:root {
  --bg: #f4f7f6;
  --text: #171717;
  --muted: #66706d;
  --line: #d5dedc;
  --card: #ffffff;
  --accent: #0f766e;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 16% 0%, rgba(15,118,110,.16), transparent 32%),
    radial-gradient(circle at 86% 10%, rgba(37,99,235,.12), transparent 28%),
    linear-gradient(180deg, #fbfefd 0%, var(--bg) 48%, #e8efed 100%);
  color: var(--text);
  font-family: "Inter", "Noto Serif JP", serif;
}

a { color: inherit; text-decoration: none; }

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 5vw;
  backdrop-filter: blur(14px);
}
.logo {
  font-weight: 900;
  letter-spacing: -.04em;
  font-size: 22px;
}
.nav {
  display: flex;
  gap: 22px;
  font-size: 13px;
  font-weight: 700;
}
.nav a { position: relative; }
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 1px;
  background: var(--text);
  transition: width .3s ease;
}
.nav a:hover::after { width: 100%; }
.menu-button { display: none; }

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 100px 5vw 40px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 18vh 5vw auto auto;
  width: min(36vw, 520px);
  height: min(36vw, 520px);
  border: 1px solid var(--line);
  border-radius: 50%;
  opacity: .9;
}
.eyebrow, .section-label, .work-type {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .18em;
  color: var(--muted);
  font-weight: 800;
}
.hero-title {
  margin: 20px 0 16px;
  font-size: clamp(74px, 16vw, 220px);
  line-height: .82;
  letter-spacing: -.09em;
  font-weight: 900;
}
.hero-title span { display: block; }
.hero-subtitle {
  font-size: clamp(18px, 2.5vw, 32px);
  font-family: "Noto Serif JP", serif;
  color: #24312f;
}
.scroll-indicator {
  position: absolute;
  bottom: 34px;
  left: 5vw;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}
.scroll-indicator span {
  width: 38px;
  height: 1px;
  background: var(--muted);
  animation: scrollLine 1.5s infinite;
}
@keyframes scrollLine { 0%,100% { transform: scaleX(.35); transform-origin: left; } 50% { transform: scaleX(1); } }

.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 120px 5vw;
  border-top: 1px solid var(--line);
}
.section h2 {
  margin: 10px 0 42px;
  font-size: clamp(34px, 6vw, 76px);
  line-height: .95;
  letter-spacing: -.06em;
}

.about-card {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 54px;
  align-items: center;
  padding: 42px;
  background: rgba(255,255,255,.76);
  border: 1px solid var(--line);
}
.avatar {
  aspect-ratio: 1;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #171717, #0f766e);
  color: #fff;
  font-size: 92px;
  font-weight: 900;
}
.tagline {
  font-family: "Noto Serif JP", serif;
  font-size: 22px;
  line-height: 1.9;
  margin-top: 0;
}
.profile-list { margin: 0; }
.profile-list div {
  display: grid;
  grid-template-columns: 120px 1fr;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}
dt { color: var(--muted); font-weight: 800; }
dd { margin: 0; }

