/* ============================================================
   NeuroFlow — Diagnostic Suite shell
   Builds on ../assets/css/styles.css (tokens, fonts, .btn, grain)
   and shares visual DNA with /diagnostic/. Scoped under body.ns.
   ============================================================ */

body.ns {
  --ns-gutter: clamp(16px, 3vw, 36px);
  --ns-maxw: 1320px;
  --ns-num: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --ns-head: 68px;
  background: var(--bg);
  min-height: 100vh;
}
/* Native cursor, as in /diagnostic/. styles.css hides it site-wide with
   `*:not(input):not(textarea):not([contenteditable]) { cursor: none !important }`
   (specificity 0,1,2), so these overrides must be more specific to win. */
@media (hover: hover) and (pointer: fine) {
  html:has(> body.ns), html body.ns, html body.ns *:not(input):not(textarea) { cursor: auto !important; }
  html body.ns a[href], html body.ns a[href] *, html body.ns button:not(:disabled), html body.ns button:not(:disabled) * { cursor: pointer !important; }
}
body.ns .grain { opacity: 0.035; }
.ns em { font-family: 'Playfair Display', serif; font-style: italic; font-weight: 400; }
.ns-wrap { width: 100%; max-width: var(--ns-maxw); margin-inline: auto; padding-inline: var(--ns-gutter); }
.ns-kicker { margin: 0; font-size: 0.7rem; letter-spacing: 0.42em; text-transform: uppercase; color: var(--muted-2); }

/* ---------- Header ---------- */
.ns-top { position: fixed; inset: 0 0 auto 0; z-index: 40; height: var(--ns-head); display: flex; align-items: center; border-bottom: 1px solid transparent; transition: background .4s var(--ease), border-color .4s; }
body[data-view="systems"] .ns-top { background: rgba(0,0,0,0.72); border-bottom-color: var(--line); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); }
.ns-top-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.ns-brand { display: inline-flex; }
.ns-logo { height: 32px; width: auto; display: block; }
.ns-top-label { margin: 0; display: inline-flex; align-items: center; gap: 0.6rem; font-size: 0.7rem; letter-spacing: 0.3em; text-transform: uppercase; color: var(--muted); }
.ns-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 10px rgba(189,75,60,0.7); }

/* ---------- Views ---------- */
body[data-view="hero"] .ns-systems { display: none; }
body[data-view="systems"] .ns-hero { display: none; }

/* ---------- Entrance ---------- */
.ns-hero { position: relative; min-height: 100svh; display: flex; flex-direction: column; justify-content: flex-end; padding-top: calc(var(--ns-head) + 2rem); overflow: hidden; }
.ns-hero::before { /* a single, very soft pool of light — no gradients as decoration elsewhere */
  content: ''; position: absolute; left: 50%; top: 42%; width: min(900px, 110vw); aspect-ratio: 1; transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(255,255,255,0.055), transparent 60%); pointer-events: none;
}
.ns-hero-inner { position: relative; padding-bottom: clamp(3rem, 9vh, 6.5rem); }
.ns-hero-title {
  margin: 1.6rem 0 0; font-family: 'Playfair Display', serif; font-weight: 500;
  font-size: clamp(3.4rem, 12.5vw, 11.5rem); line-height: 0.9; letter-spacing: -0.035em;
}
.ns-line { display: block; overflow: hidden; padding-bottom: 0.2em; margin-bottom: -0.12em; }
.ns-line > span { display: inline-block; }
.ns-hero-title em { padding-left: 0.04em; }
.ns-hero-rule { margin: clamp(1.8rem, 4vh, 2.8rem) 0 1.6rem; height: 1px; width: min(520px, 70%); background: linear-gradient(90deg, var(--signal) 0 56px, var(--border-2) 56px); transform-origin: left; }
.ns-hero-lede { margin: 0; font-family: 'Playfair Display', serif; font-size: clamp(1.25rem, 2.4vw, 1.8rem); line-height: 1.3; color: var(--text); max-width: 26ch; }
.ns-hero-areas { margin: 1rem 0 2.4rem; font-size: 0.92rem; color: var(--muted); letter-spacing: 0.02em; }
.ns-hero-areas span { display: inline-block; white-space: nowrap; }
.ns-hero-areas span:not(:last-child)::after { content: '·'; color: var(--muted-2); margin: 0 0.55rem; }
.ns-enter { padding: 1.05rem 2rem; }

