
.nav-links a {
  position: relative;
  display: inline-block;
  padding: 0.35rem 0.1rem;
  font-size: var(--fs-body-sm);
  color: var(--text-2);
  text-decoration: none;
  transition: color var(--dur-1) ease;
}
/* Underline-grow hover + persistent aria-current marker — one quiet
   system instead of bare color shifts (premium-nav pass). */
.nav-links a::after {
  content: "";
  position: absolute;
  inset-inline: 0.1rem;
  bottom: 0;
  height: 1.5px;
  border-radius: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: 50% 50%;
  transition: transform var(--dur-2) var(--ease-glide), opacity var(--dur-1) ease;
  opacity: 0.85;
}
.nav-links a:hover { color: var(--text-1); }
.nav-links a:hover::after { transform: scaleX(1); }
.nav-links a[aria-current="page"] { color: var(--text-1); }
.nav-links a[aria-current="page"]::after { transform: scaleX(1); opacity: 1; }

/* Right cluster: language select + theme toggle + CTA */
.nav-tools {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}
.lang-select {
  max-width: 9.5rem;
  height: 36px;
  padding: 0.45rem 0.55rem;
  background-color: transparent;
  color: var(--text-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  font: 500 var(--fs-body-sm) / 1.2 var(--font-sans);
  cursor: pointer;
  transition: border-color var(--dur-1) ease, color var(--dur-1) ease;
}
.lang-select:hover { border-color: var(--line-3); color: var(--text-1); }
.lang-select option { background: var(--surface-2); color: var(--text-1); }
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 36px;
  height: 36px;
  padding: 0;
  background: none;
  color: var(--text-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--dur-1) ease, color var(--dur-1) ease,
    background-color var(--dur-1) ease;
}
.theme-toggle:hover {
  border-color: var(--line-3);
  color: var(--text-1);
  background-color: var(--wash-1);
}
.theme-toggle svg { display: block; }
/* Icon mirrors the CURRENT theme's escape hatch: sun offered in dark, */
html[data-theme="light"] .theme-toggle .icon-sun { display: none; }
html:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
/* No JS → no data-theme → the theme toggle is inert; hide it. The native */
html:not([data-theme]) .theme-toggle { display: none; }

/* Hairline divider between instrument controls and the account cluster */
.nav-sep {
  flex: none;
  width: 1px;
  height: 1.25rem;
  background: var(--line-2);
}

/* Auth-aware cluster (nav-auth.js contract: #nav-login / #nav-signup / */
.nav-auth-link {
  color: var(--text-2);
  font-size: var(--fs-body-sm);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur-1) ease;
}
.nav-auth-link:hover,
.nav-auth-link:focus-visible { color: var(--text-1); }

/* Sign up — primary-adjacent tier: accent hairline + accent text, */
.nav-signup {
  border-color: var(--accent-line);
  color: var(--accent-bright);
  white-space: nowrap;
}
.nav-signup:hover {
  border-color: var(--accent-line);
  background: var(--accent-tint-2);
}

.nav-user-pill {
  display: none; /* revealed by nav-auth.js when a session exists */
  align-items: center;
  max-width: 11rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--accent-line);
  border-radius: var(--radius-pill);
  background: var(--accent-tint-2);
  color: var(--accent-bright);
  font: 600 var(--fs-body-sm) / 1.2 var(--font-sans);
  text-decoration: none;
}
.nav-user-pill:hover { background: var(--accent-tint-1); }

.nav-cta { white-space: nowrap; }
.nav-cta svg { flex: none; }

/* ── 8b. Custom language menu (langmenu.js enhancement of .lang-select). ── */
.lang-select.is-enhanced { display: none; }

