/* =========================================================================
   JinsLab — Design System & Layout
   ========================================================================= */

/* ---------- Design Tokens ---------- */
:root {
  /* Colors */
  --bg:            #0A0A0B;
  --bg-elev:       #111114;
  --surface:       #16161A;
  --surface-2:     #1D1D22;
  --border:        #26262C;
  --border-strong: #33333A;
  --text:          #F5F5F7;
  --text-muted:    #A1A1AA;
  --text-dim:      #71717A;
  --accent:        #6366F1;
  --accent-soft:   #818CF8;
  --accent-glow:   rgba(99, 102, 241, 0.35);

  /* Typography */
  --font-sans: "Inter", "Pretendard", -apple-system, BlinkMacSystemFont,
               "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* Spacing / layout */
  --max-w: 1200px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --section-py: clamp(5rem, 12vw, 9rem);

  /* Motion */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.6s;

  /* Radius */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 22px;
  --r-pill: 999px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }

/* ---------- Base ---------- */
html, body { background: var(--bg); color: var(--text); }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  font-feature-settings: "ss01", "cv11";
}

::selection { background: var(--accent); color: #fff; }

:focus-visible {
  outline: 2px solid var(--accent-soft);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text);
}
h1 { font-size: clamp(2.5rem, 6vw, 5.25rem); }
h2 { font-size: clamp(1.875rem, 4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.5rem); }
p  { color: var(--text-muted); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--surface);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-muted);
}
.eyebrow::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
}

/* ---------- Layout utilities ---------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

section { padding-block: var(--section-py); }

.section-head {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 720px;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}
.section-head p { font-size: 1.0625rem; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.375rem;
  border-radius: var(--r-pill);
  font-weight: 500;
  font-size: 0.9375rem;
  line-height: 1;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease),
              border-color 0.2s var(--ease), color 0.2s var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 30px -10px var(--accent-glow);
}
.btn-primary:hover { background: var(--accent-soft); transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-ghost:hover { border-color: var(--text); background: var(--surface); }

.btn svg { width: 16px; height: 16px; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease),
              backdrop-filter 0.25s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(10, 10, 11, 0.72);
  backdrop-filter: saturate(150%) blur(16px);
  -webkit-backdrop-filter: saturate(150%) blur(16px);
  border-bottom-color: var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: 1.0625rem;
}
.brand-mark {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #A5B4FC);
  box-shadow: 0 8px 20px -8px var(--accent-glow);
  color: #0A0A0B;
  font-weight: 700;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}
.nav-links a {
  font-size: 0.9375rem;
  color: var(--text-muted);
  transition: color 0.2s var(--ease);
}
.nav-links a:hover { color: var(--text); }

.nav-cta { display: inline-flex; }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  align-items: center;
  justify-content: center;
}
.nav-toggle span {
  position: relative;
  display: block;
  width: 18px; height: 1.5px;
  background: var(--text);
  transition: transform 0.25s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 1.5px;
  background: var(--text);
  transition: transform 0.25s var(--ease);
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after  { top:  6px; }

.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after  { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding-top: calc(72px + clamp(4rem, 10vw, 8rem));
  padding-bottom: clamp(5rem, 12vw, 9rem);
  overflow: hidden;
  isolation: isolate;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 4rem);
  align-items: center;
}

.hero h1 { margin-top: 1.5rem; }
.hero h1 .accent { color: var(--accent-soft); }

.hero-sub {
  margin-top: 1.5rem;
  font-size: clamp(1rem, 1.4vw, 1.1875rem);
  max-width: 36ch;
  color: var(--text-muted);
}

.hero-ctas {
  margin-top: 2.25rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Background visuals */
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to bottom, transparent 0%, var(--bg) 90%),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='48' height='48' viewBox='0 0 48 48'><path d='M48 0H0v48' fill='none' stroke='%23262632' stroke-width='0.6'/></svg>");
  background-size: auto, 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 85%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 85%);
  opacity: 0.6;
}

.hero-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 480px;
  margin-left: auto;
}
.orb {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 35%, #A5B4FC 0%, transparent 55%),
    radial-gradient(circle at 65% 70%, var(--accent) 0%, transparent 60%),
    radial-gradient(circle at 50% 50%, #312E81 0%, transparent 70%);
  filter: blur(40px);
  opacity: 0.75;
  animation: orb-float 12s ease-in-out infinite;
}
.orb::after {
  content: "";
  position: absolute;
  inset: 15%;
  border-radius: 50%;
  background: radial-gradient(circle, #fff 0%, transparent 60%);
  opacity: 0.08;
  filter: blur(20px);
}
.orb-ring {
  position: absolute;
  inset: 12%;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: radial-gradient(circle at 50% 50%, transparent 60%, rgba(99, 102, 241, 0.08));
  backdrop-filter: blur(1px);
}
.orb-ring::before {
  content: "";
  position: absolute;
  inset: 14%;
  border-radius: 50%;
  border: 1px dashed rgba(99, 102, 241, 0.25);
  animation: spin 24s linear infinite;
}

