/* =============================================================================
   BRAINWAVE THEORY — Design System
   Author: front-end build for Robert W. Termanini, MD
   -----------------------------------------------------------------------------
   Hand-authored, zero-framework. Modern platform used deliberately:
   @layer cascade control · @property typed customs · OKLCH + color-mix palette
   fluid type · container queries · :has() · scroll-driven reveals · dark/light.

   COLOR PSYCHOLOGY
   ----------------
   Indigo foundation (near-black, never flat #000) ...... trust, clinical calm, depth
   Bioluminescent cyan .................................. EEG traces, discovery — INTERACTIVITY ONLY
   Ember amber (used rarely) ............................ the human moments: the founder, the book, the CTA
   Violet→magenta edge .................................. members-only rarity
   Cool off-white reading surface ....................... clarity, clinical honesty
   Contrast holds WCAG AA on every pairing. Psychology never excuses illegibility.
   ========================================================================== */

@layer reset, tokens, base, layout, components, utilities, motion;

/* ---------------------------------------------------------------- @property */
/* Typed custom properties so gradients + glows can animate on the compositor. */
@property --wave-shift   { syntax: "<length>"; inherits: false; initial-value: 0px; }
@property --glow         { syntax: "<percentage>"; inherits: false; initial-value: 0%; }
@property --sheen        { syntax: "<angle>"; inherits: false; initial-value: 0deg; }

/* ==========================================================================
   RESET
   ========================================================================== */
@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  * { margin: 0; }
  html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
  body { min-height: 100dvh; line-height: 1.6; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
  img, svg, video, canvas { display: block; max-width: 100%; }
  img, picture { height: auto; }
  input, button, textarea, select { font: inherit; color: inherit; }
  button { background: none; border: none; cursor: pointer; }
  a { color: inherit; text-decoration: none; }
  ul, ol { list-style: none; padding: 0; }
  :focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 4px; }
  /* view-title headings receive programmatic focus for SR announcement only — no ring */
  [data-view-title]:focus, [data-view-title]:focus-visible { outline: none; }
  ::selection { background: var(--cyan); color: var(--ink-950); }
}

/* ==========================================================================
   TOKENS
   ========================================================================== */
@layer tokens {
  :root {
    /* --- Brand primitives (OKLCH with hex fallback via @supports below) --- */
    --ink-950: #050D1C;
    --ink-900: #071226;
    --ink-850: #0A1B33;
    --ink-800: #0E2440;
    --ink-700: #143154;
    --ink-600: #1E4372;

    --cyan-400: #38D6FF;
    --cyan-500: #00B8FF;
    --cyan-600: #00A6F0;
    --cyan:     #00B8FF;

    --amber-300: #F0B565;
    --amber-500: #E5A04C;
    --amber:     #E5A04C;

    --violet-400: #B18CFF;
    --violet-500: #8B5CF6;
    --magenta-500: #C24FD8;

    --paper:   #F5F7FA;
    --paper-2: #EAF0F7;

    /* --- Semantic (DARK is the default brand mode) --- */
    --bg:        var(--ink-900);
    --bg-2:      var(--ink-850);
    --bg-grad-a: var(--ink-800);
    --bg-grad-b: var(--ink-900);
    --bg-grad-c: var(--ink-950);
    --surface:   color-mix(in oklab, var(--ink-850) 82%, var(--cyan) 3%);
    --surface-2: color-mix(in oklab, var(--ink-800) 88%, white 2%);
    --footer-bg: var(--ink-950);

    --text-hi:  #F5F7FA;
    --text-mid: #B7C6DB;
    --text-lo:  #8FA5C0;
    --text-accent: #7FDBFF;

    --line:     color-mix(in oklab, var(--text-lo) 22%, transparent);
    --line-2:   color-mix(in oklab, var(--text-lo) 12%, transparent);
    --nav-bg:   color-mix(in oklab, var(--ink-900) 78%, transparent);
    --menu-bg:  color-mix(in oklab, var(--ink-900) 97%, transparent);

    --accent:   var(--cyan);
    --warm:     var(--amber);
    --members:  var(--violet-400);
    --focus:    var(--cyan-400);

    --glow-cyan: color-mix(in oklab, var(--cyan) 60%, transparent);

    /* --- Typography --- */
    --font-display: "Schibsted Grotesk", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --font-serif:   "Newsreader", ui-serif, Georgia, "Times New Roman", serif;
    --font-mono:    "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

    /* Fluid type scale — 320px → 1600px, ratio ~1.25 */
    --step--1: clamp(0.80rem, 0.77rem + 0.14vw, 0.89rem);
    --step-0:  clamp(1.00rem, 0.95rem + 0.22vw, 1.13rem);
    --step-1:  clamp(1.20rem, 1.10rem + 0.45vw, 1.50rem);
    --step-2:  clamp(1.44rem, 1.27rem + 0.80vw, 2.00rem);
    --step-3:  clamp(1.73rem, 1.45rem + 1.35vw, 2.75rem);
    --step-4:  clamp(2.07rem, 1.62rem + 2.15vw, 3.75rem);
    --step-5:  clamp(2.49rem, 1.75rem + 3.55vw, 5.25rem);
    --step-6:  clamp(2.99rem, 1.75rem + 5.9vw, 7.50rem);

    /* --- Space scale (fluid) --- */
    --space-2xs: clamp(0.5rem, 0.47rem + 0.16vw, 0.625rem);
    --space-xs:  clamp(0.75rem, 0.70rem + 0.24vw, 0.9375rem);
    --space-s:   clamp(1rem, 0.93rem + 0.33vw, 1.25rem);
    --space-m:   clamp(1.5rem, 1.39rem + 0.49vw, 1.875rem);
    --space-l:   clamp(2rem, 1.80rem + 0.98vw, 2.75rem);
    --space-xl:  clamp(3rem, 2.61rem + 1.96vw, 4.5rem);
    --space-2xl: clamp(4rem, 3.32rem + 3.42vw, 7rem);
    --space-3xl: clamp(6rem, 4.80rem + 5.9vw, 10rem);

    /* --- Structure --- */
    --wrap: 1200px;
    --wrap-narrow: 760px;
    --gutter: clamp(20px, 4vw, 48px);

    --r-xs: 8px;   --r-s: 12px;  --r-m: 18px;  --r-l: 26px;  --r-xl: 34px;  --r-pill: 999px;

    --shadow-s: 0 2px 8px rgba(2, 8, 20, .35);
    --shadow-m: 0 12px 34px rgba(2, 8, 20, .45);
    --shadow-l: 0 30px 70px rgba(2, 8, 20, .55);
    --shadow-glow: 0 0 0 1px color-mix(in oklab, var(--cyan) 30%, transparent), 0 18px 50px -12px var(--glow-cyan);

    /* --- Motion — every curve authored, no browser defaults --- */
    --ease-out:   cubic-bezier(.22, .61, .21, 1);
    --ease-inout: cubic-bezier(.62, .04, .18, .97);
    --ease-spring: cubic-bezier(.34, 1.56, .48, 1);
    --dur-1: .18s; --dur-2: .34s; --dur-3: .6s; --dur-4: .9s;

    color-scheme: dark;
  }

  /* --- LIGHT THEME — off-white reading clarity for inner pages --- */
  :root[data-theme="light"] {
    --bg:        var(--paper);
    --bg-2:      var(--paper-2);
    --bg-grad-a: #EAF2FB;
    --bg-grad-b: #DCE8F5;
    --bg-grad-c: #EEF3F9;
    --surface:   #FFFFFF;
    --surface-2: #F2F6FB;
    --footer-bg: #E7ECF3;

    --text-hi:  #0A1B33;
    --text-mid: #33475F;
    --text-lo:  #51647F;
    --text-accent: #0A6E9E;

