/* ============================================================
   Shiro Matsumoto — profile
   "Data-driven editorial": serif display + mono accents,
   ink-navy dark base with a single amber signal accent.
   ============================================================ */

:root {
  --bg:        #0d1014;
  --bg-2:      #12161c;
  --surface:   #161b22;
  --surface-2: #1c222b;
  --line:      #262d38;
  --line-soft: #1e242d;
  --text:      #e9eef4;
  --muted:     #9aa6b4;
  --faint:     #6b7686;
  --accent:    #f2b441;
  --accent-2:  #ffd27d;
  --accent-ink:#1a1206;
  /* accent tuned for small TEXT (>=4.5:1 on bg); see light override */
  --accent-text: #f2b441;

  --serif: 'Fraunces', Georgia, 'Times New Roman', serif;
  --sans:  'Public Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono:  'JetBrains Mono', ui-monospace, 'SFMono-Regular', monospace;

  --maxw: 860px;
  --r: 14px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg:        #f4f1ea;
    --bg-2:      #efebe2;
    --surface:   #fffdf8;
    --surface-2: #faf7f0;
    --line:      #e0d9c9;
    --line-soft: #ebe5d8;
    --text:      #1c1a16;
    --muted:     #5d5648;
    --faint:     #938b79;
    --accent:    #b9791a;
    --accent-2:  #8a5a10;
    --accent-ink:#fffaf0;
    /* darker amber for small label/link text: ~5.5:1 on paper bg */
    --accent-text: #8a5410;
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  overflow-x: clip;
  overflow-y: scroll;
  scrollbar-gutter: stable;
}

body {
  margin: 0;
  font-family: var(--sans);
  overflow-x: clip;
  background-color: var(--bg);
  background-image:
    radial-gradient(1100px 540px at 80% -8%, color-mix(in srgb, var(--accent) 11%, transparent), transparent 60%),
    radial-gradient(900px 600px at -5% 8%, color-mix(in srgb, var(--accent) 7%, transparent), transparent 55%),
    linear-gradient(180deg, var(--bg-2), var(--bg));
  background-attachment: fixed;
  color: var(--text);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* subtle film grain overlay */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: .035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.page {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(28px, 6vw, 72px) clamp(20px, 5vw, 40px) 96px;
}

.skip-link {
  position: absolute;
  inset-block-start: 10px;
  inset-inline-start: 10px;
  z-index: 20;
  transform: translateY(-140%);
  padding: 8px 12px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--mono);
  font-size: .78rem;
}
.skip-link:focus-visible { transform: none; }

.sitebar {
  position: sticky;
  top: 0;
  z-index: 10;
  width: 100%;
  padding-block: 16px 14px;
  padding-inline: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--line-soft);
  backdrop-filter: blur(16px);
}
.sitebar__inner {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-inline: clamp(20px, 5vw, 40px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.sitebar__brand {
  min-block-size: 32px;
  display: inline-flex;
  align-items: center;
  color: var(--text);
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1rem;
  white-space: nowrap;
}
.sitebar__nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 4px;
}
.sitebar__nav a {
  min-block-size: 32px;
  display: inline-flex;
  align-items: center;
  padding: 5px 9px;
  border-radius: 8px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: .72rem;
}
.sitebar__brand:hover { color: var(--accent-text); }
.sitebar__nav a:hover,
.sitebar__nav a[aria-current="page"] {
  color: var(--accent-text);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}

/* ---------- generic typography ---------- */

a {
  color: var(--text);
  text-decoration: none;
  text-underline-offset: 3px;
  text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent);
  transition: color .18s ease;
}
.section-body a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
}
.section-body a:hover { color: var(--accent-text); }

strong { font-weight: 600; color: var(--text); }

/* ====================================================
   HERO
   ==================================================== */
.hero {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(20px, 4vw, 38px);
  align-items: center;
}
.hero--home {
  grid-template-columns: 1fr;
  max-width: 720px;
}

.hero__photo {
  position: relative;
  width: clamp(112px, 22vw, 156px);
  aspect-ratio: 1;
}
.hero__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 20px;
  border: 1px solid var(--line);
  box-shadow: 0 18px 40px -18px rgba(0,0,0,.6);
  filter: saturate(1.02);
  transition: transform .4s cubic-bezier(.2,.8,.2,1), box-shadow .4s ease;
}
.hero__photo::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 21px;
  background: linear-gradient(150deg, color-mix(in srgb, var(--accent) 60%, transparent), transparent 45%);
  z-index: -1;
  filter: blur(14px);
  opacity: .7;
}
.hero__photo:hover img { transform: translateY(-4px) scale(1.02); }

