/* ─────────────────────────────────────────────────────────────────────────
   AI3 Design System v0.1 — 공통 스타일시트
   한국 기업용 생성형 AI 회사. Pretendard Variable + JetBrains Mono.
   Together AI(다크/라이트 캔버스 교대) + MiniMax(제품 컬러 인코딩) +
   한국 보정(KRDS 본문 16px / lh 1.6 / 토스 톤).
   ───────────────────────────────────────────────────────────────────────── */

:root {
  /* Canvas */
  --canvas: #FFFFFF;
  --canvas-dim: #FAF9F5;
  --canvas-warm: #F1EFE7;
  --canvas-dark: #0B0B12;
  --canvas-dark-soft: #16161F;
  --canvas-dark-elev: #1F1F2A;

  /* Ink */
  --ink: #0E0E12;
  --ink-strong: #000000;
  --body: #4B4B55;
  --body-soft: #6E6E78;
  --body-muted: #9B9BA3;
  --on-dark: #FFFFFF;
  --on-dark-soft: #C6C6CF;
  --on-dark-muted: #7E7E8A;

  /* Hairline */
  --hairline: #E8E5DC;
  --hairline-strong: #D6D3C8;
  --hairline-on-dark: #24242E;

  /* AI3 brand gradient — hero 전용 */
  --grad-1: #FF5A1F;
  --grad-2: #E62CA0;
  --grad-3: #4151FF;
  --brand-gradient: linear-gradient(108deg, var(--grad-1) 0%, var(--grad-2) 48%, var(--grad-3) 100%);

  /* 제품 6색 인코딩 */
  --wrks: #2F4FFF;        --wrks-soft: #E5EAFF;
  --bizrouter: #7B3FE4;   --bizrouter-soft: #EFE6FF;
  --crew: #FF5A4D;        --crew-soft: #FFE5E2;
  --corepin: #D62E3E;     --corepin-soft: #FFE0E3;
  --onpod: #22C55E;       --onpod-soft: #DDFBE7;
  --memhub: #F59E0B;      --memhub-soft: #FFF1D6;

  /* 라디우스 */
  --r-xs: 4px; --r-sm: 8px; --r-md: 12px; --r-lg: 16px; --r-xl: 24px; --r-full: 9999px;

  /* 공간 */
  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px; --s-5: 20px; --s-6: 24px;
  --s-8: 32px; --s-10: 40px; --s-12: 48px; --s-14: 56px; --s-16: 64px; --s-20: 80px;
  --s-24: 96px;

  /* 폰트 */
  --f-display: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* 모션 */
  --ease: cubic-bezier(.22,.61,.36,1);
  --t-fast: 120ms; --t-base: 200ms; --t-slow: 360ms;

  /* 컨테이너 */
  --container: 1280px;
  --container-narrow: 880px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--f-display);
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 700; color: var(--ink); }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select { font-family: inherit; font-size: inherit; }

/* 타이포 ─────────────────────────────────────────────── */
.t-hero {
  font-size: clamp(36px, 5.6vw, 64px);
  line-height: 1.12;
  letter-spacing: -0.030em;
  font-weight: 700;
}
.t-display-xl {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.18;
  letter-spacing: -0.028em;
  font-weight: 700;
}
.t-display-lg {
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.22;
  letter-spacing: -0.025em;
  font-weight: 700;
}
.t-display-md {
  font-size: clamp(20px, 2.4vw, 24px);
  line-height: 1.28;
  letter-spacing: -0.020em;
  font-weight: 700;
}
.t-display-sm {
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: -0.015em;
  font-weight: 600;
}
.t-subtitle {
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.55;
  letter-spacing: -0.012em;
  font-weight: 500;
  color: var(--body);
}
.t-body {
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: -0.011em;
  color: var(--body);
}
.t-body-strong { font-weight: 600; color: var(--ink); }
.t-body-sm {
  font-size: 14px;
  line-height: 1.55;
  letter-spacing: -0.006em;
  color: var(--body);
}
.t-caption {
  font-size: 13px;
  line-height: 1.5;
  color: var(--body-soft);
}
.t-eyebrow {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--body-muted);
}