.work-category {
  margin-top: 54px;
}
.work-category:first-of-type {
  margin-top: 0;
}
.category-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
}
.category-heading h3 {
  margin: 0;
  font-size: clamp(26px, 4vw, 46px);
  letter-spacing: -.04em;
}
.works-list { border-top: 1px solid var(--line); }
.work-item {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  gap: 30px;
  align-items: center;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}
.work-number {
  font-size: 42px;
  font-weight: 900;
  letter-spacing: -.07em;
}
.work-item h3 { margin: 8px 0; font-size: 28px; }
.work-item p { color: var(--muted); line-height: 1.7; }
.work-status {
  display: inline-block;
  margin: 4px 0 8px;
  padding: 7px 10px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.72);
  color: #24312f;
  font-size: 13px;
  font-weight: 800;
}
.work-meta {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
}
.work-meta div {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 14px;
  padding-top: 10px;
  border-top: 1px solid rgba(213, 222, 220, .82);
}
.work-meta dt {
  font-size: 13px;
}
.work-meta dd {
  line-height: 1.7;
  color: #24312f;
}
.document-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}
.document-links a {
  border: 1px solid var(--line);
  background: rgba(255,255,255,.82);
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 800;
  transition: transform .25s ease, background .25s ease, border-color .25s ease;
}
.document-links a:hover {
  transform: translateY(-2px);
  background: #fff;
  border-color: var(--accent);
}
.project-hero {
  min-height: 72vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 1180px;
  margin: 0 auto;
  padding: 130px 5vw 70px;
}
.project-hero h1 {
  max-width: 980px;
  margin: 18px 0;
  font-size: clamp(48px, 9vw, 116px);
  line-height: .95;
  letter-spacing: -.07em;
}
.project-hero p:not(.eyebrow) {
  max-width: 720px;
  color: #24312f;
  font-family: "Noto Serif JP", serif;
  font-size: clamp(18px, 2.4vw, 28px);
  line-height: 1.75;
}
.project-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}
.project-actions a,
.pdf-toolbar a {
  border: 1px solid var(--text);
  background: var(--text);
  color: #fff;
  padding: 11px 16px;
  font-size: 13px;
  font-weight: 800;
  transition: transform .25s ease, background .25s ease;
}
.project-actions a:hover,
.pdf-toolbar a:hover {
  transform: translateY(-2px);
  background: var(--accent);
}
.document-section {
  padding-top: 92px;
}
.pdf-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: -18px 0 18px;
}
.pdf-toolbar p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}
.pdf-viewer {
  display: block;
  width: 100%;
  height: min(78vh, 860px);
  min-height: 560px;
  border: 1px solid var(--line);
  background: #fff;
}
.project-summary {
  max-width: 860px;
}
.project-summary p {
  color: #24312f;
  font-family: "Noto Serif JP", serif;
  font-size: 19px;
  line-height: 1.9;
}
.project-meta {
  max-width: 940px;
  margin-top: 30px;
}
.artifact-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.artifact-list a {
  min-height: 220px;
  padding: 24px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.76);
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: transform .3s ease, background .3s ease, border-color .3s ease;
}
.artifact-list a:hover {
  transform: translateY(-6px);
  background: #fff;
  border-color: var(--accent);
}
.artifact-list span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}
.artifact-list strong {
  font-size: 22px;
  line-height: 1.35;
}
.artifact-list small {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}
.code-block {
  margin: 0;
  padding: 26px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.82);
  color: #24312f;
  overflow-x: auto;
  line-height: 1.7;
}
.chips { list-style: none; display: flex; gap: 8px; flex-wrap: wrap; padding: 0; margin: 0; justify-content: flex-end; }
.chips li {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 12px;
  font-weight: 700;
}

.skill-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.skill-group {
  padding: 30px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.72);
}
.skill-group h3 { margin-top: 0; font-size: 22px; }
.skill { margin: 22px 0; }
.skill span {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
  font-weight: 700;
}
.skill span::after { content: var(--level); color: var(--muted); }
.skill b {
  display: block;
  width: 100%;
  height: 8px;
  background: #dce5e2;
  position: relative;
  overflow: hidden;
}
.skill b::after {
  content: "";
  display: block;
  width: var(--level);
  height: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 1s ease;
}
.section-reveal.is-visible .skill b::after { transform: scaleX(1); }

.cert-list { display: grid; gap: 14px; }
.cert-list article {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 20px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}
.cert-list span { font-size: 28px; font-weight: 900; }
.cert-list h3 { margin: 0 0 8px; font-size: 24px; }
.cert-list p { margin: 0; color: var(--muted); }

.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.article-grid a {
  min-height: 210px;
  padding: 24px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.76);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform .3s ease, background .3s ease;
}
.article-grid a:hover { transform: translateY(-6px); background: #fff; }
time { color: var(--muted); font-size: 13px; font-weight: 700; }
.article-grid strong { font-size: 22px; line-height: 1.5; }
.article-grid span { font-size: 24px; }

.contact p { color: var(--muted); font-size: 18px; }
.contact-links {
  display: grid;
  gap: 18px;
  align-items: start;
  margin-top: 24px;
}
.contact-link {
  display: inline-block;
  width: fit-content;
  max-width: 100%;
  font-size: clamp(24px, 5vw, 58px);
  font-weight: 900;
  letter-spacing: -.03em;
  border-bottom: 3px solid var(--text);
  overflow-wrap: anywhere;
}
.footer {
  display: flex;
  justify-content: space-between;
  padding: 34px 5vw;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.section-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .75s ease, transform .75s ease;
}
.section-reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 900px) {
  .nav { display: none; }
  .menu-button {
    display: block;
    border: 1px solid var(--line);
    background: rgba(255,255,255,.72);
    padding: 9px 14px;
    border-radius: 999px;
    font-weight: 800;
  }
  .about-card, .work-item, .skill-grid, .article-grid, .artifact-list { grid-template-columns: 1fr; }
  .avatar { max-width: 220px; }
  .work-item { align-items: start; }
  .category-heading {
    display: block;
  }
  .category-heading .work-type {
    margin-bottom: 8px;
  }
  .project-hero {
    min-height: auto;
    padding-top: 112px;
  }
  .pdf-toolbar {
    display: block;
  }
  .pdf-toolbar a {
    display: inline-block;
    margin-top: 14px;
  }
  .pdf-viewer {
    height: 72vh;
    min-height: 420px;
  }
  .work-meta div { grid-template-columns: 1fr; gap: 4px; }
  .chips { justify-content: flex-start; }
  .section { padding: 86px 5vw; }
}