/* The pre-run demo page: the companion page's navy + neon, phone-first, roomy on a projector. */
:root { --void: #02070F; --ink: #030A15; --deep: #061528; --navy: #0B2546; --mid: #4B9CD3; --neon: #E8FF3A; --neon-core: #F7FFC2;
  --muted: #A9C0D6; --line: rgba(75,156,211,.28); --coral: #FF6B57; }
* { box-sizing: border-box; }
html { background: var(--ink); -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--ink); color: #E6F1F9; font: 16px/1.55 "Open Sans", "Segoe UI", system-ui, sans-serif; overflow-x: clip; }
.d-top { display: flex; align-items: center; gap: 14px; padding: 12px 16px; border-bottom: 1px solid var(--line); background: rgba(3,10,21,.96); position: sticky; top: 0; z-index: 3; }
.d-back { color: #fff; text-decoration: none; font: 600 .9rem "Rubik", sans-serif; padding: 8px 10px; margin: -8px 0 -8px -10px; border-radius: 8px; }
.d-back:hover { color: var(--neon); }
.d-kicker { margin: 0; font: 700 .72rem/1.2 "Open Sans", sans-serif; letter-spacing: .14em; text-transform: uppercase; color: var(--neon); }
.d-main { max-width: 1120px; margin: 0 auto; padding: 16px 16px 48px; }

.d-tabs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.d-tabs button { display: flex; flex-direction: column; align-items: flex-start; gap: 2px; text-align: left; min-height: 60px; padding: 10px 12px; border-radius: 12px;
  border: 1.5px solid var(--line); background: rgba(7,24,48,.9); color: #fff; font: 600 .88rem/1.25 "Rubik", sans-serif; cursor: pointer; -webkit-tap-highlight-color: transparent; }
.d-tabs button b { font: 800 1.05rem "Rubik", sans-serif; color: var(--mid); }
.d-tabs button[aria-selected=true] { border-color: var(--neon); background: rgba(232,255,58,.1); }
.d-tabs button[aria-selected=true] b { color: var(--neon); }

.d-ask-k { margin: 22px 0 4px; font: 700 .72rem "Open Sans", sans-serif; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.d-ask { margin: 0 0 16px; font: 700 clamp(1.3rem, 4.6vw, 2.1rem)/1.2 "Rubik", sans-serif; color: #fff; text-wrap: balance; }

.d-switch { display: inline-grid; grid-template-columns: 1fr 1fr; padding: 4px; gap: 4px; border-radius: 12px; background: var(--void); border: 1px solid var(--line); width: 100%; max-width: 460px; }
.d-switch button { min-height: 46px; border: 0; border-radius: 9px; background: transparent; color: var(--muted); font: 700 .92rem "Rubik", sans-serif; cursor: pointer; padding: 0 10px; }
.d-switch button[aria-pressed=true] { background: #fff; color: var(--navy); }
body[data-mode=on] .d-switch button[aria-pressed=true] { background: var(--neon); color: #10170A; }
.d-tabs button:focus-visible, .d-switch button:focus-visible, .d-back:focus-visible, .d-skip:focus-visible { outline: 2px solid var(--neon); outline-offset: 2px; }

.d-video { position: relative; margin: 14px 0 0; aspect-ratio: 16 / 9; background: var(--void); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.d-video video { display: block; width: 100%; height: 100%; object-fit: contain; background: var(--void); }
.d-ph { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; padding: 16px;
  background: repeating-linear-gradient(135deg, rgba(75,156,211,.06) 0 14px, transparent 14px 28px), var(--deep); }
.d-ph[hidden] { display: none; }
.d-ph-k { margin: 0 0 6px; font: 800 clamp(1.1rem, 4vw, 1.8rem) "Rubik", sans-serif; color: #fff; }
.d-ph-f { margin: 0; font: .82rem ui-monospace, Consolas, Menlo, monospace; color: var(--muted); word-break: break-all; }
.d-notes { position: absolute; inset: 0; pointer-events: none; container-type: inline-size; }
.d-note { position: absolute; transform: translateY(-50%); padding: .3em .6em; border-radius: 6px; white-space: nowrap;
  background: var(--navy); color: #fff; font: 700 clamp(5.5px, 1.3cqw, 16px)/1.2 "Rubik", sans-serif;
  box-shadow: 0 0 0 2px var(--neon), 0 4px 14px rgba(2,7,15,.35); opacity: 0; transition: opacity .25s; }
.d-note::before { content: "\2190\00a0"; color: var(--neon); }
.d-note.d-speed { left: auto; right: 2%; top: 5%; transform: none; background: var(--neon); color: #10170A; box-shadow: none; }
.d-note.d-speed::before { content: none; }
.d-note.on { opacity: 1; }
.d-under { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.d-when { margin: 0; color: var(--muted); font-size: .85rem; }
.d-skip { min-height: 40px; padding: 0 14px; border-radius: 9px; border: 1.5px solid var(--line); background: var(--void); color: #fff;
  font: 700 .88rem "Rubik", sans-serif; cursor: pointer; }
.d-skip:hover { border-color: var(--neon); color: var(--neon); }
.d-saved { scroll-margin-top: 64px; }
.d-gpt { margin-top: 56px; padding-top: 28px; border-top: 3px solid var(--neon); scroll-margin-top: 56px; }
.d-gpt-h { margin: 0 0 4px; font: 800 clamp(1.9rem, 7vw, 3.2rem)/1.1 "Rubik", sans-serif; color: #fff; text-wrap: balance; }
.d-gpt-h span { color: var(--neon); }
.d-gpt .d-ask-k { margin-top: 18px; }
.d-gpt-ask { font-size: clamp(1.1rem, 3.6vw, 1.6rem); margin-bottom: 6px; }
.d-gpt-sub { margin: 0; color: var(--muted); }

.d-saved { margin-top: 22px; border: 1px solid var(--line); border-radius: 12px; background: rgba(7,24,48,.9); padding: 14px 16px; }
.d-saved-k { margin: 0 0 8px; font: 700 .72rem "Open Sans", sans-serif; letter-spacing: .14em; text-transform: uppercase; color: var(--neon); }
.d-saved-text { white-space: pre-wrap; word-break: break-word; font-size: .95rem; color: #E6F1F9; }
.d-saved-body img { display: block; max-width: 100%; height: auto; margin: 0 auto; border-radius: 6px; }
.d-saved-ph { margin: 0; color: var(--muted); font: .85rem ui-monospace, Consolas, Menlo, monospace; word-break: break-all; }

@media (min-width: 900px) {
  .d-main { padding-top: 24px; }
  .d-tabs button { font-size: 1rem; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }