:root {
  color-scheme: dark;
  --ink-black: #0d1b2a;
  --prussian-blue: #1b263b;
  --dusk-blue: #415a77;
  --dusty-denim: #778da9;
  --alabaster-grey: #e0e1dd;

  --color-bg: var(--ink-black);
  --color-surface: var(--prussian-blue);
  --color-surface-soft: #16233a;
  --color-border: rgba(119, 141, 169, 0.22);
  --color-text: var(--alabaster-grey);
  --color-text-muted: var(--dusty-denim);
  --color-accent: var(--dusty-denim);
  --color-cta-bg: var(--alabaster-grey);
  --color-cta-text: var(--ink-black);

  --font-sans: "Hiragino Sans", "Yu Gothic", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(circle at 15% 0%, rgba(65, 90, 119, 0.35), transparent 45%),
    radial-gradient(circle at 85% 15%, rgba(27, 38, 59, 0.6), transparent 40%);
  -webkit-font-smoothing: antialiased;
  line-height: 1.7;
  overflow-x: hidden;
}

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Reveal-on-scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Header ---------- */
header.site {
  padding: 26px 0;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(13, 27, 42, 0.55);
  border-bottom: 1px solid var(--color-border);
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.02em;
}
.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 2px 9px 9px 9px;
  background: var(--alabaster-grey);
  color: var(--ink-black);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
}
nav.site-nav {
  display: flex;
  gap: 34px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
nav.site-nav a {
  position: relative;
  padding-bottom: 4px;
}
nav.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.35s var(--ease);
}
nav.site-nav a:hover { color: var(--color-text); }
nav.site-nav a:hover::after { transform: scaleX(1); transform-origin: left; }

.header-right {
  display: flex;
  align-items: center;
  gap: 28px;
}
.social-link {
  display: inline-flex;
  align-items: center;
  color: var(--color-text-muted);
  transition: color 0.25s var(--ease);
}
.social-link:hover { color: var(--color-text); }
.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
}
.lang-switch a { padding: 2px; }
.lang-switch a.is-active {
  color: var(--color-text);
  font-weight: 700;
}
.lang-switch a:hover { color: var(--color-text); }
.lang-switch .sep { opacity: 0.5; }

.nav-toggle {
  display: none;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
header.site.is-nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
header.site.is-nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
header.site.is-nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 700px) {
  .nav-toggle { display: flex; }
  .header-right {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 22px;
    background: var(--ink-black);
    border-bottom: 1px solid var(--color-border);
    padding: 26px 24px 32px;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    transition: max-height 0.3s var(--ease), opacity 0.25s var(--ease);
  }
  header.site.is-nav-open .header-right {
    max-height: calc(100vh - 68px);
    overflow-y: auto;
    opacity: 1;
    pointer-events: auto;
  }
  nav.site-nav {
    flex-direction: column;
    gap: 20px;
    font-size: 14px;
  }
  .lang-switch { font-size: 13px; }
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 140px 0 60px;
}
.eyebrow {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 7px 18px;
  margin-bottom: 32px;
}
h1 {
  font-size: clamp(40px, 8vw, 92px);
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin: 0 0 32px;
  max-width: 900px;
}
h1 .line { display: block; overflow: hidden; }
h1 .line span { display: block; transition: transform 1s var(--ease), opacity 1s var(--ease); }
h1 .accent { color: var(--dusty-denim); }
.hero-copy {
  max-width: 640px;
  display: grid;
  gap: 10px;
}
.hero-copy p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 16px;
}
.hero-copy p.en {
  font-size: 13px;
  letter-spacing: 0.01em;
  opacity: 0.7;
}
.cta-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 44px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 700;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.btn:hover { opacity: 0.85; transform: translateY(-1px); }
.btn-primary {
  background: var(--color-cta-bg);
  color: var(--color-cta-text);
}
.btn-secondary {
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.scroll-cue {
  position: absolute;
  left: 24px;
  bottom: 36px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.scroll-cue .stem {
  width: 1px;
  height: 42px;
  background: linear-gradient(to bottom, var(--color-text-muted), transparent);
  animation: stem-pulse 2.4s var(--ease) infinite;
}
@keyframes stem-pulse {
  0%, 100% { transform: scaleY(1); opacity: 0.7; }
  50% { transform: scaleY(0.6); opacity: 1; }
}

