/* Unit page template — shared navy design system for every converted unit page.
   Light + dark themes; dark follows the device unless the toggle sets data-theme.
   Includes the hero-game kit (.fg-*: HUD, stage, overlays, controls), the graph dialog (.fr-*),
   section styles and the Reading reader. Unit-specific styles live in units/<slug>/. */

:root {
  --navy-950: #050a18;
  --navy-900: #0a1430;
  --navy-850: #0e1a3d;
  --navy-800: #13224d;
  --navy-700: #1b2f66;
  --navy-600: #24418a;
  --volt: #3b82ff;
  --volt-soft: #8db6ff;
  --amber: #ffb22e;

  --bg: #f3f5fa;
  --surface: #ffffff;
  --surface-2: #f6f8fc;
  --ink: #0a1430;
  --ink-2: #3a4668;
  --ink-3: #6b7594;
  --line: rgba(10, 20, 48, 0.10);
  --line-2: rgba(10, 20, 48, 0.18);
  --grid: rgba(27, 47, 102, 0.06);
  --accent: #1f5fe0;
  --accent-ink: #ffffff;
  --shadow: 0 1px 0 rgba(10,20,48,.04), 0 18px 48px -18px rgba(10,20,48,.28);

  --bot-shell: #13224d;
  --bot-shell-hi: #2f50a8;
  --bot-edge: #0a1430;
  --bot-limb: #0a1430;
  --bot-limb-far: #4a5a85;
  --bot-eye: #3b82ff;

  --font-display: 'Clash Display', system-ui, sans-serif;
  --font-body: 'Satoshi', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --r: 18px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: var(--navy-950); --surface: var(--navy-900); --surface-2: var(--navy-850);
    --ink: #e9eefc; --ink-2: #aab6d6; --ink-3: #7584ad;
    --line: rgba(141,182,255,.12); --line-2: rgba(141,182,255,.22); --grid: rgba(141,182,255,.05);
    --accent: var(--volt); --accent-ink: #050a18;
    --shadow: 0 0 0 1px rgba(141,182,255,.08), 0 24px 60px -24px rgba(0,0,0,.7);
    --bot-shell: #1b2f66; --bot-shell-hi: #4f78d8; --bot-edge: #8db6ff; --bot-limb: #c9d7ff; --bot-limb-far: #4a5f99; --bot-eye: #6aa3ff;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: var(--navy-950); --surface: var(--navy-900); --surface-2: var(--navy-850);
  --ink: #e9eefc; --ink-2: #aab6d6; --ink-3: #7584ad;
  --line: rgba(141,182,255,.12); --line-2: rgba(141,182,255,.22); --grid: rgba(141,182,255,.05);
  --accent: var(--volt); --accent-ink: #050a18;
  --shadow: 0 0 0 1px rgba(141,182,255,.08), 0 24px 60px -24px rgba(0,0,0,.7);
  --bot-shell: #1b2f66; --bot-shell-hi: #4f78d8; --bot-edge: #8db6ff; --bot-limb: #c9d7ff; --bot-limb-far: #4a5f99; --bot-eye: #6aa3ff;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0; overflow-x: clip;
  background:
    linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 32px 32px,
    linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 32px 32px,
    var(--bg);
  color: var(--ink);
  font: 17px/1.55 var(--font-body);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
button { font: inherit; color: inherit; }
img { max-width: 100%; display: block; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 8px; }
.wrap { width: min(1200px, 100% - 32px); margin-inline: auto; }
kbd { font: 600 .85em var(--font-mono); padding: 2px 6px; border-radius: 6px; border: 1px solid rgba(141,182,255,.35); }

.kicker {
  display: inline-flex; align-items: center; gap: 10px; margin: 0 0 16px;
  font: 600 12px/1 var(--font-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3);
}
.kicker .dot { width: 8px; height: 8px; border-radius: 2px; background: var(--accent); box-shadow: 0 0 12px var(--accent); }
.kicker b { color: var(--accent); font-weight: 700; }

/* ---------- buttons ---------- */
.btn-solid {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 11px 18px; border: 0; border-radius: 999px;
  background: var(--accent); color: var(--accent-ink); font-weight: 700; font-size: 15px; text-decoration: none; cursor: pointer;
  transition: transform .15s, box-shadow .15s;
}
.btn-solid:hover { transform: translateY(-1px); box-shadow: 0 8px 22px -8px var(--accent); }
.btn-ghost {
  display: inline-flex; align-items: center; justify-content: center; padding: 10px 16px; border-radius: 999px; border: 1px solid var(--line-2);
  background: transparent; font-weight: 600; font-size: 15px; cursor: pointer; text-decoration: none;
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 12px max(16px, calc((100% - 1200px) / 2));
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px) saturate(1.4); -webkit-backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 600 20px/1 var(--font-display); letter-spacing: -.01em; }
.brand-bot { width: 52px; height: 39px; --walk: running; --leg-dur: 1.6s; --flap: running; --flap-dur: 2.4s; }
.nav-end { display: flex; align-items: center; gap: 10px; }
.theme-btn { width: 40px; height: 40px; border-radius: 50%; border: 1px solid var(--line-2); background: var(--surface); cursor: pointer; font-size: 16px; }
.theme-btn .moon { display: none; }
:root[data-theme="dark"] .theme-btn .sun { display: none; }
:root[data-theme="dark"] .theme-btn .moon { display: inline; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-btn .sun { display: none; }
  :root:not([data-theme="light"]) .theme-btn .moon { display: inline; }
}

/* ---------- hero ---------- */
.hero { padding: 48px 0 80px; position: relative; overflow: clip; }
.hero::before {
  content: ""; position: absolute; inset: -20% -10% auto auto; width: 70vw; height: 70vw; max-width: 900px; max-height: 900px;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--accent) 22%, transparent), transparent);
  pointer-events: none;
}
.hero-grid { position: relative; display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1.1fr); gap: 56px; align-items: start; }
.hero-copy { padding-top: 28px; }
@media (max-width: 1000px) { .hero-grid { grid-template-columns: minmax(0,1fr); gap: 40px; } .hero-copy { padding-top: 0; } }
h1 { margin: 0 0 22px; font: 700 clamp(56px, 8vw, 104px)/.92 var(--font-display); letter-spacing: -.035em; }
h1 em { font-style: normal; color: var(--accent); }
.big-idea { margin: 0 0 30px; max-width: 34ch; font-size: 20px; line-height: 1.5; color: var(--ink-2); }
.big-idea strong { color: var(--ink); font-weight: 700; }

.passport {
  display: flex; align-items: center; gap: 16px; width: 100%; max-width: 460px; padding: 14px 18px 14px 14px;
  background: var(--surface); border: 1px solid var(--line-2); border-radius: var(--r); box-shadow: var(--shadow);
  text-align: left; cursor: pointer; transition: border-color .2s, transform .2s;
}
.passport:hover { border-color: var(--accent); transform: translateY(-2px); }
.passport-stamp { flex: none; width: 52px; height: 52px; display: grid; place-items: center; border-radius: 14px; background: linear-gradient(145deg, var(--navy-700), var(--navy-900)); }
.passport-stamp svg { width: 32px; height: 32px; fill: none; stroke: var(--volt-soft); stroke-width: 2.4; stroke-linejoin: round; stroke-linecap: round; }
.passport-text { display: grid; gap: 4px; flex: 1; }
.passport-label { font: 600 19px/1.1 var(--font-display); }
.passport-code { font: 500 12px/1.3 var(--font-mono); color: var(--ink-3); letter-spacing: .02em; }
.passport-arrow { font-size: 20px; color: var(--accent); transition: transform .2s; }
.passport:hover .passport-arrow { transform: translateX(4px); }

