/**
 * About Page Styles
 * Narrative Editorial Design - Professional Portfolio
 * ストーリーテリング重視のエディトリアルデザイン
 */

/* ============================================
   About Page Container
   ============================================ */
.about-page {
  width: 100%;
  max-width: 100vw;
  overflow-x: hidden;
  background-color: var(--bg-main);
}

/* Prevent any element from causing horizontal scroll */
.about-page * {
  max-width: 100%;
  box-sizing: border-box;
}

/* Images should never overflow */
.about-page img {
  max-width: 100%;
  height: auto;
}

/* Section Fade-in Animation */
.about-page section {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1s var(--ease-out-expo), transform 1s var(--ease-out-expo);
}

.about-page section.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Common Section Styles */
.about-page .section {
  padding: var(--space-section) 0;
}

.about-page .section--alt {
  background-color: var(--bg-sub);
}

.about-page .section--dark {
  background: var(--gradient-dark);
}

/* Section Header Common */
.about-section__eyebrow {
  display: inline-block;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-widest);
  text-transform: uppercase;
  color: var(--accent-main);
  margin-bottom: var(--space-sm);
}

.about-section__eyebrow--light {
  color: var(--forest-300);
}

.about-section__title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xxxl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-main);
  margin: 0 0 var(--space-md);
  letter-spacing: var(--letter-spacing-tight);
  line-height: var(--line-height-tight);
}

.about-section__title--light {
  color: var(--text-invert);
}

/* ============================================
   Scroll Indicator (Progress Bar)
   ============================================ */
.scroll-indicator {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.1);
  z-index: 9999;
  pointer-events: none;
}

.scroll-indicator__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-main), var(--forest-300), var(--gold-400));
  transition: width 0.1s ease-out;
  box-shadow: 0 0 10px rgba(45, 90, 71, 0.5);
}

/* ============================================
   Hero Section - Full Impact Opening
   ============================================ */
.about-hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: var(--space-section) 0;
}

.about-hero__bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 0;
}

.about-hero__gradient {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    linear-gradient(135deg, var(--forest-900) 0%, var(--forest-800) 50%, var(--forest-700) 100%);
}

.about-hero__pattern {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(45, 96, 71, 0.25) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 70%, rgba(45, 96, 71, 0.2) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 100%, rgba(45, 96, 71, 0.15) 0%, transparent 40%);
  opacity: 1;
}

/* Subtle grid pattern */
.about-hero__pattern::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.5;
}

.about-hero__content {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  text-align: center;
}

.about-hero__eyebrow {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-widest);
  text-transform: uppercase;
  color: var(--forest-200);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-lg);
}

.about-hero__title {
  margin-bottom: var(--space-xl);
}

.about-hero__title-line {
  display: block;
  font-family: var(--font-family-display);
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: var(--font-weight-semibold);
  color: var(--text-invert);
  line-height: 1.1;
  letter-spacing: var(--letter-spacing-tight);
}

.about-hero__title-line--accent {
  background: linear-gradient(135deg, var(--forest-200) 0%, var(--forest-300) 50%, var(--gold-400) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.about-hero__lead {
  max-width: 700px;
  margin: 0 auto var(--space-xxl);
  font-size: var(--font-size-lg);
  color: rgba(255, 255, 255, 0.8);
  line-height: var(--line-height-relaxed);
}

/* Stats */
.about-hero__stats {
  display: flex;
  justify-content: center;
  gap: var(--space-xxl);
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.about-hero__stat {
  text-align: center;
}

.about-hero__stat-number {
  display: block;
  font-family: var(--font-family-display);
  font-size: var(--font-size-display);
  font-weight: var(--font-weight-semibold);
  color: var(--text-invert);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.about-hero__stat-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.6);
}

/* ============================================
   Hero Scroll Link Enhancement
   ============================================ */
.about-hero__scroll-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  margin-top: var(--space-xxl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--text-invert);
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  text-decoration: none;
  backdrop-filter: blur(10px);
  transition: all var(--transition-base) var(--ease-out-cubic);
  cursor: pointer;
  animation: bounce-vertical 2s ease-in-out infinite;
}