.langmenu { position: relative; flex: none; }

.langmenu-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  max-width: 11rem;
  height: 36px;
  padding: 0.45rem 0.6rem;
  background-color: transparent;
  color: var(--text-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-sm);
  font: 500 var(--fs-body-sm) / 1.2 var(--font-sans);
  cursor: pointer;
  transition: border-color var(--dur-1) ease, color var(--dur-1) ease;
}
.langmenu-btn:hover,
.langmenu-btn[aria-expanded="true"] {
  border-color: var(--line-3);
  color: var(--text-1);
}
.langmenu-btn svg { flex: none; }
.langmenu-caret { transition: transform var(--dur-1) ease; }
.langmenu-btn[aria-expanded="true"] .langmenu-caret { transform: rotate(180deg); }
.langmenu-label {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.langmenu-code {
  display: none;
  font: 700 0.75rem / 1 var(--font-mono);
  letter-spacing: 0.08em;
}
/* Desktop: compact the trigger to globe + mono ISO code — the caret
   goes too (premium-nav pass: globe + chip + caret read busy). */
@media (min-width: 64em) {
  .langmenu-label { display: none; }
  .langmenu-code { display: inline; }
  .langmenu-caret { display: none; }
}

.langmenu-list {
  position: absolute;
  inset-inline-end: 0;
  top: calc(100% + 0.4rem);
  z-index: var(--z-raised);
  min-width: 100%;
  width: max-content;
  max-height: min(21rem, 60vh);
  overflow-y: auto;
  overscroll-behavior: contain;
  margin: 0;
  padding: 0.35rem;
  list-style: none;
  background-color: var(--surface-2);
  border: 1px solid var(--line-2);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2);
}
.langmenu-list[hidden] { display: none; }
@media (prefers-reduced-motion: no-preference) {
  .langmenu-list { animation: langmenu-in var(--dur-2) var(--ease-glide); }
}
@keyframes langmenu-in {
  from { opacity: 0; transform: translateY(-4px); }
}

.langmenu-opt {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-sm);
  color: var(--text-2);
  font: 500 var(--fs-body-sm) / 1.2 var(--font-sans);
  white-space: nowrap;
  cursor: pointer;
}
.langmenu-opt:hover,
.langmenu-opt:focus-visible {
  background: var(--wash-1);
  color: var(--text-1);
}
.langmenu-opt .langmenu-check {
  visibility: hidden;
  color: var(--accent-bright);
}
.langmenu-opt[aria-selected="true"] {
  color: var(--accent-bright);
  background: var(--accent-tint-2);
}
.langmenu-opt[aria-selected="true"] .langmenu-check { visibility: visible; }

.nav-toggle { display: none; }

@media (max-width: 63.99em) {
  .site-header { position: sticky; }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    margin-inline-start: auto;
    padding: 0.6rem 0.65rem;
    background: none;
    border: 1px solid var(--line-1);
    border-radius: var(--radius-sm);
    cursor: pointer;
  }
  .nav-toggle-box {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 18px;
  }
  .nav-toggle-bar {
    display: block;
    height: 2px;
    background: var(--text-1);
    transition: transform var(--dur-2) var(--ease-glide);
  }
  .site-header.nav-open .nav-toggle-bar:first-child { transform: translateY(3.5px) rotate(45deg); }
  .site-header.nav-open .nav-toggle-bar:last-child  { transform: translateY(-3.5px) rotate(-45deg); }

  .nav-menu { display: none; }
  .site-header.nav-open {
    background: var(--canvas);
    border-bottom-color: var(--line-1);
  }
  .site-header.nav-open .nav-menu {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: var(--sp-5);
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: var(--sp-5) var(--gutter) var(--sp-6);
    background: var(--surface-1);
    border-bottom: 1px solid var(--line-1);
    box-shadow: var(--shadow-2);
  }
  /* Drawer: links read as grouped rows — full-width touch targets with
     hairline separators (premium-nav pass). */
  .nav-links { flex-direction: column; gap: 0; }
  .nav-links li + li { border-top: 1px solid var(--line-0, var(--line-1)); }
  .nav-links a {
    display: block;
    padding: 0.7rem 0.15rem;
    font-size: var(--fs-body);
  }
  .nav-links a::after { content: none; }
  .nav-links a[aria-current="page"] {
    color: var(--accent-bright);
  }
  /* Controls row (language + theme), then the account row, then the CTA */
  .nav-tools {
    flex-wrap: wrap;
    gap: var(--sp-3);
    padding-top: var(--sp-4);
    border-top: 1px solid var(--line-1);
  }
  .nav-tools .theme-toggle { width: 44px; height: 44px; }
  .lang-select { flex: 1 1 auto; max-width: none; }

