html {
  overflow-y: scroll;
  height: 100%;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  margin: 0;
  min-height: 100%;
  background-color: #000000;
  color: #ffffff;
  overflow-x: hidden;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: #1d4ed8;
  color: #fff;
}

::-moz-selection {
  background: #1d4ed8;
  color: #fff;
}

.about-hero {
  padding: 120px 0 10px;
  text-align: center;
}

.about-content {
  max-width: 600px;
  margin: 0 auto;
  padding: 25px 1.5rem 80px;
}

.story-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.about-section {
  margin-bottom: 80px;
}

.about-section h2 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  color: #ffffff;
}

.about-section p {
  font-size: 1.15rem;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 1.5rem;
}

.portfolio-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.portfolio-list li {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.5);
  position: relative;
  padding-left: 20px;
  line-height: 1.6;
}

.portfolio-list li::before {
  content: "•";
  color: rgba(255, 255, 255, 0.25);
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -2px;
}

.about-section strong {
  color: #ffffff;
  font-weight: 500;
}

.reveal-on-scroll {
  opacity: 0;
  filter: blur(15px);
  transform: translateX(-40px) scale(0.98);
  transition: opacity 1.2s cubic-bezier(0.16, 1, 0.3, 1), 
              filter 1.2s cubic-bezier(0.16, 1, 0.3, 1), 
              transform 1.2s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, filter, transform;
}

.reveal-on-scroll.visible {
  opacity: 1;
  filter: blur(0);
  transform: translateX(0) scale(1);
}

.reveal-delay-1 { transition-delay: 0.15s; }
.reveal-delay-2 { transition-delay: 0.3s; }
.reveal-delay-3 { transition-delay: 0.45s; }

.about-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
  margin: 24px 0;
  width: 100vw;
  position: relative;
  left: 50%;
  right: 50%;
  margin-left: -50vw;
  margin-right: -50vw;
}

@media (max-width: 768px) {
  .about-hero {
    padding-top: 100px;
  }
  .story-title {
    font-size: 2.2rem;
    margin-bottom: 30px;
  }
  .about-section p {
    font-size: 1.1rem;
  }
}

.concept-inline {
  color: #ffffff;
  font-weight: 700;
  cursor: help;
  text-decoration: underline dotted rgba(255, 255, 255, 0.3);
  text-underline-offset: 4px;
  transition: color 0.15s ease;
  padding: 2px 0;
  white-space: nowrap;
}

.concept-inline:hover {
  text-decoration-style: solid;
}

.concept-inline.perf:hover { color: #52ff66; text-decoration-color: #52ff66; }
.concept-inline.sec:hover { color: #529aff; text-decoration-color: #529aff; }
.concept-inline.acc:hover { color: #ffa500; text-decoration-color: #ffa500; }
.concept-inline.back:hover { color: #8352ff; text-decoration-color: #8352ff; }
.concept-inline.game:hover { color: #8352ff; text-decoration-color: #8352ff; }
.concept-inline.tool:hover { color: #00e5ff; text-decoration-color: #00e5ff; }
.concept-inline.anno:hover { color: #ff5252; text-decoration-color: #ff5252; }
.concept-inline.xo:hover { color: #3b82f6; text-decoration-color: #3b82f6; }

#concept-tooltip {
  position: fixed;
  z-index: 10000;
  background: rgba(10, 10, 10, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 14px 18px;
  box-shadow: 0 15px 30px -5px rgba(0, 0, 0, 0.4);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transform: scale(0.92) translateZ(0);
  transition: opacity 0.15s ease, transform 0.15s cubic-bezier(0.2, 0, 0.2, 1), visibility 0.15s ease;
  max-width: 280px;
  line-height: 1.4;
  will-change: transform, opacity;
  backface-visibility: hidden;
  -webkit-font-smoothing: subpixel-antialiased;
  transform-origin: center center;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

#concept-tooltip.visible {
  opacity: 1;
  visibility: visible;
  transform: scale(1) translateZ(0);
  pointer-events: auto;
}

.tooltip-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.tooltip-media {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
}

.tooltip-icon {
  font-size: 1.25rem !important;
}

.tooltip-image {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  object-fit: contain;
}

.tooltip-label {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.tooltip-content {
  display: block;
  color: #fff;
  font-size: 0.95rem;
  font-weight: 500;
  line-height: 1.5;
  margin-bottom: 12px;
}

#tooltip-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 4px;
}

.tooltip-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
  padding: 8px 12px;
  color: #fff;
  text-decoration: none;
  font-size: 0.8125rem;
  font-weight: 600;
  transition: all 0.2s ease;
  pointer-events: auto;
}

.tooltip-action:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.2);
}

.tooltip-action .material-symbols-rounded {
  font-size: 1.1rem !important;
  opacity: 0.7;
}

#concept-tooltip.perf .tooltip-label, #concept-tooltip.perf .tooltip-icon { color: #52ff66; }
#concept-tooltip.sec .tooltip-label, #concept-tooltip.sec .tooltip-icon { color: #529aff; }
#concept-tooltip.acc .tooltip-label, #concept-tooltip.acc .tooltip-icon { color: #ffa500; }
#concept-tooltip.back .tooltip-label, #concept-tooltip.back .tooltip-icon { color: #8352ff; }
#concept-tooltip.game .tooltip-label, #concept-tooltip.game .tooltip-icon { color: #8352ff; }
#concept-tooltip.tool .tooltip-label, #concept-tooltip.tool .tooltip-icon { color: #00e5ff; }
#concept-tooltip.anno .tooltip-label, #concept-tooltip.anno .tooltip-icon { color: #ff5252; }
#concept-tooltip.xo .tooltip-label, #concept-tooltip.xo .tooltip-icon { color: #3b82f6; }

@media (max-width: 768px) {
  #concept-tooltip {
    max-width: 92%;
    width: 340px;
    padding: 20px;
    border-radius: 20px 20px 0 0;
    left: 50% !important;
    top: auto !important;
    bottom: 0;
    transform: translateX(-50%) translateY(10px) scale(0.92);
    transition: opacity 0.15s ease, transform 0.15s cubic-bezier(0.34, 1, 0.64, 1), visibility 0.15s ease;
  }
  #concept-tooltip.visible {
    transform: translateX(-50%) translateY(0) scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal-on-scroll {
    transition: opacity 0.4s ease !important;
    transform: none !important;
    filter: none !important;
  }
  
  .reveal-on-scroll.visible {
    opacity: 1 !important;
    transform: none !important;
    filter: none !important;
  }

  .about-hero, .about-section, .about-divider {
    transition-delay: 0s !important;
  }
}