.ns-hero-meta { position: relative; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding-top: 1.2rem; padding-bottom: 1.6rem; font-size: 0.72rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted-2); }
.ns-hero-meta::before { content: ''; position: absolute; top: 0; left: var(--ns-gutter); right: var(--ns-gutter); height: 1px; background: var(--line); }

/* Entrance motion: short, staggered, one-shot */
.ns-in { opacity: 0; transform: translateY(18px); }
.ns-line > .ns-in { transform: translateY(105%); opacity: 1; }
.ns-hero-rule.ns-in { transform: scaleX(0); opacity: 1; }
body.is-ready .ns-in { opacity: 1; transform: none; transition: opacity .8s var(--ease), transform .9s var(--ease); transition-delay: calc(var(--i, 0) * 90ms + 80ms); }
body.is-ready .ns-hero-rule.ns-in { transition-duration: 1.1s; }

/* Leaving the entrance: content lifts away, a red line crosses the frame */
.ns-hero::after { content: ''; position: absolute; left: 0; right: 0; top: 50%; height: 1px; background: var(--signal); transform: scaleX(0); transform-origin: left; opacity: 0.9; }
body.is-leaving .ns-hero-inner, body.is-leaving .ns-hero-meta { opacity: 0; transform: translateY(-22px); transition: opacity .38s var(--ease-soft), transform .45s var(--ease); }
body.is-leaving .ns-hero::after { transform: scaleX(1); transition: transform .5s var(--ease); }
body.is-leaving .ns-systems { opacity: 0; transition: opacity .35s var(--ease-soft); }

/* ---------- Selection ---------- */
.ns-systems { padding-top: calc(var(--ns-head) + clamp(3rem, 8vw, 6rem)); padding-bottom: 4rem; min-height: 100svh; }
.ns-systems-head { display: grid; gap: 1.2rem; max-width: 900px; margin-bottom: clamp(2.8rem, 6vw, 4.5rem); animation: nsUp .7s var(--ease) both; }
.ns-systems-title { margin: 0; font-family: 'Playfair Display', serif; font-weight: 500; font-size: clamp(2.4rem, 6.4vw, 5.4rem); line-height: 0.98; letter-spacing: -0.028em; outline: none; }
.ns-systems-lede { margin: 0; color: var(--muted); font-size: 1.04rem; max-width: 52ch; }

.ns-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--border); }
.ns-row { border-bottom: 1px solid var(--line); animation: nsUp .7s var(--ease) both; animation-delay: calc(var(--i) * 80ms + 120ms); }
.ns-row-inner {
  position: relative; display: grid; align-items: baseline;
  grid-template-columns: 5.5rem minmax(0, 1.15fr) minmax(0, 0.95fr) 11rem;
  gap: 0.6rem 2.4rem; padding: clamp(1.6rem, 3vw, 2.4rem) 0; color: var(--muted); text-decoration: none;
}
.ns-num { font-family: var(--ns-num); font-size: 0.9rem; color: var(--muted-2); letter-spacing: 0.04em; transition: color .4s var(--ease); }
.ns-main { display: grid; gap: 0.55rem; }
.ns-kind { font-size: 0.66rem; letter-spacing: 0.3em; text-transform: uppercase; color: var(--muted-2); }
.ns-title {
  font-family: 'Playfair Display', serif; font-weight: 500; letter-spacing: -0.02em; line-height: 1.02;
  font-size: clamp(2rem, 4.6vw, 3.8rem); color: var(--text); transition: color .4s var(--ease), transform .5s var(--ease);
}
.ns-desc { display: grid; gap: 0.55rem; font-size: 0.98rem; line-height: 1.55; color: var(--muted); max-width: 40ch; }
.ns-format { font-size: 0.76rem; color: var(--muted-2); letter-spacing: 0.02em; }
.ns-action { justify-self: end; align-self: center; }
.ns-cta { display: inline-flex; align-items: center; gap: 0.6rem; font-size: 0.9rem; color: var(--text); padding-bottom: 0.3rem; border-bottom: 1px solid var(--border-2); transition: border-color .4s var(--ease), gap .4s var(--ease); white-space: nowrap; }
.ns-cta svg { transition: transform .4s var(--ease); }
.ns-soon { display: inline-block; font-size: 0.66rem; letter-spacing: 0.26em; text-transform: uppercase; color: var(--muted-2); border: 1px solid var(--border); border-radius: 100px; padding: 0.4rem 0.8rem; white-space: nowrap; }