.route { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin: 28px 0 0; padding: 0; list-style: none; max-width: 460px; }
.route a {
  display: grid; gap: 6px; padding: 12px 10px 11px; border-radius: 14px; border: 1px solid var(--line); text-decoration: none;
  font-weight: 600; font-size: 14px; background: color-mix(in srgb, var(--surface) 55%, transparent); transition: border-color .2s, background .2s;
}
.route a b { font: 700 11px/1 var(--font-mono); color: var(--accent); }
.route a:hover { border-color: var(--accent); background: var(--surface); }
@media (max-width: 520px) { .route { grid-template-columns: repeat(3, 1fr); } }

/* ---------- dark card shell + hero-game kit (shared by every hero game) ---------- */
.toy-card {
  position: relative; padding: 18px; border-radius: 26px;
  background: linear-gradient(160deg, var(--navy-850), var(--navy-950));
  color: #e9eefc; box-shadow: 0 40px 80px -40px rgba(5,10,24,.8), inset 0 0 0 1px rgba(141,182,255,.14);
  --line: rgba(141,182,255,.14); --line-2: rgba(141,182,255,.26); --ink-3: #7f8db5; --accent: var(--volt); --accent-ink: #050a18;
  --bot-shell: #1b2f66; --bot-shell-hi: #4f78d8; --bot-edge: #8db6ff; --bot-limb: #c9d7ff; --bot-limb-far: #4a5f99; --bot-eye: #6aa3ff;
}
.mg-eyebrow, .fg-eyebrow { margin: 0 0 4px; font: 700 11px/1 var(--font-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--amber); }
.fg-top { display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; padding: 4px 6px 12px; }
.fg-top h2 { margin: 0; font: 600 26px/1.1 var(--font-display); letter-spacing: -.01em; }
.fg-best { margin: 0; font: 500 13px var(--font-mono); color: #9aa8cf; }
.fg-best b { color: var(--amber); }
.fg-hud { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 12px; }
.fg-hud div { padding: 10px 12px; border-radius: 12px; background: rgba(141,182,255,.06); border: 1px solid var(--line); }
.fg-hud span { display: block; font: 600 10px/1 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: #7f8db5; margin-bottom: 6px; }
.fg-hud b { font: 700 17px/1 var(--font-mono); color: #e9eefc; white-space: nowrap; }
.fg-arrow { font-style: normal; display: inline-block; width: 1em; }
.fg-arrow.up { color: #6ee7a8; } .fg-arrow.down { color: var(--amber); }
@media (max-width: 560px) { .fg-hud { grid-template-columns: repeat(2, 1fr); } }
.fg-stage {
  position: relative; aspect-ratio: 560 / 340; border-radius: 16px; overflow: hidden; cursor: pointer;
  background: radial-gradient(120% 90% at 70% 0%, #13224d 0%, #070e22 70%); border: 1px solid var(--line);
  touch-action: manipulation; user-select: none; -webkit-user-select: none;
}
.fg-stage:focus-visible { outline-offset: -3px; }
.fg-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.fg-bot { position: absolute; left: 0; top: 0; aspect-ratio: 220 / 166; transform-origin: 50% 60%; pointer-events: none; filter: drop-shadow(0 6px 10px rgba(59,130,255,.35)); --leg-dur: .25s; }
.fg-overlay {
  position: absolute; inset: 0; display: grid; place-content: center; justify-items: center; gap: 10px; padding: 20px; text-align: center;
  background: rgba(5,10,24,.62); backdrop-filter: blur(3px);
}
.fg-overlay[hidden] { display: none; }
.fg-overlay p { margin: 0; color: #c9d7ff; max-width: 40ch; }
.fg-big { font: 700 38px/1 var(--font-display) !important; color: #fff !important; letter-spacing: -.02em; }
.fg-over { grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); place-content: center; align-items: center; gap: 18px; text-align: left; justify-items: stretch; }
.fg-over-text { display: grid; gap: 10px; justify-items: start; }
.fg-over-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.fg-over-actions .btn-ghost { color: #e9eefc; }
@media (max-width: 520px) { .fg-over { grid-template-columns: minmax(0, 1fr); } .fg-graph { display: none; } }
.fg-sum { font-size: 15px; line-height: 1.5; }
.fg-sum b { color: var(--volt-soft); }
.fg-graph { width: 100%; height: auto; padding: 8px; border-radius: 12px; background: rgba(5,10,24,.6); border: 1px solid var(--line); }
.fg-note { font-size: 13px; color: #9aa8cf !important; }
.fg-avg { stroke: var(--amber); stroke-width: 1.5; stroke-dasharray: 5 4; }
.fg-avg-label { fill: var(--amber); }
.fg-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; margin: 14px 6px 0; }
.fg-btn { min-width: 132px; }
.fg-help { font-size: 14px; color: #9aa8cf; }
.fg-relative { margin: 14px 6px 4px; font-size: 14px; color: #9aa8cf; }
.fg-relative b { color: var(--volt-soft); }

/* svg primitives */
.axis { stroke: rgba(201,215,255,.5); stroke-width: 1.5; }
.tick-label { fill: #7f8db5; font: 500 11px var(--font-mono); }
.axis-label { fill: #aab6d6; font: 600 10px var(--font-mono); letter-spacing: .08em; text-transform: uppercase; }
.trace-dot { fill: #fff; stroke: var(--volt); stroke-width: 3; }
.trace { fill: none; stroke: var(--volt); stroke-width: 3; stroke-linejoin: round; stroke-linecap: round; filter: drop-shadow(0 0 5px rgba(59,130,255,.7)); }

