/* =====================================================================
   morovd.de · Echo — 3D-Zylinder-Karussell ("Klangfelder")
   ---------------------------------------------------------------------
   8 Songs als drehbares 3D-Karussell auf Basis des Landing-Gitters.
   Drei Lamellen sichtbar; die mittlere steht frontal, groß und mit
   erwärmtem Messing-Rahmen ("die Gitterzelle selbst wird zum Klangfeld").
   Beim Scrollen dreht der Zylinder nach links — der nächste Song schwenkt
   in die Mitte, wächst und blendet seinen Inhalt auf.

   Mechanik:
   - .ek-wrap = hoher Scroll-Track; .ek-stage bleibt sticky (100svh).
   - .ek-scene trägt die Perspektive; .ek-ring dreht (rotateY via --rot).
   - .ek-panel sitzen auf einem Zylinder (rotateY(i*step) translateZ(R)).
   - echo-carousel.js setzt --rot am Ring und pro Lamelle --focus/--reveal
     + opacity/visibility (Fokus = Nähe zur Mitte).

   Guardrails: nur transform/opacity animiert; Custom-Props pro Lamelle
   (nicht auf der Bühne); reduced-motion / kein-3D -> flacher Crossfade;
   ohne JS (html:not(.ek-js)) -> lesbare, gestapelte Liste.
   ===================================================================== */

/* ---- Stellschrauben ------------------------------------------------ */
.ek-page {
  --ek-step: 42deg;                 /* Winkelabstand zweier Lamellen     */
  --ek-persp: 1180px;               /* Kamera-Tiefe (kleiner = dramatischer) */
  --pw: clamp(236px, 25vw, 352px);  /* Kartenbreite                      */
  --ph: clamp(300px, 45vh, 432px);  /* Kartenhöhe (Portrait)             */
  --ek-radius: calc(var(--pw) * 1.46); /* Zylinderradius (Lamellen fächern) */
  --ek-track: calc(100svh * 9);     /* Scroll-Länge: (N+1)*100svh, N=8   */
  --ek-cell: 34px;                  /* Maschenweite des Innengitters     */

  --c-cool: 150, 182, 174;          /* kühle Patina (Gitter idle)        */
  --c-brassrgb: 199, 167, 101;      /* Messing (erwärmter Rahmen)        */

  background: var(--c-petrol-deep);
  min-height: 100svh;
}

/* ---- Scroll-Behälter + sticky Bühne -------------------------------- */
.ek-wrap {
  position: relative;
  height: var(--ek-track);
}

.ek-stage {
  position: sticky;
  top: 0;
  width: 100%;
  height: 100vh;
  height: 100svh;
  overflow: hidden;
  background: var(--c-black);
}

/* Hintergrundbild: dezent abgedunkelt/entsättigt, aber noch gut sichtbar */
.ek-stage__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 42%;
  z-index: 0;
  filter: brightness(0.62) saturate(0.85) contrast(1.02);
  user-select: none;
}
@media (prefers-reduced-motion: no-preference) {
  .ek-stage__img { animation: ek-ken-burns 22s cubic-bezier(0.22, 0.61, 0.36, 1) infinite alternate; }
}
@keyframes ek-ken-burns {
  from { transform: scale(1.08); }
  to   { transform: scale(1.00); }
}

/* Cursor-Nebel-Canvas (hero-fog-cursor.js) */
.ek-stage__fog {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

/* Vignette: oberes Dunkel (Header), seitliche + untere Tiefe in Petrol */
.ek-stage__vignette {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background:
    radial-gradient(120% 90% at 50% 46%,
      rgba(6, 15, 14, 0) 38%,
      rgba(6, 15, 14, 0.35) 78%,
      rgba(6, 15, 14, 0.7) 100%),
    linear-gradient(to bottom,
      rgba(6, 15, 14, 0.6) 0%,
      rgba(6, 15, 14, 0) 16%,
      rgba(6, 15, 14, 0) 70%,
      rgba(13, 36, 48, 0.72) 90%,
      var(--c-petrol-deep) 100%);
}