    --line:     color-mix(in oklab, #33475F 20%, transparent);
    --line-2:   color-mix(in oklab, #33475F 10%, transparent);
    --nav-bg:   color-mix(in oklab, var(--paper) 86%, transparent);
    --menu-bg:  color-mix(in oklab, var(--paper) 97%, transparent);
    --members:  #7A3FD6;
    --accent:   var(--cyan-600);
    --focus:    var(--cyan-600);
    color-scheme: light;
  }

  /* Honor OS preference on first paint (JS re-affirms + persists the choice). */
  @media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]):not([data-theme="light"]) { color-scheme: light; }
  }
}

/* ==========================================================================
   BASE
   ========================================================================== */
@layer base {
  html { scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

  body {
    font-family: var(--font-display);
    font-size: var(--step-0);
    color: var(--text-mid);
    background: var(--bg);
    overflow-x: clip;
    transition: background-color var(--dur-3) var(--ease-out), color var(--dur-3) var(--ease-out);
  }

  h1, h2, h3, h4 {
    color: var(--text-hi);
    line-height: 1.04;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-wrap: balance;
  }
  h1 { font-size: var(--step-6); letter-spacing: -0.035em; }
  h2 { font-size: var(--step-4); }
  h3 { font-size: var(--step-2); }
  p  { text-wrap: pretty; }

  strong { color: var(--text-hi); font-weight: 600; }
  em { font-style: italic; }

  /* Serif is the literary voice — bios, essays, pull-quotes. */
  .serif { font-family: var(--font-serif); font-weight: 400; letter-spacing: 0; }
  /* Mono is the instrument panel — labels, frequencies, data. */
  .mono {
    font-family: var(--font-mono);
    font-size: var(--step--1);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-lo);
    font-weight: 500;
  }

  .eyebrow {
    font-family: var(--font-mono);
    font-size: clamp(0.66rem, 0.62rem + 0.18vw, 0.75rem);
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--text-accent);
    display: inline-flex;
    align-items: center;
    gap: 0.7em;
  }
  .eyebrow::before {
    content: "";
    width: 22px; height: 1px;
    background: linear-gradient(90deg, transparent, var(--cyan));
  }

  .lede {
    font-family: var(--font-serif);
    font-size: var(--step-1);
    line-height: 1.5;
    color: var(--text-mid);
  }

  .warm { color: var(--warm); }
  .accent-text { color: var(--text-accent); }

  a.link {
    color: var(--text-accent);
    position: relative;
    transition: color var(--dur-1) var(--ease-out);
  }
  a.link::after {
    content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 1px;
    background: currentColor; transform: scaleX(0); transform-origin: right;
    transition: transform var(--dur-2) var(--ease-out);
  }
  a.link:hover::after { transform: scaleX(1); transform-origin: left; }

  /* Skip link — keyboard first-class. */
  .skip {
    position: fixed; top: 10px; left: 10px; z-index: 2000;
    background: var(--cyan); color: var(--ink-950);
    padding: 10px 16px; border-radius: var(--r-xs); font-weight: 700;
    transform: translateY(-160%); transition: transform var(--dur-2) var(--ease-out);
  }
  .skip:focus { transform: translateY(0); }
}

/* ==========================================================================
   LAYOUT
   ========================================================================== */
@layer layout {
  .wrap { width: min(100% - var(--gutter) * 2, var(--wrap)); margin-inline: auto; }
  .wrap-narrow { width: min(100% - var(--gutter) * 2, var(--wrap-narrow)); margin-inline: auto; }

  /* Progressive enhancement: with no JS, every view is visible + scrollable
     (crawlable, resilient). Once JS boots, we switch to single-view SPA mode. */
  body.js-ready section[data-view] { display: none; }
  body.js-ready section[data-view].is-active { display: block; }
  body:not(.js-ready) section[data-view] + section[data-view] { border-top: 1px solid var(--line-2); }

  .section { padding-block: var(--space-3xl); position: relative; }
  .section-sm { padding-block: var(--space-2xl); }

  .stack > * + * { margin-top: var(--flow, 1em); }

  /* Custom-property driven auto-grid. */
  .auto-grid {
    display: grid;
    gap: var(--space-m);
    grid-template-columns: repeat(auto-fit, minmax(min(var(--min, 260px), 100%), 1fr));
  }
}

/* ==========================================================================
   COMPONENTS
   ========================================================================== */
@layer components {

  /* ------------------------------------------------------------- Custom cursor
     A dot inside a ring that eases behind the pointer, swells over interactive
     targets, and morphs to a lock over members-only content. Pointer-fine only. */
  #cursor {
    position: fixed; top: 0; left: 0; z-index: 1200;
    width: 40px; height: 40px; margin: -20px 0 0 -20px;
    pointer-events: none; opacity: 0;
    display: grid; place-items: center;
    transition: opacity var(--dur-2) var(--ease-out);
    mix-blend-mode: screen;
  }
  #cursor .cursor__ring {
    position: absolute; inset: 0;
    border: 1.5px solid color-mix(in oklab, var(--cyan) 70%, transparent);
    border-radius: 50%;
    transition: transform var(--dur-2) var(--ease-spring), border-color var(--dur-2) var(--ease-out), background-color var(--dur-2) var(--ease-out);
  }
  #cursor .cursor__dot {
    width: 5px; height: 5px; border-radius: 50%; background: var(--cyan);
    transition: opacity var(--dur-1) var(--ease-out), transform var(--dur-2) var(--ease-spring);
  }
  #cursor .cursor__lock { position: absolute; opacity: 0; transition: opacity var(--dur-1) var(--ease-out); color: var(--members); }
  body.cursor-hover #cursor .cursor__ring { transform: scale(1.55); background: color-mix(in oklab, var(--cyan) 10%, transparent); }
  body.cursor-gated #cursor .cursor__ring { transform: scale(1.7); border-color: var(--members); }
  body.cursor-gated #cursor .cursor__dot { opacity: 0; }
  body.cursor-gated #cursor .cursor__lock { opacity: 1; }
  body.cursor-down #cursor .cursor__ring { transform: scale(.8); }
  @media (hover: none), (pointer: coarse) { #cursor { display: none; } }
  html.has-cursor, html.has-cursor * { cursor: auto; }
  html.has-cursor a, html.has-cursor button, html.has-cursor [role="button"] { cursor: pointer; }
  html.has-cursor input, html.has-cursor textarea, html.has-cursor select { cursor: text; }
  #cursor { display: none !important; }

  /* ------------------------------------------------------------------- Header */
  .site-header { position: fixed; inset: 0 0 auto 0; z-index: 900; }
  .banner {
    font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase;
    text-align: center; padding: 8px 16px; color: #9FD9F5;
    background: linear-gradient(90deg, var(--ink-800), #0A3A55);
    border-bottom: 1px solid color-mix(in oklab, var(--cyan) 18%, transparent);
  }
  .banner b { color: var(--amber); font-weight: 600; }
  .banner button { color: inherit; opacity: .6; padding: 0 4px; transition: opacity var(--dur-1); }
  .banner button:hover { opacity: 1; }

  .nav {
    display: flex; align-items: center; justify-content: space-between; gap: 24px;
    height: 66px; padding-inline: var(--gutter);
    background: var(--nav-bg);
    backdrop-filter: blur(16px) saturate(1.3); -webkit-backdrop-filter: blur(16px) saturate(1.3);
    border-bottom: 1px solid var(--line-2);
    transition: background-color var(--dur-2) var(--ease-out), border-color var(--dur-2);
  }
  .nav__logo { display: inline-flex; align-items: center; gap: 10px; padding: 6px 0; }
  .nav__logo img { height: 24px; width: auto; }
  .nav__logo .logo-light { display: none; }
  :root[data-theme="light"] .nav__logo .logo-dark { display: none; }
  :root[data-theme="light"] .nav__logo .logo-light { display: block; }

