/* ============================================
   nkjzm.github.io — design system
   editorial-minimalism × tech soul
   ============================================ */

:root {
  /* Tones */
  --bg: #F7F5F0;
  --bg-card: #FFFFFF;
  --bg-elevated: #FDFCF8;
  --fg: #1A1A1F;
  --fg-soft: #4A4A52;
  --fg-muted: #6B6B72;
  --fg-subtle: #9A9AA1;

  /* Accent: deep indigo, used sparingly */
  --accent: #312E81;
  --accent-strong: #1E1B4B;
  --accent-hot: #4F46E5;

  /* Lines */
  --border: #E5E2DA;
  --border-strong: #D4D1C7;

  /* Type stacks */
  --font-display: 'Instrument Serif', 'Noto Serif JP', Georgia, serif;
  --font-body: 'Manrope', 'Noto Sans JP', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  /* Layout */
  --max-width: 1240px;
  --gutter: clamp(20px, 5vw, 80px);

  /* Motion */
  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
}

/* ============================================
   Reset
   ============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; text-size-adjust: 100%; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
button { font: inherit; cursor: pointer; }
ul { list-style: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 2px; }

/* ============================================
   Base
   ============================================ */
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  font-weight: 400;
  font-feature-settings: 'palt' 1;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

/* Subtle film grain for warmth */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.035;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml;utf8,<svg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0'/></filter><rect width='200' height='200' filter='url(%23n)'/></svg>");
}

.page {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* ============================================
   Section pattern: marker | content
   ============================================ */
.section {
  padding: clamp(72px, 11vw, 144px) 0;
  border-top: 1px solid var(--border);
  position: relative;
}

.section__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}
@media (min-width: 880px) {
  .section__inner {
    grid-template-columns: 200px 1fr;
    gap: 80px;
  }
}

.marker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--fg-muted);
  text-transform: uppercase;
  align-self: start;
}
@media (min-width: 880px) {
  .marker { position: sticky; top: 32px; }
}
.marker__num {
  display: block;
  color: var(--accent);
  margin-bottom: 6px;
  font-weight: 500;
}
.marker__name {
  display: block;
  color: var(--fg);
  font-weight: 500;
}

.section__content { max-width: 780px; }

/* Section heading — for sub-page articles */
.heading-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--fg-muted);
  text-transform: uppercase;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.heading-eyebrow::before {
  content: '';
  width: 28px;
  height: 1px;
  background: var(--fg-muted);
}

/* ============================================
   Hero
   ============================================ */
.hero {
  padding: clamp(96px, 16vw, 200px) 0 clamp(72px, 12vw, 156px);
  position: relative;
}

.hero__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--fg-muted);
  text-transform: uppercase;
  margin-bottom: clamp(40px, 6vw, 72px);
  display: flex;
  align-items: center;
  gap: 14px;
}
.hero__label::before {
  content: '';
  width: 32px;
  height: 1px;
  background: var(--fg-muted);
}

.hero__name {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(64px, 14vw, 184px);
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: clamp(40px, 6vw, 72px);
}
.hero__name em {
  font-style: italic;
  color: var(--accent);
  font-weight: 400;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: clamp(16px, 3vw, 40px);
  border-top: 1px solid var(--border-strong);
  padding-top: 24px;
  max-width: 720px;
}

.hero__role {
  font-family: var(--font-body);
  font-size: clamp(13px, 1.4vw, 15px);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg);
}

.hero__sep {
  display: none;
  width: 1px;
  height: 16px;
  background: var(--border-strong);
}
@media (min-width: 640px) {
  .hero__sep { display: inline-block; }
}

.hero__location {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--fg-muted);
  text-transform: uppercase;
}

/* ============================================
   About
   ============================================ */
.about__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
  margin-bottom: 40px;
}
@media (min-width: 720px) {
  .about__head {
    grid-template-columns: 1fr 160px;
    gap: 48px;
  }
}

.about__lead {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.3;
  letter-spacing: -0.005em;
  color: var(--fg);
  margin: 0;
}
.about__lead em {
  font-style: italic;
  color: var(--accent);
}