.hero__eyebrow {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--accent-text);
  margin: 0 0 .5rem;
}
.hero__name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.1rem, 7vw, 3.4rem);
  line-height: .98;
  letter-spacing: -.02em;
  margin: 0;
}
.hero__role {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.05rem, 3vw, 1.32rem);
  color: var(--muted);
  margin: .45rem 0 0;
}
.hero__intro {
  margin: 1rem 0 0;
  max-width: 52ch;
  color: var(--muted);
  font-size: .98rem;
}
.hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 1.15rem;
}
.locchip {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--faint);
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
.locchip::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 70%, transparent);
  animation: pulse 2.6s ease-out infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 60%, transparent); }
  70%  { box-shadow: 0 0 0 8px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

.social { display: inline-flex; gap: 6px; }
.social a {
  width: 34px; height: 34px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 60%, transparent);
  color: var(--muted);
  transition: transform .2s ease, color .2s ease, border-color .2s ease, background .2s ease;
}
.social a:hover {
  color: var(--accent-ink);
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-3px);
}
.social svg { width: 17px; height: 17px; display: block; }
/* ====================================================
   HUB PAGES
   ==================================================== */
.pagelead {
  max-width: 760px;
}
.pagelead .hero__name {
  margin-block: 0 .8rem;
}

.home-links {
  display: grid;
  margin-top: clamp(34px, 7vw, 64px);
  border-block: 1px solid var(--line-soft);
}
.home-link {
  display: grid;
  grid-template-columns: minmax(96px, 140px) 1fr;
  gap: 18px;
  padding-block: 18px;
  color: var(--muted);
  text-decoration: none;
}
.home-link + .home-link {
  border-top: 1px solid var(--line-soft);
}
.home-link__label {
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.15rem;
  line-height: 1.25;
}
.home-link__text {
  max-width: 58ch;
  font-size: .94rem;
}
.home-link:hover .home-link__label,
.home-link:hover .home-link__text {
  color: var(--accent-text);
}
.lang-pill {
  display: inline-flex;
  align-items: center;
  min-block-size: 24px;
  padding: 2px 8px;
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--line));
  border-radius: 999px;
  color: var(--accent-text);
  font-family: var(--mono);
  font-size: .72rem;
  vertical-align: baseline;
}
.project-grid {
  display: grid;
  gap: 16px;
}
.project-card,
.article-card {
  min-inline-size: 0;
  position: relative;
  display: grid;
  gap: 12px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  color: var(--muted);
  overflow: hidden;
  text-decoration: none;
  transition: transform .22s ease, border-color .22s ease, background .22s ease;
}
.project-card::after,
.article-card::after {
  content: "→";
  position: absolute;
  inset-inline-end: 18px;
  inset-block-end: 12px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: .86rem;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity .22s ease, transform .22s ease;
}
.project-card:hover,
.article-card:hover {
  color: var(--muted);
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 48%, var(--line));
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface) 82%, var(--accent)), var(--surface-2));
}
.project-card:hover::after,
.article-card:hover::after {
  opacity: 1;
  transform: translateX(0);
}
.project-card__meta {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
}
.project-card__kind,
.article-card__source {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.project-card__kind,
.article-card__source {
  color: var(--faint);
}
.project-card h2,
.article-card h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.18rem, 3vw, 1.45rem);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--text);
}
.project-card__body {
  display: grid;
  gap: 8px;
}
.project-card__body p,
.article-card p {
  margin: 0;
  color: var(--muted);
  font-size: .95rem;
}
.article-group {
  margin-top: clamp(30px, 5vw, 46px);
}
.content-group__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 14px;
}
.content-group__head h2 {
  margin: 0;
  color: var(--text);
  font-family: var(--serif);
  font-size: clamp(1.22rem, 3vw, 1.55rem);
  line-height: 1.2;
}
.source-link {
  color: var(--accent-text);
  font-family: var(--mono);
  font-size: .72rem;
  text-decoration: none;
  white-space: nowrap;
}
.source-link:hover {
  color: var(--accent-2);
}
.article-grid {
  display: grid;
  gap: 16px;
}
.article-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.article-card__when {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.article-card__date {
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .04em;
  color: var(--faint);
  white-space: nowrap;
}
/* keep the lowercase "note" brand un-uppercased */
.article-card__source--brand {
  text-transform: none;
  letter-spacing: .02em;
}

/* ====================================================
   STAT BAND
   ==================================================== */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: clamp(34px, 6vw, 52px);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r);
  overflow: hidden;
}
.stat {
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  padding: 20px 18px;
  backdrop-filter: blur(4px);
}
.stat__num {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.5rem, 4.4vw, 2.1rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--text);
}
.stat__num span { color: var(--accent); }
.stat__label {
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--faint);
  margin-top: .55rem;
}

/* ====================================================
   SECTIONS
   ==================================================== */
.section { margin-top: clamp(44px, 8vw, 76px); }

.section__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 1.4rem;
  padding-bottom: .9rem;
  border-bottom: 1px solid var(--line);
}
.section__no {
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--accent-text);
  letter-spacing: .05em;
}
.section__title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.4rem, 3.6vw, 1.85rem);
  letter-spacing: -.01em;
  margin: 0;
}