  .nav__links { display: flex; align-items: center; gap: 2px; }
  .nav__link {
    color: var(--text-mid); font-size: 14.5px; font-weight: 500;
    padding: 10px 14px; border-radius: var(--r-xs); position: relative;
    transition: color var(--dur-1) var(--ease-out);
  }
  .nav__link:hover, .nav__link[aria-current="page"] { color: var(--text-hi); }
  .nav__link[aria-current="page"]::after {
    content: ""; position: absolute; left: 14px; right: 14px; bottom: 4px; height: 1.5px;
    background: var(--cyan); border-radius: 2px;
  }
  .nav__link--gated { display: inline-flex; align-items: center; gap: 7px; }
  .nav__link--gated:hover { color: var(--members); }
  .nav__link--gated[data-tooltip]::before {
    content: attr(data-tooltip); position: absolute; left: 50%; top: calc(100% + 8px); transform: translate(-50%, -4px);
    padding: 5px 8px; border: 1px solid var(--line); border-radius: 7px; background: var(--surface);
    color: var(--text-mid); font-family: var(--font-mono); font-size: 10px; letter-spacing: .06em; white-space: nowrap;
    opacity: 0; visibility: hidden; pointer-events: none; box-shadow: var(--shadow-m); transition: opacity var(--dur-1), transform var(--dur-1), visibility var(--dur-1); z-index: 20;
  }
  .nav__link--gated[data-tooltip]:hover::before, .nav__link--gated[data-tooltip]:focus-visible::before { opacity: 1; visibility: visible; transform: translate(-50%, 0); }

  .nav__actions { display: flex; align-items: center; gap: 10px; }
  .theme-toggle {
    display: grid; place-items: center; width: 38px; height: 38px;
    border: 1px solid var(--line); border-radius: var(--r-pill); color: var(--text-accent);
    transition: border-color var(--dur-1), transform var(--dur-2) var(--ease-spring);
  }
  .theme-toggle:hover { border-color: var(--cyan); transform: rotate(18deg); }
  .theme-toggle .icon-sun { display: none; }
  :root[data-theme="light"] .theme-toggle .icon-moon { display: none; }
  :root[data-theme="light"] .theme-toggle .icon-sun { display: block; }

  .nav__burger { display: none; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 10px; place-items: center; color: var(--text-mid); }

  /* -------------------------------------------------------------- Mobile menu */
  .menu { position: fixed; inset: 0; z-index: 950; background: var(--menu-bg); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); padding: 24px var(--gutter); display: flex; flex-direction: column; }
  .menu[hidden] { display: none; }
  .menu__top { display: flex; justify-content: flex-end; }
  .menu__members-label { display: inline-flex; margin-left: 8px; padding: 3px 7px; border: 1px solid color-mix(in oklab, var(--violet-400) 40%, transparent); border-radius: var(--r-pill); color: var(--members); font-family: var(--font-mono); font-size: 9px; letter-spacing: .08em; text-transform: uppercase; vertical-align: middle; }
  .menu__close { width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 10px; color: var(--text-mid); font-size: 20px; }
  .menu__links { display: flex; flex-direction: column; gap: 2px; margin-top: 28px; }
  .menu__links a { color: var(--text-hi); font-size: clamp(1.6rem, 8vw, 2rem); font-weight: 700; padding: 12px 4px; letter-spacing: -0.02em; }
  .menu__links a.is-members { color: var(--members); }

  /* ------------------------------------------------------------------ Buttons */
  .btn {
    --btn-bg: var(--surface-2);
    --btn-fg: var(--text-hi);
    position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 9px;
    padding: 12px 22px; border-radius: var(--r-pill); font-weight: 600; font-size: 14.5px;
    color: var(--btn-fg); background: var(--btn-bg);
    border: 1px solid transparent; isolation: isolate; overflow: hidden;
    transition: transform var(--dur-2) var(--ease-spring), box-shadow var(--dur-2) var(--ease-out), background-color var(--dur-2), color var(--dur-2);
    will-change: transform;
  }
  .btn::before { /* sheen sweep */
    content: ""; position: absolute; inset: 0; z-index: -1; opacity: 0;
    background: linear-gradient(var(--sheen), transparent 40%, color-mix(in oklab, white 55%, transparent) 50%, transparent 60%);
    transition: opacity var(--dur-2) var(--ease-out);
  }
  .btn:hover::before { opacity: .5; animation: sheen 1s var(--ease-out); }
  .btn--primary { --btn-bg: var(--amber); --btn-fg: #20150A; font-weight: 700; }
  .btn--primary:hover { --btn-bg: var(--amber-300); box-shadow: 0 12px 32px -10px color-mix(in oklab, var(--amber) 65%, transparent); }
  .btn--cyan { --btn-bg: transparent; --btn-fg: var(--text-accent); border-color: color-mix(in oklab, var(--cyan) 45%, transparent); }
  .btn--cyan:hover { --btn-bg: color-mix(in oklab, var(--cyan) 12%, transparent); box-shadow: var(--shadow-glow); }
  .btn--ghost { --btn-bg: transparent; --btn-fg: var(--text-mid); border-color: var(--line); }
  .btn--ghost:hover { --btn-fg: var(--text-hi); border-color: var(--cyan); }
  .btn--members { --btn-bg: color-mix(in oklab, var(--violet-500) 16%, transparent); --btn-fg: var(--violet-400); border: 1px solid color-mix(in oklab, var(--violet-400) 45%, transparent); }
  .btn--members:hover { --btn-bg: color-mix(in oklab, var(--violet-500) 26%, transparent); box-shadow: 0 14px 40px -14px color-mix(in oklab, var(--magenta-500) 70%, transparent); }
  .btn--lg { padding: 15px 30px; font-size: 15.5px; }
  .btn:active { transform: scale(.97); }
  .btn[disabled] { opacity: .55; cursor: not-allowed; }

  .arrow-link {
    display: inline-flex; align-items: center; gap: 8px; font-weight: 600; color: var(--text-accent);
    font-size: 14.5px;
  }
  .arrow-link svg { transition: transform var(--dur-2) var(--ease-out); }
  .arrow-link:hover svg { transform: translateX(5px); }
  .arrow-link.is-members { color: var(--members); }

  /* --------------------------------------------------------------------- Hero */
  .hero { position: relative; min-height: 100svh; display: grid; align-items: center; overflow: clip; isolation: isolate; container-type: inline-size; }
  .cq { container-type: inline-size; }
  .hero__stage { position: absolute; inset: 0; z-index: -3; background:
      radial-gradient(120% 90% at 78% 8%, var(--bg-grad-a), transparent 55%),
      radial-gradient(120% 120% at 12% 100%, color-mix(in oklab, var(--ink-800) 80%, var(--cyan) 6%), transparent 60%),
      linear-gradient(180deg, var(--bg-grad-b), var(--bg-grad-c)); }
  .hero__canvas { position: absolute; inset: 0; z-index: -2; width: 100%; height: 100%; opacity: 0; transition: opacity 1.2s var(--ease-out); }
  .hero__canvas.is-live { opacity: 1; }
  .hero__veil { position: absolute; inset: 0; z-index: -1; pointer-events: none;
    background: radial-gradient(90% 70% at 30% 60%, transparent 40%, color-mix(in oklab, var(--ink-900) 62%, transparent) 100%); }
  :root[data-theme="light"] .hero__veil { background: radial-gradient(90% 70% at 30% 60%, transparent 30%, color-mix(in oklab, var(--paper) 60%, transparent) 100%); }

  .hero__content { padding-block: clamp(120px, 16vh, 200px) var(--space-2xl); }
  .hero__grid { display: grid; gap: var(--space-l); grid-template-columns: minmax(0, 1fr); }
  @container (min-width: 900px) { .hero__grid { grid-template-columns: 1.35fr 1fr; align-items: center; } }

