/*
 * Nodera marketing site.
 *
 * The values below are copied from the app's src/shared/design-tokens.css so the public
 * site reads as the same product: one brand hue family from ice to navy, the indigo field
 * for dark surfaces, a light canvas with white panels, and tabular figures wherever a
 * number appears. The static site cannot import the app's stylesheet, so the tokens are
 * duplicated here on purpose; when the app's ramp changes, bring these along.
 */

:root {
  /* brand ramp, sampled from the Nodera IP mark */
  --nd-brand-ice: #cfe8f7;
  --nd-brand-sky: #8fcdec;
  --nd-brand-azure: #4fa3dc;
  --nd-brand-royal: #1f63b8;
  --nd-brand-indigo: #2c3a96;
  --nd-brand-navy: #101c6e;
  --nd-brand-glow: #6fc4f0;

  --nd-brand-link: linear-gradient(90deg, var(--nd-brand-sky), var(--nd-brand-azure) 55%, var(--nd-brand-royal));
  --nd-brand-field: linear-gradient(170deg, var(--nd-brand-indigo), var(--nd-brand-navy));
  --nd-heading-wash: linear-gradient(105deg, #ffffff 0%, #f4f8ff 100%);
  --nd-ink: #162033;

  /* interaction */
  --nd-accent: var(--nd-brand-royal);
  --nd-accent-strong: #174e94;
  --nd-accent-soft: #eaf3fb;
  --nd-focus: rgba(31, 99, 184, .34);

  /* brand field (dark surfaces) */
  --nd-field: var(--nd-brand-field);
  --nd-field-text: #eaf2fb;
  --nd-field-text-muted: #9fb4d8;
  --nd-field-line: rgba(143, 205, 236, .18);
  --nd-field-active: rgba(143, 205, 236, .14);

  /* text */
  --nd-text: #162033;
  --nd-text-muted: #5b6b80;
  --nd-text-faint: #8496ab;
  --nd-text-on-accent: #ffffff;

  /* surfaces */
  --nd-canvas: #eef3f9;
  --nd-surface: #ffffff;
  --nd-surface-sunken: #f7fbff;

  /* lines */
  --nd-line: #dbe5f0;
  --nd-line-strong: #c8d9ed;

  /* elevation */
  --nd-shadow-hue: 213 40% 22%;
  --nd-elevation-1:
    0 1px 2px hsl(var(--nd-shadow-hue) / .06),
    0 1px 1px hsl(var(--nd-shadow-hue) / .04);
  --nd-elevation-2: 0 7px 20px rgba(24, 62, 112, .08);
  --nd-elevation-3:
    0 4px 8px hsl(var(--nd-shadow-hue) / .08),
    0 12px 28px hsl(var(--nd-shadow-hue) / .10);
  --nd-sheen: inset 0 1px 0 rgba(255, 255, 255, .55);

  /* space */
  --nd-space-1: 4px;
  --nd-space-2: 8px;
  --nd-space-3: 12px;
  --nd-space-4: 16px;
  --nd-space-5: 24px;
  --nd-space-6: 32px;

  /* radius */
  --nd-radius-sm: 6px;
  --nd-radius-md: 12px;
  --nd-radius-lg: 14px;
  --nd-radius-pill: 999px;

  /* type */
  --nd-font: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --nd-font-num: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, monospace;

  /* status (PRD B.19): only the categories the site needs */
  --nd-ok-bg: #e6f6ed;   --nd-ok-line: #a8dcbf;   --nd-ok-text: #1b6b43;
  --nd-wait-bg: #fdf4dc; --nd-wait-line: #ecd08a; --nd-wait-text: #8a6410;
  --nd-warn-bg: #fdeddf; --nd-warn-line: #f0bd8c; --nd-warn-text: #94520f;
  --nd-idle-bg: #eef1f5; --nd-idle-line: #cbd5e1; --nd-idle-text: #556377;

  /* site layout */
  --site-max: 1120px;
  --site-gutter: 24px;
  --site-header: 64px;
}

