/* ══════════════════════════════════════════════
   made by biplane — style.css
   Design System: The Precision Navigator
   ══════════════════════════════════════════════ */

/* ─── TOKENS ─── */
:root {
  --surface:            #f7f9fb;
  --surface-low:        #f0f4f7;
  --surface-container:  #e8eff3;
  --surface-high:       #e1e9ee;
  --surface-highest:    #d9e4ea;
  --surface-lowest:     #ffffff;
  --surface-bright:     #f7f9fb;
  --surface-variant:    #d9e4ea;

  --primary:            #565e74;
  --primary-dim:        #4a5268;
  --primary-container:  #dae2fd;
  --primary-fixed-dim:  #ccd4ee;

  --on-primary:         #f7f7ff;
  --on-primary-container: #4a5167;

  --secondary:          #506076;
  --secondary-container:#d3e4fe;
  --on-secondary-container:#435368;

  --on-background:      #2a3439;
  --on-surface:         #2a3439;
  --on-surface-variant: #566166;
  --outline:            #717c82;
  --outline-variant:    #a9b4b9;
}

/* ─── RESET ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--surface);
  color: var(--on-background);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 { font-family: 'Manrope', sans-serif; }

/* ═══════════════════════════════════
   NAV
═══════════════════════════════════ */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  background: rgba(247,249,251,0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(169,180,185,0.15);
  transition: background 0.3s;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 60px;
  gap: 1.5rem;
}

.nav-logo {
  font-family: 'Manrope', sans-serif;
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: -0.03em;
  color: var(--on-background);
  text-decoration: none;
  flex-shrink: 0;
}

/* Desktop links */
.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.2s;
  position: relative;
  white-space: nowrap;
}

.nav-links a:hover { color: var(--on-background); }

.nav-links a.active {
  color: var(--on-background);
  font-weight: 700;
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0; right: 0;
  height: 1.5px;
  background: var(--on-background);
  border-radius: 2px;
}

/* CTA button */
.nav-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.nav-cta {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dim) 100%);
  color: var(--on-primary);
  padding: 0.5rem 1.25rem;
  border-radius: 0.375rem;
  font-size: 0.8125rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  letter-spacing: 0.01em;
  transition: opacity 0.2s, transform 0.15s;
  text-decoration: none;
  white-space: nowrap;
}
.nav-cta:hover  { opacity: 0.9; transform: translateY(-1px); }
.nav-cta:active { transform: scale(0.97); }

/* Hamburger button */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 36px; height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 0.375rem;
  transition: background 0.2s;
}
.nav-hamburger:hover { background: var(--surface-container); }

.nav-hamburger span {
  display: block;
  width: 20px; height: 2px;
  background: var(--on-background);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
  transform-origin: center;
}

/* Hamburger → X animation */
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile drawer */
.mobile-menu {
  display: none;
  position: fixed;
  top: 60px; left: 0; right: 0;
  z-index: 190;
  background: rgba(247,249,251,0.97);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--surface-container);
  padding: 1rem 0 1.5rem;
  transform: translateY(-12px);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.28s cubic-bezier(0.22,1,0.36,1), opacity 0.22s;
}

.mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.mobile-menu ul {
  list-style: none;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.mobile-menu ul li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.875rem 0.75rem;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: 'Manrope', sans-serif;
  color: var(--on-surface-variant);
  text-decoration: none;
  border-radius: 0.5rem;
  transition: background 0.15s, color 0.15s;
  letter-spacing: -0.01em;
}

.mobile-menu ul li a:hover {
  background: var(--surface-container);
  color: var(--on-background);
}

.mobile-menu ul li a.active { color: var(--primary); font-weight: 700; }

.mobile-menu ul li a::after {
  content: '→';
  font-size: 0.75rem;
  opacity: 0.35;
}

.mobile-menu-cta {
  max-width: 1280px;
  margin: 0.75rem auto 0;
  padding: 0 1.5rem;
}

