/* ===========================================================
   Variant A — Formal
   Palette: warm cream / deep navy / muted gold
   Typography: Noto Serif JP (headings) + Noto Sans JP (body)
   =========================================================== */

:root {
  --color-bg: #f8f5ee;
  --color-bg-elev: #ffffff;
  --color-text: #1a2332;
  --color-text-soft: #4a5568;
  --color-meta: #9b9b94;
  --color-accent: #c9a96a;
  --color-accent-soft: #e6d5a8;
  --color-border: #e0d9c8;

  --font-serif: "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;
  --font-sans: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;

  --container: 760px;
  --gutter: 1.5rem;
  --radius: 2px;

  --shadow-sm: 0 1px 2px rgba(26, 35, 50, 0.04);
  --shadow-md: 0 4px 12px rgba(26, 35, 50, 0.06);

  --transition: 0.2s ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #161b22;
    --color-bg-elev: #1f2630;
    --color-text: #e8e6e0;
    --color-text-soft: #c8c6c0;
    --color-meta: #8a8a82;
    --color-accent: #c9a96a;
    --color-accent-soft: #6b5a3a;
    --color-border: #2d3540;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  }
}

/* ----------- reset ----------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; display: block; }
ul, ol { margin: 0; padding: 0; list-style: none; }
p { margin: 0 0 1rem; }

a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition), text-decoration-color var(--transition);
}
a:hover { color: var(--color-accent); text-decoration-thickness: 2px; }
a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius);
}

/* ----------- a11y utilities ----------- */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--color-text);
  color: var(--color-bg);
  text-decoration: none;
  z-index: 100;
  transition: top var(--transition);
}
.skip-link:focus { top: 0.5rem; color: var(--color-bg); }

/* ----------- layout ----------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg);
}
.site-header__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1.25rem var(--gutter);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
@media (min-width: 640px) {
  .site-header__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}
.site-header__brand {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.125rem;
  margin: 0;
  letter-spacing: 0.04em;
  color: var(--color-text);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
}
.site-nav__link {
  font-size: 0.9375rem;
  text-decoration: none;
  color: var(--color-text-soft);
  padding: 0.25rem 0;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.site-nav__link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--color-border);
}
.section:last-of-type { border-bottom: none; }
.section__heading {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.75rem;
  margin: 0 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-accent);
  display: inline-block;
  letter-spacing: 0.02em;
  color: var(--color-text);
}
.section__intro {
  color: var(--color-text-soft);
  margin-bottom: 2rem;
}

/* ----------- profile ----------- */
.profile {
  padding-top: 4rem;
}
.profile__head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.5rem;
}
@media (min-width: 640px) {
  .profile__head {
    flex-direction: row;
    align-items: center;
    gap: 2rem;
  }
}
.profile__avatar {
  width: 160px;
  height: 160px;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius);
  background-color: var(--color-bg-elev);
  flex-shrink: 0;
}
.profile__intro { min-width: 0; }
.profile__name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 2rem;
  line-height: 1.3;
  margin: 0 0 0.5rem;
  letter-spacing: 0.02em;
  color: var(--color-text);
}
.profile__name-en {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.125rem;
  color: var(--color-meta);
  margin-left: 0.25rem;
}
.profile__role {
  font-size: 0.9375rem;
  color: var(--color-accent);
  margin: 0 0 0.75rem;
  letter-spacing: 0.08em;
}
.profile__bio {
  color: var(--color-text-soft);
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
}

/* ----------- skills ----------- */
.skill-groups {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.skill-group__heading {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1rem;
  margin: 0 0 0.625rem;
  color: var(--color-text);
  letter-spacing: 0.04em;
}
.skill-group__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.skill-group__tag {
  font-size: 0.8125rem;
  padding: 0.3125rem 0.75rem;
  background-color: var(--color-bg-elev);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  letter-spacing: 0.02em;
}

/* ----------- works ----------- */
.work-list {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.work-card {
  background-color: var(--color-bg-elev);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}
.work-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}
.work-card__thumb-link {
  display: block;
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg);
}
.work-card__thumb-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: -2px;
}
.work-card__thumb {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.work-card__body {
  padding: 1.25rem 1.5rem 1.5rem;
}
.work-card__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.1875rem;
  margin: 0 0 0.5rem;
  letter-spacing: 0.02em;
  line-height: 1.5;
}
.work-card__title a {
  text-decoration: none;
  color: var(--color-text);
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}
.work-card__title a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}
.work-card__desc {
  margin: 0 0 0.75rem;
  font-size: 0.9375rem;
  color: var(--color-text-soft);
  line-height: 1.8;
}
.work-card__tech {
  margin: 0 0 0.75rem;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-meta);
  font-variant: small-caps;
}
.work-card__visit { margin: 0; font-size: 0.875rem; }
.work-card__visit a {
  text-decoration: none;
  color: var(--color-accent);
  font-weight: 400;
  border-bottom: 1px solid transparent;
}
.work-card__visit a:hover { border-bottom-color: var(--color-accent); }

/* ----------- links list ----------- */
.link-list {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}
.link-list__item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.75rem 0;
  border-bottom: 1px dotted var(--color-border);
}
.link-list__item:last-child { border-bottom: none; }
@media (min-width: 480px) {
  .link-list__item {
    flex-direction: row;
    align-items: baseline;
    gap: 1.25rem;
  }
}
.link-list__label {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-meta);
  letter-spacing: 0.06em;
  min-width: 7rem;
}
.link-list__link { font-size: 0.9375rem; }

/* ----------- footer ----------- */
.site-footer {
  margin-top: 3rem;
  padding: 2.5rem 0 3rem;
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
}
.site-footer__inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}
.site-footer__copyright {
  font-family: var(--font-serif);
  font-size: 0.875rem;
  color: var(--color-text);
  margin: 0;
  letter-spacing: 0.04em;
}
.site-footer__privacy,
.site-footer__trademark {
  font-size: 0.75rem;
  line-height: 1.7;
  color: var(--color-meta);
  margin: 0;
}

/* ----------- privacy page extras ----------- */
.legal { padding-top: 3rem; }
.legal__heading {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.5rem;
  margin: 2rem 0 0.75rem;
  color: var(--color-text);
}
.legal__updated {
  font-size: 0.8125rem;
  color: var(--color-meta);
  margin-bottom: 2rem;
}
.legal p { color: var(--color-text-soft); font-size: 0.9375rem; }
.legal ul {
  list-style: disc;
  padding-left: 1.5rem;
  margin: 0 0 1.25rem;
  color: var(--color-text-soft);
  font-size: 0.9375rem;
}
.legal ul li { margin-bottom: 0.5rem; }

/* ----------- 404 ----------- */
.notfound {
  padding: 5rem 0;
  text-align: center;
}
.notfound__code {
  font-family: var(--font-serif);
  font-size: 3.5rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: var(--color-accent);
  letter-spacing: 0.08em;
}
.notfound__message {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  color: var(--color-text);
  margin-bottom: 1.5rem;
}
.notfound__back a {
  font-size: 0.9375rem;
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}