@keyframes bounce-vertical {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

.about-hero__scroll-link:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
  animation: none;
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.about-hero__scroll-link svg {
  transition: transform var(--transition-fast);
}

.about-hero__scroll-link:hover svg {
  transform: translateY(4px);
}

/* Scroll Indicator - Legacy support */
.about-hero__scroll {
  position: absolute;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: rgba(255, 255, 255, 0.5);
  font-size: var(--font-size-xs);
  letter-spacing: var(--letter-spacing-widest);
  text-transform: uppercase;
  animation: float 2s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-8px); }
}

/* ============================================
   Profile Section
   ============================================ */
.about-profile__grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-xxxl, 6rem);
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
}

.about-profile__info {
  display: flex;
  flex-direction: column;
}

.about-profile__role {
  font-size: var(--font-size-xl);
  color: var(--accent-main);
  margin-bottom: var(--space-xl);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wide);
}

.about-profile__bio {
  margin-bottom: var(--space-xl);
}

.about-profile__bio p {
  font-size: var(--font-size-lg);
  color: var(--text-main);
  line-height: 1.9;
  margin-bottom: var(--space-lg);
}

.about-profile__bio p:last-child {
  margin-bottom: 0;
}

.about-profile__bio strong {
  color: var(--accent-main);
  font-weight: var(--font-weight-semibold);
  background: linear-gradient(transparent 60%, rgba(45, 90, 71, 0.12) 60%);
  padding: 0 0.1em;
}

.about-profile__details {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-soft);
}

.about-profile__detail {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-base);
  color: var(--text-main);
  font-weight: var(--font-weight-medium);
}

.about-profile__detail-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-soft), rgba(45, 90, 71, 0.08));
  border-radius: var(--radius-full);
  color: var(--accent-main);
}

/* Code Card Visual */
.about-profile__visual {
  display: flex;
  justify-content: center;
}

.about-profile__card {
  width: 100%;
  max-width: 440px;
  background: linear-gradient(145deg, var(--forest-900), #1a2f26);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow:
    0 8px 32px rgba(26, 31, 28, 0.2),
    0 16px 48px rgba(45, 90, 71, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.about-profile__card-header {
  display: flex;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-lg);
  background: rgba(0, 0, 0, 0.25);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.about-profile__card-dot {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.2);
}

.about-profile__card-dot:nth-child(1) { background: #ff5f57; }
.about-profile__card-dot:nth-child(2) { background: #ffbd2e; }
.about-profile__card-dot:nth-child(3) { background: #28ca42; }

.about-profile__card-content {
  padding: var(--space-xl);
}

.about-profile__code {
  display: block;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  font-size: var(--font-size-base);
  line-height: 2;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.02em;
}

.code-keyword { color: #c678dd; font-weight: 500; }
.code-variable { color: #e5c07b; }
.code-property { color: #61afef; }
.code-string { color: #98c379; }

/* ============================================
   Career Timeline
   ============================================ */

/* Keyframe Animations */
@keyframes timeline-pulse {
  0%, 100% {
    box-shadow:
      0 0 0 3px var(--accent-main),
      0 0 12px rgba(45, 90, 71, 0.3);
  }
  50% {
    box-shadow:
      0 0 0 5px rgba(45, 90, 71, 0.4),
      0 0 20px rgba(45, 90, 71, 0.4);
  }
}

@keyframes timeline-shine {
  0% {
    left: -100%;
  }
  100% {
    left: 200%;
  }
}

/* Section Background - Rich layered texture */
.about-career {
  position: relative;
  background:
    radial-gradient(ellipse 100% 80% at 0% 0%, rgba(45, 90, 71, 0.04) 0%, transparent 50%),
    radial-gradient(ellipse 80% 60% at 100% 100%, rgba(45, 90, 71, 0.03) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(45, 90, 71, 0.015) 0%, transparent 70%),
    linear-gradient(180deg, var(--bg-sub) 0%, var(--bg-main) 100%);
  overflow: hidden;
}