/* 레이아웃 ───────────────────────────────────────────── */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--s-6);
}
.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 var(--s-6);
}
.section { padding: var(--s-20) 0; }
.section-tight { padding: var(--s-12) 0; }
.section-dark {
  background: var(--canvas-dark);
  color: var(--on-dark);
}
.section-dark .t-eyebrow { color: var(--on-dark-muted); }
.section-dark .t-subtitle { color: var(--on-dark-soft); }
.section-dark .t-body { color: var(--on-dark-soft); }
.section-dim { background: var(--canvas-dim); }
.section-warm { background: var(--canvas-warm); }

.divider { height: 1px; background: var(--hairline); border: 0; margin: 0; }

/* 헤더 ───────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(255, 255, 255, .9);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--hairline);
}
.site-header.dark-mode {
  background: rgba(11, 11, 18, .85);
  border-bottom-color: var(--hairline-on-dark);
}
.site-header.dark-mode .nav-link,
.site-header.dark-mode .nav-logo,
.site-header.dark-mode .nav-hamb { color: var(--on-dark); }
.site-header.dark-mode .nav-link:hover { color: var(--on-dark-soft); }
.site-header.dark-mode .btn-secondary {
  background: var(--canvas-dark-elev);
  color: var(--on-dark);
  border-color: var(--hairline-on-dark);
}
.site-header.dark-mode .btn-secondary:hover { background: #2A2A36; }

.nav-wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--s-6);
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.025em;
  color: var(--ink);
  flex-shrink: 0;
}
.nav-logo .mark {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--brand-gradient);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--ink);
  position: relative;
  transition: color var(--t-fast) var(--ease);
}
.nav-link:hover { color: var(--body); }
.nav-link.active { color: var(--ink); }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -23px;
  height: 2px;
  background: var(--ink);
}
.site-header.dark-mode .nav-link.active::after { background: var(--on-dark); }

.nav-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}
.nav-hamb {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  background: var(--canvas);
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  padding: 0;
}
.nav-hamb span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  transition: all var(--t-fast) var(--ease);
}
.site-header.dark-mode .nav-hamb {
  background: var(--canvas-dark-elev);
  border-color: var(--hairline-on-dark);
}
.site-header.dark-mode .nav-hamb span { background: var(--on-dark); }

/* 모바일 메뉴 */
.mobile-menu {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--canvas);
  z-index: 89;
  padding: var(--s-6);
  overflow-y: auto;
}
.mobile-menu.open { display: block; }
.mobile-menu .nav-link {
  display: block;
  padding: 16px 0;
  font-size: 17px;
  border-bottom: 1px solid var(--hairline);
}
.mobile-menu .mobile-cta {
  margin-top: var(--s-6);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

@media (max-width: 1023px) {
  .nav-menu { display: none; }
  .nav-hamb { display: inline-flex; }
  .nav-actions .desktop-only { display: none; }
}

/* 버튼 ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  font-family: var(--f-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.011em;
  line-height: 1;
  cursor: pointer;
  transition: all var(--t-fast) var(--ease);
  text-decoration: none;
  white-space: nowrap;
  min-height: 44px;
}
.btn-primary {
  background: var(--ink);
  color: var(--on-dark);
}
.btn-primary:hover { background: var(--ink-strong); transform: translateY(-1px); }
.btn-secondary {
  background: var(--canvas);
  color: var(--ink);
  border-color: var(--hairline-strong);
}
.btn-secondary:hover { background: var(--canvas-dim); }
.btn-ghost-dark {
  background: var(--canvas-dark-elev);
  color: var(--on-dark);
  border-color: var(--hairline-on-dark);
}
.btn-ghost-dark:hover { background: #2A2A36; }
.btn-mint { background: #C8F6F9; color: var(--ink); }
.btn-sm { padding: 9px 14px; font-size: 13.5px; min-height: 36px; }
.btn-lg { padding: 14px 24px; font-size: 16px; }
.btn-block { width: 100%; justify-content: center; }
.btn-arrow::after {
  content: "→";
  font-weight: 400;
  transition: transform var(--t-fast) var(--ease);
}
.btn-arrow:hover::after { transform: translateX(3px); }