/* ---------------------------------------------------------------- reset ---- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--site-header) + 16px);
}

body {
  margin: 0;
  font-family: var(--nd-font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--nd-text);
  background: var(--nd-canvas);
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--nd-accent); text-decoration: none; }
a:hover { color: var(--nd-accent-strong); text-decoration: underline; }

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

h1, h2, h3, h4 { margin: 0; line-height: 1.25; font-weight: 700; letter-spacing: -.01em; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; }

code, kbd, .num {
  font-family: var(--nd-font-num);
  font-variant-numeric: tabular-nums;
}
code, kbd {
  font-size: .92em;
  background: var(--nd-surface-sunken);
  border: 1px solid var(--nd-line);
  border-radius: var(--nd-radius-sm);
  padding: 1px 6px;
  word-break: break-all;
}
pre {
  margin: 0;
  padding: var(--nd-space-4);
  background: var(--nd-ink);
  color: var(--nd-brand-ice);
  border-radius: var(--nd-radius-md);
  font-family: var(--nd-font-num);
  font-size: 14px;
  line-height: 1.6;
  overflow-x: auto;
}
pre code { background: none; border: 0; padding: 0; color: inherit; font-size: inherit; word-break: normal; }

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

/* -------------------------------------------------------------- layout ---- */

.container {
  width: 100%;
  max-width: var(--site-max);
  margin: 0 auto;
  padding: 0 var(--site-gutter);
}

/* ---------------------------------------------------------------- header --- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  height: var(--site-header);
  background: var(--nd-field);
  color: var(--nd-field-text);
  border-bottom: 1px solid var(--nd-field-line);
}
.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--nd-space-5);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--nd-field-text);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .01em;
  white-space: nowrap;
}
.brand:hover { color: #fff; text-decoration: none; }
.brand img { width: 32px; height: 32px; }
.brand-name { color: #fff; }
.brand-name em { font-style: normal; color: var(--nd-brand-glow); }

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--nd-space-2);
}
.site-nav a {
  color: var(--nd-field-text);
  padding: 7px 12px;
  border-radius: var(--nd-radius-sm);
  font-size: 14px;
  font-weight: 500;
}
.site-nav a:hover { background: var(--nd-field-active); color: #fff; text-decoration: none; }
.site-nav a[aria-current="page"] { background: var(--nd-field-active); color: #fff; }
.site-nav .btn { margin-left: var(--nd-space-2); }
.site-nav a { white-space: nowrap; }
/* The header button carries a long and a short label; only one is shown at a time. */
.nav-btn-short { display: none; }

/* Language switcher: native <select> dressed for the brand field. Option labels are the
   languages' own names and are never translated. */
.lang-switch { flex: none; display: inline-flex; align-items: center; }
.lang-switch select {
  appearance: none;
  -webkit-appearance: none;
  min-height: 36px;
  padding: 0 28px 0 12px;
  border: 1px solid rgba(143, 205, 236, .45);
  border-radius: var(--nd-radius-sm);
  background-color: transparent;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239fb4d8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  color: var(--nd-field-text);
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
}
.lang-switch select:hover { background-color: var(--nd-field-active); color: #fff; border-color: var(--nd-brand-sky); }
.lang-switch select option { color: var(--nd-text); background: var(--nd-surface); }

/* --------------------------------------------------------------- buttons --- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--nd-radius-sm);
  border: 1px solid transparent;
  font: inherit;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  text-decoration: none;
  transition: background-color .15s ease, border-color .15s ease, box-shadow .15s ease, transform .05s ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--nd-accent);
  color: var(--nd-text-on-accent);
  box-shadow: var(--nd-elevation-1), var(--nd-sheen);
}
.btn-primary:hover { background: var(--nd-accent-strong); color: #fff; }

.btn-ghost {
  background: transparent;
  color: var(--nd-field-text);
  border-color: rgba(143, 205, 236, .45);
}
.btn-ghost:hover { background: var(--nd-field-active); color: #fff; border-color: var(--nd-brand-sky); }

.btn-light {
  background: #fff;
  color: var(--nd-brand-navy);
  border-color: transparent;
  box-shadow: var(--nd-elevation-1);
}
.btn-light:hover { background: var(--nd-brand-ice); color: var(--nd-brand-navy); }

