/* ==========================================================================
   Design tokens
   ========================================================================== */
:root {
  --color-bg: #ffffff;
  --color-surface: #f6f6f7;
  --color-border: #e5e5e8;
  --color-text: #16171a;
  --color-text-muted: #5c5f66;
  --color-accent: #b5502c;
  --color-accent-contrast: #ffffff;

  --font-sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP",
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --wrap-width: 1040px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;

  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 16, 20, 0.06), 0 8px 24px rgba(16, 16, 20, 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #101113;
    --color-surface: #1a1b1e;
    --color-border: #2a2b2f;
    --color-text: #eceded;
    --color-text-muted: #9a9ca3;
    --color-accent: #e08a5f;
    --color-accent-contrast: #101113;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

/* ==========================================================================
   Reset
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
p {
  margin: 0;
}

.wrap {
  max-width: var(--wrap-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

/* ==========================================================================
   Header / Nav
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  max-width: var(--wrap-width);
  margin: 0 auto;
  padding: var(--space-2) var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: inherit;
}

.brand:hover {
  text-decoration: none;
}

.brand__avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__name {
  font-weight: 600;
  font-size: 0.95rem;
}

.brand__loc {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.nav {
  display: flex;
  gap: var(--space-3);
}

.nav a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.nav a:hover {
  color: var(--color-text);
  text-decoration: none;
}

.nav a.is-active {
  color: var(--color-text);
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  padding: var(--space-6) 0 var(--space-5);
}

.hero__eyebrow {
  color: var(--color-accent);
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-1);
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-2);
}

.hero__lead {
  max-width: 44ch;
  color: var(--color-text-muted);
  font-size: 1.05rem;
  margin-bottom: var(--space-3);
}

.social {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.social a {
  display: inline-block;
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--color-text);
}

.social a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  text-decoration: none;
}

/* ==========================================================================
   Sections
   ========================================================================== */
.section {
  padding: var(--space-5) 0;
}

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

.section__title {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-4);
}

.about__text {
  max-width: 70ch;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Output & Qualification records
   ========================================================================== */
.records {
  display: grid;
  grid-template-columns: 180px 1fr;
  column-gap: var(--space-4);
}

.records dt {
  padding: var(--space-3) 0;
  font-weight: 600;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

.records dd {
  margin: 0;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border);
}

.records dt:last-of-type,
.records dd:last-of-type {
  border-bottom: none;
}

.records ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.records li {
  font-size: 0.95rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 0.6rem;
}

.records__label {
  color: var(--color-text);
  font-weight: 500;
}

.records__list--plain li {
  color: var(--color-text);
}

.records__list--flow {
  columns: 240px;
  column-gap: var(--space-4);
}

.records__list--flow li {
  break-inside: avoid;
  padding-bottom: var(--space-1);
}

/* ==========================================================================
   Portfolio
   ========================================================================== */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-3);
}

.project {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-bg);
  box-shadow: var(--shadow);
}

.project__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--color-surface);
}

.project__body {
  padding: var(--space-3);
}

.project__title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.project__subtitle {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: var(--space-2);
}

.project__details summary {
  cursor: pointer;
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: var(--space-1);
}

.project__details p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: var(--space-2);
}

.project__link {
  display: inline-block;
  font-weight: 600;
  font-size: 0.9rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-3);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 640px) {
  .site-header__inner {
    flex-wrap: wrap;
  }

  .nav {
    width: 100%;
    justify-content: center;
    gap: var(--space-2);
  }

  .hero {
    padding: var(--space-5) 0 var(--space-4);
  }

  .records {
    grid-template-columns: 1fr;
  }

  .records dt {
    padding-bottom: var(--space-1);
    border-bottom: none;
  }

  .records dd {
    padding-top: 0;
  }
}