/* Hero ───────────────────────────────────────────────── */
.hero {
  background: var(--canvas-dark);
  color: var(--on-dark);
  padding: var(--s-24) 0 var(--s-20);
  position: relative;
  overflow: hidden;
}
.hero-grid-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(180deg, transparent 0%, black 30%, black 70%, transparent 100%);
}
.hero-inner {
  position: relative;
  z-index: 2;
}
.hero h1 { color: var(--on-dark); margin: 16px 0 24px; }
.hero h1 .grad-word {
  background: var(--brand-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p { color: var(--on-dark-soft); max-width: 640px; }
.hero-ctas {
  display: flex;
  gap: 12px;
  margin-top: var(--s-8);
  flex-wrap: wrap;
}
.eyebrow-strip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--on-dark-muted);
}
.eyebrow-strip .pip {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--grad-2);
}
.hero-ribbon {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background:
    radial-gradient(circle at 30% 30%, var(--grad-1) 0%, transparent 50%),
    radial-gradient(circle at 70% 40%, var(--grad-2) 0%, transparent 55%),
    radial-gradient(circle at 50% 75%, var(--grad-3) 0%, transparent 60%),
    var(--canvas-dark);
  filter: saturate(1.2) blur(1px);
  mask-image: radial-gradient(circle at 50% 50%, black 60%, transparent 100%);
  animation: ribbon-drift 18s var(--ease) infinite alternate;
}
.hero-ribbon::after {
  content: "";
  position: absolute;
  inset: 8%;
  border-radius: 50%;
  background: conic-gradient(from 140deg, transparent 0%, rgba(255,255,255,.04) 20%, transparent 40%, rgba(255,255,255,.06) 60%, transparent 80%);
  mix-blend-mode: screen;
  animation: ribbon-spin 32s linear infinite;
}
@keyframes ribbon-drift {
  0% { transform: translateY(-4px) rotate(0deg); }
  100% { transform: translateY(6px) rotate(8deg); }
}
@keyframes ribbon-spin { to { transform: rotate(360deg); } }

/* 섹션 헤더 ──────────────────────────────────────────── */
.s-head {
  max-width: 720px;
  margin-bottom: var(--s-12);
}
.s-head .t-eyebrow {
  display: inline-block;
  margin-bottom: 14px;
}
.s-head h2 { margin-bottom: 16px; }

/* Badge ──────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--canvas-dim);
  color: var(--ink);
  border: 1px solid var(--hairline);
}
.badge-new { background: #FFEAE5; color: #B5391C; border-color: #FFC9BB; }
.badge-live { background: #DDFBE7; color: #137B3A; border-color: #BCEFCC; }
.badge-beta { background: #E5EAFF; color: #2235A7; border-color: #BFC8FF; }
.badge-soon { background: #F5F1FF; color: #5A1FB4; border-color: #DCD0FF; }
.badge-wrks { background: var(--wrks-soft); color: var(--wrks); border-color: transparent; }
.badge-bizrouter { background: var(--bizrouter-soft); color: var(--bizrouter); border-color: transparent; }
.badge-crew { background: var(--crew-soft); color: var(--crew); border-color: transparent; }
.badge-corepin { background: var(--corepin-soft); color: var(--corepin); border-color: transparent; }
.badge-onpod { background: var(--onpod-soft); color: #137B3A; border-color: transparent; }
.badge-memhub { background: var(--memhub-soft); color: #A06400; border-color: transparent; }