/* The available system: fuller presence + a red accent line on interaction */
.is-available .ns-row-inner { padding-block: clamp(2.2rem, 4.4vw, 3.4rem); }
.is-available .ns-num { color: var(--signal); }
.is-available .ns-title { font-size: clamp(2.4rem, 6vw, 5rem); }
.is-available .ns-row-inner::before {
  content: ''; position: absolute; top: -1px; left: 0; height: 1px; width: 100%; background: var(--signal);
  transform: scaleX(0.08); transform-origin: left; transition: transform .7s var(--ease);
}
.is-available .ns-row-inner:hover::before, .is-available .ns-row-inner:focus-visible::before { transform: scaleX(1); }
.is-available .ns-row-inner:hover .ns-title, .is-available .ns-row-inner:focus-visible .ns-title { font-style: italic; transform: translateX(0.4rem); }
.is-available .ns-row-inner:hover .ns-cta, .is-available .ns-row-inner:focus-visible .ns-cta { border-color: var(--text); }
.is-available .ns-row-inner:hover .ns-cta svg, .is-available .ns-row-inner:focus-visible .ns-cta svg { transform: translateX(5px); }
.is-available .ns-row-inner:focus-visible { outline: none; }
.is-available .ns-row-inner:focus-visible .ns-title { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 0.18em; }

/* Future systems: present, deliberate, clearly not yet open (hollow type) */
.is-soon .ns-title { color: transparent; -webkit-text-stroke: 1px var(--muted); }
.is-soon .ns-desc { color: var(--muted-2); }
@supports not (-webkit-text-stroke: 1px black) { .is-soon .ns-title { color: var(--muted-2); } }

.ns-systems-foot { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-top: 3rem; }
.ns-back { font-size: 0.82rem; color: var(--muted-2); text-decoration: none; border-bottom: 1px solid transparent; padding-bottom: 0.2rem; transition: color .3s, border-color .3s; }
.ns-back:hover, .ns-back:focus-visible { color: var(--text); border-bottom-color: var(--border-2); }

/* The bigger picture — only rendered once something has been answered. */
.ns-bigger { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 0.8rem 2.4rem; margin-top: clamp(2.4rem, 5vw, 3.6rem); padding-top: clamp(1.6rem, 3vw, 2.2rem); border-top: 1px solid var(--border); animation: nsUp .7s var(--ease) both; animation-delay: 520ms; }
.ns-bigger[hidden] { display: none; }
.ns-bigger .ns-kicker { grid-column: 1 / -1; }
.ns-bigger-lead { margin: 0; grid-column: 1; font-family: 'Playfair Display', serif; font-size: clamp(1.6rem, 3.4vw, 2.6rem); line-height: 1.1; letter-spacing: -0.02em; }
.ns-bigger-basis { margin: 0; grid-column: 1; font-size: 0.86rem; color: var(--muted-2); }
.ns-bigger-link { grid-column: 2; grid-row: 2 / span 2; align-self: center; display: inline-flex; align-items: center; gap: 0.6rem; font-size: 0.9rem; color: var(--text); text-decoration: none; padding-bottom: 0.3rem; border-bottom: 1px solid var(--border-2); white-space: nowrap; transition: border-color .4s var(--ease); }
.ns-bigger-link svg { transition: transform .4s var(--ease); }
.ns-bigger-link:hover, .ns-bigger-link:focus-visible { border-color: var(--signal); }
.ns-bigger-link:hover svg, .ns-bigger-link:focus-visible svg { transform: translateX(5px); }
.ns-bigger-link:focus-visible { outline: 2px solid var(--signal); outline-offset: 4px; }

