/* ============================================
   VELNU — Section Styles
   ============================================ */

/* Shared Door Component */
.door {
  position: relative;
  perspective: 1200px;
  width: 100%;
  height: 100%;
}

.door__frame {
  position: absolute;
  inset: -12px;
  border: 2px solid rgba(181, 157, 106, 0.4);
  box-shadow: inset 0 0 30px rgba(181, 157, 106, 0.08), var(--glow-door);
}

.door__frame--grand {
  inset: -20px;
  border-width: 3px;
}

.door__panel {
  position: absolute;
  top: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(135deg, var(--obsidian) 0%, #1a1d26 50%, var(--velvet-indigo) 100%);
  border: 1px solid rgba(181, 157, 106, 0.2);
  transform-origin: left center;
  transition: transform var(--transition-door);
  backface-visibility: hidden;
}

.door__panel--left {
  left: 0;
  transform-origin: left center;
  border-right: 1px solid rgba(181, 157, 106, 0.15);
}

.door__panel--right {
  right: 0;
  transform-origin: right center;
  border-left: 1px solid rgba(181, 157, 106, 0.15);
}

.door--open .door__panel--left {
  transform: perspective(1200px) rotateY(-75deg);
}

.door--open .door__panel--right {
  transform: perspective(1200px) rotateY(75deg);
}

.door__light-spill {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(244, 246, 248, 0.15) 0%, transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-door);
  pointer-events: none;
}

.door--open .door__light-spill {
  opacity: 1;
}

.door__handle {
  position: absolute;
  right: 18%;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 24px;
  background: linear-gradient(to bottom, var(--brass), var(--dusty-gold));
  border-radius: 2px;
  box-shadow: var(--glow-brass);
}

.door__surface-glow {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(181, 157, 106, 0.08) 0%, transparent 40%, rgba(181, 157, 106, 0.05) 100%);
  pointer-events: none;
}

/* ============================================
   SECTION 1: First Door
   ============================================ */

.section--first-door {
  height: 300vh;
  min-height: 300vh;
}

.first-door__void {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100dvh;
  background: var(--midnight);
  overflow: hidden;
}

.first-door__canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.first-door__approach {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  perspective: 800px;
}

.first-door__approach .door--first {
  width: clamp(80px, 12vw, 140px);
  height: clamp(140px, 22vh, 240px);
  transform: scale(var(--door-scale, 0.35));
  opacity: calc(0.4 + var(--door-proximity, 0) * 0.6);
  transition: opacity 0.1s linear;
  will-change: transform;
}

.section--first-door.door-revealed .first-door__approach .door--first {
  width: clamp(160px, 28vw, 320px);
  height: clamp(280px, 50vh, 520px);
}

.first-door__floor-glow {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 30%;
  background: radial-gradient(ellipse at center bottom, rgba(181, 157, 106, 0.12) 0%, transparent 70%);
  opacity: var(--floor-glow, 0);
  z-index: 1;
  pointer-events: none;
}

/* ============================================
   SECTION 2: Infinite Corridor
   ============================================ */

.section--corridor {
  background: linear-gradient(180deg, var(--midnight) 0%, var(--obsidian) 30%, var(--midnight) 100%);
  padding-bottom: 4rem;
}

.corridor__perspective {
  position: relative;
  display: flex;
  justify-content: space-between;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1rem;
  min-height: 70vh;
  perspective: 600px;
}

.corridor__vanishing {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, transparent, rgba(181, 157, 106, 0.3), transparent);
  opacity: 0.4;
}

.door-wall {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  width: 42%;
  padding: 2rem 0;
}

.door-wall--left {
  align-items: flex-end;
}

.door-wall--right {
  align-items: flex-start;
}

.corridor-door {
  position: relative;
  width: clamp(60px, 8vw, 100px);
  height: clamp(100px, 14vw, 160px);
  cursor: pointer;
  transition: transform 0.4s, filter 0.4s;
  transform: scale(calc(0.7 + var(--depth, 0.5) * 0.3));
  opacity: calc(0.5 + var(--depth, 0.5) * 0.5);
}

.corridor-door:hover,
.corridor-door:focus-visible {
  transform: scale(calc(0.75 + var(--depth, 0.5) * 0.35)) translateY(-4px);
  filter: brightness(1.2);
  outline: none;
}

.corridor-door__frame {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(181, 157, 106, calc(0.2 + var(--depth, 0.5) * 0.3));
}