/* 제품 카드 (vibrant) ─────────────────────────────────── */
.p-card {
  position: relative;
  border-radius: var(--r-xl);
  padding: var(--s-8);
  min-height: 280px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: white;
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--t-base) var(--ease);
  cursor: pointer;
}
.p-card:hover { transform: translateY(-4px); }
.p-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: radial-gradient(circle at 80% 0%, rgba(255,255,255,.18), transparent 50%);
}
.p-card::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background-image: radial-gradient(circle at 1px 1px, rgba(255,255,255,.08) 1px, transparent 0);
  background-size: 14px 14px;
  opacity: .6;
}
.p-card .p-eyebrow {
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,.78);
}
.p-card .p-title {
  font-size: clamp(24px, 2.8vw, 32px);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin-top: 12px;
}
.p-card .p-desc {
  margin-top: 12px;
  font-size: 14.5px;
  line-height: 1.55;
  opacity: 0.92;
}
.p-card .p-bottom {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-top: var(--s-6);
}
.p-card .p-cta {
  font-family: var(--f-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,.85);
}
.p-card .p-arrow {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,.16);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255,255,255,.22);
}
.p-wrks { background: var(--wrks); }
.p-bizrouter { background: var(--bizrouter); }
.p-crew { background: var(--crew); }
.p-corepin { background: var(--corepin); }
.p-onpod { background: var(--onpod); }
.p-memhub { background: var(--memhub); }

/* 문서·기능 카드 ─────────────────────────────────────── */
.f-card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: var(--s-6);
  transition: transform var(--t-base) var(--ease), border-color var(--t-base) var(--ease);
}
.f-card:hover { transform: translateY(-2px); border-color: var(--hairline-strong); }
.f-card h3 { margin: 14px 0 8px; }
.f-card .ix {
  width: 44px;
  height: 44px;
  border-radius: var(--r-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--f-mono);
  font-weight: 600;
  font-size: 18px;
  background: var(--canvas-dim);
  border: 1px solid var(--hairline);
}

/* Stat tiles ─────────────────────────────────────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--s-3);
}
.stat-tile {
  padding: var(--s-8);
  border-radius: var(--r-md);
  background: var(--canvas);
  border: 1px solid var(--hairline);
}
.stat-tile.tint-mint { background: var(--onpod-soft); border-color: #BCEFCC; }
.stat-tile.tint-coral { background: var(--crew-soft); border-color: #FFC7C0; }
.stat-tile.tint-cobalt { background: var(--wrks-soft); border-color: #BFC8FF; }
.stat-tile.tint-amber { background: var(--memhub-soft); border-color: #F0D89A; }
.stat-tile .num {
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--ink);
}
.stat-tile .label {
  font-family: var(--f-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 14px;
  color: var(--body);
}

/* 로고 row ───────────────────────────────────────────── */
.logo-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--s-10);
  padding: var(--s-8) 0;
}
.logo-row .logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--body-muted);
  letter-spacing: -0.02em;
  opacity: 0.7;
  font-style: italic;
}
.logo-row .logo:hover { opacity: 1; color: var(--body); }

/* Callout ────────────────────────────────────────────── */
.callout {
  background: var(--canvas-warm);
  border-left: 3px solid var(--ink);
  padding: var(--s-5) var(--s-6);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  font-size: 16px;
  line-height: 1.65;
  color: var(--ink);
}
.callout strong { color: var(--ink); font-weight: 600; }

/* Table ──────────────────────────────────────────────── */
.cmp-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
}
.cmp-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}
.cmp-table thead th {
  background: var(--canvas-dim);
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--body);
  text-align: left;
  padding: 14px 18px;
  border-bottom: 1px solid var(--hairline);
}
.cmp-table tbody td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--hairline);
  color: var(--body);
  vertical-align: top;
}
.cmp-table tbody td:first-child {
  color: var(--ink);
  font-weight: 600;
  font-family: var(--f-display);
}
.cmp-table tbody tr:last-child td { border-bottom: 0; }

/* Footer ─────────────────────────────────────────────── */
.site-footer {
  background: var(--canvas-dark);
  color: var(--on-dark);
  padding: var(--s-16) 0 var(--s-12);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(4, 1fr);
  gap: var(--s-8);
  padding-bottom: var(--s-10);
  border-bottom: 1px solid var(--hairline-on-dark);
}
.footer-grid h5 {
  font-family: var(--f-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--on-dark-muted);
  margin-bottom: 14px;
  font-weight: 500;
}
.footer-grid a {
  display: block;
  padding: 5px 0;
  color: var(--on-dark-soft);
  font-size: 14px;
}
.footer-grid a:hover { color: var(--on-dark); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--s-6);
  flex-wrap: wrap;
  gap: var(--s-4);
}
.footer-bottom .legal {
  font-size: 13px;
  color: var(--on-dark-muted);
}
.footer-bottom .legal a { color: var(--on-dark-soft); margin-left: var(--s-4); }
.footer-bottom .legal a:hover { color: var(--on-dark); text-decoration: underline; }
.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--s-3);
}
.footer-brand .nav-logo { color: var(--on-dark); }
.footer-brand p {
  font-size: 14px;
  color: var(--on-dark-soft);
  max-width: 320px;
  line-height: 1.6;
}

