/* ============================================
   Kenshin Portfolio — Apple-Inspired Design System
   ============================================ */

/* ——— CSS Variables ——— */
:root {
  --bg-primary: #FBFBFD;
  --bg-secondary: #FFFFFF;
  --bg-tertiary: #F5F5F7;
  --text-primary: #1D1D1F;
  --text-secondary: #6E6E73;
  --text-tertiary: #AEAEB2;
  --accent-blue: #0071E3;
  --accent-blue-hover: #0077ED;
  --accent-red: #C41E3A;
  --accent-red-hover: #D42C48;
  --border-light: rgba(0,0,0,0.06);
  --border-medium: rgba(0,0,0,0.10);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.04), 0 2px 6px rgba(0,0,0,0.04);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.06), 0 8px 20px rgba(0,0,0,0.04);
  --shadow-xl: 0 32px 80px rgba(0,0,0,0.08), 0 12px 32px rgba(0,0,0,0.04);
  --radius-sm: 12px;
  --radius-md: 18px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;
  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
  --font-jp: "Noto Serif JP", "Hiragino Mincho ProN", serif;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --nav-height: 52px;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 17px;
  letter-spacing: -0.011em;
  overflow-x: hidden;
}

/* ——— Selection ——— */
::selection {
  background: var(--accent-blue);
  color: white;
}

/* ——— Focus ——— */
:focus-visible {
  outline: 3px solid var(--accent-blue);
  outline-offset: 4px;
  border-radius: 8px;
}

/* ——— Typography ——— */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.022em;
  line-height: 1.15;
}

h1 { font-size: clamp(3rem, 7vw, 5.5rem); }
h2 { font-size: clamp(2rem, 4.5vw, 3.5rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.75rem); }

p {
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ——— Navigation ——— */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 12px 0;
  transition: all 0.5s var(--ease-out-expo);
}

.nav--scrolled {
  background: rgba(251, 251, 253, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-light);
}

.nav__inner {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  transition: opacity 0.3s ease;
}

.nav__logo:hover { opacity: 0.7; }

.nav__logo-mark {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-red);
  margin-right: 8px;
  vertical-align: middle;
  margin-top: -2px;
}

.nav__links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav__link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: color 0.3s ease;
  position: relative;
}

.nav__link:hover { color: var(--text-primary); }

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-blue);
  border-radius: 1px;
  transition: width 0.3s var(--ease-out-expo);
}

.nav__link:hover::after { width: 100%; }

/* ——— Section ——— */
.section {
  padding: 120px 24px;
  max-width: 1024px;
  margin: 0 auto;
}

.section--hero {
  padding-top: 200px;
  padding-bottom: 80px;
}

.section__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-blue);
  margin-bottom: 24px;
}

.section__label::before {
  content: '';
  display: block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-blue);
}

.section__title {
  margin-bottom: 20px;
}

.section__subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--text-secondary);
  max-width: 600px;
}

/* ——— Hero ——— */
.hero__name {
  font-size: clamp(3.5rem, 8vw, 6.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 0.95;
  margin-bottom: 16px;
}

.hero__name-accent {
  color: var(--accent-red);
  display: inline;
}

.hero__jp {
  font-family: var(--font-jp);
  font-size: clamp(2rem, 5vw, 4rem);
  color: var(--text-tertiary);
  opacity: 0.3;
  margin-bottom: 24px;
  font-weight: 400;
  letter-spacing: 0.05em;
}

.hero__title {
  font-size: clamp(1.2rem, 2.2vw, 1.6rem);
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: -0.01em;
  margin-bottom: 12px;
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 32px;
}

.hero__tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  transition: all 0.35s var(--ease-out-expo);
}

.hero__tag:hover {
  background: var(--bg-secondary);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.hero__tag--primary {
  background: var(--accent-blue);
  color: white;
  border-color: var(--accent-blue);
}

.hero__tag--primary:hover {
  background: var(--accent-blue-hover);
  border-color: var(--accent-blue-hover);
}

/* ——— Bento Grid ——— */
.bento {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
}

.bento__item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 0.5s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}

.bento__item:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--border-medium);
  transform: translateY(-3px);
}

.bento__item--span-4 { grid-column: span 4; }
.bento__item--span-6 { grid-column: span 6; }
.bento__item--span-8 { grid-column: span 8; }
.bento__item--span-12 { grid-column: span 12; }

.bento__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 18px;
}

.bento__icon--blue { background: #E8F4FD; color: var(--accent-blue); }
.bento__icon--red { background: #FDE8EC; color: var(--accent-red); }
.bento__icon--green { background: #E8F8ED; color: #34C759; }
.bento__icon--purple { background: #F0E8FD; color: #AF52DE; }
.bento__icon--orange { background: #FDF0E8; color: #FF9500; }

