/* ============================================
   ZEITREISE – Decade-Specific Styles
   ============================================ */

/* ---- Shared Decade Layout ---- */
.decade {
  position: relative;
  min-height: 100vh;
}

.decade__pin {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.decade__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.decade__content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: var(--section-padding) var(--space-lg);
  text-align: center;
}

.decade__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  padding: 0.4rem 1rem;
  border: 1px solid currentColor;
  border-radius: 2px;
  margin-bottom: var(--space-lg);
  opacity: 0.8;
}

.decade__year {
  font-family: var(--font-display);
  font-size: clamp(5rem, 15vw, 12rem);
  line-height: 0.9;
  margin-bottom: var(--space-lg);
  will-change: transform, opacity;
}

.decade__teaser {
  font-family: var(--decade-font-accent);
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  line-height: 1.5;
  margin-bottom: var(--space-xl);
  opacity: 0.9;
}

.decade__songs {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  text-align: left;
  max-width: 400px;
  margin: 0 auto;
}

.decade__songs li {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
  font-size: 0.95rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.4s, transform 0.4s;
}

/* Journey panels: songs visible when active */
.journey-panel.is-active .decade__songs li {
  opacity: 1;
  transform: translateY(0);
}

.song-artist {
  font-weight: 600;
  min-width: 120px;
}

/* ============================================
   1970er – Warm, earthy, vintage
   ============================================ */
.decade--70s {
  --decade-bg: #1a1208;
  --decade-text: #f5e6c8;
  --decade-accent: #d4a056;
  --decade-font-accent: 'Righteous', cursive;
  background: var(--decade-bg);
  color: var(--decade-text);
}

.decade--70s .decade__year {
  color: var(--decade-accent);
  text-shadow: 0 0 60px rgba(212, 160, 86, 0.3);
}

.decade--70s .decade__badge {
  color: var(--decade-accent);
  border-color: var(--decade-accent);
}

.decade--70s .song-artist {
  color: var(--decade-accent);
}

/* Film grain overlay */
.decade--70s .decade__grain {
  position: absolute;
  inset: 0;
  opacity: 0.15;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 128px 128px;
  pointer-events: none;
}

/* Vinyl disc */
.decade--70s .decade__vinyl {
  position: absolute;
  right: -5%;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0.15;
}

.vinyl-disc {
  width: clamp(250px, 40vw, 500px);
  height: clamp(250px, 40vw, 500px);
  border-radius: 50%;
  background:
    radial-gradient(circle at center, #1a1208 15%, transparent 16%),
    repeating-radial-gradient(circle at center, #2a1f0f 0px, #1a1208 2px, #2a1f0f 4px);
  border: 3px solid rgba(212, 160, 86, 0.3);
  animation: vinyl-spin 20s linear infinite;
}

@keyframes vinyl-spin {
  to { transform: rotate(360deg); }
}

.decade--70s .decade__bg {
  background:
    radial-gradient(ellipse at 30% 50%, rgba(212, 160, 86, 0.15) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(139, 90, 43, 0.2) 0%, transparent 50%),
    var(--decade-bg);
}

/* ============================================
   1980er – Neon, Synthwave
   ============================================ */
.decade--80s {
  --decade-bg: #0a0015;
  --decade-text: #e0e0ff;
  --decade-accent: #ff006e;
  --decade-font-accent: 'Press Start 2P', cursive;
  background: var(--decade-bg);
  color: var(--decade-text);
}

.decade--80s .decade__year {
  color: transparent;
  background: linear-gradient(180deg, #ff006e, #8338ec, #3a86ff);
  -webkit-background-clip: text;
  background-clip: text;
  filter: drop-shadow(0 0 30px rgba(255, 0, 110, 0.5));
}

.decade--80s .decade__badge {
  color: #3a86ff;
  border-color: #3a86ff;
  text-shadow: 0 0 10px rgba(58, 134, 255, 0.5);
}

.decade--80s .decade__teaser {
  font-size: clamp(0.8rem, 2vw, 1rem);
  line-height: 2;
}

.decade--80s .song-artist {
  color: #ff006e;
  text-shadow: 0 0 8px rgba(255, 0, 110, 0.4);
}

/* Synthwave grid horizon */
.decade--80s .decade__grid-horizon {
  position: absolute;
  bottom: 0;
  left: -50%;
  right: -50%;
  height: 50%;
  background:
    linear-gradient(to bottom, transparent 0%, rgba(58, 134, 255, 0.1) 100%),
    repeating-linear-gradient(90deg, transparent, transparent 49px, rgba(255, 0, 110, 0.15) 49px, rgba(255, 0, 110, 0.15) 50px),
    repeating-linear-gradient(0deg, transparent, transparent 49px, rgba(58, 134, 255, 0.15) 49px, rgba(58, 134, 255, 0.15) 50px);
  transform: perspective(500px) rotateX(60deg);
  transform-origin: center bottom;
  opacity: 0.6;
}