.about__portrait {
  margin: 0;
  width: 140px;
  justify-self: start;
}
@media (min-width: 720px) {
  .about__portrait { width: 160px; justify-self: end; }
}
.about__portrait img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  background: var(--bg-card);
  box-shadow: 0 18px 36px -22px rgba(26, 26, 31, 0.18);
  display: block;
  image-rendering: -webkit-optimize-contrast;
}
.about__portrait figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--fg-muted);
  text-transform: uppercase;
  text-align: center;
}
@media (min-width: 720px) {
  .about__portrait figcaption { text-align: right; }
}

.about__body {
  font-size: 15px;
  line-height: 1.95;
  color: var(--fg-soft);
}
.about__body p + p { margin-top: 22px; }
.about__body strong { color: var(--fg); font-weight: 600; }

/* ============================================
   GitHub stats
   ============================================ */
.stats__intro {
  font-size: 15px;
  line-height: 1.85;
  color: var(--fg-soft);
  margin-bottom: 36px;
  max-width: 600px;
}

.stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 720px) {
  .stats { grid-template-columns: 1.2fr 1fr; }
  .stats__contrib { grid-column: 1 / -1; }
}

.stats__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  transition: border-color 0.4s var(--ease);
}
.stats__card:hover { border-color: var(--border-strong); }
.stats__card img { max-width: 100%; height: auto; border-radius: 2px; }
.stats__card--contrib { padding: 28px; min-height: 0; }

/* ============================================
   Featured project cards
   ============================================ */
.feat-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 880px) {
  .feat-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
}

.feat-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: clamp(36px, 6vw, 64px);
  text-decoration: none;
  color: inherit;
  position: relative;
  transition: border-color 0.4s var(--ease), transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
  overflow: hidden;
}
.feat-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 100% 0%, rgba(79, 70, 229, 0.04), transparent 50%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.5s var(--ease);
}
.feat-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: 0 24px 48px -28px rgba(49, 46, 129, 0.18);
}
.feat-card:hover::before { opacity: 1; }

.feat-card__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}
.feat-card__badge {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--fg-muted);
  text-transform: uppercase;
}
.feat-card__year {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--accent);
  text-transform: uppercase;
}
.feat-card__title {
  font-family: var(--font-display);
  font-size: clamp(32px, 4.6vw, 52px);
  line-height: 1.05;
  font-weight: 400;
  letter-spacing: -0.015em;
  margin-bottom: 22px;
  color: var(--fg);
}
.feat-card__title em { font-style: italic; color: var(--accent); }
.feat-card__desc {
  font-size: 15px;
  line-height: 1.85;
  color: var(--fg-soft);
  margin-bottom: 32px;
  max-width: 560px;
}
.feat-card__cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
  text-transform: uppercase;
  font-weight: 500;
}
.feat-card__cta::after {
  content: '→';
  display: inline-block;
  transition: transform 0.3s var(--ease);
}
.feat-card:hover .feat-card__cta::after { transform: translateX(6px); }

/* ============================================
   Section CTA — reusable inline link
   ============================================ */
.section-cta {
  margin-top: 40px;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
  text-decoration: none;
  text-transform: uppercase;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 6px;
  transition: color 0.3s, border-color 0.3s, gap 0.3s var(--ease);
}
.section-cta::after {
  content: '↗';
  display: inline-block;
  transition: transform 0.3s var(--ease);
}
.section-cta:hover {
  color: var(--accent-hot);
  border-color: var(--accent-hot);
  gap: 18px;
}
.section-cta:hover::after {
  transform: translate(3px, -3px);
}

/* ============================================
   Connect / Links
   ============================================ */
.connect__intro {
  font-size: 15px;
  line-height: 1.85;
  color: var(--fg-soft);
  margin-bottom: 32px;
  max-width: 600px;
}

.connect {
  border-top: 1px solid var(--border);
}
.connect__item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 24px;
  align-items: baseline;
  padding: 22px 0;
  border-bottom: 1px solid var(--border);
}
@media (min-width: 640px) {
  .connect__item { grid-template-columns: 140px 1fr; gap: 32px; }
}

.connect__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--fg-muted);
  text-transform: uppercase;
}