.mobile-menu-cta a {
  display: block;
  text-align: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dim) 100%);
  color: var(--on-primary);
  padding: 0.875rem;
  border-radius: 0.5rem;
  font-family: 'Manrope', sans-serif;
  font-size: 0.9375rem;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -0.01em;
  transition: opacity 0.2s;
}
.mobile-menu-cta a:hover { opacity: 0.9; }

/* Overlay behind mobile menu */
.mobile-overlay {
  display: none;          /* JS가 .open 클래스로만 제어 */
  position: fixed;
  inset: 0;
  z-index: 180;
  background: rgba(42,52,57,0.15);
  backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity 0.25s;
  pointer-events: none;
}
.mobile-overlay.open {
  display: block;
  opacity: 1;
  pointer-events: auto;
}

/* ═══════════════════════════════════
   HERO
═══════════════════════════════════ */
.hero {
  padding: 10rem 2rem 7rem;
  max-width: 1280px;
  margin: 0 auto;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--secondary-container);
  color: var(--on-secondary-container);
  padding: 0.25rem 0.875rem;
  border-radius: 0.375rem;
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 2.5rem;
}

.hero-tag::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--secondary);
  border-radius: 50%;
}

h1.hero-title {
  font-size: clamp(2.6rem, 6vw, 5rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--on-background);
  max-width: 780px;
  margin-bottom: 2rem;
}

.hero-sub {
  font-size: 1.0625rem;
  color: var(--on-surface-variant);
  line-height: 1.75;
  max-width: 540px;
  margin-bottom: 3rem;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ─── BUTTONS ─── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dim) 100%);
  color: var(--on-primary);
  padding: 0.875rem 2rem;
  border-radius: 0.375rem;
  font-size: 0.9375rem;
  font-weight: 700;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.15s;
  font-family: 'Manrope', sans-serif;
  letter-spacing: -0.01em;
}
.btn-primary:hover  { opacity: 0.9; transform: translateY(-1px); }
.btn-primary:active { transform: scale(0.97); }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  background: var(--surface-high);
  color: var(--on-surface);
  padding: 0.875rem 2rem;
  border-radius: 0.375rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
  font-family: 'Manrope', sans-serif;
  letter-spacing: -0.01em;
}
.btn-secondary:hover  { background: var(--surface-highest); }
.btn-secondary:active { transform: scale(0.97); }

/* ─── SECTION COMMONS ─── */
.section-label {
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--on-background);
  line-height: 1.1;
}

/* ═══════════════════════════════════
   AI SECTION — Bento Grid
═══════════════════════════════════ */
.ai-section {
  background: var(--surface-low);
  padding: 6rem 2rem;
}

.ai-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.ai-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 3rem;
  gap: 2rem;
  flex-wrap: wrap;
}

.view-all-link {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--secondary);
  text-decoration: none;
  border-bottom: 1px solid rgba(80,96,118,0.3);
  padding-bottom: 1px;
  transition: border-color 0.2s, color 0.2s;
  white-space: nowrap;
}
.view-all-link:hover { color: var(--primary); border-color: var(--primary); }

.bento {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 1rem;
}

.bento-card {
  background: var(--surface-lowest);
  border-radius: 0.75rem;
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
  box-shadow: 0 2px 12px rgba(42,52,57,0.04);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: block;
}

.bento-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 24px 48px rgba(42,52,57,0.08);
}

.bento-card.large    { grid-column: 1 / 3; grid-row: 1 / 2; }
.bento-card.right-top { grid-column: 3 / 4; grid-row: 1 / 2; }

.bento-img-wrapper { overflow: hidden; width: 100%; }

.bento-img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
  transition: transform 0.6s ease;
}
.bento-card:hover .bento-img { transform: scale(1.03); }

