/* ==========================================================================
   Building Tangrams Tower - Production CSS
   Optimized for GitHub Pages & Cloudflare Pages hosting
   ========================================================================== */

:root {
  --bg-color: #0a0b10;
  --bg-gradient-start: #141622;
  --text-color: #e2e8f0;
  --accent-glow: rgba(56, 189, 248, 0.14);
  --font-family: 'Plus Jakarta Sans', system-ui, sans-serif;
  --letter-spacing: 0.16em;
  --image-max-size: 270px;
}

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

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Centering Stage */
.stage-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  width: 100vw;
  padding: 2rem;
  position: relative;
  background: radial-gradient(
    circle at center,
    var(--bg-gradient-start) 0%,
    var(--bg-color) 75%
  );
}

/* Content Lockup */
.content-lockup {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 2.25rem;
  z-index: 2;
  user-select: none;
}

/* Image Wrapper with Ambient Glow */
.image-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--image-max-size);
  height: var(--image-max-size);
}

.center-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  z-index: 2;
  filter: drop-shadow(0 12px 24px rgba(0, 0, 0, 0.55));
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), filter 0.4s ease;
}

.center-image:hover {
  transform: translateY(-4px) scale(1.02);
  filter: drop-shadow(0 20px 32px var(--accent-glow));
}

/* Subtle Backlight Glow */
.ambient-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120%;
  height: 120%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  z-index: 1;
  pointer-events: none;
  opacity: 0.75;
}

/* Caption Text */
.caption-text {
  font-size: clamp(1.15rem, 3vw, 1.65rem);
  font-weight: 400;
  letter-spacing: var(--letter-spacing);
  color: var(--text-color);
  opacity: 0.92;
  text-wrap: balance;
  transition: opacity 0.3s ease, letter-spacing 0.3s ease;
}

.caption-text:hover {
  opacity: 1;
  letter-spacing: calc(var(--letter-spacing) + 0.04em);
}

@media (max-width: 640px) {
  :root {
    --image-max-size: 216px;
  }
  .content-lockup {
    gap: 1.75rem;
  }
}