/* ---------- Section shared ---------- */
section { position: relative; padding: 160px 0; }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 80px;
  flex-wrap: wrap;
}
.section-head .eyebrow { margin-bottom: 0; }
.section-head h2 {
  font-size: clamp(28px, 4vw, 40px);
  margin: 0;
  letter-spacing: -0.02em;
}
.section-head .section-note {
  color: var(--color-text-muted);
  font-size: 14px;
  max-width: 280px;
}

.blog-intro {
  color: var(--color-text-muted);
  font-size: 16px;
  line-height: 1.8;
  max-width: 560px;
  margin: -40px 0 60px;
}

/* ---------- Projects (index rows) ---------- */
.blog-category-heading {
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin: 56px 0 8px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--dusk-blue);
}
.blog-category-group:first-child .blog-category-heading { margin-top: 0; }
.project-list { border-top: 1px solid var(--color-border); }
.project-row {
  display: grid;
  grid-template-columns: 90px 1fr auto;
  align-items: center;
  gap: 32px;
  padding: 44px 0;
  border-bottom: 1px solid var(--color-border);
  transition: padding 0.4s var(--ease);
}
.project-row .index-num {
  font-size: 15px;
  color: var(--color-text-muted);
  font-weight: 700;
  letter-spacing: 0.05em;
}
.project-row .project-main h3 {
  margin: 0 0 8px;
  font-size: clamp(22px, 3vw, 30px);
  letter-spacing: -0.01em;
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.project-row .project-main h3 .jp {
  font-size: 14px;
  color: var(--color-text-muted);
  font-weight: 500;
}
.project-row .project-main p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 15px;
  max-width: 480px;
}
.project-row .project-cta {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
}
.project-row .project-main .project-cta {
  margin-top: 6px;
}
.project-row .project-cta .arrow {
  transition: transform 0.35s var(--ease);
}
.project-row.has-shot {
  grid-template-columns: 90px 1fr 260px;
}
.project-row .project-shot {
  display: block;
  position: relative;
  width: 100%;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: 0 20px 40px -20px rgba(0, 0, 0, 0.5);
  background: var(--alabaster-grey);
  transition: height 0.7s var(--ease);
}
.project-row .project-shot .shot-slide {
  position: absolute;
  top: 0;
  left: 0;
  display: block;
  width: 100%;
  height: auto;
  opacity: 0;
  transition: opacity 0.9s var(--ease);
}
.project-row .project-shot .shot-slide.is-active {
  opacity: 1;
  z-index: 1;
}
.project-row:hover { padding-left: 12px; padding-right: 12px; }
.project-row:hover .project-cta .arrow { transform: translateX(6px); }
.project-row:hover .index-num { color: var(--color-text); }
.project-row.is-placeholder { opacity: 0.55; }
.project-row.is-placeholder .project-cta {
  color: var(--color-text-muted);
  font-weight: 500;
}
.badge-soon {
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px dashed var(--color-border);
  color: var(--color-text-muted);
  margin-left: 4px;
}

.mobile-soon {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  color: var(--color-text-muted);
}

/* ---------- Project usage steps (howto) ---------- */
.project-list .howto {
  padding-top: 20px;
  padding-left: 122px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}
.project-list .howto summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text-muted);
  padding: 4px 0;
  transition: color 0.2s ease;
}
.project-list .howto summary::-webkit-details-marker { display: none; }
.project-list .howto summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 12px;
  line-height: 1;
}
.project-list .howto[open] summary::before { content: "\2212"; }
.project-list .howto summary:hover { color: var(--color-text); }
.howto-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 18px;
}
.howto-col h4 {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.howto-col ol {
  margin: 0;
  padding-left: 20px;
  color: var(--color-text-muted);
  font-size: 13px;
  display: grid;
  gap: 6px;
}

@media (max-width: 720px) {
  .howto-body { grid-template-columns: 1fr; gap: 16px; }
  .project-list .howto { padding-left: 0; }
}

@media (max-width: 720px) {
  .project-row,
  .project-row.has-shot {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .project-row .project-cta { justify-self: start; }
  .project-row .index-num { font-size: 12px; }
  .project-row .project-main h3 { font-size: 19px; }
  .project-row .project-main h3 .jp { font-size: 12px; }
  .project-row .project-main p { font-size: 13px; }
  .project-row .project-cta { font-size: 11px; }
  .project-row .project-shot {
    width: 200px;
    max-width: 100%;
    margin: 0 auto;
  }
}

