/* Modern pass (owner, 2026-10-27: "website should look modern thats the goal", with three
   references: an AI coding-agent landing page, a retro console landing page, and a 3D "Portals"
   page). Loaded after lit.css on every page; removing this file (and the Geist fonts in
   tools/templates/v3/shell.mjs, the radii and palettes in tokens.css) restores the earlier look.
   What it changes, everywhere and in every theme:
     type    Geist at modern weights with tight tracking on headings (tokens.css sets the family)
     shape   pill buttons, a capsule nav, large-radius cards, softer hairlines
     light   one broad glow behind the hero instead of corner glows; faint stars on dark themes
     depth   cards tilt toward the pointer with a moving glare (assets/v3/depth.mjs). The wheel's
             3D tilt was tried and removed on the owner's call (2026-10-27): the wheel is static. */

:root { --lit-r: 20px; }
body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-rendering: optimizeLegibility; font-optical-sizing: auto; }

/* ---- type ---- */
h1, h2 { font-weight: 640; letter-spacing: -.035em; word-spacing: normal; }
h3 { letter-spacing: -.02em; }
.eyebrow, .note-label, .spec-block dt, thead th, .lesson-nav .dir, .filters label, .theme-menu-title { letter-spacing: .01em; }

/* ---- shape: pills and capsules ---- */
.btn { border-radius: var(--r-pill); padding: 0 24px; font-weight: 560; letter-spacing: -.005em; }
.btn-ghost { border-color: color-mix(in srgb, var(--ink) 18%, transparent); background: color-mix(in srgb, var(--ink) 4%, transparent); }
.btn-ghost:hover { background: color-mix(in srgb, var(--ink) 9%, transparent); }
.site-nav { padding: 4px; gap: 2px; border: 1px solid color-mix(in srgb, var(--ink) 12%, transparent); border-radius: var(--r-pill); background: color-mix(in srgb, var(--paper) 55%, transparent); }
.site-nav a { border-radius: var(--r-pill); }
.theme-button { border-radius: var(--r-pill); }
.lit { border-color: color-mix(in srgb, var(--ink) 10%, transparent); }
.site-footer .title-block { border-color: color-mix(in srgb, var(--ink) 10%, transparent); }

/* ---- the header (owner, 2026-10-27: "header looks very small and weak", tabs "very simple and
   tiny", "theme dropdown is large"): a taller bar, a bigger mark and name, a centred capsule of
   tabs with icons and a lit active pill, and a compact round theme button with a short menu. ---- */
.site-header { min-height: 76px; padding: 14px var(--gutter); gap: 28px; }
.brand { gap: 12px; }
.brand-mark { width: 44px; height: 44px; margin: -6px 0; }
.brand-name { font-size: 22px; font-weight: 680; letter-spacing: -.03em; }
.site-nav { margin: 0 auto; padding: 5px; gap: 4px; background: color-mix(in srgb, var(--card) 72%, transparent);
  box-shadow: 0 1px 0 color-mix(in srgb, #fff 6%, transparent) inset, 0 10px 30px -18px rgb(0 0 0 / .5); }
.site-nav a { display: inline-flex; align-items: center; gap: 9px; padding: 11px 20px; font: 580 15.5px/1 var(--sans); letter-spacing: -.01em; color: var(--ink-2);
  transition: background .2s var(--ease), color .2s var(--ease), box-shadow .2s var(--ease); }
.nav-icon { flex: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; color: var(--muted); transition: color .2s var(--ease), transform .25s var(--ease); }
.site-nav a:hover { background: color-mix(in srgb, var(--ink) 8%, transparent); color: var(--ink); }
.site-nav a:hover .nav-icon { color: var(--accent); transform: translateY(-1px); }
.site-nav a[aria-current="page"] { border-radius: var(--r-pill); color: var(--ink); background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 22%, var(--card)), color-mix(in srgb, var(--accent) 12%, var(--card)));
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 45%, transparent), inset 0 1px 0 rgb(255 255 255 / .12), 0 8px 22px -10px color-mix(in srgb, var(--accent) 70%, transparent); }
.site-nav a[aria-current="page"] .nav-icon { color: var(--accent); }

