/* ==============================================
   moku Lab — style.css
   Design: Minimal Lab / Experimental Studio
   ============================================== */

/* ---- TOKENS ---- */
:root {
  --bg:           #f7f7f5;
  --bg-2:         #efeeeb;
  --surface:      #ffffff;
  --surface-2:    #f2f1ee;
  --border:       #e0deda;
  --border-2:     #cccac5;
  --text-primary: #1a1917;
  --text-body:    #3d3b38;
  --text-muted:   #8a8780;
  --text-dim:     #b5b3af;
  --accent:       #4f7cff;
  --accent-light: #eef1ff;
  --accent-2:     #d4e0ff;
  --mono-font:    'Space Mono', 'Courier New', monospace;
  --sans-ja:      'Noto Sans JP', 'Hiragino Sans', sans-serif;
  --sans-en:      'Inter', -apple-system, sans-serif;
  --radius-sm:    6px;
  --radius-md:    12px;
  --radius-lg:    20px;
  --shadow-sm:    0 1px 4px rgba(0,0,0,0.06);
  --shadow-md:    0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg:    0 12px 40px rgba(0,0,0,0.10);
  --transition:   0.24s cubic-bezier(.4,0,.2,1);
  --max-w:        1080px;
}

/* ---- RESET ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--sans-ja);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ---- HELPERS ---- */
.mono { font-family: var(--mono-font); }
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 60px);
}
.accent { color: var(--accent); }
.dim { color: var(--text-dim); }

/* ======================================================
   HEADER / NAV
   ====================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(247, 247, 245, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}
.site-header.scrolled {
  border-bottom-color: var(--border);
  background: rgba(247, 247, 245, 0.95);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-w);
  margin-inline: auto;
  padding: 0 clamp(20px, 5vw, 60px);
  height: 60px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: opacity var(--transition);
}
.logo:hover { opacity: 0.7; }
.logo-mark {
  font-family: var(--mono-font);
  color: var(--accent);
  font-size: 1.2rem;
  line-height: 1;
  display: inline-block;
  animation: spin-slow 10s linear infinite;
}
@keyframes spin-slow {
  from { transform: rotate(0); }
  to   { transform: rotate(360deg); }
}
.logo-text {
  font-family: var(--sans-en);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}
.nav-links a {
  font-family: var(--sans-en);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text-primary); }

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--text-primary);
  transition: var(--transition);
}
.nav-mobile {
  display: none;
  position: absolute;
  top: 60px; left: 0; right: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition), transform var(--transition);
}
.nav-mobile.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}
.nav-mobile ul { display: flex; flex-direction: column; }
.nav-mobile a {
  display: block;
  padding: 12px clamp(20px, 5vw, 60px);
  font-family: var(--sans-en);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: background var(--transition), color var(--transition);
}
.nav-mobile a:hover {
  background: var(--bg-2);
  color: var(--text-primary);
}

/* ======================================================
   HERO
   ====================================================== */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 100px clamp(20px, 5vw, 60px) 80px;
  max-width: var(--max-w);
  margin-inline: auto;
}

/* Grid background */
.hero-bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: -1px -1px;
  opacity: 0.45;
}

.hero-content {
  flex: 1;
  max-width: 560px;
}
.hero-label {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.hero-label::before {
  content: '';
  display: block;
  width: 28px; height: 1px;
  background: var(--text-dim);
}
.hero-title {
  font-family: var(--sans-en);
  font-size: clamp(3rem, 9vw, 5.5rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 28px;
  color: var(--text-primary);
}
.hero-catch {
  font-family: var(--sans-ja);
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  font-weight: 400;
  color: var(--text-body);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}
.hero-sub {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.9;
  margin-bottom: 40px;
}
.hero-cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 44px;
  padding: 0 24px;
  border-radius: var(--radius-sm);
  font-family: var(--sans-en);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--text-primary);
  color: var(--bg);
  border: 1px solid var(--text-primary);
}
.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-ghost {
  background: transparent;
  color: var(--text-body);
  border: 1px solid var(--border-2);
}
.btn-ghost:hover {
  background: var(--surface-2);
  border-color: var(--text-muted);
  transform: translateY(-1px);
}

/* Hero visual decoration */
.hero-visual {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 320px;
  height: 320px;
  position: relative;
  margin-left: 40px;
}
.lab-orb {
  width: 200px; height: 200px;
  border-radius: 50%;
  background: conic-gradient(
    from 0deg,
    var(--accent-2) 0%,
    var(--bg-2) 40%,
    var(--border) 70%,
    var(--accent-2) 100%
  );
  animation: orb-rotate 12s linear infinite;
  opacity: 0.6;
  position: relative;
}
@keyframes orb-rotate {
  from { transform: rotate(0); }
  to   { transform: rotate(360deg); }
}
.lab-orb::after {
  content: '';
  position: absolute;
  inset: 16px;
  border-radius: 50%;
  background: var(--bg);
}
.lab-dots {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--border-2) 1px, transparent 1px);
  background-size: 24px 24px;
  border-radius: 50%;
  opacity: 0.7;
  animation: dots-pulse 6s ease-in-out infinite;
}
@keyframes dots-pulse {
  0%, 100% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 0.8; transform: scale(1.04); }
}