.btn-lg { min-height: 56px; padding: 0 32px; font-size: 17px; border-radius: 10px; }

.btn.is-disabled,
.btn[aria-disabled="true"] {
  background: var(--nd-idle-bg);
  color: var(--nd-idle-text);
  border-color: var(--nd-idle-line);
  box-shadow: none;
  cursor: not-allowed;
  pointer-events: none;
}

/* ------------------------------------------------------------------ hero --- */

.hero {
  position: relative;
  overflow: hidden;
  background: var(--nd-field);
  color: var(--nd-field-text);
  padding: 72px 0 80px;
  isolation: isolate;
}
/* The orbit: a faint arc of light behind the copy, echoing the mark's ring. */
.hero::before {
  content: "";
  position: absolute;
  inset: auto -20% -60% auto;
  width: 900px;
  height: 900px;
  border-radius: 50%;
  border: 1px solid rgba(143, 205, 236, .22);
  box-shadow: 0 0 0 80px rgba(143, 205, 236, .04), 0 0 120px rgba(111, 196, 240, .12);
  pointer-events: none;
  z-index: -1;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(60% 50% at 80% 20%, rgba(111, 196, 240, .16), transparent 70%);
  pointer-events: none;
  z-index: -1;
}
.hero .container {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  align-items: center;
  gap: 48px;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--nd-brand-sky);
  margin-bottom: var(--nd-space-4);
}
.hero-eyebrow::before {
  content: "";
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--nd-brand-glow);
  box-shadow: 0 0 0 4px rgba(111, 196, 240, .25), 0 0 14px var(--nd-brand-glow);
}
.hero h1 {
  font-size: 48px;
  color: #fff;
  margin-bottom: var(--nd-space-3);
}
.hero h1 em { font-style: normal; color: var(--nd-brand-glow); }
.hero-tagline {
  font-size: 22px;
  font-weight: 600;
  color: var(--nd-field-text);
  margin-bottom: var(--nd-space-2);
}
.hero-motto {
  font-size: 13px;
  letter-spacing: .18em;
  font-style: italic;
  color: var(--nd-field-text-muted);
  margin-bottom: var(--nd-space-5);
}
.hero-lede {
  font-size: 16px;
  color: var(--nd-field-text-muted);
  max-width: 52ch;
  margin-bottom: var(--nd-space-6);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--nd-space-3); }
/* Labels in French and Japanese run long: let the large buttons wrap instead of overflowing. */
.hero-actions .btn { white-space: normal; text-align: center; line-height: 1.25; padding-top: 12px; padding-bottom: 12px; }
.hero-note { margin-top: var(--nd-space-4); font-size: 13px; color: var(--nd-field-text-muted); }

.hero-art {
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-art img {
  width: min(100%, 380px);
  filter: drop-shadow(0 24px 48px rgba(16, 28, 110, .55));
}

/* --------------------------------------------------------------- sections -- */

.section { padding: 72px 0; }
.section + .section { padding-top: 0; }
.section-head { max-width: 62ch; margin-bottom: var(--nd-space-6); }
.section-kicker {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--nd-accent);
  margin-bottom: var(--nd-space-2);
}
.section h2 { font-size: 30px; margin-bottom: var(--nd-space-3); }
.section-head p { color: var(--nd-text-muted); font-size: 16px; }

.grid { display: grid; gap: var(--nd-space-4); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card {
  background: var(--nd-surface);
  border: 1px solid var(--nd-line-strong);
  border-radius: var(--nd-radius-md);
  box-shadow: var(--nd-elevation-2);
  padding: var(--nd-space-5);
}
.card h3 { font-size: 17px; margin-bottom: var(--nd-space-2); }
.card p { color: var(--nd-text-muted); font-size: 15px; }

/* Numbered steps share the card, plus a lit-node counter on the brand ramp. */
.steps { counter-reset: step; }
.step { position: relative; counter-increment: step; }
.step-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--nd-field);
  color: #fff;
  font-family: var(--nd-font-num);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: var(--nd-space-4);
  box-shadow: 0 0 0 4px var(--nd-accent-soft);
}
.step-index::before { content: counter(step); }

