/* ---------------------------------
   Toshimichi Homma Lab.
   Minimal static website
---------------------------------- */

:root {
  --bg: #f7f7f4;
  --text: #171717;
  --muted: #686868;
  --line: #d9d9d3;
  --accent: #183c34;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    "Hiragino Kaku Gothic ProN",
    "Hiragino Sans",
    "Yu Gothic",
    "YuGothic",
    "Noto Sans JP",
    sans-serif;
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: 0.01em;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.18;
  background-image: radial-gradient(rgba(0, 0, 0, 0.12) 0.7px, transparent 0.8px);
  background-size: 5px 5px;
  mix-blend-mode: multiply;
}

a {
  color: inherit;
}

.container {
  width: min(calc(100% - 48px), var(--max-width));
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(247, 247, 244, 0.94);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(10px);
  view-transition-name: site-header;
}

main {
  view-transition-name: main-content;
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.site-name {
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  gap: 28px;
}

.site-nav a {
  position: relative;
  text-decoration: none;
  color: var(--muted);
  font-size: 0.92rem;
  transition: color 0.2s ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -6px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.25s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--text);
}

.site-nav a:hover::after,
.site-nav a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.site-nav a:focus-visible,
.site-name:focus-visible,
.button:focus-visible,
.profile-link:focus-visible,
.card:is(a):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.eyebrow,
.side-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--accent);
  letter-spacing: 0.16em;
}

.hero-line {
  display: block;
  opacity: 0;
  transform: translateY(18px);
}

html.with-hero-motion .hero-line {
  animation: hero-fade-up 0.7s ease forwards;
}

html.with-hero-motion .hero-line:nth-child(2) {
  animation-delay: 0.08s;
}

@keyframes hero-fade-up {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

html.with-entry-motion .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

html.with-entry-motion .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

html.with-entry-motion .grid-three .card {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

html.with-entry-motion .grid-three .card:nth-child(2) {
  transition-delay: 0.08s;
}

html.with-entry-motion .grid-three .card:nth-child(3) {
  transition-delay: 0.16s;
}

html.with-entry-motion .reveal.is-visible .card {
  opacity: 1;
  transform: translateY(0);
}

html.skip-entry-motion .reveal,
html.skip-entry-motion .grid-three .card {
  opacity: 1;
  transform: none;
  animation: none;
  transition: none;
}

html.skip-entry-motion .hero-line {
  opacity: 0;
  transform: translateY(18px);
  animation: none;
}

@media (scripting: none) {
  .hero-line {
    opacity: 1;
    transform: none;
  }
}

.page-lead {
  max-width: 740px;
  margin: 20px 0 0;
  color: #4f4f4f;
  font-size: clamp(1.05rem, 2vw, 1.28rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 10px 18px;
  border: 1px solid var(--text);
  background: white;
  color: var(--text);
  text-decoration: none;
  font-size: 0.94rem;
  transition: transform 0.25s ease, background 0.18s ease, border-color 0.18s ease;
}

.button:hover {
  background: #f0f0ee;
  transform: translate(2px, -2px);
  box-shadow: -2px 2px 0 rgba(23, 23, 23, 0.12);
}

.section {
  padding-top: 32px;
  padding-bottom: 48px;
}

.section-muted {
  background: #ecece7;
}

.section-heading {
  margin-bottom: 16px;
}

.page-hero h1,
.section h2 {
  margin: 0;
  letter-spacing: -0.035em;
}

.page-hero h1 {
  max-width: 900px;
  font-size: clamp(2rem, 3.6vw, 3rem);
  line-height: 1.28;
  font-weight: 700;
}

.section h2 {
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  line-height: 1.28;
}

.grid-three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.card {
  padding: 18px 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.36);
  display: flex;
  flex-direction: column;
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.card:is(a) {
  text-decoration: none;
  color: inherit;
}

.card:is(a):hover {
  transform: translateY(-4px);
  border-color: rgba(24, 60, 52, 0.4);
  background: rgba(255, 255, 255, 0.72);
}