/* ---- 3D-Szene ------------------------------------------------------ */
.ek-scene {
  position: absolute;
  inset: 0;
  z-index: 3;
  -webkit-perspective: var(--ek-persp);
          perspective: var(--ek-persp);
  -webkit-perspective-origin: 50% 47%;
          perspective-origin: 50% 47%;
}

.ek-ring {
  position: absolute;
  inset: 0;
  -webkit-transform-style: preserve-3d;
          transform-style: preserve-3d;
  /* Ring um R nach hinten schieben, dann drehen -> Frontkarte landet auf z=0 */
  -webkit-transform: translateZ(calc(var(--ek-radius) * -1)) rotateY(var(--rot, 0deg));
          transform: translateZ(calc(var(--ek-radius) * -1)) rotateY(var(--rot, 0deg));
  will-change: transform;
}

/* ---- Lamelle = Klangfeld-Zelle ------------------------------------- */
.ek-panel {
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--pw);
  height: var(--ph);
  margin: 0;
  /* zentrieren, dann auf den Zylinder setzen */
  -webkit-transform:
    translate(-50%, -50%)
    rotateY(calc(var(--i) * var(--ek-step)))
    translateZ(var(--ek-radius));
          transform:
    translate(-50%, -50%)
    rotateY(calc(var(--i) * var(--ek-step)))
    translateZ(var(--ek-radius));
  -webkit-backface-visibility: hidden;
          backface-visibility: hidden;
  opacity: 0;                     /* JS hebt sichtbare Lamellen an */
  --focus: 0;                     /* 1 = mittig, 0 = Nachbar/fern */
  --reveal: 0;                    /* Gedicht + Link nahe der Mitte */
  will-change: opacity;
}

.ek-panel__inner {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: row;
  align-items: stretch;
  gap: clamp(12px, 1.3vw, 20px);
  padding: clamp(16px, 1.6vw, 22px) clamp(16px, 1.5vw, 20px);
  overflow: hidden;
  /* Petrol-Glas + feines Innengitter (die Maschen des Landing-Rasters) */
  background-color: rgba(6, 15, 14, 0.6);
  background-image:
    repeating-linear-gradient(to right,
      transparent 0 calc(var(--ek-cell) - 1px),
      rgba(var(--c-cool), 0.10) calc(var(--ek-cell) - 1px) var(--ek-cell)),
    repeating-linear-gradient(to bottom,
      transparent 0 calc(var(--ek-cell) - 1px),
      rgba(var(--c-cool), 0.10) calc(var(--ek-cell) - 1px) var(--ek-cell));
  -webkit-backdrop-filter: blur(2px);
          backdrop-filter: blur(2px);
  box-shadow: 0 24px 60px -28px rgba(0, 0, 0, 0.8);
}

/* Zellrahmen: kühl im Default, erwärmt + glimmt zur Mitte (per --focus) */
.ek-panel__frame {
  position: absolute;
  inset: 0;
  pointer-events: none;
  /* kühle Grundlinie immer da */
  border: 1px solid rgba(var(--c-cool), 0.28);
}
.ek-panel__frame::after {
  content: "";
  position: absolute;
  inset: -1px;
  border: 1px solid rgba(var(--c-brassrgb), 0.92);
  box-shadow:
    0 0 0 1px rgba(var(--c-brassrgb), 0.18),
    0 0 22px rgba(var(--c-brassrgb), 0.42),
    inset 0 0 26px rgba(var(--c-brassrgb), 0.12);
  opacity: var(--focus);         /* glimmt auf, je näher zur Mitte */
}

/* ---- Buchrücken: Songname vertikal (Megrim) an der Messing-Naht ----- */
.ek-panel__spine {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-left: clamp(2px, 0.4vw, 6px);
}

