/* ==========================================================================
   GROUND TRUTH DS — base.css
   리셋 · 접근성 유틸 · 공통 레이아웃/컴포넌트 골격 (시안별 style.css에서 테마링)
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--fg, var(--color-ink-900));
  background: var(--bg, var(--color-white));
  word-break: keep-all;
  overflow-wrap: anywhere;
  -webkit-font-smoothing: antialiased;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
h1, h2, h3, h4, p, ul, ol, dl, dd, figure { margin: 0; }
ul[role="list"], ol[role="list"] { list-style: none; padding: 0; }
[hidden] { display: none !important; }

/* ---------- 접근성 ---------- */
.skip-link {
  position: absolute; left: var(--space-4); top: -100px; z-index: 999;
  padding: var(--space-3) var(--space-5); border-radius: var(--radius-sm);
  background: var(--color-ink-900); color: var(--color-white); font-weight: var(--fw-semibold);
}
.skip-link:focus { top: var(--space-4); }
.sr-only {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
:focus-visible { outline: 3px solid var(--focus, var(--color-info)); outline-offset: 3px; border-radius: 4px; }

/* ---------- 레이아웃 ---------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
.container--narrow { max-width: var(--container-narrow); }
section[id], [data-section] { scroll-margin-top: calc(var(--header-h) + 8px); }
.section { padding-block: var(--space-section); }

/* ---------- 공통 타이포 ---------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-mono); font-size: var(--fs-caption); letter-spacing: var(--ls-mono);
  text-transform: uppercase; font-weight: var(--fw-medium);
}
.mono { font-family: var(--font-mono); letter-spacing: 0.02em; }

/* ---------- 버튼 (D-17: 그린 버튼 = 잉크 텍스트) ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
  min-height: 48px; padding: 0 var(--space-6);
  border-radius: var(--btn-radius, var(--radius-pill));
  font-weight: var(--fw-semibold); font-size: 1rem; line-height: 1; white-space: nowrap;
  transition: background var(--dur-2) var(--ease-out), color var(--dur-2), border-color var(--dur-2), transform var(--dur-2) var(--ease-out), box-shadow var(--dur-2);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn--primary { background: var(--color-green-500); color: var(--color-ink-900); }
.btn--primary:hover { background: var(--color-green-400); box-shadow: 0 8px 24px rgba(85,183,101,.35); }
.btn--ink { background: var(--color-ink-900); color: var(--color-white); }
.btn--ink:hover { background: var(--color-ink-700); }
.btn--outline { border: 1.5px solid currentColor; }
.btn--sm { min-height: 40px; padding: 0 var(--space-4); font-size: var(--fs-small); }
.btn .arrow { transition: transform var(--dur-2) var(--ease-out); }
.btn:hover .arrow { transform: translateX(3px); }
.link-arrow { display: inline-flex; align-items: center; gap: 6px; font-weight: var(--fw-semibold); text-underline-offset: 4px; }
.link-arrow:hover { text-decoration: underline; }

/* ---------- 헤더 골격 ---------- */
.site-header { position: fixed; inset: 0 0 auto 0; z-index: var(--z-header); height: var(--header-h); transition: background var(--dur-3), box-shadow var(--dur-3), color var(--dur-3); }
.site-header .bar { height: 100%; display: flex; align-items: center; gap: var(--space-6); }
.brand { display: flex; align-items: center; gap: var(--space-3); flex-shrink: 0; }
.brand img { height: 34px; width: auto; }
.gnb { margin-left: auto; }
.gnb ul { display: flex; gap: clamp(var(--space-4), 1.6vw, var(--space-8)); list-style: none; padding: 0; margin: 0; }
.gnb a { position: relative; display: block; padding-block: var(--space-2); font-size: 0.9375rem; font-weight: var(--fw-medium); white-space: nowrap; }
.gnb a::after { content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 2px; background: var(--color-green-500); transform: scaleX(0); transform-origin: left; transition: transform var(--dur-2) var(--ease-out); }
.gnb a:hover::after, .gnb a[aria-current="true"]::after { transform: scaleX(1); }
.utility { display: flex; align-items: center; gap: var(--space-3); }
.utility .lang { font-family: var(--font-mono); font-size: var(--fs-caption); letter-spacing: var(--ls-mono); opacity: .8; }
.menu-toggle { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; border-radius: var(--radius-sm); }
.menu-toggle span, .menu-toggle span::before, .menu-toggle span::after { display: block; width: 22px; height: 2px; background: currentColor; border-radius: 2px; position: relative; transition: transform var(--dur-2), opacity var(--dur-2); }
.menu-toggle span::before, .menu-toggle span::after { content: ""; position: absolute; left: 0; }
.menu-toggle span::before { top: -7px; } .menu-toggle span::after { top: 7px; }
.menu-toggle[aria-expanded="true"] span { background: transparent; }
.menu-toggle[aria-expanded="true"] span::before { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span::after { transform: translateY(-7px) rotate(-45deg); }

