/* ══════════════════════════════════════════════════════════════
   v3d.css · Lindner Technik & Design · 3D-Hero
   Greift NUR mit html.v3d (setzt das Kopf-Skript, wenn WebGL da ist,
   keine reduzierte Bewegung gewünscht und das Gerät nicht schwach ist).
   Ohne die Klasse sieht die Seite exakt aus wie die 2D-Fassung.

   Aufbau im 3D-Modus
   · .stage liegt absolut über dem ganzen Hero, darin klebt .stage-stick
     (Bildschirmhöhe) mit Poster-SVG, Canvas, Nummern und Bedienleiste.
   · Text und Stückliste scrollen als echtes HTML darüber hinweg.
   ══════════════════════════════════════════════════════════════ */

:root { --card: rgba(22,19,16,.88); --carTop: 30%; }
[data-theme="light"] { --card: rgba(251,249,245,.92); }

.v3d .hero { padding: 0; background-image: none; }
.v3d .hero::after { display: none; }
.v3d .hero > .wrap { position: relative; z-index: 1; pointer-events: none; }
.v3d .hero > .wrap :is(a, button, .h1, .lead, .parts-h) { pointer-events: auto; }

.v3d .stage { position: absolute; inset: 0; z-index: 0; }
.v3d .stage-stick {
  position: sticky; top: 64px; height: calc(100vh - 64px); height: calc(100svh - 64px); overflow: hidden; overflow: clip;
  --paper: 1;
  /* Studio: dunkel, ein warmes Licht hinter dem Wagen, Konstruktionsraster als Papier */
  background:
    radial-gradient(ellipse 48% 58% at 66% 60%, rgba(201,89,10,.14), transparent 70%),
    radial-gradient(ellipse 70% 40% at 62% 100%, rgba(240,236,230,.05), transparent 70%),
    var(--bg);
}
.v3d .stage-stick::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: var(--paper);
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px; background-position: -1px -1px;
}
.v3d-c { position: absolute; inset: 0; width: 100%; height: 100%; display: block; z-index: 1; opacity: 0; transition: opacity 1s var(--ease); touch-action: pan-y; cursor: grab; -webkit-tap-highlight-color: transparent; }
.v3d-c.grab { cursor: grabbing; }
.v3d-on .v3d-c { opacity: 1; }

/* Poster: die 2D-Zeichnung steht dort, wo gleich der 3D-Wagen erscheint */
.v3d .stage-wrap { position: absolute; inset: 0; max-width: none; padding: 0; }
.v3d .car { margin: 0; position: static; }
.v3d .car-in { position: absolute; left: 47%; width: 51%; top: 31%; transition: opacity .8s var(--ease) .15s; }
.v3d-on .car-in { opacity: 0; visibility: hidden; transition: opacity .8s var(--ease), visibility 0s .9s; }
.v3d .titleblock { position: absolute; right: var(--gut); top: 16px; margin: 0; z-index: 2; background: var(--bg); justify-content: flex-start; }

/* Erster Bildschirm: Text links, Wagen rechts */
.v3d .hero-top { min-height: calc(100svh - 64px); padding: clamp(28px, 7vh, 72px) 0 90px; grid-template-columns: minmax(0, 33rem); align-content: start; gap: clamp(16px, 3vh, 28px); }
.v3d .h1 { font-size: clamp(2.2rem, 3.75vw, 3.6rem); max-width: 9.6em; }
.v3d .hero-side { grid-template-columns: minmax(0, 1fr); gap: 1.3rem; }
.v3d .hero-side .lead { max-width: 29rem; }
.v3d .cta { justify-content: flex-start; }

/* Stückliste = Drehbuch: jedes Bauteil bekommt einen eigenen Bildschirm */
.v3d .parts { margin-top: 0; }
.v3d .parts-h {
  min-height: 72svh; margin: 0; display: flex; flex-direction: column; justify-content: center; gap: .7rem; max-width: 24rem;
  font-size: clamp(2rem, 3.4vw, 2.8rem); font-weight: 800; letter-spacing: -.035em; line-height: 1;
}
.v3d .parts-h span { font-size: 1.05rem; letter-spacing: 0; line-height: 1.5; color: var(--muted); }
.v3d .sl { display: block; border: 0; padding-bottom: 78svh; }
.v3d .sl li { border: 0; min-height: 88svh; display: flex; align-items: center; }
.v3d .sl button {
  width: min(25rem, 100%); height: auto; min-height: 0; padding: 1.25rem 1.35rem 1.35rem; row-gap: .35rem;
  background: var(--card); border: 1px solid var(--border); border-radius: 6px;
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  transition: border-color .35s, box-shadow .35s, transform .6s var(--spring), opacity .35s;
  transform: translateX(-10px) scale(.97); opacity: .6;
}
.v3d .sl b { width: 36px; height: 36px; font-size: .9rem; }
.v3d .sl span { font-size: 1.5rem; letter-spacing: -.02em; }
.v3d .sl em { font-size: 1.04rem; color: var(--muted); }
.v3d .sl li.on button { opacity: 1; transform: none; border-color: var(--accent-deep); box-shadow: inset 3px 0 0 var(--accent), 0 30px 70px -30px rgba(0,0,0,.8); }
.v3d .sl li.on b { background: var(--accent-deep); border-color: var(--accent-deep); color: #fff; transform: scale(1.12); }
.v3d .sl button:hover { background: var(--card); }

/* Prüfstempel landet am Ende der Fahrt, wenn der Wagen wieder steht */
.v3d .stamp { top: auto; bottom: 34svh; right: auto; left: max(var(--gut), calc((100vw - var(--wrap)) / 2 + var(--gut))); font-size: .95rem; padding: .7rem 1rem; }