.corridor-door__panel {
  position: absolute;
  inset: 4px;
  background: var(--door-bg, var(--obsidian));
  border: 1px solid rgba(215, 221, 232, 0.08);
}

.corridor-door__glow {
  position: absolute;
  inset: -4px;
  opacity: 0;
  transition: opacity 0.4s;
  background: radial-gradient(circle, rgba(181, 157, 106, 0.2), transparent 70%);
}

.corridor-door:hover .corridor-door__glow {
  opacity: 1;
}

.corridor-door[data-type="stone"] .corridor-door__panel {
  background: linear-gradient(145deg, #2a2a2e, #1a1a1e);
}

.corridor-door[data-type="glass"] .corridor-door__panel {
  background: linear-gradient(145deg, rgba(215, 221, 232, 0.15), rgba(26, 58, 92, 0.3));
  backdrop-filter: blur(2px);
}

.corridor-door[data-type="celestial"] .corridor-door__panel {
  background: radial-gradient(circle at 30% 30%, #1a3a5c, #0a0c10);
  box-shadow: inset 0 0 20px rgba(100, 150, 255, 0.2);
}

.corridor-door[data-type="mechanical"] .corridor-door__panel {
  background: repeating-linear-gradient(0deg, #1a1d26, #1a1d26 4px, #14161c 4px, #14161c 8px);
}

.corridor-door[data-type="living"] .corridor-door__panel {
  background: linear-gradient(145deg, #1a2a1a, #0f1a0f);
  border-color: rgba(100, 140, 80, 0.2);
}

.corridor-door[data-type="floating"] {
  animation: float-door 6s ease-in-out infinite;
}

/* ============================================
   SECTION 3: Memory Doors
   ============================================ */

.section--memory {
  background: var(--midnight);
  padding-bottom: 4rem;
}

.memory__gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  position: relative;
  z-index: 2;
}

.memory-door {
  position: relative;
  aspect-ratio: 3/5;
  cursor: pointer;
  transition: transform 0.5s;
}

.memory-door:hover,
.memory-door:focus-visible {
  transform: translateY(-8px);
  outline: none;
}

.memory-door__frame {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(181, 157, 106, 0.25);
  background: var(--obsidian);
  overflow: hidden;
}

.memory-door__scene {
  position: absolute;
  inset: 4px;
  opacity: 0.6;
  transition: opacity 0.5s;
}

.memory-door:hover .memory-door__scene,
.memory-door.open .memory-door__scene {
  opacity: 1;
}

.memory-door__light {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 100%, rgba(181, 157, 106, 0.3), transparent 60%);
  opacity: 0;
  transition: opacity 0.6s;
}

.memory-door.open .memory-door__light {
  opacity: 1;
}

.memory-door__label {
  position: absolute;
  bottom: -1.5rem;
  left: 0;
  right: 0;
  text-align: center;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-style: italic;
  color: rgba(215, 221, 232, 0.6);
  letter-spacing: 0.05em;
}

/* ============================================
   SECTION 4: Impossible Architecture
   ============================================ */

.section--impossible {
  background: radial-gradient(ellipse at 50% 50%, var(--velvet-indigo) 0%, var(--midnight) 70%);
  min-height: 120vh;
}

.impossible__chamber {
  position: relative;
  height: 80vh;
  max-width: 1200px;
  margin: 0 auto;
  z-index: 2;
}

/* ============================================
   SECTION 5: Garden of Secret Gates
   ============================================ */

.section--garden {
  background: linear-gradient(180deg, var(--midnight) 0%, #0f1410 50%, var(--midnight) 100%);
  padding-bottom: 4rem;
}

.garden__scene {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 2.5rem;
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  position: relative;
  z-index: 2;
}

.garden-gate {
  position: relative;
  aspect-ratio: 2/3;
  cursor: pointer;
}

.garden-gate__foliage {
  position: absolute;
  bottom: 0;
  left: -10%;
  right: -10%;
  height: 40%;
  background: radial-gradient(ellipse, rgba(30, 50, 30, 0.8), transparent 70%);
  border-radius: 50% 50% 0 0;
}

.garden-gate__door {
  position: absolute;
  bottom: 15%;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 55%;
  border: 1px solid rgba(181, 157, 106, 0.3);
  background: linear-gradient(180deg, rgba(20, 22, 28, 0.9), rgba(15, 20, 16, 0.95));
  transition: box-shadow 0.5s, transform 0.5s;
}