.feature-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--nd-accent-soft);
  color: var(--nd-accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--nd-space-4);
}
.feature-icon svg { width: 22px; height: 22px; }

/* Trust panel: dark, so the light card grid has one anchor on the field. */
.panel-dark {
  background: var(--nd-field);
  color: var(--nd-field-text);
  border-radius: var(--nd-radius-lg);
  padding: 48px;
  box-shadow: var(--nd-elevation-3);
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 48px;
  align-items: start;
}
.panel-dark .section-kicker { color: var(--nd-brand-sky); }
.panel-dark h2 { color: #fff; }
.panel-dark p { color: var(--nd-field-text-muted); }
.trust-list { list-style: none; display: grid; gap: var(--nd-space-4); }
.trust-list li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: var(--nd-space-3);
  padding: var(--nd-space-4);
  border: 1px solid var(--nd-field-line);
  border-radius: var(--nd-radius-md);
  background: rgba(255, 255, 255, .03);
}
.trust-list strong { display: block; color: #fff; font-size: 15px; margin-bottom: 2px; }
.trust-list span { color: var(--nd-field-text-muted); font-size: 14px; }
.trust-list svg { width: 24px; height: 24px; color: var(--nd-brand-glow); margin-top: 2px; }

.cta-band { text-align: center; padding: 64px 0 80px; }
.cta-band h2 { font-size: 28px; margin-bottom: var(--nd-space-3); }
.cta-band p { color: var(--nd-text-muted); margin-bottom: var(--nd-space-5); }
.cta-band .hero-actions { justify-content: center; }
.cta-band .btn-ghost { color: var(--nd-accent); border-color: var(--nd-line-strong); }
.cta-band .btn-ghost:hover { background: var(--nd-accent-soft); color: var(--nd-accent-strong); }

/* ---------------------------------------------------------------- footer --- */

.site-footer {
  background: var(--nd-brand-navy);
  color: var(--nd-field-text-muted);
  border-top: 1px solid var(--nd-field-line);
  padding: 32px 0;
  font-size: 14px;
}
.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--nd-space-4) var(--nd-space-5);
}
.site-footer .brand { font-size: 15px; }
.site-footer .brand img { width: 24px; height: 24px; }
.footer-links { display: flex; flex-wrap: wrap; gap: var(--nd-space-4); margin-left: auto; }
.footer-links a { color: var(--nd-field-text); }
.footer-links a:hover { color: #fff; }
.footer-copy { width: 100%; font-size: 13px; color: var(--nd-field-text-muted); }

/* --------------------------------------------------------- download page --- */

.download-hero { padding: 56px 0 64px; }
.download-hero .container {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 440px);
  gap: 48px;
  align-items: center;
}
.download-hero h1 { font-size: 40px; }
.download-hero .hero-lede { margin-bottom: var(--nd-space-5); }

.download-card {
  background: var(--nd-surface);
  color: var(--nd-text);
  border-radius: var(--nd-radius-lg);
  box-shadow: var(--nd-elevation-3);
  padding: var(--nd-space-6);
}
.download-card .btn { width: 100%; }
.download-card .btn-primary { background: var(--nd-accent); }
.download-meta {
  margin-top: var(--nd-space-5);
  display: grid;
  gap: 0;
  border-top: 1px solid var(--nd-line);
}
.download-meta > div {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: var(--nd-space-3);
  padding: 10px 0;
  border-bottom: 1px solid var(--nd-line);
  font-size: 14px;
  align-items: baseline;
}
.download-meta dt { color: var(--nd-text-muted); margin: 0; }
.download-meta dd { margin: 0; min-width: 0; font-family: var(--nd-font-num); font-variant-numeric: tabular-nums; }
.download-meta dd.hash { font-size: 12px; word-break: break-all; line-height: 1.5; }
.download-meta dd:empty::before { content: "—"; color: var(--nd-text-faint); }

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--nd-space-4);
  padding: 4px 10px;
  border-radius: var(--nd-radius-pill);
  font-size: 12px;
  font-weight: 600;
  border: 1px solid var(--nd-idle-line);
  background: var(--nd-idle-bg);
  color: var(--nd-idle-text);
}
.status-pill::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.status-pill[data-state="ready"] { background: var(--nd-ok-bg); border-color: var(--nd-ok-line); color: var(--nd-ok-text); }
.status-pill[data-state="pending"] { background: var(--nd-wait-bg); border-color: var(--nd-wait-line); color: var(--nd-wait-text); }

