/* ════════════════════════════════════════════════════════════
   KTradeHub Design System v1
   ──────────────────────────────────────────────────────────────
   • Type:    나눔스퀘어네오 (Nanum Square Neo)
   • Brand:   Trade Green (#00A651)
   • Mood:    각진 미니멀, 모노크롬 + 단색 액센트, 정보밀도 중심
   • Tokens:  --kth-{category}-{variant}
   ════════════════════════════════════════════════════════════ */

:root {
  /* ── Color: Brand ────────────────────────── */
  --kth-brand:        #00A651;   /* Trade Green */
  --kth-brand-dk:     #008C45;
  --kth-brand-lt:     #33B973;
  --kth-brand-bg:     #E8F5EE;   /* tint */

  /* ── Color: Neutral ──────────────────────── */
  --kth-black:        #0E0F12;
  --kth-ink:          #1A1D22;   /* heading */
  --kth-text:         #2A2D33;   /* body */
  --kth-text-2:       #4D525A;   /* sub */
  --kth-muted:        #767C85;   /* caption */
  --kth-line:         #E5E7EA;   /* hairline */
  --kth-line-2:       #D7DADD;   /* stronger */
  --kth-surface:      #FFFFFF;   /* card bg */
  --kth-surface-2:    #F7F8F9;   /* page-bg accent */
  --kth-bg:           #FFFFFF;   /* page bg (white) */

  /* ── Color: Semantic ─────────────────────── */
  --kth-success:      #00A651;
  --kth-warning:      #E69100;
  --kth-danger:       #D8403B;
  --kth-info:         #2B6FB0;

  /* ── Color: Dark surface (deep green tones — no navy) ── */
  --kth-dark-1:       #0A2418;   /* near-black green */
  --kth-dark-2:       #0F3526;   /* deep green */
  --kth-dark-3:       #1B4A33;   /* mid dark green */

  /* ── Typography ──────────────────────────── */
  --kth-font:         'Nanum Square Neo', 'NanumSquareNeo', 'Pretendard', 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  --kth-font-num:     'Nanum Square Neo', 'Inter', system-ui, sans-serif;

  --kth-fs-xs:        12px;     /* 캡션/배지 */
  --kth-fs-sm:        13px;     /* 라벨 */
  --kth-fs-md:        15px;     /* 본문 */
  --kth-fs-lg:        18px;
  --kth-fs-xl:        22px;     /* h3 */
  --kth-fs-2xl:       28px;     /* h2 */
  --kth-fs-3xl:       40px;     /* h1 */
  --kth-fs-4xl:       56px;     /* hero */

  --kth-lh-tight:     1.2;
  --kth-lh-normal:    1.55;
  --kth-lh-loose:     1.75;

  --kth-fw-regular:   400;
  --kth-fw-bold:      700;
  --kth-fw-heavy:     800;

  --kth-tracking-tight: -0.02em;
  --kth-tracking-wide:  0.08em;

  /* ── Spacing (4-base) ─────────────────────── */
  --kth-sp-0: 0;
  --kth-sp-1: 4px;
  --kth-sp-2: 8px;
  --kth-sp-3: 12px;
  --kth-sp-4: 16px;
  --kth-sp-5: 24px;
  --kth-sp-6: 32px;
  --kth-sp-7: 48px;
  --kth-sp-8: 64px;
  --kth-sp-9: 96px;
  --kth-sp-10: 120px;

  /* ── Layout ──────────────────────────────── */
  --kth-container:    1200px;
  --kth-container-wide: 1400px;

  /* ── Border / Radius / Shadow ────────────── */
  --kth-border:       1px solid var(--kth-line);
  --kth-border-2:     1px solid var(--kth-line-2);
  --kth-border-dark:  1px solid var(--kth-dark-3);

  --kth-radius:       0;        /* 전부 각진 */
  --kth-radius-sm:    0;

  --kth-shadow-1:     0 1px 0 rgba(14,15,18,0.04);
  --kth-shadow-2:     0 2px 8px rgba(14,15,18,0.06);
  --kth-shadow-3:     0 8px 24px rgba(14,15,18,0.10);