/* 모바일 드로어 (D-22) */
.drawer {
  position: fixed; inset: 0; z-index: var(--z-drawer); display: flex; flex-direction: column;
  padding: calc(var(--header-h) + var(--space-4)) var(--gutter) var(--space-8);
  background: var(--color-ink-900); color: var(--color-white);
  transform: translateY(-100%); visibility: hidden; transition: transform var(--dur-3) var(--ease-out), visibility 0s linear var(--dur-3);
}
.drawer.is-open { transform: none; visibility: visible; transition: transform var(--dur-3) var(--ease-out); }
.drawer .drawer-cta { display: grid; gap: var(--space-3); margin-bottom: var(--space-8); }
.drawer ul { list-style: none; padding: 0; margin: 0; }
.drawer li + li { border-top: 1px solid rgba(255,255,255,.1); }
.drawer ul a { display: flex; justify-content: space-between; align-items: center; padding: var(--space-4) 0; font-size: 1.375rem; font-weight: var(--fw-bold); }
.drawer ul a .mono { font-size: var(--fs-caption); color: var(--color-gray-400); font-weight: 400; }
.drawer .drawer-foot { margin-top: auto; font-size: var(--fs-small); color: var(--color-gray-400); }
body.drawer-open { overflow: hidden; }

@media (max-width: 1100px) {
  .gnb, .utility .hide-tablet { display: none; }
  .menu-toggle { display: inline-flex; }
  .utility { margin-left: auto; }
}
@media (max-width: 520px) { .utility .hide-mobile { display: none; } }

/* ---------- 슬라이드쇼 (Ken Burns, D-04/D-21) ---------- */
.kb { position: absolute; inset: 0; overflow: hidden; }
.kb > img, .kb > picture, .kb > video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0; transition: opacity 1.4s var(--ease-in-out); }
.kb > img.is-active, .kb > picture.is-active { opacity: 1; animation: kenburns var(--dur-kenburns) ease-out both; }
.kb > img:nth-child(2n).is-active { animation-name: kenburns-alt; }
@keyframes kenburns { from { transform: scale(1) translate(0,0); } to { transform: scale(1.08) translate(-1.5%, -1%); } }
@keyframes kenburns-alt { from { transform: scale(1.08) translate(1.5%, 0); } to { transform: scale(1) translate(0,0); } }
.kb-pause { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; border-radius: 50%; border: 1px solid currentColor; }
.kb-pause svg { width: 14px; height: 14px; }

/* ---------- 리빌 (스캔라인) ---------- */
[data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity var(--dur-4) var(--ease-out), transform var(--dur-4) var(--ease-out); }
[data-reveal].is-visible { opacity: 1; transform: none; }
[data-reveal="scan"] { opacity: 1; transform: none; clip-path: inset(0 0 100% 0); transition: clip-path 1.1s var(--ease-out); }
[data-reveal="scan"].is-visible { clip-path: inset(0 0 0 0); }
@media (prefers-reduced-motion: reduce) {
  [data-reveal], [data-reveal="scan"] { opacity: 1; transform: none; clip-path: none; transition: none; }
  .kb > img.is-active { animation: none; }
}
.no-js [data-reveal] { opacity: 1; transform: none; clip-path: none; }

