* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body, html {
  width: 100vw;
  height: 100dvh;
  margin: 0;
  padding: 0;
  overflow: hidden;
  font-family: 'Manrope', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:root {
  --color-bg: #0d0d0f;
  --color-white: #f5f5f4;
  --color-gray-light: #a3a3a3;
  --color-gray-medium: #525252;
  --color-border: rgba(255, 255, 255, 0.08);
}

.app-container {
  display: flex;
  flex-direction: column;
  width: 100vw;
  height: 100dvh;
  position: relative;
}

.header {
  height: 16vh;
  min-height: 100px;
  max-height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 20;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.lang-selector {
  position: relative;
  width: 100%;
  max-width: 1400px;
  height: 100%;
  display: flex;
  align-items: center;
}

.lang-item {
  position: absolute;
  top: 45%;
  background: transparent;
  border: none;
  text-align: center;
  white-space: nowrap;
  outline: none;
  transition: all 0.7s cubic-bezier(0.25, 1, 0.3, 1);
  will-change: transform, left, top, opacity;
}

.lang-brand {
  font-weight: 500;
  font-size: 2.2rem;
  letter-spacing: 0.08em;
  color: var(--color-white);
  margin-bottom: 0.3rem;
  transition: color 0.4s ease;
}

.lang-sub {
  font-weight: 400;
  font-size: 0.65rem;
  letter-spacing: 0.3em;
  color: var(--color-gray-light);
  text-transform: uppercase;
  transition: opacity 0.4s ease;
}

.lang-loc {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.35em;
  color: var(--color-gray-light);
  text-transform: uppercase;
  margin-top: 1.8rem;
  opacity: 0;
  transition: opacity 0.5s ease;
  pointer-events: none;
}

.loc-icon {
  width: 0.85rem;
  height: 0.85rem;
  stroke: var(--color-gray-light);
  flex-shrink: 0;
  margin-right: -0.1rem;
}

.lang-item.pos-center .lang-loc {
  opacity: 0.85;
}

.lang-hint {
  position: absolute;
  top: -1.1rem;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--color-gray-medium);
  text-transform: uppercase;
  white-space: nowrap;
  opacity: 1;
  transition: opacity 0.6s ease, transform 0.6s ease;
  pointer-events: none;
  will-change: transform, opacity;
}

.lang-item.pos-center .lang-hint {
  opacity: 0;
  transform: translateX(-50%) translateY(10px);
}

.lang-item.pos-left {
  left: 5%;
  transform: translateY(-50%) scale(0.6);
  opacity: 0.4;
  cursor: pointer;
  z-index: 10;
}

.lang-item.pos-right {
  left: 95%;
  transform: translate(-100%, -50%) scale(0.6);
  opacity: 0.4;
  cursor: pointer;
  z-index: 10;
}

.lang-item.pos-center {
  left: 50%;
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
  cursor: default;
  pointer-events: none;
  z-index: 15;
}

.lang-item.pos-left:hover {
  opacity: 0.8;
  transform: translateY(-50%) scale(0.63);
}
.lang-item.pos-right:hover {
  opacity: 0.8;
  transform: translate(-100%, -50%) scale(0.63);
}
.lang-item.pos-left:hover .lang-brand,
.lang-item.pos-right:hover .lang-brand {
  color: #fff;
}

.panels-container {
  display: flex;
  flex: 1;
  width: 100%;
  position: relative;
  z-index: 10;
  background-color: #000;
}

.panel {
  flex: 1;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-decoration: none;
  overflow: hidden;
  transition: flex 0.7s cubic-bezier(0.25, 1, 0.3, 1);
  border-right: 1px solid var(--color-border);
  cursor: pointer;
  will-change: flex;
}

.panel:last-child {
  border-right: none;
}

.panel-bg {
  position: absolute;
  top: 0; left: 0; 
  width: 100%; height: 100%;
  background-size: cover;
  background-position: center;
  filter: grayscale(85%) brightness(0.35) contrast(1.1);
  opacity: 0.7;
  transform: scale(1) translateZ(0);
  transition: filter 0.7s ease, opacity 0.7s ease, transform 10s ease-out;
  will-change: transform, filter, opacity;
  z-index: 1;
}

.panel-overlay {
  position: absolute;
  top: 0; left: 0; 
  width: 100%; height: 100%;
  background: linear-gradient(to bottom, rgba(13, 13, 15, 0.1) 0%, rgba(13, 13, 15, 0.85) 100%);
  z-index: 2;
  transition: background 0.7s ease, opacity 0.7s ease;
}

.panel-content {
  position: relative;
  z-index: 3;
  width: 100%;
  height: 100%;
}

.panel-title-wrapper {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  text-align: center;
  transition: transform 0.7s cubic-bezier(0.25, 1, 0.3, 1);
  will-change: transform;
}

.panel-title {
  font-weight: 500;
  font-size: 2.2rem;
  letter-spacing: 0.2em;
  color: var(--color-white);
  margin: 0;
  text-transform: uppercase;
  transform: scale(1) translateZ(0);
  transition: transform 0.7s cubic-bezier(0.25, 1, 0.3, 1), letter-spacing 0.7s ease, color 0.7s ease;
  will-change: transform;
}

.panel-details {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 75%;
  max-width: 400px;
  transform: translate(-50%, calc(-50% + 40px));
  opacity: 0;
  transition: opacity 0.6s ease, transform 0.7s cubic-bezier(0.25, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  pointer-events: none;
  will-change: transform, opacity;
}

