/* Reset */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; min-height: 100vh; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #e5e5e5;
  padding: 24px;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

body.is-expanded {
  padding: 0;
  background: #1a1a1a;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: url(assets/full-image.jpg);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0;
  pointer-events: none;
  transition: opacity 1.6s cubic-bezier(0.25, 0.1, 0.25, 1);
}

body.is-expanded::after {
  opacity: 1;
}

.page {
  max-width: 1150px;
  width: 100%;
  margin-top: 4vh;
  transition: max-width 1s cubic-bezier(0.25, 0.1, 0.25, 1) 1s,
              margin 1s cubic-bezier(0.25, 0.1, 0.25, 1) 1s,
              padding 1s cubic-bezier(0.25, 0.1, 0.25, 1) 1s,
              width 1s cubic-bezier(0.25, 0.1, 0.25, 1) 1s,
              height 1s cubic-bezier(0.25, 0.1, 0.25, 1) 1s;
}

body.is-expanded .page {
  position: fixed;
  inset: 0;
  max-width: none;
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}

body.is-expanded .page::after {
  content: '';
  position: absolute;
  inset: 12%;
  border-radius: 24px;
  background: rgba(0, 0, 0, 0.35);
  pointer-events: none;
  opacity: 0;
  animation: darkenCenter 0.8s cubic-bezier(0.25, 0.1, 0.25, 1) 1.5s forwards;
}

@keyframes darkenCenter {
  to { opacity: 1; }
}

.welcome-overlay {
  display: none;
  position: absolute;
  inset: 12%;
  z-index: 2;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px;
  pointer-events: none;
}

body.is-expanded .welcome-overlay {
  display: flex;
}

.welcome-flip-container {
  position: relative;
  width: 100%;
  height: 100%;
  perspective: 1200px;
  pointer-events: auto;
}

.welcome-flip-container.flipped {
  transform: rotateY(180deg);
}

.welcome-flip-front,
.welcome-flip-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 24px;
}

.welcome-flip-container {
  transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
}

.welcome-flip-front {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transform: rotateY(0deg);
}

.welcome-flip-back {
  transform: rotateY(180deg);
}

.welcome-flip-back-inner {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.welcome-flip-back .welcome-arrow {
  position: absolute;
  right: 10%;
  top: 50%;
  transform: translateY(-50%);
  opacity: 1;
  z-index: 2;
}

.welcome-arrow-back {
  pointer-events: none;
}

.welcome-contact {
  text-align: center;
}

.welcome-contact-line {
  margin: 0 0 12px 0;
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: #fff;
  line-height: 1.5;
}

.welcome-contact-line:last-child {
  margin-bottom: 0;
}

.welcome-overlay .welcome-title {
  margin: 0 0 24px 0;
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.02em;
  line-height: 1.3;
}

.welcome-overlay .welcome-body {
  max-width: 42ch;
  margin: 0;
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: rgba(255, 255, 255, 0.92);
  line-height: 1.6;
}

.welcome-overlay .welcome-body .typewriter-cursor {
  visibility: hidden;
}

.welcome-overlay .typewriter-cursor {
  display: inline-block;
  margin-left: 1px;
  color: #fff;
  font-weight: 300;
  animation: blink 0.9s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

.welcome-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.welcome-arrow {
  position: absolute;
  right: 10%;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.95);
  background: rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.5s cubic-bezier(0.25, 0.1, 0.25, 1);
  cursor: pointer;
  padding: 0;
  font: inherit;
  appearance: none;
  -webkit-appearance: none;
  z-index: 2;
}

.welcome-arrow.visible {
  opacity: 1;
}

.welcome-arrow span {
  color: #fff;
  font-size: 1.35rem;
  font-weight: 400;
  line-height: 1;
  margin-left: 3px;
  text-shadow: 0 0 8px rgba(0, 0, 0, 0.4);
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  aspect-ratio: 4 / 3;
  max-width: 100%;
  transition: aspect-ratio 1s cubic-bezier(0.25, 0.1, 0.25, 1) 1s,
              width 1s cubic-bezier(0.25, 0.1, 0.25, 1) 1s,
              height 1s cubic-bezier(0.25, 0.1, 0.25, 1) 1s,
              gap 1s cubic-bezier(0.25, 0.1, 0.25, 1) 1s,
              max-width 1s cubic-bezier(0.25, 0.1, 0.25, 1) 1s,
              max-height 1s cubic-bezier(0.25, 0.1, 0.25, 1) 1s;
}

body.is-expanded .grid {
  width: 100%;
  height: 100%;
  max-width: min(calc(100vh * 4 / 3), 100%);
  max-height: min(calc(100vw * 3 / 4), 100%);
  aspect-ratio: 4 / 3;
  gap: 24px;
}

.col {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-height: 0;
  transition: gap 1s cubic-bezier(0.25, 0.1, 0.25, 1) 1s;
}

body.is-expanded .col {
  gap: 24px;
}

.col-2 {
  justify-content: center;
}

.col-3 {
  justify-content: space-between;
}

.card {
  border-radius: 16px;
  overflow: hidden;
  aspect-ratio: 1;
  width: 100%;
  flex-shrink: 0;
  background-image: url(assets/full-image.jpg);
  background-size: 400% 300%;
  background-repeat: no-repeat;
  background-color: #ccc;
  cursor: pointer;
  transform-origin: center center;
  transition: transform 0.85s cubic-bezier(0.25, 0.1, 0.25, 1),
              opacity 0.85s cubic-bezier(0.25, 0.1, 0.25, 1),
              border-radius 0.85s cubic-bezier(0.25, 0.1, 0.25, 1),
              box-shadow 0.85s cubic-bezier(0.25, 0.1, 0.25, 1);
}

body.is-expanded .card {
  transform: scale(0.4);
  opacity: 0;
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.12);
  pointer-events: none;
}

.card-1 { background-position: 0% 0%; }
.card-2 { background-position: 0% 50%; }
.card-3 { background-position: 25% 0%; }
.card-4 { background-position: 25% 50%; }
.card-5 { background-position: 25% 100%; }
.card-6 { background-position: 50% 0%; }
.card-7 { background-position: 50% 50%; }
.card-8 { background-position: 75% 0%; }
.card-9 { background-position: 75% 50%; }
.card-10 { background-position: 75% 100%; }