.download-card .fine { margin-top: var(--nd-space-3); font-size: 12px; color: var(--nd-text-faint); }

/* Content sections on the download page: a two-column reading layout. */
.doc { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 48px; align-items: start; }
.doc-nav {
  position: sticky;
  top: calc(var(--site-header) + 24px);
  display: grid;
  gap: 2px;
  list-style: none;
}
.doc-nav a {
  display: block;
  padding: 8px 12px;
  border-radius: var(--nd-radius-sm);
  color: var(--nd-text-muted);
  font-size: 14px;
  border-left: 2px solid transparent;
}
.doc-nav a:hover { background: var(--nd-surface); color: var(--nd-text); text-decoration: none; }
.doc-body { display: grid; gap: var(--nd-space-5); }
.doc-body .card { padding: var(--nd-space-6); }
.doc-body h2 { font-size: 22px; margin-bottom: var(--nd-space-4); }
.doc-body h3 { font-size: 16px; margin-bottom: var(--nd-space-2); }
.doc-body p, .doc-body li { color: var(--nd-text); font-size: 15px; }
.doc-body p + p, .doc-body p + ul, .doc-body p + ol, .doc-body ul + p, .doc-body ol + p, .doc-body pre + p, .doc-body p + pre { margin-top: var(--nd-space-3); }
.doc-body ul, .doc-body ol { padding-left: 22px; display: grid; gap: 6px; }
.doc-body .muted { color: var(--nd-text-muted); font-size: 14px; }

.spec-list { list-style: none; padding: 0; display: grid; gap: 0; }
.spec-list li {
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr);
  gap: var(--nd-space-4);
  padding: 12px 0;
  border-bottom: 1px solid var(--nd-line);
}
.spec-list li:last-child { border-bottom: 0; }
.spec-list b { color: var(--nd-text-muted); font-weight: 600; }

.install-steps { list-style: none; padding: 0; display: grid; gap: var(--nd-space-4); counter-reset: step; }
.install-steps li {
  counter-increment: step;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: var(--nd-space-4);
  align-items: start;
}
.install-steps li::before {
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--nd-field);
  color: #fff;
  font-family: var(--nd-font-num);
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 0 0 4px var(--nd-accent-soft);
}
.install-steps strong { display: block; margin-bottom: 2px; }

.callout {
  margin-top: var(--nd-space-4);
  padding: var(--nd-space-4);
  border-radius: var(--nd-radius-md);
  border: 1px solid var(--nd-warn-line);
  background: var(--nd-warn-bg);
  color: var(--nd-warn-text);
  font-size: 14px;
}
.callout strong { display: block; margin-bottom: 4px; }
.callout-info { border-color: var(--nd-line-strong); background: var(--nd-surface-sunken); color: var(--nd-text); }
.callout-info strong { color: var(--nd-accent); }

.privacy-table { display: grid; gap: var(--nd-space-4); }
.privacy-table > div {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: var(--nd-space-4);
  padding: var(--nd-space-4);
  background: var(--nd-surface-sunken);
  border: 1px solid var(--nd-line);
  border-radius: var(--nd-radius-md);
}
.privacy-table dt { font-weight: 700; margin: 0; }
.privacy-table dd { margin: 0; min-width: 0; }
.privacy-table dd ul { margin-top: 6px; }

.faq { display: grid; gap: var(--nd-space-2); }
.faq details {
  border: 1px solid var(--nd-line);
  border-radius: var(--nd-radius-md);
  background: var(--nd-surface-sunken);
  padding: 0 var(--nd-space-4);
}
.faq summary {
  cursor: pointer;
  padding: 14px 0;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--nd-space-3);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: "";
  width: 8px; height: 8px;
  border-right: 2px solid var(--nd-accent);
  border-bottom: 2px solid var(--nd-accent);
  transform: rotate(-45deg);
  transition: transform .15s ease;
  flex: none;
}
.faq details[open] summary::before { transform: rotate(45deg); }
.faq details p { padding: 0 0 14px 20px; color: var(--nd-text-muted); }