@keyframes nsUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }

/* ---------- Before we begin ----------
   The prospect's details, once per session. Same editorial language
   as the rest of the Suite: a headline column, underlined fields,
   one thin divider — not a boxed form. */
body[data-view="begin"] .ns-top { background: rgba(0,0,0,0.72); border-bottom-color: var(--line); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); }
body:not([data-view="begin"]) .ns-begin { display: none; }
body[data-view="begin"] .ns-hero, body[data-view="begin"] .ns-systems { display: none; }
body.is-leaving .ns-begin { opacity: 0; transition: opacity .35s var(--ease-soft); }

.ns-begin { padding-top: calc(var(--ns-head) + clamp(3rem, 8vw, 6rem)); padding-bottom: 4rem; min-height: 100svh; }
.ns-begin-inner { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: clamp(2.4rem, 6vw, 6rem); align-items: start; }
.ns-begin-head { display: grid; gap: 1.2rem; animation: nsUp .7s var(--ease) both; }
.ns-begin-title { margin: 0; font-family: 'Playfair Display', serif; font-weight: 500; font-size: clamp(2.4rem, 5.6vw, 4.6rem); line-height: 0.98; letter-spacing: -0.028em; outline: none; }
.ns-begin-lede { margin: 0; color: var(--muted); font-size: 1.02rem; line-height: 1.6; max-width: 44ch; }
.ns-begin-steps { list-style: none; margin: 0.8rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.5rem 1.6rem; font-size: 0.78rem; color: var(--muted-2); }
.ns-begin-steps li { display: inline-flex; gap: 0.55rem; align-items: baseline; }
.ns-begin-steps span { font-family: var(--ns-num); font-size: 0.72rem; color: var(--muted-2); }
.ns-begin-steps li:first-child, .ns-begin-steps li:first-child span { color: var(--text); }
.ns-begin-steps li:first-child span { color: var(--signal); }

.ns-form { border-left: 1px solid var(--border); padding-left: clamp(2rem, 5vw, 4.5rem); animation: nsUp .7s var(--ease) both; animation-delay: 140ms; }
.ns-form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2.2rem 2.4rem; }
.ns-field { display: grid; gap: 0.55rem; align-content: start; }
.ns-field-label { font-size: 0.68rem; letter-spacing: 0.22em; text-transform: uppercase; color: var(--muted-2); }
.ns-field input {
  width: 100%; min-width: 0; background: transparent; border: 0; border-bottom: 1px solid var(--border-2); border-radius: 0; color: var(--text);
  font: inherit; font-family: 'Playfair Display', serif; font-size: 1.45rem; padding: 0.45rem 0 0.6rem; transition: border-color .3s, box-shadow .3s;
}
.ns-field input:focus { outline: none; border-bottom-color: #fff; box-shadow: 0 1px 0 #fff; }
.ns-field input:focus-visible { outline: none; }
.ns-field.is-invalid input { border-bottom-color: var(--signal); box-shadow: 0 1px 0 var(--signal); }
.ns-field-err { min-height: 1.2em; font-size: 0.8rem; color: #e28a7f; }
.ns-hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.ns-form-foot { display: flex; align-items: center; justify-content: space-between; gap: 1.2rem 2rem; flex-wrap: wrap; margin-top: 2.4rem; padding-top: 1.6rem; border-top: 1px solid var(--line); }
.ns-form-note { margin: 0; font-size: 0.8rem; line-height: 1.55; color: var(--muted-2); max-width: 40ch; }
.ns-form-note a { color: var(--muted); text-decoration: underline; text-decoration-color: var(--border-2); text-underline-offset: 0.18em; white-space: nowrap; }
.ns-form-note a:hover, .ns-form-note a:focus-visible { color: var(--text); text-decoration-color: var(--text); }
.ns-continue { padding: 1rem 1.8rem; }
.ns-continue:focus-visible { outline: 2px solid var(--signal); outline-offset: 4px; }
.ns-form-summary { margin: 1rem 0 0; font-size: 0.82rem; color: #e28a7f; min-height: 1.2em; }
.ns-begin .ns-systems-foot { grid-column: 1 / -1; margin-top: 1rem; }