  .hero h1 { margin-top: .35em; }
  .hero h1 .rise { display: inline-block; }
  .hero__lede { max-width: 32ch; margin-top: var(--space-m); font-size: var(--step-1); }
  .hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: var(--space-l); }

  /* live EEG trace panel, right of hero */
  .eeg-panel { position: relative; border: 1px solid var(--line); border-radius: var(--r-l); padding: 18px; background: color-mix(in oklab, var(--ink-850) 40%, transparent); backdrop-filter: blur(6px); box-shadow: var(--shadow-m); }
  .eeg-panel__label { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
  .eeg-panel__dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 0 var(--glow-cyan); animation: pulse 2.4s var(--ease-inout) infinite; }
  .eeg-panel canvas { width: 100%; height: 132px; border-radius: var(--r-s); }
  .hero__bands { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
  .band-chip { font-family: var(--font-mono); font-size: 11px; letter-spacing: .06em; color: var(--text-lo); border: 1px solid var(--line-2); border-radius: var(--r-pill); padding: 6px 11px; }
  .band-chip b { color: var(--text-accent); font-weight: 600; }

  .hero__scroll { position: absolute; left: 50%; bottom: 26px; translate: -50% 0; display: flex; flex-direction: column; align-items: center; gap: 8px; color: var(--text-lo); font-family: var(--font-mono); font-size: 10px; letter-spacing: .3em; }
  .hero__scroll span { width: 1px; height: 40px; background: linear-gradient(var(--text-lo), transparent); overflow: hidden; }
  .hero__scroll span::after { content: ""; display: block; width: 100%; height: 14px; background: var(--cyan); animation: scrolldot 2.2s var(--ease-inout) infinite; }

  /* ------------------------------------------------------------ Wave dividers */
  .divider-wave { display: block; width: 100%; height: clamp(40px, 6vw, 90px); color: var(--surface); }
  .divider-wave path { fill: currentColor; }

  /* -------------------------------------------------------------- Section head */
  .sec-head { max-width: 62ch; margin-bottom: var(--space-xl); }
  .sec-head h2 { margin-top: .5em; }
  .sec-head p { margin-top: var(--space-s); font-size: var(--step-1); color: var(--text-mid); }
  .sec-head .sec-head__clarifier { font-size: 1rem; max-width: 48ch; }
  .sec-head--center { margin-inline: auto; text-align: center; }
  .sec-head--center .eyebrow::before { display: none; }

  /* ----------------------------------------------------------------- The Idea */
  .steps { counter-reset: step; display: grid; gap: var(--space-m); grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr)); }
  .step { position: relative; padding: var(--space-l) var(--space-m); border: 1px solid var(--line-2); border-radius: var(--r-l); background: color-mix(in oklab, var(--surface) 55%, transparent); overflow: hidden; }
  .step__n { font-family: var(--font-mono); font-size: 12px; letter-spacing: .2em; color: var(--text-accent); }
  .step h3 { font-size: var(--step-2); margin: 12px 0; }
  .step p { color: var(--text-mid); }
  .step__wave { position: absolute; inset: auto 0 0 0; height: 3px; background: linear-gradient(90deg, transparent, var(--cyan), transparent); transform: scaleX(0); transform-origin: left; transition: transform var(--dur-4) var(--ease-out); }
  .step.is-visible .step__wave { transform: scaleX(1); }

  /* ---------------------------------------------------------------- Band lab */
  .band-lab { display: grid; gap: var(--space-l); grid-template-columns: 1fr; align-items: start; }
  @container (min-width: 820px) { .band-lab { grid-template-columns: 300px 1fr; } }
  .band-tabs { display: flex; flex-direction: row; flex-wrap: wrap; gap: 8px; }
  @container (min-width: 820px) { .band-tabs { flex-direction: column; } }
  .band-tab {
    flex: 1 1 auto; text-align: left; display: flex; align-items: baseline; justify-content: space-between; gap: 10px;
    padding: 14px 16px; border: 1px solid var(--line-2); border-radius: var(--r-m); color: var(--text-mid);
    transition: border-color var(--dur-2), background-color var(--dur-2), color var(--dur-2), transform var(--dur-2) var(--ease-out);
  }
  .band-tab .greek { font-family: var(--font-serif); font-size: 1.3em; color: var(--text-hi); }
  .band-tab .hz { font-family: var(--font-mono); font-size: 11px; color: var(--text-lo); }
  .band-tab:hover { border-color: var(--line); transform: translateX(3px); }
  .band-tab[aria-selected="true"] { border-color: color-mix(in oklab, var(--cyan) 55%, transparent); background: color-mix(in oklab, var(--cyan) 9%, transparent); color: var(--text-hi); box-shadow: var(--shadow-glow); }
  .band-tab[aria-selected="true"] .hz { color: var(--text-accent); }

  .band-panel { border: 1px solid var(--line-2); border-radius: var(--r-l); overflow: hidden; background: color-mix(in oklab, var(--surface) 60%, transparent); }
  .band-viz { width: 100%; height: clamp(160px, 26vw, 240px); background: linear-gradient(180deg, color-mix(in oklab, var(--ink-900) 30%, transparent), transparent); }
  :root[data-theme="light"] .band-viz { background: linear-gradient(180deg, color-mix(in oklab, var(--paper-2) 60%, transparent), transparent); }
  .band-panel__body { padding: var(--space-m) var(--space-l) var(--space-l); }
  .band-panel__title { display: flex; align-items: baseline; gap: 12px; margin-bottom: 10px; }
  .band-panel__title h3 { font-size: var(--step-2); }
  .band-panel__title .hz { font-family: var(--font-mono); font-size: 13px; color: var(--text-accent); }
  .band-panel__body p { color: var(--text-mid); max-width: 60ch; }

  /* ---------------------------------------------------------------- Card / tilt */
  .card {
    position: relative; padding: var(--space-l); border: 1px solid var(--line-2); border-radius: var(--r-l);
    background: color-mix(in oklab, var(--surface) 62%, transparent); overflow: hidden;
    transform-style: preserve-3d; transition: border-color var(--dur-2) var(--ease-out), box-shadow var(--dur-3) var(--ease-out);
  }
  .card::after { /* pointer-tracked specular highlight */
    content: ""; position: absolute; inset: 0; opacity: 0; pointer-events: none; transition: opacity var(--dur-2);
    background: radial-gradient(240px circle at var(--mx, 50%) var(--my, 0%), color-mix(in oklab, var(--cyan) 16%, transparent), transparent 60%);
  }
  .card:hover { border-color: var(--line); box-shadow: var(--shadow-l); }
  .card:hover::after { opacity: 1; }
  .card__k { font-family: var(--font-mono); font-size: 11px; letter-spacing: .18em; color: var(--text-accent); }
  .card h3 { font-size: var(--step-1); margin: 10px 0; }
  .card p { color: var(--text-mid); }
  .card--feature { min-height: 280px; padding-top: calc(var(--space-l) + 4px); border-color: color-mix(in oklab, var(--cyan) 22%, var(--line-2)); box-shadow: 0 18px 46px -38px color-mix(in oklab, var(--cyan) 55%, transparent); }
  .card--feature::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 3px; background: linear-gradient(180deg, var(--cyan), transparent 76%); opacity: .75; }
  .card__icon { width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 18px; border: 1px solid color-mix(in oklab, var(--cyan) 35%, var(--line)); border-radius: 12px; background: color-mix(in oklab, var(--cyan) 8%, var(--surface)); color: var(--text-accent); }
  .card__icon svg { width: 22px; height: 22px; }

