/* =========================================================
   layout.css — header, footer, sub-hero, sub-nav, grid helpers
   ========================================================= */

/* ============ Grid helpers ============ */
.grid { display: grid; gap: var(--sp-5); }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
.grid-4 { grid-template-columns: 1fr; }

@media (min-width: 641px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1025px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.flex-split {
  display: grid;
  gap: var(--sp-7);
}
@media (min-width: 1025px) {
  .flex-split { grid-template-columns: 1fr 1fr; }
  .flex-split--55 { grid-template-columns: 55fr 45fr; }
  .flex-split--60 { grid-template-columns: 60fr 40fr; }
  .flex-split--45 { grid-template-columns: 45fr 55fr; }
}

/* Section */
.section {
  padding: var(--section-py-mobile) 0;
}
@media (min-width: 1025px) {
  .section { padding: var(--section-py-desktop) 0; }
}
.section--alt { background: var(--bg-section); }
.section--dark { background: var(--bg-dark); color: var(--text-invert); }
.section--dark h1, .section--dark h2, .section--dark h3 { color: #fff; }
.section--dark .section-desc { color: rgba(255,255,255,.7); }

/* ============ HEADER ============ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 80px;
  z-index: var(--z-header);
  background: transparent;
  transition:
    background var(--dur-base) var(--ease-out),
    height var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out);
}

/* scrolled (any page not at top) */
body.is-scrolled .site-header {
  height: 64px;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-1);
}

/* dark hero transparent header (top of main page) */
body:not(.is-scrolled) .site-header.on-dark .gnb-link { color: #fff; }
body:not(.is-scrolled) .site-header.on-dark .hamburger span { background: #fff; }

/* hide on scroll down */
body.is-scroll-down .site-header {
  transform: translateY(-100%);
}

.site-header > .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-5);
}

/* --- logo --- */
.brand-logo {
  display: inline-flex;
  align-items: center;
  line-height: 1;
}
.brand-logo .brand-img {
  height: 48px;
  width: auto;
  display: block;
  transition: height var(--dur-base) var(--ease-out);
}
body.is-scrolled .brand-logo .brand-img { height: 40px; }
@media (max-width: 640px) {
  .brand-logo .brand-img { height: 40px; }
  body.is-scrolled .brand-logo .brand-img { height: 34px; }
}

/* --- GNB --- */
.gnb {
  display: none;
  align-items: center;
  gap: var(--sp-5);
}
@media (min-width: 1025px) {
  .gnb { display: flex; }
}
.gnb-item {
  position: relative;
  /* 헤더 높이만큼 확장 → 트리거 클릭 영역과 메뉴 진입 사이 호버 갭 제거.
     COMPANY (.gnb-sub top:100%) 와 PRODUCTS (.gnb-sub--mega top:80px) 가
     같은 y에서 시작하도록 정렬됨. */
  height: 80px;
  display: flex;
  align-items: center;
}
body.is-scrolled .gnb-item { height: 64px; }
.gnb-link {
  display: inline-block;
  padding: 8px 0;
  font-size: 15px;
  font-weight: var(--fw-medium);
  letter-spacing: 0.03em;
  color: var(--text-strong);
  position: relative;
}
.gnb-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  height: 2px;
  width: 0;
  background: var(--accent);
  transition: width var(--dur-base) var(--ease-out);
}
.gnb-item:hover .gnb-link::after,
.gnb-item.is-active .gnb-link::after { width: 100%; }

.gnb-sub {
  position: absolute;
  left: 50%;
  top: 100%;
  transform: translateX(-50%) translateY(-8px);
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-2);
  padding: 12px;
  padding-top: 24px;
  min-width: 180px;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out);
}
.gnb-item:hover .gnb-sub,
.gnb-item:focus-within .gnb-sub {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}
.gnb-sub a {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: var(--fw-medium);
  color: var(--text-body);
  border-radius: var(--radius-xs);
  white-space: nowrap;
  transition: all var(--dur-fast) var(--ease-out);
}
.gnb-sub a:hover {
  background: var(--bg-section);
  color: var(--color-primary-700);
}