.ns-lead-line { margin: 2.4rem 0 0; font-size: 0.84rem; color: var(--muted-2); display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.3rem 0.6rem; }
.ns-lead-line[hidden] { display: none; }
.ns-lead-line b { color: var(--muted); font-weight: 500; }
.ns-textbtn { background: none; border: 0; padding: 0 0 0.15rem; font: inherit; color: var(--muted); border-bottom: 1px solid var(--border-2); transition: color .3s, border-color .3s; }
.ns-textbtn:hover, .ns-textbtn:focus-visible { color: var(--text); border-bottom-color: var(--text); outline: none; }

/* ---------- Responsive ---------- */
@media (max-width: 1040px) {
  .ns-row-inner { grid-template-columns: 4rem minmax(0, 1fr) auto; }
  .ns-desc { grid-column: 2 / 3; grid-row: 2; }
  .ns-action { grid-column: 3; grid-row: 1 / span 2; }
}
@media (max-width: 640px) {
  body.ns { --ns-head: 60px; }
  .ns-logo { height: 26px; }
  .ns-top-label { font-size: 0.62rem; letter-spacing: 0.24em; }
  .ns-hero-inner { padding-bottom: 2.4rem; }
  .ns-hero-title { font-size: clamp(3.2rem, 17vw, 5rem); }
  .ns-hero-areas { font-size: 0.86rem; line-height: 1.7; }
  .ns-enter { width: 100%; justify-content: center; }
  .ns-hero-meta { font-size: 0.62rem; letter-spacing: 0.16em; }
  .ns-row-inner { grid-template-columns: minmax(0, 1fr) auto; gap: 0.7rem 1rem; }
  .ns-num { grid-column: 1; grid-row: 1; }
  .ns-action { grid-column: 2; grid-row: 1; align-self: baseline; }
  .ns-main { grid-column: 1 / -1; grid-row: 2; }
  .ns-desc { grid-column: 1 / -1; grid-row: 3; }
  .is-available .ns-cta { font-size: 0.86rem; }
  .is-available .ns-row-inner { padding-bottom: 2.2rem; }
  .ns-bigger { grid-template-columns: minmax(0, 1fr); }
  .ns-form-grid { grid-template-columns: minmax(0, 1fr); gap: 1.7rem; }
  .ns-field input { font-size: 1.3rem; }
  .ns-continue { width: 100%; justify-content: center; }
  .ns-bigger-link { grid-column: 1; grid-row: auto; justify-self: start; margin-top: 0.6rem; }
}

@media (max-width: 900px) {
  .ns-begin-inner { grid-template-columns: minmax(0, 1fr); }
  .ns-form { border-left: 0; padding-left: 0; border-top: 1px solid var(--border); padding-top: 2.2rem; }
}

@media (prefers-reduced-motion: reduce) {
  .ns-begin-head, .ns-form { animation: none; }
  .ns-field input, .ns-textbtn { transition: none; }
  .ns-in, .ns-line > .ns-in, .ns-hero-rule.ns-in { opacity: 1; transform: none; transition: none !important; }
  .ns-row, .ns-systems-head, .ns-bigger { animation: none; }
  .ns-bigger-link, .ns-bigger-link svg { transition: none; }
  .ns-title, .ns-cta svg, .is-available .ns-row-inner::before { transition: none; }
}