@keyframes orb-float {
  0%, 100% { transform: translateY(0) scale(1); }
  50%      { transform: translateY(-14px) scale(1.03); }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------- About / Stats ---------- */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 4rem);
  align-items: start;
}
.about-copy p {
  font-size: 1.0625rem;
  max-width: 52ch;
}
.about-copy p + p { margin-top: 1rem; }

.stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
.stat {
  padding: 1.5rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.stat:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.stat-num {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text);
}
.stat-num .unit { color: var(--accent-soft); }
.stat-label {
  margin-top: 0.25rem;
  font-size: 0.875rem;
  color: var(--text-dim);
}

/* ---------- Research / Cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
}
.card {
  position: relative;
  padding: 1.75rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease),
              background 0.25s var(--ease);
  overflow: hidden;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(600px circle at var(--mx, 50%) var(--my, 0%),
              rgba(99, 102, 241, 0.08), transparent 40%);
  opacity: 0;
  transition: opacity 0.25s var(--ease);
  pointer-events: none;
}
.card:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.card:hover::before { opacity: 1; }

.card-icon {
  width: 42px; height: 42px;
  border-radius: 12px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.18), rgba(99, 102, 241, 0.04));
  border: 1px solid var(--border);
  color: var(--accent-soft);
  margin-bottom: 1.25rem;
}
.card-icon svg { width: 20px; height: 20px; }
.card h3 { font-size: 1.125rem; margin-bottom: 0.5rem; }
.card p { font-size: 0.9375rem; color: var(--text-muted); }

/* ---------- Services ---------- */
.services-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(2rem, 6vw, 4rem);
  align-items: start;
}
.services-list { border-top: 1px solid var(--border); }
.service {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.5rem;
  align-items: center;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
  transition: padding 0.25s var(--ease);
}
.service:hover { padding-inline: 0.5rem; }
.service-num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-dim);
  letter-spacing: 0.05em;
}
.service-title {
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--text);
}
.service-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}
.service-arrow {
  color: var(--text-dim);
  transition: transform 0.2s var(--ease), color 0.2s var(--ease);
}
.service:hover .service-arrow { color: var(--accent-soft); transform: translateX(4px); }

/* ---------- Process / Timeline ---------- */
.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1rem;
}
.step {
  position: relative;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-soft);
  margin-bottom: 1rem;
}
.step h3 { font-size: 1.0625rem; margin-bottom: 0.375rem; }
.step p { font-size: 0.875rem; }

/* ---------- Contact / CTA ---------- */
.cta {
  position: relative;
  text-align: center;
  padding-block: clamp(5rem, 10vw, 8rem);
  border-top: 1px solid var(--border);
  overflow: hidden;
}
.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 80% at 50% 50%, var(--accent-glow), transparent 70%);
  opacity: 0.35;
  pointer-events: none;
}
.cta h2 { position: relative; max-width: 18ch; margin-inline: auto; }
.cta p { position: relative; margin-top: 1.25rem; max-width: 48ch; margin-inline: auto; }
.cta-actions {
  position: relative;
  margin-top: 2rem;
  display: inline-flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 3rem;
  color: var(--text-dim);
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}
.footer-tag { font-size: 0.9375rem; max-width: 36ch; margin-top: 0.75rem; }
.footer-links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.footer-links a {
  font-size: 0.9375rem;
  color: var(--text-muted);
  transition: color 0.2s var(--ease);
}
.footer-links a:hover { color: var(--text); }
.footer-bottom {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.8125rem;
}

/* ---------- Reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { max-width: 360px; margin-inline: auto; }
  .about-grid, .services-grid { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links,
  .nav-cta { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-header.is-open .mobile-menu { display: flex; }

  .mobile-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0; right: 0;
    flex-direction: column;
    gap: 0.25rem;
    padding: 1rem var(--gutter) 1.5rem;
    background: rgba(10, 10, 11, 0.95);
    backdrop-filter: saturate(150%) blur(16px);
    -webkit-backdrop-filter: saturate(150%) blur(16px);
    border-bottom: 1px solid var(--border);
  }
  .mobile-menu a {
    padding: 0.875rem 0.25rem;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    font-size: 1rem;
  }
  .mobile-menu a:last-of-type { border-bottom: 0; }
  .mobile-menu .btn { margin-top: 0.75rem; justify-content: center; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
}

@media (max-width: 480px) {
  .service { grid-template-columns: auto 1fr; }
  .service-arrow { display: none; }
  .stats { grid-template-columns: 1fr; }
  .timeline { grid-template-columns: 1fr; }
  .hero-ctas .btn { width: 100%; justify-content: center; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}