/* Nummern wie im Teilekatalog, hängen am 3D-Bauteil */
.v3d-tags { position: absolute; inset: 0; z-index: 2; pointer-events: none; opacity: 0; transition: opacity .45s var(--ease); }
.v3d-tags.on { opacity: 1; }
.v3d-tags span {
  position: absolute; left: 0; top: 0; width: 30px; height: 30px; margin: -15px 0 0 -15px; border-radius: 50%;
  display: grid; place-items: center; font-family: var(--mono); font-weight: 700; font-size: .8rem; color: var(--text);
  background: var(--bg); border: 1.5px solid var(--ink-soft); will-change: transform; transition: background-color .3s, border-color .3s, box-shadow .3s;
}
.v3d-tags span.on { background: var(--accent-deep); border-color: var(--accent-deep); color: #fff; box-shadow: 0 0 0 7px rgba(201,89,10,.22), 0 0 24px rgba(232,112,31,.6); }

/* Bedienleiste */
.v3d-ui { position: absolute; right: var(--gut); bottom: 18px; z-index: 3; display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 6px; opacity: 0; transform: translateY(8px); transition: opacity .6s var(--ease) 1.4s, transform .6s var(--spring) 1.4s; }
.v3d-on .v3d-ui { opacity: 1; transform: none; }
.v3d-ui button {
  all: unset; box-sizing: border-box; cursor: pointer; display: inline-flex; align-items: center; gap: .5rem; min-height: 44px; padding: 0 .9rem 0 .75rem;
  border: 1px solid var(--border); border-radius: 22px; background: var(--card); color: var(--text);
  font-family: var(--mono); font-size: .75rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase;
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); transition: border-color .2s, color .2s, background-color .2s, transform .35s var(--spring);
}
.v3d-ui button:hover { border-color: var(--accent-l); color: var(--accent-l); transform: translateY(-2px); }
.v3d-ui button:active { transform: translateY(1px); }
.v3d-ui button[aria-pressed="true"] { border-color: var(--accent-deep); background: var(--accent-deep); color: #fff; }
.v3d-ui button:focus-visible { outline: 2px solid var(--accent-l); outline-offset: 2px; }
.v3d-ui svg { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.v3d-ui .sw { stroke: none; }
.v3d-ui b { font-weight: 700; }

.v3d-hint {
  position: absolute; left: 50%; bottom: 80px; transform: translateX(-50%); margin: 0; z-index: 3; pointer-events: none; white-space: nowrap;
  font-family: var(--mono); font-size: .75rem; letter-spacing: .04em; color: var(--muted); background: var(--bg);
  border: 1px solid var(--border); border-radius: 20px; padding: .35rem .8rem; opacity: 0;
}
.v3d-on .v3d-hint { animation: hint 8s var(--ease) 3.2s both; }
.v3d-on .v3d-hint.gone { animation: none; opacity: 0; transition: opacity .3s; }
@keyframes hint { 0% { opacity: 0; } 8%, 85% { opacity: 1; } 100% { opacity: 0; } }

/* Übrige Sektionen: Messinstrumente glühen, Konzeptstudien mit Tiefe */
.v3d .dial i { box-shadow: 0 0 6px rgba(232,112,31,.9), 0 0 18px rgba(232,112,31,.45); }
.v3d .dial::after { box-shadow: 0 0 12px 3px rgba(232,112,31,.65); }
.v3d .bench { background: radial-gradient(ellipse 60% 140% at 50% 0%, rgba(201,89,10,.09), transparent 60%), var(--surface); }
.v3d .study { will-change: transform; transform-origin: 50% 50%; }

/* ── Gestapelt (Tablet + Handy): Titel, darunter der Wagen, darunter der Text ── */
@media (max-width: 980px) {
  .v3d .hero-top { padding-top: 22px; grid-template-columns: minmax(0, 1fr); padding-bottom: 40px; }
  .v3d .h1 { font-size: clamp(2.2rem, 6.4vw, 3.6rem); max-width: 11em; padding-right: 50px; }
  .v3d .hero-side { margin-top: calc(min(92vw, 720px) * .47); }
  .v3d .car-in { top: var(--carTop); left: 50%; width: min(92%, 720px); margin-left: calc(min(92%, 720px) / -2); }
  .v3d .parts-h { justify-content: flex-end; padding-bottom: 96px; min-height: 80svh; }
  .v3d .sl li { align-items: flex-end; padding-bottom: 84px; min-height: 92svh; }
  .v3d .sl button { width: 100%; max-width: 32rem; }
  .v3d .titleblock { display: none; }
  .v3d-hint { display: none; }
  .v3d-ui { top: 12px; bottom: auto; right: 12px; flex-direction: column; flex-wrap: nowrap; }
  .v3d-ui button { width: 44px; height: 44px; padding: 0; justify-content: center; }
  .v3d-ui button > span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  .v3d .stamp { position: absolute; display: block; bottom: 36svh; left: var(--gut); margin: 0; }
}
@media (max-width: 640px) {
  .v3d .hero-top { padding-top: 18px; }
  .v3d .sl span { font-size: 1.3rem; }
  .v3d .sl em { font-size: 1rem; }
}

/* Bildnachweis 3D-Modell (CC BY 4.0) */
.ft-credit { margin: .9rem 0 0; color: var(--muted); font-size: .85rem; }
.ft-credit a { color: var(--text); text-underline-offset: 2px; display: inline-block; padding: .55rem 0; }
.ft-credit a:hover { color: var(--accent-l); }

/* Handy: Bedienknöpfe weichen aus, solange Text darüber läuft */
.v3d-on .v3d-ui.cover { opacity: 0; transform: translateX(14px); pointer-events: none; transition: opacity .25s, transform .3s var(--ease); }