/* ZenBrain landing page — v1
 * Tokens from brand/tokens/zenbrain-tokens.css ("Still Waters")
 * Mobile-first; dark/light via prefers-color-scheme + manual toggle
 */

/* ─── Tokens (subset, inlined for single-file CSS) ─── */
:root {
  /* Slate */
  --slate-950:#0F1215; --slate-900:#1A1F2E; --slate-800:#252B3D; --slate-700:#2D3447;
  --slate-600:#4A5270; --slate-400:#9CA3AF; --slate-300:#D1D5DB; --slate-200:#E5E7EB;
  --slate-100:#F3F4F6; --slate-50:#F9FAFB;
  /* Indigo / Teal */
  --indigo-700:#4338CA; --indigo-600:#4F46E5; --indigo-500:#6366F1;
  --indigo-400:#818CF8; --indigo-300:#A5B4FC; --indigo-100:#E0E7FF;
  --teal-600:#0891B2; --teal-500:#06B6D4; --teal-400:#22D3EE; --teal-100:#CFFAFE;
  --violet-500:#8B5CF6;
  /* Brand */
  --brand-gradient: linear-gradient(135deg, #06B6D4 0%, #6366F1 100%);

  /* Semantic — Light (default) */
  --bg: var(--slate-50);
  --surface: #ffffff;
  --surface-alt: var(--slate-100);
  --border: var(--slate-200);
  --border-strong: var(--slate-300);
  --text: var(--slate-900);
  --text-2: var(--slate-600);
  --text-3: var(--slate-400);
  --primary: var(--indigo-500);
  --primary-hover: var(--indigo-600);
  --primary-fg: #ffffff;
  --primary-subtle: var(--indigo-100);
  --accent: var(--teal-500);
  --focus: 0 0 0 3px rgba(99,102,241,.35);
  --shadow-sm: 0 1px 2px rgba(15,18,21,.06), 0 1px 3px rgba(15,18,21,.04);
  --shadow-md: 0 4px 16px rgba(15,18,21,.06), 0 2px 4px rgba(15,18,21,.04);
  --shadow-lg: 0 24px 60px -12px rgba(15,18,21,.18), 0 8px 24px -8px rgba(15,18,21,.10);

  /* Type */
  --font: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, monospace;

  /* Spacing scale */
  --s-1:4px; --s-2:8px; --s-3:12px; --s-4:16px; --s-5:20px; --s-6:24px;
  --s-8:32px; --s-10:40px; --s-12:48px; --s-14:56px; --s-16:64px; --s-20:80px; --s-24:96px;

  /* Radii */
  --r-sm:6px; --r-md:10px; --r-lg:14px; --r-xl:20px; --r-2xl:28px; --r-pill:999px;