.decade--80s .decade__neon-lines {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(255, 0, 110, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 100%, rgba(58, 134, 255, 0.15) 0%, transparent 40%),
    radial-gradient(ellipse at 80% 100%, rgba(131, 56, 236, 0.15) 0%, transparent 40%);
}

.decade--80s .decade__bg {
  background: var(--decade-bg);
}

/* ============================================
   1990er – Grunge, VHS, Polaroid
   ============================================ */
.decade--90s {
  --decade-bg: #1a1a1a;
  --decade-text: #e8e0d0;
  --decade-accent: #cc3333;
  --decade-font-accent: 'Permanent Marker', cursive;
  background: var(--decade-bg);
  color: var(--decade-text);
}

.decade--90s .decade__year {
  color: var(--decade-text);
  text-shadow: 3px 3px 0 var(--decade-accent);
  transform: rotate(-2deg);
}

.decade--90s .decade__badge {
  color: var(--decade-accent);
  border-color: var(--decade-accent);
  transform: rotate(1deg);
}

.decade--90s .song-artist {
  color: var(--decade-accent);
}

/* VHS scanlines */
.decade--90s .decade__scanlines {
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.15) 2px,
    rgba(0, 0, 0, 0.15) 4px
  );
  pointer-events: none;
  opacity: 0.5;
}

/* Polaroid collage */
.decade--90s .decade__polaroids {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.decade--90s .polaroid {
  position: absolute;
  width: 120px;
  height: 140px;
  background: #f5f0e0;
  box-shadow: 2px 4px 12px rgba(0, 0, 0, 0.4);
  opacity: 0.12;
}

.decade--90s .polaroid:nth-child(1) {
  top: 15%;
  left: 10%;
  transform: rotate(-8deg);
}

.decade--90s .polaroid:nth-child(2) {
  top: 60%;
  right: 12%;
  transform: rotate(5deg);
  width: 100px;
  height: 120px;
}

.decade--90s .polaroid:nth-child(3) {
  bottom: 20%;
  left: 20%;
  transform: rotate(12deg);
  width: 90px;
  height: 110px;
}

.decade--90s .decade__bg {
  background:
    radial-gradient(circle at 80% 20%, rgba(204, 51, 51, 0.1) 0%, transparent 40%),
    var(--decade-bg);
}

/* ============================================
   2000er/2010er – Digital, gradients, glitch
   ============================================ */
.decade--00s {
  --decade-bg: #0d0d1a;
  --decade-text: #ffffff;
  --decade-accent: #7b68ee;
  --decade-font-accent: 'Space Grotesk', sans-serif;
  background: var(--decade-bg);
  color: var(--decade-text);
}

.decade--00s .decade__year {
  background: linear-gradient(135deg, #667eea, #764ba2, #f093fb);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.decade--00s .decade__badge {
  color: #667eea;
  border-color: #667eea;
}

.decade--00s .song-artist {
  color: #a78bfa;
}

.decade--00s .decade__gradient-mesh {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(102, 126, 234, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(118, 75, 162, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(240, 147, 251, 0.1) 0%, transparent 50%);
}

.decade--00s .decade__glitch-overlay {
  position: absolute;
  inset: 0;
  opacity: 0;
  background: linear-gradient(90deg,
    transparent 0%,
    rgba(102, 126, 234, 0.03) 25%,
    transparent 50%,
    rgba(240, 147, 251, 0.03) 75%,
    transparent 100%
  );
  background-size: 200% 100%;
  animation: glitch-slide 4s linear infinite;
  pointer-events: none;
}

@keyframes glitch-slide {
  0% { background-position: 200% 0; opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { background-position: -200% 0; opacity: 0; }
}

/* ============================================
   Heute – Clean, sharp, present
   ============================================ */
.decade--today {
  --decade-bg: #0a0a12;
  --decade-text: #ffffff;
  --decade-accent: var(--brand-primary);
  --decade-font-accent: 'Inter', sans-serif;
  background: var(--decade-bg);
  color: var(--decade-text);
}

.decade--today .decade__year {
  color: white;
  text-shadow: none;
  filter: none;
}

.decade--today .decade__badge {
  color: var(--brand-primary);
  border-color: var(--brand-primary);
  background: rgba(230, 57, 70, 0.1);
}

.decade--today .song-artist {
  color: var(--brand-primary);
}

.decade--today .decade__present-glow {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 50% 50%, rgba(230, 57, 70, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 30% 70%, rgba(42, 157, 143, 0.06) 0%, transparent 50%);
}

.decade--today .decade__content {
  filter: none;
}

/* Decade transition morph overlay */
.decades::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.5s;
}