/* ======================================================
   SECTIONS — SHARED
   ====================================================== */
.section {
  padding-block: clamp(64px, 10vw, 120px);
}
.section-label {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 32px;
}
.section-title {
  font-family: var(--sans-ja);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.4;
  margin-bottom: 24px;
  color: var(--text-primary);
}
.section-lead {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 48px;
  max-width: 480px;
}
.body-text {
  font-size: 0.92rem;
  color: var(--text-body);
  line-height: 2;
  margin-bottom: 18px;
}

/* ======================================================
   ABOUT
   ====================================================== */
.about-section { background: var(--surface); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 60px;
  align-items: start;
}
.about-text { max-width: 520px; }
.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 28px;
}
.tag {
  display: inline-block;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-family: var(--mono-font);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  transition: border-color var(--transition), color var(--transition);
}
.tag:hover { border-color: var(--accent); color: var(--accent); }

/* Decorative code card */
.about-deco {
  position: sticky;
  top: 80px;
}
.deco-card {
  background: var(--text-primary);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  min-width: 240px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.deco-card-line {
  font-size: 0.72rem;
  color: #a0a8c0;
  letter-spacing: 0.06em;
}
.deco-card-line.accent { color: #7eb8ff; }
.deco-card-line.accent span { color: #a8d8ff; }
.deco-card-line.dim { color: #4a5060; }
.deco-card-sep {
  height: 1px;
  background: #2a2e3a;
  margin-block: 4px;
}

/* ======================================================
   APPS
   ====================================================== */
.apps-section { background: var(--bg); }
.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.app-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.app-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--border-2);
}
.app-card--soon {
  opacity: 0.7;
  background: var(--surface-2);
}
.app-card--soon:hover { transform: none; box-shadow: none; }
.app-card-inner {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.app-icon-wrap { flex: 0 0 auto; }
.app-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-family: var(--mono-font);
}
.app-icon--a { background: var(--accent-light); color: var(--accent); }
.app-icon--b { background: var(--bg-2); color: var(--text-dim); }
.app-card-meta {
  font-size: 0.68rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.app-card-title {
  font-family: var(--sans-en);
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}
.app-card-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}
.app-card-links { display: flex; gap: 12px; align-items: center; }
.app-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--sans-en);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--accent);
  padding: 6px 14px;
  border: 1px solid var(--accent-2);
  border-radius: 100px;
  background: var(--accent-light);
  transition: background var(--transition), border-color var(--transition);
}
.app-link:hover { background: var(--accent-2); }
.app-link-icon { font-style: normal; font-size: 0.85em; }
.app-badge {
  font-size: 0.68rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  border: 1px solid var(--border);
  padding: 5px 12px;
  border-radius: 100px;
}

/* ======================================================
   CONTACT
   ====================================================== */
.contact-section { background: var(--surface); }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 4px;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  transition: border-color var(--transition), background var(--transition), transform var(--transition);
  cursor: pointer;
}
.contact-item:hover {
  border-color: var(--accent);
  background: var(--accent-light);
  transform: translateX(4px);
}
.contact-item-icon {
  font-size: 1rem;
  width: 36px; height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
  flex: 0 0 auto;
  color: var(--text-muted);
}
.contact-item-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 2px;
}
.contact-item-value {
  font-family: var(--sans-en);
  font-size: 0.88rem;
  color: var(--text-body);
  font-weight: 500;
}
.contact-item-arrow {
  margin-left: auto;
  font-family: var(--mono-font);
  color: var(--text-dim);
  font-size: 0.85rem;
  transition: transform var(--transition), color var(--transition);
}
.contact-item:hover .contact-item-arrow {
  transform: translateX(4px);
  color: var(--accent);
}

/* ======================================================
   FOOTER
   ====================================================== */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 32px;
  background: var(--bg);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-logo .logo-mark { animation: none; font-size: 1rem; }
.footer-logo .logo-text { font-family: var(--sans-en); font-size: 0.9rem; font-weight: 600; }
.footer-copy {
  font-size: 0.68rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
}

/* ======================================================
   ANIMATIONS (entrance)
   ====================================================== */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ======================================================
   RESPONSIVE
   ====================================================== */
@media (max-width: 860px) {
  .hero {
    flex-direction: column;
    align-items: flex-start;
    gap: 60px;
    min-height: auto;
    padding-top: 100px;
    padding-bottom: 60px;
  }
  .hero-visual { margin-left: 0; width: 200px; height: 200px; }
  .lab-orb { width: 130px; height: 130px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .about-deco { position: static; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-mobile { display: block; }
  .hero-title { font-size: clamp(2.4rem, 12vw, 3.6rem); }
  .apps-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 8px; }
  .hero-visual { display: none; }
  .br-pc { display: none; }
}

/* ---- Scroll fade helpers ---- */
@media (prefers-reduced-motion: reduce) {
  .fade-up { opacity: 1; transform: none; transition: none; }
  .logo-mark { animation: none; }
  .lab-orb, .lab-dots { animation: none; }
}