  /* Custom language menu stretches like the select it replaces; the */
  .langmenu { flex: 1 1 60%; }
  .langmenu-btn { width: 100%; max-width: none; height: 44px; }
  .lang-select { height: 44px; }
  .langmenu-caret { margin-inline-start: auto; }
  .langmenu-list { inset-inline: 0; }

  /* Account cluster: Log in + Sign up share a row of equal halves above */
  .nav-sep { display: none; }
  .nav-tools .nav-auth-link,
  .nav-tools .nav-signup {
    flex: 1 1 40%;
    justify-content: center;
    text-align: center;
  }
  .nav-tools .nav-auth-link {
    padding: 0.55rem 1.1rem;
    border: 1px solid var(--line-2);
    border-radius: var(--radius-md);
  }
  .nav-user-pill {
    flex: 1 1 100%;
    max-width: none;
    justify-content: center;
  }
  .nav-tools .nav-cta { flex: 1 1 100%; }
}

/* Tablet band — the drawer collapses the links, but the two actions that
   matter (Sign up + Download) stay in the header row beside the burger.
   When the drawer opens, the absolute panel takes over and shows the
   full grouped menu as usual. */
@media (min-width: 48em) and (max-width: 63.99em) {
  .site-header:not(.nav-open) .nav-menu {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    margin-inline-start: auto;
  }
  .site-header:not(.nav-open) .nav-menu .nav-links,
  .site-header:not(.nav-open) .nav-menu .lang-select,
  .site-header:not(.nav-open) .nav-menu .langmenu,
  .site-header:not(.nav-open) .nav-menu .theme-toggle,
  .site-header:not(.nav-open) .nav-menu .nav-sep,
  .site-header:not(.nav-open) .nav-menu .nav-auth-link { display: none; }
  .site-header:not(.nav-open) .nav-tools {
    flex-wrap: nowrap;
    padding-top: 0;
    border-top: 0;
  }
  .site-header:not(.nav-open) .nav-tools .nav-signup,
  .site-header:not(.nav-open) .nav-tools .nav-cta { flex: none; }
  .site-header:not(.nav-open) .nav-user-pill { flex: none; max-width: 11rem; }
  .nav-toggle { order: 2; margin-inline-start: var(--sp-3); }
}

/* ── 9. Shell — footer ── */
.site-footer {
  margin-top: var(--sp-section);
  border-top: 1px solid var(--line-1);
  padding: var(--sp-8) 0 var(--sp-6);
}
.footer-grid {
  display: grid;
  gap: var(--sp-7);
  grid-template-columns: 1fr;
}
@media (min-width: 45em) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (min-width: 64em) {
  .footer-grid { grid-template-columns: 2.2fr 1fr 1fr 1.2fr 1fr; }
  .footer-brand { grid-column: auto; }
}
.footer-brand .nav-logo { margin-bottom: var(--sp-4); }
.footer-tagline {
  color: var(--text-3);
  font-size: var(--fs-body-sm);
  max-width: 28ch;
}
.footer-version {
  margin-top: var(--sp-4);
  font: 400 var(--fs-micro) / 1.5 var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
}
.footer-version a { color: var(--text-3); }
.footer-version a:hover { color: var(--text-1); }