  /* Layout */
  --max-w: 1120px;
  --max-w-narrow: 760px;
}

/* ─── Dark mode (system + manual override) ─── */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--slate-950);
    --surface: var(--slate-900);
    --surface-alt: var(--slate-800);
    --border: var(--slate-700);
    --border-strong: var(--slate-600);
    --text: var(--slate-50);
    --text-2: var(--slate-300);
    --text-3: var(--slate-400);
    --primary: var(--indigo-400);
    --primary-hover: var(--indigo-300);
    --primary-fg: var(--slate-900);
    --primary-subtle: rgba(129,140,248,.18);
    --accent: var(--teal-400);
    --focus: 0 0 0 3px rgba(129,140,248,.45);
    --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
    --shadow-md: 0 4px 16px rgba(0,0,0,.4), 0 2px 4px rgba(0,0,0,.25);
    --shadow-lg: 0 24px 60px -12px rgba(0,0,0,.55), 0 8px 24px -8px rgba(0,0,0,.4);
  }
}
:root[data-theme="light"] {
  --bg: var(--slate-50); --surface:#fff; --surface-alt:var(--slate-100);
  --border: var(--slate-200); --border-strong: var(--slate-300);
  --text: var(--slate-900); --text-2: var(--slate-600); --text-3: var(--slate-400);
  --primary: var(--indigo-500); --primary-hover: var(--indigo-600); --primary-fg:#fff;
  --primary-subtle: var(--indigo-100); --accent: var(--teal-500);
  --focus: 0 0 0 3px rgba(99,102,241,.35);
  --shadow-sm: 0 1px 2px rgba(15,18,21,.06), 0 1px 3px rgba(15,18,21,.04);
  --shadow-md: 0 4px 16px rgba(15,18,21,.06), 0 2px 4px rgba(15,18,21,.04);
  --shadow-lg: 0 24px 60px -12px rgba(15,18,21,.18), 0 8px 24px -8px rgba(15,18,21,.10);
}
:root[data-theme="dark"] {
  --bg: var(--slate-950); --surface:var(--slate-900); --surface-alt:var(--slate-800);
  --border: var(--slate-700); --border-strong:var(--slate-600);
  --text: var(--slate-50); --text-2: var(--slate-300); --text-3: var(--slate-400);
  --primary: var(--indigo-400); --primary-hover:var(--indigo-300); --primary-fg:var(--slate-900);
  --primary-subtle: rgba(129,140,248,.18); --accent: var(--teal-400);
  --focus: 0 0 0 3px rgba(129,140,248,.45);
  --shadow-sm: 0 1px 2px rgba(0,0,0,.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,.4), 0 2px 4px rgba(0,0,0,.25);
  --shadow-lg: 0 24px 60px -12px rgba(0,0,0,.55), 0 8px 24px -8px rgba(0,0,0,.4);
}

/* ─── Reset ─── */
*,*::before,*::after { box-sizing: border-box; }
html { -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior:auto; } }
body {
  margin:0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img,svg { display:block; max-width:100%; }
button { font: inherit; color: inherit; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
ul,ol { margin:0; padding:0; }
h1,h2,h3,h4,h5,h6,p { margin:0; }
:focus-visible { outline: none; box-shadow: var(--focus); border-radius: var(--r-sm); }

/* Show light/dark lockups based on theme */
.brand__lockup--dark { display:none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .brand__lockup--light { display:none; }
  :root:not([data-theme="light"]) .brand__lockup--dark  { display:block; }
}
:root[data-theme="dark"] .brand__lockup--light { display:none; }
:root[data-theme="dark"] .brand__lockup--dark  { display:block; }
:root[data-theme="light"] .brand__lockup--light { display:block; }
:root[data-theme="light"] .brand__lockup--dark  { display:none; }

/* ─── Layout primitives ─── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--s-5);
}
@media (min-width: 720px) { .container { padding: 0 var(--s-8); } }

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

.skip-link {
  position:absolute; top:-40px; left:8px;
  background: var(--surface); color: var(--text);
  padding: 8px 14px; border-radius: var(--r-md);
  border: 1px solid var(--border); box-shadow: var(--shadow-md);
  z-index: 100; font-weight: 600;
}
.skip-link:focus { top: 8px; }

.section {
  padding: var(--s-16) 0;
}
@media (min-width: 720px) { .section { padding: var(--s-20) 0; } }
@media (min-width: 1024px) { .section { padding: var(--s-24) 0; } }

.section__head { max-width: 720px; margin-bottom: var(--s-10); }
.section__head--center { text-align:center; margin-left:auto; margin-right:auto; }
.section__lede {
  font-size: 1.0625rem; line-height: 1.6; color: var(--text-2);
  margin-top: var(--s-4);
}

/* ─── Typography ─── */
.display {
  font-size: clamp(2.25rem, 6vw + 1rem, 4.25rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.025em;
  color: var(--text);
}
.display--small {
  font-size: clamp(2rem, 4vw + 1rem, 3.25rem);
}
.display__accent {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
@supports not (background-clip: text) {
  .display__accent { color: var(--primary); background: none; }
}
.h-section {
  font-size: clamp(1.75rem, 2.5vw + 1rem, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.h-eyebrow {
  font-size: .8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: var(--s-3);
}
.kicker {
  font-size: .875rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--s-3);
}
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--s-2);
  font-size: .8125rem; font-weight: 500; letter-spacing: 0.02em;
  color: var(--text-2);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: 6px 12px;
  margin-bottom: var(--s-5);
}
.eyebrow--header { display: none; margin: 0; }
@media (min-width: 720px) { .eyebrow--header { display: inline-flex; } }