/* Decorative background pattern */
.about-career::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(45, 90, 71, 0.03) 1px, transparent 1px),
    radial-gradient(circle at 80% 70%, rgba(45, 90, 71, 0.02) 1px, transparent 1px);
  background-size: 60px 60px, 80px 80px;
  pointer-events: none;
}

.about-career__header {
  text-align: center;
  margin-bottom: var(--space-xxl);
  position: relative;
}

.about-career__lead {
  max-width: 600px;
  margin: var(--space-md) auto 0;
  font-size: var(--font-size-base);
  color: var(--text-sub);
  line-height: var(--line-height-relaxed);
}

.about-timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding-left: 200px;
}

/* Vertical Line - Animated gradient with glow */
.about-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 160px;
  width: 3px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    var(--accent-main) 5%,
    var(--accent-strong) 50%,
    var(--accent-main) 95%,
    transparent 100%
  );
  border-radius: var(--radius-full);
  box-shadow:
    0 0 10px rgba(45, 90, 71, 0.25),
    0 0 30px rgba(45, 90, 71, 0.15),
    0 0 50px rgba(45, 90, 71, 0.05);
}

/* Decorative glow orb at timeline start */
.about-timeline::after {
  content: '';
  position: absolute;
  top: -20px;
  left: 152px;
  width: 20px;
  height: 20px;
  background: radial-gradient(circle, var(--accent-main) 0%, transparent 70%);
  border-radius: 50%;
  opacity: 0.6;
  filter: blur(8px);
}

.about-timeline__item {
  position: relative;
  display: flex;
  padding-bottom: var(--space-xxl);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease forwards;
}

.about-timeline__item:nth-child(1) { animation-delay: 0.1s; }
.about-timeline__item:nth-child(2) { animation-delay: 0.2s; }
.about-timeline__item:nth-child(3) { animation-delay: 0.3s; }
.about-timeline__item:nth-child(4) { animation-delay: 0.4s; }
.about-timeline__item:nth-child(5) { animation-delay: 0.5s; }

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.about-timeline__item:last-child {
  padding-bottom: 0;
}

/* Connector line from dot to card */
.about-timeline__item::before {
  content: '';
  position: absolute;
  top: calc(var(--space-xs) + 8px);
  left: -40px;
  width: 40px;
  height: 2px;
  background: linear-gradient(to right, var(--accent-main), rgba(45, 90, 71, 0.2));
  border-radius: var(--radius-full);
}

.about-timeline__marker {
  position: absolute;
  left: -200px;
  width: 200px;
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding-top: var(--space-xs);
}

/* Year Badge - Premium pill with shine effect */
.about-timeline__year {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.about-timeline__year span,
.about-timeline__year {
  position: relative;
  display: inline-block;
  padding: var(--space-2xs) var(--space-lg);
  font-family: var(--font-family-display);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--bg-main);
  background: linear-gradient(135deg, var(--accent-main) 0%, var(--accent-strong) 100%);
  border-radius: var(--radius-full);
  letter-spacing: var(--letter-spacing-wider);
  box-shadow:
    0 2px 4px rgba(45, 90, 71, 0.2),
    0 4px 12px rgba(45, 90, 71, 0.25),
    inset 0 1px 0 rgba(255, 255, 255, 0.15),
    inset 0 -1px 0 rgba(0, 0, 0, 0.1);
  text-align: center;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

/* Shine effect on year badge */
.about-timeline__year::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transform: skewX(-20deg);
}

.about-timeline__item:hover .about-timeline__year::after {
  animation: timeline-shine 0.8s ease;
}

.about-timeline__item:hover .about-timeline__year {
  transform: scale(1.05);
  box-shadow:
    0 4px 8px rgba(45, 90, 71, 0.25),
    0 8px 20px rgba(45, 90, 71, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

/* Timeline Dot - Animated pulse */
.about-timeline__dot {
  position: relative;
  width: 18px;
  height: 18px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent-main), var(--accent-strong));
  border: 3px solid var(--bg-main);
  box-shadow:
    0 0 0 3px var(--accent-main),
    0 0 12px rgba(45, 90, 71, 0.3);
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.about-timeline__item:hover .about-timeline__dot {
  animation: timeline-pulse 1.5s ease infinite;
  transform: scale(1.1);
}