  /* ── Motion ──────────────────────────────── */
  --kth-ease:         cubic-bezier(.2, .7, .2, 1);
  --kth-fast:         120ms var(--kth-ease);
  --kth-slow:         240ms var(--kth-ease);

  /* ── Z-index ─────────────────────────────── */
  --kth-z-header:     100;
  --kth-z-modal:      900;
  --kth-z-toast:      950;
}

/* ── Base reset ──────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--kth-font);
  font-size: var(--kth-fs-md);
  line-height: var(--kth-lh-normal);
  color: var(--kth-text);
  background: var(--kth-bg);
  word-break: keep-all;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img, svg { display: block; max-width: 100%; }
button { font-family: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }

/* ── Headings ────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--kth-font);
  font-weight: var(--kth-fw-heavy);
  color: var(--kth-ink);
  line-height: var(--kth-lh-tight);
  letter-spacing: var(--kth-tracking-tight);
}
h1 { font-size: var(--kth-fs-3xl); }
h2 { font-size: var(--kth-fs-2xl); }
h3 { font-size: var(--kth-fs-xl); }
h4 { font-size: var(--kth-fs-lg); }
p  { margin: 0; }

/* ════════════════════════════════════════════════════════════
   Layout primitives
   ════════════════════════════════════════════════════════════ */
.kth-container { max-width: var(--kth-container); margin: 0 auto; padding: 0 var(--kth-sp-5); }
.kth-container--wide { max-width: var(--kth-container-wide); }

.kth-section { padding: var(--kth-sp-9) 0; }
.kth-section--tight { padding: var(--kth-sp-7) 0; }
.kth-section--alt { background: var(--kth-surface-2); }
.kth-section--dark {
  background: linear-gradient(135deg, var(--kth-dark-1) 0%, var(--kth-dark-2) 100%);
  color: #fff;
}
.kth-section--dark h1, .kth-section--dark h2, .kth-section--dark h3, .kth-section--dark h4 { color: #fff; }
.kth-section--dark p, .kth-section--dark .kth-text-2 { color: rgba(255,255,255,0.78); }
.kth-section--brand {
  background: linear-gradient(135deg, var(--kth-brand) 0%, var(--kth-brand-dk) 100%);
  color: #fff;
}
.kth-section--brand h1, .kth-section--brand h2 { color: #fff; }
.kth-section--brand p { color: rgba(255,255,255,0.92); }

/* Grid utility */
.kth-grid { display: grid; gap: var(--kth-sp-5); }
.kth-grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.kth-grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.kth-grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.kth-grid-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

@media (max-width: 992px) {
  .kth-grid-3, .kth-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .kth-grid-6 { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 600px) {
  .kth-grid-2, .kth-grid-3, .kth-grid-4, .kth-grid-6 { grid-template-columns: 1fr; }
}

.kth-stack > * + * { margin-top: var(--kth-sp-4); }
.kth-stack-sm > * + * { margin-top: var(--kth-sp-2); }
.kth-stack-lg > * + * { margin-top: var(--kth-sp-6); }

/* ════════════════════════════════════════════════════════════
   Section meta (label + title + desc)
   ════════════════════════════════════════════════════════════ */
.kth-eyebrow {
  display: inline-block;
  font-size: var(--kth-fs-xs);
  font-weight: var(--kth-fw-bold);
  letter-spacing: var(--kth-tracking-wide);
  text-transform: uppercase;
  color: var(--kth-brand-dk);
  margin-bottom: var(--kth-sp-3);
}
.kth-section--dark .kth-eyebrow,
.kth-section--brand .kth-eyebrow { color: rgba(255,255,255,0.7); }

.kth-title { font-size: var(--kth-fs-2xl); margin-bottom: var(--kth-sp-3); }
.kth-title--lg { font-size: var(--kth-fs-3xl); }
.kth-title--xl { font-size: var(--kth-fs-4xl); }

.kth-lead {
  font-size: var(--kth-fs-lg);
  line-height: var(--kth-lh-loose);
  color: var(--kth-text-2);
}
.kth-section--dark .kth-lead,
.kth-section--brand .kth-lead { color: rgba(255,255,255,0.85); }