/* --- Mega menu (.gnb-sub--mega) ----------------------------------
   1100px 폭이라 PRODUCTS 트리거 중앙에 두면 우측이 잘림 →
   position: fixed로 뷰포트 중앙에 고정. 헤더 높이(80px)에서 시작.
   .gnb-item:hover 트리거는 DOM 부모 관계라 position 변경에도 그대로 동작.
*/
.gnb-sub.gnb-sub--mega {
  position: fixed;
  left: 50%;
  top: 80px;
  transform: translateX(-50%) translateY(-8px);
  width: min(1100px, 92vw);
  min-width: 0;
  padding: 28px 32px 22px;
  padding-top: 28px;
  border-radius: var(--radius-lg, 16px);
  /* 갈색톤 hero 위에 떠있을 때 따뜻하게 보이도록 brown-tinted shadow */
  box-shadow:
    0 28px 56px -16px rgba(107, 68, 35, 0.22),
    0 12px 24px -8px rgba(107, 68, 35, 0.14);
}
.gnb-item:hover .gnb-sub.gnb-sub--mega,
.gnb-item:focus-within .gnb-sub.gnb-sub--mega {
  transform: translateX(-50%) translateY(0);
}
/* 스크롤 시 헤더가 64px로 줄어들 때 메뉴도 따라 올라감 */
body.is-scrolled .gnb-sub.gnb-sub--mega { top: 64px; }
/* 호버 안전 마진 — gnb-item이 80px 풀 높이라 갭은 없지만 fractional pixel 보정 */
.gnb-sub.gnb-sub--mega::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -4px;
  height: 4px;
  background: transparent;
}
.gnb-mega__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.gnb-mega__col {
  border-left: 1px solid rgba(107, 68, 35, 0.10);
  padding-left: 20px;
}
.gnb-mega__col:first-child {
  border-left: 0;
  padding-left: 0;
}
.gnb-mega__cat {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--ff-display, inherit);
  font-size: 11px;
  font-weight: var(--fw-bold, 700);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 14px;
  white-space: nowrap;
}
.gnb-mega__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
}
/* 카테고리 컬러: BITOPLUS 바이컬러(brown + green) 팔레트로 통일.
   네트워크/아이덴티티 = 갈색 두 톤, 옵저버빌리티/클라우드 = 녹색 두 톤. */
.gnb-mega__col--net  .gnb-mega__cat { color: var(--color-primary-700, #6b4423); }
.gnb-mega__col--net  .gnb-mega__dot { background: var(--color-primary-700, #6b4423); }
.gnb-mega__col--id   .gnb-mega__cat { color: var(--color-primary-500, #8d6e4b); }
.gnb-mega__col--id   .gnb-mega__dot { background: var(--color-primary-500, #8d6e4b); }
.gnb-mega__col--obs  .gnb-mega__cat { color: var(--color-accent-600, #5a8f3c); }
.gnb-mega__col--obs  .gnb-mega__dot { background: var(--color-accent-600, #5a8f3c); }
.gnb-mega__col--cn   .gnb-mega__cat { color: var(--color-accent-500, #6fa84c); }
.gnb-mega__col--cn   .gnb-mega__dot { background: var(--color-accent-500, #6fa84c); }
.gnb-mega__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.gnb-sub.gnb-sub--mega .gnb-mega__list a {
  display: block;
  padding: 8px 10px;
  border-radius: 8px;
  white-space: normal;
  transition: background var(--dur-fast, 150ms) var(--ease-out);
}
.gnb-sub.gnb-sub--mega .gnb-mega__list a:hover {
  background: var(--color-neutral-50, #faf8f5);
}
.gnb-sub.gnb-sub--mega .gnb-mega__list a:hover .gnb-mega__name {
  color: var(--color-primary-700, #6b4423);
}
.gnb-mega__name {
  display: block;
  font-size: 13.5px;
  font-weight: var(--fw-bold, 700);
  letter-spacing: 0.02em;
  color: var(--text-strong);
  line-height: 1.3;
  margin-bottom: 2px;
}
.gnb-mega__desc {
  display: block;
  font-size: 11.5px;
  color: var(--text-muted);
  line-height: 1.4;
  font-weight: var(--fw-regular, 400);
}
.gnb-mega__foot {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(107, 68, 35, 0.10);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 12.5px;
  color: var(--text-muted);
}
.gnb-mega__foot strong {
  color: var(--text-strong);
}
.gnb-sub.gnb-sub--mega .gnb-mega__foot a.gnb-mega__cta {
  color: var(--color-primary-700, #6b4423);
  font-weight: var(--fw-bold, 700);
  font-size: 12.5px;
  padding: 6px 0;
  background: transparent;
  border-radius: 0;
  white-space: nowrap;
}
.gnb-sub.gnb-sub--mega .gnb-mega__foot a.gnb-mega__cta::after {
  content: " →";
}
.gnb-sub.gnb-sub--mega .gnb-mega__foot a.gnb-mega__cta:hover {
  color: var(--color-primary-800, #4e2f16);
  background: transparent;
}