.garden-gate:hover .garden-gate__door,
.garden-gate:focus-visible .garden-gate__door {
  box-shadow: 0 0 30px rgba(181, 157, 106, 0.2);
  transform: translateX(-50%) scale(1.03);
  outline: none;
}

.garden-gate[data-bloom="true"] .garden-gate__door::before {
  content: '';
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 30%;
  background: radial-gradient(circle, rgba(181, 157, 106, 0.3), transparent 70%);
  border-radius: 50%;
  animation: bloom-pulse 3s ease-in-out infinite;
}

.garden-gate[data-water="true"]::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 20%;
  background: linear-gradient(180deg, transparent, rgba(26, 58, 92, 0.3));
}

/* ============================================
   SECTION 6: Clockwork Portals
   ============================================ */

.section--clockwork {
  background: linear-gradient(180deg, var(--obsidian) 0%, #12141a 50%, var(--midnight) 100%);
  min-height: 110vh;
}

.clockwork__hall {
  position: relative;
  height: 70vh;
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.clockwork__gear {
  position: absolute;
  border-radius: 50%;
  border: 3px dashed rgba(181, 157, 106, 0.3);
  animation: gear-spin linear infinite;
}

.clockwork__gear--large {
  width: clamp(200px, 40vw, 400px);
  height: clamp(200px, 40vw, 400px);
  animation-duration: 30s;
}

.clockwork__gear--medium {
  width: clamp(100px, 20vw, 180px);
  height: clamp(100px, 20vw, 180px);
  top: 10%;
  right: 10%;
  animation-duration: 15s;
  animation-direction: reverse;
}

.clockwork__portal-door {
  position: relative;
  width: clamp(120px, 20vw, 200px);
  height: clamp(120px, 20vw, 200px);
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid rgba(181, 157, 106, 0.4);
  animation: portal-rotate 20s linear infinite;
}

.clockwork__door-slice {
  position: absolute;
  width: 50%;
  height: 50%;
  background: var(--obsidian);
  border: 1px solid rgba(181, 157, 106, 0.15);
}

.clockwork__door-slice:nth-child(1) { top: 0; left: 0; }
.clockwork__door-slice:nth-child(2) { top: 0; right: 0; }
.clockwork__door-slice:nth-child(3) { bottom: 0; left: 0; }
.clockwork__door-slice:nth-child(4) { bottom: 0; right: 0; }

/* ============================================
   SECTION 7: Library of Keys
   ============================================ */

.section--library {
  background: linear-gradient(180deg, var(--midnight) 0%, #0e0c0a 40%, var(--obsidian) 100%);
  padding-bottom: 4rem;
}

.library__shelves {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 1rem;
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  position: relative;
  z-index: 2;
}

.library-key {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0.5rem;
  cursor: pointer;
  transition: transform 0.3s;
}

.library-key:hover,
.library-key:focus-visible {
  transform: translateY(-4px) rotate(-5deg);
  outline: none;
}

.library-key__icon {
  width: 32px;
  height: 32px;
  position: relative;
}

.library-key__icon::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 14px;
  height: 14px;
  border: 2px solid var(--key-color, var(--brass));
  border-radius: 50%;
  border-right-color: transparent;
  border-bottom-color: transparent;
  transform: translateX(-50%) rotate(-45deg);
}

.library-key__icon::after {
  content: '';
  position: absolute;
  top: 10px;
  left: 50%;
  width: 2px;
  height: 18px;
  background: var(--key-color, var(--brass));
  transform: translateX(-50%);
  box-shadow: 4px 12px 0 -1px var(--key-color, var(--brass));
}

.library-key__name {
  font-family: var(--font-heading);
  font-size: 0.6875rem;
  font-style: italic;
  color: rgba(215, 221, 232, 0.5);
  text-align: center;
}

.library-key[data-type="golden"] { --key-color: #d4af37; }
.library-key[data-type="crystal"] { --key-color: #a8d8ea; }
.library-key[data-type="ancient"] { --key-color: #8b7355; }
.library-key[data-type="floating"] { animation: float-key 4s ease-in-out infinite; }

/* ============================================
   SECTION 8: Celestial Threshold
   ============================================ */