@media (max-width: 880px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 540px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* Wordmark banner (옵션, 홈 페이지 끝) ─────────────────── */
.wordmark-banner {
  background: var(--canvas);
  padding: var(--s-16) 0 var(--s-10);
  overflow: hidden;
}
.wordmark-banner .word {
  font-size: clamp(120px, 24vw, 380px);
  line-height: 0.84;
  font-weight: 700;
  letter-spacing: -0.045em;
  color: var(--hairline);
  text-align: center;
  user-select: none;
}

/* Form ───────────────────────────────────────────────── */
.form-field {
  display: block;
  margin-bottom: var(--s-5);
}
.form-field label {
  display: block;
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}
.form-field input,
.form-field textarea,
.form-field select {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-md);
  background: var(--canvas);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.5;
  transition: border-color var(--t-fast) var(--ease);
}
.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--ink);
  box-shadow: 0 0 0 3px rgba(14,14,18,.08);
}
.form-field textarea {
  min-height: 120px;
  resize: vertical;
}

/* Two-col helper ─────────────────────────────────────── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-8);
  align-items: start;
}
@media (max-width: 880px) {
  .two-col { grid-template-columns: 1fr; }
}

/* Three-col helper ───────────────────────────────────── */
.three-col {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
}
@media (max-width: 960px) { .three-col { grid-template-columns: 1fr 1fr; } }
@media (max-width: 580px) { .three-col { grid-template-columns: 1fr; } }

/* Two-col asymmetric for product hero */
.product-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: var(--s-12);
  align-items: center;
}
@media (max-width: 880px) {
  .product-hero-grid { grid-template-columns: 1fr; gap: var(--s-8); }
}

/* Anchor offset for sticky header */
section[id], h2[id], h3[id] { scroll-margin-top: 100px; }

/* Visually hidden (for a11y) */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* ── GNB 제품 메가 메뉴 ─────────────────────────────────── */
.nav-menu .has-mega {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}
.nav-menu .has-mega::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 100%;
  height: 18px; /* hover gap 안 끊기게 */
  background: transparent;
}
.nav-menu .mega {
  position: absolute;
  top: calc(100% + 16px);
  left: 50%;
  transform: translateX(-50%) translateY(-6px);
  opacity: 0;
  pointer-events: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px;
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: 10px;
  min-width: 640px;
  box-shadow: 0 24px 60px -20px rgba(14,14,18,.22), 0 4px 14px -4px rgba(14,14,18,.06);
  z-index: 95;
  transition: opacity var(--t-base) var(--ease), transform var(--t-base) var(--ease);
}
.nav-menu .has-mega:hover .mega,
.nav-menu .has-mega:focus-within .mega {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.nav-menu .mega-item {
  display: grid;
  grid-template-columns: 12px 1fr;
  gap: 14px;
  align-items: start;
  padding: 12px 14px;
  border-radius: var(--r-sm);
  text-decoration: none;
  color: var(--ink);
  transition: background var(--t-fast) var(--ease);
}
.nav-menu .mega-item:hover { background: var(--canvas-dim); }
.nav-menu .mega-item .m-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  margin-top: 7px;
}
.nav-menu .mega-item .m-ttl {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.018em;
  color: var(--ink);
}
.nav-menu .mega-item .m-cat {
  font-family: var(--f-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--body-muted);
  margin-top: 3px;
}
.nav-menu .mega-foot {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  margin-top: 4px;
  border-top: 1px solid var(--hairline);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  border-radius: 0 0 var(--r-sm) var(--r-sm);
}
.nav-menu .mega-foot:hover { background: var(--canvas-dim); }
.nav-menu .mega-foot .arrow { font-weight: 400; transition: transform var(--t-fast) var(--ease); }
.nav-menu .mega-foot:hover .arrow { transform: translateX(3px); }