/* Tablet — collapse to 2 cols when viewport too narrow */
@media (max-width: 1100px) {
  .gnb-sub.gnb-sub--mega {
    width: min(720px, 92vw);
  }
  .gnb-mega__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px 24px;
  }
  .gnb-mega__col {
    border-left: 0;
    padding-left: 0;
  }
}

/* --- Hamburger --- */
.hamburger {
  display: inline-flex;
  width: 40px; height: 40px;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: calc(var(--z-overlay) + 1);
}
.hamburger span {
  position: absolute;
  left: 10px;
  width: 20px; height: 2px;
  background: var(--text-strong);
  border-radius: 2px;
  transition:
    transform var(--dur-base) var(--ease-out),
    top var(--dur-base) var(--ease-out),
    opacity var(--dur-fast) linear,
    background var(--dur-base) var(--ease-out);
}
.hamburger span:nth-child(1) { top: 13px; }
.hamburger span:nth-child(2) { top: 19px; }
.hamburger span:nth-child(3) { top: 25px; }

body.menu-open .hamburger span { background: #fff; }
body.menu-open .hamburger span:nth-child(1) { top: 19px; transform: rotate(45deg); }
body.menu-open .hamburger span:nth-child(2) { opacity: 0; }
body.menu-open .hamburger span:nth-child(3) { top: 19px; transform: rotate(-45deg); }

@media (min-width: 1025px) {
  .hamburger { display: none; }
}

/* --- Mobile full-screen menu --- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: var(--bg-dark);
  color: #fff;
  transform: translateX(100%);
  transition: transform var(--dur-slow) var(--ease-out);
  overflow-y: auto;
  padding: 80px var(--container-px-mobile) var(--sp-8);
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

body.menu-open .mobile-menu { transform: none; }

.mobile-menu-item { border-bottom: 1px solid rgba(255,255,255,.08); }
.mobile-menu-item > a,
.mobile-menu-item > button.m-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 18px 0;
  font-size: 20px;
  font-weight: var(--fw-semibold);
  color: #fff;
  background: transparent;
  border: 0;
  text-align: left;
  cursor: pointer;
}
.mobile-menu-item > button.m-toggle .chev {
  transition: transform var(--dur-base) var(--ease-out);
}
.mobile-menu-item.is-open > button.m-toggle .chev { transform: rotate(180deg); }

.mobile-menu-sub {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--dur-slow) var(--ease-out);
}
.mobile-menu-item.is-open .mobile-menu-sub { max-height: 400px; }
.mobile-menu-sub a {
  display: block;
  padding: 12px 0 12px var(--sp-4);
  font-size: 15px;
  color: rgba(255,255,255,.7);
}
.mobile-menu-sub a:hover,
.mobile-menu-sub a.is-active { color: var(--color-accent-300); }