.ek-panel__title {
  margin: 0;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  max-height: 100%;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(25px, 2.7vw, 40px);
  letter-spacing: 0.10em;
  line-height: 1.08;
  color: var(--c-champagne);
  text-shadow: 0 1px 18px rgba(6, 15, 14, 0.6);
}

/* ---- Body rechts: Nummer, Thema, Gedicht, YouTube ------------------ */
.ek-panel__body {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.ek-panel__num {
  font-family: var(--font-text);
  font-weight: 400;
  font-size: clamp(10px, 0.85vw, 12px);
  letter-spacing: 0.3em;
  color: var(--c-brass);
  line-height: 1;
  margin-bottom: clamp(8px, 1.1vh, 13px);
}

.ek-panel__theme {
  display: block;
  font-family: var(--font-text);
  font-weight: 400;
  font-size: clamp(9px, 0.8vw, 10.5px);
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--c-patina);
  margin-bottom: clamp(10px, 1.5vh, 16px);
  opacity: var(--focus);         /* nur die aktive Karte zeigt das Thema */
}

.ek-panel__poem {
  margin: 0;
  font-family: var(--font-text);
  font-weight: 400;
  font-size: clamp(12px, 1vw, 14px);
  line-height: 1.85;
  color: var(--c-sand);
  opacity: var(--reveal);        /* erscheint nahe der Mitte */
}

.ek-panel__yt {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: clamp(12px, 1.6vh, 18px);
  align-self: flex-start;
  text-decoration: none;
  opacity: var(--reveal);
  pointer-events: none;          /* JS schaltet auf auto wenn sichtbar */
  cursor: pointer;
}
.ek-panel__yt:focus-visible { outline: 1px solid var(--c-brass); outline-offset: 3px; }

.ek-panel__yticon {
  width: 22px;
  height: 22px;
  fill: var(--c-brass);
  flex-shrink: 0;
  transition: fill 0.25s ease, transform 0.25s ease;
}
.ek-panel__yt:hover .ek-panel__yticon,
.ek-panel__yt:focus-visible .ek-panel__yticon { fill: #ff3b30; transform: scale(1.06); }

.ek-panel__ytlabel {
  font-family: var(--font-text);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(var(--c-brassrgb), 0.72);
  transition: color 0.25s ease;
}
.ek-panel__yt:hover .ek-panel__ytlabel,
.ek-panel__yt:focus-visible .ek-panel__ytlabel { color: var(--c-champagne); }

/* ---- Deckblatt / Titelseite (Panel 0, vor Song I) ------------------ */
.ek-panel--cover .ek-panel__inner {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: clamp(22px, 3vw, 36px);
}

.ek-cover {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(14px, 2.2vh, 22px);
  opacity: var(--reveal);
}

.ek-cover__sep {
  width: clamp(2rem, 5vw, 3.4rem);
  height: 1px;
  background: linear-gradient(to right, transparent, var(--c-brass), transparent);
  opacity: 0.55;
}

.ek-cover__lead {
  margin: 0;
  font-family: var(--font-text);
  font-weight: 400;
  font-size: clamp(13.5px, 1.15vw, 16.5px);
  line-height: 1.85;
  letter-spacing: 0.01em;
  color: var(--c-creme);
}

.ek-cover__use {
  margin: 0;
  font-family: var(--font-text);
  font-weight: 400;
  font-size: clamp(10.5px, 0.92vw, 12.5px);
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--c-brass);
}

/* ---- Titel-Overlay ------------------------------------------------- */
.ek-stage__title {
  position: absolute;
  z-index: 5;
  pointer-events: none;          /* dekorativ — nie Klicks der Karten abfangen */
  left: clamp(1.5rem, 5vw, 5rem);
  bottom: clamp(3rem, 8vh, 6rem);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.8rem;
  will-change: opacity;
  text-shadow: 0 1px 20px rgba(6, 15, 14, 0.9), 0 1px 4px rgba(6, 15, 14, 0.95);
}

.ek-kicker {
  display: block;
  width: clamp(2rem, 5vw, 3.5rem);
  height: 1px;
  background: var(--c-brass);
  opacity: 0.7;
}