.footer-head {
  font: 700 var(--fs-micro) / 1 var(--font-mono);
  letter-spacing: var(--track-micro);
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: var(--sp-4);
}
.footer-col ul {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}
.footer-col a {
  color: var(--text-3);
  font-size: var(--fs-body-sm);
  text-decoration: none;
  transition: color var(--dur-1) ease;
}
.footer-col a:hover { color: var(--text-1); }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
  justify-content: space-between;
  align-items: baseline;
  margin-top: var(--sp-7);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--line-1);
  color: var(--text-3);
  font-size: 0.875rem;
}

/* ── 10. TRACE CAPTION — the one-per-page "Illustrative" micro-label that ── */
.trace-caption {
  font: 400 var(--fs-micro) / 1.5 var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-3);
}

/* ── 11. THE TRACE — signature motif (v2.1) A refined oscilloscope waveform:… ── */
.trace-wrap {
  position: relative;
  pointer-events: none;
}
.trace-svg {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}
.trace {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
/* The glow layer — same geometry, fat soft stroke under the crisp line */
.trace-glow {
  fill: none;
  stroke: var(--accent);
  stroke-width: 4.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0.3;
  filter: blur(4px);
}
/* The pulse — a short bright comet that flows along the trace forever. */
.trace-pulse {
  fill: none;
  stroke: var(--accent-bright);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  opacity: 0;
  filter: drop-shadow(var(--glow-trace));
}
/* Variants */
.trace--stock { stroke: var(--danger); }          /* chart contrast ONLY  */
.trace-glow--stock { stroke: var(--danger); }
.trace--dim  { opacity: 0.6; }                    /* background echoes    */

html.anim .trace,
html.anim .trace-glow {
  transition: stroke-dashoffset var(--dur-trace) var(--ease-glide);
}
html.anim .trace-pulse.is-flowing {
  opacity: 1;
  transition: opacity 600ms ease;
  animation: trace-flow var(--trace-flow-dur, 7s) linear infinite;
}
@keyframes trace-flow {
  to { stroke-dashoffset: var(--trace-flow-end, -1200); }
}
/* Failsafe: viz.js died after motion.js armed html.anim → force-draw */
html.anim:not(.viz-ok) .trace,
html.anim:not(.viz-ok) .trace-glow {
  animation: trace-failsafe 0ms linear 3200ms forwards;
}
@keyframes trace-failsafe { to { stroke-dashoffset: 0; } }

/* ── 12. ATMOSPHERE — the void (monolith hero environment) + aurora washes. ── */

/* The void — put on the hero <section>. Children need z-index ≥ 0 to sit */
.void {
  position: relative;
  isolation: isolate;
  overflow: clip;
  background:
    radial-gradient(120% 90% at 50% -8%, var(--void-glow-a), transparent 58%),
    radial-gradient(80% 48% at 50% 112%, var(--void-glow-b), transparent 60%),
    var(--void-black);
}
/* Single soft top rim-light — the only light source in the void. */
.void-aura {
  position: absolute;
  top: -22%;
  left: 50%;
  width: min(1100px, 120vw);
  height: 70vh;
  min-height: 420px;
  transform: translateX(-50%);
  pointer-events: none;
  z-index: -2;
  background:
    radial-gradient(ellipse 62% 62% at 50% 0%, var(--rim-1), transparent 70%),
    radial-gradient(ellipse 95% 52% at 50% 0%, var(--rim-2), transparent 75%);
  filter: blur(8px);
}
html.anim .void-aura {
  will-change: transform, opacity;
  animation: void-breathe 9s ease-in-out infinite alternate;
}
@keyframes void-breathe {
  from { opacity: 0.82; transform: translateX(-50%) scale(1); }
  to   { opacity: 1;    transform: translateX(-50%) scale(1.05); }
}
/* Heavy cinematic vignette — edges fall to pure black. */
.void-vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(ellipse 92% 78% at 50% 42%, transparent 42%, var(--void-black) 100%);
}

