/* ============================
   CSS Variables & Reset
   ============================ */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --font-display: 'Cal Sans', serif;
  --font-body: 'Golos Text', sans-serif;
  --font-mono: 'Golos Text', sans-serif;

  --clr-home-1: #1a0a00;
  --clr-home-2: #3b1a00;
  --clr-ply-1: #0d1a12;
  --clr-ply-2: #1b3a25;
  --clr-lam-1: #0e0d1a;
  --clr-lam-2: #1e1b3a;

  --accent-home: #31302f;
  --accent-ply: #31302f;
  --accent-lam: #31302f;

  --panel-width-default: 33.333%;
  --panel-width-active: 55%;
  --panel-width-inactive: 22.5%;

  --transition-speed: 0.65s;
  --transition-ease: cubic-bezier(0.77, 0, 0.175, 1);
}

html, body {
  height: 100%;
  overflow: hidden;
  cursor: none;
}

/* ============================
   Panels Container
   ============================ */
.panels {
  display: flex;
  width: 100vw;
  height: 100vh;
  position: relative;
}

/* ============================
   Individual Panel
   ============================ */
.panel {
  position: relative;
  width: var(--panel-width-default);
  height: 100%;
  overflow: hidden;
  transition: width var(--transition-speed) var(--transition-ease);
  cursor: none;
}

/* When any panel is hovered, set siblings to inactive width */
.panels:has(.panel:hover) .panel {
  width: var(--panel-width-inactive);
}
.panels:has(.panel:hover) .panel:hover {
  width: var(--panel-width-active);
}

/* ============================
   Panel Backgrounds
   ============================ */
.panel__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transition: transform var(--transition-speed) var(--transition-ease),
              filter var(--transition-speed) var(--transition-ease);
  filter: saturate(0.6) brightness(0.55);
  transform: scale(1.08);
  will-change: transform, filter;
}

.panel:hover .panel__bg {
  transform: scale(1.0);
  filter: saturate(0.9) brightness(0.7);
}

/* Unique bg images via CSS gradients + patterns (no external images needed) */
#panel-home .panel__bg {
  background:
    url("https://images.unsplash.com/photo-1600585154340-be6161a56a0c?w=1400&q=80") center/cover no-repeat;
}

#panel-plywood .panel__bg {
  background:
    url("https://images.unsplash.com/photo-1558618666-fcd25c85cd64?w=1400&q=80") center/cover no-repeat;
}

#panel-laminates .panel__bg {
  background:
    url("https://images.unsplash.com/photo-1556909114-f6e7ad7d3136?w=1400&q=80") center/cover no-repeat;
}

/* ============================
   Gradient Overlay
   ============================ */
.panel__overlay {
  position: absolute;
  inset: 0;
  transition: opacity var(--transition-speed) var(--transition-ease);
}

#panel-home .panel__overlay {
  background: linear-gradient(135deg,
    rgba(26,10,0,0.85) 0%,
    rgba(59,26,0,0.4) 50%,
    rgba(0,0,0,0.6) 100%);
}

#panel-plywood .panel__overlay {
  background: linear-gradient(135deg,
    rgba(13,26,18,0.88) 0%,
    rgba(27,58,37,0.4) 50%,
    rgba(0,0,0,0.6) 100%);
}

#panel-laminates .panel__overlay {
  background: linear-gradient(135deg,
    rgba(14,13,26,0.88) 0%,
    rgba(30,27,58,0.4) 50%,
    rgba(0,0,0,0.6) 100%);
}

/* ============================
   Panel Content
   ============================ */
.panel__content {
  position: absolute;
  bottom: 80px;
  left: 52px;
  z-index: 10;
  max-width: 360px;
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.4s ease calc(var(--transition-speed) * 0.3),
    transform 0.5s var(--transition-ease) calc(var(--transition-speed) * 0.3);
  pointer-events: none;
}

.panel:hover .panel__content {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.panel__eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 300;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 14px;
}

.panel__heading {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 6vw, 6rem);
  line-height: 0.9;
  letter-spacing: 0.02em;
  color: #fff;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.panel__heading em {
  font-family: var(--font-body);
  font-style: italic;
  font-weight: 300;
  font-size: 0.72em;
  letter-spacing: 0.04em;
}

.panel__sub {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 300;
  line-height: 1.6;
  color: rgba(255,255,255,0.65);
  margin-bottom: 32px;
  max-width: 280px;
}

/* CTA Button */
.panel__cta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 14px 32px;
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  transition: border-color 0.3s ease, color 0.3s ease;
}

/* Span wraps the text and sits above the ::before fill */
.panel__cta span {
  position: relative;
  z-index: 1;
}

.panel__cta::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 0;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--transition-ease);
}

.panel__cta:hover {
  color: #1a1a1a;
  border-color: transparent;
}

.panel__cta:hover::before {
  transform: scaleX(1);
}

#panel-home .panel__cta::before    { background: #ffffff; }
#panel-plywood .panel__cta::before { background: #ffffff; }
#panel-laminates .panel__cta::before { background: #ffffff; }

/* ============================
   Vertical Label (resting state)
   ============================ */
.panel__label-vertical {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-90deg);
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 4vw, 5rem);
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.12);
  white-space: nowrap;
  pointer-events: none;
  z-index: 5;
  transition:
    opacity var(--transition-speed) var(--transition-ease),
    letter-spacing var(--transition-speed) var(--transition-ease);
  user-select: none;
}

.panel:hover .panel__label-vertical {
  opacity: 0;
  letter-spacing: 0.5em;
}

/* ============================
   Accent Line (bottom border)
   ============================ */
.panel::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--transition-ease) 0.2s;
}

.panel:hover::after {
  transform: scaleX(1);
}

#panel-home::after    { background: var(--accent-home); }
#panel-plywood::after { background: var(--accent-ply); }
#panel-laminates::after { background: var(--accent-lam); }

/* ============================
   Divider Lines between panels
   ============================ */
.panel:not(:last-child)::before {
  content: '';
  position: absolute;
  right: 0;
  top: 10%;
  height: 80%;
  width: 1px;
  background: rgba(255,255,255,0.08);
  z-index: 20;
  transition: opacity var(--transition-speed) ease;
}

/* ============================
   Custom Cursor
   ============================ */
.cursor-glow {
  position: fixed;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.7);
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: transform 0.08s ease, width 0.25s ease, height 0.25s ease, background 0.25s ease, border-color 0.25s ease;
  mix-blend-mode: difference;
}

/* ============================
   Noise Texture Overlay
   ============================ */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  opacity: 0.04;
  pointer-events: none;
  z-index: 100;
}

/* ============================
   Responsive (basic mobile fallback)
   ============================ */
@media (max-width: 768px) {
  html, body { overflow: auto; }

  .panels {
    flex-direction: column;
    height: auto;
  }

  .panel {
    width: 100% !important;
    height: 60vw;
    min-height: 260px;
  }

  .panels:has(.panel:hover) .panel,
  .panels:has(.panel:hover) .panel:hover {
    width: 100%;
  }

  .panel__label-vertical {
    transform: translate(-50%, -50%);
    font-size: 2rem;
  }

  .panel__content {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
    bottom: 32px;
    left: 28px;
  }

  .panel__heading { font-size: 2.8rem; }
}