/* ---------- 탭 (제품) ---------- */
[role="tablist"] { display: flex; gap: var(--space-2); overflow-x: auto; scrollbar-width: none; }
[role="tablist"]::-webkit-scrollbar { display: none; }
[role="tab"] { white-space: nowrap; }
[role="tabpanel"][hidden] { display: none; }

/* ---------- 로고 벽 ---------- */
.logo-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: var(--space-3); list-style: none; padding: 0; margin: 0; }
.logo-grid > li, .partner-grid > li, .stat-cards > li, .prod-grid > li, .bento > *, .proof-list > li { min-width: 0; }
.logo-grid li { background: var(--color-white); border-radius: var(--radius-sm); display: grid; place-items: center; aspect-ratio: 158 / 64; padding: var(--space-2); }
.logo-grid img { width: 100%; height: 100%; object-fit: contain; filter: grayscale(1) contrast(1.05); opacity: .78; transition: filter var(--dur-3), opacity var(--dur-3); }
.logo-grid li:hover img, .logo-grid li:focus-within img { filter: none; opacity: 1; }
.logo-grid li.is-hidden { display: none; }

/* ---------- 폼 ---------- */
.field { display: grid; gap: var(--space-2); }
.field label, .field legend { font-size: var(--fs-small); font-weight: var(--fw-semibold); }
.field .req { color: var(--color-danger); margin-left: 2px; }
.input { width: 100%; min-height: 48px; padding: var(--space-3) var(--space-4); border-radius: var(--radius-sm); border: 1.5px solid var(--input-border, var(--color-gray-300)); background: var(--input-bg, var(--color-white)); color: var(--input-fg, var(--color-ink-900)); }
textarea.input { min-height: 120px; resize: vertical; }
.input:focus { outline: none; border-color: var(--color-info); box-shadow: 0 0 0 3px rgba(31,111,235,.25); }
.chips { display: flex; flex-wrap: wrap; gap: var(--space-2); border: 0; padding: 0; margin: 0; }
.chips input { position: absolute; opacity: 0; pointer-events: none; }
.chips label { display: inline-flex; align-items: center; min-height: 40px; padding: 0 var(--space-4); border-radius: var(--radius-pill); border: 1.5px solid var(--input-border, var(--color-gray-300)); font-weight: var(--fw-medium); cursor: pointer; transition: all var(--dur-2); }
.chips input:checked + label { background: var(--color-green-500); border-color: var(--color-green-500); color: var(--color-ink-900); }
.chips input:focus-visible + label { outline: 3px solid var(--color-info); outline-offset: 2px; }
.consent { display: flex; gap: var(--space-3); align-items: flex-start; font-size: var(--fs-small); }
.consent input { width: 20px; height: 20px; margin-top: 2px; accent-color: var(--color-green-700); }
.form-status { min-height: 1.5em; font-weight: var(--fw-semibold); }

/* ---------- 연혁 펼치기 ---------- */
details.history-all summary { cursor: pointer; list-style: none; display: inline-flex; align-items: center; gap: var(--space-2); font-weight: var(--fw-semibold); }
details.history-all summary::-webkit-details-marker { display: none; }
details.history-all summary::after { content: "+"; font-family: var(--font-mono); }
details.history-all[open] summary::after { content: "−"; }

/* ---------- 시안 스위처 (프로토타입 전용) ---------- */
.draft-switcher {
  position: fixed; right: 16px; bottom: 16px; z-index: 400; display: flex; gap: 4px; padding: 4px;
  border-radius: var(--radius-pill); background: rgba(6,13,20,.88); backdrop-filter: blur(8px);
  box-shadow: var(--shadow-3); font-family: var(--font-mono); font-size: 12px;
}
.draft-switcher a { white-space: nowrap; color: #fff; padding: 8px 12px; border-radius: var(--radius-pill); opacity: .7; }
.draft-switcher a[aria-current="page"] { background: var(--color-green-500); color: var(--color-ink-900); opacity: 1; font-weight: 700; }
.draft-switcher a:hover { opacity: 1; }
@media (max-width: 520px) {
  .draft-switcher { left: 8px; right: 8px; bottom: 8px; justify-content: space-between; font-size: 11px; }
  .draft-switcher a { padding: 8px 10px; }
}