/* ---------- robot beetle Mk3 ---------- */
#bot-shell-g .s-hi { stop-color: var(--bot-shell-hi); }
#bot-shell-g .s-lo { stop-color: var(--bot-shell); }
.bot-shell { fill: url(#bot-shell-g); stroke: var(--bot-edge); stroke-width: 2; stroke-linejoin: round; }
.bot-plate, .bot-head { fill: var(--bot-shell); stroke: var(--bot-edge); stroke-width: 2; stroke-linejoin: round; }
.bot-bevel { fill: rgba(255,255,255,.16); }
.bot-seam { fill: none; stroke: var(--bot-edge); stroke-width: 1.6; opacity: .7; }
.bot-seam.thin { stroke-width: 1; opacity: .4; }
.bot-chevron { fill: none; stroke: var(--bot-eye); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.bot-rivet { fill: var(--bot-edge); opacity: .75; }
.bot-eye, .bot-tail { fill: var(--bot-eye); }
.bot-mandible { fill: var(--bot-limb); stroke: var(--bot-edge); stroke-width: 1; stroke-linejoin: round; }
.bot-belly { fill: var(--navy-950); stroke: var(--bot-edge); stroke-width: 1.5; stroke-linejoin: round; }
.bot-vent { stroke: var(--bot-eye); stroke-width: 2.5; stroke-linecap: round; stroke-dasharray: 9 6; }
.bot-limb { fill: none; stroke: var(--bot-limb); stroke-width: 5.5; stroke-linecap: round; stroke-linejoin: round; }
.bot-limb.far { stroke: var(--bot-limb-far); stroke-width: 4.5; }
.bot-piston { stroke: var(--bot-eye); stroke-width: 2; stroke-linecap: round; }
.bot-knee { fill: var(--bot-shell-hi); stroke: var(--bot-limb); stroke-width: 1.6; stroke-linejoin: round; }
.bot-knee.far { fill: var(--bot-limb-far); stroke: var(--bot-limb-far); }
.bot-foot { stroke: var(--bot-limb); stroke-width: 4; stroke-linecap: round; }
.bot-antenna { fill: none; stroke: var(--bot-limb); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.bot-node { fill: var(--bot-eye); filter: url(#bot-glow); }
.bot-wing { fill: color-mix(in srgb, var(--bot-eye) 22%, transparent); stroke: var(--bot-eye); stroke-width: 1.6; stroke-linejoin: round; }
.bot-wing.far { fill: color-mix(in srgb, var(--bot-eye) 12%, transparent); stroke-opacity: .55; }
.bot-vein { fill: none; stroke: var(--bot-eye); stroke-width: 1; opacity: .55; }
.wing { transform-box: view-box; transform-origin: var(--wx) var(--wy);
  animation: flap var(--flap-dur, .9s) ease-in-out infinite; animation-play-state: var(--flap, paused); }
.wing-far { animation-delay: -.04s; }
.flying { --flap: running; --flap-dur: .14s; }
@keyframes flap { 0%,100% { transform: rotate(0) scaleY(1); } 50% { transform: rotate(-32deg) scaleY(.6); } }
.bot-wing-edge { stroke: var(--bot-limb); stroke-width: 2.2; stroke-linecap: round; }
.leg { transform-box: view-box; transform-origin: var(--hx) var(--hy);
  animation: leg var(--leg-dur, .42s) ease-in-out infinite; animation-play-state: var(--walk, paused); }
.leg-b { animation-direction: reverse; }
.walking { --walk: running; }
@keyframes leg { 0%,100% { transform: rotate(-9deg); } 50% { transform: rotate(9deg); } }
@media (prefers-reduced-motion: reduce) { .leg, .wing { animation: none !important; } }

/* ---------- section bands ---------- */
.band { padding: 96px 0; border-top: 1px solid var(--line); }
.band-head { max-width: 720px; margin-bottom: 40px; }
.band-head-row { max-width: none; display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; flex-wrap: wrap; }
.band-head h2 { margin: 0 0 12px; font: 600 clamp(40px, 5.5vw, 64px)/1 var(--font-display); letter-spacing: -.03em; }
.band-lede { margin: 0; max-width: 56ch; font-size: 19px; color: var(--ink-2); }
.sub-head { margin: 56px 0 20px; font: 600 24px/1.1 var(--font-display); display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; }
.sub-head span { font: 500 12px var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }

.seg { display: inline-flex; padding: 4px; gap: 4px; border-radius: 12px; background: color-mix(in srgb, var(--accent) 8%, transparent); border: 1px solid var(--line); }
.seg button { border: 0; padding: 8px 14px; border-radius: 9px; background: transparent; cursor: pointer; font-size: 14px; font-weight: 600; color: var(--ink-2); }
.seg button[aria-checked="true"], .seg button[aria-selected="true"] { background: var(--accent); color: var(--accent-ink); }

/* ---------- videos ---------- */
.vid-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
@media (max-width: 1080px) { .vid-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .vid-grid { grid-template-columns: minmax(0, 1fr); } }
.vid { display: grid; gap: 14px; padding: 0; border: 0; background: none; text-align: left; cursor: pointer; }
.vid-thumb {
  position: relative; display: block; aspect-ratio: 16 / 10; border-radius: 18px; overflow: hidden;
  background: linear-gradient(150deg, var(--navy-700), var(--navy-950) 75%);
  box-shadow: inset 0 0 0 1px rgba(141,182,255,.16), var(--shadow);
  transition: transform .25s, box-shadow .25s;
}
.vid-thumb::before {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(rgba(141,182,255,.07) 1px, transparent 1px) 0 0 / 20px 20px, linear-gradient(90deg, rgba(141,182,255,.07) 1px, transparent 1px) 0 0 / 20px 20px;
}
.vid-thumb > svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.vid:hover .vid-thumb { transform: translateY(-4px); box-shadow: inset 0 0 0 1px rgba(141,182,255,.4), 0 26px 50px -24px rgba(59,130,255,.6); }
.vid-n { position: absolute; left: 14px; top: 10px; font: 700 34px/1 var(--font-display); color: rgba(233,238,252,.9); letter-spacing: -.02em; }
.vid-play {
  position: absolute; right: 14px; top: 12px; width: 42px; height: 42px; display: grid; place-items: center; border-radius: 50%;
  background: var(--volt); box-shadow: 0 0 0 6px rgba(59,130,255,.2); transition: transform .2s;
}
.vid-play svg { width: 18px; height: 18px; fill: #050a18; margin-left: 2px; }
.vid:hover .vid-play { transform: scale(1.1); }
.vid-time { position: absolute; left: 14px; bottom: 14px; padding: 4px 8px; border-radius: 6px; background: rgba(5,10,24,.7); color: #c9d7ff; font: 600 11px var(--font-mono); }
.vid-meta { display: grid; gap: 4px; padding: 0 4px; }
.vid-q { font: 600 12px var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.vid-title { font: 600 21px/1.15 var(--font-display); }
/* thumbnail art */
.va-ground, .va-ground-line { fill: rgba(201,215,255,.35); stroke: rgba(201,215,255,.35); stroke-width: 2; }
.va-shape { fill: #24418a; stroke: #8db6ff; stroke-width: 2; }
.va-win { fill: rgba(141,182,255,.35); }
.va-wheel { fill: #050a18; stroke: #8db6ff; stroke-width: 2; }
.va-speed { stroke: #8db6ff; stroke-width: 3; stroke-linecap: round; opacity: .6; }
.va-amber { fill: var(--amber); filter: drop-shadow(0 0 6px var(--amber)); }
.va-amber-line { stroke: var(--amber); stroke-width: 3; stroke-linecap: round; }
.va-q { font: 700 64px var(--font-display); fill: rgba(141,182,255,.28); }
.va-dash { fill: none; stroke: #8db6ff; stroke-width: 3; stroke-dasharray: 6 7; stroke-linecap: round; }
.va-arrow { stroke: var(--volt); stroke-width: 4; stroke-linecap: round; filter: drop-shadow(0 0 6px rgba(59,130,255,.8)); }
.va-tipfill { fill: var(--volt); }
.va-dial { fill: none; stroke: rgba(141,182,255,.2); stroke-width: 12; stroke-linecap: round; }
.va-dial-on { fill: none; stroke: var(--volt); stroke-width: 12; stroke-linecap: round; filter: drop-shadow(0 0 6px rgba(59,130,255,.7)); }
.va-needle { stroke: #fff; stroke-width: 4; stroke-linecap: round; }
.va-unit { font: 600 13px var(--font-mono); fill: #8db6ff; }
.va-dot { fill: #8db6ff; }
.va-move { transition: transform .5s; }
.vid:hover .va-move { transform: translateX(10px); }