/* 다크 모드 헤더 (홈 hero 위 등) */
.site-header.dark-mode .nav-menu .mega {
  background: var(--canvas-dark-soft);
  border-color: var(--hairline-on-dark);
  box-shadow: 0 24px 60px -20px rgba(0,0,0,.5);
}
.site-header.dark-mode .nav-menu .mega-item { color: var(--on-dark); }
.site-header.dark-mode .nav-menu .mega-item:hover { background: var(--canvas-dark-elev); }
.site-header.dark-mode .nav-menu .mega-item .m-ttl { color: var(--on-dark); }
.site-header.dark-mode .nav-menu .mega-item .m-cat { color: var(--on-dark-muted); }
.site-header.dark-mode .nav-menu .mega-foot {
  color: var(--on-dark);
  border-top-color: var(--hairline-on-dark);
}
.site-header.dark-mode .nav-menu .mega-foot:hover { background: var(--canvas-dark-elev); }

/* 모바일 메뉴 하위 — 펼친 형태 */
.mobile-menu .mobile-sub {
  margin: 4px 0 12px;
  padding: 4px 0 4px 12px;
  border-left: 2px solid var(--hairline);
  display: grid;
  gap: 2px;
}
.mobile-menu .mobile-sub-item {
  display: grid;
  grid-template-columns: 12px auto 1fr;
  gap: 10px;
  align-items: center;
  padding: 10px 12px;
  border-radius: var(--r-sm);
  font-size: 14.5px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 500;
}
.mobile-menu .mobile-sub-item:hover { background: var(--canvas-dim); }
.mobile-menu .mobile-sub-item .m-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}
.mobile-menu .mobile-sub-item .m-cat {
  font-family: var(--f-mono);
  font-size: 10.5px;
  color: var(--body-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-align: right;
}

@media (max-width: 720px) {
  .nav-menu .mega { min-width: 92vw; grid-template-columns: 1fr; }
}

/* ── 블로그 글 본문 ────────────────────────────────────── */
.post-hero {
  padding: var(--s-20) 0 var(--s-10);
  background: var(--canvas-warm);
  border-bottom: 1px solid var(--hairline);
}
.post-hero .eyebrow-strip { color: var(--body-muted); }
.post-hero .eyebrow-strip .pip { background: var(--ink); }
.post-hero h1 { color: var(--ink); margin: 16px 0 24px; }
.post-hero .lead {
  font-size: 20px; line-height: 1.55; letter-spacing: -0.012em;
  color: var(--body);
  max-width: 720px;
}
.post-meta {
  display: flex; gap: 14px; align-items: center;
  margin-top: var(--s-8); padding-top: var(--s-6);
  border-top: 1px solid var(--hairline-strong);
  font-size: 14px; color: var(--body);
  flex-wrap: wrap;
}
.post-meta .avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--brand-gradient);
  display: inline-flex; align-items: center; justify-content: center;
  color: white; font-family: var(--f-mono); font-size: 12px; font-weight: 600;
}
.post-meta .author { font-weight: 600; color: var(--ink); }
.post-meta .sep::before { content: "·"; color: var(--body-muted); margin: 0 4px; }
.post-meta a.share { color: var(--body); margin-left: auto; }
.post-meta a.share:hover { color: var(--ink); }