.about-timeline__dot::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 6px;
  height: 6px;
  background-color: var(--bg-main);
  border-radius: var(--radius-full);
}

/* Content Card - Enhanced with gradient border effect */
.about-timeline__content {
  flex: 1;
  position: relative;
  background-color: var(--bg-main);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  padding-left: calc(var(--space-xl) + 6px);
  box-shadow:
    0 1px 3px rgba(26, 31, 28, 0.04),
    0 4px 12px rgba(26, 31, 28, 0.06),
    0 12px 32px rgba(26, 31, 28, 0.06);
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base);
  overflow: hidden;
  background-clip: padding-box;
}

/* Gradient border effect */
.about-timeline__content::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(135deg, rgba(45, 90, 71, 0.1), transparent 50%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-base);
}

/* Left accent line - Thicker and more prominent */
.about-timeline__content::before {
  content: '';
  position: absolute;
  top: var(--space-md);
  left: 0;
  bottom: var(--space-md);
  width: 4px;
  background: linear-gradient(to bottom, var(--accent-main), var(--accent-strong));
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  box-shadow: 2px 0 8px rgba(45, 90, 71, 0.15);
}

/* Float-up hover effect with glow */
.about-timeline__content:hover {
  transform: translateY(-8px);
  box-shadow:
    0 8px 16px rgba(26, 31, 28, 0.08),
    0 16px 32px rgba(26, 31, 28, 0.1),
    0 24px 48px rgba(45, 90, 71, 0.12);
  border-color: rgba(45, 90, 71, 0.1);
}

.about-timeline__content:hover::after {
  opacity: 1;
}

.about-timeline__title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-main);
  margin: 0 0 var(--space-sm);
  letter-spacing: var(--letter-spacing-tight);
}

.about-timeline__text {
  font-size: var(--font-size-base);
  color: var(--text-sub);
  line-height: var(--line-height-relaxed);
  margin: 0 0 var(--space-lg);
}

.about-timeline__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* Semi-transparent pill tags with gradient border */
.about-timeline__tag {
  position: relative;
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--accent-main);
  background: linear-gradient(135deg, rgba(45, 90, 71, 0.06), rgba(45, 90, 71, 0.02));
  border: 1px solid rgba(45, 90, 71, 0.15);
  border-radius: var(--radius-full);
  backdrop-filter: blur(8px);
  transition:
    background var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
  letter-spacing: 0.02em;
}

.about-timeline__tag:hover {
  background: linear-gradient(135deg, rgba(45, 90, 71, 0.12), rgba(45, 90, 71, 0.06));
  border-color: rgba(45, 90, 71, 0.25);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(45, 90, 71, 0.1);
}

/* ============================================
   Skills Section
   ============================================ */
.about-skills__header {
  text-align: center;
  margin-bottom: var(--space-xxl);
}

.about-skills__lead {
  font-size: var(--font-size-xl);
  color: var(--text-sub);
  margin-top: var(--space-md);
  line-height: var(--line-height-relaxed);
}

.about-skills__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
  max-width: 1200px;
  margin: 0 auto;
}

.about-skills__category {
  padding: var(--space-xl) var(--space-lg);
  background-color: var(--bg-main);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-xl);
  text-align: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.about-skills__category:hover {
  transform: translateY(-8px);
  box-shadow:
    0 8px 24px rgba(26, 31, 28, 0.1),
    0 16px 40px rgba(45, 90, 71, 0.08);
  border-color: var(--accent-main);
}

.about-skills__category-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  margin: 0 auto var(--space-lg);
  background: var(--gradient-hero);
  border-radius: var(--radius-xl);
  color: var(--text-invert);
  box-shadow: 0 4px 16px rgba(45, 90, 71, 0.2);
}

.about-skills__category-icon svg {
  width: 36px;
  height: 36px;
}

.about-skills__category-title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-main);
  margin: 0 0 var(--space-md);
}