.panel-desc {
  font-weight: 300;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-gray-light);
  margin-bottom: 2rem;
}

.panel-cta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  color: var(--color-white);
  text-transform: uppercase;
  border-bottom: 1px solid rgba(255,255,255,0.3);
  padding-bottom: 0.2rem;
  transition: gap 0.3s ease, border-color 0.3s ease;
}

.cta-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s ease;
}
.cta-arrow svg {
  display: block;
  pointer-events: none;
}

@media (min-width: 769px) {
  .panel:hover {
    flex: 1.8;
  }

  .panel:hover .panel-bg {
    filter: grayscale(15%) brightness(0.65) contrast(1.05);
    opacity: 0.95;
    transform: scale(1.04) translateZ(0);
    transition: filter 0.7s ease, opacity 0.7s ease, transform 4s cubic-bezier(0.25, 1, 0.3, 1);
  }

  .panel:hover .panel-overlay {
    background: linear-gradient(to bottom, rgba(13, 13, 15, 0.2) 0%, rgba(13, 13, 15, 0.95) 100%);
  }

  .panel:hover .panel-title-wrapper {
    transform: translate(-50%, calc(-50% - 70px));
  }

  .panel:hover .panel-title {
    transform: scale(1.18) translateZ(0);
    letter-spacing: 0.25em;
  }

  .panel:hover .panel-details {
    opacity: 1;
    transform: translate(-50%, calc(-50% + 40px));
    transition-delay: 0.05s;
  }

  .panel:hover .panel-cta {
    gap: 1rem;
    border-color: rgba(255,255,255,0.8);
  }

  .panels-container:hover .panel:not(:hover) .panel-bg {
    filter: grayscale(100%) brightness(0.2);
  }
  .panels-container:hover .panel:not(:hover) .panel-title {
    color: var(--color-gray-medium);
  }
}

.panel:focus-visible {
  outline: 2px solid var(--color-white);
  outline-offset: -2px;
}
.lang-item:focus-visible {
  outline: 2px solid var(--color-white);
  outline-offset: 4px;
  border-radius: 4px;
}

@media (max-width: 768px) {
  .header {
    height: 15vh;
    min-height: 100px;
  }
  
  .lang-brand {
    font-size: 1.4rem;
  }
  
  .lang-sub {
    font-size: 0.5rem;
    letter-spacing: 0.15em;
  }
  
  .lang-loc {
    font-size: 0.55rem;
    letter-spacing: 0.22em;
    margin-top: 1.4rem;
    gap: 0.25rem;
  }
  
  .loc-icon {
    width: 0.65rem;
    height: 0.65rem;
  }
  
  .lang-hint {
    font-size: 0.85rem;
    top: -1.2rem;
  }
  
  /* Triangle layout for mobile to prevent text overlap */
  .lang-item.pos-center {
    top: 35%;
    transform: translate(-50%, -50%) scale(1);
    transform-origin: center center;
  }

  .lang-item.pos-left {
    top: 75%;
    left: 5%;
    transform: translateY(-50%) scale(0.55);
    transform-origin: left center;
  }
  
  .lang-item.pos-right {
    top: 75%;
    left: 95%;
    transform: translate(-100%, -50%) scale(0.55);
    transform-origin: right center;
  }

  .lang-item:not(.pos-center) .lang-sub,
  .lang-item:not(.pos-center) .lang-loc {
    opacity: 0;
  }

  .panels-container {
    flex-direction: column;
  }
  
  .panel {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
  
  .panel-title {
    font-size: 1.6rem;
    letter-spacing: 0.15em;
    transform: scale(1) translateZ(0);
  }

  .panel.active {
    flex: 2.5;
  }

  .panel.active .panel-bg {
    filter: grayscale(15%) brightness(0.6) contrast(1.05);
    opacity: 0.95;
    transform: scale(1.05) translateZ(0);
  }

  .panel.active .panel-title-wrapper {
    transform: translate(-50%, calc(-50% - 50px));
  }
  
  .panel.active .panel-title {
    transform: scale(1.13) translateZ(0);
  }

  .panel.active .panel-details {
    opacity: 1;
    transform: translate(-50%, calc(-50% + 30px));
  }
}

@media (max-width: 480px) {
  .lang-brand { font-size: 1.25rem; }
  .lang-item.pos-left { transform: translateY(-50%) scale(0.5); }
  .lang-item.pos-right { transform: translate(-100%, -50%) scale(0.5); }
  
  .panel-title { font-size: 1.3rem; transform: scale(1) translateZ(0); }
  .panel.active .panel-title { transform: scale(1.15) translateZ(0); }
  .panel.active .panel-title-wrapper { transform: translate(-50%, calc(-50% - 40px)); }
  .panel.active .panel-details { transform: translate(-50%, calc(-50% + 25px)); width: 90%; }
  .panel-desc { font-size: 0.8rem; margin-bottom: 1rem; }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .lang-brand { font-size: 1.8rem; }
  .lang-sub { font-size: 0.55rem; letter-spacing: 0.2em; }
  .panel-title { font-size: 1.6rem; letter-spacing: 0.1em; transform: scale(1) translateZ(0); }
  .panel:hover .panel-title { transform: scale(1.19) translateZ(0); }
  .panel-desc { font-size: 0.8rem; }
  .panel-details { width: 90%; }
}

@media (prefers-reduced-motion: reduce) {
  *, ::before, ::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}