.bento-body { padding: 1.25rem 1.5rem 1.5rem; }

.bento-icon {
  width: 2rem; height: 2rem;
  background: var(--primary-container);
  border-radius: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.875rem;
}
.bento-icon svg { width: 1rem; height: 1rem; color: var(--primary); }

.bento-label {
  font-size: 0.625rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: 0.5rem;
  display: block;
}

.bento-name {
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--on-background);
  margin-bottom: 0.5rem;
  letter-spacing: -0.01em;
  font-family: 'Manrope', sans-serif;
}

.bento-desc {
  font-size: 0.8125rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
}

.bento-link {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--secondary);
  margin-top: 1rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(80,96,118,0.25);
  padding-bottom: 1px;
  transition: all 0.2s;
}
.bento-link:hover { color: var(--primary); border-color: var(--primary); }

.bento-bottom-row {
  grid-column: 1 / 4;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
}

.badge-medical {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  background: rgba(86,94,116,0.08);
  color: var(--secondary);
  padding: 0.2rem 0.625rem;
  border-radius: 0.375rem;
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.625rem;
}

/* ═══════════════════════════════════
   FOUR-COL SECTION (Legal / Commerce / Web Apps / Medical)
═══════════════════════════════════ */
.four-col-section {
  background: var(--surface);
  padding: 6rem 2rem;
}

.four-col-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.four-col-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.col-block {}

.col-block-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--surface-highest);
}

.col-items { display: flex; flex-direction: column; gap: 0.75rem; }

.col-item {
  background: var(--surface-low);
  border-radius: 0.625rem;
  padding: 0.875rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  transition: background 0.2s;
  text-decoration: none;
  color: inherit;
}
.col-item:hover { background: var(--surface-container); }

.col-item-main { flex: 1; min-width: 0; }

.col-item-name {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--on-background);
  margin-bottom: 0.125rem;
  letter-spacing: -0.01em;
  font-family: 'Manrope', sans-serif;
}

.col-item-sub {
  font-size: 0.6875rem;
  color: var(--on-surface-variant);
  line-height: 1.4;
}

.col-item-icon {
  width: 1.75rem; height: 1.75rem;
  border-radius: 0.375rem;
  background: var(--surface-container);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.col-item-icon svg { width: 0.875rem; height: 0.875rem; color: var(--outline); }

.col-item-disabled {
  opacity: 0.45;
  cursor: default;
  pointer-events: none;
}

/* Commerce card */
.commerce-img-card {
  border-radius: 0.75rem;
  overflow: hidden;
  margin-bottom: 0.75rem;
  background: var(--surface-container);
}
.commerce-img-card img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  display: block;
  transition: transform 0.5s;
}
.commerce-img-card:hover img { transform: scale(1.04); }

.commerce-cta {
  display: block;
  text-align: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dim) 100%);
  color: var(--on-primary);
  padding: 0.75rem 1.5rem;
  border-radius: 0.375rem;
  font-size: 0.875rem;
  font-weight: 700;
  margin-top: 0.75rem;
  text-decoration: none;
  font-family: 'Manrope', sans-serif;
  letter-spacing: -0.01em;
  transition: opacity 0.2s;
}
.commerce-cta:hover { opacity: 0.88; }

/* ═══════════════════════════════════
   HOMEPAGES GALLERY
═══════════════════════════════════ */
.gallery-section {
  background: var(--surface-low);
  padding: 6rem 2rem;
}

.gallery-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.gallery-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 3rem;
  gap: 2rem;
  flex-wrap: wrap;
}

.gallery-header-desc {
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  max-width: 340px;
  line-height: 1.7;
  text-align: right;
}

.gallery-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.gallery-card {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.gallery-img-wrapper {
  border-radius: 0.75rem;
  overflow: hidden;
  margin-bottom: 1.25rem;
  background: var(--surface-container);
  box-shadow: 0 2px 12px rgba(42,52,57,0.04);
  transition: box-shadow 0.4s;
}
.gallery-card:hover .gallery-img-wrapper {
  box-shadow: 0 20px 40px rgba(42,52,57,0.10);
}