.about-skills__category-text {
  font-size: var(--font-size-base);
  color: var(--text-sub);
  line-height: 1.8;
  margin: 0;
}

/* ============================================
   Tech Stack Section (Dark)
   ============================================ */
.about-tech__header {
  text-align: center;
  margin-bottom: var(--space-xxl);
}

.about-tech__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
  max-width: 1100px;
  margin: 0 auto;
}

.about-tech__group {
  padding: var(--space-xl);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(10px);
}

.about-tech__group-title {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-invert);
  margin: 0 0 var(--space-xl);
}

.about-tech__group-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.05));
  border-radius: var(--radius-lg);
  color: var(--forest-300);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.about-tech__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.about-tech__tag {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: rgba(255, 255, 255, 0.95);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.05));
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  letter-spacing: 0.02em;
}

.about-tech__tag:hover {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0.08));
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-3px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

/* ============================================
   Values Section
   ============================================ */
.about-values__header {
  text-align: center;
  margin-bottom: var(--space-xxl);
}

.about-values__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl);
  max-width: 1100px;
  margin: 0 auto;
}

.about-values__item {
  position: relative;
  padding: var(--space-xxl);
  padding-left: calc(var(--space-xxl) + 72px);
  background: linear-gradient(145deg, var(--bg-main), var(--bg-sub));
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-xl);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.about-values__item:hover {
  transform: translateY(-6px);
  box-shadow:
    0 8px 24px rgba(26, 31, 28, 0.1),
    0 16px 40px rgba(45, 90, 71, 0.08);
  border-color: rgba(45, 90, 71, 0.2);
}

.about-values__number {
  position: absolute;
  top: var(--space-xl);
  left: var(--space-xl);
  font-family: var(--font-family-display);
  font-size: 3.5rem;
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--accent-main), var(--accent-strong));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  letter-spacing: var(--letter-spacing-tight);
  opacity: 0.25;
}

.about-values__item-title {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-xxl);
  font-weight: var(--font-weight-semibold);
  color: var(--text-main);
  margin: 0 0 var(--space-md);
}

.about-values__item-text {
  font-size: var(--font-size-lg);
  color: var(--text-sub);
  line-height: 1.85;
  margin: 0;
}

/* ============================================
   CTA Section
   ============================================ */
.about-cta {
  background: var(--gradient-dark);
  text-align: center;
}

.about-cta__inner {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-xxxl, 6rem) var(--space-xxl);
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-2xl);
  backdrop-filter: blur(12px);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.about-cta__eyebrow {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-widest);
  text-transform: uppercase;
  color: var(--forest-300);
  margin-bottom: var(--space-lg);
}

.about-cta__title {
  font-family: var(--font-family-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: var(--font-weight-semibold);
  color: var(--text-invert);
  margin: 0 0 var(--space-xl);
  letter-spacing: var(--letter-spacing-tight);
  line-height: 1.3;
}

.about-cta__text {
  font-size: var(--font-size-xl);
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.9;
  margin: 0 0 var(--space-xxl);
}

.about-cta__actions {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
}

.about-cta__button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xxl);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  border-radius: var(--radius-full);
  transition: all var(--transition-base) var(--ease-out-cubic);
}

.about-cta__button--primary {
  color: var(--forest-900);
  background: linear-gradient(135deg, var(--text-invert), #f0f0f0);
  box-shadow:
    0 4px 16px rgba(0, 0, 0, 0.2),
    0 8px 32px rgba(255, 255, 255, 0.1);
}

.about-cta__button--primary:hover {
  transform: translateY(-4px);
  box-shadow:
    0 8px 24px rgba(0, 0, 0, 0.3),
    0 12px 40px rgba(255, 255, 255, 0.15);
  color: var(--forest-800);
}

.about-cta__button svg {
  transition: transform var(--transition-fast);
}

.about-cta__button:hover svg {
  transform: translateX(6px);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
  .about-skills__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-tech__grid {
    grid-template-columns: 1fr;
  }