.lede {
  font-size: 1.125rem; line-height: 1.6; color: var(--text-2);
  max-width: 56ch;
}
.trust-line {
  font-size: .875rem; color: var(--text-3); margin-top: var(--s-4);
}
.link {
  color: var(--primary); font-weight: 500;
  border-bottom: 1px solid transparent;
  transition: border-color .15s ease;
}
.link:hover { text-decoration: none; border-bottom-color: currentColor; }

/* ─── Header ─── */
.site-header {
  position: relative;
  padding: var(--s-5) 0;
  z-index: 5;
}
.site-header__inner {
  display:flex; align-items:center; justify-content:space-between;
  gap: var(--s-4);
}
.brand { display:inline-flex; align-items:center; }
.brand__lockup { height: 28px; width: auto; }
@media (min-width: 720px) { .brand__lockup { height: 32px; } }

/* ─── Buttons ─── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--s-2);
  font-size: 1rem; font-weight: 600; line-height: 1;
  padding: 14px 22px;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform .12s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
  min-height: 48px; /* a11y target */
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--brand-gradient);
  color: #fff;
  box-shadow: 0 6px 20px -8px rgba(99,102,241,.55), 0 2px 6px rgba(99,102,241,.18);
}
.btn--primary:hover { filter: brightness(1.05); box-shadow: 0 10px 24px -8px rgba(99,102,241,.65), 0 4px 8px rgba(99,102,241,.22); }
.btn--ghost {
  background: transparent; color: var(--text);
  border-color: var(--border-strong);
}
.btn--ghost:hover { background: var(--surface); border-color: var(--text-2); }

.cta-row {
  display: flex; flex-wrap: wrap; gap: var(--s-3);
  margin-top: var(--s-6);
}

/* ─── HERO ─── */
.hero { position: relative; padding: var(--s-12) 0 var(--s-16); overflow: hidden; }
@media (min-width: 720px) { .hero { padding: var(--s-16) 0 var(--s-20); } }
@media (min-width: 1024px) { .hero { padding: var(--s-20) 0 var(--s-24); } }

.hero__bg {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  overflow: hidden;
}
.hero__blob {
  position: absolute;
  top: -20%; right: -20%;
  width: 70vw; max-width: 900px; aspect-ratio: 1 / 1;
  background: var(--brand-gradient);
  filter: blur(80px);
  opacity: .22;
  border-radius: 50%;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .hero__blob { opacity: .35; }
}
:root[data-theme="dark"] .hero__blob { opacity: .35; }
:root[data-theme="light"] .hero__blob { opacity: .22; }

.hero__inner {
  position: relative; z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-12);
  align-items: center;
}
@media (min-width: 960px) {
  .hero__inner { grid-template-columns: 1.1fr .9fr; gap: var(--s-16); }
}
.hero__copy { max-width: 600px; }

/* ─── Hero visual: ZenBrain Overview card ─── */
.hero__visual { width: 100%; }
.overview {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-2xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: translateY(0);
  position: relative;
}
.overview::before {
  content: ""; position:absolute; inset:-1px;
  border-radius: inherit;
  background: var(--brand-gradient);
  opacity: 0; z-index: -1; padding: 1px;
}
.overview__chrome {
  display: flex; align-items: center; gap: var(--s-2);
  padding: var(--s-3) var(--s-4);
  border-bottom: 1px solid var(--border);
  background: var(--surface-alt);
}
.overview__dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--border-strong);
}
.overview__dot:nth-child(1) { background: #ff5f57; }
.overview__dot:nth-child(2) { background: #febc2e; }
.overview__dot:nth-child(3) { background: #28c840; }
.overview__title {
  margin-left: var(--s-3);
  font-size: .8125rem; font-weight: 600; color: var(--text-2);
  letter-spacing: 0.01em;
}
.overview__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-3);
  padding: var(--s-4);
}
@media (min-width: 480px) {
  .overview__grid { gap: var(--s-4); padding: var(--s-5); }
}