/* ════════════════════════════════════════════════════════════
   Card
   ════════════════════════════════════════════════════════════ */
.kth-card {
  background: var(--kth-surface);
  border: var(--kth-border);
  padding: var(--kth-sp-5);
  transition: transform var(--kth-fast), box-shadow var(--kth-fast), border-color var(--kth-fast);
}
.kth-card--hover:hover { box-shadow: var(--kth-shadow-3); transform: translateY(-2px); border-color: var(--kth-line-2); }
.kth-card--ink { background: var(--kth-dark-3); border-color: rgba(255,255,255,0.08); color: rgba(255,255,255,0.9); }
.kth-card--brand { background: var(--kth-brand-bg); border-color: rgba(0,166,81,0.18); }

.kth-card__icon {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--kth-sp-3);
  color: var(--kth-brand);
  border: var(--kth-border-2);
  background: var(--kth-surface);
}
.kth-section--dark .kth-card__icon { color: var(--kth-brand-lt); border-color: rgba(255,255,255,0.18); background: rgba(255,255,255,0.04); }
.kth-card__title { font-size: var(--kth-fs-lg); margin-bottom: var(--kth-sp-2); }
.kth-card__text  { color: var(--kth-text-2); font-size: var(--kth-fs-sm); line-height: var(--kth-lh-loose); }

/* ════════════════════════════════════════════════════════════
   Buttons
   ════════════════════════════════════════════════════════════ */
.kth-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px;
  min-height: 44px;
  font-family: var(--kth-font);
  font-size: var(--kth-fs-md);
  font-weight: var(--kth-fw-bold);
  letter-spacing: 0;
  text-decoration: none;
  border: 2px solid transparent;
  background: transparent;
  color: var(--kth-ink);
  transition: background var(--kth-fast), color var(--kth-fast), border-color var(--kth-fast), transform var(--kth-fast);
  cursor: pointer;
}
.kth-btn:active { transform: translateY(1px); }

.kth-btn--primary { background: var(--kth-brand-dk); color: #fff; }
.kth-btn--primary:hover { background: var(--kth-brand); }

.kth-btn--ink { background: var(--kth-ink); color: #fff; }
.kth-btn--ink:hover { background: var(--kth-black); }

.kth-btn--outline { border-color: var(--kth-ink); color: var(--kth-ink); }
.kth-btn--outline:hover { background: var(--kth-ink); color: #fff; }

.kth-btn--ghost { color: var(--kth-text); }
.kth-btn--ghost:hover { background: var(--kth-surface-2); }

/* on dark surfaces */
.kth-section--dark .kth-btn--outline,
.kth-section--brand .kth-btn--outline { border-color: #fff; color: #fff; }
.kth-section--dark .kth-btn--outline:hover,
.kth-section--brand .kth-btn--outline:hover { background: #fff; color: var(--kth-ink); }
.kth-section--brand .kth-btn--primary { background: #fff; color: var(--kth-brand-dk); }
.kth-section--brand .kth-btn--primary:hover { background: rgba(255,255,255,0.92); }

.kth-btn--sm { padding: 8px 14px; min-height: 36px; font-size: var(--kth-fs-sm); }
.kth-btn--lg { padding: 16px 28px; min-height: 52px; font-size: var(--kth-fs-lg); }
.kth-btn--block { display: flex; width: 100%; }

/* ════════════════════════════════════════════════════════════
   Badge / Tag
   ════════════════════════════════════════════════════════════ */
.kth-badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 8px;
  font-size: var(--kth-fs-xs);
  font-weight: var(--kth-fw-bold);
  background: var(--kth-surface-2);
  color: var(--kth-text);
  border: var(--kth-border);
}
.kth-badge--brand { background: var(--kth-brand-bg); color: var(--kth-brand-dk); border-color: transparent; }
.kth-badge--ink { background: var(--kth-ink); color: #fff; border-color: var(--kth-ink); }
.kth-badge--success { background: var(--kth-brand-bg); color: var(--kth-brand-dk); }
.kth-badge--warning { background: #FEF6E1; color: var(--kth-warning); }
.kth-badge--danger  { background: #FBE7E6; color: var(--kth-danger); }