  .about-timeline {
    padding-left: 160px;
  }

  .about-timeline::before {
    left: 130px;
  }

  .about-timeline::after {
    left: 122px;
  }

  .about-timeline__item::before {
    left: -30px;
    width: 30px;
  }

  .about-timeline__marker {
    left: -160px;
    width: 160px;
  }

  .about-timeline__year,
  .about-timeline__year span {
    padding: var(--space-2xs) var(--space-sm);
    font-size: var(--font-size-xs);
  }
}

@media (max-width: 768px) {
  .about-page .section {
    padding: var(--space-xl) 0;
  }

  /* Prevent horizontal overflow */
  .about-page {
    overflow-x: hidden;
  }

  /* Hero */
  .about-hero {
    min-height: auto;
    min-height: 100svh; /* Safari対応 */
    padding: var(--space-xxl) 0;
  }

  .about-hero__content {
    padding: 0 var(--space-lg);
    max-width: 100%;
  }

  .about-hero__eyebrow {
    font-size: 11px;
  }

  .about-hero__title-line {
    font-size: clamp(1.75rem, 8vw, 2.5rem);
    word-break: keep-all;
  }

  .about-hero__lead {
    font-size: var(--font-size-base);
    line-height: 1.8;
    word-break: auto-phrase;
  }

  .about-hero__stats {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
    margin-top: var(--space-xl);
  }

  .about-hero__stat {
    flex: 0 0 auto;
    min-width: 80px;
    padding: var(--space-sm) var(--space-md);
  }

  .about-hero__stat-number {
    font-size: var(--font-size-xxl);
  }

  .about-hero__stat-label {
    font-size: 10px;
  }

  .about-hero__scroll,
  .about-hero__scroll-link {
    display: none;
  }

  /* Profile */
  .about-profile__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .about-profile__visual {
    order: -1;
  }

  .about-profile__card {
    max-width: 100%;
  }

  .about-profile__card-content {
    padding: var(--space-md);
    overflow-x: auto;
  }

  .about-profile__code {
    font-size: var(--font-size-sm);
    white-space: nowrap;
    line-height: 1.8;
  }

  .about-profile__role {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-md);
  }

  .about-profile__bio {
    margin-bottom: var(--space-lg);
  }

  .about-profile__bio p {
    font-size: var(--font-size-base);
    line-height: 1.85;
    word-break: auto-phrase;
  }

  .about-profile__details {
    flex-direction: column;
    padding-top: var(--space-md);
    gap: var(--space-md);
  }

  .about-profile__detail {
    font-size: var(--font-size-sm);
  }

  .about-profile__detail-icon {
    width: 36px;
    height: 36px;
  }

  .about-section__title {
    font-size: var(--font-size-xl);
    word-break: keep-all;
  }

  .about-section__eyebrow {
    font-size: 11px;
  }

  /* Timeline - Mobile left-aligned */
  .about-career::before {
    background-size: 40px 40px, 50px 50px;
  }

  .about-timeline {
    padding-left: var(--space-xl);
  }

  .about-timeline::before {
    left: 7px;
    width: 2px;
    box-shadow:
      0 0 8px rgba(45, 90, 71, 0.2),
      0 0 16px rgba(45, 90, 71, 0.1);
  }

  .about-timeline::after {
    left: 0;
    width: 16px;
    height: 16px;
    top: -12px;
  }

  .about-timeline__item {
    padding-bottom: var(--space-xl);
    flex-direction: column;
    animation: none;
    opacity: 1;
    transform: none;
  }

  .about-timeline__item::before {
    display: none;
  }

  .about-timeline__marker {
    position: relative;
    left: 0;
    width: auto;
    flex-direction: row;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    padding-top: 0;
  }

  /* Year badge - compact on mobile */
  .about-timeline__year,
  .about-timeline__year span {
    padding: var(--space-2xs) var(--space-sm);
    font-size: var(--font-size-xs);
    order: 1;
  }

  .about-timeline__year::after {
    display: none;
  }

  .about-timeline__dot {
    position: absolute;
    left: calc(-1 * var(--space-xl) + 1px);
    top: 50%;
    transform: translateY(-50%);
    width: 14px;
    height: 14px;
    border-width: 2px;
    box-shadow:
      0 0 0 2px var(--accent-main),
      0 0 8px rgba(45, 90, 71, 0.2);
  }