/* Aurora — atmospheric glow behind a section. Host section must carry */
.has-aurora {
  position: relative;
  isolation: isolate;
  overflow: clip;
}
.aurora {
  position: absolute;
  inset: -10% -6%;
  z-index: var(--z-viz);
  pointer-events: none;
  background:
    radial-gradient(56% 48% at 28% 44%, var(--aurora-a), transparent 62%),
    radial-gradient(50% 44% at 76% 54%, var(--aurora-b), transparent 64%),
    radial-gradient(62% 50% at 50% 60%, var(--aurora-c), transparent 66%);
  /* v2.2 QA: filter: blur(64px) saturate(1.05) REMOVED — it forced every */
  opacity: 0.34;
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 25%, #000 72%, transparent 100%);
  mask-image: linear-gradient(180deg, transparent 0%, #000 25%, #000 72%, transparent 100%);
}
/* Variants — pick per section so glows alternate down the page */
.aurora--left   { background:
    radial-gradient(60% 55% at 18% 40%, var(--aurora-a), transparent 64%),
    radial-gradient(44% 40% at 42% 64%, var(--aurora-c), transparent 66%); }
.aurora--right  { background:
    radial-gradient(60% 55% at 82% 44%, var(--aurora-b), transparent 64%),
    radial-gradient(44% 40% at 58% 62%, var(--aurora-d), transparent 66%); }
.aurora--top    { background:
    radial-gradient(80% 60% at 50% 0%, var(--aurora-c), transparent 70%); }
.aurora--band   { opacity: 0.7; }   /* statement bands — full folded field  */
.aurora--whisper { opacity: 0.18; } /* legal / quiet pages                  */
html.anim .aurora--drift {
  will-change: transform;
  animation: aurora-drift 26s ease-in-out infinite alternate;
}
@keyframes aurora-drift {
  from { transform: translate3d(-1.5%, 0, 0) scale(1); }
  to   { transform: translate3d(1.5%, 2%, 0) scale(1.06); }
}

/* ── 13. MONOLITH GLASS — the obsidian slab (the product as an artifact). ── */
.monolith {
  position: relative;
  width: min(760px, 100%);
  margin-inline: auto;
}
.monolith-glass {
  position: relative;
  overflow: hidden;
  /* Cyan-tinted edge — the slab must read as a PRESENT object in the void */
  border: 1px solid var(--slab-edge);
  border-top-color: var(--slab-edge-top);
  border-radius: var(--radius-xl);
  /* background-COLOR, never the shorthand: a later background-image class */
  background-color: var(--slab-face);
  box-shadow:
    var(--shadow-slab),
    0 0 0 1px var(--slab-ring),
    0 26px 70px -18px var(--slab-drop),
    0 0 90px -22px var(--slab-halo);
}
/* Slab face — engineering grid + layered glass light in ONE image stack so */
.monolith-glass.texture-grid {
  background-image:
    linear-gradient(var(--viz-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--viz-grid) 1px, transparent 1px),
    radial-gradient(120% 100% at 50% -25%, var(--slab-glow), transparent 58%),
    linear-gradient(180deg, var(--slab-grad-1), var(--slab-grad-2));
  background-size: 32px 32px, 32px 32px, 100% 100%, 100% 100%;
}
/* Top rim-light hairline catching the slab edge */
.monolith-glass::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--slab-sheen), transparent);
}
.monolith-bar {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  padding: 11px 16px;
  border-bottom: 1px solid var(--line-1);
  background: var(--slab-bar);
}
.monolith-title {
  font: 700 var(--fs-micro) / 1 var(--font-mono);
  letter-spacing: var(--track-micro);
  text-transform: uppercase;
  color: var(--text-3);
}
.monolith-body {
  position: relative;
  padding: clamp(18px, 3vw, 30px);
}
/* Glowing cyan seam beneath the slab — the one hot cyan moment */
.monolith-seam {
  position: absolute;
  left: 14%;
  right: 14%;
  bottom: -2px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  filter: blur(0.5px) drop-shadow(var(--glow-trace));
}
/* Mono telemetry numerals on the slab face */
.monolith-num {
  font: 700 clamp(2rem, 4.5vw, 3rem) / 0.95 var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
  color: var(--accent-bright);
}
.monolith-num small {
  font-size: 0.38em;
  color: var(--text-3);
  letter-spacing: 0;
}