.section-body { color: var(--muted); }

/* Markdown-authored content (e.g. Now page) inherits the design system */
.section-body h2,
.section-body h3 {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--text);
  letter-spacing: -.01em;
  line-height: 1.2;
}
.section-body h2 { font-size: clamp(1.3rem, 3.4vw, 1.7rem); margin: 1.9rem 0 .6rem; }
.section-body h3 { font-size: 1.2rem; margin: 1.5rem 0 .5rem; }
.section-body > :first-child { margin-top: 0; }
.section-body p { color: var(--muted); }

/* --- achievement cards --- */
.cards { display: grid; gap: 14px; }
.card {
  position: relative;
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 20px 22px 20px 24px;
  overflow: hidden;
  transition: transform .25s ease, border-color .25s ease;
}
.card::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(var(--accent), color-mix(in srgb, var(--accent) 20%, transparent));
}
.card__tag {
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent-text);
  display: block;
  margin-bottom: .4rem;
}
.card p { margin: 0; color: var(--muted); font-size: .96rem; }
.card p b { color: var(--text); font-weight: 600; }

/* --- timeline --- */
.timeline { position: relative; margin-left: 6px; }
.tl {
  position: relative;
  padding: 0 0 1.5rem 28px;
  border-left: 1px solid var(--line);
}
.tl:last-child { padding-bottom: 0; }
.tl::before {
  content: "";
  position: absolute;
  left: -5px; top: 6px;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.tl.tl--now::before { background: var(--accent); box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 22%, transparent); }
.tl__period {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--accent-text);
}
.tl__role { color: var(--text); font-weight: 600; margin: 2px 0 0; }
.tl__org { color: var(--faint); font-size: .9rem; }

/* --- skill groups & tags --- */
.skillset { display: grid; gap: 20px; }
.skillgrp__label {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: .7rem;
}
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: .85rem;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 55%, transparent);
  color: var(--text);
  transition: border-color .2s ease, color .2s ease;
}
.tag:hover { border-color: var(--accent); color: var(--accent-text); }
.tag em {
  font-style: normal;
  font-family: var(--mono);
  font-size: .76em;
  color: var(--faint);
  margin-left: 6px;
}
.tag--strong { border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); }

/* --- plain lists (personality, languages, etc.) --- */
.list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.list li {
  position: relative;
  padding-left: 22px;
  color: var(--muted);
}
.list li::before {
  content: "›";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-family: var(--mono);
}

/* --- link list (certs / patents) --- */
.linklist { list-style: none; padding: 0; margin: 0; display: grid; gap: 2px; }
.linklist a, .linklist .nolink {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--line-soft);
  text-decoration: none;
  color: var(--text);
  transition: padding-left .2s ease, color .2s ease;
}
.linklist a:hover { padding-left: 10px; color: var(--accent-text); }
.linklist .arr { color: var(--accent); font-family: var(--mono); font-size: .85rem; }
.linklist .nolink { color: var(--muted); }
.linklist--tight a, .linklist--tight .nolink { padding: 8px 4px; }
.note { font-size: .85rem; color: var(--faint); margin: 0 0 .9rem; }

/* section overview / lead paragraph under a heading */
.lead {
  margin: -.2rem 0 1rem;
  max-width: 64ch;
  color: var(--muted);
  font-size: 1rem;
}
.lead + .note { margin-top: -.4rem; }

/* two-up grid for short sections */
.duo { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 6vw, 56px); }

/* footer */
.foot {
  margin-top: clamp(50px, 9vw, 84px);
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--mono);
  font-size: .72rem;
  color: var(--faint);
  letter-spacing: .03em;
}

/* ====================================================
   RESPONSIVE
   ==================================================== */
@media (max-width: 680px) {
  .sitebar__inner {
    align-items: flex-start;
    flex-direction: column;
  }
  .sitebar__nav { justify-content: flex-start; }
  .hero { grid-template-columns: 1fr; text-align: left; }
  .home-link {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .stats { grid-template-columns: 1fr 1fr; }
  .duo { grid-template-columns: 1fr; }
}
@media (max-width: 380px) {
  .stats { grid-template-columns: 1fr; }
}

/* ====================================================
   ENTRANCE MOTION
   ==================================================== */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(16px);
    animation: rise .7s cubic-bezier(.2,.8,.2,1) forwards;
  }
  .reveal:nth-child(1) { animation-delay: .05s; }
  .reveal:nth-child(2) { animation-delay: .14s; }
  .reveal:nth-child(3) { animation-delay: .23s; }
  .reveal:nth-child(4) { animation-delay: .32s; }
  .reveal:nth-child(5) { animation-delay: .41s; }
  .reveal:nth-child(6) { animation-delay: .50s; }
  .reveal:nth-child(7) { animation-delay: .59s; }
  .reveal:nth-child(8) { animation-delay: .68s; }
  .reveal:nth-child(9) { animation-delay: .77s; }
  .reveal:nth-child(10){ animation-delay: .86s; }
}
@keyframes rise {
  to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

/* keyboard focus */
a:focus-visible, .social a:focus-visible, .sitebar__nav a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}