@media (min-width: 1025px) {
  .mobile-menu { display: none; }
}

/* Body lock while menu open */
body.menu-open { overflow: hidden; }

/* ============ SUB HERO (sub page header banner) ============ */
.sub-hero {
  position: relative;
  margin-top: 0;
  padding: calc(80px + var(--sp-8)) 0 var(--sp-8);
  min-height: 320px;
  background:
    linear-gradient(135deg, rgba(21,19,15,.88) 0%, rgba(75,46,21,.72) 100%),
    var(--bg-dark);
  color: #fff;
  overflow: hidden;
  display: flex;
  align-items: center;
}
.sub-hero::after {
  content: attr(data-monogram);
  position: absolute;
  right: -40px;
  bottom: -80px;
  font-family: var(--ff-display);
  font-weight: 700;
  font-size: 360px;
  line-height: 1;
  color: rgba(255,255,255,.04);
  pointer-events: none;
  user-select: none;
}
.sub-hero.sub-hero--center { text-align: center; }
.sub-hero.sub-hero--center .sub-hero-inner { margin: 0 auto; align-items: center; }

.sub-hero-inner {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  max-width: 720px;
  align-items: flex-start;
  position: relative;
  z-index: 1;
}

.breadcrumb {
  display: flex;
  gap: var(--sp-2);
  font-size: var(--fs-caption);
  color: rgba(255,255,255,.7);
  align-items: center;
}
.breadcrumb a:hover { color: #fff; }
.breadcrumb .sep { opacity: .5; }

.sub-hero h1 {
  color: #fff;
  font-size: var(--fs-h1);
  letter-spacing: -0.02em;
  line-height: var(--lh-tight);
}
.sub-hero .sub-hero-desc {
  color: rgba(255,255,255,.75);
  font-size: var(--fs-body-lg);
  line-height: var(--lh-loose);
  max-width: 580px;
}

@media (min-width: 1025px) {
  .sub-hero {
    padding: calc(80px + var(--sp-9)) 0 var(--sp-9);
    min-height: 360px;
  }
}

/* ============ SUB NAV (sticky second-level menu) ============
   Supports either a single .sub-nav-inner row (most subpages) or
   multiple .sub-nav-row wrappers for vendor pages with product lines
   (e.g. CISCO → Firepower / Duo / SSE / Workload / Vision).

   Backwards compatible: pages using the old structure
     .sub-nav > .container.sub-nav-inner
   still render correctly because .sub-nav itself is white. New pages use
     .sub-nav > .sub-nav-row > .container.sub-nav-inner
   so the row wrapper can paint a full-width tint behind .container. */
.sub-nav {
  position: sticky;
  top: 64px;
  z-index: var(--z-sticky);
  background: #fff;
  border-bottom: 1px solid var(--border-soft);
  min-height: 56px;
  transition: transform var(--dur-base) var(--ease-out);
  will-change: transform;
}
/* Hide-on-scroll-down / show-on-scroll-up (classes set by header.js) */
body.is-scroll-down .sub-nav { transform: translateY(-110%); }
body.is-scrolled .sub-nav { box-shadow: var(--shadow-1); }

/* Full-width row wrapper (only used when stacking 2+ rows — rare after v2 refactor) */
.sub-nav-row { width: 100%; }
.sub-nav-row--secondary { /* legacy no-op, kept for backwards compat */ }

.sub-nav-inner {
  min-height: 56px;
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding-top: 8px;
  padding-bottom: 8px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.sub-nav-inner::-webkit-scrollbar { display: none; }

/* 모바일에서 sub-nav-tabs가 한 줄에 다 안 들어갈 때, 우측 페이드 그림자로
   "더 있어요" 시각 인디케이터 제공. 가로 스크롤은 이미 동작. */
@media (max-width: 768px) {
  .sub-nav { position: sticky; }  /* override: sticky는 ::after 컨텍스트로도 작동 */
  .sub-nav::after {
    content: "";
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 36px;
    background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.95) 70%);
    pointer-events: none;
    z-index: 2;
  }
}