.post-body {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--s-12) var(--s-6) var(--s-20);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: -0.011em;
  color: var(--ink);
}
.post-body p { margin: 0 0 18px; }
.post-body h2 {
  margin: 56px 0 18px;
  font-size: 28px;
  letter-spacing: -0.025em;
  line-height: 1.3;
}
.post-body h3 {
  margin: 40px 0 14px;
  font-size: 21px;
  letter-spacing: -0.020em;
  line-height: 1.35;
}
.post-body ul, .post-body ol {
  padding-left: 20px;
  margin: 0 0 22px;
}
.post-body li { margin-bottom: 8px; }
.post-body strong { font-weight: 700; color: var(--ink); }
.post-body code {
  font-family: var(--f-mono); font-size: 14px;
  background: var(--canvas-dim);
  padding: 2px 7px; border-radius: 4px;
  border: 1px solid var(--hairline);
}
.post-body pre {
  background: var(--canvas-dark); color: #E2E2EA;
  padding: 22px;
  border-radius: var(--r-md);
  overflow-x: auto;
  font-family: var(--f-mono);
  font-size: 14px;
  line-height: 1.65;
  margin: 0 0 22px;
}
.post-body pre code { background: transparent; border: 0; padding: 0; color: inherit; font-size: inherit; }
.post-body blockquote {
  border-left: 3px solid var(--ink);
  background: var(--canvas-warm);
  padding: 16px 20px;
  margin: 0 0 22px;
  border-radius: 0 var(--r-md) var(--r-md) 0;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.65;
}
.post-body a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.post-body a:hover { color: var(--body-soft); }
.post-body table { width: 100%; border-collapse: collapse; margin: 0 0 22px; font-size: 15px; border: 1px solid var(--hairline); border-radius: var(--r-md); overflow: hidden; }
.post-body table th { background: var(--canvas-dim); padding: 10px 14px; text-align: left; font-weight: 600; border-bottom: 1px solid var(--hairline); font-size: 13px; }
.post-body table td { padding: 10px 14px; border-bottom: 1px solid var(--hairline); color: var(--body); }
.post-body table tr:last-child td { border-bottom: 0; }
.post-body figure { margin: 0 0 22px; }
.post-body figure img { border-radius: var(--r-md); }
.post-body figcaption { font-size: 13px; color: var(--body-soft); text-align: center; margin-top: 8px; }

.post-share-end {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--s-8) var(--s-6);
  border-top: 1px solid var(--hairline);
}

/* 다음 글 / 추천 */
.post-related {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--s-8) var(--s-6) var(--s-16);
}
.post-related h4 {
  font-family: var(--f-mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--body-muted); font-weight: 500;
  margin-bottom: 14px;
}

/* ── i18n 토글 (한국어 ↔ English) ─────────────────────── */
html[lang="ko"] .en-only,
html[lang="ko"] [data-i18n="en"] { display: none !important; }
html[lang="en"] .ko-only,
html[lang="en"] [data-i18n="ko"] { display: none !important; }

/* 영어 모드에선 한국어 letter-spacing이 너무 좁음 — 보정 */
html[lang="en"] body { letter-spacing: -0.008em; }
html[lang="en"] .t-hero,
html[lang="en"] .t-display-xl,
html[lang="en"] .t-display-lg,
html[lang="en"] .t-display-md { letter-spacing: -0.022em; }

/* 언어 스위처 */
.lang-switcher {
  display: inline-flex;
  align-items: center;
  background: var(--canvas-dim);
  border: 1px solid var(--hairline);
  border-radius: var(--r-sm);
  padding: 3px;
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
}
.lang-switcher button {
  background: transparent;
  border: 0;
  padding: 5px 10px;
  color: var(--body-soft);
  cursor: pointer;
  border-radius: 4px;
  text-transform: uppercase;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  letter-spacing: inherit;
}
html[lang="ko"] .lang-switcher button[data-set="ko"],
html[lang="en"] .lang-switcher button[data-set="en"] {
  background: var(--ink);
  color: var(--on-dark);
}
.site-header.dark-mode .lang-switcher {
  background: var(--canvas-dark-elev);
  border-color: var(--hairline-on-dark);
}
.site-header.dark-mode .lang-switcher button { color: var(--on-dark-muted); }
.site-header.dark-mode .lang-switcher button[data-set="ko"]:hover,
.site-header.dark-mode .lang-switcher button[data-set="en"]:hover { color: var(--on-dark); }
html[lang="ko"] .site-header.dark-mode .lang-switcher button[data-set="ko"],
html[lang="en"] .site-header.dark-mode .lang-switcher button[data-set="en"] {
  background: var(--canvas);
  color: var(--ink);
}