.connect__link {
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 400;
  color: var(--fg);
  text-decoration: none;
  position: relative;
  display: inline-block;
  transition: color 0.3s var(--ease);
  letter-spacing: -0.005em;
}
.connect__link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -3px;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width 0.5s var(--ease);
}
.connect__link:hover { color: var(--accent); }
.connect__link:hover::after { width: 100%; }

/* ============================================
   Footer
   ============================================ */
.foot {
  position: relative;
  z-index: 2;
  border-top: 1px solid var(--border);
  margin-top: clamp(48px, 8vw, 96px);
  padding: 36px 0 56px;
}
.foot__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--fg-muted);
  text-transform: uppercase;
}
.foot__nav {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.foot__nav a {
  color: var(--fg-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.3s, border-color 0.3s;
}
.foot__nav a:hover { color: var(--fg); border-color: var(--fg); }
.foot__sep { color: var(--fg-subtle); }

/* ============================================
   Article (privacy / sub-pages)
   ============================================ */
.article {
  padding: clamp(80px, 14vw, 160px) 0 clamp(56px, 8vw, 96px);
  max-width: 720px;
}
.article__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(40px, 7vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--fg);
}
.article__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--fg-muted);
  text-transform: uppercase;
  margin-bottom: clamp(48px, 7vw, 80px);
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.article__body {
  font-size: 15px;
  line-height: 1.95;
  color: var(--fg-soft);
}
.article__body h2 {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.3;
  color: var(--fg);
  letter-spacing: -0.005em;
  margin: 48px 0 16px;
}
.article__body h2:first-child { margin-top: 0; }
.article__body h2 .article__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent);
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  text-transform: uppercase;
}
.article__body p { margin-bottom: 16px; }
.article__body p:last-child { margin-bottom: 0; }
.article__body a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.2s;
}
.article__body a:hover { color: var(--accent-hot); }
.article__body strong { color: var(--fg); font-weight: 600; }

/* ============================================
   404 page
   ============================================ */
.notfound {
  min-height: 75vh;
  padding: clamp(96px, 14vw, 160px) 0 clamp(48px, 8vw, 96px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.notfound__eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--fg-muted);
  text-transform: uppercase;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.notfound__eyebrow::before {
  content: '';
  width: 28px;
  height: 1px;
  background: var(--fg-muted);
}
.notfound__num {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(140px, 28vw, 320px);
  line-height: 0.85;
  color: var(--accent);
  letter-spacing: -0.05em;
  margin-bottom: 24px;
  user-select: none;
}
.notfound__msg {
  font-family: var(--font-display);
  font-size: clamp(24px, 4vw, 44px);
  line-height: 1.25;
  letter-spacing: -0.005em;
  margin-bottom: 16px;
  max-width: 640px;
  color: var(--fg);
}
.notfound__sub {
  font-size: 15px;
  line-height: 1.85;
  color: var(--fg-soft);
  margin-bottom: 48px;
  max-width: 560px;
}
.notfound__nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-top: 1px solid var(--border);
  max-width: 480px;
}
.notfound__nav a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--fg);
  text-decoration: none;
  text-transform: uppercase;
  transition: color 0.3s, padding 0.3s var(--ease);
}
.notfound__nav a::after {
  content: '→';
  color: var(--fg-muted);
  transition: transform 0.3s var(--ease), color 0.3s;
}
.notfound__nav a:hover { color: var(--accent); padding-left: 8px; }
.notfound__nav a:hover::after { transform: translateX(6px); color: var(--accent); }

/* ============================================
   Page entrance — staggered reveal
   ============================================ */
@media (prefers-reduced-motion: no-preference) {
  .hero, .section, .article, .notfound {
    animation: fadeUp 0.8s var(--ease) backwards;
  }
  .hero { animation-delay: 0.05s; }
  .section:nth-of-type(1) { animation-delay: 0.18s; }
  .section:nth-of-type(2) { animation-delay: 0.24s; }
  .section:nth-of-type(3) { animation-delay: 0.30s; }
  .section:nth-of-type(4) { animation-delay: 0.36s; }
  .section:nth-of-type(5) { animation-delay: 0.42s; }
  .section:nth-of-type(6) { animation-delay: 0.48s; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Selection
   ============================================ */
::selection {
  background: var(--accent);
  color: var(--bg);
}