.bento__title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.bento__desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ——— Skill Bars ——— */
.skill-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 12px;
}

.skill-item__name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
  display: flex;
  justify-content: space-between;
}

.skill-item__level {
  font-weight: 500;
  color: var(--text-tertiary);
}

.skill-item__bar {
  height: 5px;
  border-radius: 3px;
  background: var(--bg-tertiary);
  overflow: hidden;
}

.skill-item__fill {
  height: 100%;
  border-radius: 3px;
  background: var(--accent-blue);
  transform-origin: left;
  transition: transform 1.2s var(--ease-out-expo);
  transform: scaleX(0);
}

.skill-item__fill--visible {
  transform: scaleX(1);
}

/* ——— Industry Cards ——— */
.industry-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.industry-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 40px;
  transition: all 0.5s var(--ease-out-expo);
  position: relative;
  overflow: hidden;
}

.industry-card:hover {
  box-shadow: var(--shadow-xl);
  border-color: var(--border-medium);
  transform: translateY(-4px);
}

.industry-card__number {
  font-family: var(--font-display);
  font-size: 4rem;
  font-weight: 700;
  color: var(--bg-tertiary);
  position: absolute;
  top: 20px;
  right: 30px;
  line-height: 1;
  letter-spacing: -0.03em;
  transition: color 0.5s ease;
}

.industry-card:hover .industry-card__number {
  color: var(--accent-blue);
  opacity: 0.15;
}

.industry-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.industry-card__icon--social { background: #E8F4FD; }
.industry-card__icon--medical { background: #FDE8EC; }

.industry-card__title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.industry-card__desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.industry-card__items {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.industry-card__item {
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  letter-spacing: -0.005em;
}

/* ——— Agent Section ——— */
.agent-showcase {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: 48px;
  position: relative;
  overflow: hidden;
}

.agent-showcase::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,113,227,0.04) 0%, transparent 70%);
  pointer-events: none;
}

.agent-showcase__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 36px;
  position: relative;
  z-index: 1;
}

.agent-feature {
  text-align: left;
}

.agent-feature__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.agent-feature__title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: -0.015em;
}

.agent-feature__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ——— CTA ——— */
.cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  transition: all 0.35s var(--ease-spring);
  cursor: pointer;
  border: none;
  font-family: var(--font-body);
}

.cta--primary {
  background: var(--accent-blue);
  color: white;
}

.cta--primary:hover {
  background: var(--accent-blue-hover);
  transform: scale(1.03);
  box-shadow: 0 8px 24px rgba(0,113,227,0.3);
}

.cta--primary:active {
  transform: scale(0.97);
}

.cta--outline {
  background: transparent;
  color: var(--accent-blue);
  border: 1.5px solid var(--accent-blue);
}

.cta--outline:hover {
  background: var(--accent-blue);
  color: white;
  transform: scale(1.02);
}

.cta__arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(255,255,255,0.25);
  transition: transform 0.35s var(--ease-out-expo);
}

.cta:hover .cta__arrow {
  transform: translateX(3px);
}

/* ——— Footer ——— */
.footer {
  border-top: 1px solid var(--border-light);
  padding: 48px 24px 32px;
  text-align: center;
}

.footer__inner {
  max-width: 1024px;
  margin: 0 auto;
}

.footer__text {
  font-size: 14px;
  color: var(--text-tertiary);
  letter-spacing: -0.005em;
}

.footer__links {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}

.footer__link {
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer__link:hover { color: var(--accent-blue); }

/* ——— Scroll Reveal ——— */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

.reveal--visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }
.reveal--delay-4 { transition-delay: 0.4s; }

/* ——— Gradient Orb ——— */
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

.orb--blue {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0,113,227,0.15), transparent);
  top: -200px;
  right: -100px;
}

.orb--red {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(196,30,58,0.08), transparent);
  bottom: 10%;
  left: -150px;
}

/* ——— Responsive ——— */
@media (max-width: 768px) {
  .section {
    padding: 80px 20px;
  }
  
  .section--hero {
    padding-top: 140px;
    padding-bottom: 60px;
  }

  .nav__links { display: none; }

  .bento {
    grid-template-columns: 1fr;
  }
  
  .bento__item--span-4,
  .bento__item--span-6,
  .bento__item--span-8,
  .bento__item--span-12 {
    grid-column: span 1;
  }

  .industry-cards {
    grid-template-columns: 1fr;
  }

  .agent-showcase__grid {
    grid-template-columns: 1fr;
  }

  .agent-showcase {
    padding: 28px;
  }

  .industry-card {
    padding: 28px;
  }

  .hero__name {
    font-size: clamp(2.8rem, 10vw, 4rem);
  }
}

@media (max-width: 480px) {
  .hero__tags { gap: 8px; }
  .hero__tag { font-size: 13px; padding: 7px 14px; }
  .bento__item { padding: 24px; }
}