/* Category label (PRODUCTS / LINE / SUPPORT / POLICY) — hidden by design
   but kept in markup for semantic/accessibility backwards compatibility. */
.sub-nav-title {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.sub-nav-tabs {
  display: flex;
  gap: 6px;
  align-items: center;
}

/* Pill-style tab */
.sub-nav-tab {
  display: inline-flex;
  align-items: center;
  padding: 9px 18px;
  font-size: 14px;
  font-weight: var(--fw-medium);
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  font-family: inherit;
  text-decoration: none;
  transition:
    background-color var(--dur-base) var(--ease-out),
    color var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out);
}
.sub-nav-tab:hover {
  background: var(--color-neutral-50);
  color: var(--text-strong);
}
.sub-nav-tab.is-active,
.sub-nav-tab[aria-selected="true"] {
  background: var(--color-primary-700);
  color: #fff;
  font-weight: var(--fw-semibold);
}
.sub-nav-tab:focus-visible {
  outline: 2px solid var(--color-accent-500);
  outline-offset: 2px;
}

/* ============ CONTENT BLOCK (subpage inside) ============ */
/* All sections share the white page background. Visual rhythm is created by
   section-head (eyebrow + h2 + underline), card borders/shadows, and spacing,
   not by alternating background fills. */
.content-block {
  padding: var(--sp-8) 0;
}
.content-block + .content-block { padding-top: 0; }
.content-block--alt {
  /* kept as a no-op modifier so existing markup keeps working;
     visual separation comes from the inner cards, not the section bg. */
  background: transparent;
}
@media (min-width: 1025px) {
  .content-block { padding: var(--sp-9) 0; }
}

/* ============ FOOTER ============ */
.site-footer {
  background: var(--color-neutral-900);
  color: rgba(255,255,255,.72);
  padding: var(--sp-8) 0 var(--sp-5);
  font-size: var(--fs-body-sm);
  margin-top: var(--sp-9);
}
.footer-grid {
  display: grid;
  gap: var(--sp-7);
  grid-template-columns: 1fr;
  padding-bottom: var(--sp-7);
  border-bottom: 1px solid rgba(255,255,255,.08);
}
@media (min-width: 1025px) {
  .footer-grid {
    grid-template-columns: 1.4fr 2fr 1.3fr;
  }
}

.footer-brand { display: flex; flex-direction: column; gap: var(--sp-4); }
.footer-brand .footer-logo {
  display: inline-flex;
  align-items: center;
  font-family: var(--ff-display);
  font-weight: 800;
  color: #fff;
  font-size: 20px;
  letter-spacing: 0.04em;
}
.footer-tagline {
  color: rgba(255,255,255,.6);
  font-size: var(--fs-body-sm);
  line-height: var(--lh-loose);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-5);
}
@media (min-width: 641px) {
  .footer-nav { grid-template-columns: repeat(4, 1fr); }
}
.footer-nav h6 {
  color: #fff;
  font-family: var(--ff-display);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: var(--sp-3);
  font-weight: var(--fw-semibold);
}
.footer-nav ul { display: flex; flex-direction: column; gap: 8px; }
.footer-nav a {
  color: rgba(255,255,255,.6);
  font-size: 13px;
  transition: color var(--dur-fast) var(--ease-out);
}
.footer-nav a:hover { color: var(--color-accent-300); }

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  color: rgba(255,255,255,.6);
  font-size: 13px;
  line-height: var(--lh-loose);
}
.footer-contact .label {
  font-family: var(--ff-display);
  font-size: 11px;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,.5);
  margin-right: var(--sp-2);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-3);
  padding-top: var(--sp-5);
  font-size: var(--fs-caption);
  color: rgba(255,255,255,.5);
}
.footer-bottom .footer-links {
  display: flex;
  gap: var(--sp-4);
}
.footer-bottom .footer-links a:hover { color: #fff; }

/* spacing relief when mobile tabbar is present */
@media (max-width: 1024px) {
  .site-footer { padding-bottom: calc(var(--sp-5) + 64px); margin-bottom: 0; }
}