/* ════════════════════════════════════════════════════════════
   Form
   ════════════════════════════════════════════════════════════ */
.kth-input, .kth-select, .kth-textarea {
  display: block;
  width: 100%;
  padding: 12px 14px;
  min-height: 44px;
  font-family: var(--kth-font);
  font-size: var(--kth-fs-md);
  color: var(--kth-ink);
  background: var(--kth-surface);
  border: var(--kth-border-2);
  transition: border-color var(--kth-fast), box-shadow var(--kth-fast);
}
.kth-input:focus, .kth-select:focus, .kth-textarea:focus {
  outline: none;
  border-color: var(--kth-brand);
  box-shadow: 0 0 0 3px rgba(0,166,81,0.15);
}
.kth-textarea { min-height: 120px; resize: vertical; line-height: var(--kth-lh-loose); }

.kth-label {
  display: block;
  font-size: var(--kth-fs-sm);
  font-weight: var(--kth-fw-bold);
  color: var(--kth-ink);
  margin-bottom: var(--kth-sp-2);
}
.kth-hint { font-size: var(--kth-fs-xs); color: var(--kth-muted); margin-top: var(--kth-sp-1); }

/* ════════════════════════════════════════════════════════════
   Icon (svg, currentColor)
   ════════════════════════════════════════════════════════════ */
.kth-icon { width: 24px; height: 24px; stroke: currentColor; fill: none; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.kth-icon--sm { width: 16px; height: 16px; stroke-width: 1.7; }
.kth-icon--lg { width: 32px; height: 32px; stroke-width: 1.5; }
.kth-icon--xl { width: 44px; height: 44px; stroke-width: 1.4; }

/* ════════════════════════════════════════════════════════════
   Utility
   ════════════════════════════════════════════════════════════ */
.kth-text-center { text-align: center; }
.kth-text-muted  { color: var(--kth-muted); }
.kth-text-2      { color: var(--kth-text-2); }
.kth-text-brand  { color: var(--kth-brand-dk); }
.kth-divider     { border: 0; border-top: var(--kth-border); margin: var(--kth-sp-7) 0; }

/* ════════════════════════════════════════════════════════════
   Product grid (catalog)
   ════════════════════════════════════════════════════════════ */
.kth-product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--kth-sp-5);
}
.kth-product-card {
  display: block;
  background: var(--kth-surface);
  border: var(--kth-border);
  text-decoration: none;
  color: inherit;
  transition: border-color var(--kth-fast), transform var(--kth-fast);
}
.kth-product-card:hover { border-color: var(--kth-line-2); transform: translateY(-2px); }
.kth-product-card__img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  background: var(--kth-surface-2);
  padding: var(--kth-sp-3);
  border-bottom: var(--kth-border);
}
.kth-product-card__img-empty {
  width: 100%; aspect-ratio: 1;
  background: var(--kth-surface-2);
  display: flex; align-items: center; justify-content: center;
  color: var(--kth-muted); font-size: var(--kth-fs-xs);
  border-bottom: var(--kth-border);
}
.kth-product-card__body { padding: var(--kth-sp-3); }
.kth-product-card__code {
  display: inline-block;
  background: var(--kth-ink);
  color: #fff;
  font-size: 10px;
  font-weight: var(--kth-fw-bold);
  padding: 2px 7px;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}
.kth-product-card__series { font-size: 11px; color: var(--kth-muted); margin-bottom: 2px; }
.kth-product-card__name { font-size: var(--kth-fs-sm); font-weight: var(--kth-fw-bold); line-height: 1.4; margin-bottom: 6px; color: var(--kth-ink); }
.kth-product-card__price { font-size: var(--kth-fs-md); font-weight: var(--kth-fw-heavy); color: var(--kth-danger); margin-bottom: 4px; }
.kth-product-card__price small { font-size: 11px; font-weight: var(--kth-fw-regular); color: var(--kth-muted); }
.kth-product-card__meta { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; margin-top: 4px; }