/* ── 14. GAUGES, BARS, SPARKLINES — animated viz primitives (viz.js drives). ── */

/* Arc gauge — svg[data-gauge="0.66"] with a .gauge-fill arc path. */
.gauge-svg { display: block; width: 100%; height: auto; overflow: visible; }
.gauge-track {
  fill: none;
  stroke: var(--viz-track);
  stroke-width: 10;
  stroke-linecap: round;
}
.gauge-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 10;
  stroke-linecap: round;
  filter: drop-shadow(var(--glow-soft));
}
html.anim .gauge-fill {
  transition: stroke-dashoffset var(--dur-gauge) var(--ease-glide);
}
/* Tick + clamp markers (hardware-limit markers use the warm stroke) */
.gauge-tick        { stroke: var(--line-3); stroke-width: 1.5; }
.gauge-tick--clamp { stroke: var(--danger);  stroke-width: 1.5; }
.gauge-readout {
  font: 700 var(--fs-num-lg) / 1 var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--text-1);
}
/* No keyframe failsafe here, by design: offset 0 on a gauge means a FULL */

/* Linear bar — <div class="bar" data-bar="0.62"><span… */
.bar {
  position: relative;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--viz-track);
  overflow: hidden;
}
.bar-fill {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-bright));
  transform-origin: 0 50%;
  transform: scaleX(var(--bar-value, 1));
}
.bar--thick { height: 10px; }
html.anim [data-viz]:not(.viz-in) .bar-fill { transform: scaleX(0); }
html.anim .bar-fill { transition: transform var(--dur-gauge) var(--ease-glide); }
html.anim:not(.viz-ok) .bar-fill { animation: bar-failsafe 0ms linear 3200ms forwards; }
@keyframes bar-failsafe { to { transform: scaleX(var(--bar-value, 1)); } }

/* Sparkline — svg[data-spark="…real values…"]; viz.js builds the geometry. */
.spark-svg { display: block; width: 100%; height: auto; overflow: visible; }
.spark-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.spark-line--stock { stroke: var(--danger); }
.spark-band        { fill: var(--accent-tint-2); stroke: none; }
.spark-band--stock { fill: var(--danger-tint); }
.spark-grid line   { stroke: var(--viz-grid); stroke-width: 1; }
html.anim .spark-line {
  transition: stroke-dashoffset var(--dur-trace) var(--ease-glide);
}
html.anim [data-viz]:not(.viz-in) .spark-band { opacity: 0; }
html.anim .spark-band { transition: opacity var(--dur-3) ease 300ms; }
html.anim:not(.viz-ok) .spark-line { animation: trace-failsafe 0ms linear 3200ms forwards; }
html.anim:not(.viz-ok) .spark-band { animation: rv-failsafe 0ms linear 3200ms forwards; }

/* Chart furniture shared by viz figures. background-color, NOT the… */
.viz-figure {
  background-color: var(--surface-1);
  border: 1px solid var(--line-1);
  border-radius: var(--radius-lg);
  padding: var(--sp-5);
}
.fig-caption,
.viz-caption {
  margin-top: var(--sp-3);
  font: 400 var(--fs-micro) / 1.5 var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--text-3);
}