.grp {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--s-4);
  display: flex; flex-direction: column; gap: var(--s-3);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  /* assemble animation */
  opacity: 0;
  transform: translateY(8px) scale(.985);
  animation: grp-in .6s cubic-bezier(.2,.8,.2,1) forwards;
  animation-delay: calc(var(--i, 0) * 110ms + 120ms);
}
@media (prefers-reduced-motion: reduce) {
  .grp { animation: none; opacity: 1; transform: none; }
}
.grp:hover { border-color: var(--border-strong); box-shadow: var(--shadow-sm); }
.grp header {
  display: flex; align-items: center; gap: var(--s-2);
}
.grp__title {
  flex: 1;
  font-size: .9375rem; font-weight: 600; color: var(--text);
  letter-spacing: -.005em;
  margin: 0;
}
.grp__count {
  font-size: .75rem; font-weight: 600;
  color: var(--text-2);
  background: var(--surface-alt);
  padding: 2px 8px; border-radius: var(--r-pill);
  font-variant-numeric: tabular-nums;
}
.grp__pill { width: 8px; height: 24px; border-radius: var(--r-pill); flex: 0 0 8px; }
.grp__pill--indigo { background: var(--indigo-500); }
.grp__pill--teal   { background: var(--teal-500); }
.grp__pill--violet { background: var(--violet-500); }
.grp__pill--slate  { background: var(--slate-400); }
.grp ul { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.grp li {
  font-size: .8125rem; color: var(--text-2);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  padding-left: 14px; position: relative;
}
.grp li::before {
  content: ""; position: absolute; left: 0; top: 50%;
  width: 6px; height: 6px; border-radius: 1px;
  background: var(--border-strong);
  transform: translateY(-50%);
}

@keyframes grp-in {
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Mini overview (used in magic-moment after panel) */
.overview--mini { box-shadow: var(--shadow-md); }
.overview__grid--mini { padding: var(--s-3); gap: var(--s-2); }
.overview__grid--mini .grp { padding: var(--s-3); gap: 0; }

/* ─── Magic Moment: before/after ─── */
.magic { background: var(--surface-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.ba {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-6);
  align-items: stretch;
}
@media (min-width: 920px) {
  .ba { grid-template-columns: 1fr auto 1fr; gap: var(--s-5); }
}
.ba__panel {
  margin: 0;
  display: flex; flex-direction: column; gap: var(--s-3);
  min-width: 0;
}
.ba__cap {
  font-size: .875rem; color: var(--text-2);
  display: flex; align-items: center; gap: var(--s-2);
}
.ba__caplabel {
  font-size: .6875rem; font-weight: 700;
  letter-spacing: .08em; text-transform: uppercase;
  color: var(--text-2); background: var(--surface);
  border: 1px solid var(--border);
  padding: 4px 8px; border-radius: var(--r-sm);
}
.ba__caplabel--accent {
  color: #fff; background: var(--brand-gradient); border-color: transparent;
}
.ba__arrow {
  align-self: center; color: var(--text-3);
  display: flex; align-items: center; justify-content: center;
  padding: 0 var(--s-2);
}
@media (max-width: 919px) {
  .ba__arrow { transform: rotate(90deg); padding: 0; }
}

/* Chrome window mock (Before) */
.chrome {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  position: relative;
}
.chrome__bar {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 12px 0 12px;
  background: var(--surface-alt);
}
.chrome__btn {
  width: 10px; height: 10px; border-radius: 50%;
  flex: 0 0 10px;
}
.chrome__btn--r { background: #ff5f57; }
.chrome__btn--y { background: #febc2e; }
.chrome__btn--g { background: #28c840; }
.chrome__tabs {
  flex: 1;
  display: flex; gap: 2px;
  padding: 0 0 0 8px;
  overflow: hidden;
  position: relative;
  height: 28px;
  align-items: flex-end;
}
.chrome__tabs::after {
  content: ""; position: absolute; right: 0; top: 0; bottom: 0; width: 32px;
  background: linear-gradient(to right, transparent, var(--surface-alt));
}
.tab {
  flex: 0 0 auto;
  height: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  padding: 0 8px;
  display: flex; align-items: center; gap: 6px;
  font-size: 11px; color: var(--text-2);
  white-space: nowrap;
  max-width: 96px;
}
.tab__fav { width: 10px; height: 10px; border-radius: 2px; flex: 0 0 10px; }
.tab__txt { overflow: hidden; text-overflow: ellipsis; }
.chrome__addrbar {
  background: var(--surface-alt);
  padding: 6px 12px 10px 12px;
  border-bottom: 1px solid var(--border);
}
.chrome__addr {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: 6px 12px;
  font-size: 12px; color: var(--text-3);
  font-family: var(--font-mono);
}
.chrome__body {
  padding: var(--s-5);
  display: flex; flex-direction: column; gap: var(--s-3);
  min-height: 140px;
  background: var(--surface);
}
.chrome__skel {
  height: 12px; background: var(--surface-alt); border-radius: 3px;
  width: 100%;
}
.chrome__skel--short { width: 50%; }
.chrome__skel--med   { width: 75%; }