/* video player dialog */
.vp { width: min(1180px, 100% - 24px); max-height: 94vh; padding: 0; border: 0; border-radius: 26px; background: var(--navy-950); color: #e9eefc; box-shadow: 0 50px 120px -30px rgba(0,0,0,.8); --line: rgba(141,182,255,.14); --line-2: rgba(141,182,255,.26); --accent: var(--volt); --accent-ink: #050a18; --ink-3: #7f8db5; }
.vp::backdrop { background: rgba(5,10,24,.75); backdrop-filter: blur(6px); }
.vp-inner { padding: 22px clamp(16px, 3vw, 28px) 28px; }
.vp-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 16px; }
.vp-head h2 { margin: 0; font: 600 clamp(24px, 3vw, 34px)/1.05 var(--font-display); }
.vp-head .kicker { margin-bottom: 8px; }
.vp-body { display: grid; grid-template-columns: minmax(0, 1fr) 290px; gap: 20px; }
@media (max-width: 900px) { .vp-body { grid-template-columns: minmax(0, 1fr); } }
.vp-stage { position: relative; border-radius: 16px; overflow: hidden; background: #000; aspect-ratio: 16 / 9; }
.vp-frame, .vp-frame > *, .vp-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.vp-check {
  position: absolute; inset: 0; z-index: 2; display: grid; align-content: center; justify-items: start; gap: 12px; padding: clamp(18px, 4vw, 48px);
  background: linear-gradient(160deg, rgba(14,26,61,.97), rgba(5,10,24,.97)); overflow: auto;
}
.vp-check[hidden] { display: none; }
.vp-eyebrow { margin: 0; font: 700 11px/1 var(--font-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--amber); }
.vp-q { margin: 0; max-width: 32ch; font: 600 clamp(20px, 2.6vw, 30px)/1.2 var(--font-display); }
.vp-opts { display: grid; gap: 8px; width: min(520px, 100%); }
.vp-opts button, .vq-opts button {
  padding: 13px 16px; border-radius: 12px; border: 1px solid var(--line-2); background: rgba(141,182,255,.06);
  text-align: left; font-weight: 600; font-size: 16px; cursor: pointer; transition: border-color .15s, background .15s;
}
.vp-opts button:hover:not(:disabled), .vq-opts button:hover:not(:disabled) { border-color: var(--accent); }
.vp-opts button:disabled, .vq-opts button:disabled { cursor: default; opacity: .55; }
.vp-opts .right, .vq-opts .right { opacity: 1 !important; border-color: #3ccf8e; background: rgba(60,207,142,.15); }
.vp-opts .wrong, .vq-opts .wrong { opacity: 1 !important; border-color: #ff6b6b; background: rgba(255,107,107,.12); }
.vp-why { margin: 0; max-width: 56ch; color: #c9d7ff; }
.vp-why b { color: #fff; }
.vp-actions { display: flex; gap: 10px; }
.vp-actions[hidden] { display: none; }
.vp-side h3 { margin: 0 0 12px; font: 700 11px/1 var(--font-mono); letter-spacing: .14em; text-transform: uppercase; color: #7f8db5; }
.vp-chapters { margin: 0 0 16px; padding: 0; list-style: none; display: grid; gap: 6px; }
.vp-chapters button {
  width: 100%; display: grid; grid-template-columns: 46px 1fr 18px; gap: 8px; align-items: center; padding: 11px 12px; border-radius: 12px;
  border: 1px solid var(--line); background: transparent; text-align: left; cursor: pointer; font-size: 14px; font-weight: 600;
}
.vp-chapters button:hover { border-color: var(--accent); }
.vp-chapters .next button { border-color: var(--accent); background: rgba(59,130,255,.1); }
.vp-chapters .done button { color: #9aa8cf; }
.vp-ct { font: 600 12px var(--font-mono); color: var(--volt-soft); }
.vp-ok { color: #3ccf8e; }
.vp-note { margin: 16px 0 8px; font-size: 13px; color: #7f8db5; }
.vp-source { font-size: 14px; font-weight: 700; color: var(--volt-soft); text-decoration: none; }

/* ---------- sketchnotes ---------- */
.sk-feature { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
@media (max-width: 900px) { .sk-feature { grid-template-columns: minmax(0, 1fr); } }
.skf { border-radius: 22px; overflow: hidden; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); }
.skf-img { position: relative; display: block; aspect-ratio: 4 / 4.2; overflow: hidden; background: #fff; }
.skf-img img { width: 100%; height: 100%; object-fit: cover; object-position: top; transition: transform .5s; }
.skf-img:hover img { transform: scale(1.04); }
.skf-cta {
  position: absolute; left: 14px; bottom: 14px; display: inline-flex; align-items: center; gap: 8px; padding: 10px 16px; border-radius: 999px;
  background: var(--navy-900); color: #fff; font-weight: 700; font-size: 15px; box-shadow: 0 10px 24px -10px rgba(5,10,24,.7);
}
.skf-cta svg { width: 18px; height: 18px; fill: none; stroke: var(--volt-soft); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.skf-body, .skr-body { padding: 18px 20px 20px; }
.skf-body h3, .skr-body h3 { margin: 0 0 6px; font: 600 22px/1.15 var(--font-display); }
.skf-body p, .skr-body p { margin: 0 0 12px; color: var(--ink-2); font-size: 15px; }
.chips { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin: 0 0 8px !important; }
.chips span { font: 600 10px var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); min-width: 44px; }
.chips a { padding: 5px 11px; border-radius: 999px; border: 1px solid var(--line-2); text-decoration: none; font-size: 13px; font-weight: 600; }
.chips a:hover { border-color: var(--accent); color: var(--accent); }
.sk-more { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
@media (max-width: 1000px) { .sk-more { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 520px) { .sk-more { grid-template-columns: minmax(0, 1fr); } }
.skr { border-radius: 18px; overflow: hidden; background: var(--surface); border: 1px solid var(--line); }
.skr-img { display: block; aspect-ratio: 16 / 10; overflow: hidden; background: #fff; }
.skr-img img { width: 100%; height: 100%; object-fit: cover; object-position: top; transition: transform .5s; }
.skr-img:hover img { transform: scale(1.05); }
.skr-body h3 { font-size: 18px; }
.skr-body p { font-size: 14px; }