/* ── 15. CHIPS + STATUS — replaces austere caps text-states. ── */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 11px;
  border: 1px solid var(--line-2);
  border-radius: var(--radius-pill);
  font: 700 var(--fs-micro) / 1 var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--text-3);
  white-space: nowrap;
}
.chip--on {
  border-color: var(--accent-line);
  background: var(--accent-tint-2);
  color: var(--accent-bright);
}
.chip--live {
  border-color: var(--accent-line);
  background: var(--accent-tint-1);
  color: var(--accent-bright);
}
.chip--off { color: var(--text-3); border-style: dashed; }
.chip-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}
html.anim .chip--live .chip-dot { animation: live-pulse 2.4s ease-in-out infinite; }

/* ── 16. TEXTURES + GRADIENT TEXT ── */
/* Faint cyan engineering grid (panels, slab faces) */
.texture-grid {
  background-image:
    linear-gradient(var(--viz-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--viz-grid) 1px, transparent 1px);
  background-size: 32px 32px;
}
/* Scanline film (instrument readouts) — static, zero compositing cost */
.texture-scan {
  background-image: repeating-linear-gradient(
    180deg,
    var(--scanline) 0,
    var(--scanline) 1px,
    transparent 1px,
    transparent 4px
  );
}
/* Gradient-text moment for THE key headline words — both gradient stops */
.accent-grad {
  color: var(--accent-bright);
  background: linear-gradient(92deg, var(--accent-bright), var(--mint));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ── 17. Reveal system .rv is VISIBLE by default. The hidden state exists… ── */
html.anim .rv {
  transition:
    opacity var(--dur-3) ease,
    transform var(--dur-3) var(--ease-glide);
}
html.anim .rv:not(.in-view)          { opacity: 0; transform: translateY(var(--rv-shift)); }
html.anim .rv-left:not(.in-view)     { transform: translateX(calc(-1 * var(--rv-shift))); }
html.anim .rv-right:not(.in-view)    { transform: translateX(var(--rv-shift)); }
html.anim .rv-scale:not(.in-view)    { transform: scale(0.97); }
html.anim:not(.anim-ok) .rv:not(.in-view) { animation: rv-failsafe 0ms linear 3000ms forwards; }
@keyframes rv-failsafe { to { opacity: 1; transform: none; } }

/* Stagger orchestration: put data-stagger on the parent; children carry .rv. */
[data-stagger] > .rv:nth-child(2)  { transition-delay: 80ms; }
[data-stagger] > .rv:nth-child(3)  { transition-delay: 160ms; }
[data-stagger] > .rv:nth-child(4)  { transition-delay: 240ms; }
[data-stagger] > .rv:nth-child(5)  { transition-delay: 320ms; }
[data-stagger] > .rv:nth-child(6)  { transition-delay: 400ms; }
[data-stagger] > .rv:nth-child(7)  { transition-delay: 480ms; }
[data-stagger] > .rv:nth-child(8)  { transition-delay: 560ms; }
[data-stagger] > .rv:nth-child(9)  { transition-delay: 640ms; }
[data-stagger] > .rv:nth-child(n+10) { transition-delay: 720ms; }

/* ── 18. Reduced motion — static, fully visible, nothing moves ── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ── 19. RTL (i18n.js sets dir="rtl" for Arabic) ── */
/* Uppercase tracking has no meaning in Arabic script and breaks shaping */
[dir="rtl"] .kicker,
[dir="rtl"] .mono-label,
[dir="rtl"] .footer-head,
[dir="rtl"] .monolith-title { letter-spacing: 0; }
/* Gradient text reads start→end; mirror the angle */
[dir="rtl"] .accent-grad { background: linear-gradient(268deg, var(--accent-bright), var(--mint));
  -webkit-background-clip: text; background-clip: text; }
/* Numerals + traces stay LTR artifacts inside RTL copy */
[dir="rtl"] .num,
[dir="rtl"] .trace-svg,
[dir="rtl"] .spark-svg,
[dir="rtl"] .gauge-svg { direction: ltr; }