/* ─── Header nav ─── */
.site-nav {
  display: flex; align-items: center; gap: var(--s-5);
}
.site-nav__link {
  display: none;
  font-size: .9375rem; font-weight: 500; color: var(--text-2);
  text-decoration: none;
  transition: color .15s ease;
}
.site-nav__link:hover { color: var(--text); text-decoration: none; }
@media (min-width: 720px) { .site-nav__link { display: inline; } }
.btn--sm {
  padding: 10px 18px; font-size: .9375rem;
  min-height: 40px;
}

/* ─── Pillars ─── */
.pillars__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-5);
}
@media (min-width: 720px) {
  .pillars__grid { grid-template-columns: repeat(3, 1fr); gap: var(--s-6); }
}
.pillar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: var(--s-8) var(--s-6) var(--s-6);
  display: flex; flex-direction: column; gap: var(--s-3);
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.pillar:hover { border-color: var(--border-strong); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.pillar__icon {
  width: 48px; height: 48px;
  border-radius: var(--r-md);
  background: var(--primary-subtle);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--s-2);
}
.pillar__title {
  font-size: 1.1875rem; font-weight: 700;
  letter-spacing: -.01em;
  color: var(--text);
}
.pillar__copy { color: var(--text-2); font-size: 1rem; line-height: 1.55; }

/* ─── How it works ─── */
.steps {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-5);
  counter-reset: step;
}
@media (min-width: 720px) {
  .steps { grid-template-columns: repeat(3, 1fr); gap: var(--s-6); }
}
.step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: var(--s-6);
  display: flex; flex-direction: column; gap: var(--s-3);
  position: relative;
}
.step__num {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--brand-gradient);
  color: #fff;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1rem;
  letter-spacing: 0;
  margin-bottom: var(--s-2);
}
.step__title { font-size: 1.125rem; font-weight: 700; letter-spacing: -.01em; }
.step__copy  { color: var(--text-2); }
.how__cta { margin-top: var(--s-8); }

/* ─── Privacy line ─── */
.privacy { background: var(--surface-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: var(--s-12) 0; }
.privacy__inner { max-width: var(--max-w-narrow); }
.privacy__line { font-size: 1.0625rem; color: var(--text); line-height: 1.6; }
.privacy__line strong { color: var(--text); }

/* ─── Social proof / quote ─── */
.proof .quote {
  margin: 0 auto;
  max-width: 640px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: var(--s-8);
  position: relative;
  box-shadow: var(--shadow-sm);
}
.proof .quote::before {
  content: """;
  position: absolute; top: -24px; left: 24px;
  font-family: Georgia, serif;
  font-size: 96px;
  line-height: 1;
  color: var(--primary);
  opacity: .25;
}
.quote__text p {
  font-size: 1.25rem; font-weight: 500; line-height: 1.45;
  letter-spacing: -.005em;
  color: var(--text);
}
.quote__cite {
  margin-top: var(--s-4);
  font-size: .9375rem; color: var(--text-2);
}
kbd {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .8em;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--text);
  vertical-align: 1px;
}