  /* -------------------------------------------------------- Members lock cards */
  .lockcard { position: relative; border: 1px solid color-mix(in oklab, var(--violet-400) 24%, transparent); border-radius: var(--r-l); padding: var(--space-l); background: color-mix(in oklab, var(--violet-500) 7%, var(--surface)); overflow: hidden; }
  .lockcard__body { filter: blur(0.4px); }
  .lockcard__k { font-family: var(--font-mono); font-size: 11px; letter-spacing: .18em; color: var(--members); }
  .lockcard h3 { font-size: var(--step-1); margin: 10px 0; }
  .lockcard p { color: var(--text-mid); -webkit-mask-image: linear-gradient(180deg, #000 30%, transparent); mask-image: linear-gradient(180deg, #000 40%, transparent); }
  .lock-badge { display: inline-flex; align-items: center; gap: 7px; margin-top: 18px; font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--members); border: 1px solid color-mix(in oklab, var(--violet-400) 40%, transparent); border-radius: var(--r-pill); padding: 6px 12px; }
  .lockcard::before { content: ""; position: absolute; inset: 0; background: linear-gradient(160deg, transparent 55%, color-mix(in oklab, var(--magenta-500) 10%, transparent)); pointer-events: none; }

  /* ----------------------------------------------------------------- Portrait */
  .portrait { position: relative; width: min(340px, 80vw); aspect-ratio: 1; margin-inline: auto; border-radius: 50%; overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow-l); }
  .portrait img { width: 100%; height: 100%; object-fit: cover; }
  .portrait--about img { object-position: 50% 18%; }
  .portrait::after { content: ""; position: absolute; inset: 0; border-radius: 50%; box-shadow: inset 0 0 60px color-mix(in oklab, var(--ink-900) 60%, transparent); }
  .portrait-ring { position: absolute; inset: -14px; border-radius: 50%; border: 1px dashed color-mix(in oklab, var(--cyan) 30%, transparent); animation: spin 40s linear infinite; }

  .credo { display: flex; flex-wrap: wrap; gap: 10px; margin-top: var(--space-m); }
  .credo li { font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em; color: var(--text-mid); border: 1px solid var(--line-2); border-radius: var(--r-pill); padding: 8px 14px; }
  .credo li b { color: var(--text-accent); font-weight: 600; }

  /* -------------------------------------------------------------- Pull quote */
  .pullquote { position: relative; padding: var(--space-l) 0 var(--space-l) var(--space-l); border-left: 2px solid var(--cyan); }
  .pullquote blockquote { font-family: var(--font-serif); font-size: var(--step-2); line-height: 1.35; color: var(--text-hi); font-style: italic; }
  .pullquote cite { display: block; margin-top: var(--space-s); font-family: var(--font-mono); font-size: 12px; letter-spacing: .16em; color: var(--text-accent); font-style: normal; }

  /* ---------------------------------------------------------- Frequency table */
  .table-wrap { border: 1px solid var(--line-2); border-radius: var(--r-l); overflow: hidden; }
  table.freq { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
  table.freq caption { text-align: left; padding: var(--space-m) var(--space-l) 0; font-family: var(--font-mono); font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--text-accent); }
  table.freq th, table.freq td { text-align: left; padding: 14px var(--space-l); border-bottom: 1px solid var(--line-2); }
  table.freq thead th { font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--text-lo); font-weight: 500; }
  table.freq tbody th { color: var(--text-hi); font-weight: 600; }
  table.freq tbody th .greek { font-family: var(--font-serif); color: var(--text-accent); margin-right: 4px; }
  table.freq td { color: var(--text-mid); }
  table.freq tr:last-child th, table.freq tr:last-child td { border-bottom: none; }
  table.freq tbody tr { transition: background-color var(--dur-1); }
  table.freq tbody tr:hover { background: color-mix(in oklab, var(--cyan) 6%, transparent); }

  /* ----------------------------------------------------------------- FAQ */
  .faq { border-top: 1px solid var(--line-2); }
  .faq details { border-bottom: 1px solid var(--line-2); }
  .faq summary { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: var(--space-m) 0; font-size: var(--step-1); color: var(--text-hi); font-weight: 600; list-style: none; }
  .faq summary::-webkit-details-marker { display: none; }
  .faq summary .plus { position: relative; flex: none; width: 20px; height: 20px; }
  .faq summary .plus::before, .faq summary .plus::after { content: ""; position: absolute; inset: 0; margin: auto; background: var(--cyan); transition: transform var(--dur-2) var(--ease-out); }
  .faq summary .plus::before { width: 20px; height: 2px; }
  .faq summary .plus::after { width: 2px; height: 20px; }
  .faq details[open] summary .plus::after { transform: scaleY(0); }
  .faq details p { padding: 0 0 var(--space-m); color: var(--text-mid); max-width: 68ch; }

  /* ---------------------------------------------------------------- Journal */
  .posts { display: grid; gap: var(--space-m); }
  .post { display: grid; gap: 6px; padding: var(--space-l) 0; border-top: 1px solid var(--line-2); transition: background-color var(--dur-2); position: relative; }
  .post:hover { --my: 0; }
  .post__meta { font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em; color: var(--text-accent); }
  .post h3 { font-size: var(--step-2); transition: color var(--dur-1); }
  .post:hover h3 { color: var(--text-accent); }
  .post p { color: var(--text-mid); max-width: 68ch; }

  /* article reader (journal modal/view) */
  .article { max-width: 68ch; }
  .article p { margin-top: var(--space-m); font-family: var(--font-serif); font-size: var(--step-1); line-height: 1.7; color: var(--text-mid); }
  .article .dropcap::first-letter { font-family: var(--font-serif); font-size: 3.4em; float: left; line-height: .8; padding: 6px 10px 0 0; color: var(--text-accent); }

  /* ------------------------------------------------------------------- Tiers */
  .tier-grid { display: grid; gap: var(--space-m); grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr)); align-items: stretch; }
  .tier { position: relative; display: flex; flex-direction: column; padding: var(--space-l); border: 1px solid var(--line-2); border-radius: var(--r-l); background: color-mix(in oklab, var(--surface) 55%, transparent); }
  .tier--featured { border-color: color-mix(in oklab, var(--violet-400) 45%, transparent); background: color-mix(in oklab, var(--violet-500) 8%, var(--surface)); box-shadow: 0 24px 60px -30px color-mix(in oklab, var(--magenta-500) 60%, transparent); }
  .tier__flag { position: absolute; top: -11px; left: var(--space-l); font-family: var(--font-mono); font-size: 10px; letter-spacing: .16em; text-transform: uppercase; color: #170A24; background: linear-gradient(90deg, var(--violet-400), var(--magenta-500)); padding: 5px 12px; border-radius: var(--r-pill); }
  .tier__name { font-family: var(--font-mono); font-size: 12px; letter-spacing: .18em; text-transform: uppercase; color: var(--text-accent); }
  .tier--featured .tier__name { color: var(--members); }
  .tier__price { font-size: var(--step-3); color: var(--text-hi); margin: 12px 0 4px; letter-spacing: -0.02em; }
  .tier__price small { font-size: .42em; color: var(--text-lo); font-weight: 500; letter-spacing: 0; }
  .tier ul { display: grid; gap: 10px; margin: var(--space-m) 0 var(--space-l); }
  .tier ul li { display: flex; gap: 10px; color: var(--text-mid); font-size: 14.5px; }
  .tier ul li svg { flex: none; margin-top: 3px; color: var(--cyan); }
  .tier--featured ul li svg { color: var(--members); }
  .tier .btn { margin-top: auto; width: 100%; }