  .about-timeline__dot::after {
    width: 4px;
    height: 4px;
  }

  .about-timeline__item:hover .about-timeline__dot {
    animation: none;
    transform: translateY(-50%) scale(1);
  }

  .about-timeline__content {
    padding: var(--space-lg);
    padding-left: calc(var(--space-lg) + 4px);
  }

  .about-timeline__content::before {
    top: var(--space-sm);
    bottom: var(--space-sm);
    width: 3px;
  }

  .about-timeline__content:hover {
    transform: translateY(-4px);
  }

  .about-timeline__title {
    font-size: var(--font-size-lg);
  }

  .about-timeline__text {
    margin-bottom: var(--space-md);
  }

  .about-timeline__tags {
    gap: var(--space-xs);
  }

  .about-timeline__tag {
    font-size: 0.6875rem;
    padding: var(--space-2xs) var(--space-sm);
  }

  /* Skills */
  .about-skills__header {
    margin-bottom: var(--space-xl);
  }

  .about-skills__grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .about-skills__lead {
    font-size: var(--font-size-base);
    line-height: 1.7;
  }

  .about-skills__category {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    text-align: left;
  }

  .about-skills__category-icon {
    margin: 0;
    flex-shrink: 0;
    width: 48px;
    height: 48px;
  }

  .about-skills__category-icon svg {
    width: 24px;
    height: 24px;
  }

  .about-skills__category-title {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-2xs);
  }

  .about-skills__category-text {
    font-size: var(--font-size-sm);
    line-height: 1.65;
  }

  /* Tech */
  .about-tech__header {
    margin-bottom: var(--space-xl);
  }

  .about-tech__grid {
    gap: var(--space-md);
  }

  .about-tech__group {
    padding: var(--space-md);
  }

  .about-tech__group-title {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-md);
    gap: var(--space-sm);
  }

  .about-tech__group-icon {
    width: 36px;
    height: 36px;
  }

  .about-tech__tags {
    gap: var(--space-xs);
  }

  .about-tech__tag {
    padding: var(--space-2xs) var(--space-sm);
    font-size: var(--font-size-xs);
  }

  /* Values */
  .about-values__header {
    margin-bottom: var(--space-xl);
  }

  .about-values__grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .about-values__item {
    padding: var(--space-lg);
  }

  .about-values__number {
    position: static;
    display: inline-block;
    font-size: 1.75rem;
    margin-bottom: var(--space-xs);
    opacity: 0.4;
  }

  .about-values__item-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-xs);
  }

  .about-values__item-text {
    font-size: var(--font-size-sm);
    line-height: 1.75;
  }

  /* CTA */
  .about-cta__inner {
    padding: var(--space-xl) var(--space-md);
    border-radius: var(--radius-xl);
  }

  .about-cta__eyebrow {
    font-size: 10px;
    margin-bottom: var(--space-sm);
  }

  .about-cta__title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-md);
    word-break: keep-all;
  }

  .about-cta__text {
    font-size: var(--font-size-base);
    line-height: 1.75;
    margin-bottom: var(--space-lg);
  }

  .about-cta__button {
    width: 100%;
    justify-content: center;
    font-size: var(--font-size-sm);
    padding: var(--space-md) var(--space-lg);
  }
}

@media (max-width: 480px) {
  /* General */
  .about-page .section {
    padding: var(--space-lg) 0;
  }

  .container {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  /* Hero - Extra small screens */
  .about-hero {
    min-height: 100svh;
    padding: var(--space-xl) 0;
  }

  .about-hero__content {
    padding: 0 var(--space-md);
  }

  .about-hero__eyebrow {
    font-size: 9px;
    padding: var(--space-2xs) var(--space-xs);
  }

  .about-hero__title-line {
    font-size: clamp(1.5rem, 7vw, 2rem);
  }

  .about-hero__lead {
    font-size: var(--font-size-sm);
    line-height: 1.75;
  }