/* ─── FAQ ─── */
.faq__list { list-style: none; display: flex; flex-direction: column; gap: var(--s-3); max-width: 760px; }
.faq__item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.faq__item:hover { border-color: var(--border-strong); }
.faq__item details { width: 100%; }
.faq__item summary {
  list-style: none;
  cursor: pointer;
  padding: var(--s-5) var(--s-5);
  display: flex; align-items: center; gap: var(--s-4);
  font-size: 1.0625rem; font-weight: 600;
  color: var(--text);
}
.faq__item summary::-webkit-details-marker { display: none; }
.faq__item summary:focus-visible {
  outline: none; box-shadow: var(--focus); border-radius: var(--r-md);
}
.faq__q { flex: 1; }
.faq__chev {
  width: 12px; height: 12px;
  border-right: 2px solid var(--text-2);
  border-bottom: 2px solid var(--text-2);
  transform: rotate(45deg);
  transition: transform .2s ease;
  margin-right: 4px;
  flex: 0 0 12px;
}
.faq__item details[open] .faq__chev { transform: rotate(-135deg); margin-top: 4px; }
.faq__a {
  padding: 0 var(--s-5) var(--s-5);
  color: var(--text-2);
  font-size: 1rem; line-height: 1.6;
}
.faq__a p { max-width: 60ch; }

/* ─── Closing CTA ─── */
.close-cta {
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
  text-align: center;
}
.close-cta__inner { max-width: var(--max-w-narrow); margin: 0 auto; }
.close-cta .lede { margin: var(--s-4) auto 0; }

.waitlist {
  margin: var(--s-8) auto 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-3);
  max-width: 480px;
  text-align: left;
}
@media (min-width: 560px) {
  .waitlist {
    grid-template-columns: 1fr auto;
    align-items: start;
  }
  .waitlist .trust-line { grid-column: 1 / -1; text-align: center; }
  .waitlist__status     { grid-column: 1 / -1; text-align: center; }
}
.waitlist input[type="email"] {
  width: 100%;
  font: inherit;
  font-size: 1rem;
  padding: 14px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  min-height: 48px;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.waitlist input[type="email"]::placeholder { color: var(--text-3); }
.waitlist input[type="email"]:focus-visible { outline: none; border-color: var(--primary); box-shadow: var(--focus); }
.waitlist .btn { width: 100%; }
@media (min-width: 560px) {
  .waitlist .btn { width: auto; }
}
.waitlist__status { font-size: .9375rem; min-height: 1.4em; color: var(--text-2); }
.waitlist__status[data-state="success"] { color: var(--accent); }
.waitlist__status[data-state="error"]   { color: #d12d2d; }

/* ─── Footer ─── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--s-12) 0 var(--s-10);
  background: var(--bg);
}
.site-footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-8);
}
@media (min-width: 720px) {
  .site-footer__inner { grid-template-columns: 1fr auto; align-items: end; }
}
.site-footer__brand { display: flex; flex-direction: column; gap: var(--s-2); }
.site-footer__tagline {
  font-size: .875rem; color: var(--text-2);
  margin-top: var(--s-1);
}
.site-footer__nav {
  display: flex; flex-wrap: wrap; gap: var(--s-5);
  font-size: .9375rem;
}
.site-footer__nav a { color: var(--text-2); }
.site-footer__nav a:hover { color: var(--text); }
.site-footer__row {
  grid-column: 1 / -1;
  border-top: 1px solid var(--border);
  padding-top: var(--s-5);
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s-4);
}
.site-footer__copy { font-size: .875rem; color: var(--text-3); }