.section--celestial {
  background: var(--midnight);
  min-height: 120vh;
}

.celestial__webgl {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.celestial__portals {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  position: relative;
  z-index: 2;
}

.celestial-portal {
  width: clamp(100px, 15vw, 160px);
  height: clamp(140px, 20vw, 220px);
  position: relative;
  cursor: pointer;
  transition: transform 0.5s;
}

.celestial-portal:hover,
.celestial-portal:focus-visible {
  transform: scale(1.05);
  outline: none;
}

.celestial-portal__frame {
  position: absolute;
  inset: 0;
  border: 2px solid rgba(181, 157, 106, 0.3);
  overflow: hidden;
}

.celestial-portal__nebula {
  position: absolute;
  inset: 4px;
  border-radius: 2px;
}

/* ============================================
   SECTION 9: Mirror Maze
   ============================================ */

.section--mirror {
  background: linear-gradient(135deg, var(--obsidian) 0%, var(--velvet-indigo) 50%, var(--midnight) 100%);
  padding-bottom: 4rem;
}

.mirror__labyrinth {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  position: relative;
  z-index: 2;
}

@media (max-width: 640px) {
  .mirror__labyrinth {
    grid-template-columns: repeat(2, 1fr);
  }
}

.mirror-door {
  aspect-ratio: 3/4;
  position: relative;
  cursor: pointer;
  transition: transform 0.4s;
}

.mirror-door:hover,
.mirror-door:focus-visible {
  transform: scale(1.02);
  outline: none;
}

.mirror-door__surface {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(215, 221, 232, 0.2);
  background: linear-gradient(135deg, rgba(215, 221, 232, 0.08), rgba(42, 45, 74, 0.4));
  overflow: hidden;
}

.mirror-door__reflection {
  position: absolute;
  inset: 0;
  opacity: 0.5;
  transition: opacity 0.4s, transform 0.6s;
}

.mirror-door:hover .mirror-door__reflection {
  opacity: 0.8;
  transform: scale(1.05) rotate(1deg);
}

.mirror-door__label {
  position: absolute;
  bottom: 0.5rem;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.625rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(215, 221, 232, 0.4);
}

/* ============================================
   SECTION 10: Final Threshold
   ============================================ */

.section--final {
  background: var(--midnight);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.final__doorway {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem;
}

.final__doorway .door--final {
  width: clamp(200px, 40vw, 420px);
  height: clamp(340px, 65vh, 680px);
  margin: 0 auto 3rem;
}

.final__content {
  position: relative;
  z-index: 3;
}

.final__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 3rem);
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--moonstone);
  margin-bottom: 2.5rem;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1s, transform 1s;
}

.section--final.visible .final__title {
  opacity: 1;
  transform: translateY(0);
}

.final__handle-btn {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  padding: 1rem 2rem;
  transition: transform 0.5s;
}

.final__handle-btn:hover,
.final__handle-btn:focus-visible {
  transform: scale(1.03);
  outline: none;
}

.final__handle {
  display: block;
  width: clamp(80px, 15vw, 140px);
  height: clamp(16px, 3vw, 24px);
  background: linear-gradient(to bottom, var(--brass), var(--dusty-gold));
  border-radius: 8px;
  box-shadow: var(--glow-brass);
  transition: box-shadow 0.6s, transform 0.6s;
}

.final__handle-btn:hover .final__handle,
.final__handle-btn:focus-visible .final__handle {
  box-shadow: 0 0 60px rgba(181, 157, 106, 0.5);
  transform: rotate(-8deg);
}

.door--final.door--unlocking .door__panel--left {
  transform: perspective(1200px) rotateY(-15deg);
}

.door--final.door--unlocking .door__panel--right {
  transform: perspective(1200px) rotateY(15deg);
}

.door--final.door--open .door__panel--left {
  transform: perspective(1200px) rotateY(-85deg);
}

.door--final.door--open .door__panel--right {
  transform: perspective(1200px) rotateY(85deg);
}

.final__btn-text {
  font-family: var(--font-display);
  font-size: clamp(0.875rem, 2vw, 1.125rem);
  letter-spacing: 0.25em;
  color: var(--brass);
  transition: color 0.4s, letter-spacing 0.4s;
}

.final__handle-btn:hover .final__btn-text {
  color: var(--moonstone);
  letter-spacing: 0.3em;
}

.final__canvas {
  position: absolute;
  inset: 0;
  z-index: 1;
}