/* Filter / search bar — 한 행에 가능한 모든 컨트롤 */
.kth-filter-bar {
  display: flex;
  gap: var(--kth-sp-2);
  flex-wrap: wrap;
  align-items: stretch;
  background: var(--kth-surface);
  border: var(--kth-border);
  padding: var(--kth-sp-3) var(--kth-sp-4);
  margin-bottom: var(--kth-sp-4);
}
.kth-filter-bar .kth-input,
.kth-filter-bar .kth-select {
  min-height: 40px;
  padding: 8px 12px;
}
.kth-filter-bar .kth-input  { flex: 1 1 240px; min-width: 200px; }
.kth-filter-bar .kth-select { flex: 0 1 160px; min-width: 140px; }
.kth-filter-bar .kth-btn    { flex: 0 0 auto; min-height: 40px; }

.kth-cat-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: var(--kth-sp-4); }
.kth-cat-tab {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px;
  border: var(--kth-border-2);
  background: var(--kth-surface);
  color: var(--kth-text-2);
  font-size: var(--kth-fs-sm);
  font-weight: var(--kth-fw-bold);
  text-decoration: none;
  transition: border-color var(--kth-fast), color var(--kth-fast), background var(--kth-fast);
}
.kth-cat-tab:hover { border-color: var(--kth-ink); color: var(--kth-ink); }
.kth-cat-tab.active { background: var(--kth-ink); color: #fff; border-color: var(--kth-ink); }
.kth-cat-tab__cnt { font-size: 11px; opacity: 0.6; }

/* Pagination */
.kth-pagination { display: flex; gap: 4px; flex-wrap: wrap; justify-content: center; margin-top: var(--kth-sp-7); }
.kth-pagination a, .kth-pagination span {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 38px; min-height: 38px;
  padding: 0 12px;
  border: var(--kth-border);
  background: var(--kth-surface);
  color: var(--kth-text);
  font-size: var(--kth-fs-sm);
  text-decoration: none;
}
.kth-pagination a:hover { background: var(--kth-surface-2); }
.kth-pagination .active { background: var(--kth-ink); color: #fff; border-color: var(--kth-ink); }

/* Spec table */
.kth-spec-table { width: 100%; border-collapse: collapse; font-size: var(--kth-fs-md); }
.kth-spec-table th, .kth-spec-table td { padding: 12px 14px; text-align: left; border-bottom: var(--kth-border); vertical-align: top; }
.kth-spec-table th { width: 120px; color: var(--kth-muted); font-weight: var(--kth-fw-bold); background: var(--kth-surface-2); }
.kth-spec-table tr:last-child th, .kth-spec-table tr:last-child td { border-bottom: none; }

/* Page header (used in containers-shop hero-style banner)
   첫번째 요소면 fixed header 높이만큼 추가 패딩 */
.kth-page-header {
  background: var(--kth-surface-2);
  border-bottom: var(--kth-border);
  padding: var(--kth-sp-7) 0;
  margin-bottom: var(--kth-sp-6);
}
main > .kth-page-header:first-child {
  padding-top: calc(108px + var(--kth-sp-6));
}
/* page-header 없이 시작하는 콘텐츠 페이지 */
main > .kth-container:first-child {
  padding-top: calc(108px + var(--kth-sp-5));
}
.kth-page-header__eyebrow { font-size: var(--kth-fs-xs); font-weight: var(--kth-fw-bold); color: var(--kth-brand-dk); letter-spacing: var(--kth-tracking-wide); text-transform: uppercase; margin-bottom: var(--kth-sp-2); }
.kth-page-header__title { font-size: var(--kth-fs-2xl); margin-bottom: var(--kth-sp-2); }
.kth-page-header__desc { font-size: var(--kth-fs-md); color: var(--kth-text-2); }

/* ════════════════════════════════════════════════════════════
   Responsive type ratio
   ════════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  :root {
    --kth-fs-2xl: 24px;
    --kth-fs-3xl: 32px;
    --kth-fs-4xl: 40px;
    --kth-sp-9: 64px;
    --kth-sp-10: 80px;
  }
}