.index {
  color: var(--muted);
  font-size: 0.76rem;
}

.card h3 {
  margin: 10px 0 8px;
  font-size: 1.48rem;
}

.card p {
  color: #555;
  margin-top: 0;
}

.prose-contact p {
  max-width: 700px;
  color: var(--muted);
}

.page-hero {
  padding-top: 72px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--line);
}

.content-grid {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr);
  gap: 70px;
}

.side-label {
  color: var(--muted);
  letter-spacing: 0.14em;
}

.prose {
  max-width: 760px;
}

.prose h2 {
  margin-bottom: 34px;
}

.prose p {
  margin: 0 0 1.15em;
  color: #454545;
  font-size: 1.04rem;
}

.info-list {
  margin: 28px 0 40px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.interest .info-list:last-child {
  margin-bottom: 0;
}

.info-list li {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  color: #303030;
}

.info-list strong {
  font-weight: 700;
}

.interest {
  padding: 30px 0;
  border-top: 1px solid #cfcfc9;
}

.interest:last-child {
  border-bottom: 1px solid #cfcfc9;
}

.interest:has(> .info-list:last-child) {
  padding-bottom: 0;
  border-bottom: none;
}

.interest h3 {
  margin: 0 0 8px;
  font-size: 1.28rem;
}

.profile-links {
  display: grid;
  gap: 12px;
  margin-top: 34px;
}

.profile-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  text-decoration: none;
  transition: transform 0.25s ease;
}

.profile-link:last-child {
  border-bottom: 1px solid var(--line);
}

.profile-link:hover {
  transform: translate(2px, -2px);
}

.profile-link strong,
.profile-link small {
  display: block;
}

.profile-link small {
  margin-top: 4px;
  color: var(--muted);
}

.profile-link:hover strong {
  text-decoration: underline;
}

.principles {
  margin-top: 54px;
}

.principle {
  display: grid;
  grid-template-columns: 52px 230px minmax(0, 1fr);
  gap: 18px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.principle:last-child {
  border-bottom: 1px solid var(--line);
}

.principle span,
.principle h3,
.principle p {
  margin: 0;
}

.principle h3 {
  font-size: 1.02rem;
}

.principle p {
  font-size: 0.95rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: var(--muted);
  font-size: 0.82rem;
}

.footer-inner p {
  margin: 0;
}

@media (max-width: 860px) {
  .grid-three,
  .content-grid {
    grid-template-columns: 1fr;
  }

  .content-grid {
    gap: 36px;
  }

  .principle {
    grid-template-columns: 44px 1fr;
  }

  .principle p {
    grid-column: 2;
  }
}

@media (max-width: 600px) {
  .container {
    width: min(calc(100% - 30px), var(--max-width));
  }

  .header-inner {
    min-height: 64px;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    padding: 10px 0;
  }

  .site-nav {
    flex-wrap: wrap;
    gap: 14px 18px;
  }

  .site-nav a {
    font-size: 0.82rem;
  }

  .section {
    padding-top: 52px;
    padding-bottom: 52px;
  }

  .page-hero {
    padding-top: 56px;
    padding-bottom: 44px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 2px;
  }
}

/* ---------------------------------
   Cross-document View Transitions
---------------------------------- */

@media (prefers-reduced-motion: no-preference) {
  @view-transition {
    navigation: auto;
  }

  ::view-transition-old(main-content) {
    animation: vt-main-out 0.38s ease forwards;
  }

  ::view-transition-new(main-content) {
    animation: vt-main-in 0.38s ease forwards;
  }

  ::view-transition-old(site-header),
  ::view-transition-new(site-header) {
    animation-duration: 0.38s;
  }

  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation-duration: 0.38s;
  }
}

@media (prefers-reduced-motion: reduce) {
  @view-transition {
    navigation: none;
  }

  html.with-entry-motion .reveal,
  html.with-entry-motion .grid-three .card,
  .hero-line {
    opacity: 1;
    transform: none;
    animation: none;
    transition: none;
  }

  .site-nav a,
  .button,
  .profile-link,
  .card {
    transition: none;
    transform: none;
  }
}

@keyframes vt-main-out {
  from {
    opacity: 1;
    transform: translateY(0);
  }

  to {
    opacity: 0;
    transform: translateY(-10px);
  }
}

@keyframes vt-main-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }

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