/* ------------------------------------------------------------ responsive --- */

@media (max-width: 1100px) {
  .site-header .container { gap: var(--nd-space-4); }
  .site-nav { gap: 2px; }
  .site-nav a { padding: 7px 9px; font-size: 13px; }
  .hero h1 { font-size: 42px; }
  .hero .container { gap: 32px; }
  .hero-art img { width: min(100%, 320px); }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .panel-dark { grid-template-columns: 1fr; gap: 32px; padding: 40px; }
  .download-hero .container { grid-template-columns: minmax(0, 1fr) minmax(300px, 400px); gap: 32px; }
  .doc { grid-template-columns: 180px minmax(0, 1fr); gap: 32px; }
}

/* Between phone and desktop the translated nav no longer fits beside the brand on one
   line, so the header is allowed to grow and wrap its rows. */
@media (max-width: 900px) {
  .site-header { height: auto; min-height: var(--site-header); }
  .site-header .container { flex-wrap: wrap; padding-top: 8px; padding-bottom: 8px; row-gap: 4px; }
  .site-nav { flex-wrap: wrap; row-gap: 4px; }
}

@media (max-width: 860px) {
  .hero { padding: 56px 0 64px; }
  .hero .container { grid-template-columns: 1fr; }
  .hero-art { order: -1; }
  .hero-art img { width: min(60%, 260px); }
  .grid-3 { grid-template-columns: 1fr; }
  .download-hero .container { grid-template-columns: 1fr; }
  .doc { grid-template-columns: 1fr; }
  .doc-nav { position: static; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
  .doc-nav a { border-left: 0; background: var(--nd-surface); border: 1px solid var(--nd-line); text-align: center; }
}

@media (max-width: 600px) {
  :root { --site-gutter: 16px; --site-header: 56px; }
  body { font-size: 15px; }
  /* Back to one row: brand, the short button label, and the language switcher. */
  .site-header { height: var(--site-header); }
  .site-header .container { flex-wrap: nowrap; padding-top: 0; padding-bottom: 0; gap: 10px; }
  .brand { font-size: 16px; gap: 8px; }
  .site-nav a:not(.btn) { display: none; }
  .site-nav .btn { min-height: 38px; padding: 0 14px; font-size: 14px; margin-left: 0; }
  .nav-btn-long { display: none; }
  .nav-btn-short { display: inline; }
  .lang-switch select { min-height: 34px; padding: 0 24px 0 8px; font-size: 13px; background-position: right 7px center; }
  .hero-actions .btn { padding-left: 20px; padding-right: 20px; }
  .hero { padding: 40px 0 48px; }
  .hero h1 { font-size: 34px; }
  .hero-tagline { font-size: 18px; }
  .hero-motto { font-size: 11px; letter-spacing: .14em; }
  .hero-actions .btn { width: 100%; }
  .section { padding: 48px 0; }
  .section h2 { font-size: 24px; }
  .grid-4, .grid-2 { grid-template-columns: 1fr; }
  .card { padding: var(--nd-space-4); }
  .panel-dark { padding: var(--nd-space-5); border-radius: var(--nd-radius-md); }
  .cta-band { padding: 40px 0 56px; }
  .cta-band h2 { font-size: 22px; }
  .footer-links { margin-left: 0; }
  .download-hero { padding: 40px 0 48px; }
  .download-hero h1 { font-size: 30px; }
  .download-card { padding: var(--nd-space-5); }
  .download-meta > div { grid-template-columns: 72px minmax(0, 1fr); }
  .doc-body .card { padding: var(--nd-space-4); }
  .doc-body h2 { font-size: 20px; }
  .spec-list li, .privacy-table > div { grid-template-columns: 1fr; gap: 4px; }
  .install-steps li { grid-template-columns: 28px minmax(0, 1fr); gap: var(--nd-space-3); }
  .install-steps li::before { width: 26px; height: 26px; font-size: 13px; }
  pre { font-size: 12px; padding: var(--nd-space-3); }
}