/* =====================================================
   Navigation - 신경근재활필라테스협회
   ===================================================== */

/* ── 헤더 기본 ── */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    height: var(--nav-height);
    transition: background var(--duration-base) var(--ease-smooth),
                box-shadow var(--duration-base) var(--ease-smooth);
}

.site-header .navbar {
    height: 100%;
    padding: 0;
    background: transparent;
}

/* 항상 다크 헤더 */
.site-header {
    background: rgba(42,42,42,0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* 스크롤 시 헤더 — 동일 다크 유지 */
.site-header.scrolled {
    background: rgba(42,42,42,0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 20px rgba(0,0,0,0.3);
}

/* 내비 링크·로고는 항상 white */
.site-header .navbar-nav .nav-link,
.site-header .site-logo {
    color: var(--color-white);
}

.site-header.scrolled .navbar-nav .nav-link,
.site-header.scrolled .site-logo {
    color: var(--color-white);
}

/* ── 로고 ── */
.site-logo {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
    transition: opacity var(--duration-fast) var(--ease-smooth);
}

.site-logo:hover { opacity: 0.8; color: inherit; }

.logo-text-ko {
    font-size: var(--fs-sm);
    font-weight: 700;
    letter-spacing: -0.01em;
    font-family: var(--font-heading);
}

.logo-text-en {
    font-size: 0.65rem;
    letter-spacing: 0.08em;
    font-family: var(--font-accent);
    opacity: 0.7;
    text-transform: uppercase;
}

/* ── 내비 링크 ── */
.navbar-nav .nav-link {
    font-size: var(--fs-sm);
    font-weight: 500;
    padding: 0.5rem 0.75rem !important;
    position: relative;
    transition: color var(--duration-fast) var(--ease-smooth);
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0.75rem; right: 0.75rem;
    height: 1.5px;
    background: var(--color-accent);
    transform: scaleX(0);
    transition: transform var(--duration-fast) var(--ease-cinematic);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    transform: scaleX(1);
}

.navbar-nav .nav-link:hover { color: var(--color-accent) !important; }

/* ── CTA 버튼 (내비) ── */
.btn-nav-cta {
    padding: 0.5rem 1.25rem;
    font-size: var(--fs-sm);
    font-weight: 600;
    color: var(--color-white) !important;
    background-color: var(--color-accent);
    border-radius: var(--radius-sm);
    letter-spacing: 0.03em;
    transition: all var(--duration-fast) var(--ease-smooth);
}

.btn-nav-cta:hover {
    background-color: var(--color-accent-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-gold);
}

/* ── 메가 드롭다운 ── */
.mega-dropdown { position: relative; }

.mega-menu {
    min-width: 180px;
    background: var(--color-white);
    border: none;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 0.5rem 0;
    margin-top: 0.5rem;
    border-top: 3px solid var(--color-accent);
    animation: fadeDown 0.2s var(--ease-cinematic);
}

@keyframes fadeDown {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.mega-menu .dropdown-item {
    font-size: var(--fs-sm);
    color: var(--color-text);
    padding: 0.6rem 1.25rem;
    transition: all var(--duration-fast) var(--ease-smooth);
    position: relative;
}

.mega-menu .dropdown-item::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 3px;
    background: var(--color-accent);
    transform: scaleY(0);
    transition: transform var(--duration-fast) var(--ease-cinematic);
}

.mega-menu .dropdown-item:hover {
    background: rgba(201,169,110,0.06);
    color: var(--color-accent);
    padding-left: 1.5rem;
}

.mega-menu .dropdown-item:hover::before { transform: scaleY(1); }

/* ── 햄버거 버튼 ── */
.hamburger-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1100;
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: all var(--duration-base) var(--ease-cinematic);
}

.hamburger-btn.active .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.hamburger-btn.active .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.hamburger-btn.active .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ── 모바일 풀스크린 오버레이 ── */
.mobile-nav-overlay {
    position: fixed;
    inset: 0;
    background: var(--color-primary);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration-slow) var(--ease-cinematic);
}

.mobile-nav-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.mobile-nav-close {
    position: absolute;
    top: 1.5rem; right: 1.5rem;
    background: transparent;
    border: none;
    color: var(--color-white);
    font-size: 2.5rem;
    line-height: 1;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity var(--duration-fast) var(--ease-smooth);
}

.mobile-nav-close:hover { opacity: 1; }

.mobile-nav-inner { width: 100%; padding: 2rem; }

.mobile-nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.mobile-nav-group {
    display: block;
    color: var(--color-accent);
    font-size: var(--fs-xs);
    letter-spacing: 0.12em;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    font-family: var(--font-accent);
}

.mobile-nav-sub {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.mobile-nav-sub a {
    color: var(--color-white);
    font-size: var(--fs-lg);
    font-weight: 500;
    opacity: 0.85;
    transition: opacity var(--duration-fast) var(--ease-smooth);
}

.mobile-nav-sub a:hover { opacity: 1; color: var(--color-accent); }

.mobile-nav-link-direct,
.mobile-nav-cta {
    display: block;
    font-size: var(--fs-xl);
    font-weight: 700;
    color: var(--color-white) !important;
}

.mobile-nav-cta {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: var(--color-accent);
    border-radius: var(--radius-sm);
    margin-top: 0.5rem;
}

/* ── 반응형 ── */
@media (max-width: 991px) {
    .hamburger-btn { display: flex; }

    .site-header:not(.scrolled) .hamburger-btn { color: var(--color-white); }
    .site-header.scrolled .hamburger-btn { color: var(--color-white); }

    .navbar-collapse { display: none !important; }
}

/* 페이지 본문 상단 여백 (고정 헤더 만큼) */
main > *:first-child:not(.hero-section) { padding-top: var(--nav-height); }