  /* -------------------------------------------------------------------- Forms */
  .form { display: grid; gap: var(--space-s); }
  .field { display: grid; gap: 7px; }
  .field label { font-family: var(--font-mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--text-lo); }
  .input, .textarea {
    width: 100%; padding: 13px 15px; color: var(--text-hi);
    background: color-mix(in oklab, var(--ink-900) 30%, transparent);
    border: 1px solid var(--line); border-radius: var(--r-s);
    transition: border-color var(--dur-1), box-shadow var(--dur-2);
  }
  :root[data-theme="light"] .input, :root[data-theme="light"] .textarea { background: #fff; }
  .input::placeholder, .textarea::placeholder { color: color-mix(in oklab, var(--text-lo) 75%, transparent); }
  .input:focus, .textarea:focus { outline: none; border-color: var(--cyan); box-shadow: 0 0 0 3px color-mix(in oklab, var(--cyan) 20%, transparent); }
  .textarea { resize: vertical; min-height: 130px; }
  .field[data-invalid] .input, .field[data-invalid] .textarea { border-color: #FF6B7A; }
  .field__err { font-size: 12px; color: #FF8A95; min-height: 1em; }
  .form__success { display: flex; align-items: center; gap: 12px; padding: var(--space-m); border: 1px solid color-mix(in oklab, var(--cyan) 40%, transparent); border-radius: var(--r-m); background: color-mix(in oklab, var(--cyan) 8%, transparent); color: var(--text-hi); }
  .form__success svg { flex: none; color: var(--cyan); }

  .contact-cols { display: grid; gap: var(--space-xl); grid-template-columns: 1fr; }
  @container (min-width: 780px) { .contact-cols { grid-template-columns: 0.8fr 1fr; } }
  .contact-item { padding: var(--space-m) 0; border-top: 1px solid var(--line-2); }
  .contact-item .mono { display: block; margin-bottom: 4px; }
  .contact-item a, .contact-item span { font-size: var(--step-1); color: var(--text-hi); }

  /* modal */
  dialog.modal { width: min(560px, 92vw); border: 1px solid var(--line); border-radius: var(--r-l); background: var(--surface); color: var(--text-mid); padding: 0; box-shadow: var(--shadow-l); }
  dialog.modal::backdrop { background: color-mix(in oklab, var(--ink-950) 70%, transparent); backdrop-filter: blur(4px); }
  dialog.modal[data-wide] { width: min(760px, 94vw); }
  .modal__in { padding: var(--space-l); }
  .modal__close { position: absolute; top: 14px; right: 14px; width: 38px; height: 38px; border: 1px solid var(--line); border-radius: var(--r-pill); color: var(--text-mid); display: grid; place-items: center; }

  /* --------------------------------------------------------------- Footer */
  .footer { background: var(--footer-bg); border-top: 1px solid var(--line-2); padding-block: var(--space-xl) var(--space-l); margin-top: 0; container-type: inline-size; }
  .footer__grid { display: grid; gap: var(--space-l); grid-template-columns: 1fr; }
  @container (min-width: 720px) { .footer__grid { grid-template-columns: 1.6fr 1fr 1fr 1.2fr; } }
  .footer__brand img { height: 26px; margin-bottom: var(--space-s); }
  .footer__brand p { color: var(--text-lo); max-width: 34ch; font-size: 14px; }
  .footer__col h4 { font-family: var(--font-mono); font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--text-lo); font-weight: 500; margin-bottom: 14px; }
  .footer__col a { display: block; padding: 6px 0; color: var(--text-mid); font-size: 14.5px; transition: color var(--dur-1); }
  .footer__col a:hover { color: var(--text-accent); }
  .footer__bar { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; align-items: center; margin-top: var(--space-xl); padding-top: var(--space-m); border-top: 1px solid var(--line-2); color: var(--text-lo); font-size: 13px; }
  .footer__status { display: inline-flex; align-items: center; gap: 8px; }
  .footer__status .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 0 0 color-mix(in oklab, var(--amber) 60%, transparent); animation: pulse 2.6s var(--ease-inout) infinite; }
}

/* ==========================================================================
   UTILITIES
   ========================================================================== */
@layer utilities {
  .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
  [hidden] { display: none !important; }
  .no-wrap { white-space: nowrap; }
  .measure { max-width: 66ch; }
  .mt-l { margin-top: var(--space-l); }
  .mt-xl { margin-top: var(--space-xl); }
  .center { text-align: center; }
}

/* ==========================================================================
   MOTION  — reveal-on-scroll, honoring reduced-motion. Transforms/opacity only.
   ========================================================================== */
@layer motion {
  [data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity var(--dur-3) var(--ease-out), transform var(--dur-3) var(--ease-out); }
  [data-reveal].is-visible { opacity: 1; transform: none; }
  [data-reveal][data-reveal="fade"] { transform: none; }
  [data-reveal-delay="1"] { transition-delay: .08s; }
  [data-reveal-delay="2"] { transition-delay: .16s; }
  [data-reveal-delay="3"] { transition-delay: .24s; }
  [data-reveal-delay="4"] { transition-delay: .32s; }

  @keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 var(--glow-cyan); } 50% { box-shadow: 0 0 0 6px transparent; } }
  @keyframes spin { to { transform: rotate(360deg); } }
  @keyframes scrolldot { 0% { transform: translateY(-14px); } 100% { transform: translateY(40px); } }
  @keyframes sheen { from { --sheen: 0deg; } to { --sheen: 360deg; } }
  @keyframes float-y { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }

  /* View Transitions — soft cross-fade + lift between routed views. */
  ::view-transition-old(root) { animation: vt-out .28s var(--ease-inout) both; }
  ::view-transition-new(root) { animation: vt-in .42s var(--ease-out) both; }
  @keyframes vt-out { to { opacity: 0; transform: translateY(-8px); } }
  @keyframes vt-in { from { opacity: 0; transform: translateY(14px); } }

  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
    [data-reveal] { opacity: 1 !important; transform: none !important; }
    ::view-transition-old(root), ::view-transition-new(root) { animation: none; }
    .portrait-ring, .hero__scroll span::after { animation: none; }
  }
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 960px) {
  .nav__links { display: none; }
  .nav__burger { display: grid; }
  .nav .btn--primary, .nav .theme-toggle { display: none; }
}
@media (min-width: 961px) { .menu { display: none; } }

@media (max-width: 620px) {
  .hero__scroll { display: none; }
  .card--feature { min-height: 0; }
  .portrait--about { width: min(340px, 88vw) !important; }
  .banner { font-size: 10.5px; }
  .pullquote { padding-left: var(--space-m); }
}



/* Production usability and interaction restoration */
#hero-canvas, #eeg-canvas, #band-viz { min-height: 120px; }
.eeg-panel, .band-panel { background-image: radial-gradient(circle at 20% 20%, color-mix(in oklab, var(--cyan) 10%, transparent), transparent 38%); }
.card[data-tilt] { position: relative; overflow: hidden; transition: transform .28s ease, border-color .28s ease, box-shadow .28s ease; }
.card[data-tilt]::after { content: ''; position: absolute; inset: auto 18px 16px 18px; height: 2px; opacity: .55; background: linear-gradient(90deg, transparent, var(--cyan), transparent); transform: scaleX(.35); transition: transform .35s ease, opacity .35s ease; }
.card[data-tilt]:hover::after, .card[data-tilt]:focus-within::after { transform: scaleX(1); opacity: .9; }
.card[data-tilt]:hover { border-color: color-mix(in oklab, var(--cyan) 44%, var(--line)); box-shadow: 0 18px 44px color-mix(in oklab, var(--cyan) 10%, transparent); }
@media (max-width: 720px) { .card[data-tilt] { transform: none !important; } #hero-canvas, #eeg-canvas, #band-viz { min-height: 96px; } }

/* ============================================================ */
/* RHYTHM PRISM — shader gallery controls                        */
/* ============================================================ */
.prism-lab { display: grid; gap: var(--space-l); grid-template-columns: 1fr; align-items: start; }
@container (min-width: 820px) { .prism-lab { grid-template-columns: 1fr 300px; } }