.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--r-md);
  cursor: pointer;
  color: var(--text-2);
  transition: color .15s ease, border-color .15s ease, background .15s ease;
}
.theme-toggle:hover { color: var(--text); border-color: var(--border-strong); }
.theme-toggle__sun, .theme-toggle__moon { transition: opacity .2s ease, transform .25s ease; position: absolute; }
.theme-toggle { position: relative; }
:root[data-theme="dark"] .theme-toggle__sun  { opacity: 1; transform: rotate(0); }
:root[data-theme="dark"] .theme-toggle__moon { opacity: 0; transform: rotate(-90deg); }
:root[data-theme="light"] .theme-toggle__sun  { opacity: 0; transform: rotate(90deg); }
:root[data-theme="light"] .theme-toggle__moon { opacity: 1; transform: rotate(0); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .theme-toggle__sun  { opacity: 1; }
  :root:not([data-theme]) .theme-toggle__moon { opacity: 0; }
}
:root:not([data-theme="dark"]):not([data-theme="light"]) .theme-toggle__sun  { opacity: 0; }
:root:not([data-theme="dark"]):not([data-theme="light"]) .theme-toggle__moon { opacity: 1; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="dark"]):not([data-theme="light"]) .theme-toggle__sun  { opacity: 1; }
  :root:not([data-theme="dark"]):not([data-theme="light"]) .theme-toggle__moon { opacity: 0; }
}

/* ─── Hero visual: ZenBrain popup card ─── */
.popup {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  width: 100%;
  max-width: 360px;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(10px);
  animation: popup-in .7s cubic-bezier(.2,.8,.2,1) .2s forwards;
}
@media (prefers-reduced-motion: reduce) { .popup { animation: none; opacity: 1; transform: none; } }
@keyframes popup-in { to { opacity: 1; transform: translateY(0); } }

.popup__chrome {
  display: flex; align-items: center; gap: var(--s-2);
  padding: var(--s-3) var(--s-4);
  border-bottom: 1px solid var(--border);
  background: var(--surface-alt);
}
.popup__dot {
  width: 10px; height: 10px; border-radius: 50%;
}
.popup__dot--r { background: #ff5f57; }
.popup__dot--y { background: #febc2e; }
.popup__dot--g { background: #28c840; }
.popup__chrome-title {
  margin-left: var(--s-2);
  font-size: .8125rem; font-weight: 600; color: var(--text-2);
}
.popup__body {
  padding: var(--s-4) var(--s-5);
  display: flex; flex-direction: column; gap: var(--s-4);
}
.popup__saved-row { display: flex; }
.popup__badge {
  display: inline-flex; align-items: center; gap: var(--s-1);
  font-size: .75rem; font-weight: 600; letter-spacing: .02em;
  color: var(--accent);
  background: rgba(6,182,212,.1);
  border: 1px solid rgba(6,182,212,.25);
  border-radius: var(--r-pill);
  padding: 4px 10px;
}
.popup__session { display: flex; flex-direction: column; gap: var(--s-1); }
.popup__session-title {
  font-size: 1.0625rem; font-weight: 700;
  color: var(--text); letter-spacing: -.01em;
  margin: 0;
}
.popup__session-meta { font-size: .8125rem; color: var(--text-3); margin: 0; }
.popup__tabs {
  list-style: none;
  display: flex; flex-direction: column; gap: 6px;
  margin-top: var(--s-2);
}
.popup__tab {
  display: flex; align-items: center; gap: var(--s-2);
  font-size: .8125rem; color: var(--text-2);
}
.popup__tab-dot {
  width: 8px; height: 8px; border-radius: 50%; flex: 0 0 8px;
}
.popup__tab-txt { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.popup__tab--more {
  font-size: .8125rem; color: var(--text-3); font-style: italic;
  padding-left: calc(8px + var(--s-2));
}
.popup__divider { height: 1px; background: var(--border); }
.popup__recap { display: flex; flex-direction: column; gap: var(--s-2); }
.popup__recap-label {
  font-size: .6875rem; font-weight: 700; letter-spacing: .07em; text-transform: uppercase;
  color: var(--text-3);
}
.popup__recap-text {
  font-size: .9375rem; color: var(--text-2); line-height: 1.5; margin: 0;
  font-style: italic;
}
.popup__export-row {
  display: flex; align-items: center; gap: var(--s-2);
  flex-wrap: wrap;
}
.popup__export-label { font-size: .8125rem; color: var(--text-3); flex: 0 0 auto; }
.popup__export-btn {
  display: inline-flex; align-items: center; gap: var(--s-1);
  font-size: .8125rem; font-weight: 600;
  padding: 8px 12px;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: default; pointer-events: none;
  min-height: 0;
  transition: border-color .15s ease;
}