/* ---------- vocabulary ---------- */
.vb-groups { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
.vb-groups button { padding: 10px 16px; border-radius: 999px; border: 1px solid var(--line-2); background: var(--surface); cursor: pointer; font-weight: 600; font-size: 15px; }
.vb-groups button span { margin-left: 6px; font: 600 12px var(--font-mono); color: var(--ink-3); }
.vb-groups button[aria-selected="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.vb-groups button[aria-selected="true"] span { color: inherit; opacity: .6; }
.vb-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.vb-cards[hidden], .vb-quiz[hidden], .vb-practice[hidden], .vb-list[hidden] { display: none; }
.vc { position: relative; height: 210px; padding: 0; border: 0; background: none; cursor: pointer; perspective: 1000px; text-align: left; }
.vc-face {
  position: absolute; inset: 0; display: flex; flex-direction: column; padding: 18px; border-radius: 18px; backface-visibility: hidden;
  transition: transform .5s cubic-bezier(.2,.8,.2,1);
}
.vc-front { background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); }
.vc-back { background: linear-gradient(150deg, var(--navy-700), var(--navy-900)); color: #e9eefc; transform: rotateY(180deg); overflow: auto; }
.vc[aria-pressed="true"] .vc-front { transform: rotateY(-180deg); }
.vc[aria-pressed="true"] .vc-back { transform: rotateY(0); }
.vc-n { display: flex; justify-content: space-between; align-items: center; font: 600 12px var(--font-mono); color: var(--accent); }
.vc-word { margin-top: auto; font: 600 26px/1.05 var(--font-display); letter-spacing: -.01em; }
.vc-hint { margin-top: 8px; font: 500 11px var(--font-mono); color: var(--ink-3); letter-spacing: .06em; text-transform: uppercase; }
.vc-word-sm { font: 700 11px var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--volt-soft); margin-bottom: 8px; }
.vc-def { font-size: 15px; line-height: 1.45; }
.vc-ex { margin-top: auto; padding-top: 10px; font-size: 13px; color: #aab6d6; border-top: 1px solid rgba(141,182,255,.2); }
.vc:hover .vc-front { border-color: var(--accent); }
.vb-quiz { max-width: 760px; }
.vq-card { padding: clamp(22px, 4vw, 36px); border-radius: 24px; background: linear-gradient(150deg, var(--navy-800), var(--navy-950)); color: #e9eefc; box-shadow: var(--shadow); --line-2: rgba(141,182,255,.26); --accent: var(--volt); --accent-ink: #050a18; }
.vq-eyebrow { display: flex; justify-content: space-between; gap: 12px; margin: 0 0 14px; font: 700 11px/1 var(--font-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--amber); }
.vq-eyebrow span { color: #9aa8cf; }
.vq-def { margin: 0 0 20px; font: 600 clamp(22px, 2.8vw, 30px)/1.25 var(--font-display); }
.vq-opts { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (max-width: 520px) { .vq-opts { grid-template-columns: 1fr; } }
.vq-ex { margin: 16px 0 0; color: #c9d7ff; }
.vq-ex b { color: #fff; }
.vq-next { margin-top: 16px; }
.vq-next[hidden] { display: none; }
.vb-bridge { margin: 36px 0 0; color: var(--ink-2); }
.vb-bridge a { color: var(--accent); font-weight: 700; text-decoration: none; }

/* ---------- workshops ---------- */
.ws-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
@media (max-width: 860px) { .ws-grid { grid-template-columns: minmax(0, 1fr); } }
.ws { display: flex; flex-direction: column; padding: clamp(22px, 3vw, 32px); border-radius: 24px; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); }
.ws-hard { background: linear-gradient(150deg, var(--navy-800), var(--navy-950)); color: #e9eefc; border-color: transparent; --line: rgba(141,182,255,.16); --line-2: rgba(141,182,255,.3); --accent: var(--volt); --accent-ink: #050a18; --ink-3: #7f8db5; }
.ws-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; }
.ws-num { font: 700 48px/1 var(--font-display); color: var(--accent); letter-spacing: -.03em; }
.ws-level { font: 600 11px var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.ws h3 { margin: 0 0 16px; font: 600 26px/1.15 var(--font-display); }
.ws-list { margin: 0 0 24px; padding: 0; list-style: none; counter-reset: p; display: grid; grid-template-columns: 1fr 1fr; gap: 8px 16px; }
.ws-list li { counter-increment: p; display: flex; gap: 10px; font-size: 15px; padding: 8px 0; border-top: 1px solid var(--line); }
.ws-list li::before { content: counter(p, decimal-leading-zero); font: 600 12px/1.9 var(--font-mono); color: var(--accent); }
@media (max-width: 520px) { .ws-list { grid-template-columns: 1fr; } }
.ws-actions { margin-top: auto; display: flex; flex-wrap: wrap; gap: 10px; }

/* ---------- footer ---------- */
.foot { padding: 36px 0 48px; border-top: 1px solid var(--line); }
.foot-row { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 16px; }
.foot-note { font: 500 13px var(--font-mono); color: var(--ink-3); }
.foot a { color: var(--accent); font-weight: 700; text-decoration: none; }

/* ---------- passport dialog ---------- */
.pp { width: min(860px, 100% - 32px); max-height: min(88vh, 900px); padding: 0; border: 0; border-radius: 26px; background: var(--surface); color: var(--ink); box-shadow: 0 50px 120px -30px rgba(5,10,24,.7); }
.pp::backdrop { background: rgba(5,10,24,.6); backdrop-filter: blur(6px); }
.pp-inner { padding: 30px clamp(20px, 4vw, 40px) 36px; }
.pp-head { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; }
.pp-head h2 { margin: 0; font: 600 clamp(30px, 4vw, 42px)/1.05 var(--font-display); letter-spacing: -.02em; }
.pp-close { flex: none; width: 42px; height: 42px; border-radius: 50%; border: 1px solid var(--line-2); background: transparent; cursor: pointer; }
.pp-tabs { margin: 22px 0 26px; }
.pp-q { padding: 26px; border-radius: 20px; color: #e9eefc; background: linear-gradient(145deg, var(--navy-700), var(--navy-900)); }
.pp-q span { font: 600 11px/1 var(--font-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--volt-soft); }
.pp-q p { margin: 10px 0 0; font: 600 clamp(24px, 3vw, 32px)/1.15 var(--font-display); }
.pp-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 14px; }
@media (max-width: 640px) { .pp-grid { grid-template-columns: 1fr; } }
.pp-box { padding: 20px 22px; border-radius: 18px; background: var(--surface-2); border: 1px solid var(--line); }
.pp-box h3 { margin: 0 0 10px; font: 600 12px/1 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }
.pp-box p, .pp-box li { margin: 0; color: var(--ink-2); font-size: 16px; }
.pp-box ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.pp-box li { display: flex; gap: 10px; }
.pp-box li::before { content: ""; flex: none; width: 8px; height: 8px; margin-top: 8px; border-radius: 2px; background: var(--accent); }
.pp-section { margin-top: 26px; }
.pp-section > h3 { margin: 0 0 12px; font: 600 22px/1.1 var(--font-display); }
.pp-item { display: grid; grid-template-columns: 96px 1fr; gap: 6px 16px; padding: 16px 0; border-top: 1px solid var(--line); }
.pp-code { font: 700 13px/1.3 var(--font-mono); color: var(--accent); }
.pp-item h4 { margin: 0; font-size: 17px; }
.pp-role { display: inline-block; margin-top: 4px; font: 500 11px/1.3 var(--font-mono); color: var(--ink-3); text-transform: uppercase; letter-spacing: .06em; }
.pp-item p { grid-column: 2; margin: 0; color: var(--ink-2); font-size: 15px; }
.pp-item blockquote { grid-column: 2; margin: 4px 0 0; padding-left: 14px; border-left: 3px solid var(--accent); color: var(--ink); font-size: 15px; }
.pp-sources { margin-top: 22px; font: 500 12px/1.6 var(--font-mono); color: var(--ink-3); }
.pp-sources a { color: var(--accent); }
@media (max-width: 560px) { .pp-item { grid-template-columns: 1fr; } .pp-item p, .pp-item blockquote { grid-column: 1; } }