/* the theme button: a round swatch of the current theme */
.theme-picker { flex: none; }
.theme-button { width: 44px; height: 44px; min-height: 0; padding: 0; justify-content: center; border-radius: 50%; border: 1px solid color-mix(in srgb, var(--ink) 16%, transparent); }
.theme-button:hover { border-color: color-mix(in srgb, var(--ink) 34%, transparent); }
.theme-chip, .theme-dot { display: block; width: 24px; height: 24px; border: 0; border-radius: 50%;
  background: conic-gradient(from -45deg, var(--paper) 0 33%, var(--accent) 0 66%, var(--wave-signal) 0);
  box-shadow: inset 0 0 0 1.5px color-mix(in srgb, var(--ink) 30%, transparent), inset 0 2px 3px rgb(255 255 255 / .25); }
/* the menu: one short row per theme */
.theme-menu { width: 230px; padding: 6px; gap: 2px; border-radius: 16px; border: 1px solid color-mix(in srgb, var(--ink) 14%, transparent); background: var(--card);
  box-shadow: 0 24px 48px -16px rgb(0 0 0 / .55), 0 2px 6px rgb(0 0 0 / .2); }
.theme-menu-title { margin: 6px 10px 4px; font: 600 12px/1.3 var(--sans); letter-spacing: .02em; color: var(--muted); }
.theme-option { grid-template-columns: 22px minmax(0, 1fr) 16px; gap: 12px; padding: 9px 10px; border: 0; border-radius: 10px; background: transparent; }
.theme-option:hover { background: color-mix(in srgb, var(--ink) 8%, transparent); border: 0; }
.theme-option[aria-pressed="true"] { background: color-mix(in srgb, var(--accent) 14%, transparent); box-shadow: none; }
.theme-option .theme-dot { width: 22px; height: 22px; }
.theme-option-name { font: 560 14.5px/1.2 var(--sans); }
.theme-check { stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; opacity: 0; }
.theme-option[aria-pressed="true"] .theme-check { opacity: 1; }

/* the account slot in the header (assets/v3/site.mjs): Sign in, or rating and initial */
.account-slot { flex: none; display: flex; align-items: center; }
.account-slot[hidden] { display: none; }
.account-signin { display: inline-flex; align-items: center; min-height: 40px; padding: 0 18px; border-radius: var(--r-pill); font: 600 14.5px var(--sans); text-decoration: none;
  color: var(--on-accent); background: var(--accent); box-shadow: 0 6px 18px -8px color-mix(in srgb, var(--accent) 70%, transparent); }
.account-signin:hover { filter: brightness(1.06); }
.account-chip { display: inline-flex; align-items: center; gap: 8px; padding: 4px 4px 4px 14px; border-radius: var(--r-pill); text-decoration: none; color: var(--ink);
  border: 1px solid color-mix(in srgb, var(--ink) 16%, transparent); background: color-mix(in srgb, var(--card) 70%, transparent); }
.account-chip:hover { border-color: color-mix(in srgb, var(--accent) 55%, transparent); }
.account-rating { font: 700 14.5px var(--mono); }
.account-avatar { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; font: 700 15px var(--sans); color: var(--on-accent); background: var(--accent); }
/* extra themes show a padlock while signed out */
.theme-lock { display: none; stroke: var(--muted); stroke-width: 1.5; }
.theme-picker.signed-out .theme-lock { display: block; }
.theme-picker.signed-out .theme-option:has(.theme-lock) .theme-option-name { color: var(--muted); }
.theme-option { grid-template-columns: 22px minmax(0, 1fr) 16px auto; }
.theme-locked-note { margin: 6px 8px 4px; font: 500 13px/1.4 var(--sans); color: var(--ink-2); }
.theme-locked-note a { color: var(--link); font-weight: 650; }

/* ---- softer frames: the lesson's info strip and table headers use hairlines, not 2px ink ---- */
.spec-block { border: 1px solid color-mix(in srgb, var(--ink) 16%, transparent); border-radius: 14px; overflow: hidden; background: color-mix(in srgb, var(--card) 60%, transparent); }
.spec-block > div { border-right-color: color-mix(in srgb, var(--ink) 12%, transparent); }
thead th { border-bottom: 1px solid color-mix(in srgb, var(--ink) 22%, transparent); }
[data-theme="contrast"] .spec-block { border: var(--bw-strong) solid var(--ink); }
[data-theme="contrast"] thead th { border-bottom: var(--bw-strong) solid var(--ink); }