.ek-h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  letter-spacing: 0.22em;
  color: var(--c-creme);
  line-height: 1.05;
}

.ek-sub {
  margin: 0;
  font-family: var(--font-text);
  font-weight: 400;
  font-size: clamp(0.9rem, 1.3vw, 1.15rem);
  letter-spacing: 0.05em;
  color: var(--c-sand);
}

/* ---- Scroll-Cue ---------------------------------------------------- */
.ek-cue {
  position: absolute;
  z-index: 5;
  bottom: clamp(1.2rem, 3vh, 2.2rem);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  text-decoration: none;
  will-change: opacity;
}

.ek-cue__label {
  font-family: var(--font-text);
  font-size: 0.65rem;
  letter-spacing: 0.38em;
  text-transform: uppercase;
  color: var(--c-sand);                 /* hell & warm wie auf der Startseite */
  text-shadow: 0 0 18px rgba(227, 204, 151, 0.45);   /* sanftes Leuchten */
}

.ek-cue__chevron {
  width: 14px;
  height: 8px;
  color: var(--c-brass);
  filter: drop-shadow(0 0 6px rgba(199, 167, 101, 0.55));
  animation: ek-bounce 2s ease-in-out infinite;
}

@keyframes ek-bounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(3px); }
}

/* ---- Mobil --------------------------------------------------------- */
@media (max-width: 640px) {
  .ek-page {
    --ek-step: 50deg;             /* Nachbarn tauchen weiter weg */
    --ek-persp: 720px;
    --pw: min(80vw, 320px);
    --ph: clamp(300px, 56vh, 440px);
    --ek-radius: calc(var(--pw) * 1.3);
    --ek-cell: 30px;
  }
}

/* sehr schmal: Nachbarn ausblenden, reiner Center-Crossfade (JS-Klasse) */
@media (max-width: 430px) {
  .ek-page { --ek-step: 64deg; }
}

/* ---- Fallback A: ohne JS -> lesbare, gestapelte Liste -------------- */
html:not(.ek-js) .ek-wrap { height: auto; }
html:not(.ek-js) .ek-stage {
  position: static;
  height: auto;
  min-height: 100svh;
  overflow: visible;
  padding: clamp(7rem, 14vh, 11rem) 1.25rem clamp(3rem, 8vh, 5rem);
}
html:not(.ek-js) .ek-scene {
  position: static;
  perspective: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem;
}
html:not(.ek-js) .ek-ring {
  position: static;
  inset: auto;
  display: contents;
  transform: none;
}
html:not(.ek-js) .ek-panel {
  position: relative;
  top: auto;
  left: auto;
  transform: none;
  opacity: 1;
  --focus: 1;
  --reveal: 1;
}
html:not(.ek-js) .ek-panel__yt { pointer-events: auto; }

/* ---- Fallback B: reduced-motion / kein 3D -> Center-Crossfade ------ */
/* Karten stapeln deckungsgleich in der Mitte; JS blendet die aktive ein. */
@media (prefers-reduced-motion: reduce) {
  .ek-cue__chevron { animation: none; }

  html.ek-js .ek-scene { perspective: none; }
  html.ek-js .ek-ring { transform: none; }
  html.ek-js .ek-panel {
    transform: translate(-50%, -50%);
    transition: opacity 0.5s ease;
    --reveal: 1;
  }
  html.ek-js .ek-panel .ek-panel__frame::after { opacity: 1; }
}

/* Browser ganz ohne 3D-Unterstützung: ebenfalls flach stapeln. */
@supports not ((-webkit-transform-style: preserve-3d) or (transform-style: preserve-3d)) {
  html.ek-js .ek-scene { perspective: none; }
  html.ek-js .ek-ring { transform: none; }
  html.ek-js .ek-panel { transform: translate(-50%, -50%); --reveal: 1; }
  html.ek-js .ek-panel .ek-panel__frame::after { opacity: 1; }
}