/* ---------- flight report ---------- */
.fr { width: min(980px, 100% - 24px); max-height: 94vh; padding: 0; border: 0; border-radius: 26px; background: var(--navy-950); color: #e9eefc; box-shadow: 0 50px 120px -30px rgba(0,0,0,.8);
  --line: rgba(141,182,255,.14); --line-2: rgba(141,182,255,.26); --accent: var(--volt); --accent-ink: #050a18; --ink-2: #aab6d6; --ink-3: #7f8db5; }
.fr::backdrop { background: rgba(5,10,24,.75); backdrop-filter: blur(6px); }
.fr-inner { padding: 22px clamp(16px, 3vw, 30px) 28px; }
.fr-stats { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; margin-bottom: 16px; }
@media (max-width: 760px) { .fr-stats { grid-template-columns: repeat(3, 1fr); } }
.fr-stats div { padding: 10px 12px; border-radius: 12px; background: rgba(141,182,255,.06); border: 1px solid var(--line); }
.fr-stats span { display: block; margin-bottom: 6px; font: 600 10px/1 var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: #7f8db5; }
.fr-stats b { font: 700 17px/1 var(--font-mono); }
.fr-tabs { margin-bottom: 12px; flex-wrap: wrap; }
.fr-chart { border-radius: 18px; background: rgba(5,10,24,.6); border: 1px solid var(--line); padding: 10px 10px 4px; }
.fr-chart svg { display: block; width: 100%; height: auto; touch-action: none; }
.fr-grid { stroke: rgba(141,182,255,.08); }
.fr-gate { stroke: var(--amber); stroke-width: 1.2; stroke-dasharray: 3 4; opacity: .55; }
.fr-ghost { fill: none; stroke: rgba(201,215,255,.28); stroke-width: 2; stroke-dasharray: 2 4; }
.fr-line { fill: none; stroke-width: 3; stroke-linejoin: round; stroke-linecap: round; filter: drop-shadow(0 0 5px currentColor); }
.fr-crossline { stroke: rgba(233,238,252,.5); stroke-width: 1; }
.fr-dot { fill: #fff; stroke-width: 3; }
.fr-read { margin: 6px 8px 8px; min-height: 1.5em; font: 500 13px var(--font-mono); color: #c9d7ff; }
.fr-read b { color: #fff; }
.fr-caption { margin: 14px 4px 0; max-width: 70ch; color: #c9d7ff; }
.fr-caption b { color: #fff; }
.fr-actions { margin-top: 16px; }

/* vocabulary: progress, practice, list */
.vb-progress { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; margin-bottom: 22px; padding: 16px 20px; border-radius: 18px; background: var(--surface); border: 1px solid var(--line); }
.vbp-text { display: grid; gap: 2px; }
.vbp-text b { font: 600 19px/1.2 var(--font-display); }
.vbp-text span { font-size: 14px; color: var(--ink-3); }
.vbp-text em { font-style: normal; color: var(--amber); font-weight: 700; }
.vbp-save { display: flex; align-items: center; gap: 10px; padding: 8px 14px 8px 10px; border-radius: 12px; border: 1px solid var(--line-2); cursor: pointer; }
.vbp-save:hover { border-color: var(--accent); }
.vbp-save input { width: 20px; height: 20px; margin: 0; accent-color: #3ccf8e; cursor: pointer; }
.vbp-save span { display: grid; font-size: 12px; color: var(--ink-3); line-height: 1.3; }
.vbp-save b { font-size: 14px; color: var(--ink); }
.vbp-bar { flex: 1; min-width: 200px; height: 12px; display: flex; border-radius: 999px; overflow: hidden; background: color-mix(in srgb, var(--accent) 10%, transparent); }
.vbp-bar i { display: block; height: 100%; transition: width .5s; }
.vbp-bar .k { background: #3ccf8e; }
.vbp-bar .l { background: var(--amber); }
.pips { display: inline-flex; gap: 4px; }
.pips i { width: 8px; height: 8px; border-radius: 50%; background: color-mix(in srgb, var(--ink-3) 35%, transparent); }
.pips i.on { background: #3ccf8e; box-shadow: 0 0 6px rgba(60,207,142,.6); }

.vpr-wrap { max-width: 720px; }
.vpr-win { margin: 0 0 14px; padding: 12px 16px; border-radius: 12px; background: rgba(60,207,142,.12); border: 1px solid rgba(60,207,142,.35); font-weight: 600; }
.vpr-card { position: relative; display: block; width: 100%; height: 300px; padding: 0; border: 0; background: none; cursor: pointer; perspective: 1400px; text-align: left; }
.vpr-face { position: absolute; inset: 0; display: flex; flex-direction: column; padding: clamp(22px, 4vw, 36px); border-radius: 24px; backface-visibility: hidden; transition: transform .55s cubic-bezier(.2,.8,.2,1); }
.vpr-front { background: var(--surface); border: 1px solid var(--line-2); box-shadow: var(--shadow); }
.vpr-back { background: linear-gradient(150deg, var(--navy-700), var(--navy-900)); color: #e9eefc; transform: rotateY(180deg); }
.vpr-card[aria-pressed="true"] .vpr-front { transform: rotateY(-180deg); }
.vpr-card[aria-pressed="true"] .vpr-back { transform: rotateY(0); }
.vpr-top { display: flex; justify-content: space-between; align-items: center; }
.vpr-tag { font: 700 11px/1 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); }
.vpr-tag.new { color: var(--ink-3); }
.vpr-tag.review { color: var(--volt); } .vpr-tag.learning { color: var(--amber); } .vpr-tag.known { color: #3ccf8e; }
.vpr-back .vpr-tag { color: var(--volt-soft); }
.vpr-word { margin: auto 0; font: 700 clamp(40px, 6vw, 64px)/1 var(--font-display); letter-spacing: -.03em; }
.vpr-hint { font-size: 15px; color: var(--ink-3); }
.vpr-def { margin-top: 18px; font: 600 clamp(20px, 2.6vw, 26px)/1.3 var(--font-display); }
.vpr-ex { margin-top: auto; padding-top: 14px; border-top: 1px solid rgba(141,182,255,.2); color: #c9d7ff; font-size: 16px; }
.vpr-ex b { display: block; margin-bottom: 4px; font: 700 11px var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--volt-soft); }
.vpr-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
.vpr-rate { flex: 1; min-width: 160px; padding: 14px 18px; border-radius: 14px; border: 1px solid; font-weight: 700; font-size: 16px; cursor: pointer; }
.vpr-rate[hidden] { display: none; }
.vpr-rate.again { border-color: var(--amber); background: color-mix(in srgb, var(--amber) 12%, transparent); }
.vpr-rate.got { border-color: #3ccf8e; background: color-mix(in srgb, #3ccf8e 14%, transparent); }
.vpr-rate:hover { filter: brightness(1.15); }
.vpr-meta { margin: 12px 2px 0; font: 500 13px var(--font-mono); color: var(--ink-3); }