.gallery-img-wrapper img {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
  display: block;
  transition: transform 0.6s ease;
}
.gallery-card:hover img { transform: scale(1.03); }

.gallery-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0 0.25rem;
}

.gallery-card-name {
  font-size: 1.0625rem;
  font-weight: 800;
  color: var(--on-background);
  letter-spacing: -0.02em;
  font-family: 'Manrope', sans-serif;
}

.gallery-card-tag {
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--outline-variant);
}

/* ═══════════════════════════════════
   CTA SECTION
═══════════════════════════════════ */
.cta-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dim) 100%);
  padding: 8rem 2rem;
}

.cta-inner {
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.cta-inner h2 {
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 900;
  color: var(--on-primary);
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin-bottom: 2.5rem;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  background: var(--surface-lowest);
  color: var(--primary);
  padding: 1rem 2.5rem;
  border-radius: 0.375rem;
  font-family: 'Manrope', sans-serif;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}
.cta-btn:hover  { background: var(--surface); transform: translateY(-2px); }
.cta-btn:active { transform: scale(0.97); }

/* ═══════════════════════════════════
   FOOTER
═══════════════════════════════════ */
footer {
  background: var(--surface-low);
  padding: 4rem 2rem 2rem;
  border-top: 1px solid var(--surface-container);
}

.footer-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--surface-container);
  margin-bottom: 2rem;
}

.footer-brand-name {
  font-family: 'Manrope', sans-serif;
  font-weight: 800;
  font-size: 0.9375rem;
  color: var(--on-background);
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.footer-brand-desc {
  font-size: 0.75rem;
  color: var(--on-surface-variant);
  line-height: 1.75;
}

.footer-brand-desc a {
  color: var(--on-surface-variant);
  text-decoration: none;
}

.footer-brand-desc a:hover {
  color: var(--on-background);
}

.footer-col-title {
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--on-background);
  margin-bottom: 1rem;
}

.footer-links { list-style: none; display: flex; flex-direction: column; gap: 0.625rem; }

.footer-links a {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--on-background); }

.footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.6875rem;
  color: var(--outline);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* ═══════════════════════════════════
   ANIMATIONS
═══════════════════════════════════ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-up {
  opacity: 0;
  animation: fadeUp 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.45s; }

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity  0.7s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.visible { opacity: 1; transform: none; }

/* ═══════════════════════════════════
   RESPONSIVE
═══════════════════════════════════ */
@media (max-width: 1024px) {
  .four-col-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 900px) {
  /* Show hamburger, hide desktop links */
  .nav-links      { display: none; }
  .nav-hamburger  { display: flex; }
  .mobile-menu    { display: block; }
  /* .mobile-overlay 는 JS의 .open 클래스로만 제어 — 여기서 켜지 않음 */

  /* Bento stacks */
  .bento {
    display: flex;
    flex-direction: column;
  }
  .bento-card.large,
  .bento-card.right-top {
    grid-column: unset;
    grid-row: unset;
  }
  .bento-bottom-row {
    display: flex;
    flex-direction: column;
    gap: 1rem;
  }

  /* Gallery stacks */
  .gallery-grid          { grid-template-columns: 1fr; }
  .gallery-header-desc   { text-align: left; }

  .hero { padding: 8rem 1.5rem 5rem; }
}

@media (max-width: 640px) {
  .four-col-grid  { grid-template-columns: 1fr; }
  .footer-grid    { grid-template-columns: 1fr 1fr; }
  .footer-bottom  { flex-direction: column; align-items: flex-start; }
  .nav-inner      { padding: 0 1.25rem; }
  h1.hero-title   { font-size: clamp(2rem, 8vw, 3rem); }
}

@media (max-width: 400px) {
  .footer-grid { grid-template-columns: 1fr; }
}