  .about-hero__stats {
    gap: var(--space-sm);
  }

  .about-hero__stat {
    min-width: 70px;
    padding: var(--space-xs) var(--space-sm);
  }

  .about-hero__stat-number {
    font-size: var(--font-size-xl);
  }

  .about-hero__stat-label {
    font-size: 9px;
  }

  /* Profile - Extra small */
  .about-profile__grid {
    gap: var(--space-lg);
  }

  .about-profile__card-header {
    padding: var(--space-sm) var(--space-md);
  }

  .about-profile__card-dot {
    width: 10px;
    height: 10px;
  }

  .about-profile__card-content {
    padding: var(--space-sm);
  }

  .about-profile__code {
    font-size: 11px;
    line-height: 1.7;
  }

  .about-profile__bio p {
    font-size: var(--font-size-sm);
    line-height: 1.8;
  }

  .about-section__title {
    font-size: var(--font-size-lg);
  }

  /* Timeline - Extra small */
  .about-career__header {
    margin-bottom: var(--space-lg);
  }

  .about-career__lead {
    font-size: var(--font-size-sm);
    line-height: 1.7;
  }

  .about-timeline {
    padding-left: var(--space-lg);
  }

  .about-timeline__content {
    padding: var(--space-md);
    padding-left: calc(var(--space-md) + 3px);
  }

  .about-timeline__title {
    font-size: var(--font-size-base);
    margin-bottom: var(--space-xs);
  }

  .about-timeline__text {
    font-size: var(--font-size-sm);
    line-height: 1.7;
    margin-bottom: var(--space-sm);
  }

  .about-timeline__tag {
    font-size: 10px;
    padding: 2px var(--space-xs);
  }

  /* Skills - Stack vertically on extra small */
  .about-skills__category {
    flex-direction: column;
    gap: var(--space-sm);
    padding: var(--space-md);
  }

  .about-skills__category-icon {
    width: 44px;
    height: 44px;
  }

  .about-skills__category-icon svg {
    width: 22px;
    height: 22px;
  }

  .about-skills__category-title {
    font-size: var(--font-size-base);
  }

  .about-skills__category-text {
    font-size: var(--font-size-xs);
    line-height: 1.6;
  }

  /* Tech - Extra small */
  .about-tech__group {
    padding: var(--space-md);
  }

  .about-tech__group-title {
    font-size: var(--font-size-sm);
  }

  .about-tech__group-icon {
    width: 32px;
    height: 32px;
  }

  .about-tech__tag {
    font-size: 11px;
    padding: 3px var(--space-xs);
  }

  /* Values - Extra small */
  .about-values__item {
    padding: var(--space-md);
  }

  .about-values__number {
    font-size: 1.5rem;
  }

  .about-values__item-title {
    font-size: var(--font-size-base);
  }

  .about-values__item-text {
    font-size: var(--font-size-xs);
    line-height: 1.7;
  }

  /* CTA - Extra small */
  .about-cta__inner {
    padding: var(--space-lg) var(--space-md);
  }

  .about-cta__title {
    font-size: var(--font-size-lg);
  }

  .about-cta__text {
    font-size: var(--font-size-sm);
    line-height: 1.7;
  }

  .about-cta__button {
    font-size: var(--font-size-sm);
    padding: var(--space-sm) var(--space-md);
  }
}

/* Extra small phones (360px and below) */
@media (max-width: 360px) {
  .about-hero__title-line {
    font-size: 1.375rem;
  }

  .about-hero__stats {
    flex-direction: column;
    align-items: stretch;
  }

  .about-hero__stat {
    width: 100%;
    text-align: center;
  }

  .about-profile__code {
    font-size: 10px;
  }

  .about-timeline__year,
  .about-timeline__year span {
    font-size: 10px;
    padding: 2px var(--space-xs);
  }

  .about-skills__category {
    padding: var(--space-sm);
  }

  .about-tech__tag {
    font-size: 10px;
  }

  .about-values__item {
    padding: var(--space-sm);
  }

  .about-values__number {
    font-size: 1.25rem;
  }

  .about-cta__title {
    font-size: var(--font-size-base);
  }
}