.vl-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 18px; }
.vl-search { flex: 1; min-width: 220px; padding: 12px 16px; border-radius: 999px; border: 1px solid var(--line-2); background: var(--surface); color: var(--ink); font: inherit; font-size: 16px; }
.vl-search:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.vl-group { margin-bottom: 28px; }
.vl-group h3 { margin: 0 0 8px; font: 600 22px/1.1 var(--font-display); }
.vl-group dl { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 28px; }
@media (max-width: 760px) { .vl-group dl { grid-template-columns: minmax(0, 1fr); } }
.vl-row { padding: 14px 0; border-top: 1px solid var(--line); }
.vl-row dt { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.vl-row dd { margin: 4px 0 0; color: var(--ink-2); font-size: 15px; }
.vl-row dd span { display: block; margin-top: 4px; font-size: 14px; color: var(--ink-3); }
.vl-tag { padding: 2px 8px; border-radius: 999px; font: 700 10px var(--font-mono); letter-spacing: .08em; text-transform: uppercase; border: 1px solid currentColor; }
.vl-tag.new { color: var(--ink-3); } .vl-tag.learning { color: var(--amber); } .vl-tag.known { color: #3ccf8e; }
.vl-empty { color: var(--ink-3); }

/* ---------- articles ---------- */
.art-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
@media (max-width: 720px) { .art-grid { grid-template-columns: minmax(0, 1fr); } }
.art { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 18px; align-items: center; padding: 14px; border-radius: 22px; border: 1px solid var(--line); background: var(--surface); box-shadow: var(--shadow); text-align: left; cursor: pointer; transition: border-color .2s, transform .2s; }
.art:hover { border-color: var(--accent); transform: translateY(-3px); }
@media (max-width: 460px) { .art { grid-template-columns: minmax(0, 1fr); } }
.art-thumb { position: relative; display: block; aspect-ratio: 16 / 10; border-radius: 14px; overflow: hidden; background: linear-gradient(150deg, var(--navy-700), var(--navy-950) 75%); }
.art-thumb > svg:first-child { position: absolute; inset: 0; width: 100%; height: 100%; }
.art-bot { position: absolute; right: 6px; bottom: 4px; width: 56%; height: auto; --bot-shell: #1b2f66; --bot-shell-hi: #4f78d8; --bot-edge: #8db6ff; --bot-limb: #c9d7ff; --bot-limb-far: #4a5f99; --bot-eye: #6aa3ff; }
.art-meta { display: grid; gap: 6px; }
.art-kicker { font: 600 11px var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--accent); }
.art-title { font: 600 24px/1.1 var(--font-display); letter-spacing: -.01em; }
.art-sub { font-size: 14px; color: var(--ink-3); }

.ar { width: min(860px, 100% - 16px); height: min(94vh, 1100px); max-height: none; padding: 0; border: 0; border-radius: 26px; background: var(--surface); color: var(--ink); box-shadow: 0 50px 120px -30px rgba(5,10,24,.75); overflow: hidden; }
.ar[open] { display: flex; flex-direction: column; }
.ar::backdrop { background: rgba(5,10,24,.65); backdrop-filter: blur(6px); }
.ar-progress { height: 4px; background: var(--line); flex: none; }
.ar-progress i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .1s; }
.ar-head { flex: none; display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; padding: 20px clamp(18px, 4vw, 44px) 14px; border-bottom: 1px solid var(--line); }
.ar-head h2 { margin: 0; font: 600 clamp(28px, 4vw, 40px)/1.05 var(--font-display); letter-spacing: -.02em; }
.ar-head .kicker { margin-bottom: 8px; }
.ar-tools { display: flex; gap: 8px; align-items: center; }
.ar-scroll { flex: 1; overflow-y: auto; padding: 26px clamp(18px, 4vw, 44px) 40px; }
.ar-body { max-width: 66ch; margin: 0 auto; font-size: 19px; line-height: 1.65; }
.ar-body > p:first-child::first-letter { float: left; margin: 6px 10px 0 0; font: 700 64px/.8 var(--font-display); color: var(--accent); }
.ar-body h3 { margin: 34px 0 10px; font: 600 26px/1.15 var(--font-display); letter-spacing: -.01em; }
.ar-body p { margin: 0 0 16px; }
.ar-body ul { margin: 0 0 16px; padding-left: 22px; }
.ar-body li { margin-bottom: 8px; }
.ar-big { margin: 24px 0 !important; padding: 18px 22px; border-radius: 16px; border-left: 5px solid var(--accent); background: color-mix(in srgb, var(--accent) 9%, transparent); font-size: 21px; }
.ar-eq { text-align: center; font: 700 22px var(--font-mono); color: var(--accent); }
.ar-one { margin-top: 30px !important; padding: 16px 20px; border-radius: 14px; background: var(--surface-2); border: 1px solid var(--line); }
.ar-sign { font-style: italic; color: var(--ink-3); }
.ar-fig { margin: 26px 0; }
.ar-fig figcaption { margin-top: 8px; font-size: 14px; color: var(--ink-3); text-align: center; }
.ar-static svg { display: block; width: 100%; height: auto; padding: 14px; border-radius: 18px; background: linear-gradient(160deg, var(--navy-850), var(--navy-950)); }
.ar-widget { padding: 18px; border-radius: 20px; background: linear-gradient(160deg, var(--navy-850), var(--navy-950)); color: #e9eefc; font-size: 15px; line-height: 1.5;
  --line: rgba(141,182,255,.16); --accent: var(--volt); --accent-ink: #050a18;
  --bot-shell: #1b2f66; --bot-shell-hi: #4f78d8; --bot-edge: #8db6ff; --bot-limb: #c9d7ff; --bot-limb-far: #4a5f99; --bot-eye: #6aa3ff; }
.ar-wtitle { margin: 0 0 10px !important; font: 700 11px var(--font-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--amber); }
.ar-seg { margin-bottom: 12px; flex-wrap: wrap; }
.ar-seg button { color: #c9d7ff; }
.ar-wsvg { display: block; width: 100%; height: auto; border-radius: 14px; background: rgba(5,10,24,.55); border: 1px solid var(--line); }
.ar-wread { margin: 12px 2px 0 !important; min-height: 3em; font: 500 14px/1.5 var(--font-mono); color: #c9d7ff; }
.ar-wread b { color: var(--volt-soft); } .ar-wread .amb { color: var(--amber); }
.ar-sliders { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 20px; margin-bottom: 12px; }
@media (max-width: 560px) { .ar-sliders { grid-template-columns: 1fr; } }
.ar-sliders label { display: grid; gap: 6px; color: #aab6d6; }
.ar-sliders output { font: 700 14px var(--font-mono); color: var(--volt-soft); }
.ar-sliders input { width: 100%; accent-color: var(--volt); }
.ar-path { fill: none; stroke: #8db6ff; stroke-width: 3; stroke-dasharray: 7 7; stroke-linejoin: round; }
.ar-disp, .ar-dispw { stroke: var(--amber); stroke-width: 4; stroke-linecap: round; fill: none; }
.ar-leg { stroke: #8db6ff; stroke-width: 3; stroke-linecap: round; fill: none; }
.ar-leg.thin { stroke-width: 1.5; stroke-dasharray: 3 4; }
.ar-start { fill: #3ccf8e; } .ar-end { fill: var(--amber); }
.ar-lbl { fill: #c9d7ff; font: 600 13px var(--font-mono); }
.ar-lbl.amber, .tick-label.amb { fill: var(--amber); }
.ar-vel { stroke: var(--volt); stroke-width: 4; stroke-linecap: round; }
.ar-snap { fill: #8db6ff; }
.ar-checks { max-width: 66ch; margin: 40px auto 0; padding: 24px; border-radius: 22px; background: linear-gradient(150deg, var(--navy-800), var(--navy-950)); color: #e9eefc; --line-2: rgba(141,182,255,.26); --accent: var(--volt); }
.ar-checks h3 { margin: 0 0 16px; font: 600 24px/1.1 var(--font-display); }
.ar-q { margin-bottom: 20px; }
.ar-qtext { margin: 0 0 10px; font-weight: 600; font-size: 17px; }
.ar-q .vp-opts { width: 100%; }
.ar-q .vp-why { margin-top: 10px; font-size: 15px; }
.ar-score { margin: 4px 0 0; font: 700 15px var(--font-mono); color: var(--amber); }
.ar-next { max-width: 66ch; margin: 22px auto 0; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; }

