/* 네비게이션 - 글래스모피즘 */
.nav {
    background: rgba(254,252,249,0.85);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--nav-height);
}
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--nav-height);
}
.nav-logo {
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}
.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-5);
    list-style: none;
}
.nav-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
    padding: var(--space-2) 0;
    position: relative;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
    transform: scaleX(0);
    transition: transform var(--transition-base);
}
.nav-link:hover {
    color: var(--color-primary);
}
.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
}
.nav-link.active {
    color: var(--color-primary);
}
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
    cursor: pointer;
}
.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* 구분선 - 네비 링크와 인증/CTA 영역 분리 */
.nav-divider {
    width: 1px;
    height: 20px;
    background: var(--color-border);
    margin: 0 var(--space-1);
    flex-shrink: 0;
}

/* 인증 영역 */
.nav-auth {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}
.nav-auth-link {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}
.nav-auth-link:hover {
    color: var(--color-primary);
    background: var(--color-primary-50);
}
.nav-auth-link.nav-auth-register {
    color: var(--color-primary);
    font-weight: 600;
}
.nav-auth-link.nav-auth-register:hover {
    background: var(--color-primary-100);
}

/* CTA 버튼 */
.nav-cta {
    margin-left: var(--space-1);
}

/* 사용자 드롭다운 */
.nav-user {
    position: relative;
}
.nav-user-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-lg);
    transition: background var(--transition-fast);
    font-family: inherit;
    color: var(--color-text);
}
.nav-user-btn:hover {
    background: var(--color-bg-light);
}
.nav-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    font-weight: 700;
    flex-shrink: 0;
}
.nav-user-name {
    font-size: var(--font-size-sm);
    font-weight: 500;
    max-width: 80px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.nav-chevron {
    transition: transform var(--transition-fast);
    color: var(--color-text-secondary);
}
.nav-user.open .nav-chevron {
    transform: rotate(180deg);
}

/* 드롭다운 메뉴 */
.nav-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + var(--space-2));
    right: 0;
    min-width: 180px;
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    padding: var(--space-2);
    z-index: 200;
    animation: dropdownIn 0.15s ease-out;
}
.nav-user.open .nav-dropdown {
    display: block;
}
@keyframes dropdownIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}
.nav-dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-text);
    transition: background var(--transition-fast);
}
.nav-dropdown-item:hover {
    background: var(--color-bg-light);
    color: var(--color-primary);
}
.nav-dropdown-item svg {
    color: var(--color-text-secondary);
    flex-shrink: 0;
}
.nav-dropdown-item:hover svg {
    color: var(--color-primary);
}
.nav-dropdown-divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--space-2) var(--space-3);
}

/* 모바일 유저 메뉴 (데스크톱에서 숨김) */
.nav-user-mobile { display: none; }
.show-mobile-only { display: none; }

@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .nav-menu {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: rgba(254,252,249,0.98);
        -webkit-backdrop-filter: blur(12px);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: var(--space-3);
        border-bottom: 1px solid var(--color-border);
        gap: 0;
    }
    .nav-menu.active { display: flex; }
    .nav-link {
        padding: 14px var(--space-4);
        display: block;
        border-radius: var(--radius-md);
    }
    .nav-link:hover {
        background: var(--color-bg-light);
    }
    .nav-link::after { display: none; }
    .nav-menu .btn {
        margin-top: var(--space-2);
        width: 100%;
    }
    /* 모바일: 구분선 → 가로 구분선 */
    .nav-divider {
        width: 100%;
        height: 1px;
        margin: var(--space-2) 0;
    }
    /* 모바일: 데스크톱 드롭다운 숨기고 직접 메뉴 표시 */
    .nav-user { display: none; }
    .nav-user-mobile.show-mobile-only { display: block; }
    /* 모바일: 인증 영역 세로 배치 */
    .nav-auth {
        flex-direction: column;
        width: 100%;
        gap: 0;
        margin-top: 0;
    }
    .nav-auth-link {
        padding: 14px var(--space-4);
        display: block;
        border-radius: var(--radius-md);
        width: 100%;
        text-align: center;
    }
    .nav-auth-link:hover {
        background: var(--color-bg-light);
    }
    /* 모바일: CTA 풀 너비 */
    .nav-cta {
        margin-left: 0;
        width: 100%;
    }
    .nav-cta .btn {
        width: 100%;
        margin-top: var(--space-2);
    }
}