/* ─── Problem section ─── */
.problem {
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.problem__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s-10);
  align-items: center;
}
@media (min-width: 900px) {
  .problem__inner { grid-template-columns: 1fr 1fr; gap: var(--s-16); }
}
.problem__copy { max-width: 520px; padding-left: var(--s-4); }
@media (min-width: 900px) { .problem__copy { padding-left: var(--s-8); } }
.problem__visual { margin: 0; display: flex; flex-direction: column; gap: var(--s-3); }
.problem__caption {
  font-size: .875rem; color: var(--text-3);
  font-style: italic; text-align: center;
}

/* ─── Integrations ─── */
.integrations { padding-top: 0; }
.integrations__grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-4);
  justify-content: center;
  margin-top: var(--s-8);
}
.integration {
  display: flex; align-items: center; gap: var(--s-3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: var(--s-4) var(--s-6);
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}
.integration:not(.integration--soon):hover {
  border-color: var(--border-strong); transform: translateY(-2px); box-shadow: var(--shadow-sm);
}
.integration--soon { opacity: .55; }
.integration__icon { display: flex; align-items: center; }
.integration__meta { display: flex; flex-direction: column; gap: 3px; }
.integration__name {
  font-size: .9375rem; font-weight: 700; color: var(--text); margin: 0;
  letter-spacing: -.005em;
}
.integration__status {
  font-size: .75rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--text-3); margin: 0;
}

/* ─── Inner pages: /how-it-works, /privacy, /terms ─── */

.page-intro { padding-bottom: 0; }
.page-intro__inner { max-width: var(--max-w-narrow, 640px); }

.neverlist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
  max-width: 640px;
}
.neverlist li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--s-4) var(--s-5);
  display: flex;
  align-items: flex-start;
  gap: var(--s-4);
  font-size: 1rem;
  line-height: 1.5;
}
.neverlist li strong { color: var(--text); font-weight: 600; }
.neverlist li p { margin-top: var(--s-1); color: var(--text-2); font-size: .9375rem; }
.neverlist__icon {
  width: 28px; height: 28px; min-width: 28px;
  border-radius: 50%;
  background: rgba(209, 45, 45, 0.12);
  color: #d12d2d;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.hiw-cta-row { justify-content: center; margin-top: var(--s-8); }

/* Legal prose pages */
.legal-prose {
  max-width: var(--max-w-narrow, 640px);
}
.legal-prose h2 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text);
  margin: var(--s-8) 0 var(--s-2);
  letter-spacing: -.01em;
}
.legal-prose h2:first-child { margin-top: 0; }
.legal-prose p {
  color: var(--text-2);
  font-size: 1rem;
  line-height: 1.65;
  margin: 0 0 var(--s-3);
}
.legal-prose ul {
  color: var(--text-2);
  font-size: 1rem;
  line-height: 1.65;
  margin: 0 0 var(--s-3);
  padding-left: var(--s-6);
}
.legal-prose li { margin-bottom: var(--s-1); }
.legal-prose a { color: var(--accent); text-decoration: underline; }
.integration__status--live { color: var(--accent); }

/* ─── 404 Not Found ─── */
.not-found {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  padding: var(--s-20) 0;
  overflow: hidden;
}
@media (min-width: 720px) { .not-found { min-height: 70vh; } }
.not-found__bg {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  overflow: hidden;
}
.not-found__blob {
  position: absolute;
  top: -30%; left: 50%; transform: translateX(-50%);
  width: 80vw; max-width: 700px; aspect-ratio: 1 / 1;
  background: var(--brand-gradient);
  filter: blur(90px);
  opacity: .18;
  border-radius: 50%;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .not-found__blob { opacity: .3; }
}
:root[data-theme="dark"] .not-found__blob { opacity: .3; }
:root[data-theme="light"] .not-found__blob { opacity: .18; }
.not-found__inner {
  position: relative; z-index: 1;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}
.not-found__code {
  font-size: clamp(6rem, 18vw, 10rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.04em;
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: var(--s-2);
}
@supports not (background-clip: text) {
  .not-found__code { color: var(--primary); background: none; }
}
.not-found__lede {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}
.not-found__ctas { justify-content: center; }