/* ---- light: one broad glow from the top centre, like a stage light behind the hero ---- */
body {
  background-image:
    radial-gradient(1100px 620px at 50% -12%, var(--glow-b), transparent 66%),
    radial-gradient(800px 560px at 8% 0%, var(--glow-a), transparent 62%),
    radial-gradient(1000px 700px at 96% 108%, var(--glow-c), transparent 64%);
}
/* faint stars on the dark themes (not high contrast) */
[data-scheme="dark"]:not([data-theme="contrast"]):not([data-theme="noir"]):not([data-theme="fallout"]):not([data-theme="remix"]):not([data-theme="halloween"]) body::after {
  content: ''; position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: .55;
  background-image:
    radial-gradient(1.2px 1.2px at 12% 18%, rgb(255 255 255 / .55), transparent 60%),
    radial-gradient(1px 1px at 72% 12%, rgb(255 255 255 / .45), transparent 60%),
    radial-gradient(1.4px 1.4px at 38% 62%, rgb(255 255 255 / .35), transparent 60%),
    radial-gradient(1px 1px at 88% 48%, rgb(255 255 255 / .45), transparent 60%),
    radial-gradient(1.2px 1.2px at 58% 84%, rgb(255 255 255 / .3), transparent 60%),
    radial-gradient(1px 1px at 22% 76%, rgb(255 255 255 / .35), transparent 60%);
  background-size: 520px 520px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 70%); mask-image: linear-gradient(180deg, #000 0%, transparent 70%);
}

/* ---- depth: cards tilt toward the pointer, with a glare that follows it (assets/v3/depth.mjs) ---- */
[data-tilt] { position: relative; transform: perspective(900px) rotateX(var(--trx, 0deg)) rotateY(var(--try, 0deg)) translateY(var(--tly, 0px)); transition: transform .5s var(--ease), box-shadow .25s var(--ease), border-color .25s; transform-style: preserve-3d; }
[data-tilt].tilting { transition: transform .08s linear, box-shadow .25s var(--ease), border-color .25s; --tly: -4px; }
[data-tilt]::after { content: ''; position: absolute; inset: 0; border-radius: inherit; pointer-events: none; opacity: 0; transition: opacity .3s;
  background: radial-gradient(420px circle at var(--gx, 50%) var(--gy, 0%), rgb(255 255 255 / .14), transparent 45%); }
[data-tilt].tilting::after { opacity: 1; }
[data-scheme="light"] [data-tilt]::after { background: radial-gradient(420px circle at var(--gx, 50%) var(--gy, 0%), rgb(255 255 255 / .7), transparent 45%); }
.lift[data-tilt]:hover, .lift[data-tilt]:focus-visible { transform: perspective(900px) rotateX(var(--trx, 0deg)) rotateY(var(--try, 0deg)) translateY(-4px); }
[data-tilt] .emblem { transform: translateZ(28px); }

@media (prefers-reduced-motion: reduce) {
  [data-tilt], [data-tilt].tilting, .lift[data-tilt]:hover { transform: none; transition: none; }
}
@media (max-width: 900px) {
  .site-header { min-height: 0; padding: 12px var(--gutter) 0; gap: 12px; }
  .site-nav { order: 3; width: 100%; margin: 0 0 12px; padding: 4px; border-top: 1px solid color-mix(in srgb, var(--ink) 12%, transparent); overflow-x: auto; }
  .site-nav a { flex: 1; justify-content: center; padding: 10px 12px; }
  .theme-picker { margin-left: auto; }
}
@media (max-width: 520px) {
  .account-signin { min-height: 36px; padding: 0 12px; font-size: 13.5px; }
  .account-rating { display: none; }
  .account-chip { padding: 3px; }
  .brand-mark { width: 38px; height: 38px; }
  .brand-name { font-size: 20px; }
  .site-nav a { gap: 6px; padding: 9px 8px; font-size: 14.5px; }
  .theme-button { width: 40px; height: 40px; }
}