/* ==========================================================
   Megatelecom — Mega Menu (loaded after /css/style.css)
   - Desktop: hover/focus full-width panel
   - Mobile (≤768px): <details>/<summary> accordion (native)
   - Reuses style.css tokens (--primary, --text-main, --max-width)
   - Adds .nav-item / .nav-link / .nav-simple / .nav-mega-* classes
   ========================================================== */

/* ===== Reset .nav layout for nav-item containers ===== */
.nav {
  gap: 0;  /* override style.css's gap:4px — items have their own padding */
}

.nav-item {
  position: relative;
}

/* Top-level menu trigger anchor (was just .nav a previously) */
.nav-link,
.nav-simple {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-main);
  border-radius: 8px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}

.nav-link:hover,
.nav-link.active,
.nav-simple:hover,
.nav-simple.active {
  color: var(--primary);
  background: rgba(237, 28, 36, 0.06);
}

/* Caret indicator for items with a panel */
.nav-mega > .nav-link::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: 6px;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 4px solid currentColor;
  opacity: 0.55;
  transition: transform 0.2s, opacity 0.15s;
}

.nav-mega.is-open > .nav-link::after,
.nav-mega:hover > .nav-link::after {
  transform: rotate(180deg);
  opacity: 1;
}

/* ===== Full-width mega panel ===== */
.nav-mega-panel {
  position: fixed;
  top: 68px;                       /* sits below .header (height 68px) */
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);

  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;

  z-index: 990;                    /* below .header (1000) */
}

.nav-mega.is-open .nav-mega-panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-mega-panel-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 28px 20px 32px;
  display: grid;
  gap: 8px;
  /* Default: 4 columns (For Foreigners / 휴대폰) */
  grid-template-columns: repeat(4, 1fr);
}

/* Per-menu column overrides for the cleanest layout per item count */
.nav-mega[data-menu="business"] .nav-mega-panel-inner {
  /* 6 items → 3×2 grid */
  grid-template-columns: repeat(3, 1fr);
}
.nav-mega[data-menu="internet"] .nav-mega-panel-inner,
.nav-mega[data-menu="community"] .nav-mega-panel-inner {
  /* 3 items → single row of 3 */
  grid-template-columns: repeat(3, 1fr);
}
.nav-mega[data-menu="about"] .nav-mega-panel-inner {
  /* 2 items → left-aligned 2 columns, don't stretch */
  grid-template-columns: repeat(2, minmax(220px, 320px));
  justify-content: start;
}

/* Items inside the panel — override style.css's .nav a defaults */
.nav-mega-panel-inner a {
  display: block;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-main);
  border-radius: 10px;
  text-decoration: none;
  background: transparent;        /* override .nav a:hover background */
  transition: background 0.15s, color 0.15s;
  white-space: normal;
}

.nav-mega-panel-inner a:hover {
  background: rgba(237, 28, 36, 0.05);
  color: var(--text-main);
}

.nav-mega-item-title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-main);
  margin-bottom: 4px;
}

.nav-mega-panel-inner a:hover .nav-mega-item-title {
  color: var(--primary);
}

.nav-mega-item-desc {
  font-size: 12.5px;
  color: var(--text-sub);
  line-height: 1.5;
  font-weight: 400;
}

/* ===== Mobile (≤768px) ===== */
@media (max-width: 768px) {
  /* Hide mega panels on mobile */
  .nav-mega-panel {
    display: none;
  }
}

/* ===== Mobile nav accordion (replaces flat list) ===== */
/* Override style.css .mobile-nav a (display: block padding: 14px 16px) for sub-items
   by using more specific selectors. */

.mobile-nav-group {
  border-bottom: 1px solid #f0f0f0;
}

.mobile-nav-group > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
}

.mobile-nav-group > summary::-webkit-details-marker {
  display: none;
}

.mobile-nav-group > summary::after {
  content: '';
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 5px solid var(--text-sub);
  transition: transform 0.2s;
}

.mobile-nav-group[open] > summary::after {
  transform: rotate(180deg);
}

.mobile-nav-group > summary.active {
  color: var(--primary);
}

.mobile-nav-sub {
  padding: 4px 0 12px;
  background: var(--bg-light);
}

/* Override style.css .mobile-nav a default for sub-items */
.mobile-nav .mobile-nav-sub a {
  display: block;
  padding: 10px 16px 10px 32px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-sub);
  border-bottom: none;
}

.mobile-nav .mobile-nav-sub a:hover {
  color: var(--primary);
}

/* Flat link (사은품몰 in mobile) — keep style.css default but ensure consistency */
.mobile-nav-link {
  /* inherits .mobile-nav a styles from style.css */
}
.mobile-nav-link.active {
  color: var(--primary);
}

/* Utility section at the bottom (verify/mypage/login) */
.mobile-nav-utils {
  margin-top: 12px;
  padding-top: 8px;
  border-top: 2px solid #f0f0f0;
}

.mobile-nav-utils a {
  /* inherits .mobile-nav a from style.css */
  font-size: 15px;
  color: var(--text-main);
}

/* Body scroll lock when mobile menu is open */
body.mobile-nav-open {
  overflow: hidden;
}

/* ===== Backdrop dim when any mega panel is open (desktop) ===== */
.mega-backdrop {
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.18);
  z-index: 985;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.2s, visibility 0.2s;
}

.mega-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

@media (max-width: 768px) {
  .mega-backdrop {
    display: none;
  }
}