.prism-canvas-wrap {
  position: relative; border: 1px solid var(--line-2); border-radius: var(--r-l);
  overflow: hidden; background: color-mix(in oklab, var(--surface) 60%, transparent);
  aspect-ratio: 16/10; min-height: 220px;
}
.prism-canvas-wrap canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

.prism-badge {
  position: absolute; top: 14px; left: 14px; font-size: 10px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--text-accent);
  background: color-mix(in oklab, var(--ink-950, #05070c) 55%, transparent);
  border: 1px solid color-mix(in oklab, var(--cyan) 45%, transparent);
  border-radius: var(--r-pill); padding: 5px 10px; backdrop-filter: blur(6px);
}
.prism-mode-row {
  position: absolute; bottom: 14px; left: 14px; right: 14px;
  display: flex; align-items: center; justify-content: center; gap: 12px;
}
.prism-mode-name {
  min-width: 130px; text-align: center; font-size: 11px; letter-spacing: .05em; color: var(--text-hi);
  background: color-mix(in oklab, var(--ink-950, #05070c) 55%, transparent);
  border: 1px solid var(--line-2); border-radius: var(--r-pill); padding: 6px 12px; backdrop-filter: blur(6px);
}
.prism-step {
  width: 30px; height: 30px; display: grid; place-items: center; border-radius: 50%;
  border: 1px solid var(--line-2); background: color-mix(in oklab, var(--ink-950, #05070c) 55%, transparent);
  color: var(--text-hi); font-size: 16px; line-height: 1; cursor: pointer; backdrop-filter: blur(6px);
  transition: border-color .2s ease, color .2s ease;
}
.prism-step:hover { border-color: var(--cyan); color: var(--text-accent); }

.prism-controls { display: flex; flex-direction: column; gap: var(--space-s); }
.prism-control label { display: flex; justify-content: space-between; font-size: 12px; color: var(--text-mid); margin-bottom: 6px; }
.prism-control label .mono { color: var(--text-accent); }

input[type="range"] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 4px;
  border-radius: var(--r-pill); background: var(--line-2); outline: none; margin: 0;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%; background: var(--cyan);
  border: 2px solid var(--surface); box-shadow: 0 0 0 1px color-mix(in oklab, var(--cyan) 55%, transparent);
  cursor: pointer;
}
input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%; background: var(--cyan); border: 2px solid var(--surface); cursor: pointer;
}
input[type="range"]::-moz-range-track { height: 4px; border-radius: var(--r-pill); background: var(--line-2); }

.btn--sm { padding: 9px 16px; font-size: 13px; }

.prism-caution { margin-top: var(--space-s); font-size: 11.5px; line-height: 1.5; color: var(--text-lo); max-width: 46ch; }

#prism-canvas { min-height: 220px; }
@media (max-width: 720px) { #prism-canvas { min-height: 180px; } }

/* ---- Rhythm Prism: audio entrainment controls ---- */
.prism-audio {
  margin-top: var(--space-m); padding-top: var(--space-m);
  border-top: 1px solid var(--line-2);
  display: flex; flex-direction: column; gap: var(--space-s);
}
.prism-audio__label {
  font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: var(--text-lo);
}
.prism-audio-modes { display: flex; gap: 8px; }
.prism-audio-mode {
  flex: 1; padding: 8px 10px; font-size: 12px; font-family: var(--font-mono);
  border: 1px solid var(--line-2); border-radius: var(--r-s); background: transparent;
  color: var(--text-mid); cursor: pointer; transition: border-color .2s ease, color .2s ease, background .2s ease;
}
.prism-audio-mode:hover { border-color: var(--cyan); color: var(--text-hi); }
.prism-audio-mode[aria-selected="true"] {
  border-color: color-mix(in oklab, var(--cyan) 55%, transparent);
  background: color-mix(in oklab, var(--cyan) 10%, transparent);
  color: var(--text-hi);
}
.prism-audio__note { font-size: 11px; line-height: 1.5; color: var(--text-lo); margin: 0; }
#prism-audio-play.is-active { --btn-bg: var(--cyan); --btn-fg: var(--ink-950, #05070c); font-weight: 700; }

/* ============================================================================
   v3.5 — AUDIO-REACTIVE SHOWCASE + POLISH LAYER
   Appended. Everything here is additive; nothing above is overridden except
   where a selector is intentionally strengthened (documented inline).
   ============================================================================ */

/* ---- Live spectrum meter: the visible wire between sound and shader -------- */
.prism-eq {
  position: absolute; left: 0; right: 0; bottom: 0; height: 34%;
  width: 100%; pointer-events: none; opacity: .0;
  transition: opacity .5s var(--ease-out);
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 70%);
          mask-image: linear-gradient(180deg, transparent, #000 70%);
}
.prism-canvas-wrap.is-audio-live .prism-eq { opacity: .9; }

.prism-canvas-wrap {
  transition: box-shadow .5s var(--ease-out), border-color .5s var(--ease-out);
}
.prism-canvas-wrap.is-audio-live {
  border-color: color-mix(in oklab, var(--cyan) 55%, transparent);
  box-shadow:
    0 0 0 1px color-mix(in oklab, var(--cyan) 40%, transparent),
    0 24px 70px -30px color-mix(in oklab, var(--cyan) 70%, transparent),
    inset 0 0 60px -20px color-mix(in oklab, var(--cyan) 45%, transparent);
}

.prism-badge { display: inline-flex; align-items: center; gap: 7px; }
.prism-badge__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: color-mix(in oklab, var(--cyan) 40%, var(--text-lo));
  transition: background-color .4s var(--ease-out);
}
.prism-canvas-wrap.is-audio-live .prism-badge__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 0 var(--glow-cyan);
  animation: pulse 1.6s var(--ease-inout) infinite;
}

/* ---- Ambient-bed toggle --------------------------------------------------- */
.prism-bed {
  margin-top: 2px; padding: 8px 12px; width: 100%;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--text-mid); background: transparent;
  border: 1px solid var(--line-2); border-radius: var(--r-s);
  transition: border-color .2s var(--ease-out), color .2s var(--ease-out), background-color .2s var(--ease-out);
}
.prism-bed:hover { border-color: var(--cyan); color: var(--text-hi); }
.prism-bed[aria-pressed="true"] {
  color: var(--text-accent);
  border-color: color-mix(in oklab, var(--cyan) 45%, transparent);
  background: color-mix(in oklab, var(--cyan) 8%, transparent);
}

/* ---- Modern range fill (progressive; accent-color where supported) -------- */
@supports (accent-color: red) {
  input[type="range"] { accent-color: var(--cyan); }
}

/* ---- Scroll progress rail ------------------------------------------------- */
#scroll-progress {
  position: fixed; top: 0; left: 0; height: 2px; width: 0%;
  z-index: 1000; pointer-events: none;
  background: linear-gradient(90deg, var(--cyan), color-mix(in oklab, var(--cyan) 40%, var(--amber)));
  box-shadow: 0 0 12px color-mix(in oklab, var(--cyan) 70%, transparent);
  transition: width .1s linear;
}

/* ---- Nav elevates once you leave the hero --------------------------------- */
.nav.is-scrolled {
  background: color-mix(in oklab, var(--nav-bg) 90%, var(--bg));
  border-bottom-color: var(--line);
  box-shadow: 0 10px 34px -22px rgba(2, 8, 20, .8);
}

/* ---- Film grain: a whisper of texture over the whole page ----------------- */
body::after {
  content: ""; position: fixed; inset: 0; z-index: 1500; pointer-events: none;
  opacity: .035; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%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");
}
:root[data-theme="light"] body::after { opacity: .02; mix-blend-mode: multiply; }
@media (prefers-reduced-motion: reduce) { body::after { display: none; } }