/* ---------- ClipArts ---------- */
.clipart-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 28px;
  margin-bottom: 40px;
  padding: 18px 22px;
  border-radius: 14px;
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border);
}
.control-group {
  display: flex;
  align-items: center;
  gap: 10px;
}
.control-label {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  white-space: nowrap;
}
.swatch-row {
  display: flex;
  gap: 6px;
}
.swatch {
  width: 22px;
  height: 22px;
  border-radius: 999px;
  border: 2px solid transparent;
  box-shadow: 0 0 0 1px var(--color-border);
  cursor: pointer;
  padding: 0;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.swatch:hover { transform: translateY(-1px); }
.swatch.is-active {
  border-color: var(--alabaster-grey);
  box-shadow: 0 0 0 1px var(--dusty-denim);
}
.swatch-custom {
  width: 22px;
  height: 22px;
  border-radius: 999px;
  border: none;
  padding: 0;
  cursor: pointer;
  background: none;
}
.clipart-controls input[type="range"] {
  width: 130px;
  accent-color: var(--dusty-denim);
}
.control-value {
  font-size: 12px;
  color: var(--color-text-muted);
  min-width: 36px;
}
.series-block { margin-bottom: 56px; }
.series-block:last-child { margin-bottom: 0; }
.series-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 24px;
}
.series-head h3 {
  margin: 0;
  font-size: 20px;
  letter-spacing: -0.01em;
}
.series-head .series-jp {
  font-size: 13px;
  color: var(--color-text-muted);
  font-weight: 500;
}
.series-head .series-tag {
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 4px 12px;
}
.clipart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}
.pack-card {
  padding: 26px 26px 22px;
  border-radius: 18px;
  background: var(--alabaster-grey);
  border: 1px solid var(--color-border);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.pack-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px -20px rgba(0, 0, 0, 0.5);
}
.pack-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}
.pack-head h3 {
  margin: 0;
  font-size: 18px;
  color: var(--ink-black);
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.pack-head .pack-en {
  font-size: 12px;
  font-weight: 500;
  color: var(--dusk-blue);
}
.pack-count {
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink-black);
  background: rgba(13, 27, 42, 0.08);
  border-radius: 999px;
  padding: 5px 12px;
  white-space: nowrap;
}
.pack-preview {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
}
.pack-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 1;
  border-radius: 10px;
  background: rgba(13, 27, 42, 0.04);
  color: var(--clipart-ink, var(--ink-black));
}
.pack-icon svg {
  width: var(--clipart-icon-size, 34px);
  height: var(--clipart-icon-size, 34px);
  transition: width 0.15s ease, height 0.15s ease;
}
.pack-icon svg g {
  stroke-width: var(--clipart-stroke, 3px);
  transition: stroke-width 0.15s ease;
}
.pack-icon .clip-accent {
  fill: var(--clipart-accent, #c9714b);
  transition: fill 0.15s ease;
}
.clipart-note {
  margin-top: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  text-align: center;
}
.clipart-note p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 14px;
}
@media (max-width: 560px) {
  .pack-preview { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 64px;
}
.about-grid .about-num {
  font-size: clamp(80px, 12vw, 160px);
  font-weight: 800;
  line-height: 0.8;
  color: var(--color-surface);
  letter-spacing: -0.04em;
}
.about-copy p {
  margin: 0 0 20px;
  color: var(--color-text-muted);
  font-size: 17px;
}
.about-copy p strong { color: var(--color-text); font-weight: 700; }
.about-copy p.en {
  font-size: 13px;
  opacity: 0.65;
  border-top: 1px solid var(--color-border);
  padding-top: 20px;
  margin-top: 32px;
}
@media (max-width: 720px) {
  .about-grid { grid-template-columns: 1fr; gap: 24px; }
  .about-grid .about-num { display: none; }
}

/* ---------- Contact ---------- */
.contact-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 28px;
}
.contact-row .mail-link {
  font-size: clamp(24px, 5vw, 44px);
  font-weight: 700;
  letter-spacing: -0.01em;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 6px;
  transition: color 0.25s ease, border-color 0.25s ease;
}
.contact-row .mail-link:hover {
  color: var(--dusty-denim);
  border-color: var(--dusty-denim);
}
.contact-note {
  color: var(--color-text-muted);
  font-size: 14px;
  max-width: 240px;
}

/* ---------- Footer ---------- */
footer.site {
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
}
footer.site .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--color-text-muted);
}

@media (max-width: 560px) {
  section { padding: 100px 0; }
  .hero { padding: 120px 0 48px; }
  .scroll-cue { display: none; }
}