/* phenomenon structure */
.ar-tag { margin: 0 0 10px !important; font: 700 11px var(--font-mono); letter-spacing: .14em; text-transform: uppercase; color: var(--amber); }
.ar-phen, .ar-back { margin: 0 0 8px; padding: 22px 24px 6px; border-radius: 20px; background: var(--surface-2); border: 1px solid var(--line); }
.ar-back { margin-top: 32px; border-left: 5px solid var(--amber); }
.ar-phen > .ar-tag + p::first-letter { float: left; margin: 6px 10px 0 0; font: 700 60px/.8 var(--font-display); color: var(--accent); }
.ar-body > p:first-child::first-letter { float: none; margin: 0; font: inherit; color: inherit; }
.ar-predict { margin: 6px 0 18px; padding: 18px; border-radius: 18px; background: linear-gradient(160deg, var(--navy-850), var(--navy-950)); color: #e9eefc; --line-2: rgba(141,182,255,.26); --accent: var(--volt); font-size: 16px; }
.ar-pq { margin: 0 0 12px !important; font-weight: 600; }
.ar-predict .vp-opts { width: 100%; }
.ar-predict .picked { border-color: var(--amber); background: rgba(255,178,46,.14); }
.ar-pnote { margin: 10px 0 0 !important; font: 500 13px var(--font-mono); color: #9aa8cf; }
.ar-reveal { margin-bottom: 14px; padding: 14px 16px; border-radius: 14px; background: color-mix(in srgb, var(--amber) 12%, transparent); font-size: 17px; }
.ar-reveal p { margin: 0 0 6px !important; } .ar-reveal p:last-child { margin: 0 !important; }
.ar-passport { margin-top: 26px; padding-top: 20px; border-top: 1px solid rgba(141,182,255,.2); }
.ar-ppq { margin: 0 0 10px; }
.ar-passport ul { margin: 0 0 10px; padding: 0; list-style: none; display: grid; gap: 6px; }
.ar-passport li { display: flex; gap: 10px; }
.ar-passport li::before { content: "✓"; color: #3ccf8e; font-weight: 700; }
.ar-ppf { margin: 0 0 14px; font-size: 14px; color: #9aa8cf; }
.ar-passport .btn-ghost { color: #e9eefc; }
.ar-preset { margin: 0 0 12px; color: #e9eefc; font-size: 14px; }
.ar-shape { fill: #24418a; stroke: #8db6ff; stroke-width: 2; }
.ar-shape2 { fill: #13224d; stroke: #8db6ff; stroke-width: 2; stroke-dasharray: 6 5; }
.ar-track { fill: #8a3b2a; opacity: .55; } .ar-track-in { fill: #0e1a3d; }
.ar-line { stroke: #fff; stroke-width: 3; } .ar-line.faint { stroke: rgba(201,215,255,.2); stroke-width: 1; stroke-dasharray: 3 5; }
.ar-ball { fill: var(--amber); }

/* legacy anchors from the previous Motion page */
.anchor-alias { display: block; height: 0; overflow: hidden; }

/* scene primitives used by Reading figures (restored: lost in an earlier stylesheet rewrite) */
.ground-line { stroke: rgba(201,215,255,.45); stroke-width: 2; }
.ground-tick { stroke: rgba(201,215,255,.25); stroke-width: 2; }
.post { fill: #4a5f99; }
.post-light { fill: var(--amber); filter: drop-shadow(0 0 8px var(--amber)); }
.cart { fill: #24418a; stroke: #8db6ff; stroke-width: 1.5; }
.wheel { fill: #0a1430; stroke: #8db6ff; stroke-width: 2.5; }
.ws-text { margin: 0 0 20px; color: var(--ink-2); }

/* on-device personal-best list (games) */
.hs { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; width: min(360px, 100%); text-align: left; }
.hs li { display: grid; grid-template-columns: 22px 1fr auto auto; gap: 10px; align-items: baseline; padding: 6px 10px; border-radius: 10px; background: rgba(141,182,255,.06); border: 1px solid rgba(141,182,255,.14); font-size: 13px; color: #c9d7ff; }
.hs li.new { border-color: var(--amber); background: rgba(255,178,46,.14); }
.hs b { font: 700 15px var(--font-mono); color: #fff; }
.hs-rank { font: 700 12px var(--font-mono); color: var(--amber); }
.hs-detail { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hs-date { font: 500 11px var(--font-mono); color: #7f8db5; }
.hs-empty { margin: 0; font-size: 13px; color: #9aa8cf; }
.fg-score { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-bottom: 8px; }
.fg-score div { padding: 8px 12px; border-radius: 12px; background: rgba(255,178,46,.08); border: 1px solid rgba(255,178,46,.28); }
.fg-score span { display: block; font: 600 10px/1 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: #c9a45a; margin-bottom: 5px; }
.fg-score b { font: 700 18px/1 var(--font-mono); color: #fff; }
.fg-score .hot b { color: var(--amber); }
.fg-score .low b { color: #ff6b6b; }
.fg-pop { position: absolute; left: 50%; top: 18%; transform: translateX(-50%); padding: 6px 14px; border-radius: 999px; background: rgba(5,10,24,.75); font: 700 15px var(--font-mono); color: var(--amber); pointer-events: none; opacity: 0; transition: opacity .2s; white-space: nowrap; }
.fg-pop.show { opacity: 1; }

/* Eleo Flight: read-your-graph quiz in the flight report */
.fr-quiz { margin-top: 16px; padding: 18px 20px; border-radius: 18px; background: linear-gradient(150deg, rgba(27,47,102,.6), rgba(5,10,24,.6)); border: 1px solid rgba(255,178,46,.35); display: grid; gap: 10px; justify-items: start; }
.fr-quiz[hidden] { display: none; }
.fr-q { margin: 0; font: 600 clamp(17px, 2.2vw, 21px)/1.3 var(--font-display); color: #fff; }
.fr-quiz .vp-opts { width: 100%; }
.fr-actions .btn-solid:disabled { opacity: .4; cursor: not-allowed; transform: none; box-shadow: none; }

/* Eleo Flight lives */
.fg-health { display: flex; align-items: center; gap: 12px; margin: -4px 0 12px; padding: 8px 12px; border-radius: 12px; background: rgba(141,182,255,.06); border: 1px solid var(--line); }
.fg-health span { font: 600 10px/1 var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: #7f8db5; }
.fg-lives { font-size: 17px; letter-spacing: .15em; color: #ff6b6b; }
.fg-lifemsg { font: 700 13px var(--font-mono); font-style: normal; color: var(--amber); }