/* ---- Hero: a cooler ambient top-glow behind the field --------------------- */
.hero__stage::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(60% 42% at 50% -6%, color-mix(in oklab, var(--cyan) 16%, transparent), transparent 70%);
}

/* live-trace panel breathes with a soft accent ring once audio is active */
.eeg-panel { transition: box-shadow .5s var(--ease-out), border-color .5s var(--ease-out); }
body.audio-live .eeg-panel {
  border-color: color-mix(in oklab, var(--cyan) 45%, var(--line));
  box-shadow: 0 20px 50px -30px color-mix(in oklab, var(--cyan) 60%, transparent);
}

/* ---- Prism play button: unmistakable active state ------------------------- */
#prism-audio-play { transition: transform var(--dur-2) var(--ease-spring), box-shadow var(--dur-2) var(--ease-out), background-color var(--dur-2); }
#prism-audio-play.is-active {
  --btn-bg: var(--cyan); --btn-fg: var(--ink-950, #05070c); font-weight: 700;
  box-shadow: 0 10px 30px -12px color-mix(in oklab, var(--cyan) 80%, transparent);
}

/* Respect users who never want the motion: freeze reactive shells gracefully */
@media (prefers-reduced-motion: reduce) {
  .prism-canvas-wrap.is-audio-live .prism-badge__dot { animation: none; }
}

/* ============================================================================
   SESSION PREVIEW (v1) — replaces Rhythm Prism. Dark-luxury, restrained.
   ============================================================================ */
.preview {
  display: grid; gap: var(--space-l); grid-template-columns: 1fr; align-items: start;
}
@container (min-width: 900px) { .preview { grid-template-columns: 1fr 320px; } }

/* --- stage --- */
.preview__stage {
  position: relative; border: 1px solid var(--line-2); border-radius: var(--r-l);
  overflow: hidden; aspect-ratio: 16 / 10; min-height: 260px;
  background: color-mix(in oklab, var(--surface) 60%, transparent);
  transition: box-shadow .6s var(--ease-out), border-color .6s var(--ease-out);
}
.preview__stage canvas#preview-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.preview__stage.is-live {
  border-color: color-mix(in oklab, var(--cyan) 34%, transparent);
  box-shadow: 0 0 0 1px color-mix(in oklab, var(--cyan) 22%, transparent),
              0 30px 80px -46px color-mix(in oklab, var(--cyan) 60%, transparent);
}

.preview__status {
  position: absolute; top: 14px; left: 14px; z-index: 3;
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 10px; letter-spacing: .12em; color: var(--text-mid);
  background: color-mix(in oklab, var(--ink-950, #05070c) 55%, transparent);
  border: 1px solid var(--line-2); border-radius: var(--r-pill);
  padding: 5px 11px; backdrop-filter: blur(6px);
}
.preview__dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: color-mix(in oklab, var(--text-lo) 70%, transparent);
  transition: background-color .5s var(--ease-out);
}
.preview__stage.is-live .preview__dot {
  background: var(--cyan); box-shadow: 0 0 0 0 var(--glow-cyan);
  animation: pulse 2s var(--ease-inout) infinite;
}
.preview__stage.is-live .preview__status { color: var(--text-hi); }

/* --- live waveform strip (honest proof) --- */
.preview__scope {
  position: absolute; left: 14px; right: 14px; bottom: 14px; z-index: 3;
  display: flex; flex-direction: column; gap: 4px;
}
.preview__scope-label {
  font-size: 9px; letter-spacing: .16em; color: var(--text-lo);
  text-transform: uppercase;
}
#preview-scope { width: 100%; height: 40px; display: block; opacity: .95; }

/* --- begin overlay (standby) --- */
.preview__begin {
  position: absolute; inset: 0; z-index: 4; display: grid; place-items: center;
  color: var(--text-hi); background: transparent; cursor: pointer;
}
.preview__begin-ring {
  position: absolute; width: 92px; height: 92px; border-radius: 50%;
  border: 1px solid color-mix(in oklab, var(--cyan) 45%, transparent);
  box-shadow: 0 0 40px -8px color-mix(in oklab, var(--cyan) 45%, transparent);
  transition: transform var(--dur-2) var(--ease-spring), border-color var(--dur-2);
}
.preview__begin::after {
  content: ""; position: absolute; width: 0; height: 0;
  border-left: 15px solid var(--text-hi); border-top: 10px solid transparent; border-bottom: 10px solid transparent;
  transform: translateX(3px); opacity: .92; transition: border-color var(--dur-2);
}
.preview__begin-label {
  position: absolute; bottom: calc(50% - 78px);
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--text-mid);
}
.preview__begin:hover .preview__begin-ring { transform: scale(1.08); border-color: var(--cyan); }
.preview__begin:focus-visible { outline: none; }
.preview__begin:focus-visible .preview__begin-ring { border-color: var(--cyan); box-shadow: 0 0 0 3px color-mix(in oklab, var(--cyan) 40%, transparent); }

/* --- control panel --- */
.preview__panel { display: flex; flex-direction: column; gap: var(--space-m); }

.preview__goals { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.preview__goal {
  display: flex; flex-direction: column; gap: 3px; align-items: flex-start;
  padding: 12px 12px; border: 1px solid var(--line-2); border-radius: var(--r-m);
  background: transparent; color: var(--text-mid); text-align: left; cursor: pointer;
  transition: border-color .2s var(--ease-out), background-color .2s var(--ease-out), color .2s var(--ease-out), transform .2s var(--ease-out);
}
.preview__goal:hover { border-color: var(--line); transform: translateY(-1px); }
.preview__goal-name { font-weight: 600; font-size: 15px; color: var(--text-hi); }
.preview__goal-desc { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--text-lo); }
.preview__goal.is-selected {
  border-color: color-mix(in oklab, var(--cyan) 55%, transparent);
  background: color-mix(in oklab, var(--cyan) 9%, transparent);
}
.preview__goal.is-selected .preview__goal-desc { color: var(--text-accent); }

.preview__slider label { display: flex; justify-content: space-between; font-size: 13px; color: var(--text-mid); margin-bottom: 8px; }
.preview__slider label .mono { color: var(--text-accent); }
.preview__hint { font-size: 11.5px; color: var(--text-lo); margin-top: 6px; }

.preview__safety {
  font-size: 11.5px; line-height: 1.55; color: var(--text-lo);
  border-top: 1px solid var(--line-2); padding-top: var(--space-s);
}

/* --- CTA handoff --- */
.preview__cta {
  margin-top: var(--space-xl); display: flex; flex-wrap: wrap; align-items: center;
  justify-content: space-between; gap: var(--space-m);
  border-top: 1px solid var(--line-2); padding-top: var(--space-l);
}
.preview__cta-line { font-family: var(--font-serif); font-size: var(--step-1); color: var(--text-mid); max-width: 46ch; }
.preview__cta-line #preview-cta-goal { color: var(--text-accent); font-style: italic; }

/* --- warning modal actions --- */
.modal--warning .modal__actions { display: flex; flex-direction: column; gap: 10px; margin-top: var(--space-m); }
.modal--warning .modal__actions .btn { width: 100%; }

/* --- reduced motion: preview stays static, audio still available --- */
@media (prefers-reduced-motion: reduce) {
  .preview__stage.is-live .preview__dot { animation: none; }
  .preview__begin-ring { transition: none; }
}

@media (max-width: 620px) {
  .preview__stage { aspect-ratio: 4 / 3; min-height: 220px; }
  .preview__goals { grid-template-columns: repeat(3, 1fr); }
  .preview__goal { padding: 10px 8px; }
  .preview__goal-name { font-size: 14px; }
}

/* Ensure modal dialogs center reliably when opened with showModal() */
dialog.modal { position: fixed; inset: 0; margin: auto; }